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1、BRITISH STANDARD AEROSPACE SERIES BS HC 6:1973 (Superseding Ministry of Defence Specification DTD 5249) Specification for 3 % chromium- molybdenum nitriding steel castings (8501000 N/mm2) UDC 629.7:669.152628 14:669.14.018.298.2 Licensed Copy: London South Bank University, London South Bank Universi
2、ty, Sat Dec 09 02:53:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS HC 6:1973 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 12-1999 The following BSI references relate to the w
3、ork on this standard: Committee reference ACE/60 Draft for comment 72/31212 DC ISBN 0 580 07891 4 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 do
4、es 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 02:53:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS HC 6:1973 BSI 12-1999i Contents Page 1Special foundry appr
6、oval1 2Inspection and testing procedure1 3Chemical composition1 4Condition1 5Heat treatment1 6Mechanical properties1 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:53:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: London South Bank Uni
7、versity, London South Bank University, Sat Dec 09 02:53:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS HC 6:1973 BSI 12-19991 1 Special foundry approval Manufacture of castings to this specification may be restricted to foundries specially approved in accordance with BS HC 100, 1.1. 2 Inspection a
8、nd testing procedure This specification shall be used in conjunction with the relevant sections of BS HC 100 as follows: 3 Chemical composition The re-melting stock and the castings shall contain: 4 Condition Castings shall be supplied heat treated in accordance with 5.1. 5 Heat treatment 5.1 The fi
9、nal heat treatment shall be: 5.1.1 Annealing. Heat uniformly at a temperature between 880 C and 910 C. 5.1.2 Hardening. Heat uniformly at a temperature between 880 C and 910 C and quench in oil. 5.1.3 Tempering. Heat uniformly at a temperature between 570 C and 700 C. 5.2 If required by the purchase
10、r, finally heat treated casting shall be subjected to one or more stabilizing treatments at a temperature of not less than 520 C. 5.3 The portions of test samples reserved for additional impact tests as required by BS HC 100 shall accompany the castings they represent through the stabilizing treatme
11、nt and nitriding cycle. 6 Mechanical properties 6.1 Tensile and 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: NOTE 1N/mm2= 1 MN/m2= 1 MPa. Information on SI
12、 units is given in BS 3763, “The International System of units (SI)” and BS 350, “Conversion factors and tables”. 6.2 Hardness 6.2.1 The hardness of hardened and tempered castings and their representative test samples shall be: 6.2.2 The hardness of the nitrided case shall comply with the drawing re
13、quirements. Re-melting stockSections 1 and 2 Precision castingsSections 1 and 3 Sand castingsSections 1 and 4 Element% min.max. Carbon0.200.30 Silicon0.30.75 Manganese0.30.6 Phosphorus0.020 Sulphur0.020 Chromium2.93.5 Copper0.3 Molybdenum0.40.7 Nickel0.4 Tin0.03 Vanadium0.02 0.2 % proof stress Tensi
14、le strengthElongation Izod impact N/mm2N/mm2%ft lbf min.min.max.min.min. 6008501 000815 min.max. HB248302 HV255320 HRC2231 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:53:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS HC 6:1973 BSI 389 Chiswick High Road
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