《BS 2S 140-1976.pdf》由会员分享，可在线阅读，更多相关《BS 2S 140-1976.pdf（8页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD AEROSPACE SERIES BS 2S 140:1976 (Superseding BS S 140) Incorporating Amendments Nos. 1, 2, 3 and 4 Specification for 2“ % nickel-chromium- molybdenum steel billets, bars, forgings and parts (1 080-1 280 MPa: limiting ruling section 150 mm) ICS 49.025.10 ? BS 2S 140:1976 This British
2、 Standard, having been prepared under the direction of the Aerospace Industry Standards Committee, was published under the authority of the Executive Board on 31 March 1976 BSI 1 March 2004 The following BSI references relate to the work on this British Standard: Committee reference ACE/15 Draft for
3、 comment 74/74367 DC ISBN 0 580 08769 7 Amendments issued since publication Amd. No.DateComments 3529August 1981 5678October 1988 1415930 May 2003 148211 March 2004Clause 7.2.2 amended BS 2S 140:1976 BSI 1 March 2004 i Contents Page Forewordii 1Inspection and testing procedure1 2Manufacture1 3Chemic
4、al composition1 4Surface dressing1 5Condition1 6Heat treatment2 7Mechanical properties2 BS 2S 140:1976 ii BSI 1 March 2004 Foreword This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British St
5、andard 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, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was l
6、ast issued. BS 2S 140:1976 BSI 1 March 2004 1 NOTEThe specified chemical composition, heat treatment and tensile properties comply with AECMA Recommendation FE-PL73 (for material heat treated to a tensile strength of 1 080 1 280 MPa). 1 Inspection and testing procedure 1.1 General. This British Stan
7、dard shall be used in conjunction with the relevant sections of the latest issue of BS S 100 as follows: 1.2 Sulfur printing or deep etching tests. One sample shall be taken from each ingot for sulfur printing or deep etching tests. 2 Manufacture The material shall be manufactured by an electric pro
8、cess. 3 Chemical composition The steel shall contain: 4 Surface dressing The material shall be overall dressed. 5 Condition 5.1 Unless otherwise required by the order, the material shall be supplied in the appropriate condition stated below: 5.2 Parts shall be supplied finally heat treated. Bars for
9、 machining delivered in other than the finally heat treated condition (see 5.1)sections 1 and 2 Bars for machining delivered in the finally heat treated conditionsections 1 and 3 Forging stock and billets and bars for subsequent working sections 1 and 5 Forgings sections 1 and 6 Parts finally heat t
10、reated after machiningsections 1 and 7 Element% min.max. Carbon0.270.35 Silicon0.150.35 Manganese0.450.70 Phosphorus0.025 Sulfur0.015 Chromium0.500.80 Molybdenum0.450.65 Nickel2.32.8 Aluminium0.0150.050 DesignationFormCondition of supply S140BBlack bars for machiningFinally heat treated S140DBright
11、bars for machiningFinally heat treated before or after cold drawing or cold rolling or machining or grinding S140AForging stock and billets and bars for subsequent working Softened S140CForgingsFinally heat treated BS 2S 140:1976 2 BSI 1 March 2004 6 Heat treatment 6.1 Softening treatment. The softe
12、ning treatment shall consist of heating uniformly at a temperature of not less than 650 C. 6.2 Final heat treatment 6.2.1 The final heat treatment shall consist of the following: a) Hardening. Heat at a temperature of 850 10 C, followed by cooling in oil. b) Tempering. Heat uniformly at a temperatur
13、e of not less than 560 C, followed by cooling in air. 6.2.2 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. 7 Mechanical properties 7.1 Tensile t
14、est at room temperature and impact test. The mechanical properties obtained from test pieces shall be as follows: 7.2 Hardness test 7.2.1 The hardness of material heat treated in accordance with 6.1 shall be not greater than 248 HB. 7.2.2 The hardness of material, parts and test samples heat treated
15、 in accordance with 6.2 shall be: 323 min./375 max. HB; or 340 min./395 max. HV. 0.2 % proof stressTensile strengthElongation Izod impact min.min.max.min.min. MPaMPa MPa %ftlbf 8801 0801 2801025 blank BS 2S 140:1976 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is th
16、e independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure t
17、hat they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible
18、, the identity of which can be found on the inside front cover. Tel: +44 (0)20 8996 9000. Fax: +44 (0)20 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI
19、, international and foreign standards publications should be addressed to Customer Services. Tel: +44 (0)20 8996 9001. Fax: +44 (0)20 8996 7001. Email: ordersbsi-. Standards are also available from the BSI website at http:/www.bsi-. In response to orders for international standards, it is BSI policy
20、 to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. V
21、arious BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel: +44 (0)20 8996 7111. Fax: +44 (0)20 8996 7048. Email: infobsi-. Subscribing members of BSI are kept up to date with standards developments and recei
22、ve substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel: +44 (0)20 8996 7002. Fax: +44 (0)20 8996 7001. Email: membershipbsi-. Information regarding online access to British Standards via British Standards Online can
23、 be found at http:/www.bsi- Further information about BSI is available on the BSI website at http:/www.bsi-. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the C
24、opyright, 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
25、the standard, 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. Details and advice can be obtained from the Copyright & Licensing Manager. Tel: +44 (0)20 8996 7070. Fax: +44 (0)20 8996 7553. Email: copyrightbsi-.