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1、BRITISH STANDARD AEROSPACE SERIES BS 5S 82:1976 (Superseding BS 4S 82) Incorporating Amendment Nos. 1, 2 and 3 Specification for 4 % nickel-chromium- molybdenum case-hardening steel billets, bars, forgings and parts (1 3201 520 MPa) UDC 629.7:669.15242628:669.14.018.298.2 ? BS 5S 82:1976 This Britis
2、h Standard, having been prepared under the direction of the Aerospace Industry Standards Committee, was published under the authority of the Executive Board on 31 March 1976 BSI 30 May 2003 The following BSI references relate to the work on this standard: Committee reference ACE 15 Draft for comment
3、 74/74367 DC and draft for approval ISBN 0 580 08799 9 Amendments issued since publication Amd. No.DateComments 2217February 1977 3532August 1981 1416130 May 2003Indicated by a sideline BS 5S 82:1976 BSI 30 May 2003 i Contents Page Forewordii 1Inspection and testing procedure1 2Manufacture1 3Chemica
4、l composition1 4Surface dressing1 5Condition1 6Heat treatment2 7Mechanical properties2 BS 5S 82:1976 ii BSI 30 May 2003 Foreword This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Stand
5、ard does not of 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. The BSI copyright notice displayed in this document indicates when the document was last
6、 issued. Sidelining in this document indicates the most recent changes by amendment. BS 5S 82:1976 BSI 30 May 2003 1 NOTEThe specified chemical composition, heat treatment and tensile properties comply with AECMA Recommendation FE-PL79 (for material heat treated to a tensile strength of 1 3201 520 M
7、Pa). 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 or deep etching te
8、sts. 1.3 Ultrasonic examination. The material shall be ultrasonically tested in accordance with BS S 100, Annex B. 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 Cond
9、ition 5.1 The material shall be supplied in the appropriate condition stated below: 5.2 Parts shall be supplied finally heat treated. Bars for machining delivered in other than the finally heat treated conditionsections 1 and 2 Forging stock and billets and bars for subsequent workingsections 1 and
10、5 Forgingssections 1 and 6 Parts finally heat treated after machiningsections 1 and 7 Element% min.max. Carbon0.140.18 Silicon0.150.40 Manganese0.250.55 Phosphorus0.025 Sulphur0.020 Chromium1.01.4 Molybdenum0.200.30 Nickel3.84.3 DesignationFormCondition of supply S82BBlack bars for machiningNormaliz
11、ed and softened S82DBright bars for machiningNormalized and softened and subsequently cold drawn, cold rolled, machined or ground S82AForging stock and billets and bars for subsequent working Softened S82CForgingsNormalized and softened BS 5S 82:1976 2 BSI 30 May 2003 6 Heat treatment 6.1 Normalizin
12、g treatment. The normalizing treatment shall consist of heating uniformly at a temperature between 910 C and 930 C. 6.2 Softening treatment. The softening treatment shall consist of heating uniformly at a temperature of not less than 630, followed by cooling in air. 6.3 Final heat treatment 6.3.1 Ex
13、cept as provided in 6.3.2, the final heat treatment shall consist of the following: a) Carburizing or blank carburizing. Heat uniformly at a temperature between 880 C and 930 C. b) Hardening. Heat at a temperature of 825 10 C, followed by cooling in oil. NOTEA sub-zero treatment at 60 C to 80 C is r
14、ecommended before tempering. c) Tempering. Heat at a temperature of 190 5 C, followed by cooling in air. 6.3.2 Alternatively to 6.3.1, the final heat treatment of parts shall be agreed between the manufacturer and the purchaser. NOTEIf an alternative heat treatment is used for parts, it may be neces
15、sary to agree alternative mechanical properties. 7 Mechanical properties 7.1 Tensile test at room temperature and impact test. The mechanical properties obtained from test pieces, machined from test samples reduced, where applicable, to 20 mm diameter or square before heat treatment, shall be as fol
16、lows: 7.2 Hardness test. The hardness of material heat treated in accordance with 6.1 and 6.2, or 6.2, as appropriate, shall be not greater than 277 HB. 0.2 % proof stressTensile strengthElongationReduction of areaIzod impact min.min.max.min.min.min. MPa MPa MPa %ft lbf 1 0301 3201 52083525 blank BS
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