GB/T 1220—2007ICS 77. 140. 20 H 40 GB National Standard of the People’s Republic of China GB/T 1220—2007 In place of GB/T 1220—1992 _______________________________________________________________________________ Stainless Steel Bars 不锈钢棒 Issued on 14-05-2007 implemented on 01-12-2007 By General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China and Standardization Administration Committee of the People's Republic of China 1 GB/T 1220—2007 Forward This Standard is to be implemented in place of GB/T 1220—1992: Stainless steel bars. In comparison with Standard GB/T 1220—1992, the alterations of this Standard include the following points: It has added “Technical terms and definitions” and “Contents in order sheet” (See Chapter 3 and Chapter 4 hereof); “Dimensions, contour, weight and permissible deviation” is changed to direct quotation of stipulations specified in universal basic standard (Chapter 4 of 1992 edition; Chapter 6 of this edition); It has cancelled 6 grades, including 1Cr18Mn10Ni5Mo3N, 1Cr18Mn12Mo2Ti, 0Cr18Ni12Mo2Ti, 1Cr18Ni5Mo12Mo3Ti, 1Cr18Ni9Ti and 0Cr26Ni5Mo2, etc (Table 2 and Table 3 of 1992 Edition); It has added 6 grades and their properties, in including 022Cr18Mn22Ni5Mo3N, 022Cr23Ni5Mo3N, 022Cr25Ni6Mo2N, 03Cr25Ni6Mo3Cu2N, 17Cr16Ni2 and 05Cr15Ni5Cu4Nb, etc (See Table 2 and Table 7, Table 4 and Table 9, Table 5 and Table 10 hereof); It has adjusted the chemical compositions and phosphonium content of 21 steel grades (serial numbers: 1, 3, 13, 17, 23, 25, 35, 38, 39, 41, 43, 44, 52, 55, 62, 68, 93, 85, 98, 137 and 139) based on universal international steel grade (Table 2 in 1992 Edition and Tables 1 ~ 5 in this Edition); It has modified “Smelting method” that it shall apply initial molten steel plus out-of-furnace refining process in priority (Article 5.2 of 1992 edition and Article 7.2 of this edition); “Delivery state” is changed from “It may not be treated if it is required by the Buyer” into “It may not be treated through negotiations between the Supplier and the Buyer”, while for precipitation-hardening stainless steel bars it has added that annealing treatment to the delivery can be chosen by steel texture (Article 5.3 of 1992 edition and Article 7.3 of this edition); For “Surface quality” it has added that “It may specify to remove scales formed from heat treatment by way of pickling, turning or other methods through negotiations between the Supplier and the Buyer, which should be indicated in contract” (Article 7.8.3 of this edition); The heat treatment system for all kinds of stainless steel bars or test pieces is separated from mechanical property table and listed into Appendix A (Informative appendix) (Table 3 ~ Table 5 of 1992 edition; Table A.1 ~ Table A.5 of this edition); The yield strength for martensite and precipitation-hardening stainless steel is changed to necessary inspection indicator (Article 5.4.1.1 of 1992 edition; Table 9 and Table 10 of this edition); For 022Cr19Ni5Mo3Si2N(00Cr18Ni5Mo3Si2) steel, it has added that Brinell hardness value HBW shall be no more than 290 (Table 3 of 1992 edition; Table 7 of this edition); For 12Cr13(1Cr13) steel it has added that the lower limit of carbon content shall be 0.08%, while its percentage elongation after fracture is adjusted from 25% to 22% (Table 2 and Table 4 of 1992 edition; Table 4 and Table 9 of this edition); 1 GB/T 1220—2007 For 30Cr13(Y3Cr13) steel, its percentage elongation after fracture is adjusted from 12% and 40% to 8% and 35% (Table 4 of 1992 edition; Table 9 of this edition); The original yield strength σ0.2 value for some martensite steels (No. 18, 22, 26, 39, 46, 50 and 52) and 06Cr13Al(0Cr13Al) is adjusted from 177Mpa to proof strength at non-proportional extension RP0.2 value to be 175 N/mm2 (Table 3 of 1992 edition; Table 6 and Table 8 of this edition); The yield strength σ0.2 value for 022Cr12(00Cr12) steels is adjusted from 196MPa to proof strength at non-proportional extension RP0.2 value to be 195 N/mm2, while tensile strength is adjusted from 365MPa to 360N/mm2 (Table 3 of 1992 edition; Table 8 of this edition); The tensile strengths Rm for 20Cr13 (2Cr13) and 13Cr13 (1Cr13Mo) are adjusted respectively from 635MPa and 685MPa to 640N/mm2 and 690N/mm2 (Table 4 of 1992 edition; Table 9 of this edition); It has cancelled the stipulations on section shrinkage rate of flat steel (Table 3 ~ Table 5 of 1992 edition; notes of Table 6 to Table 10 of this edition); “Corrosion resistance” is changed to an item in agreement, where it has cancelled the two test methods contained in GB/T 4334.4 and GB/T 4334.6, while for the test condition of 06Cr19Ni13Mo3 (0Cr19Ni13Mo3) it has added “Sensitizing treatment” (Article 5.5 of 1992 edition; Article 7.5 of this edition); For “Surface quality” it has added that “It may specify to remove scales formed from heat treatment by way of pickling, turning or other methods through negotiations between the Supplier and the Buyer, which should be indicated in contract” (Article 5.8 of 1992 edition; Article 7.8 of this edition); It has clearly specified the sampling positions in “Macro strcture” and “Tower shape” for inspection of continuous casting steel and the sampling quantity for “Corrosion resistance” test (Article 12 of 1992 edition; Article 16 of this edition); It has cancelled “Check list for stainless steel grades of this Standard and stainless steel grades of each country” and changed to direct quotation of GB/T 20878: Stainless steel and heat-resisting steel –Grade and chemical compositions (Appendix B of 1992 edition; Table 1 ~ Table 5 of this edition). The Appendix A and Appendix B of this Standard are informative appendixes. This Standard is proposed by China Iron and Steel Association. This Standard is governed by National Technical Committee of Standardization for Iron and Steel. The main drafting units of this Standard include China Metallurgical Information and Standardization Institute and Liaoning Dongbei Special Steel Group Co., Ltd.. The major drafters of this Standard include Luan Yan, Dai Qiang, Gu Qiang, Zeng Wentao and Liu Baoshi. Versions issued in history to be substituted by this Standard include: ---------GB/T 1220—1975, GB/T 1220—1984, GB/T 1220—1992. 2 ......................................................... Normative documents quoted .................................................................................................................................................................................................................... Dimension................................................................................ Technical terms and definitions .................................................................................. Test methods ............................23 Appendix B .................................................................................. weight and permissible tolerance.. Packing.............5 8....................... Classification................... Contents in order sheet....................................................................... Technical requirements ..................4 4.......................................................................................... Scope..............................................................22 Appendix A ............GB/T 1220—2007 Contents 1.......27 1 ..................................................................................................23 (Informative appendix) ..........................1 2..................................................................27 (Informative appendix) ...................................................................................................... Inspection rules ................1 3...........................23 Typical heat treatment regulations for stainless steel bars or test pieces ................................................................................ marking and quality certificate..............4 5......................................................................................................... contour.........................................................................................................22 10...........4 7...........................................................21 9.......................4 6....... The volumetric method for determination of manganese content by ammonium nitrate oxidation GB/T 223.4 Methods for chemical analysis of iron. steel and alloy – The dimethyl glyoxime spectrophotometric method for the determination of nickel content GB/T 223.GB/T 1220—2007 1. steel and alloy –The chromazurine S spectrophotometric method for the determination of aluminium content GB/T 223.5 Methods for chemical analysis of iron. all their modifications made thereafter (excluding corrections) or revised versions shall not be applicable to this Standard. their latest versions shall be applicable to this Standard. For the dated documents so quoted. thickness or subtense distance.18 Methods for chemical analysis of iron. side length. steel and alloy . 