BS EN ISO 16859-3-2015.pdf

BS EN ISO 16859-3:2015BSI Standards Publication Metallic materials — Leeb hardness test Part 3: Calibration of reference test blocks BS EN ISO 16859-3:2015 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN ISO 16859-3:2015. The UK participation in its preparation was entrusted to Technical Committee ISE/101/5, Indentation hardness testing. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. © The British Standards Institution 2015. Published by BSI Standards Limited 2015 ISBN 978 0 580 78932 8 ICS 77.040.10 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2015. Amendments/corrigenda issued since publication Date Text affected Bulgaria. This European Standard exists in three official versions (English.040. 3: Kalibrierung von Härtevergleichsplatten (ISO 3:2015) 16859-3:2015) This European Standard was approved by CEN on 10 July 2015.Leeb hardness test . CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.EUROPEAN STANDARD EN ISO 16859-3 NORME EUROPÉENNE EUROPÄISCHE NORM October 2015 ICS 77. Luxembourg. Portugal. Slovakia. Italy. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17. Former Yugoslav Republic of Macedonia. Czech Republic. B-1000 Brussels © 2015 CEN All rights of exploitation in any form and by any means reserved Ref. Greece. Cyprus. Malta. Lithuania. Hungary. Belgium. No. Estonia. Germany. Ireland. EN ISO 16859-3:2015 E worldwide for CEN national Members. Sweden. Denmark. Slovenia. Iceland. Croatia. Spain. A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. Finland.Härteprüfung nach Leeb . French. France.Partie 3 Metallische Werkstoffe .Part 3: Calibration of reference test blocks (ISO 16859-3:2015) Matériaux métalliques . Latvia. German).Essai de dureté Leeb .Teil : Etalonnage des blocs de référence (ISO 16859. Romania. Turkey and United Kingdom. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. Netherlands. Poland. Norway.10 English Version Metallic materials . CEN members are the national standards bodies of Austria. Switzerland. . Netherlands. the national standards organizations of the following countries are bound to implement this European Standard: Austria. France. Belgium. Portugal. Ireland. Denmark. Germany. 3 . Malta.BS EN ISO 16859-3:2015 EN ISO 16859-3:2015 (E) European foreword This document (EN ISO 16859-3:2015) has been prepared by Technical Committee ISO/TC 164 “Mechanical testing of metals” in collaboration with Technical Committee ECISS/TC 101 “Test methods for steel (other than chemical analysis)” the secretariat of which is held by AFNOR. Hungary. Bulgaria. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. Slovakia. Italy. Romania. Slovenia. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. at the latest by April 2016. Norway. Lithuania. Estonia. Croatia. According to the CEN-CENELEC Internal Regulations. Turkey and the United Kingdom. Switzerland. either by publication of an identical text or by endorsement. Former Yugoslav Republic of Macedonia. Sweden. Czech Republic. Endorsement notice The text of ISO 16859-3:2015 has been approved by CEN as EN ISO 16859-3:2015 without any modification. Finland. Latvia. Cyprus. and conflicting national standards shall be withdrawn at the latest by April 2016. Greece. This European Standard shall be given the status of a national standard. Luxembourg. Poland. Spain. Iceland. .......................................................................................................................................................................................................................................2 Traceability................. 4 8 Marking....................... 4 7 Uniformity of hardness.................................................................................................................................................................................................. iv 1 Scope...12 Bibliography........................................................................... 13 © ISO 2015 – All rights reserved  iii ........................................................................................................................................................................................................................................................................................................... 2 4............................................... 6 Annex A (normative) Requirements for Leeb hardness calibration machines............ 4 6 Number of test indentations.................................................................................................................................................. 1 2 Normative references.....................................................................4 Calibration of calibration machines............................................................................................................................................................................................................................................................................1 General...................................................................................................... BS EN ISO 16859-3:2015 ISO 16859-3:2015(E)  Contents Page Foreword......... 