1、BRITISH STANDARD AEROSPACE SERIES CONFIRMED JULY 1982 BSHC 10:1974 (Superseding, in part, Ministry of Defence specifications DTD705 and DTD5072) Incorporating Amendment No.1 Specification for Nickel-chromium- molybdenum steel castings (11501300MPa) UDC629.7:669.1524262814BSHC10:1974 This BritishStan
2、dard, having been approved by the AerospaceIndustry StandardsCommittee, waspublished under theauthoritythe ExecutiveBoard on 10May1974 BSI02-2000 The following BSI references relate to the work on this standard: Committee reference ACE/60 Draft for comment72/35126 DC ISBN 0 580 08402 7 A British Sta
3、ndard 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 front cover
4、, an inside front cover, pagesi andii, pages1 and2 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 issue Comme
5、nts 3847 May 1982 Indicated by a sideline in the marginBSHC10:1974 BSI 02-2000 i Contents Page 1 Special foundry approval 1 2 Inspection and testing procedure 1 3 Chemical composition 1 4 Condition 1 5 Heat treatment 1 6 Mechanical properties 1 7 Rectification of defects 2ii blankBSHC10:1974 BSI 02-
6、2000 1 1 Special foundry approval Manufacture of castings to this specification may be restricted to foundries specially approved in accordance with the requirements of BSHC100, Section 1. 2 Inspection and testing procedure This BritishStandard shall be used in conjunction with the relevant sections
7、 of the latest issue of BSHC100 as follows: 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 between88
8、0 C and960 C. 5.2 Hardening. Heat uniformly at a temperature between830 C and910 C and quench in oil. 5.3 Tempering. Heat uniformly at a temperature between450 C and560 C. 6 Mechanical properties 6.1 Tensile and impact. The tensile and impact properties obtained from test pieces representing casting
9、s, selected, prepared and tested in accordance with the relevant requirements of BSHC100, shall be: NOTEInformation on SI units is given in BS3763, “The International System of units (SI)”, and BS350, “Conversion factors and tables”. Re-melting stock Sections1 and2 Precision castings Sections1 and3
10、Sand castings Sections1 and4 Centrifugal castings Sections1 and5 Element % min. max. Carbon Silicon Manganese Phosphorus Sulphur Chromium Copper Molybdenum 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 stress Tensile strength Elongation Reduction of area Izod im
11、pact min. min. max. min. min. min. MPa (N/mm 2 ) MPa (N/mm 2 ) MPa (N/mm 2 ) % % ft lbf 940 1150 1300 5 14 10BSHC10:1974 2 BSI 02-2000 6.2 Hardness. The hardness of hardened and tempered castings and their representative test samples shall be: 7 Rectification of defects 7.1 Correction of distortion.
12、 When permitted in accordance with BSHC100 distortion shall be corrected after annealing and castings shall subsequently be hardened and tempered. 7.2 Repair of castings by welding. When repair by welding is permitted in accordance with BSHC100, this shall be carried out after annealing and castings
13、 shall subsequently be hardened and tempered. min. max. HB HV HRC 331 335 35 401 425 42blankBSHC 10:1974 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 Eu
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