2. steel and alloy –The tantalum reagent extraction spectrophotometric method for the determination of vanadium content GB/T 223. steel and alloy – The dimethyl glyoxime gravimetric method for the determination of nickel content GB/T 223. it may also supply the hot rolled and forged steel bars that the dimension is more than 250mm. steel and alloy – The sodium thiosulfate separation . steel and alloy – The reduction type silicomolybdic acid spectrophotometric method for the determination of acid-soluble silicon content GB/T 223.14 Methods for chemical analysis of iron.25 Methods for chemical analysis of iron. square steel. Through negotiations of both the Supplier and Buyer. hereinafter refer to as “Dimension”) is no more than 250mm. hereinafter refer to as “Steel bar”).3 Methods for chemical analysis of iron.iodine volumetric method for the determination of cuprum content GB/T 223.16 Methods for chemical analysis of iron. This Standard is applicable to the hot rolled and forged steel bars that the dimension (diameter. GB/T 222 Permissible tolerances for chemical composition of steel products GB/T 223. test methods.26 Methods for chemical analysis of iron.23 Methods for chemical analysis of iron. steel and alloy – The thiocyanate direct spectrophotometric method for the determination of molybdenum content 1 . contour. hexagonal steel and octagonal steel. flat steel.8 Methods for chemical analysis of iron. technical requirements . steel and alloy –The ammonium persulphate oxidation volumetric method for the determination of chrome content GB/T 223.11 Methods for chemical analysis of iron. of stainless steel bars (generic terms of round steel. steel and alloy .9 Methods for chemical analysis of iron. steel and alloy –The chromotropic acid spectrophotometric method for the determination of titanium content GB/T 223. Normative documents quoted Articles contained in the following documents have become articles of this Standard after they are quoted. For the undated documents so quoted. steel and alloy –The diantipyrylmethane spectrophotometric method for the determination of titanium content GB/T 223. Scope This Standard has stipulated the dimensions. etc. inspection rules. but all parties who have reached agreements on the basis of this Standard are encouraged to study on the implementation of the latest versions of these document.17 Methods for chemical analysis of iron. steel and alloy –The sodium fluoride separation-EDTA titration method for the determination of aluminium content GB/T 223. packing marks and certificate quality.The Diantipyrylmethane Phosphomolybdate Gravimetric Method for the Determination of phosphonium content GB/T 223. Part I: Test method (A.63 Methods for chemical analysis of iron. steel and alloy –The Butyl Acetate extraction photometric method for the determination of phosphonium content GB/T 223.1 – 2002.62 Methods for chemical analysis of iron.64 Methods for chemical analysis of iron. T measuring scales) (GB/T 230. 1983. G. steel and alloy –The potassium iodate titration method after combustion in the pipe furnace for determination of phosphonium content GB/T 223. steel and alloy –The ammonium phosphomolybdate volumetric method for the determination of phosphonium content GB/T 223.60 Methods for chemical analysis of iron. Steel – Macroscopic examination by etching with strong mineral adids) GB/T 228 Metallic material – Greenhouse tension test method (GB/T 228 –2002. eqv ISO 148.barium sulfate gravimetric method for determination of phosphonium content GB/T 226 Etch test for macrostructure and defect of steels (GB/T 226 – 1991.61 Methods for chemical analysis of iron. MOD) GB/T 231. N. steel and alloy –The gravimetric method after combustion in the pipe furnace for determination of carbon content GB/T 223.1 – 2004. steel and alloy –The perchloric acid dehydration method for the determination of silicon content GB/T 223.36 Methods for chemical analysis of iron.52 Methods for chemical analysis of iron. steel and alloy – The sulfochlorophenol S spectrophotometric method GB/T 223.68 Methods for chemical analysis of iron. F. neq ISO4969: 1980. H. steel and alloy – The alpha-Benzoin oxim gravimetric method for the determination of molybdenum content GB/T 223.GB/T 1220—2007 GB/T 223.58 Methods for chemical analysis of iron. neq ISO R 629) GB/T 223. C.72 Methods for chemical analysis of iron. B. steel and alloy –The flame atom absorption spectral method for the determination of manganese content GB/T 223. ISO 6508: 1999.iodine gravimetric method for the determination of selenium content GB/T 223.40 Determination of niobium content in iron.1 Metal –Brinell hardness test. steel and alloy – The distillation separation .28 Methods for chemical analysis of iron.37 Methods for chemical analysis of iron. steel and alloy –The hydroxylamine hydrochloride . steel and alloy –The aluminium oxide color layer separation . Steel – Charpy impact test (V-notch)) GB/T 230. E. steel and alloy –The sodium periodate (potassium periodate) photometric method for the determination of manganese content (GB/T 223. K. steel and alloy –The molybdenum blue photometric method for the determination of phosphonium content GB/T 223. D. steel and alloy –The gas volumetric method after combustion in the pipe furnace for determination of carbon content GB/T 223.neutralization titration method for the determination of nitrogen content GB/T 223. Steel – Charpy impact test (U-notch).59 Methods for chemical analysis of iron.indophenol blue spectrophotometric method for the determination of nitrogen content GB/T 223.71 Methods for chemical analysis of iron. eqv ISO 6892: 1998) GB/T 229 Metal – Charpy impact test method (GB/T 229 –1994. steel and alloy –The sodium arsenite sodium nitrite titration method for the determination of manganese content GB/T 223. eqv ISO 2 .1 Metal –Rockwell hardness test. eqv ISO 83: 1976.67 Methods for chemical analysis of iron. Part I: Test method (GB/T 231.63 – 1998. steel and alloy – The distillation separation . ISO 14284: 1996. IDT) GB/T 20878 Stainless steel and heat-resisting steel – Grades and chemical compositions YB/T 5293 Metallic materials-Forging test 3 . weight and permissible tolerance (GB/T 702—2004. contour. eqv ISO 6507-1: 1997) GB/T 6394 Metal – Methods for determination of the average grain size GB/T 6401 – 1986 Micrographic method for determining area fraction of the alpha-phases using charts in ferritic-austenitic duplex stainless steel GB/T 7736 Ultrasonic inspecting method for macro-structure and defect of steel GB/T 9971 – 2004 Pure iron for raw material GB/T 10121 Steel products--Method for magnetic particle inspection of tower sample GB/T 10561 Determination of nonmetal inclusion content in steels -. packaging. weight and permissible tolerance GB/T 17505 General technical requirements on delivery of steel and steel products (GB/T 17505 –1998.ferric sulfate corrosion test method GB/T 4334.3 Stainless steel – 65% nitric acid corrosion test method GB/T 4334. weight and permissible tolerance GB/T 1979 Standard diagrams for macrostructure and defect of structural steels GB/T 2101 General requirements of acceptance. contour. ISO1035-4: 1982. Hot-rolled steel bar – Part 4:Tolerances.copper sulfate corrosion test method GB/T 4340.Methods for radiographic inspection and classification of radiographs (GB/T 10561 – 2005.5 Stainless steel –sulfuric acid . marking and certification for section steel GB/T 2975 Steel and steel products--Location and preparation of test pieces for mechanical testing (GB/T 2975 – 1998.1 – 1999. eqv ISO 404: 1992) GB/T 20066 Iron and steel – Sampling and sample preparation method for determination of chemical compositions (GB/T 20066 – 2006. weight and permissible tolerance GB/T 705—1985 Metal – Hot-rolled hexagonal steel and octagonal steel – Dimension. ISO1035-2: 1980. ISO 1035-1: 1980. Hot-rolled steel bar – Part 1: Dimension of round bars.2 Stainless steel –sulfuric acid . weight and permissible tolerance GB/T 908—1987 Metal – Forged round steel and square steel – Dimension. MOD) GB/T 704—1988 Metal – Hot-rolled flat steel – Dimension. contour.GB/T 1220—2007 6506-1: 1999) GB/T 702—2004 Metal – Hot-rolled round steel and square steel – Dimension.1 Metal –Vickers hardness test. contour.1 Stainless steel – 10% oxalic acid etch test method GB/T 4334. IDT) GB/T 11170 Method for photoelectric emission spectral analysis of stainless steel GB/T 13305 – 1991 Micrographic method for determining area fraction of the alpha-phases in austenitic stainless steel GB/T 15574 Classification for steel products GB/T 15711 Steel products－Method for etch test of tower sample GB/T 16761 – 1997 Forged flat steel – Dimension. contour. ISO 4967: 1998. eqv ISO 377: 1997) GB/T 4334. Hot-rolled steel bar – Part 1: Dimension of square bars. Part I: Test method (GB/T 4340. ferrite type. g) Processing method used (See 5. weight and permissible tolerance of hot-rolled flat steel The dimension. Classification 5. it shall supply the steel for the purpose of cutting processing. Otherwise it shall execute the contract according to the common class as specified in GB/T 704 – 1998. Contents in order sheet The contract for goods or order form made according this Standard shall contain the following contents: a) Standard code. hexagonal or octagonal). Dimension. weight and permissible tolerance of hot-rolled round steel and square steel The dimension. h) Delivery state (See 7.GB/T 1220—2007 3. the concrete requirements of which should be indicated in contract. a) Steel for pressing processing UP 1) Hot-pressing processing UHP 2) Steel for hot-forging UHF 3) Blank for cold drawing UCD b) Steel for cutting processing UC 6. weight and permissible tolerance of hot-rolled hexagonal steel and octagonal steel 4 . the concrete requirements of which should be indicated in contract. otherwise. c) Grade or unified numerical code. martensite type and precipitation-hardening type. 5.1 Dimension. 6. weight and permissible tolerance of hot-rolled round steel and square steel shall conform to the stipulations set forth in GB/T 702 – 2004. weight and permissible tolerance 6. b) Product description. contour. steel bars are divided into five categories. i) Special requirements (See 7. weight and permissible tolerance of hot-rolled flat steel shall conform to the stipulations set forth in GB/T 704 – 1988.2 Dimension. 6. Application methods of steel bars should be indicated in contract. 