3 5 Calibration procedure..................................................................................................................................................................... 7 Annex B (informative) Measurement uncertainty of reference test block............................. 2 4......................................................................................................................................................................................................................................................... 2 4................... 8 Annex C (informative) Examples of reference test block. 1 3 Manufacture of reference test blocks.................................................................................................................................................................................................. 1 4 Calibration machine............................................................................................................................................................................................................................................ 6 9 Validity............................................................................................ 2 4.................................................................................................................................................................................................................................................3 Requirements on calibration machines................................................................................................................................................................................................................................................................................................................................................ Supplementary Information The committee responsible for this document is ISO/TC 164. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. Part 1. Subcommittee SC 3. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives. For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment. International organizations. ISO shall not be held responsible for identifying any or all such patent rights. in liaison with ISO. ISO 16859 consists of the following parts. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www. Hardness testing.BS EN ISO 16859-3:2015 ISO 16859-3:2015(E)  Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). also take part in the work. Part 2 (see www. The work of preparing International Standards is normally carried out through ISO technical committees. under the general title Metallic materials — Leeb hardness test: — Part 1: Test method — Part 2: Verification and calibration of the testing devices — Part 3: Calibration of reference test blocks iv  © ISO 2015 – All rights reserved . In particular the different approval criteria needed for the different types of ISO documents should be noted. as well as information about ISO’s adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword .org/patents). Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee.iso. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. governmental and non-governmental. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives. Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. Mechanical testing of metals.org/directives).iso. Attention is drawn to the need to use a manufacturing process which will give the necessary homogeneity. The procedures necessary to ensure metrological traceability of the calibration machine are also specified.1 The block shall be specially manufactured for use as a reference test block. NOTE Examples of common dimensions of reference test blocks are specified in Annex C.2 and Table 3. stability of texture and uniformity of surface hardness. For undated references. are normatively referenced in this document and are indispensable for its application.3 The impact nature of a Leeb test requires a reference test block with a minimum mass and thickness. BS EN ISO 16859-3:2015 INTERNATIONAL STANDARD ISO 16859-3:2015(E) Metallic materials — Leeb hardness test — Part 3: Calibration of reference test blocks 1 Scope This part of ISO 16859 specifies a method for the calibration of reference test blocks that are used for the indirect verification of Leeb hardness testers according to ISO 16859-2 and for the periodic checking according to ISO 16859-1.2 The uniformity of the metallic reference test block shall meet the requirements specified in 7. Metallic materials — Leeb hardness test — Part  2: Verification and calibration of the testing devices ISO/IEC 17025. ISO 16859-1. General requirements for the competence of testing and calibration laboratories 3 Manufacture of reference test blocks 3. Metallic materials — Leeb hardness test — Part 1: Test method ISO 16859-2. 