1、BRITISH STANDARD AEROSPACE SERIES CONFIRMED March 1991 BS3T 60:1980 (Superseding BS2T60) Specification for Chromium- molybdenum steel tube(1150MPa) (Maximum thickness8mm) UDC 629.7:669.152628-194-462BS3T60:1980 This BritishStandard, having been prepared under the directionof the Aerospace Standards
2、Committee, waspublished under the authorityof the Executive Boardon 29 February1980 It comes into effect (seenote1) on 30 May1980 BSI02-2000 The following BSI references relate to the work on this standard: Committee reference ACE/15 Draft for comment78/77607DC ISBN 0 580 11170 9 A British Standard
3、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, an i
4、nside front cover, pagesi andii, page1 anda 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 CommentsBS3T60:198
5、0 BSI 02-2000 i Contents Page 1 Inspection and testing procedure 1 2 Process of manufacture 1 3 Chemical composition 1 4 Surface dressing 1 5 Condition 1 6 Final heat treatment 1 7 Decarburization 1 8 Mechanical properties 1ii blankBS3T60:1980 BSI 02-2000 1 NOTE 1Attention is drawn to the fact that
6、this BritishStandard does not come into effect until3 months after the date of publication. This is to enable users of the standard to obtain copies and make the necessary amendments to their documentation before the effective date. NOTE 2Tube of the same composition at lower strength levels is cove
7、red by BritishStandard T53 (for tube of outside diameter not less than12.5mm), T76 and T77. 1 Inspection and testing procedure 1.1 General. This BritishStandard shall be used in conjunction with sections 1and 2 of the latest issue of BS T100. 1.2 Sulphur printing or deep etching tests. One sample sh
8、all be taken from each ingot for sulphur printing or deep etching tests. 2 Process of manufacture The steel shall be manufactured by an electric process. 3 Chemical composition The steel shall contain: 4 Surface dressing The steel shall be overall dressed. 5 Condition The tube shall be supplied in t
9、he finally heat treated condition. 6 Final heat treatment The final heat treatment shall consist of the following: a) Hardening. Heat uniformly at a temperature between870 C and910 C, followed by quenching in oil or water. b) Tempering. Heat uniformly at a temperature of not less than350 C, followed
10、 by cooling in a suitable manner. 7 Decarburization The depth of decarburization, at either of the surfaces, shall be not greater than0.1mm or2% of the nominal thickness, whichever is the lesser. 8 Mechanical properties 8.1 Tensile test. The mechanical properties obtained from test pieces, selected,
11、 prepared and tested in accordance with the relevant requirements of T100, shall be as follows. 8.2 Hardness test. The hardness of the tube shall be: 341min./401max. HB or 350min./425max. HV Element % min. max. Carbon Silicon Manganese Phosphorus Sulphur Chromium Molybdenum Nickel 0.22 015 0.5 0.9 0
12、.15 0.29 0.35 0.8 0.020 0.015 1.2 0.25 0.30 0.2% proof stress Tensile strength Elongation min. min. max. min. MPa (= N/mm 2 ) MPa (= N/mm 2 ) MPa (= N/mm 2 ) % 1 050 1 150 1 350 6 NOTEInformation on SI units is given in BS3763“TheInternational System of units (SI)” and BS350“Conversion factors and t
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