5.2 By application methods.2 hereof). steel bars are divided into two categories. contour. Otherwise it shall execute the second group contained in GB/T 802 – 2004 Standard. f) Weight (or quantity).1 By structural features. Technical terms and definitions The technical terms and definitions established in GB/T 20878 and GB/T 15574 are applicable to this Standard. contour. including austenite type.3 Dimension. 4. contour.9 hereof). d) Section shape (round. square. contour. contour. austenite – ferrite type. e) Dimensions and contour (see Chapter 6 hereof). flat.2 hereof). 3.5 6. Dimension. 7. contour.2 Melting method Unless it is otherwise stipulated in contract. 7. The steel bars for hot-pressing processing shall not go through solution treatment. the concrete requirements of which should be indicated in contract. weight and permissible tolerance of forged flat steel shall conform to the stipulations set forth in GB/T 16761 – 1997. Dimension. which can be omitted through negotiations by both the Supplier and Buyer.3.3.3 Martensite type steel bars shall go through annealing treatment.6 The dimension. The regulations for heat treatment of all kinds of steel bars refer to Table A. weight and permissible tolerance of forged flat steel The dimension.1 ~ 7.3.4 hereof.2 Ferrite type steel bars shall go through annealing treatment.5 in Appendix A hereof. Otherwise it shall execute the contract according to the second group as specified in GB/T 16761 – 1997. contour. 7.GB/T 1220—2007 6. contour.1 Steel grades. 7. Weight Steel bars shall be delivered by actual weight. unified numerical code and chemical compositions (melting analysis) shall conform to the stipulations set forth in Table 1 ~ Table 5 hereof.1 ~ Table A. Otherwise.1. if there is no agreement. weight and permissible tolerance of forged round steel and square steel shall conform to the stipulations set forth in GB/T 908 – 1987. which can be omitted through negotiations by both the Supplier and Buyer.1. the concrete requirements of which should be indicated in contract. weight and permissible tolerance of forged round steel and square steel The dimension.4 6.1 Grade and chemical components 7.3 Delivery state Steel bars can be delivered in heat-treated or non-heat-treated state and the order can select delivery state with reference to Articles 7. 7. the concrete requirements of which should be indicated in contract. contour. 7. it shall usually adopt initial molten steel plus out-of-furnace refining process.3.1 Austenite type and austenite – ferrite type steel bars for cutting processing shall go through solution treatment. weight and permissible tolerance of hot-rolled hexagonal steel and octagonal steel shall conform to the stipulations set forth in GB/T 705 – 1985. 7. 7. annealing regulation shall be determined by the negotiations of both Supplier and Buyer. Technical requirements 7.2 The permissible tolerance for chemical compositions of steel bars shall conform to the stipulations set forth in GB/T 222. Precipitation-hardening type steel bars (excluding 05Cr17Ni4Cu4Nb) may not be treated through negotiations of both Supplier and Buyer. which should be indicated in contract. Otherwise it shall execute the contract according to the second group as specified in GB/T 908 – 1987. the annealing temperature shall usually be 650℃ ~ 680℃. contour. Otherwise it shall execute the contract according to the second group as specified in GB/T 705 – 1985. it shall deliver non-heat-treated steels.4 Precipitation-hardening type steel bars can select solution treatment or annealing treatment based on steel texture.3. 5 . 7.GB/T 1220—2007 7. heat treatment shall be conducted on original dimension steel bars.4.4. 7.4.4 Mechanical properties 7.3 For the non-heat-treated steel bars.2 For the heat-treated steel bars (except for martensite steel subject to annealing). 7. otherwise it shall execute the second group in contract. it may wholly or partially omit mechanical property test. 6 . the blank of test pieces shall be heat treated and its mechanical properties shall conform to the stipulations set forth in Table 6 ~ Table 10 hereof respectively. When the dimension of steel bar is less than 25mm.1 The heat treatment regulations for all kinds of steel bars of test pieces shall refer to the stipulations set forth in Table A. test pieces shall be no longer heat treated and its mechanical properties shall conform to the stipulations set forth in Table 6 ~ Table 10 hereof respectively.4 The mechanical properties of precipitation-hardening type steel bars shall be indicated in contract. The dimension of test piece blank for heat treatment shall usually be 25mm.5 If the Supplier can guarantee the qualification of mechanical properties.1 ~ Table A.4.4.5 of Appendix A hereof. 7. GB/T 1220—2007 Table 1 Chemical compositions of austenite type stainless steel Code in GB/T 20878 Unified numerical code New grade Original grade Chemical compositions (mass fraction) % C Si Mn P S Ni Cr Mo Cu N Other elements 1 3 9 13 15 16 17 18 22 23 24 25 26 32 35 38 7 . if necessary. unless it is otherwise indicated for range or minimum value.GB/T 1220—2007 Table 1 (Continued) Code in GB/T 20878 Unified numerical code New grade Original grade Chemical compositions (mass fraction) % C Si Mn P S Ni Cr Mo Cu N Other elements Note 1: All the elements listed in the table shall be maximum value. 8 . Value in bracket is the maximum value to put in or permissible content. Note 2: The comparison between the grades of this Standard and those of foreign standards refer to GB/T 20878. a It may add the alloy elements other than this table. Note 2: The comparison between the grades of this Standard and those of foreign standards refer to GB/T 20878.GB/T 1220—2007 Table 2 Chemical compositions of austenite-ferrite type stainless steel Code in GB/T 20878 Unified numerical code New grade Original grade Chemical compositions (mass fraction) % C Si Mn P S Ni Cr Mo Cu N Other elements Note 1: All the elements listed in the table shall be maximum value. 9 . unless it is otherwise indicated for range or minimum value. GB/T 1220—2007 Table 3 Chemical compositions of ferrite type stainless steel Code in GB/T 20878 Unified numerical code New grade Original grade Chemical compositions (mass fraction) % C Si Mn P S Ni Cr Mo Cu N Other elements Note 1: All the elements listed in the table shall be maximum value. 10 . copper content to be less than or equal to 0. a It is permissible for nickel content to be less than or equal to 0. unless it is otherwise indicated for range or minimum value. and it may add the alloy elements other than this table. Value in bracket is the maximum value to put in or permissible content Note 2: The comparison between the grades of this Standard and those of foreign standards refer to GB/T 20878.50%m.20%. if necessary. while Ni + Cu≤0.50%. GB/T 1220—2007 Table 4 Chemical compositions of Martensite type stainless steel Code in GB/T 20878 Unified numerical code New grade Original grade Chemical compositions (mass fraction) % C Si Mn P S Ni Cr Mo Cu N Other elements Note 1: All the elements listed in the table shall be maximum value. 11 . a The grade of adjusted compositions relative to GB/T 20878. Value in bracket is the maximum value to put in or permissible content Note 2: The comparison between the grades of this Standard and those of foreign standards refer to GB/T 20878. unless it is otherwise indicated for range or minimum value. 12 . Note 2: The comparison between the grades of this Standard and those of foreign standards refer to GB/T 20878. unless it is otherwise indicated for range or minimum value.GB/T 1220—2007 Table 5 Chemical compositions of precipitation-hardening type stainless steel Code in GB/T 20878 Unified numerical code New grade Original grade Chemical compositions (mass fraction) % C Si Mn P S Ni Cr Mo Cu N Other elements Note 1: All the elements listed in the table shall be maximum value. 2b/(N/mm 2 ) Tensile strength Rm /(N/mm2) Shrinkage rate after fracture A /% No less than Section shrinkage rate Zc /% HBW Hardness b HRB No more than 13 HV . non-proporti onal extension RP0.1) Code in GB/T 20878 Unified numerical code New grade Original grade Proof strength.GB/T 1220—2007 Table 6 Mechanical properties of austenite type steel bars or test pieces through solution treatment (See Table A. the Supplier can select one method to determine hardness according to the dimension and state of steel bars. side length. Proof strength. c. It is not applicable to flat steel. it can be forged into 180mm sample blank for test. in this case. it shall be decided through negotiation of both the Supplier and Buyer. for the steel bars of more than 180mm. or through negotiation of the Supplier and Buyer to stipulate that it is allowable to reduce the value of its mechanical properties. but when it is required by the Buyer.GB/T 1220—2007 Table 6 (Continued) Code in GB/T 20878 a. non-proportional extension RP0. Unified numerical code New grade Original grade Proof strength.2b/(N/mm2) Tensile strength Rm /(N/mm2) Shrinkage rate after fracture A /% No less than Section shrinkage rate Zc /% HBW Hardness b HRB HV No larger than This table is only applicable to the steel bars that the diameter. 14 . non-proportional extension and hardness shall only be tested when it is required by the Buyer (to be indicated in contract). thickness or subtense distance is less than or equal to 180mm. b. it shall be decided through negotiation of both the Supplier and Buyer.GB/T 1220—2007 Table 7 Mechanical properties of austenite-ferrite type steel bars or test pieces through solution treatment (See Table A. It is not applicable to flat steel. the Supplier can select one method to determine hardness according to the dimension and state of steel bars.2) Code in GB/T 20878 a. b. side length. Unified numerical code New grade Original grade Proof strength. c. or for the square steel and flat steel that the thickness is less than 12mm. but when it is required by the Buyer. thickness or subtense distance is less than or equal to 75mm. non-proportional extension RP0. for the steel bars of more than 75mm. or through negotiation of the Supplier and Buyer to stipulate that it is allowable to reduce the value of its mechanical properties. For the round steel. Proof strength. it can be forged into 75mm sample blank for test. in this case.2b/(N/mm2) Tensile strength Rm /(N/mm2) Shrinkage rate after fracture A /% No less than Section shrinkage rate Zc /% HBW Hardness b HRB HV No more than Table 7 is only applicable to the steel bars that the diameter. d. hexagonal steel and octagonal steel that diameter or subtense distance is less than or equal to 16mm. 15 . non-proportional extension and hardness shall only be tested when it is required by the Buyer (to be indicated in contract). it shall not conduct impact test. c. or for the square steel and flat steel that the thickness is less than 12mm. side length. or through negotiation of the Supplier and Buyer to stipulate that it is allowable to reduce the value of its mechanical properties. non-proportional extension RP0.2b/(N/mm2) Tensile strength Rm /(N/mm2) Shrinkage rate after fracture A /% Section shrinkage rate Zc /% Hardness b HBW HRB HV No less than No more than 78 83 S11348 S11203 06Cr13A1 022Cr12 0Cr13A1 00Cr12 175 195 410 360 20 22 60 60 78 -- 183 183 85 S11710 10Cr17 1Cr17 205 450 22 50 -- 183 86 S11717 Y10Cr17 Y1Cr17 205 450 22 50 -- 183 88 S11790 10Cr17Mo 1Cr17Mo 205 450 22 50 -- 183 94 S12791 008Cr27Mo 00Cr27Mo 245 410 20 45 -- 183 95 S13091 008Cr30Mo2 00Cr30M02 295 450 20 45 183 Table 7 is only applicable to the steel bars that the diameter.3)a Code in GB/T 20878 a.GB/T 1220—2007 Table 8 Mechanical properties of ferrite type steel bars or test pieces through annealing treatment (See Table A. Proof strength. it shall be decided through negotiation of both the Supplier and Buyer. Unified numerical code New grade Original grade Proof strength. the Supplier can select one method to determine hardness according to the dimension and state of steel bars. thickness or subtense distance is less than or equal to 75mm. d. non-proportional extension and hardness shall only be tested when it is required by the Buyer (to be indicated in contract). in this case. 16 . for the steel bars of more than 75mm. It is not applicable to flat steel. it shall not conduct impact test. hexagonal steel and octagonal steel that diameter or subtense distance is less than or equal to 16mm. b. it can be forged into 75mm sample blank for test. For the round steel. but when it is required by the Buyer. The property group of 17Cr16Ni2 steel shall be indicated in contract. 17 . It is not applicable to flat steel. for the steel bars of more than 75mm. side length.2b/(N/mm2) Tensile strength R m /(N/mm2) Shrinkage rate after fracture A /% 390 345 345 345 440 540 540 --700 600 ---- 590 490 540 540 640 735 735 25 24 22 17 20 12 8 1080 900~1050 800~950 ------ 490 ---- 690 ---- 10 12 14 ----20 ---- Section shrinkage rate Zb/% Charpy absorbed energy Aku2d/J HBW 55 60 55 45 50 40 35 118 -78 55 63 24 24 170 -159 159 192 217 217 45 25 (Agv) No less than 60 78 192 HEC -- Hardness of annealed steel bars HBW No more than 200 183 200 200 223 50 54 56 58 55 -50 55 55 235 235 235 285 295 255 255 269 269 255 200 207 269 269 Table 9 is only applicable to the steel bars that the diameter. b. the hardness is to be decided through negotiation of the Supplier and Buyer. non-proportional extension RP0. e. it shall be decided through negotiation of both the Supplier and Buyer. it can be forged into 75mm sample blank for test. thickness or subtense distance is less than or equal to 75mm. c. it shall not conduct impact test. Unified numerical code S40130 S41008 S41010 S41617 S42020 S42030 S42037 S42040 S43110 S43120 S44070 S44080 S44096 S44097 S44090 S45710 S45830 S45990 S46990 New grade Original grade Mechanical property of test piece through quench tempering (See Table A. For annealing by 750℃. otherwise it shall be selected by the Supplier himself. hexagonal steel and octagonal steel that diameter or subtense distance is less than or equal to 16mm. or for the square steel and flat steel that the thickness is less than 12mm. d.4) Group Code in GB/T 20878 12Cr12 06Cr13 12Cr13 Y12Cr13 20Cr13 30Cr13 Y30Cr13 40Cr13 14Cr17Ni2 17Cr16Ni2* 68Cr17 85Cr17 108Cr17 Y108Cr17 95Cr18 13Cr13Mo 32Cr13Mo 102Cr17Mo 90Cr18MoV 1Cr12 0Cr13 1Cr13 Y1Cr13 2Cr13 3Cr13 Y3Cr13 4Cr13 1Cr17Ni2 7Cr17 8Cr17 11Cr17 Y11Cr17 9Cr18 1Cr13Mo 3Cr13Mo 9Cr18Mo 9Cr18MoV 1 2 Proof strength. For the round steel.GB/T 1220—2007 Table 9 Mechanical properties of Martensite type steel bars or test pieces through heat treatment a 96 97 98 100 101 102 103 104 106 107 108 109 110 111 112 115 116 117 118 a. or through negotiation of the Supplier and Buyer to stipulate that it is allowable to reduce the value of its mechanical properties. but when it is required by the Buyer. it shall be decided through negotiation of both the Supplier and Buyer. c.5) steel bars or test pieces Code in GB/T 20878 a.GB/T 1220—2007 Table 10 Mechanical properties of precipitation-hardening type (See Table A. side length. thickness or subtense distance is less than or equal to 75mm. non-proportional extension RP0. for the steel bars of more than 75mm. The Supplier can select one method to determine hardness according to the dimension and state of steel bars 18 . b. or through negotiation of the Supplier and Buyer to stipulate that it is allowable to reduce the value of its mechanical properties. It is not applicable to flat steel.2b/(N/mm2) Tensile strength Rm /(N/mm2) -- -- -- 1 1180 1310 2 1000 1070 3 865 4 0 Heat treatment Precipitation hardening 138 Original grade Precipitation hardening 137 New grade Precipitation hardening 136 Unified numerical code Shrinkage rate after fracture A /% Section shrinkage rate Zb/% Hardness c HBW HRW -- ≤363 ≤38 10 35 ≥375 ≥40 12 45 ≥331 ≥35 1000 13 45 ≥302 ≥31 725 930 16 50 ≥277 ≥28 -- -- -- -- ≤363 ≤38 1 1180 1310 10 40 ≥375 ≥40 2 1000 1070 12 45 ≥331 ≥35 3 865 1000 13 45 ≥302 ≥31 Group Solution treatment 480℃ aging 550℃ aging 580℃ aging 620℃ aging Solution treatment 480℃ aging 550℃ aging 580℃ aging 620℃ aging Solution treatment 510℃ aging 0 NO LESS THAN 4 725 930 16 50 ≥277 ≥28 0 ≤380 ≤1030 20 -- 229 -- 1 1030 1230 4 10 ≥388 -- 565℃ aging 2 960 1140 5 25 ≥363 -- Solution treatment 510℃ aging 0 -- -- -- -- ≤269 -- 1 1210 1320 6 20 ≥388 -- 565℃ aging 2 1100 1210 7 25 ≥375 -- Table 10 is only applicable to the steel bars that the diameter. S51740 S51770 S51570 05Cr15Ni5Cu4Nb 05Cr17Ni4Cu4Nb 07Cr17Ni7A1 07Cr15Ni7Mo2A1 0Cr17Ni4Cu4Nb 0Cr17Ni7A1 0Cr15Ni7Mo2A1 Precipitation hardening 139 Type S51550 Proof strength. it can be forged into 75mm sample blank for test. but when it is required by the Buyer. but it shall be determined through negotiations of both the Supplier and Buyer before test.2 Tes t stat e Weight loss by corrosio n [g/(m2. as it is required by the Buyer.h )] agreeme nt GB/T 4334. the corrosion resistance of which refers to Table 11 and Table 12 hereof.3 Test state Solution treatme nt sensitizi ng treatme nt Weight loss by corrosio n [g/(m2.h )] agreeme nt agreeme nt GB/T 4334.5 Corrosion resistance It may conduct intercrystalline corrosion test on austenite type and austenite-ferrite type stainless steel bars. Table 11 Determination for 10% oxalic acid corrosion test in GB/T 4334.GB/T 1220—2007 7.5 sulfuric acid copper sulfate corrosion test Channel texture Channel texture Depression texture II Channel 39 S31603 022Cr17Ni12Mo2 00Cr17Ni14Mo2 texture 46 S31683 022Cr18Ni14Mo2Cu2 00Cr18Ni14Mo2Cu2 50 S31703 022Cr19Ni13Mo3 00Cr19Ni13Mo3 55 S32168 06Cr18Ni11Ti 0Cr18Ni10Ti --62 S34778 06Cr18Ni11Nb 0Cr18Ni11Nb a It may conduct sensitizing treatment.2 sulfuric acid . which should be indicated in contract.ferric sulfate corrosion test Channel texture sensitizing treatment Channel texture GB/T 4334.5 Tes t stat e State of curved surface under test No Intercrystall ine corrosion crack is allowed agreeme nt sensitizing treatment 46 Original grade sensitizing treatment 39 New grade Solution treatment Unified numeri cal code Solution treatment Cod e in GB/ T 2087 8 19 .3 65% nitric acid corrosion test Channel texture Depression texture II GB/T 4334.1 Code in GB/T 20878 Unified numerical code New grade Original grade 17 S30408 06Cr19Ni10 0Cr18Ni9 S31608 S31688 S31708 S30403 06Cr17Ni12Mo2 06Cr18Ni12Mo2Cu2 06Cr19Ni13Mo3* 022Cr19Ni10 0Cr18Ni9 0Cr17Ni12Mo2 0Cr18Ni12Mo2Cu2 00Cr19Ni10 Solution treatment 38 45 49 18 Test state GB/T 4334. with the proper test method decided through negotiations of both the Supplier and Buyer. Table 12 Intercrystalline corrosion test 17 38 45 49 18 50 41 S3040 8 06Cr19Ni10 0Cr18Ni9 S3160 8 S3168 8 S3170 8 S3040 3 06Cr17Ni12Mo2 0Cr17Ni12Mo2 06Cr18Ni12Mo2 Cu2 06Cr19Ni13Mo3* 0Cr18Ni12Mo2 Cu2 0Cr19Ni13Mo3* 022Cr19Ni10 00Cr19Ni10 S3160 3 S3168 3 S3170 3 S3166 8 022Cr17Ni12Mo2 00Cr17Ni14Mo2 022Cr18Ni14Mo2 Cu2 022Cr19Ni13Mo3 00Cr18Ni14Mo2 Cu2 00Cr19Ni13Mo3 06Cr17Ni12Mo2 Ti 0Cr18NNi12Mo 3Ti GB/T 4334. The corrosion resistance for the steel bars other than the grades listed in Table 11 and Table 12 shall be determined through negotiations of both the Supplier and Buyer. 1 Steel for hot heading upsetting (to be indicated in contract) shall be subject to hot forging test to forge test piece to one third of the original height without crack or breach on the surface.7.8 Surface quality 7. The depth for such elimination shall conform to the stipulation in Table 14 hereof and the width should be no less than 5 times of depth. or the minor cracks with depth to be no more than 0.6. Table 13 Macro structure qualification level Group Common porosity Center porosity Ingot type segregation Group 1 ≤Level 2 ≤Level 2 ≤Level 2 Group 2 ≤Level 3 ≤Level 3 ≤Level 3 7. When the Buyer requires group 1. For steel bars with dimension no more than 200mm.7. 7. It is permissible for steel bars for cutting processing to have subsurface inclusion or other inclusion with depth to be no more than half of nominal dimension tolerance. fold or inclusion on surface. inclusion. but it shall be determined through negotiations of both the Supplier and Buyer before test. Based on the agreement of the Supplier and Buyer.GB/T 1220—2007 55 S3216 06Cr18Ni11Ti 0Cr18Ni10Ti 8 62 S3477 06Cr18Ni11Nb 0Cr18Ni11Nb 8 a It may conduct sensitizing treatment. while the maximum elimination depth on the same cross section shall be no more than one and it is permissible for individual scratches. scab. Table 14 Permissible depth for defect elimination on the surface of steel bars for pressing processing purpose Nominal dimension of steel bars/mm Permissible depth of elimination ≤80 Half of nominal dimension tolerance of steel bars > 80 ~ 140 Nominal dimension tolerance of steel bars > 140 ~ 200 5% of nominal dimension of steel bars 20 . impressions or pockmarks whose size is no more than half of nominal dimension counting from actual dimension.3 If it can be guaranteed by the Supplier. crack.6 Macro structure 7.1 The acid dip macroscopic test piece of steel bar shall have no visible shrinkage cavity.8. 7. the qualification level for macro structure shall be decided through negotiations of the two parties. 7.20mm to exist on surface.6.2 This test can be omitted for steel bar with dimension to be more than 80mm if the Supplier can guarantee the qualification of forging test.1 The surface of steel bars for pressing processing shall have no crack. 7. it is permissible to apply ultrasonic detection or other nondestructive flaw detection methods in place of macro structure inspection. 7.2 The qualification level for acid dip macro structure shall conform to the stipulations set forth in Table 13 hereof. it should be indicated in contract. air bubble.7 Hot forging 7. the defects mentioned above must be eliminated.6. skull patch or shatter crack. the surface of steel bars for cutting processing can be turned or peeled. otherwise. d) Check alpha phase content.9 Special requirements Steel bars can be supplied by the following special requirements as requested by the Buyer and with agreement reached by both the Supplier and Buyer.GB/T 1220—2007 > 200 ~ 250 6% of nominal dimension of steel bars 7. a) Reduce the range of chemical compositions as listed in Table 1 ~ Table 5. 8. Table 16 Inspection item.2.1. on any of different steel bars for continuous cast steel On full piece of steel bar 2 2 On different steel bars GB/T 228 GB/T 229 GB/T 230. sampling quantity. f) Check grain size of steel. GB/T 4334. GB/T 11170.1. Test methods The inspection items and test methods for each lot of steel bars shall conform to the stipulations as set forth in Table 16 hereof.5 1 1 Any steel bar GB/T 226. GB/T 2975 2 2 different steel bars or blank equivalent to ingot head. GB/T 4334. 1 Inspection items Chemical compositions Samplinga quantity 1 Sampling position Test method GB/T 20066 GB/T 223 (see Chapter 2). which should be indicated in contract. GB/T 4334.2 It is permissible for steel bars for cutting processing to have local defects no more than stipulations counting from nominal dimension as set forth in Table 15 hereof.8. GB/T 13305—991 21 .8. sampling position and test method for steel bars No. turning or other methods through negotiations of both the Supplier and Buyer. GB/T 1979 GB/T 7736 YB/T 5293 GB/T 10561 GB/T 6394 GB/T 6401 –1986. h) Other special requirements. g) Add inspection with tower sample. Table 15 Permissible depth for local defects on the surface of steel bars for cutting processing Nominal dimension of steel bars/mm Permissible depth of local defects < 100 Negative deviation of nominal dimension of steel bars ≥100 Nominal dimension tolerance of steel bars 7. b) Restrict the upper limit of tensile strength as listed in Table 6 ~ Table 10. GB/T 231.3 It can remove the scale produced by heat treatment by pickling. 2 3 4 5 6 7 8 9 10 11 Tensile Impact Hardness intercrystalline corrosion Macro structure Ultrasonic inspection Hot forging Nonmetallic inclusion Grain size Alpha phase 2 2 2 2 On different steel bars.1. 7. GB/T 4340. Appendix A of GB/T 9971-2004.1 On different steel bars GB/T 4334.3. c) Add the test on corrosion resistance. e) Check nonmetallic inclusion content in steel. GB/T 1220—2007 12 Tower shape 2 different steel bars or blank equivalent to ingot head; on any of different steel bars for continuous cast steel On full piece of steel bar GB/T 15711, GB/T 10121 Piece by Calipers, micrometer caliper piece Piece by Visual inspection 14 Surface piece In addition to surface and dimension inspections piece by piece, the sampling quantity for all the other inspection items of electroslag remelted steel shall be 1. When lot is organized by the consumable electrode melting mother furnace number, in addition to 1 sample taken from each electroslag furnace number for chemical compositions, the sampling quantity for other inspection items shall be the same as stipulations in this table. 13 Dimension 9. Inspection rules 9.1 Inspection and acceptance The inspection and acceptance of steel bars shall be conducted by the technical and quality control departments of the Supplier. 9.2 Lot organization rules The inspection and acceptance of steel bars shall be carried out lot by lot. Each lot shall be composed of steel bars of the same grade, same furnace number, same processing method, same dimension and same delivery state (same furnace number of heat treatment). For the electroslag remelted steel, it is permissible to make delivery by the lot organized by the consumable electrode melting mother furnace number under the conditions that the process is stable and all technical requirements in this Standard can be guaranteed, which should be noted in certificate of quality. 9.3 Sampling position and sampling quantity The sampling position and sampling quantity for each lot of steel bars shall conform to the stipulations set forth in Table 16 hereof. 9.4 Rules for reinspection and determination 9.4.1 Rules for reinspection and determination shall execute the stipulations of GB/T 17505. 9.4.2 If the Supplier can guarantee the qualification of steel bars, it is permissible to use blank in place of product or use the large one in place of small one in the inspection results in connection with the mechanical property, macro structure and nonmetallic inclusion of steel bars or steel blanks from the same furnace number. 10. Packing, marking and quality certificate The packing, marking and quality certificate shall conform to the stipulations of GB/T 2101. 22 GB/T 1220—2007 Appendix A (Informative appendix) Typical heat treatment regulations for stainless steel bars or test pieces Table A.1 Typical heat treatment regulations for austenite type stainless steel bars or test pieces Code in GB/T 20878 Unified numerical code New grade Original grade Solution treatment/℃ 1 010 ~ 1 120, fast-cooling 1 010 ~ 1 120, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 030 ~ 1 150, fast-cooling 1 030 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 000 ~ 1 100, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 180, fast-cooling 1 030 ~ 1 150, fast-cooling 920 ~ 1 150, fast-cooling 980 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling a When it is indicated in contract by the Buyer, it may conduct heat treatment, in this case, the heat treatment temperature shall be 850℃ ~ 930℃. 23 GB/T 1220—2007 Table A.2 Typical heat treatment regulations for austenite-ferrite type stainless steel bars or test pieces New grade Original grade Solution treatment/℃ 67 Unified numerical code S21860 14Cr18Ni11Si4A1Ti 1Cr18Ni11Si4A1Ti 930 ~ 1 050, fast-cooling 68 S21953 022Cr19Ni5Mo3Si2N 00Cr18Ni5Mo3Si2 920 ~ 1 150, fast-cooling 70 S22253 022Cr22Ni5Mo3N 950 ~ 1 200, fast-cooling 71 S22053 022Cr23Ni6Mo3N 950 ~ 1 200, fast-cooling 73 S22553 022Cr25Ni6Mo2N 950 ~ 1 200, fast-cooling 75 S25554 03Cr25Ni6Mo3Cu2N 1 000 ~ 1 200, fast-cooling Code in GB/T 20878 Table A.3 Typical heat treatment regulations for ferrite type stainless steel bars or test pieces Code in GB/T 20878 Unified numerical code New grade Original grade Solution treatment/ ℃ 88 780 ~ 830, air cooling or slow-cooling 700 ~ 820, air cooling or slow-cooling 780 ~ 850, air cooling or slow-cooling 680 ~ 820, air cooling or slow-cooling 780 ~ 850, air cooling or slow-cooling 94 900 ~ 1 050, 78 83 85 86 fast-cooling 95 900 ~ 1 050, fast-cooling 24 it is permissible to carry out single tempering regulations by 620 ~ 720℃. 