1、BRITISH STANDARD AEROSPACE SERIES CONFIRMED JULY 1982 BS HC 106:1974 Incorporating Amendment Nos. 1 and 2 Specification for Precipitation hardening chromium-nickel- copper corrosion-resisting steel castings (12501500 MPa) (Cr 16, Ni 4, Cu 3) UDC 629.7:669.1524263 14:669.14.018.298.3:669.14.018.8BSHC
2、106:1974 This British Standard, having been approved by the AerospaceIndustry StandardsCommittee, waspublished under theauthorityofthe ExecutiveBoardon 29November1974 BSI 03-2000 The following BSI references relate to the work on this standard: Committee reference ACE/60 Draft for comment 73/33283 D
3、C ISBN 0 580 08790 5 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 Thi
4、s 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 had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since pu
5、blication Amd. No. Date of issue Comments 3843 May 1982 5049 May 1986 Indicated by a sideline in the marginBSHC106:1974 BSI 03-2000 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 2 7
6、Rectification of defects 2 8 Flaw detection 2ii blankBSHC106:1974 BSI 03-2000 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 Thi
7、s British Standard shall be used in conjunction with the relevant sections 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 in the solution treated condition, unless otherwise agreed between
8、 the purchaser and the founder, in which case the condition required shall be stated on the drawing or order. 5 Heat treatment 5.1 General. The heat treatment shall be as given in5.2 or5.3. NOTEIf the procedure given in5.2 is not acceptable to the purchaser and founder they may use the procedure giv
9、en in5.3. Theprocedure to be used should be stated on the drawing or order. 5.2 Heat treatment I 5.2.1 Solution treatment. Solution treatment shall consist of: a) heating uniformly at a temperature between1020 C and1180 C for not less than1h and cooling to a temperature not exceeding25 C; b) holding
10、 at a temperature not exceeding25 C for not less than24h before further treatment. 5.2.2 Precipitation treatment. Precipitation treatment shall consist of heating uniformly at a temperature between450 C and520 C for not more than4h and cooling in air. 5.2.3 Full heat treatment. Full heat treatment s
11、hall consist of solution treatment in accordance with5.2.1, followed by precipitation treatment in accordance with5.2.2. 5.2.4 Homogenization. Homogenization treatment shall consist of: a) heating uniformly at a temperature between1135 C and1165 C for not less than90min and cooling in air to a tempe
12、rature not exceeding25 C; b) holding at a temperature not exceeding25 C for not less than24h before further treatment. Re-melting stock Sections 1 and 2 Precision castings Sections 1 and 3 Sand castings Sections 1 and 4 Centrifugal castings Sections 1 and 5 Element % min. max. Carbon 0.08 Silicon 1.
13、0 Manganese 1.0 Phosphorus 0.04 Sulphur 0.04 Chromium 15.0 17.5 Copper 2.0 3.0 Niobium + Tantalum 0.4 Nickel 3.0 5.0BSHC106:1974 2 BSI 03-2000 5.3 Heat treatment II 5.3.1 Solution treatment. Solution treatment shall consist of: a) heating uniformly at a temperature between1025 C and1055 C for1h per2
14、5mm of section or for30min, whichever is the greater, and cooling in air to a temperature not exceeding25 C; b) holding at a temperature not exceeding25 C for not less than24h before further treatment. 5.3.2 Precipitation treatment. Precipitation treatment shall consist of heating uniformly at a tem
15、perature between450 C and520 C for not less than90min and not more than4h, and cooling in air to room temperature. 5.3.3 Full heat treatment. Full heat treatment shall consist of homogenization treatment in accordance with5.2.4, followed by solution treatment in accordance with5.3.1, followed by pre
16、cipitation treatment in accordance with5.3.2. 6 Mechanical properties 6.1 Tensile. The tensile properties obtained from test pieces representing castings, selected, prepared and tested in accordance with the relevant requirements of BSHC100, shall be: NOTEInformation on SI units is given in BS3763 “
17、The International System of units (SI)”, and BS350 “Conversion factors andtables”. 6.2 Hardness. The hardness of castings fully heat treated in accordance with5.3 and of their representative test samples shall be not less than375HB, 395HV or40HRC. 7 Rectification of defects 7.1 Correction of distort
18、ion. When permitted in accordance with BSHC100, Section 1, distortion can best be corrected after solution treatment in accordance with5.1. If required by the drawing or order, castings shall subsequently be subjected to the precipitation treatment in accordance with5.2. 7.2 Repair of castings by we
19、lding. When repair by welding is permitted in accordance with BSHC100, Section 1, this shall be carried out after solution treatment and castings shall subsequently be re-solution treated and precipitation treated. 8 Flaw detection The chemical composition of this steel is such that spurious indicat
20、ions may result from magnetic methods of flaw detection, therefore penetrant or other non-magnetic methods shall be used. 0.2% proof stress Tensile strength Elongation Reduction of area min. min. max. min. min. MPa (=N/mm 2 ) MPa (=N/mm 2 ) MPa (=N/mm 2 ) % % 1 030 1 250 1 500 8 20blankBS HC 106:197
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