1、BRITISH STANDARD AEROSPACE SERIES BS 5S 82:1976 (Superseding BS 4S 82) Incorporating Amendment Nos. 1, 2 and 3 Specification for 4%ni cke l-ch ro miu m- molybdenum case-hardening steel billets, bars, forgings and parts (1 3201 520 MPa) UDC 629.7:669.15 24 26 28:669.14.018.298.2 BS 5S 82:1976 This Br
2、itish 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 com
3、ment 74/74367 DC and draft for approval ISBN 0 580 08799 9 Amendments issued since publication Amd. No. Date Comments 2217 February 1977 3532 August 1981 14161 30 May 2003 Indicated by a sidelineBS 5S 82:1976 BSI 30 May 2003 i Contents Page Foreword ii 1 Inspection and testing procedure 1 2 Manufact
4、ure 1 3 Chemical composition 1 4 Surface dressing 1 5 Condition 1 6 Heat treatment 2 7 Mechanical properties 2BS 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. Complian
5、ce with a British Standard 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 whe
6、n the document was last issued. Sidelining in this document indicates the most recent changes by amendment.BS 5S 82:1976 BSI 30 May 2003 1 NOTE The specified chemical composition, heat treatment and tensile properties comply with AECMA Recommendation FE-PL79 (for material heat treated to a tensile s
7、trength of 1 3201 520 MPa). 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 prin
8、ting or deep etching tests. 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
9、overall dressed. 5 Condition 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 condition sections 1 and 2 Forging stock and billets and bars for subsequen
10、t working sections 1 and 5 Forgings sections 1 and 6 Parts finally heat treated after machining sections 1 and 7 Element % min. max. Carbon 0.14 0.18 Silicon 0.15 0.40 Manganese 0.25 0.55 Phosphorus 0.025 Sulphur 0.020 Chromium 1.0 1.4 Molybdenum 0.20 0.30 Nickel 3.8 4.3 Designation Form Condition o
11、f supply S82B Black bars for machining Normalized and softened S82D Bright bars for machining Normalized and softened and subsequently cold drawn, cold rolled, machined or ground S82A Forging stock and billets and bars for subsequent working Softened S82C Forgings Normalized and softenedBS 5S 82:197
12、6 2 BSI 30 May 2003 6 Heat treatment 6.1 Normalizing 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
13、by cooling in air. 6.3 Final heat treatment 6.3.1 Except 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 i
14、n oil. NOTE A sub-zero treatment at 60 C to 80 C is recommended 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. NOTE If an alterna
15、tive heat treatment is used for parts, it may be necessary 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 dia
16、meter or square before heat treatment, shall be as follows: 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 stress Tensile strength Elongation Reduction of area Izod impact min. min. max. m
17、in. min. min. MPa MPa MPa % % ft lbf 1 030 1 320 1 520 8 35 25blankBS 5S 82:1976 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the inte
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