3. © ISO 2015 – All rights reserved  1 . the latest edition of the referenced document (including any amendments) applies. 2 Normative references The following documents. in whole or in part. as specified in Table 1. 3. For dated references. only the edition cited applies. l. Figure C.1 µm.7 To provide evidence that no material is removed from the test surface(s) of the reference test block subsequent to calibration. scratches. NOTE A four-level structure of the metrological chain is necessary to define and disseminate hardness scales. Ra.6 The test surfaces shall be free from damage. 4.5 The maximum deviation from surface flatness of the top and bottom surfaces shall not exceed 0. 4.3.1 General In addition to fulfilling the general conditions specified in ISO 16859-2:2015. 3. which interfere with the mechanics of the indentation process.02 mm per 50 mm. The metrological chain of hardness values obtained by the Leeb method is defined in ISO 16859-1:2015.BS EN ISO 16859-3:2015 ISO 16859-3:2015(E)  Table 1 — Mass and thickness requirements of reference test block Type of impact Minimum Minimum Minimum mass devices thickness diameter mm mm kg D.1 Leeb primary hardness standard machines owned by national level institutions are used to calibrate primary reference test blocks in Leeb hardness for accredited Leeb hardness calibration laboratories according to ISO/IEC 17025.2. 4 Calibration machine 4. C 33 85 2.1.80 mm (see ISO 4287:1997.2 The resolution of Leeb hardness calibration machines shall be equal to or better than 1. S.. 3. 4. etc. the thickness at the time of calibration shall be marked on the test surface(s) or printed on the calibration certificate to an accuracy of 0. a mark shall be placed on both the top and bottom surfaces. E.3 Requirements on calibration machines 4.0 HL.2 The instruments used for the verification and calibration of the Leeb hardness calibration machine shall be traceable to national standards. oxide layers.4.1 mm. 2  © ISO 2015 – All rights reserved . is 0. The maximum deviation from parallelism of the top and bottom surfaces shall not exceed 0.0 3.1.4 The reference test blocks shall be free of magnetism prior to calibration.7 G 65 115 6.3.2 Traceability 4. The sampling length. DL.2 to 4. the calibration machine shall also meet the requirements given in 4. see 8. [2] of the test surface(s) shall not exceed 0. The mean surface roughness. 3. Clause 3. 3. The surfaces of the blocks shall not be convex. D+15.01 mm.1 Requirements on Leeb hardness calibration machines are given in Annex A.1 e). 4.2. Alternatively.9). such as notches. and limiting error of calibration machines Type of impact Leeb hardness range for Minimum Limiting error device indirect calibration repeatability HLa WH GH   % % <500 1.0 ±1.0 ±2.0 ±1. an indirect calibration shall be conducted with at least three primary reference test blocks that cover the complete range of the Leeb hardness scale. HLC for impact devices C. Indirect calibration comprises at least 10 readings on each reference test block.0 <700 1.4.0 ±2. HLE for impact devices E.4.2 Leeb hardness calibration machines shall comply with the requirements defined in Annex A. Table 2 — Leeb hardness ranges.   Hi is the single Leeb hardness reading. D+15 500 to 700 1. BS EN ISO 16859-3:2015 ISO 16859-3:2015(E)  4.3 Following direct calibration.4.5 >700 1. HLG for impact devices G.4. minimum repeatability.   bH is the error of Leeb hardness.0 G 450 to 600 1.0 ±1.0 ±1. 4.5 >750 1. HLDL for impact devices DL.0 D.4 Calculation of error and repeatability of indirect calibration: n ∑ H i (1) 1 H= n 1 where   H is the Leeb hardness mean value.0 ±1.0 ±2.5 >600 1.0 ±1.0 ±2. 4.0 C. n ∑ H i − H CRM (2) 1 bH = n 1 where   HCRM is the Leeb hardness of primary reference test block. HLD+15 for impact devices D+15.0 a HLD for impact devices D.0 ±1.0 ±1.1 Leeb hardness calibration machines shall be calibrated at an interval of <12 months.0 <600 1. HLS for impact devices S.0 DL. © ISO 2015 – All rights reserved  3 . 4.5 >850 1. S 700 to 850 1.0 <450 1.4 Calibration of calibration machines 4. E 600 to 750 1. as defined in Table 2. 10 indentations are made evenly distributed over the entire test surface for each side. VH sH VH = ⋅100 % (5) H In indirect calibration.2 Reference test blocks are placed on a rigid steel plate of minimum thickness of 45 mm and minimum mass of 45 kg. thermal drift shall not exceed 1 °C.BS EN ISO 16859-3:2015 ISO 16859-3:2015(E)  In indirect calibration. …. H12. 6 Number of test indentations Leeb reference test blocks can be calibrated on both block surfaces (side A and side B). Standard deviation. During a calibration sequence. requirements concerning the limiting error of Leeb hardness are met when G H ≥ bH ( H ) + uCRM (3) where   GH is the limiting error of Leeb hardness (see Table 2).   