1、BRITISH STANDARD AEROSPACE SERIES BS 2S 140:1976 (Superseding BS S 140) Incorporating Amendments Nos. 1, 2, 3 and 4 Specification for 2 “ %n ic k el - c h romi u m- 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
2、British 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 Dr
3、aft for comment 74/74367 DC ISBN 0 580 08769 7 Amendments issued since publication Amd. No. Date Comments 3529 August 1981 5678 October 1988 14159 30 May 2003 14821 1 March 2004 Clause 7.2.2 amendedBS 2S 140:1976 BSI 1 March 2004 i Contents Page Foreword ii 1 Inspection and testing procedure 1 2 Man
4、ufacture 1 3 Chemical composition 1 4 Surface dressing 1 5 Condition 1 6 Heat treatment 2 7 Mechanical properties 2BS 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. C
5、ompliance 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, an inside back cover and a back cover. The BSI copyright notice displayed in this document indica
6、tes when the document was last issued.BS 2S 140:1976 BSI 1 March 2004 1 NOTE The 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
7、 General. This British Standard 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 manu
8、factured by an electric process. 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 fin
9、ally heat treated. Bars for machining delivered in other than the finally heat treated condition (see 5.1)s e c t i o n s 1 a n d 2 Bars for machining delivered in the finally heat treated condition sections 1 and 3 Forging stock and billets and bars for subsequent working sections 1 and 5 Forgings
10、sections 1 and 6 Parts finally heat treated after machining sections 1 and 7 Element % min. max. Carbon 0.27 0.35 Silicon 0.15 0.35 Manganese 0.45 0.70 Phosphorus 0.025 Sulfur 0.015 Chromium 0.50 0.80 Molybdenum 0.45 0.65 Nickel 2.3 2.8 Aluminium 0.015 0.050 Designation Form Condition of supply S140
11、B Black bars for machining Finally heat treated S140D Bright bars for machining Finally heat treated before or after cold drawing or cold rolling or machining or grinding S140A Forging stock and billets and bars for subsequent working Softened S140C Forgings Finally heat treatedBS 2S 140:1976 2 BSI
12、1 March 2004 6 Heat treatment 6.1 Softening treatment. The softening 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
13、 by cooling in oil. b) Tempering. Heat uniformly at a temperature 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
14、 restore the proof stress. 7 Mechanical properties 7.1 Tensile test 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
15、.2 The hardness of material, parts and test samples heat treated in accordance with 6.2 shall be: 323 min./375 max. HB; or 340 min./395 max. HV. 0.2 % proof stress Tensile strength Elongation Izod impact min. min. max. min. min. MPa MPa MPa % ft lbf 880 1 080 1 280 10 25blankBS 2S 140:1976 BSI 389 C
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