25 . air cooling 100~180 fast-cooling 100~180 fast-cooling 100~180 fast-cooling 100~180 fast-cooling 200~300 oil.4 (continued) Unified numerical code New grade Original grade Heat treatment regulations for steel bars Annealing /℃ S45710 13Cr13Mo 1Cr13Mo 830~900 slow-cooling or about 750 fast-cooling 800~900 slow-cooling or about 750 fast-cooling Heat treatment regulations for test pieces Quenching Tempering 970~1 020 oil cooling 1 025~1 075 oil cooling 650~750 fast-cooling 116 S45830 32Cr13Mo 3Cr13Mo 200~300 oil.GB/T 1220—2007 Table A.4 Typical heat treatment regulations for martensite type stainless steel bars or test pieces Code in GB/T 20878 96 Unified numerical code New grade Original grade 97 98 100 101 102 103 104 106 Heat treatment regulations for steel bars Annealing /℃ Heat treatment regulations for test pieces Quenching Tempering 800~900 slow-cooling or about 750 fast-cooling 800~900 slow-cooling or about 750 fast-cooling 800~900 slow-cooling or about 750 fast-cooling 800~900 slow-cooling or about 750 fast-cooling 800~900 slow-cooling or about 750 fast-cooling 800~900 slow-cooling or about 750 fast-cooling 800~900 slow-cooling or about 750 fast-cooling 800~900 slow-cooling or about 750 fast-cooling 950~1 000 oil cooling 950~1 000 oil cooling 950~1 000 oil cooling 950~1 000 oil cooling 920~980 oil cooling 920~980 oil cooling 920~980 oil cooling 1 050~1 100 oil cooling 950~1 050 oil cooling 950~1 050 oil cooling or air cooling 07 680~700 high-temperature tempering. air cooling Table A. air cooling 1 680~800furnace cooling or air cooling 2 108 800~920 slow-cooling 109 800~920 slow-cooling 110 800~920 slow-cooling 111 800~920 slow-cooling 112 800~920 slow-cooling Code in GB/T 20878 115 1 010~1 070 oil cooling 1 010~1 070 oil cooling 1 010~1 070 oil cooling 1 010~1 070 oil cooling 1 000~1 050 oil cooling 700~750 fast-cooling 700~750 fast-cooling 700~750 fast-cooling 700~750 fast-cooling 600~750 fast-cooling 600~750 fast-cooling 600~750 fast-cooling 200~300 air cooling 275~350 air cooling 600~650 air cooling 750~800 a+ 650~700 . water or air cooling 117 S45990 102Cr17Mo 9Cr18Mo 800~900 slow-cooling 1 000~1 050 200~300 oil cooling air cooling 118 S46990 90Cr18MoV 91Cr18MoV 800~920 slow-cooling 1 050~1 075 100~200 air oil cooling cooling a When nickel content is of the lower limit as specified in Table 4. fast-cooling after solution treatment 1 470~490 ℃ air-cooling after solution treatment 2 540~560 ℃ air-cooling after solution treatment 3 570~590 ℃ air-cooling after solution treatment 4 610~630 ℃ air-cooling after solution treatment 0 1 000~1 100 fast-cooling treatment 136 S51550 05Cr15Ni5Cu4Nb 480℃ Precipitation hardening ageing 550℃ ageing 580℃ ageing 620℃ 060 ℃ ageing Solution treatment 137 S51740 05Cr17Ni4Cu4Nb 0Cr17Ni4Cu4Nb 480℃ Precipitation hardening ageing 550℃ ageing 580℃ ageing 620℃ ageing Solution ℃ . fast-cooling after solution treatment 1 470~490 ℃ air-cooling after solution treatment 2 540~560 ℃ air-cooling after solution treatment 3 570~590 ℃ air-cooling after solution treatment 4 1 020~1 fast-cooling 0 1 020~1 060 ℃ . air cooled to room temperature.5Typical heat treatment regulations for precipitation-hardening type stainless steel bars or test pieces Code in GB/T 20878 Unified numerical code New grade Original grade Heat treatment Type Solution group Conditions 0 1 020~1 060 ℃ .GB/T 1220—2007 Table A. then cooled to -73 ℃ ±6 ℃ within 24 hours to be held for 8 hours before heating up to 510℃±10 ℃ to hold for 1 hours and air cooled 760 ℃ ±15 ℃ be kept for 90 minutes after solution treatment. cooled to 15℃ or less within 1 hours to hold for 30 minutes before heating up to 565℃±10 ℃ to hold for 90 minutes and air cooled 1 000~1 100 ℃ fast-cooling treatment S51570 07Cr15Ni7Mo2A1 0Cr15Ni7Mo2A1 Precipitation hardening 139 510℃ 1 ageing 565℃ ageing 2 955 ℃ ±10 ℃ be kept for 10 minutes after solution treatment. then cooled to -73 ℃ ±6 ℃ within 24 hours to be held for 8 hours before heating up to 510℃±10 ℃ to hold for 1 hours and air cooled 760 ℃ ±15 ℃ be kept for 90 minutes after solution treatment. cooled to 15℃ or less 26 . treatment 138 S51770 07Cr17Ni7A1 0Cr17Ni7A1 510℃ 1 Precipitation hardening ageing 565℃ 2 ageing Solution 0 955 ℃ ±10 ℃ be kept for 10 minutes after solution treatment. air cooled to room temperature. its property is similar to 12Cr17Ni7 (1Cr17 Ni7). It is the best material to make roller. water pool and traffic means.GB/T 1220—2007 within 1 hours to hold for 30 minutes before heating up to 565℃±10 ℃ to hold for 90 minutes and air cooled Appendix B (Informative appendix) Table B. it possesses better corrosion resistance under atmospheric conditions. It is mainly used to manufacture the structural parts and welded parts with lower requirements on corrosion resistance and strength. it is not proper to be used as welded structural material. but its elongation is a slightly poorer than 12Cr17Ni7(1Cr17Ni7). etc 1Cr18Mn8Ni5N Ni-free type steel is the most typical and better developed Cr-Mn-Ni-N type steel. etc) Y1Cr18Ni9Se In addition to adjustment made to phosphonium and sulphur contents in 12Cr18Ni9(1Cr18Ni9) steel. etc 1Cr18Ni9 The austenite stainless steel with the longest history possesses excellent plasticity. which can be used in place of 12Cr17Ni7 (1Cr17Ni7). It possesses very good anti-oxidation property below 800℃ while keeping higher strength. But it intends to have intergranular corrosion in sensitizing state or after welding. It is nonmagnetic in solution state and slightly magnetic after cold processing. bolt and nut. It is applicable to less cutting volume. kitchenware. toughness and cold processing property in solid solution state and better corrosion resistance in oxidable acid. and also suitable for hot processing or cold processing. It is mainly used to manufacture the equipment and units that are to withstand higher load under cold processing state while expecting lighter weight and corrosion resistance. shaft. It is mainly used for manufacturing hotel facilities. etc 1Cr17Ni7 Metastable austenite steel is the steel subject to easiest cold deformation strengthening. decoration plates. steam or other media. it can be used for nonmagnetic parts and parts for low temperature device. such as external decoration materials of buildings. conveyer belt and fasteners. so. such as cooking utensils and tableware. Cold processing shall offer high strength. It can obtain high strength and hardness through cold processing while keeping sufficient plastic strength. atmosphere. such as railway cars. etc. by fast cutting (by automatic lathe. selenium has also been added to improve the cutting property of 12Cr18Ni9(1Cr18Ni9) steel. Y1Cr18Ni9 12Cr18Ni9(1Cr18Ni9) improved cutting property steel. water. etc 27 . It is mainly used for manufacturing the parts subject to weak media corrosion and load below 800℃. such as screw and rivet.1 Stainless steel properties and applications New grade Original grade Properties and applications Code in GB/T 20878 Unified numerical code 1 S35350 12Cr17Mn6Ni5N 3 S35450 12Cr18Mn9Ni5N 9 S30110 12Cr17Ni7 13 S30210 12Cr18Ni9 15 S30317 Y12Cr18Ni9 16 S30327 Y12Cr18Ni9Se Austenite type 1Cr17Mn6Ni5N Ni-free type steel. which can be used in place of 12Cr18Ni9(1Cr18Ni9). 1 (continued) Original grade Properties and applications 18 S30403 022Cr19Ni10 00Cr19Ni10 22 S30488 06Cr18Ni9Cu3 0Cr18Ni9Cu3 S30458 06Cr19Ni10N 0Cr19Ni9N S30478 06Cr19Ni9NbN 0Cr19Ni10NbN S30453 022Cr19Ni9Ni10N 00Cr18Ni10N S30510 10Cr18Ni12 1Cr18Ni12 23 24 25 26 A steel developed on the basis of 12Cr18Ni9(1Cr18Ni9) steel. It is a stainless steel developed on the basis of 12Cr18Ni9(1Cr18Ni9) steel through increasing nickel content in steel. vessel and structural parts. but its corrosion resistance is better than 12Cr18Ni9(1Cr18Ni9) steel. it can also be used to make nonmagnetic/low-temperature equipment and parts This is a super low carbon austenite stainless steel developed to solve the problem that Cr23C6 seepage make 06Cr19Ni10(0Cr18Ni9) steel have severe intergranular corrosion tendency under certain conditions. As the intergranular corrosion resistance of 06Cr19Ni10N (0Cr19Ni9N) steel is remarkably lowered when it is heated under 450℃ ~ 900℃ temperature.GB/T 1220—2007 17 S30408 06Cr19Ni10 Code in GB/T 20878 Unified numerical code New grade 0Cr18Ni9 Table B. It can be used to make equipment or structural parts requiring certain corrosion resistance. as well as acid delivery pipe. it can be used to make welded part of small section dimension. its intergranular corrosion resistance in sensitizing state is remarkably better than 06Cr19Ni10(0Cr18Ni9) steel. Except for strength which is a slightly lower. etc. the properties and applications of which are the same as 06Cr19Ni10N(0Cr19Ni9N) steel It is extra-low carbon steel of 06Cr19Ni10N(0Cr19Ni9N). It is suitable for spinning and special purpose drawing. Addition of copper reduces the hardening tendency in cold processing and the reduction of hardening rate in cold processing offers maximum cold deformation under less forming pressure. Nitrogen and niobium are added to 06Cr19Ni10(0Cr18Ni9) steel to improve the pitting corrosion resistance and intergranular corrosion resistance of steel. but also to improve steel strength and hardening tendency in processing. Its processing hardening property is lower than 12Cr18Ni9(1Cr18Ni9) steel. so 022Cr19Ni10N(00Cr18Ni10N) steel is recommended to welded equipment and parts. It is suitable for manufacturing deep-punching formed parts. all the other properties are the same as 06Cr19Ni10(0Cr18Ni9) steel. improve the pitting corrosion resistance and intergranular corrosion resistance of steel and reduce material thickness. not only to prevent reduction of plasticity. It is mainly used to manufacture cold upsetting fastener and parts for cold forming like deep drawing. mainly used to make corrosion resistant equipment and parts by way of welding while it is impossible to carry out solution treatment after welding It is a stainless steel developed on the basis of 06Cr19Ni10(0Cr18Ni9) steel to improve its cold forming property. so it is a kind of stainless steel of largest quantity and most extensive range in application. its property is similar to 12Cr18Ni9(1Cr18Ni9) steel. etc Nitrogen is added to 06Cr19Ni10(0Cr18Ni9) steel. such as used as cold upsetting 28 . higher strength and lighter weight. it possesses excellent intergranular corrosion resistance and other properties are similar to 06Cr17Ni112Mo2(0Cr17Ni12Mo2) steel. pipes and vessels. fertilizer. its pitting resistance and stress corrosion resistance are better than 18-8 type stainless steel.1 (continued) Original grade Properties and applications 06Cr17Ni12Mo2Ti 0Cr18Ni12Mo3Ti S31658 06Cr17Ni12Mo2N 0Cr17Ni12Mo2N 44 S31653 022Cr17Ni12Mo2N 00Cr17Ni13Mo2N 45 S31688 06Cr18Ni12Mo2Cu2 0Cr18Ni12Mo2Cu2 46 S31683 022Cr18Ni14Mo2Cu2 00Cr18Ni14Mo2Cu2 This is a steel species developed to solve the problem that 06Cr17Ni112Mo2(0Cr17Ni12Mo2) steel