1、BRITISH STANDARD OBSOLESCENT FEBRUARY 1999 BS 2S 93:1964 (Replacing BS S 93) Incorporating Amendment No. 1 Specification for aircraft material “40” Carbon steel (Normalized) (35/45 tonf/sq in; limiting ruling section6 in) UDC 629.13.01:699.14 153.95BS2S 93:1964 This British Standard, having been app
2、roved by the Aircraft Industry Standards Committee and endorsed by the Chairman ofthe Engineering Divisional Council, was published under theauthority of the General Council of the Institution on 13July 1964 BSI 04-2000 The following BSI references relate to the work on this standard: Committee refe
3、rence ACE/15 Draft for comment D62/3645 ISBN 0 580 34448 7 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 l
4、egal obligations. Summary of pages This 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 f
5、ront cover. Amendments issued since publication Amd. No. Date of issue Comments 6316 January 1968 Indicated by a sideline in the marginBS2S 93:1964 BSI 04-2000 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、6 Final heat treatment 2 7 Mechanical properties 2ii blankBS2S 93:1964 BSI 04-2000 1 NOTE 1Where metric equivalents are stated the figures in British units are to be regarded as the standard. Where Fahrenheit equivalents are stated, the temperatures in degrees Celsius are to be regarded as the stand
7、ard. The conversions are approximate. More accurate conversions should be based on the tables in BS 350, “Conversion factors and tables”. NOTE 2In place of the customary, but incorrect use of the pound, ton or kilogramme as units of force, the units called pound-force (abbreviation lbf), ton-force (
8、abbreviation tonf) or kilogramme-force (abbreviation kgf) have been used in this standard. These are the forces which, when acting on a body of mass one pound, one ton or one kilogramme respectively, give it an acceleration equal to that of standard gravity. 1 Inspection and testing procedure 1.1 Th
9、is British Standard shall be used in conjunction with the relevant sections of BS 3S 100 as follows: 1.2 Sulphur printing or deep etching tests. Samples shall be selected in accordance with BS 3S 100, Section1, Clause 7.2.2. 2 Process of manufacture 2.1 The material shall be manufactured by an open
10、hearth or an electric process, unless otherwise agreed between the manufacturer and purchaser in accordance with BS 3S 100, Section 1, Clause 3.1. 3 Chemical composition 3.1 The steel shall contain: 4 Surface dressing The material shall be locally dressed in accordance with the requirements of BS 3S
11、 100, Section 1, Clause5.2. 5 Condition The material shall be supplied in the appropriate condition stated below unless otherwise agreed between the manufacturer and the purchaser in which case the condition in which the material is to be supplied shall be stated on the order. Bars for machining del
12、iveredin the finally heattreated condition Sections 1 and 3. Billets and bars for forging Sections 1 and 5. Forgings Sections 1 and 6. Element Per cent min. max. Carbon 0.35 0.45 Silicon 0.10 0.35 Manganese 0.6 0.9 Sulphur 0.040 Phosphorus 0.040 Designation Material Condition of supply S.93B Black b
13、ars for machining Finally heat treated S.93D Bright bars for machining Finally heat treated and cold drawn orcoldrolled ormachined orground before or afterfinal heat treatment S.93A Billets and bars for forging As rolled or forged S.93C Forgings Finally heat treated BS2S 93:1964 2 BSI 04-2000 6 Fina
14、l heat treatment The final heat treatment shall be: Normalize at a temperature between 830 C and 860 C (1 530 F and 1 580 F). 7 Mechanical properties 7.1 Mechanical tests. The mechanical properties obtained from test pieces selected and prepared in accordance with the relevant requirements of BS 3S
15、100 shall be: NOTE 1The 0.1 per cent proof stress is expected to be not less than 20 tonf/sq in (31 kgf/mm 2 ). NOTE 2These properties are based on a steel with a controlled McQuaid-Ehn grain size of 5 to 8. 7.2 Hardness. The hardness of finally heat treated material and parts shall be: 152 min./217
16、 max. HB. or 160 min./230 max. HV. 7.3 Reverse bend test. Round, square and hexagonal bars under ! inch diameter or minor sectional dimension and flat bars under ( inch minor sectional dimension shall be reverse bend tested in accordance with BS 3S 100, Section 1, Clause 16. 0.2 per cent proof stres
17、s Tensile strength Impact Elongation percent on gaugelength Up to and including 4in ruling section Over 4 in ruling section tonf/sq in kgf/mm 2 tonf/sq in kgf/mm 2 5.65 S 0 ft lbf ft lbf min. min. min. max. min. max. min. min. min. 20 31 35 45 55 71 15 20 15blankBS 2S 93:1964 BSI 389 Chiswick High R
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