1、BRITISH STANDARD AEROSPACE SERIES BS 2S 136:1977 (Superseding BS S 136) Incorporating Amendment No. 1 Specification for 1 % carbon-chromium steel (vacuum arc remelted) billets, bars, forgings and parts (Limiting ruling section 25 mm) ICS 49.025.10 BS 2S 136:1977 This British Standard, having been pr
2、epared under the direction of the Aerospace Standards Committee, was published under the authority of the Executive Board on 29 April 1977 BSI 9 March 2005 The following BSI references relate to the work on this British Standard: Committee reference ACE/15 Draft for comment 75/76712 DC ISBN 0 580 09
3、602 5 Amendments issued since publication Amd. No. Date of issue Comments 15173 9 March 2005 See ForewordBS 2S 136:1977 BSI 9 March 2005 i Contents Page Foreword ii 1 Inspection and testing procedure 1 2 Manufacture 1 3 Chemical composition 1 4 Surface dressing 1 5 Condition 2 6 Heat treatment 2 7 M
4、echanical properties 2BS 2S 136:1977 ii BSI 9 March 2005 Foreword The start and finish of text introduced or altered by Amendment No. 1 is indicated in the text by tags !“. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct
5、application. Compliance 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 d
6、ocument indicates when the document was last issued.BS 2S 136:1997 BSI 9 March 2005 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 Sulfur printing or deep etching tests One
7、 sample shall be taken from each end of each ingot for sulfur printing or deep etching tests. 1.3 Ultrasonic examination !The material shall be ultrasonically tested in accordance with the latest edition of BS S 100, Annex B. “ 1.4 Decarburization If required, examination for and the amount of decar
8、burization shall be agreed between the manufacturer and the purchaser. 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
9、 in other than the finally heat treated condition Section 1 and Section 2 Forging stock and billets and bars for subsequent working Section 1 and Section 5 Forgings Section 1 and Section 6 Parts finally heat treated after machining Section 1 and Section 7 Element % min. max. Carbon 0.90 1.10 Silicon
10、 0.15 0.40 Manganese 0.25 0.55 Phosphorus 0.015 Sulfur 0.010 Chromium 1.3 1.6 Copper 0.25 Molybdenum 0.1 Nickel 0.4 Vanadium 0.3BS 2S 136:1997 2 BSI 9 March 2005 5 Condition 5.1 The material shall be supplied in the appropriate condition stated below. 5.2 Parts shall be supplied finally heat treated
11、. 6 Heat treatment 6.1 Spheroidizing treatment The spheroidizing treatment shall be as follows: a) heat at a temperature of 820 10 C for not less than 6 h; b) cool to 700 C at a rate not greater than 10 C per hour; c) furnace cool to 500 C; d) air cool or furnace cool to room temperature. 6.2 Soften
12、ing treatment The softening treatment shall consist of heating uniformly at a temperature between 700 C and 750 C for not less than 1 h, followed by cooling in air or furnace. 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) Hard
13、ening. Heat uniformly at a temperature between 820 C and 860 C, followed by cooling in oil. b) Tempering. Heat at a temperature of 165 5 C for 1 h, 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.
14、NOTE If an alternative heat treatment is used for parts, it may be necessary to agree alternative mechanical properties. 7 Mechanical properties 7.1 Hardening test One test sample, 25 mm in diameter and not less than 100 mm long, from each cast shall be heat treated in accordance with 6.3.1. A longi
15、tudinal flat surface suitable for hardness testing shall be prepared on the test sample, not less than 5 % of the diameter or width being removed during preparation. The hardness of the test sample shall be not less than 770 HV or 62 HRC. 7.2 Hardness test 7.2.1 The hardness of material heat treated
16、 in accordance with 6.1 shall be not greater than 207 HB unless the material has been cold worked, in which case it shall be not greater than 248 HB. 7.2.2 The hardness of parts and test samples heat treated in accordance with 6.3.1 shall be not less than 770 HV or 62 HRC. Designation Form Condition
17、 of supply S136B Black bars for machining Spheroidized S136D Bright bars for machining Spheroidized and subsequently cold drawn, cold rolled, machined or ground S136A Forging stock and billets and bars for subsequent working Softened S136C Forgings (including rolled rings) SpheroidizedblankBS 2S 136
18、:1977 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 international level. It is incorporated by Royal Charter. Revisions British Sta
19、ndards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while usi
20、ng this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: +44 (0)20 8996 9000. Fax: +44 (0)20 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers a
21、utomatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: +44 (0)20 8996 9001. Fax: +44 (0)20 8996 7001. Email: ordersbsi-. Standards are also available from the BSI webs
22、ite at http:/www.bsi-. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and
23、international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel: +44 (0)20 8996 7111. Fax: +44 (0)20 8996 7048. Email: info
24、bsi-. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel: +44 (0)20 8996 7002. Fax: +44 (0)20 8996 7001. Email: membershipbsi-.
25、 Information regarding online access to British Standards via British Standards Online can be found at http:/www.bsi- Further information about BSI is available on the BSI website at http:/www.bsi-. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the
26、 publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior writte
27、n permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. Details and advice can be obtained from the Copyright & Licensing Manager. Tel: +44 (0)20 8996 7070. Fax: +44 (0)20 8996 7553. Email: copyrightbsi-.
