BS 2S 140-1976.pdf
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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
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