uCRM is the calibration uncertainty of primary reference test blocks according to the calibration certificate for k = 1. The calibration value is assigned to the respective test surface. The arithmetic mean value(s) from the Leeb hardness calibration H A (and H B ) are calculated using Formula (7) and Formula (8). using the general procedure described in ISO 16859-1. The calibration value is calculated as the arithmetic mean of 10 single readings. the Leeb hardness values of test surface B are denoted H11. The plastic film shall serve for adhesion between the block and the steel plate. 7 Uniformity of hardness 7. The reference test block is coupled to steel plate using a thin plastic film (thickness <0. H2. During calibration.1 Reference test blocks are calibrated at a temperature of (23 ± 5) °C using Leeb hardness calibration machines conforming to Clause 4. …. WH.1 mm). sH n ∑(H i − H )2 sH = 1 (4) n −1 Variation coefficient. requirement concerning the minimum repeatability. If the block has two test surfaces. 5. 5 Calibration procedure 5.1 The Leeb hardness values of a test surface A of a reference test block are denoted H1.01 mm or better. (see Table 2) of Leeb hardness are met when: WH ≥ VH (6) where WH is the minimum repeatability of Leeb hardness (see Table 2). and whose contact surface has been ground to a flatness of 0. H20. 4  © ISO 2015 – All rights reserved . H10. . 7.0 a HLD for impact devices D. HLS for impact devices S.5 >600 1. HLG for impact devices G.0 C. BS EN ISO 16859-3:2015 ISO 16859-3:2015(E)  H 1 + H 2 + . E 600 to 750 1.0 G 450 to 600 1. HLC for impact devices C. HLDL for impact devices DL. Standard deviation: 10 ∑( H i − H A )2 sH A = 1 (9) n −1 20 ∑(H i − H B )2 sHB = 11 (10) n −1 Variation coefficient: sH A VH A = ⋅100 in % (11) HA sHB VH B = ⋅ 100 in % (12) HB Table 3 — Maximum variation coefficient for reference test block calibrations Type of impact Leeb hardness range of Maximum variation coefficient device reference test block   HLa % <500 2...0 <700 2. + H 10 HA= (7) 10 H 11 + H 12 + .0 DL.0 D. S 700 to 850 1.2 The variation coefficient provides the statistical parameter for the dispersion of the calibration values. D+15 500 to 700 1. + H 20 HB = (8) 10 7.0 <450 2. HLD+15 for impact devices D+15. Validity of results for the variation coefficients is defined in Table 3.5 >700 1. HLE for impact devices E. © ISO 2015 – All rights reserved  5 ..5 >750 1.3 Estimation of measurement uncertainty for reference test blocks is given in Annex B.5 >850 1.0 <600 2. c) single hardness values.1 Reference test blocks shall at least hold the following marks (preferably in form of an engraving on the edge of the test surface): a) arithmetic mean value from Leeb hardness calibration incl. d) name or mark of calibration agency. respectively (see 3.7). i. Attention is drawn to the fact that. d) measurement uncertainty of calibration. ISO 16859-3. arithmetic means and variation coefficients of reference test block.2 The mark for test surface A (B) that is put on the side of the block shall be upright when the test surface A (B) is the upper face. 8. Validity of the calibration should be limited to five years. 6  © ISO 2015 – All rights reserved .3 Reference test blocks shall hold accompanying documentation (a calibration certificate) providing the following information: a) a reference to this part of ISO 16859 . e) thickness of reference test block or markings on both test surfaces. e. the calibration validity should be reduced to two to three years. 799 HLD. c) serial number. e) date of calibration/date of issue.and Cu-alloys. b) name or mark of manufacturer or supplier of reference test block. if not indicated in the serial number. specification of device type. for Al. b) identification of reference test block.BS EN ISO 16859-3:2015 ISO 16859-3:2015(E)  8 Marking 8.g. 9 Validity Validity of a reference test block is limited to the testing conditions and for the impact device type used during calibration. f) year of calibration.e. 8. 002 ±0. vA Maximum m/s ±0.0025 ±0.03 0.5 ± 0.5 ± 0.45 ±  5.39 ± 0. b Ceramics.03 body.003 1.45 ±  7.03 0.003 ball. m Radius of mm 1.1 Leeb hardness calibration machines according to the principle of velocity measurement Table A.75 ±  3.40 ±  5.1 — Requirements on parameter implementation for Leeb hardness calibration machines Type of impact device Parameter Unit D S E DL D+15 C G Impact m/s 2.5 ± 0.003 1.5 ±  indenter 0. Table A. © ISO 2015 – All rights reserved  7 .1 gives the requirements for Leeb hardness calibration machines.5 ± 0.4 3. c Polycrystalline diamond.05 2.005 limiting deviation of impact velocity Mass of g 5.1 ±  20.0025 ±0.003 1.03 0.5 ± 0.05 1.03 0.03 0.0 ±  impact 0.05 2.03 0.002 ±0.0 velocity.003 2. BS EN ISO 16859-3:2015 ISO 16859-3:2015(E)  Annex A (normative) Requirements for Leeb hardness calibration machines A.003 1.002 ±0.0025 ±0.25 ±  7.7 1. r Material of   WC-Coa Cb PCDc WC-Coa WC-Coa WC-Coa WC-Coa indenter Vickers HV2 1600 ±  1600 ±  ≥ 4500 1600 ± 50 1600 ± 50 1600 ± 50 1600 ± 50 hardness of 50 50 indenter a Tungsten-carbide cobalt.003 1.82 1. B. Figure C.   uxCRM–1 is the standard uncertainty due to the repeatability of Leeb hardness calibration machine.1) 2 2 2 where   uCRM-P is the calibration uncertainty of primary reference test blocks according to the cali- bration certificate for k = 