BS-B-28-1991.pdf

BRITISH STANDARD AEROSPACE SERIES BS B 28:1991 Incorporating Amendment Nos. 1 and 2 Specification for Copper-beryllium alloy strip, foil and parts (solution treated (W) and precipitated) Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:04:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS B 28:1991 This British Standard, having been prepared under the direction of the Aerospace Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 28 June 1991 © BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference ACE/16 Draft for comment 90/73956 DC ISBN 0 580 19427 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Aerospace Standards Policy Committee (ACE/-) to Technical Committee ACE/16, upon which the following bodies were represented: British Non-ferrous Metals Federation Copper Development Association Ministry of Defence Society of British Aerospace Companies Ltd. Amendments issued since publication Amd. No.DateComments 7115April 1992 8940December 1995 Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:04:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS B 28:1991 © BSI 02-2000i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2References1 3Technical requirements1 Table 1 Technical requirements for Cu-Be alloy strip, foil and parts (solution treated and precipitated)2 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:04:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS B 28:1991 ii © BSI 02-2000 Foreword This British Standard has been prepared under the direction of the Aerospace Standards Policy Committee. WARNING. This British Standard calls for the use of substances and/or procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitability and in no way absolves either the designer, the producer, the supplier or the user from statutory obligations relating to health and safety at any stage of manufacture or use. 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 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 amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:04:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS B 28:1991 © BSI 02-20001 1 Scope This British Standard specifies the chemical composition, mechanical properties and inspection and test requirements for a precipitation hardening copper-beryllium alloy supplied in the form of strip and foil. The material is supplied in the solution treated condition for precipitation treatment after conversion into parts. 2 References This standard makes reference to the following standards publications: BS B 100, Procedure for inspection, testing and acceptance of wrought copper alloys1). BS 2870, Specification for rolled copper and copper alloys: sheet, strip and foil. BS 5555, Specification for SI units and recommendations for the use of their multiples and of certain other units. BS 5775, Specification for quantities, units and symbols Part 0: General Principles. BS EN 2500, Instructions for the drafting and use of metallic material standards1). 3 Technical requirements 3.1 The technical requirements for material to this standard shall comply with those specified in Table 1. 3.2 Symbols and units in Table 1 shall be interpreted in accordance with BS 5555, BS 5775-0 or BS EN 2500. 3.3 For the purposes of this standard, a batch is defined as the material of the same nominal cross-sectional dimensions, from the same cast, manufactured by the same route and heat treated together. 1) In preparation. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:04:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS B 28:1991 2 © BSI 02-2000 Table 1 Technical requirements for Cu-Be alloy strip, foil and parts (solution treated and precipitated) 1Material designationCuBe1.9 2Chemical composition %ElementBeCo+ Ni Ni+ Co+ Fe AlSiOthersCu min.1.800.20Base max.2.000.60.20 0.20 0.50 3Method of melting 4Form Method of production Limit dimensions (mm) Strip and foil Rolling 0.10 k a k 3.0 55.1 Technical specificationSections 1 and 6 of BS B 100 5.2 Dimensional standardSection 6 of BS 2870:1980 66.1 Delivery condition and heat treatment Solution treated 760 °C k Ú k 835 °C/Quench 6.2 Delivery condition code 7Use condition and heat treatment Solution treated and precipitation treated Delivery condition + 315 °C k Ú k 330 °C/t = 3 h/AC Characteristics 8Sampling Test piece Heat treatment Delivery conditionUse condition 9Dimensions concernedmm 10Thickness of cladding on each face % 11Direction of sampleLTL 12 Tensile TemperatureÚ°CAmbient temperature 13Proof stressRp0.2MPa U 960 14StrengthRmMPa 410 k Rmk 540 1 140 k Rmk 1 340 15ElongationA%U 35U 3 16Reduction of area Z% 17Hardness90 k HV k 140350 kHV k 400 18Shear strengthRcMPa 19Bendingk0 (µ = 90°)0 (µ = 90°) 20Impact strength 21 Creep TemperatureÚ°C 22Timeh 23StressÖaMPa 24Elongationa% 25Rupture stressÖRMPa 26Elongation at rupture A% Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:04:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:04:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS B 28:1991 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 Standards 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 using 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: 020 8996 9000. Fax: 020 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: 020 8996 9001. Fax: 020 8996 7001. 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 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: 020 8996 7111. Fax: 020 8996 7048. 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: 020 8996 7002. Fax: 020 8996 7001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the 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 written 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. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel: 020 8996 7070. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:04:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI