1、BRITISH STANDARD AEROSPACE SERIES CONFIRMED MARCH 1999 BS 2S 131: 1977 (Superseding BSS131) Incorporating Amendment No. 1 Specification for High thermal expansion steel billets, bars, forgings and parts (620MPa: limiting ruling section150 mm) UDC 629.7:669.14.018.47-4:669.15247426BS2S131:1977 This B
2、ritish Standard, having been prepared under the direction of the Aerospace Standards Committee, was published under the authority ofthe Executive Board on 29April1977 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/15 Draft for comment 75/76712 D
3、C ISBN 0 580 09622 X 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, page1 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 publicatio
5、n Amd. No. Date of issue Comments 3840 December 1981 Indicated by a sideline in the marginBS2S131:1977 BSI 01-2000 i Contents Page 1 Inspection and testing procedure 1 2 Manufacture 1 3 Chemical composition 1 4 Surface dressing 1 5 Condition 1 6 Heat treatment 1 7 Mechanical properties 1ii blankBS2S
6、131:1977 BSI 01-2000 1 1 Inspection and testing procedure 1.1 General. This British Standard shall be used in conjunction with the relevant sections of the latest issue of BS S 100 as follows. 1.2 Sulphur printing or deep etching tests. One sample shall be taken from each ingot for sulphur printing
7、or deep etching tests. 2 Manufacture The material shall be manufactured by an electric process. 3 Chemical composition The steel shall contain: 4 Surface dressing The material shall be overall dressed. 5 Condition 5.1 The material shall be supplied in the appropriate condition stated below. 5.2 Part
8、s shall be supplied finally heat treated. 6 Heat treatment The final heat treatment shall consist of softening by heating uniformly at a temperature between950 C and 1 100 C, followed by cooling in air, oil or water. 7 Mechanical properties 7.1 Tensile test at room temperature. The mechanical proper
9、ties obtained from test pieces shall be not less than the following. NOTEInformation on SI units is given in BS 3763 “The International System of units (SI)” and BS 350 “Conversion factors and tables”. Bars for machining delivered inthe finally heat treated condition sections 1 and 3 Forging stock a
10、nd billets and bars for subsequent working sections 1 and 5 Forgings sections 1 and 6 Parts finally heat treated aftermachining sections 1 and 7 Element % min. max. Carbon Silicon Manganese Phosphorus Sulphur Chromium Molybdenum Nickel Vanadium Tungsten 0.55 0.20 3.5 3.0 11.0 0.70 0.50 5.5 0.035 0.0
11、25 4.0 0.50 14.0 0.25 1.0 Designation Form Condition of supply S131B Black bars for machining Finally heat treated S131D Bright bars for machining Finally heat treated and subsequently cold rolled, machined or ground S131A Forging stock and billets and bars for subsequent working As rolled or forged
12、 S131C Forgings Finally heat treated Tensile strength Elongation Mpa (= N/mm 2 ) % 620 40BS 2S 131: 1977 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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