1.1.3.1 Direct calibration and verification of Leeb hardness calibration machines B. B. EXAMPLE See Tables B.2 Indirect calibration and verification of Leeb hardness calibration machines NOTE In this Annex. The overall performance of Leeb hardness calibration machines is verified by indirect verification using primary reference test blocks. this is used to determine the repeatability and error of the Leeb hardness calibration machine from the actual Leeb hardness.5 HLD temporal drift of primary reference test block: uCRM-D = 0 resolution of measurement system: δms = 1 HLD 8  © ISO 2015 – All rights reserved .0) HLD uncertainty of measurement of primary reference test block: uCRM-P = 2. B. “reference test block” is abbreviated as “certified reference material (CRM)”.   ums is the standard uncertainty due to resolution of measuring system.1): u CM = u CRM 2 −P + u xCRM −1 + u CRM −D + u ms (B. The measurement uncertainty for the indirect verification[3] of Leeb hardness calibration machine is calculated according to Formula (B. Also.2.   uCRM–D is the standard uncertainty due to the change of Leeb hardness of primary reference test blocks since the last calibration. 4. B.1 Calibration and verification of geometrical parameters of impact body and support ring See ISO 16859-2:2015.1.4. 4. B. and B.1.BS EN ISO 16859-3:2015 ISO 16859-3:2015(E)  Annex B (informative) Measurement uncertainty of reference test block NOTE The structure of the metrological chain that is required to define and reproduce hardness scales is shown in ISO 16859-1:2015. due to drift.3. primary reference test block: (767 ± 5.1.2 Calibration and verification of signal of electronic unit See ISO 16859-2:2015.4. 74 Normal 1.8 Standard deviation s×CRM-1 2.06 for n = 10: u×CRM–1 = 0.2 Standard measurement uncertainty 0. coefficient uncertainty uncertainty bution xi u(xi) ui(H) Xi ci HLD HLD HLD uCRM-P 767 2.0 2.74 u×CRM-1 t ⋅ s× CRM−1 u × CRM−1 = (B.29 uCRM–D 0 0 Triangular 1.74 ums 0 0.74 HLD Table B.29 Rectangular 1.2 — Components of measurement uncertainty Standard Sensitivity Contribution to Quantity Estimated value measurement Type of distri. BS EN ISO 16859-3:2015 ISO 16859-3:2015(E)  Table B.25 © ISO 2015 – All rights reserved  9 .5 Normal 1.5 uxCRM–1 0 0.2) n with Student’s t-factor t = 1.0 0.0 0 Combined measurement uncertainty uCM 2.62 Expanded measurement uncertainty UCM (where k = 2) 5.0 0.1 — Results of indirect calibration Displayed Leeb hardness value Nr HLD 1 763 2 768 3 767 4 768 5 764 6 767 7 765 8 767 9 770 10 769 Mean value 766. 87 HLD 10  © ISO 2015 – All rights reserved .06 and n = 10: u×CRM–2 = 0.3 Measurement uncertainty of reference test block The measurement uncertainty of reference test blocks[3] is given by Formula (B.   u×CRM–2 is the standard measurement uncertainty due to inhomogeneity of Leeb hardness of reference test block across the surface.3 — Determination of inhomogeneity of reference test block Calculated Leeb hardness value HCRM No HLD 1 764 2 770 3 768 4 768 5 765 6 770 7 766 8 767 9 772 10 771 Mean value 768.87 u×CRM-2 Standard uncertainty CRM: t ⋅ s× CRM −2 u × CRM−2 = (B.3): u CRM = u CM 2 + u xCRM 2 −2 (B.4) 10 using Student’s t-factor t = 1. Table B.1 Standard deviation s×CRM-2 2.BS EN ISO 16859-3:2015 ISO 16859-3:2015(E)  B.6 Standard measurement uncertainty 0.3) where   uCM is the uncertainty of the Leeb hardness calibration machine. 4 — Measurement uncertainty of reference test block Measurement Expanded calibration Leeb hardness of Inhomogeneity of uncertainty of Leeb uncertainty of reference reference test block reference test block hardness calibration test block machine HCRM uxCRM–2 uCM UCRM HLD HLD HLD HLD 767 0.52 with u CRM = 2 u CM 2 + u ×2CRM−2 © ISO 2015 – All rights reserved  11 .87 2. BS EN ISO 16859-3:2015 ISO 16859-3:2015(E)  Table B.62 5. DL. if they satisfy the requirements of 3. C 33 115 2. NOTE Additional examples of reference test block dimensions can be included in this part of ISO 16859 on request.1 gives examples of common dimensions of reference test blocks.7 G 65 115 6.3.75 D. E. C 55 85 2. D+15. D+15. E. DL.[1] 12  © ISO 2015 – All rights reserved . subject to proof of usability.0 Other dimensions can be used.2 and 3.BS EN ISO 16859-3:2015 ISO 16859-3:2015(E)  Annex C (informative) Examples of reference test block Table C. S. S. Table C.1 — Mass and thickness of common reference test blocks Type of impact Minimum Minimum Minimum mass devices thickness diameter   mm mm kg D. Geometrical Product Specifications (GPS) — Surface texture: Profile method — Terms. Yamamoto M. Current Status of Rebound Hardness Test Blocks in Japan and Outlook. Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) © ISO 2015 – All rights reserved  13 . Takagi S... BS EN ISO 16859-3:2015 ISO 16859-3:2015(E)  Bibliography [1] Yamamoto T. TC5 and TC22 Conferences ( 2010) 379-382 [2] ISO 4287. definitions and surface texture parameters [3] ISO/IEC Guide 98-3. Proceedings of IMEKO 2010 TC3. This page deliberately left blank . 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