1、BRITISH STANDARD AEROSPACE SERIES BS S 151:1975 Incorporating Amendments Nos. 1 and 2 Specification for Chromium-nickel- molybdenum-vanadium heat-resisting steel billets, bars, forgings and parts (9301130 MPa: limiting ruling section 150 mm) (Cr 12, Ni 2.5, Mo 1.7, V 0.3) UDC 629.7:669.15 262428 292
2、 4:669.14.018.4 BS S 151:1975 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 14 October 2002 The following BSI references relate to the work on this standard: Committee refer
3、ence ACE/15 Draft for comment 73/32574 DC ISBN 0 580 08750 6 Foreword This publication has been prepared by Technical Committee ACE/15, Wrought and cast steels for aerospace. The start and finish of text introduced or altered by amendment is indicated in the text by tags . Tags indicating changes to
4、 text carry the number of the amendment. For example, text altered by amendment No. 1 is indicated by . This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself co
5、nfer 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 indicates when the document was last used. Amendments issued
6、since publication Amd. No. Date Comments 3783 31 December 1981 See foreword 13678 14 October 2002 See forewordBS S 151:1975 BSI 14 October 2002 i Contents Page Foreword Inside front cover 1 Inspection and testing procedure 1 2 Manufacture 1 3 Chemical composition 1 4 Surface dressing 1 5 Condition 2
7、 6 Heat treatment 2 7 Mechanical properties 2ii blankBS S 151:1975 BSI 14 October 2002 1 NOTE This specified chemical composition compiles with AECMA Recommendation FEPM37 1 Inspection and testing procedure 1.1 General. This British Standard shall be used in conjunction with the relevant sections of
8、 the latest issue of BS S 100 as follows: 1.2 Sulphur printing or deep etching tests. One sample shall be taken from each ingot for sulphur printing or deep etching tests. 1.3 Ultrasonic examination. The material shall be ultrasonically tested in accordance with BS S 100, Annex B. 2 Manufacture The
9、material shall be manufactured by an electric process. 3 Chemical composition The steel shall 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 worki
10、ng Sections 1 and 5 Forgings Sections 1 and 6 Parts finally heat treated after machining Sections 1 and 7 Element % min. max. Carbon 0.08 0.13 Silicon 0.35 Manganese 0.5 0.9 Phosphorus 0.030 Sulphur 0.025 Chromium 11.0 12.5 Molybdenum 1.5 2.0 Nickel 2.0 3.0 Vanadium 0.25 0.40 Nitrogen 0.020 0.040BS
11、S 151:1975 2 BSI 14 October 2002 5 Condition 5.1 The material shall be 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 between 670 C an
12、d 720 C for not less than 6 h, followed by cooling in air. 6.2 Final heat treatment 6.2.1 The material, parts and test samples shall be heat treated as follows: a) Hardening. Heat at a temperature of 1 050 10 C, followed by cooling in air. b) Tempering. Heat at a temperature of 650 5 C, followed by
13、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. If a stress relieving treatment is applied this shall be sufficient to restore the proof stress. 7 M
14、echanical properties 7.1 Tensile test at room temperature and impact test. 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 311 HB. 7.2.2 The hardness o
15、f material, parts and test samples heat treated in accordance with 6.2 shall be: 286 min./331 max. HB or 300 min./350 max. HV Designation Form Condition of supply S151B Black bars for machining Finally heat treated S151D Bright bars for machining Finally heat treated before or after cold drawing or
16、cold rolling or machining or grinding S151A Forging stock and billets and bars for subsequent working Softened S151C Forgings Finally heat treated 0.2 % proof stress Tensile strength Elongation Reduction of area Izod impact min. min. max. min. min. min. MPa MPa MPa % % ftlbf 760 930 1 130 14 40 45 F
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