BS 2S 98

Licensed Copy: Mrs.Kanjana Gopalakrishnan, Hindustan Aeronautics, 05/03/2009 09:10, Uncontrolled Copy, (c) BSI BRITISH STANDARD OBSOLESCENT FEBRUARY 1999 BS 2S 98: 1964 (Replacing BS S 98) Incorporating Amendment Nos. 1 and 2 Specification for aircraft material 2; per cent nickel-chromiummolybdenum steel (high carbon) — (75/85 tonf/sq in: limited ruling section 6 in) UDC 629.13:669.15’24’26’28-196 Kanjana Gopalakrishnan. No. This standard has been updated (see copyright date) and may have had amendments incorporated. pages 1 and 2 and a back cover. an inside front cover. Uncontrolled Copy. pages i and ii. 6319 5680 Date of issue January 1968 July 1988 Indicated by a sideline in the margin Comments .Licensed Copy: Mrs. Amendments issued since publication Amd. having been approved by the Aircraft Industry Standards Committee and endorsed by the Chairman of the Engineering Divisional Council. Compliance with a British Standard does not of itself confer immunity from legal obligations. was published under the authority of the General Council of the Institution on 31 January 1964 © BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference ACE/15 Draft for comment D62/3645 ISBN 0 580 34465 7 Summary of pages This document comprises a front cover. (c) BSI BS 2S 98:1964 A British Standard does not purport to include all the necessary provisions of a contract. This British Standard. This will be indicated in the amendment table on the inside front cover. 05/03/2009 09:10. Users of British Standards are responsible for their correct application. Hindustan Aeronautics. (c) BSI BS 2S 98:1964 Contents 1 2 3 4 5 6 7 Inspection and testing procedure Process of manufacture Chemical composition Surface dressing Condition Final heat treatment Mechanical properties Page 1 1 1 1 2 2 2 © BSI 02-2000 i . Uncontrolled Copy.Licensed Copy: Mrs. Hindustan Aeronautics. Kanjana Gopalakrishnan. 05/03/2009 09:10. Licensed Copy: Mrs. Hindustan Aeronautics. 05/03/2009 09:10. (c) BSI ii blank . Kanjana Gopalakrishnan. Uncontrolled Copy. 3 0.10 0.025 0.35 0. Sections 1 and 6.8 0.65 0. the units called pound-force (abbreviation lbf).45 — — 0.1 This British Standard shall be used in conjunction with the relevant sections of BS 3S 100 as follows: Bars for machining delivered in other than the finally heat treated condition. Clause 5. Section 1.3 Ultrasonic examination. “Conversion factors and tables”. Section 1. (See clause 5.1) Bars for machining delivered in the finally heat treated condition Billets and bars for forging Forgings Parts heat treated after machining Sections 1 and 2. 05/03/2009 09:10. Sections 1 and 3.1. The conversions are approximate. These are the forces which.015 0.1. Clause 3. 3 Chemical composition The steel shall contain: Element Per cent min. ton-force (abbreviation tonf) or kilogramme-force (abbreviation kgf) have been used in this standard. Sections 1 and 7.050 4 Surface dressing The material shall be overall dressed in accordance with the requirements of BS 3S 100. max. 1 Inspection and testing procedure 1. Uncontrolled Copy.5 0. Carbon Silicon Manganese Nickel Chromium Molybdenum Sulphur Phosphorus Aluminium 0. Hindustan Aeronautics. 2 Process of manufacture The material shall be manufactured by an electric process. Where Fahrenheit equivalents are stated. but incorrect use of the pound. 1. Samples shall be selected in accordance with BS 3S 100.2. Rolled billets and bars to this British Standard shall be subjected to ultrasonic examination for internal cavities in accordance with BS 3 S 100. 1. Kanjana Gopalakrishnan. one ton or one kilogramme respectively. More accurate conversions should be based on the tables in BS 350. unless otherwise agreed between the manufacturer and the purchaser in accordance with BS 3S 100. ton or kilogramme as units of force.015 0. Sections 1 and 5.7 2. NOTE 2 In place of the customary. Appendix C. give it an acceleration equal to that of standard gravity. Clause 7. when acting on a body of mass one pound. © BSI 02-2000 1 .2 Sulphur printing or deep etching tests.44 0.45 2. (c) BSI BS 2S 98:1964 NOTE 1 Where metric equivalents are stated the figures in British units are to be regarded as the standard.1.36 0.Licensed Copy: Mrs. the temperatures in degrees Celsius are to be regarded as the standard.8 0. Section 1. 98A S. Elongation per cent on gauge length 5. 6.1.2 per cent proof stress tonf/sq in min.2 Hardness.3 Parts made from forgings or bars in other than the finally heat treated condition shall be finally heat treated after being machined to as near finished size as practicable.Licensed Copy: Mrs. Impact ft lbf min. the mechanical properties obtained from test pieces selected and prepared in accordance with the relevant requirements of BS 3S 100 shall be: 0. the final heat treatment shall be: a) Harden in oil from a temperature between 820 °C and 850 °C (1 510 °F and 1 560 °F). (c) BSI BS 2S 98:1964 5 Condition 5.1 Except as provided in Clause 6. forgings and parts shall be heat treated in accordance with the requirements of the drawing or order. Uncontrolled Copy. max.98C Billets and bars for forging Forgings Softened Finally heat treated 5.98D Black bars for machining Bright bars for machining Finally heat treated Finally heat treated and cold drawn or cold rolled or machined or ground  before or  after final  heat   treatment S. kgf/mm2 min. 6./410 max.3. kgf/mm2 min.1 Mechanical tests. Except where they are required by BS 3S 100 to be agreed between the manufacturer and the purchaser.1 per cent proof stress is expected to be not less than 65 tonf/sq in (102 kgf/mm2). 7 Mechanical properties 7. or Section 7. 65 NOTE 102 75 85 118 134 10 25 The 0.1.1. 5.1 The material shall be supplied in the appropriate condition stated below unless otherwise agreed between the manufacturer and the purchaser in which case the condition in which the material is to be supplied shall be stated on the order. b) Temper at a suitable temperature between 500 °C and 660 °C (930 °F and 1 220 °F).65ÆSo min. Clause 4. Hindustan Aeronautics. Designation Material Condition of supply S. Tensile strength tonf/sq in min. The hardness of finally heat treated material and parts shall be: 341 min.2 Hardened and tempered bars which have been subjected to a cold straightening or cold rolling operation shall be given a stress relieving treatment which shall be sufficient to restore the proof stress. max. Kanjana Gopalakrishnan.2 Parts shall be supplied finally heat treated. HB or 360 min.98B S. 6 Final heat treatment 6. 05/03/2009 09:10.3 Alternatively to Clause 6. Section 6./388 max. subject to the provisions of BS 3S 100. Clause 3. 7. HV 2 © BSI 02-2000 . Kanjana Gopalakrishnan. 05/03/2009 09:10. (c) BSI blank .Licensed Copy: Mrs. Hindustan Aeronautics. Uncontrolled Copy. In response to orders for international standards. in the course of implementing the standard. type or grade designations. Fax: 020 8996 7001. Except as permitted under the Copyright. It is incorporated by Royal Charter. Contact the Information Centre. 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