1、BRITISH STANDARD AEROSPACE SERIES BS HC 206:1975 Incorporating Amendment No. 1 Specification for Precipitation hardening nickel base chromium-cobalt- molybdenum-titanium alloy precision castings (Cr 20, Co 20, Mo 6, Ti 2) UDC 629.7:669.245262528295 14:669.245.018.298BSHC206:1975 This British Standar
2、d, having been approved by the AerospaceIndustry Standards Committee, was published underthe authority of the Executive Board on 30September1975 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/60 Draft for comment 73/38194 DC ISBN 0 580 08915 0 A
3、 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 comprises a
4、 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 of is
5、sue Comments 3881 February 1982 Indicated by a sideline in the marginBSHC206:1975 BSI 01-2000 i Contents Page 1 Inspection and testing procedure 1 2 Manufacture 1 3 Chemical composition 1 4 Condition 1 5 Heat treatment 1 6 Mechanical properties 1 7 Rectification of defects 1ii blankBSHC206:1975 BSI
6、01-2000 1 1 Inspection and testing procedure This British Standard shall be used in conjunction with the relevant sections of the latest issue of BSHC 100 as follows: 2 Manufacture Material intended for the production of re-melting stock or castings shall be melted and cast under vacuum. 3 Chemical
7、composition The re-melting stock and castings shall contain: 4 Condition Castings shall be supplied in the solution treated condition. 5 Heat treatment The final heat treatment shall be as follows. 5.1 Solution treatment. Heat at a temperature of1150 10 C for 2 h in a protective atmosphere and cool
8、to room temperature. 5.2 Precipitation treatment. Heat at a temperature of 800 10 C for 8 h and cool in air to room temperature. 6 Mechanical properties 6.1 Tensile. The tensile properties obtained from test pieces representing castings, selected, prepared and tested in accordance with the relevant
9、requirements of BSHC 100, shall be: NOTEInformation on SI units is given in BS 3763“The International System of units (SI)” and BS 350 “Conversion factors and tables”. 7 Rectification of defects 7.1 Correction of distortion. When permitted in accordance with BS HC 100, distortion shall be corrected
10、after solution treatment. 7.2 Repair of castings by welding. When repairby welding is permitted in accordance with BS HC 100, castings shall subsequently be solution treated. Re-melting stock sections 1 and 2 Precision castings sections 1 and 3 Element % min. max. Carbon 0.04 0.08 Silicon 0.4 Mangan
11、ese 0.6 Sulphur 0.007 Silver a 0.0005 (5 p.p.m.) Bismuth a 0.0001 (1 p.p.m.) Aluminium 0.3 0.6 Cobalt 19.0 21.0 Chromium 19.0 21.0 Copper 0.2 Iron 0.7 Molybdenum 5.6 6.1 Niobium 0.25 Lead a 0.0010 (10 p.p.m.) Titanium 1.9 2.4 Tungsten 0.2 Aluminium + titanium 2.4 2.8 Nickel Remainder NOTEAttention i
12、s drawn to the fact that this alloy composition is the subject of a patent. Re-melting stock can only be manufactured under licence. a To be determined on re-melting stock only. 0.2% proof stress Tensile strength Elongation min. min. min. MPa (= N/mm 2 ) MPa (= N/mm 2 ) % 430 620 12BS HC 206:1975 BS
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