1、BRITISH STANDARD AEROSPACE SERIES CONFIRMED AUGUST 1985 BS S 150:1975 (Superseding BS HR 54) Incorporating Amendments Nos. 1 and 2 Specification for Chromium molybdenum vanadiumniobium heat-resisting steel billets, bars, forgings and parts (930 1 080 MPa) (Cr 10.5, Mo 0.6, V 0.2, Nb 0.3) ICS 49.025.
2、10 BS S 150:1975 This British Standard, having been approved by the Aerospace Industry Standards Committee, was published under the authority of the Executive Board on 30 September 1975 BSI 24 February 2004 The following BSI references relate to the work on this standard: Committee reference ACE/15
3、Draft for comment 73/32574 DC ISBN 0 580 08760 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ACE/15, Wrought and cast steels for aerospace, upon which the following bodies were represented: Civil Aviation Authority Ai
4、rworthiness Cast Metals Federation Confederation of British Metalforming Institute of Spring Technology MoD UK Defence Standardization Society of British Aerospace Companies Ltd. UK Steel Association Co Opted Member Summary of pages This document comprises a front cover, an inside front cover, pages
5、 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 last issued. Sidelining in this document indicates the most recent changes by amendment. Amendments issued since publication Amd. No. Date Comments 518
6、2 September 1986 14819 24 February 2004 Indicated by a sidelineBS S 150:1975 BSI 24 February 2004 i Contents Page Committees responsible Inside front cover 1 Inspection and testing procedure 1 2 Manufacture 1 3 Chemical composition 1 4 Surface dressing 1 5 Condition 2 6 Heat treatment 2 7 Mechanical
7、 properties 2ii blankBS S 150:1975 BSI 24 February 2004 1 NOTE The specified heat treatment and tensile and stress rupture properties comply with AECMA Recommendation FE PM 36 for material heat treated to a strength of 930/1 080 MPa. The specified chemical composition complies with current practice
8、in the United Kingdom and is similar to that given in FE PM 36. 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
9、 from each ingot for sulfur printing or deep etching tests. 1.3 Ultrasonic examination The material shall be ultrasonically tested in accordance with the latest issue of BS S 100, Annex B. 2 Manufacture The material shall be manufactured by an electric process. 3 Chemical composition The steel shall
10、 contain: 4 Surface dressing The material shall be overall dressed. 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 Sections 1 and 6 Parts finally heat treated after machining Sect
11、ions 1 and 7 Element % min. max. Carbon 0.08 0.16 Silicon 0.15 0.60 Manganese 0.3 1.2 Phosphorus 0.030 Sulphur 0.025 Chromium 9.8 11.2 Molybdenum 0.4 0.8 Niobium 0.15 0.45 Nickel 0.6 1.2 Vanadium 0.10 0.25 Nitrogen 0.030 0.075BS S 150:1975 2 BSI 24 February 2004 5 Condition 5.1 The material shall be
12、 supplied in the appropriate condition stated below: 5.2 Parts shall be supplied finally heat treated. 6 Heat treatment 6.1 Softening treatment The material shall be softened by heating uniformly at a temperature of not less than 690 C for not less than 2 h, followed by cooling in air. 6.2 Final hea
13、t treatment 6.2.1 The material, parts and test samples shall be heat treated as follows: a) Hardening. Pre-heat to a temperature between of 650C and 700 C and equalize. Heat at a temperature of 1 150 10 C, followed by cooling in oil or air. b) Tempering. Heat uniformly at a temperature between of 65
14、0 C and 700 C for not less than 2 h, followed by cooling in air. 6.2.2 Where bars delivered in the finally heat treated condition have been subjected to a cold straightening or cold rolling operation, they may be given a stress relieving treatment, which shall be sufficient to restore the proof stre
15、ss. 7 Mechanical properties 7.1 Tensile test at room temperature The mechanical properties obtained from test pieces shall be as follows: Note deleted 7.2 Hardness test 7.2.1 The hardness of material heat treated in accordance with 6.1 shall be not greater than 277 HB or 295 HV. 7.2.2 The hardness o
16、f material, parts and test samples heat treated in accordance with 6.2 shall be: 285 min./331 max. HB; or 290 min./345 max. HV. Designation Form Condition of supply S150B Black bars for machining Finally heat treated S150D Bright bars for machining Finally heat treated before or after cold drawing o
17、r cold rolling or machining or grinding S150A Forging stock and billets and bars for subsequent working Softened S150C Forgings Softened and finally heat treated 0.2 % proof stress Tensile strength Elongation Reduction of area min. min. max. min. min. MPa MPa MPa % % 780 930 1 080 10 40blankBS S 150
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