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1、BRITISH STANDARD AEROSPACE SERIES OBSOLESCENT SEPTEMBER 1999 BS HC 4:1973 (Superseding Ministry of Defence Specification DTD 5229) Specification for 3 % chromium- molybdenum steel castings (620770 N/mm2) UDC 629.7:669.152628 14 Licensed Copy: London South Bank University, London South Bank Universit
2、y, Sat Dec 09 02:53:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS HC 4:1973 This British Standard, having been approved by the Aerospace Industry Standards Committee, was published under the authority of the Executive Board on 9 March 1973 BSI 02-2000 The following BSI references relate to the wo
3、rk on this standard: Committee reference ACE/60 Draft for comment 72/31212 DC ISBN 0 580 07871 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 doe
4、s not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, page 1 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the
5、amendment table on the inside front cover. Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:53:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS HC 4:1973 BSI 02-2000i Contents Page 1Inspection and testin
6、g procedure1 2Chemical composition1 3Condition1 4Heat treatment1 5Mechanical properties1 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:53:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: London South Bank University, London South Bank U
7、niversity, Sat Dec 09 02:53:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS HC 4:1973 BSI 02-20001 1 Inspection and testing procedure This specification shall be used in conjunction with the relevant sections of BS HC 100 as follows: 2 Chemical composition The re-melting stock and the castings shal
8、l contain: 3 Condition Castings shall be supplied finally heat treated. 4 Heat treatment 4.1 Hardening. Heat uniformly at a temperature between 880 C and 910 C and cool in a suitable manner. 4.2 Tempering. Heat uniformly at a temperature between 570 C and 700 C. 5 Mechanical properties 5.1 Tensile a
9、nd impact. The tensile and impact properties obtained from test pieces representing castings, selected, prepared and tested in accordance with the relevant requirements of BS HC 100, shall be: 5.2 Hardness. The hardness of finally heat treated castings and test pieces shall be: Re-melting stockSecti
10、ons 1 and 2 Precision castingsSections 1 and 3 Sand castingsSections 1 and 4 Centrifugal castingsSections 1 and 5 Element % min.max. Carbon Silicon Manganese Phosphorus Sulphur Chromium Copper Molybdenum 0.3 0.3 2.5 0.35 0.25 0.75 0.6 0.035 0.035 3.5 0.3 0.6 0.2 % proof stress Tensile strength Elong
11、ationIzod impact N/mm2N/mm2%ft lbf min.min.max.min.min. 4806207701425 NOTE1 N/mm2= 1 MN/m2= 1 MPa. Information on SI units is given in BS 3763, “The International System of units (SI)” and BS 350, “Conversion factors and tables”. min.max. HB179229 HV175235 HRB8899 Licensed Copy: London South Bank Un
12、iversity, London South Bank University, Sat Dec 09 02:53:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS HC 4:1973 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
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21、rior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel: 020 8996 7070. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:53:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI