1、BRITISH STANDARD AEROSPACE SERIES CONFIRMED JUNE 1999 BS S 153:1976 Incorporating Amendment No.1 Specification for 2“ % nickel-chromium- molybdenum steel billets, bars, forgings and parts (12301430 MPa: limiting ruling section40mm) UDC 629.7:669.15 24 26 28:669.14.018.29BSS153:1976 This British Stan
2、dard, 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 for comment 74/74367 DC IS
3、BN 0 580 08749 2 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. Summary of pages This do
4、cument 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. Amendments issued since publicat
5、ion Amd. No. Date of issue Comments 3523 August1981 Indicated by a sideline in the marginBSS153:1976 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 treatment 1 7 Mechanical properties 2ii blankBSS153
6、: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 12301430 MPa). 1 Inspection and testing procedure 1.1 General. This British Standard shall be used in conjunc
7、tion 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. 1.3 Ultrasonic examination. Billets and bars and, where applicable, forgings shall be subjected
8、 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 material shall be overall dressed. 5 Condition 5.1 Unless otherwise required by the order, the material shall be supplied in the
9、 appropriate condition stated below: 5.2 Parts shall be supplied finally heat 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 o
10、f the following: a) Hardening. Heat at a temperature of850 10 C, followed by cooling in oil. b) Tempering. Heat uniformly at a temperature of not less than 520 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
11、shall be given a stress-relieving treatment, which shall be sufficient to restore 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 sto
12、ck and billets and bars for subsequent working sections 1 and 5 Forgings sections 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 0.020 Chromium 0.50 0.80 Molybdenum 0.45 0.65 Nicke
13、l 2.3 2.8 Designation Form Condition of supply S153B Black bars formachining Finally heat treated S153D Bright bars formachining Finally heat treated before or after cold drawing or cold rolling or machining or grinding S153A Forging stock and billets and bars for subsequent working Softened S153C F
14、orgings Finally heat treatedBSS153:1976 2 BSI 01-2000 7 Mechanical properties 7.1 Tensile test at room temperature and impact test. The mechanical properties obtained from test pieces shall be as follows: NOTEInformation on SI units is given in BS3763“TheInternational System of units (SI)” and BS350
15、“Conversion factors and tables”. 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, parts and test samples heat treated in accordance with 6.2 shall be: 363 min./415 max. HB or 380 min./435 max. HV. 0.2
16、% 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 1030 1 230 1 430 9 20blankBS S 153:1976 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for p
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