1、BRITISH STANDARD AEROSPACE SERIES CONFIRMED JUNE 1999 BS S 154:1976 Superseding BS2S 96 Incorporating Amendment Nos.1 and2 Specification for 2“ % nickel-chromium- molybdenum steel billets, bars, forgings and parts (8801080 MPa: limiting ruling section150mm) UDC 629.7:669.15 24 26 28:669.14.018.29BSS
2、154:1976 This British Standard, having been prepared under the directionof the Aerospace IndustryStandards Committee,was published underthe authority of the Executive Board on 31 March1976 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/15 Draft
3、for comment 74/74367 DC ISBN 0 580 08759 X A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations
4、. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2 and abackcover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendm
5、ents issued since publication Amd. No. Date of issue Comments 3818 October 1981 5676 October1988 Indicated by a sideline in the marginBSS154:1976 BSI 01-2000 i Contents Page 1 Inspection and testing procedure 1 2 Manufacture 1 3 Chemical composition 1 4 Surface dressing 1 5 Condition 1 6 Heat treatm
6、ent 1 7 Mechanical properties 2ii blankBSS154:1976 BSI 01-2000 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 880 1080 MPa). 1 Inspection and testing procedure 1.1 General. T
7、his British Standard shall be used in conjunction with the relevant sections of the latest issue of BS S 100 as follows: 1.2 Sulphur printing or deep etching tests. Onesample shall be taken from each ingot for sulphur printing or deep etching tests. 2 Manufacture The material shall be manufactured b
8、y 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 finally heat
9、treated. 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 of850 10 C, followed by c
10、ooling in oil. b) Tempering. Heat uniformly at a temperature of not less than 600 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 rest
11、ore the proof stress. Bars for 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 condition sections 1 and 3 Forging stock and billets and bars for subsequent working sections 1 and 5 Forgings secti
12、ons 1 and 6 Parts finally heat treated aftermachining 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 Sulphur 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 S154B Bla
13、ck bars formachining Finally heat treated S154D Bright bars formachining Finally heat treated before or after cold drawing or cold rolling or machining or grinding S154A Forging stock and billets and bars for subsequent working Softened S154C Forgings Finally heat treatedBSS154:1976 2 BSI 01-2000 7
14、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 than248HB. 7.2.2 The hardness of material, pa
15、rts and test samples heat treated in accordance with 6.2 shallbe: 255 min./321 max. HB or 270 min./340 max. HV. 0.2% proof stress Tensile strength Elongation Izod impact min. min. max. min. min. MPa (= N/mm 2 ) MPa (= N/mm 2 ) MPa (= N/mm 2 ) % ft lbf 690 880 1080 12 40 NOTEInformation on SI units i
16、s given in BS3763“TheInternational System of units (SI)” and BS350“Conversion factors and tables”.blankBS S 154:1976 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on sta
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