1、BRITISH STANDARD AEROSPACE SERIES BS S 535:1969 (Superseding BS S 519) Incorporating Amendment No. 1 Specification for chromium-molybdenum steel sheet and strip (1 150/1 300 MPa) (suitable for welding) UDC 629.7:669.152628 194 41 BS S 535:1969 This British Standard, having been approved by the Aeros
2、pace Industry Standards Committee was published under the authority of the Executive Board of the Institution on 30 May 1969 BSI 27 May 2003 The following BSI references relate to the work on this standard: Committee reference ACE/15 Draft for comment 67/13801 ISBN 0 580 05419 5 Amendments issued si
3、nce publication Amd. No. Date Comments 14145 27 May 2003 Indicated by a sidelineBS S 535:1969 BSI 27 May 2003 i Contents Page Foreword ii 1 Inspection and testing procedure 1 2 Process of manufacture 1 3 Chemical composition 1 4 Surface dressing 1 5 Condition 1 6 Final heat treatment 1 7 Decarburiza
4、tion 2 8 Mechanical properties 2BS S 535:1969 ii BSI 27 May 2003 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 oblig
5、ations. 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 issued. Sidelining in this document indicates the most
6、 recent changes by amendment.BS S 535:1969 BSI 27 May 2003 1 NOTE Sheet and strip of the same composition at a lower strength level are covered by the latest edition of BS S 534. 1 Inspection and testing procedure 1.1 This British Standard shall be used in conjunction with the relevant sections of t
7、he latest edition of BS S 500. 1.2 The thickness of the material shall be in accordance with the latest edition of BS S 500. Material which has been finally hot rolled prior to softening or hardening and tempering shall satisfy the tolerances applicable to hot-rolled sheet and strip. Material which
8、has been finally cold rolled prior to softening or hardening and tempering shall satisfy the tolerances applicable to cold-rolled sheet and strip. 1.3 Sulphur printing or deep etching tests. Samples shall be selected in accordance with the latest edition of BS S 500. 2 Process of manufacture The mat
9、erial shall be manufactured by an electric process, unless otherwise agreed between the manufacturer and the purchaser in accordance with the latest edition of BS S 500. 3 Chemical composition The steel shall contain: 4 Surface dressing The material shall be overall dressed in accordance with the re
10、quirements of the latest edition of BS S 500. 5 Condition 5.1 The material shall be supplied in one of the following conditions after hot or cold rolling: 1) Softened. 2) Hardened and tempered. 5.2 The condition required shall be stated on the order. Unless otherwise agreed the method of rolling sha
11、ll be at the option of the manufacturer but shall be stated in the release note. 5.3 Finished parts shall be supplied finally heat treated. 6 Final heat treatment The final heat treatment shall be: 1) Harden in oil or water from a temperature of 870 10 C. 2) Temper at a temperature of not less than
12、350 C. Element % min. max. Carbon 0.22 0.29 Silicon 0.15 0.35 Manganese 0.50 0.80 Phosphorus 0.020 Sulphur 0.015 Chromium 0.90 1.20 Molybdenum 0.15 0.25 Nickel 0.30BS S 535:1969 2 BSI 27 May 2003 7 Decarburization The decarburization determined in accordance with the latest edition of BS S 500, shal
13、l be not more than 0.04 mm (0.0015 in.) 8 Mechanical properties 8.1 The mechanical properties obtained from test pieces selected and prepared in accordance with the relevant requirements of the latest edition of BS S 500 shall comply with the following: 8.1.1 Tests in the softened condition 1) Hardn
14、ess. The hardness of the material shall be not more than 174 HB or 185 HV. 2) Single bend test. The test piece shall be bent without cracking through an angle of 180 over a former with a radius equal to half the nominal thickness of the sheet or strip. 8.1.2 Tests in the hardened and tempered condit
15、ion 1) Tensile test. 2) Hardness test for finally heat treated parts: The hardness of the material shall be: 341 min/388 max HB; or 360 min/410 max HV. 0.2 % proof stress Tensile strength Elongation on thickness Less than 1.5 mm 1.5 to 3.0 mm Over 3.0 mm MPa MPa % % % min. min. max. min. min. min. 1
16、 000 1 150 1 300 4 5 6blankBS S 535:1969 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 incorporated by R
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