1、BRITISH STANDARD AEROSPACE SERIES BS S 538:1975 (Superseding Ministry of Defence Specification DTD 5046) Incorporating Amendment No. 1 Specification for Chromium-nickel- molybdenum-vanadium heat-resisting steel sheet and strip (9301 130 MPa: maximum thickness 6 mm) (Cr 12, Ni 2.5, Mo 1.7, V 0.3) ICS
2、 49.025.10 BS S 538:1975 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 9 December 2003 The following BSI references relate to the work on this standard: Committee reference
3、ACE/15 Draft for comment 73/32574 DC ISBN 0 580 08922 3 Foreword 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 confer immunity from legal obligations. S
4、ummary 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 copyright notice displayed in this document indicates whene the document was last issued. Sidelining in this document indicates the most recent chan
5、ges by amendment. Amendments issued since publication Amd. No. Date Comments 14602 9 December 2003 Indicated by a sidelineBS S 538:1975 BSI 9 December 2003 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 treatmen
6、t 2 7 Mechanical properties 2ii blankBS S 538:1975 BSI 9 December 2003 1 1 Inspection and testing procedure 1.1 General. This British Standard shall be used in conjunction with the relevant sections of the latest edition of BS S 500. 1.2 Thickness. The thickness of the material shall be in accordanc
7、e with the latest edition of BS S 500. Material which has been finally hot rolled prior to softening shall satisfy the tolerances applicable to hot-rolled sheet and strip. Material which has been finally cold rolled prior to softening shall satisfy the tolerances applicable to cold-rolled sheet and
8、strip. 1.3 Sulfur printing or deep etching tests. Samples shall be selected in accordance with the latest edition of BS S 500. 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 dre
9、ssed. 5 Condition The material shall be supplied in the appropriate condition stated below: 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 0.040 Nominal thicknes
10、s Condition of supply mm Up to and including 3 Cold rolled, softened and descaled NOTE Descaling may be omitted if softening is carried out in a suitable protective atmosphere. Over 3 up to and including 6 Hot rolled, softened and descaledBS S 538:1975 2 BSI 9 December 2003 6 Heat treatment 6.1 Soft
11、ening treatment. The material shall be softened by heating at a temperature of 690 10 C for not less than 6 h, followed by cooling in air or a protective atmosphere. 6.2 Final treatment. The final heat treatment shall be as follows. a) Hardening. Heat at a temperature of 1 050 10 C, followed by cool
12、ing in air. b) Tempering. Heat at a temperature of 650 5 C for 4 h, followed by cooling in air. 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 Single bend test (applicable only to sheet or strip
13、of nominal thickness less than 1.6 mm). The test piece shall be bent at room temperature without cracking through an angle of 180 over a former with a radius equal to twice the nominal thickness of the sheet or strip. 7.3 Hardness test 7.3.1 The hardness of material heat treated in accordance with 6
14、.1 shall be not greater than 325 HV. 7.3.2 The hardness of parts and test samples heat treated in accordance with 6.2 shall be not less than 320 HV nor greater than 380 HV. Nominal thickness 0.2 % proof stress Tensile strength Elongation min. min. max. min. mm MPa MPa MPa % Less than 1.6 1.6 and ove
15、r 760 760 930 930 1 130 1 130 9blankBS S 538:1975 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorpor
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