BS 2S 143-1976 Specification for chromium-nickel-copper-molybdenum corrosion-resisting steel (precipitation hardening) billets bars forgings and parts (930-1080 MPa)《铬-镍-铜-钼耐腐蚀(沉淀硬.pdf
《BS 2S 143-1976 Specification for chromium-nickel-copper-molybdenum corrosion-resisting steel (precipitation hardening) billets bars forgings and parts (930-1080 MPa)《铬-镍-铜-钼耐腐蚀(沉淀硬.pdf》由会员分享,可在线阅读,更多相关《BS 2S 143-1976 Specification for chromium-nickel-copper-molybdenum corrosion-resisting steel (precipitation hardening) billets bars forgings and parts (930-1080 MPa)《铬-镍-铜-钼耐腐蚀(沉淀硬.pdf(6页珍藏版)》请在麦多课文档分享上搜索。
1、BRITISH STANDARD AEROSPACE SERIES BS 2S 143:1976 (Superseding BS S 143)Incorporating Amendments Nos. 1, 2, 3 and 4 Specification for Chromium-nickel- copper-molybdenum corrosion-resisting steel (precipitation hardening) billets, bars, forgings and parts (9301080 MPa) UDC 629.7:669.152624328 4:669.14
2、.018.8:669.14.018.298 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS 2S 143:1976 This British Standard, having been prepared under the direction of the Aerospace Standards Committee, wss published under the authority of the Executive Board on 31 August 1976 BSI 23 November
3、2001 The following BSI references relate to the work on this standard: Committee reference ACE/15 Draft for comment 75/74997 DC ISBN 0 580 09226 7 Summary of pages This document comprises a front cover, an inside front cover, pages 1 and 2, an inside back cover and a back cover. The BSI copyright no
4、tice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date of issue Comments 3527 August 1981 6775 December 1991 8567 May 1995 13268 30 November 2001 Change to 6.2c) Note that no foreword has ever been drafted for this standard.BS 2
5、S 143:1976 BSI 30 November 2001 1 1 Inspection and testing procedure 1.1 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
6、printing or deep etching tests. 1.3 Ultrasonic examination. Billets and bars and, where practicable, forgings shall be subjected to ultrasonic examination. 2 Manufacture The material shall be manufactured by an electric process. 3 Chemical composition The steel shall contain: 4 Surface dressing The
7、material shall be overall dressed. 5 Condition 5.1 The material shall be supplied in the appropriate condition stated below. 5.2 Parts shall be supplied finally heat treated. Bars for machining delivered in the finally heat treated condition sections 1 and 3 Forging stock and billets and bars for su
8、bsequent working sections 1 and 5 Forgings sections 1 and 6 Parts finally heat treated after machining sections 1 and 7 Element % min. max. Carbon 0.07 Silicon 0.60 Manganese 1.00 Phosphorus 0.035 Sulfur 0.025 Chromium 13.2 14.7 Copper 1.20 2.00 Molybdenum 1.20 2.00 Niobium 0.10 0.40 Nickel 5.0 5.8
9、Designation Form Condition of supply S143B Black bars for machining Finally heat treated S143D Bright bars for machining Finally heat treated and subsequently cold drawn, cold rolled, machined or ground S143A Forging stock and billets and bars for subsequent working Softened S143C Forgings Finally h
10、eat treatedBS 2S 143:1976 2 BSI 30 November 2001 6 Heat treatment 6.1 Softening treatment. The softening treatment shall consist of heating uniformly at a temperature between 610 C and 630 C for not less than 2 h, followed by cooling in air. 6.2 Final heat treatment. The final heat treatment shall c
11、onsist of the following: a) Solution treatment. Heat uniformly at a temperature between 1 000 C and 1 050 C for not less than 30 min, followed by cooling in air to a temperature not exceeding 30 C. b) Precipitation treatment, first stage. Heat at a temperature of 750 10 C for not less than 2 h, foll
12、owed by cooling in air to a temperature not exceeding 30 C. c) Precipitation treatment, final stage. Heat at a temperature between 530 C and 560 C for not less than 2 h, followed by cooling in air. 7 Mechanical properties 7.1 Tensile test at room temperature and impact test 7.1.1 Except as provided
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