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1、BRITISH STANDARD OBSOLESCENT FEBRUARY 1999 BS 2S 97: 1964 (Replacing BS S 97) Incorporating Amendment Nos. 1 and 2 Specification for aircraft material 2; per cent nickel-chromium- molybdenum steel (65/75 tonf/sq in: limiting ruling section 6 in) UDC 629.13:669.15242628 196 Licensed Copy: sheffieldun
2、 sheffieldun, na, Tue Nov 28 14:20:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2S 97:1964 This British Standard, having been approved by the Aircraft Industry Standards Committee and endorsed by the Chairman of the Engineering Divisional Council, was published under the authority of the General
3、 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 34466 5 A British Standard does not purport to include all the necessary provisions of a contract. Users of Br
4、itish Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2 and a back cover. This standard ha
5、s been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.Date of issueComments 6318January 1968 5677July 1988Indicated by a sideline in the margin Licensed Copy:
6、sheffieldun sheffieldun, na, Tue Nov 28 14:20:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2S 97:1964 BSI 02-2000i Contents Page 1Inspection and testing procedure1 2Process of manufacture1 3Chemical composition1 4Surface dressing1 5Condition2 6Final heat treatment2 7Mechanical properties2 Licens
7、ed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:20:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:20:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2S 97:1964 BSI 02-20001 NOTE 1Where metric equivalents are stated the figures in
8、 British units are to be regarded as the standard. Where Fahrenheit equivalents are stated, the temperatures in degrees Celsius are to be regarded as the standard. The conversions are approximate. More accurate conversions should be based on the tables in BS 350, “Conversion factors and tables”. NOT
9、E 2In place of the customary, but incorrect use of the pound, ton or kilogramme as units of force, the units called pound-force (abbreviation lbf), ton-force (abbreviation tonf) or kilogramme-force (abbreviation kgf) have been used in this standard. These are the forces which, when acting on a body
10、of mass one pound, one ton or one kilogramme respectively, give it an acceleration equal to that of standard gravity. 1 Inspection and testing procedure 1.1 This British Standard shall be used in conjunction with the relevant sections of BS 3S 100 as follows: 1.2 Sulphur printing or deep etching tes
11、ts. Samples shall be selected in accordance with BS 3S 100, Section 1, Clause 7.2.1. 2 Process of manufacture The material shall be manufactured by an electric process, unless otherwise agreed between the manufacture and the purchaser in accordance with BS 3S 100, Section 1, Clause 3.1. 3 Chemical c
12、omposition The steel shall contain: 4 Surface dressing The material shall be overall dressed in accordance with the requirements of BS 3S 100, Section 1, Clause 5.1. Bars for machining delivered in other than the finally heat treated condition. (see clause 5.1)Sections 1 and 2 Bars for machining del
13、ivered in the finally heat treated conditionSections 1 and 3 Billets and bars for forgingSections 1 and 5 ForgingsSections 1 and 6 Parts heat treated after machiningSections 1 and 7 Element Per cent min.max. Carbon Silicon Manganese Nickel Chromium Molybdenum Sulphur Phosphorus Aluminium 0.27 0.15 0
14、.45 2.3 0.5 0.45 0.015 0.35 0.35 0.7 2.8 0.8 0.65 0.015 0.025 0.050 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:20:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2S 97:1964 2 BSI 02-2000 5 Condition 5.1 The material shall be supplied in the appropriate condition stated below unless o
15、therwise 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. 5.2 Parts shall be supplied finally heat treated. 5.3 Parts made from forgings or bars in other than the finally heat treated condition shall b
16、e finally heat treated after being machined to as near finished size as practicable. 6 Final heat treatment 6.1 Except as provided in Clause 6.3, 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). b) Temper at a suitable temperature
17、between 560 C and 660 C (1 040 F and 1 220 F). 6.2 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. 6.3 Alternatively to Clause 6.1, forgings and p
18、arts shall be heat treated in accordance with the requirements of the drawing or order, subject to the provisions of BS 3S 100, Section 6, Clause 4.1, or Section 7, Clause 3.1. 7 Mechanical properties 7.1 Mechanical tests. Except where they are required by BS 3S 100 to be agreed between the manufact
19、urer and the purchaser, the mechanical properties obtained from test pieces selected and prepared in accordance with the relevant requirements of BS 3S 100 shall be: 7.2 Hardness a) The hardness of softened material shall be not more than 277 HB. b) The hardness of finally heat treated material and
20、parts shall be: 293 min./341 max. HB or 310 min./360 max. HV DesignationMaterialCondition of supply S.97BBlack bars for machiningFinally heat treated S.97DBright bars for machiningFinally heat treated and cold drawn or cold rolled or machined or ground before or after final heat treatment S.97ABille
21、ts and bars for forgingSoftened S.97CForgingsFinally heat treated 0.2 per cent proof stress Tensile strength Elongation per cent on gauge length Impact tonf/sq inkgf/mm2tonf/sq inkgf/mm25.65Soft lbf min.min.min.max.min.max.min.min. 558765751021181235 NOTEThe 0.1 per cent proof stress is expected to
22、be not less than 54 tonf/sq in (85 kgf/mm2). Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:20:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:20:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2S 97: 1964 BSI 389 Chiswick Hig
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30、Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standa
31、rd, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel: 020 8996 7070. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:20:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI