1、BRITISH STANDARD AEROSPACE SERIES BS HC 301:1973 Specification for Cobalt base chromium-nickel- tungsten alloy castings (Cr 25.5, Ni10.5, W7.5) UDC 629.7:669.25526242714BSHC301:1973 This British Standard, having been approved by the AerospaceIndustry Standards Committee, was published underthe autho
2、rity of the Executive Board on 2February1973 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/60 Draft for comment 71/35555 ISBN 0 580 07188 X A British Standard does not purport to include all the necessary provisions of a contract. Users of Brit
3、ish 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 document comprises a front cover, an inside front cover, pages i and ii, page1 and a back cover. This standard has been upd
4、ated (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 publication Amd. No. Date CommentsBSHC301:1973 BSI 01-2000 i Contents Page 1 Special foundry approval 1 2 Inspection and testing proced
5、ure 1 3 Chemical composition 1 4 Condition 1 5 Mechanical properties 1ii blankBSHC301:1973 BSI 01-2000 1 NOTEThis specification complies with AICMA Recommendation Co-C91-HT, except for the carbon content and the absence of a hardness requirement. 1 Special foundry approval Manufacture of castings to
6、 this specification mayberestricted to foundries specially approved inaccordance with the requirements ofBSHC100,1.1. 2 Inspection and testing procedure This British Standard shall be used in conjunction with the relevant sections of BSHC100 as follows: 3 Chemical composition The re-melting stock an
7、d the castings shall contain: 4 Condition Castings shall be supplied in the as cast condition unless otherwise agreed between the purchaser and the founder, in which case the condition required shall be stated on the drawing or order. 5 Mechanical properties The stress rupture properties obtained fr
8、om test pieces representing re-melting stock and castings, selected, prepared and tested in accordance with the relevant requirements of BS HC 100, shall be: Re-melting stock Sections 1 and 2 Precision castings Sections 1 and 3 Element % min. max. Carbon 0.40 0.55 Silicon 0.5 1.0 Manganese 0.5 1.0 P
9、hosphorus 0.04 Sulphur 0.04 Chromium 24.5 26.5 Iron 2.0 Nitrogen 0.08 Nickel 9.5 11.5 Tungsten 7.0 8.0 Cobalt Remainder Temperature Stress Time to rupture Elongation C N/mm 2 h % min. min. 815 210 15 4 NOTE1 N/mm 2= 1 MN/m 2= 1 MPa. Information on SI units is given in BS 3763, “The International Sys
10、tem of units (SI)”; seealso BS 350, “Conversion factors and tables”.BS HC 301:1973 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the intern
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