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1、BRITISH STANDARD AEROSPACE SERIES BS 2HC 102: 1989 Incorporating Amendment Nos. 1 and 2 Specification for Precipitation hardening chromium-nickel- copper-molybdenum steel castings (1250 MPa) (Cr 14.0, Ni 4.5, Cu 2.5, Mo 1.5) UDC 629.7:669.152624328 14:669.14.018.298 Licensed Copy: sheffieldun sheffi
2、eldun, na, Tue Nov 28 14:22:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2HC 102:1989 This British Standard, having been prepared under the direction of the Aerospace Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 31 January 1990 BSI 12
3、-1999 First published February 1973 First revision January 1990 The following BSI references relate to the work on this standard: Committee reference ACE/15 Draft for comment 87/73939 DC ISBN 0 580 17958 3 Committees responsible for this British Standard The preparation of this British Standard was
4、entrusted by the Aerospace Standards Policy Committee (ACE/-) to Technical Committee ACE/15, upon which the following bodies were represented: British Forging Industry Association British Independent Steel Producers Association British Industrial Fasteners Federation British Investment Casting Trade
5、 Association British Steel Industry British Steel Industry (Wire Section) Civil Aviation Authority (Airworthiness Division) Institute of British Foundrymen Ministry of Defence National Association of Steel Stockholders Rolls-Royce Ltd. Seamless Steel Tube Association Society of British Aerospace Com
6、panies Ltd. Steel Casting Research and Trade Association Amendments issued since publication Amd. No.Date of issueComments 6565May 1990 6705July 1991Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:22:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2HC
7、 102:1989 BSI 12-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Inspection and testing procedure1 3Chemical composition1 4Condition1 5Heat treatment1 6Mechanical properties1 7Rectification of defects2 8Flaw detection2 Table 1 Chemical composition of re-melting stock
8、 and of castings1 Table 2 Tensile and impact properties2 Publication referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:22:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2HC 102:1989 ii BSI 12-1999 Foreword This British Standard having been prepared under the di
9、rection of the Aerospace Standards Policy Committee, is a revision of BS HC 102:1973 which is withdrawn. It also supersedes DTD specification DTD 5309. In this revision, the table of chemical composition and the heat treatment requirements have been modified. The units given in Table 2 for Izod impa
10、ct strength are ft. lbf because Izod testing machines are calibrated in imperial units. 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
11、itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will
12、be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:22:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2HC 102:1989 BSI 12-19991 1 Scope This British Standard specifies requirements for inspection and testing, chemical composition
13、, condition, heat treatment and mechanical properties of precipitation hardening chromium-nickel-copper-molybdenum steel castings having a strength of 1 250 MPa. (Cr 14.0, Ni 4.5, Cu 2.5, Mo 1.5). Requirements are also given for the rectification of defects and the detection of flaws. Manufacture of
14、 castings to this specification may be restricted to foundries specially approved in accordance with 1.1 of BS HC 100. NOTEThe titles of the publication referred to in this standard are given on the inside back cover. 2 Inspection and testing procedure This British Standard shall be used in conjunct
15、ion with the relevant sections of latest issues of BS HC 100 as follows. 3 Chemical composition The chemical composition re-melting stock and the castings shall be as given in Table 1. 4 Condition Castings shall be supplied in the fully heat treated condition unless otherwise agreed between the purc
16、haser and the founder, in which case they shall be supplied in the condition stated on the drawing or order. 5 Heat treatment 5.1 Solution treatment 5.1.1 Heat uniformly at a temperature between 1 020 C and 1 180 C for not less than 2 h and cool temperature at a rate equivalent to air cooling. The m
17、edium shall be at the option of the founder unless otherwise agreed with the purchaser. NOTEIt is advisable for investment castings to be treated in an inert atmosphere. 5.1.2 Hold at a temperature of not more than 25 C for not less than 24 h before further heat treatment. NOTEFor heavy sections it
18、may be necessary to double the solution treatment. Table 1 Chemical composition of re-melting stock and of castings 5.2 Precipitation treatment 5.2.1 Except as provided in 5.2.2 the precipitation treatment shall be as follows. a) Heat uniformly at a temperature between 800 C and 850 C for not less t
19、han 2 h and cool to room temperature at a rate equivalent to air cooling. The medium shall be at the option of the founder unless otherwise agreed with the purchaser. b) Hold at a temperature of not more than 25 C for not less than 2 h before further heat treatment. c) Heat uniformly at a temperatur
20、e between 450 C and 520 C for not more than 4 h and cool in air to room temperature. 5.2.2 Alternatively to 5.2.1, heat uniformly at a temperature between 450 C and 520 C for not more than 4 h and cool to room temperature at a rate equivalent to air cooling. The medium shall be at the option of the
21、founder unless otherwise agreed with the purchaser. Full heat treatment shall consist of solution treatment in accordance with 5.1 followed by precipitation treatment in accordance with either 5.2.1 or 5.2.2. 6 Mechanical properties 6.1 Tensile and impact The tensile and impact properties obtained f
22、rom test pieces representing castings selected, prepared and tested in accordance with the relevant requirements of BS HC 100 shall be as given in Table 2. Re-melting stockSections 1 and 2 Precision castingsSections 1 and 3 Sand castingsSections 1 and 4 Centrifugal castingsSections 1 and 5 ElementCo
23、mposition by mass minimummaximum Carbon Silicon Manganese Phosphorus Sulphur Chromium Copper Molybdenum Niobium Nickel % 0.20 12.5 1.0 0.5 4.0 % 0.07 0.8 1.0 0.020 0.020 15.5 2.5 2.0 0.25 6.0 NOTE 1If it is intended to weld or braze the castings, a restricted composition within the limits specified
24、above may be agreed between the purchaser and the founder. NOTE 2Steels within this composition range are the subject of claims in certain British patent applications. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:22:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2HC 102:1989 2 BSI 12-
25、1999 6.2 Hardness The hardness of the fully heat treated castings shall be not less than 375 HB or 400 HV or 40 HRC. 7 Rectification of defects 7.1 Correction of distortion When permitted in accordance with BS HC 100, distortion shall be corrected after solution treatment and castings shall subseque
26、ntly be precipitation treated. 7.2 Repair of castings by welding When repair by welding is permitted in accordance with BS HC 100, this shall be carried out after solution treatment and castings shall subsequently be precipitation treated. 8 Flaw detection Penetrant or other non-magnetic methods sha
27、ll be used. NOTEThe chemical composition of this steel is such that spurious indications may result from magnetic methods of flaw detection. Table 2 Tensile and impact properties 0.2 % proof stressTensile strengthElongationReduction of areaIzod impact MPaMPa%ftlbf minimum 950 minimum 1 250 maximum 1
28、 500 minimum 8 minimum 15 minimum 8 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:22:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2HC 102:1989 BSI 12-1999 Publication referred to BS HC 100, Inspection and testing procedure for iron, nickel, copper, cobalt and refractory metal base al
29、loy castings. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:22:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2HC 102: 1989 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It pr
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