1、BRITISH STANDARD AEROSPACE SERIES CONFIRMED AUGUST 1985 BS 2S 146:1976 (Superseding BS S 146) Incorporating Amendment No. 1 Specification for 4% nickel-chromium- molybdenum air-hardening steel (vacuum arc remelted) billets, bars, forgings and parts (17601960 MPa: limiting ruling section100mm) UDC 62
2、9.7:669.15242628-194-4:669.14.018.298.3BS2S146:1976 This British Standard, having been prepared under the directionof the Aerospace Standards Committee, was published under the authority ofthe Executive Board on 30 November 1976 BSI 01-2000 The following BSI references relate to the work on this sta
3、ndard: Committee reference ACE/15 Draft for comment 75/74998DC ISBN 0 580 09498 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
4、 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 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendmen
5、t table on the inside front cover. Amendments issued since publication Amd. No. Date of issue Comments 3524 August 1981 Indicated by a sideline in the marginBS2S146:1976 BSI 01-2000 i Contents Page 1 Inspection and testing procedure 1 2 Manufacture 1 3 Chemical composition 1 4 Surface dressing 1 5 C
6、ondition 2 6 Heat treatment 2 7 Mechanical properties 2ii blankBS2S146:1976 BSI 01-2000 1 NOTEThe Specified chemical composition complies with AECMA Recommendation FE-PL 78. 1 Inspection and testing procedure 1.1 General. This British Standard shall be used in conjunction with the relevant sections
7、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 end of each ingot for sulphur printing or deep etching tests. 1.3 Ultrasonic examination. Billets and bars and, where practicable, forgings shall be subjected to ultrasonic exa
8、mination. 2 Manufacture The material shall be manufactured by consumable electrode vacuum arc remelting. 3 Chemical composition The steel shall contain: 4 Surface dressing The material shall be overall dressed. Bars for machining delivered in other than the finallyheat treated condition sections 1 a
9、nd 2 Forging stock and billets and bars for subsequent working sections 1 and 5 Forgings sections 1 and 6 Parts finally heat treated after machining sections 1 and 7 Element % min. max. Carbon 0.34 0.42 Silicon 0.15 0.35 Manganese 0.15 0.60 Phosphorus 0.015 Sulphur 0.0l0 Chromium 1.6 2.0 Molybdenum
10、0.40 0.60 Nickel 3.5 4.5BS2S146:1976 2 BSI 01-2000 5 Condition 5.1 The material shall be supplied in the appropriate condition stated below: 5.2 Parts shall be supplied finally heat treated. 6 Heat treatment 6.1 Softening treatment. The softening treatment shall consist of heating uniformly at a tem
11、perature of not less than 630 C. 6.2 Final heat treatment. The final heat treatment shall consist of the following: a) Hardening. Heat at a temperature of 875 10 C, followed by cooling in still air, followed immediately by b). b) Sub-zero treatment. Hold at a temperature between70 C and80 C for not
12、less than 2 h. c) Tempering. Heat uniformly at a temperature between180 C and220 C, followed by cooling in air. 7 Mechanical properties 7.1 Tensile test at room temperature and impact test 7.1.1 Except as provided in 7.1.2, the mechanical properties obtained from test pieces, heat treated at test pi
13、ece size, shall be as follows: 7.1.2 Alternatively to 7.1.1, the mechanical properties obtained from transverse test pieces, heat treated at test piece size, shall be as follows: NOTEInformation on SI units is given in BS 3763 “The International System of units (SI)” and BS 350 “Conversion factors a
14、nd tables”. 7.2 Hardness test 7.2.1 The hardness of material heat treated in accordance with 6.1 shall be not greater than302 HB. 7.2.2 The hardness of material, parts and test samples heat treated in accordance with 6.2 shall be not less than 530 HV. Designation Form Condition of supply S146B Black
15、 bars for machining Softened S146D Bright bars for machining Softened and subsequently cold drawn, cold rolled, machined or ground S146A Forging stock and billets and bars for subsequent working Softened S146C Forgings Softened 0.2 % proof stress Tensile strength Elongation Reduction of area Izod im
16、pact min. min. max. min. min. min. MPa (= N/mm 2 ) MPa (= N/mm 2 ) MPa (= N/mm 2 ) % % ft lbf 1420 1760 1960 8 35 15 0.2 % proof stress Tensile strength Elongation Reduction of area Izod impact min. min. max. min. min. min. MPa (= N/mm 2 ) MPa (= N/mm 2 ) MPa (= N/mm 2 ) % % ft lbf 1420 1760 1960 6
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