1、BRITISH STANDARD AEROSPACE SERIES BS HC 202:1973 Incorporating Amendment No.1 Specification for Precipitation hardening nickel base chromium-niobium- molybdenum-iron- tungsten alloy castings (Cr 20.0, Nb 6.6, Mo 6.0, Fe 3.0, W 2.5) UDC 629.7:669.24526242812714:669.245.018.298BSHC202:1973 This Britis
2、h Standard, having been approved by the AerospaceIndustry Standards Committee, was published underthe authority of the Executive Board on 2 February 1973 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/60 Draft for comment 71/35555 ISBN 0 580 071
3、78 2 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 does not of itself confer immunity from legal obligations. Summary of pages This document compr
4、ises 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 amendment table on the inside front cover. Amendments issued since publication Amd. No. Date
5、 Comments 3884 April 1982 Indicated by a sideline in the marginBSHC202:1973 BSI 01-2000 i Contents Page 1 Inspection and testing procedure 1 2 Chemical composition 1 3 Condition 1 4 Heat treatment 1 5 Mechanical properties 1 6 Rectification of defects 1ii blankBSHC202:1973 BSI 01-2000 1 NOTEThis spe
6、cification complies with AICMA Recommendation Ni-C103-HT with the exception of the tensile elongation requirement. 1 Inspection and testing procedure This British Standard shall be used in conjunction with the relevant sections of the latest issue of BSHC100 as follows: 2 Chemical composition The re
7、melting stock and the castings shall contain: 3 Condition Castings shall be supplied in the fully heat treated condition unless otherwise agreed between the purchaser and the founder, in which case the condition required shall be stated on the drawing or order. 4 Heat treatment 4.1 Solution treatme
8、nt. Heat uniformly at a temperature between1080 C and1100 C for8h and cool in air to room temperature. 4.2 Precipitation treatment. Heat at a temperature of750 10 C for16h and cool in air to room temperature. 5 Mechanical properties 5.1 Unless otherwise stated on the order the room temperature tensi
9、le properties obtained from test pieces representing re-melting stock and castings, selected, prepared and tested in accordance with the relevant requirements of BSHC 100, shall be: 5.2 If the order requires a hardness determination to be carried out, it shall be not less than270HB, 280 HV or 28 HRC
10、 6 Rectification of defects 6.1 Correction of distortion. When permitted in accordance with BS HC 100, distortion shall be corrected after solution treatment and castings shall subsequently be precipitation treated. 6.2 Repair of castings by welding. When repair by welding is permitted in accordanc
11、e with BS HC 100, this shall be carried out after solution treatment and castings shall subsequently be precipitation treated. Re-melting stock Sections 1 and 2 Precision castings Sections 1 and 3 Element % min. max. Carbon 0.04 Silicon 0.10 0.4 Manganese 0.10 0.5 Sulphur 0.015 Cobalt 2.0 Copper 0.2
12、 Chromium 19.0 21.0 Iron 2.0 4.0 Lead 0.0020 Molybdenum 5.5 6.5 Niobium + Tantalum 6.2 7.0 Nitrogen 0.06 Silver 0.0005 Tungsten 2.0 3.0 Nickel Remainder 0.2 % proof stress Tensile strength Elongation N/mm 2 N/mm 2 % min. min. min. 480 650 5 NOTE1 N/mm 2= 1 MN/m 2= 1 MPa. Information on SI units is g
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