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1、BRITISH STANDARD AEROSPACE SERIES CONFIRMED JULY 1982 BS HC 9:1974 (Superseding, in part, Ministry of Defence specifications DTD 666 and DTD 5172) Incorporating Amendment No. 1 Specification for Nickel-chromium- molybdenum steel castings (880 1080 MPa) UDC 629.7:669.15242628 14 Licensed Copy: London
2、 South Bank University, London South Bank University, Sat Dec 09 02:53:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS HC 9:1974 This British Standard, having been approved by the Aerospace Industry Standards Committee, was published under the authority of the Executive Board on 10 May 1974 BSI 02-
3、2000 The following BSI references relate to the work on this standard: Committee reference ACE/60 Draft for comment 72/35126 DC ISBN 0 580 08392 6 A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct a
4、pplication. 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, pages 1 and 2 and a back cover. This standard has been updated (see copyright date) and may have ha
5、d amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.Date of issueComments 3848May 1982Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Sat Dec 0
6、9 02:53:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS HC 9:1974 BSI 02-2000i Contents Page 1Special foundry approval1 2Inspection and testing procedure1 3Chemical composition1 4Condition1 5Heat treatment1 6Mechanical properties1 7Rectification of defects2 Licensed Copy: London South Bank Universi
7、ty, London South Bank University, Sat Dec 09 02:53:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:53:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS HC 9:1974 BSI 02-20001 1 Special foundry approval Man
8、ufacture of castings to this specification may be restricted to foundries specially approved in accordance with the requirements of BS HC 100-1. 2 Inspection and testing procedure This British Standard shall be used in conjunction with the relevant sections of the latest issue of BS HC 100 as follow
9、s: 3 Chemical composition The re-melting stock and the castings shall contain: 4 Condition Castings shall be supplied finally heat treated. 5 Heat treatment The final heat treatment shall be as follows. 5.1 Annealing. Heat uniformly at a temperature between 880 C and 960 C. 5.2 Hardening. Heat unifo
10、rmly at a temperature between 830 C and 910 C and quench in oil or water. 5.3 Tempering. Heat uniformly at a temperature between 510 C and 610 C. 6 Mechanical properties 6.1 Tensile and impact. The tensile and impact properties obtained from test pieces representing castings, selected, prepared and
11、tested in accordance with the relevant requirements of BS HC 100, shall be: Re-melting stockSections 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
12、 Nickel 0.22 0.3 0.3 0.5 0.2 0.5 0.34 0.6 0.8 0.025 0.025 1.3 0.4 0.7 3.0 0.2 % proof stressTensile strengthElongationReduction of areaIzod impact min.min.max.min.min.min. MPa (N/mm2)MPa (N/mm2)MPa (N/mm2)%ft lbf 7008801 08083030 NOTEInformation on SI units is given in BS 3763, “The International Sy
13、stem of units (SI)”, and BS 350, “Conversion factors and tables”. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:53:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS HC 9:1974 2 BSI 02-2000 6.2 Hardness. The hardness of hardened and tempered castings and thei
14、r representative test samples shall be: 7 Rectification of defects 7.1 Correction of distortion. When permitted in accordance with BS HC 100. distortion shall be corrected after annealing and castings shall subsequently be hardened and tempered. 7.2 Repair of castings by welding. When repair by weld
15、ing is permitted in accordance with BS HC 100, this shall be carried out after annealing and castings shall subsequently be hardened and tempered. min.max. HB HV HRC 262 265 27 321 330 34 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:53:23 GMT+00:00 2006, U
16、ncontrolled Copy, (c) BSI blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:53:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS HC 9:1974 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body respo
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