have intergranular corrosion tendency. It is mainly used as pitting resistant material The extra-low carbon steel of 06Cr17Ni12Mo2 (0Cr17Ni12Mo2). to improve steel strength without reduction of plasticity and reduce material thickness. It is suitable for manufacturing the welded parts and equipment of thick section dimension. paper making. its corrosion resistance is better than 06Cr19Ni10(0Cr19Ni9) steel.GB/T 1220—2007 S30908 06Cr23Ni13 0Cr23Ni13 35 S31008 06Cr25Ni20 0Cr25Ni20 38 S31608 06Cr17Ni12Mo2 0Cr17Ni12Mo2 39 S31603 022Cr17Ni12M02 00Cr17Ni14Mo2 Code in GB/T 20878 41 Unified numerical code New grade S31668 43 32 steel. etc High-chrome-nickel austenite stainless steel. its anti-oxidation property is better than 06Cr23Ni3(0Cr23Ni3) steel. paper making. etc 2% of Cu is added to 06Cr17Ni12Mo2(0Cr17NiMo2) steel to improve its corrosion resistance and pitting corrosion resistance. which can also be used to make welded structural parts. but the intergranular corrosion resistance is much better. It can be used to make parts requiring good corrosion resistance and high strength Nitrogen is added to 022Cr17Ni12Mo2(00Cr17Ni14Mo2) steel so that it possesses the same properties as 022Cr17Ni12Mo2(00Cr17Ni14Mo2) steel and the applications are the same as 06Cr17Ni12Mo2N(0Cr17Ni12Mo2N) steel. etc It is the extra-low carbon steel of 29 . printing and dyeing and atomic energy industries Table B. In sea water and other media. It is suitable for manufacturing welded parts. Nitrogen is added to 06Cr17Ni12Mo2(0Cr17Ni12Mo2) steel. such as corrosion resistant material for equipment in petrochemical. with excellent sensitizing state intergranular corrosion resistance. as well. it can be used in both corrosion resistant parts and as heat-resisting steel Molybdenum is added to 10Cr18Ni12(1Cr18Ni12) steel so that the steel has excellent properties of reductive media resistance and pitting resistance. its corrosion resistance is better than 06Cr19Ni10(0Cr18Ni9) steel. but it mostly used as heat-resisting steel in actual application High-chrome-nickel austenite stainless steel with excellent corrosion resistance in oxidable media and very good high-temperature mechanical property. medicine making and high pressure equipment. It is mainly used in such fields as fertilizer. It is mainly used as sulfuric acid resistant material. Its intergranular corrosion resistance is better than 06Cr18Ni12Mo2Cu2 (0Cr18Ni12MoCu2) steel. pipe. alkali. bleaching facilities. printing and dyeing equipment. acetic acid equipment. salt and other media is the same as 06Cr18Ni11Ti (0Cr18Ni10Ti) steel. as well as used in the environment no applicable to less steel with pitting corrosion resistance better than 022Cr17Ni12Mo2 (00Cr17Ni14Mo2) steel and 06Cr17Ni12Mo2Ti (0Cr18Ni12Mo3Ti) steel Titanium is added to titanium stabilized austenite stainless steel to improve intergranular corrosion resistance. It is mainly used in the heat exchanger dealing with chlorine solion. heat exchanger and shafts. formic acid. Its intergranular corrosion resistance is better than 06Cr19Ni13Mo3 (0Cr19Ni13Mo3) steel. with good welding performance. phosphoric acid equipment. It can be substituted by extra-low carbon austenite stainless steel. etc. which has excellent high-temperature mechanical property. it can also be used as welding material Table B. etc. acetic acid and other media is much better than the common Cr-Ni steel containing 2 % ~ 4% of Mo.GB/T 1220—2007 49 S31708 06Cr19Ni13Mo3 0Cr19Ni13Mo3 50 S31703 022Cr19Ni13Mo3 00Cr19Ni13Mo3 52 S31794 03Cr18Ni16Mo5 0Cr18Ni16Mo5 55 S32168 06Cr18Ni11Ti 0Cr18Ni10Ti 62 S34778 06Cr18Ni11Nb 0Cr18Ni11Nb Code in GB/T 20878 64 Unified numerical code New grade S38148 06Cr18Ni13Si4 06Cr18Ni12Mo2Cu2 (0Cr18Ni12MoCu2) steel. and the corrosion resistance in sulfuric acid.1 (continued) Original grade Properties and applications 0Cr18Ni13Si4 Nickel and silicon are added to 06Cr19Ni10 (0Cr18Ni9) steel to improve its stress corrosion resistance and fracture property. It is used to make paper making equipment. It shall not be recommended other than special purposes (high temperature or hydrogen corrosion resistance) Niobium is added to niobium stabilized austenite stainless steel to improve intergranular corrosion resistance. to make vessel. The applications are the same as 06Cr18Ni12Mo2Cu2 (0Cr18Ni12MoCu2) steel The pitting corrosion resistance and creep resistance is better than 06Cr17Ni12Mo2 (0Cr17Ni12Mo) steel. It can be used both as corrosion resistance material and heat-resisting steel mainly in thermal power stations and petrochemical fields. etc. It 30 . The applications are the same as 06Cr19Ni13Mo3 (0Cr19Ni13Mo3) steel High-molybdenum stainless steel with pitting corrosion resistance better than 022Cr17Ni12Mo2(00Cr17Ni14Mo2) steel and 06Cr17Ni12Mo2Ti (0Cr18Ni12Mo3Ti) steel. petrochemical equipment and organic acid corrosion resistant equipment. etc It is the extra-low carbon steel of 06Cr19Ni13Mo3 (0Cr19Ni13Mo3) steel. the corrosion resistance in acid. it possesses excellent mechanical property and local corrosion resistance. while its plasticity. it is a steel of best pitting corrosion resistance. Its corrosion resistance is equivalent to 022Cr17Ni12Mo2 (00Cr17Ni14Mo2) steel. it is also applicable to chemical. paper pulp and paper making industries. etc 022Cr19Ni5Mo3Si2N 00Cr18Ni5Mo3Si2 It is a special purpose stainless steel with chloride stress corrosion resistance formed by adding 0. such as aqua fortis discharge valve. it can be used for cold/hot processing and forming. such as vehicle exhaust purifying device. or sealers for submarine. so. It can be used in place of 0Cr26Ni5Mo2 steel. for oil refining. etc. Its stainlessness and anti-oxidation is equivalent to low-chrome steel. The properties and applications are the same as 022Cr22Ni5Mo3N steel It comes from 0Cr22Ni5Mo3N steel by 022Cr25Ni6Mo2N increasing molybdenum content. its 022Cr22Ni5Mo3N application range is narrower. decreasing carbon content and adding nitrogen. natural gas. it can be used to make parts and equipment requiring resistance to high temperature and aqua fortis media.GB/T 1220—2007 can be used in the environment containing chloride ion. it is a dual phase stainless steel of most extensive applications in the world. it can also be used in place of 022Cr19Ni10 (00Cr19Ni10) steel and 022Cr17Ni12Mo2 (00Cr17Ni14Mo2) steel for applications in environment subject to stress corrosion damage Developed on the basis of Sweden SAF2205 022Cr22Ni5Mo3N steel. It is used to make oil well pipe. its wear resistance is better than common austenite stainless steel. toughness and cold forming property is better than other ferrite stainless steels containing higher chrome. used as structural material in place of 022Cr19Ni10 (00Cr19Ni10) and 022Cr17Ni12Mo2 (00Cr17Ni14Mo2) austenite stainless steel. the pressure equipment subject to pitting corrosion and stress corrosion Derived from 022Cr22Ni5Mo3N. It is applicable to the environment containing chloride ion to make heat exchanger and condenser.05% N ~ 0. petrochemical and chemical industries. It is mainly applied in the places not suitable for 12Cr13(1Cr13) steel or 10Cr17(1Cr17) steel 14Cr18Ni11Si4A1Ti 31 . heat exchanger and condensation cooler. etc 67 S31860 68 S21953 70 S22253 71 S22053 73 S22553 75 S25554 78 S11348 Austenite-ferrite type 1Cr18Ni11Si4A1Ti Silicon so contained has improved the strength and aqua fortis corrosion resistance of the steel. paper making. petrochemical. especially. etc. carbon dioxide and chloride. etc Developed on the basis of British Ferralium 03Cr25Ni6Mo3Cu2N alloy 255. fertilizer. featuring high strength. fertilizer and petrochemical industries to make heat exchanger and evaporator. chloride stress corrosion resistance and good welding performance. etc Ferrite type Low-chrome pure ferrite stainless steel is a 06Cr13A1 0Cr13A1 non-quench hardened steel. etc. It is mainly applied in the industrial fields like chemical. It can be used to make screw propeller and shaft for ship.10% N into Sweden 3RE60 steel. it is an ideal material for sea water environment. chemical storage tank. With resistance to the environment containing hydrogen sulfide. kitchen utensil. electric power industry. blade of steam turbine and clad steel plate. etc. etc It features high corrosion resistance. such as bolt and nut. water treatment industry and pollution control. lining. bolt and screw cap . It is mainly used as material for vehicle hub. lining of pressure vessel. etc Table B. crevice corrosion resistance and strength of the steel. As its brittleness changing temperature is higher than room temperature and it is sensitive to notching. such as 32 .GB/T 1220—2007 because of air quench hardening. it possesses excellent corrosion resistance and machining property. food industry. tank and other equipment Martensite type It is an excellent heat-resisting stainless steel for steam 1Cr12 turbine blades and high-stress parts Applicable to parts requiring higher toughness and subject to 0Cr13 impact load. but its stainlessness is not sufficient in the media containing higher chloride ion. processing/forming properties and welding performance. sheet plate is mainly applied in internal decorations of building. it is not suitable to be used to make the equipment and parts to withstand load below room temperature. to make heat exchanger. boiler combustion chamber. nozzle. It can applied in vehicle exhaust treatment device. mechanical property 1Cr17 and thermal conductivity with stainlessness in atmosphere. its properties are similar to 008Cr30Mo2(00Cr30Mo2) steel. pressure vessel. its corrosion resistance is equivalent to pure nickel.1 (continued) Properties and applications Code in GB/T 20878 83 Unified numerical code New grade Original grade S11203 022Cr12 00Cr12 85 S11710 10Cr17 86 S11717 Y10Cr17 88 S11790 10Cr17Mo 94 S12791 008Cr27Mo 95 S13091 008Cr30Mo2 96 S40310 12Cr12 97 S41008 06Cr13 98 S41010 12Cr13 It contains less carbon than 022Cr13 (0Cr13). such as absorption tower. etc. car decoration and gas burner.etc It is a semi-martensite type stainless steel with higher 1Cr13 strength and toughness through quench tempering treatment. its salt solution resistance is better than 10Cr17(1Cr17) steel. oil refining industry. water vapor or other media. and the section dimension for the steel material commonly used shall not exceed 4mm It is a steel for cutting purpose improved from Y1Cr17 10Cr17(1Cr17) mainly used to make the parts to be processed with large cutting volume by automatic lathe. fastener and external decoration of vehicle 00Cr27Mo It is the earliest steel among high pure ferrite stainless steel. heat exchanger. with better bending property at welded position. It is suitable for the applications requiring both corrosion resistance and soft-magnetic 00Cr30Mo2 It is a high pure ferrite stainless steel with low brittleness changing temperature and good property of halogen ion stress corrosion damage resistance. It is mainly applied in complete set of equipment for chemical industry (acetic acid. processing property and high temperature oxidation resistance. structural frame. lactic acid or other organic acids and superalkali concentration engineering). etc. It is mainly applied to the parts requiring higher toughness. office equipment. storage tank. etc Molybdenum is added to 10Cr17(1Cr17) steel to improve 1Cr17Mo the pitting corrosion resistance. such as oil making installation. It is mainly used in the chemical facilities producing nitric acid and grisoutite. possessing excellent toughness. such as steam turbine blades. stainlessness and subject to impact load. valve element for water press. used for automatic lathe Table B. hot oil pump and its shaft. levers. but it is no better than 12Cr13(1Cr13) and 20Cr13(2Cr13) steels. suitable for making corrosion resistant parts requiring higher strength. its strength and hardness is higher than 12Cr13(1Cr13) while its toughness and corrosion resistance is lower. but when it is hardened. valve. it can also be applied in paper making industry.1 (continued) Properties and applications Martensite type stainless steel. etc It is a steel to improve the cutting property of 30Cr13(3Cr13) steel. etc. not good for manufacturing welded parts It shall obtain higher mechanical property from heat treatment. etc. shafts. etc. as well as spring and fastener. organic acid and salts It is a hardenable stainless steel. it can also be used to make the equipment and parts requiring weak corrosive media resistance under normal temperature condition It is a steel with best cutting property among stainless steel. blade. valve and spring.etc It is Martensite type stainless steel. with certain corrosion resistance in diluted nitric acid and weak organic cid under room temperature. Mainly used to make surgical apparatus. shaft sleeve and blade. etc Its hardness is the highest among hardenable stainless steels 33 . the hardness is larger than 68Cr17(7Cr17) steel while toughness is better than 108Cr17(11Cr17) steel. valve and bearing to operate under 400 degree temperature. it possesses high strength and hardness while having stainlessness and corrosion resistance. The applications are similar to 30Cr13(3Cr13) steel. valve for water press and pyrolysis ant-sulphur corrosion equipment. fastener. hooks and other corrosion resistant parts requiring stainlessness and resistance to the corrosion of diluted oxidable acid. and the shaft. its hardenability is higher than 20Cr13(2Cr13) steel. valve. as well as wearing parts subject to high stress load under certain corrosive media conditions. As the carbon content is higher. Its property and applications are similar to 68Cr17 (7Cr17) steel. bolt. It is mainly used for strength parts. toughness and plasticity and load bearing parts working in damp media High-chrome Martensite type stainless steel. It is usually used to make shafts. requiring better cutting property The property and applications are similar to 30Cr13(3Cr13) steel. measuring tool. In quench hardened state. its strength. 40Cr13 (4Cr13) steel possesses poor welding performance. Mainly used to make parts subject to high stress load. main properties are similar to 12Cr13(1Cr13).GB/T 1220—2007 100 S41617 Y12Cr13 Y1Cr13 Code in GB/T 20878 101 Unified numerical code New grade Original grade S42020 20Cr13 2Cr13 102 S42030 30Cr13 3Cr13 103 S42037 Y30Cr13 Y3Cr13 104 S42040 40Cr13 4Cr13 106 S43110 14Cr17Ni2 4Cr17Ni2 107 S43120 17Cr16Ni2 108 S44070 68Cr17 7Cr17 109 S44080 85Cr17 8Cr17 110 S44096 108Cr17 11Cr17 cutting tool. but its toughness and corrosion resistance is slightly lower. hardness and hardenability is better than 12Cr13(1Cr13) and 20Cr13(2Cr13) steels. pump. bearing. its corrosion resistance is better than 12Cr13(1Cr13) and 10Cr17(1Cr17) steels. It is usually used to make cutting tool. such as cutting tools and spring to operate under 300 degree or less. etc. medical device industry and everyday consumables field to make cutting tool and tableware . requiring both high hardenability of mechanical property and resistance to nitric acid and organic acid corrosion Its processing property is obviously better than 14Cr17Ni2 (1Cr17Ni2) steel. such as steam turbine blade. piston rod. It is used to make cutting tool and valve seat. in addition to high strength. the corrosion resistance is better than Cr13 type. Corrosion resistance is better than Cr17 type Martensite type stainless steel. It is mainly used to make corrosion resistant and wearing resistant high-strength parts. spring and fastener. The main applications are the same as 30Cr13(3Cr13) steel. pump. its corrosion resistance is equivalent to 05Cr17Ni4Cu4Nb (1Cr17Ni2) steel. fatigue and water drop erosion is better than 12% martensite type stainless steel. valve element. such as shaft.1 (continued) Original grade Properties and applications 112 High-carbon Martensite type stainless steel. which should be noted in production. etc Molybdenum is added to 30Cr13(3Cr13) steel to improve steel strength and hardness. Its main applications are similar to 30Cr13(3Cr13) steel The property and applications are similar to 95Cr18(9Cr18) steel. such as measuring tool and cutting tool. It is high strength steel with better corrosion resistance than 12Cr13(1Cr13) steel. which has also strengthened secondary hardening effect. while other properties are similar to Cr17 type Martensite type stainless steel. Its property and applications are similar to 68Cr17 (7Cr17) steel. It is used to make jet nozzle and bearing. It is designed for automatic lathe 111 S44097 Code in GB/T 20878 Unified numerical code New grade S44090 95Cr18 9Cr18 115 S45710 13Cr13Mo 1Cr13Mo 116 SS45830 32Cr13Mo 3Cr13Mo 117 118 S45990 S46990 102Cr17Mo 90Cr18MoV 9Cr18Mo 9Cr18MoV 136 S51550 05Cr15Ni5Cu4Nb 137 S51740 05Cr17Ni4Cu4Nb Table B. but also excellent corrosion resistance. and it corrosion resistance is better than 30Cr13(3Cr13) steel. it is mainly applied to the service environment requiring not only high strength and good toughness. etc It is a steel species improve from 108Cr17 (11Cr17) steel. 95Cr18(9Cr18) and 14Cr17Ni2 (1Cr17Ni2) steels. It is used to make steam turbine blades and high temperature parts. its strength can be adjusted through changing heat treatment technique. valve elements of high pressure system and parts of air plane It is martensite precipitation-hardening type stainless steel added with copper and niobium. etc. Uneven carbohydrate is easy to form in this steel to affect steel quality and property. Because molybdenum and vanadium are added to this steel.GB/T 1220—2007 Y108Cr17 Y11Cr17 and stainless steels. such as high strength forged parts. it possesses also high transverse toughness and sound forgeability. It is mainly used to make the parts to withstand friction and work in corrosive media. its high temperature strength and anti-tempering capacity are better than 95Cr18(9Cr18) steel. etc Precipitation-hardening type 0Cr17Ni4Cu4Nb It is martensite precipitation-hardening type stainless steel developed from 05Cr17Ni4Cu4Nb (1Cr17Ni2) steel. the resistance to corrosion. levers. welding 34 . GB/T 1220—2007 138 S51770 07Cr17Ni7A1 0Cr17Ni7A1 139 S51570 07Cr15Ni7Mo2A1 0Cr15Ni7Mo2A1 procedure is simple and easy to be processed. washer and measuring device parts to work below 350℃ for a prolonged period of time. so there is tendency to be substituted by martensite ageing worldwide. spring.etc --------------------------- 35 . but it is hard to conduct deep cold forming. parts and structural parts with certain corrosion resistant requirements in astronautical navigation. pipe. petrochemical and energy fields . Such as the final level moving blade of steam turbine and the structural parts working in corrosive environment with operating temperature to be less than 300℃ It is semi-martensite precipitation-hardening type stainless steel added with aluminium. but there are still extensive application fields It is a semi-martensite precipitation-hardening type stainless steel using 2% Mo to substitute 2% Cr in 07Cr17NiAl (0Cr17NiAl) steel to improve its resistance to the corrosion of reductive media and its comprehensive performance is better than 07Cr17NiAl (0Cr17NiAl) steel. vessel. the compositions is nearly the same as 18-8 type austenite stainless steel with excellent melting and processing properties. It is mainly used to make high strength parts requiring both of stainlessness and resistance to corrosion of weak acid. alkalis and salt. It is used to make the high strength vessel. It can be used to make the structural parts. The technique for heat treatment of this steel is complicated.