1、BRITISH STANDARD AEROSPACE SERIESBS 2S 203:2004(Superseding BS S 203:1967)Carbon steel wire rod, wire and springs High duty unground wire Hardened and tempered SpecificationICS 49.025.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g5
2、5g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Incorporating um No. 1CorrigendCommittees responsible for this British StandardThe preparation of this British Standard was entrusted by ACE/61, Metallic materials for aerospace to Technical Committee ACE/61/-/15,
3、Steels, upon which the following bodies were represented:Cast Metals FederationCivil Aviation Authority AirworthinessConfederation of British MetalformingInstitute of Spring TechnologyMinistry of Defence UK Defence StandardizationSociety of British Aerospace Companies Ltd.UK Steel AssociationBS 2S 2
4、03:2004This British Standard waspublished under the authorityof the Standards Policy andStrategy Committee on14 December 2004 BSI 2011The following BSI referencesrelate to the work on this British Standard:Committee reference ACE/61/-/15Draft for comment 03/316691 DCAmendments/corrigenda issued sinc
5、e publicationAmd. No. Date Comments C1 31 March 2011 Normative references: “BS 5S 100” changed to “BS S 100” Throughout: “the latest edition of British Standard S 100” changed to “BS S 100”ISBN 978 0 580 72676 7BS 2S 203:2004 BSI 2011iContentsPageCommittees responsible Inside front coverForeword ii1
6、Scope 12 Inspection and testing procedure 13 Normative references 14 Process of manufacture 15 Chemical composition 16 Surface dressing 17 Condition 28 Freedom from defects 29 Final heat treatment 210 Mechanical properties 211 Examination for decarburization 312 Dimensional tolerances 3Table 1 Chemi
7、cal composition 1Table 2 Condition of supply 2Table 3 Tensile strengths 2BS 2S 203:2004ii BSI 2011ForewordThis British Standard has been prepared by Technical Committee ACE/61/-/15. It supersedes BS S 203:1967, which is withdrawn. The original standard was based on Ministry of Technology Specificati
8、on DTD 239B.This standard covers the specification of carbon steel wire rod, wire and springs, using high duty unground wire which has been hardened and tempered. In this revision units of measurement have been brought into line with SI.This publication does not purport to include all the necessary
9、provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 3 and a back cover.The BSI copyright n
10、otice displayed in this document indicates when the document was last issued.BS 2S 203:2004 BSI 201111 ScopeThis standard specifies carbon steel wire rod, wire and springs (high duty unground wire, hardened and tempered) for aerospace purposes.Wire conforming to this specification is suitable for sp
11、rings that are subject to exacting service conditions. It is not suitable for high duty dynamically stressed springs, for which wire conforming to BS 2S 204 ought be used, when hardened and tempered springs are required.2 Inspection and testing procedure2.1 GeneralThis British Standard shall be used
12、 in conjunction with BS S 100.2.2 Sulfur printing and deep etching testsSamples shall be selected in accordance with BS S 100.3 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For und
13、ated references, the latest edition of the referenced document (including any amendments) applies.BS S 100, Procedure for inspection, testing and acceptance of wrought steels (other than plate, sheet, strip and tube).BS EN 10270-2, Steel wire for mechanical springs Part 2: Oil hardened and tempered
14、spring steel wire.4 Process of manufactureThe material shall be manufactured by an open hearth, an oxygen or an electric process unless otherwise agreed between the manufacturer and the purchaser in accordance with BS S 100. 5 Chemical compositionThe steel shall contain the chemical levels shown in
15、Table 1.Table 1 Chemical composition6 Surface dressingThe material from which the rods are rolled shall be locally dressed in accordance with the requirements of BS S 100.Element PercentageMin. Max.Carbon 0.70 0.85Silicon 0.10 0.35Manganese 0.65 0.80Sulfur 0.030Phosphorus 0.030BS 2S 203:20042 BSI 20
16、117 ConditionThe material shall be supplied in the appropriate condition stated in Table 2 unless otherwise agreed between the manufacturer and the purchaser, in which case the condition in which the material is to be supplied shall be stated on the order.Table 2 Condition of supply8 Freedom from de
17、fects8.1 Surface defects Visual examinationThe rod and wire shall be visually examined in accordance with BS S 100.8.2 Surface defects Deep etching testsSamples of rod and wire, selected and prepared for examination in accordance with BS S 100, shall be immersed in a 50 % solution of concentrated hy
18、drochloric acid in water at a temperature of not less than85 C. The time of immersion shall be approximately two seconds for every 0.025 mm of diameter, butshall be not less than two minutes nor more than 10 minutes.9 Final heat treatmentThe final heat treatment of the springs, the tensile test piec
19、es for the rod, wire and springs and the reverse bend test pieces shall be:1) harden in oil from a temperature between 820 C and 850 C;2) temper at a temperature not less than 250 C to give the mechanical properties specified in Clause 10.10 Mechanical properties10.1 Tensile testsThe tensile propert
20、ies of test pieces representing rod, wire and springs, selected, prepared and tested in accordance with BS S 100 and heat treated in accordance with Clause 9 shall conform to the values givenin Table 3.Table 3 Tensile strengthsMaterial Condition of supplyRod for the manufacture of wire As rolledWire
21、 for the manufacture of springs Annealed or annealed and lightly drawnSprings Finally heat treatedNominal wire diameter Tensile strengthOver Up to and including Min. Max.mm mm MPa0.61 1.22 1 780 2 0901.22 1.63 1 700 1 9301.63 2.03 1 620 1 7702.03 3.25 1 540 1 7003.25 4.88 1 470 1 6204.88 7.62 1 390
22、1 5507.62 12.70 1 240 1 390BS 2S 203:2004 BSI 2011310.2 Reverse bend test (wire only 2.2 mm diameter or thickness and greater)The test pieces, selected in accordance with BS S 100, shall be heat treated in accordance with Clause 9and shall then be tested in accordance with BS S 100. For round wire,
23、each test piece shall be bent over suitable formers having radii not exceeding three times the nominal wire diameter and shall withstand,without cracking, three complete bends.10.3 Single bend test (wire only 2.2 mm diameter or thickness and greater)The test pieces, selected in accordance with BS S
24、100, shall be taken from the wire in the condition asdelivered and shall not be heat treated before being tested. They shall be tested in accordance with BS S 100over a radius equal to half the diameter or minor sectional dimension of the wire.10.4 Wrapping test (wire only less than 2.2 mm diameter
25、or thickness)The test pieces, selected in accordance with BS S 100, shall be taken from the wire in the condition as delivered and shall not be heat treated before being tested. They shall be tested in accordance with BS S 100.11 Examination for decarburization11.1 Microscopical examination of rod,
26、wire and springs shall be made in accordance with BS S 100.11.2 The section shall show no completely decarburized zone. The maximum amount of identifiable decarburization shall not exceed 1.5 % of the diameter or minor sectional dimension of the rod or wire.12 Dimensional tolerancesDimensional toler
27、ances of wire shall conform to BS EN 10270-2.BS 2S 203:2004BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI 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 inco
28、rporated by Royal Charter.RevisionsBritish 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
29、 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: +44 (0)20 8996 9000. Fax: +44 (0)20 8996 7400.BSI offers members an individual updating service
30、called PLUS which ensures that subscribers automatically receive the latest editions of standards.Buying standardsOrders 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-. Stan
31、dards are also available from the BSI website 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 standardsBSI provides a wide range of
32、 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: +44 (0)20 8996 7111
33、. Fax: +44 (0)20 8996 7048. Email: infobsi-.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 (
34、0)20 8996 7001. Email: membershipbsi-.Information regarding online access to British Standards via British Standards Online can be found at http:/www.bsi- information about BSI is available on the BSI website at http:/www.bsi-.CopyrightCopyright subsists in all BSI publications. BSI also holds the c
35、opyright, 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 oth
36、erwise 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.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-.
