《BS-EN-10325-2006.pdf》由会员分享，可在线阅读，更多相关《BS-EN-10325-2006.pdf（10页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS EN 10325:2006 Steel Determination of yield strength increase by the effect of heat treatment Bake-Hardening-Index The European Standard EN 10325:2006 has the status of a British Standard ICS 77.040.10; 71.080.20 ? BS EN 10325:2006 This British Standard was published under the aut
2、hority of the Standards Policy and Strategy Committee on 29 September 2006 BSI 2006 ISBN 0 580 48971 X National foreword This British Standard was published by BSI. It is the UK implementation of EN 10325:2006. The UK participation in its preparation was entrusted by Technical Committee ISE/NFE/4, M
3、echanical testing of metals, to Subcommittee ISE/NFE/4/1, Uniaxial testing of metals. A list of organizations represented on ISE/NFE/4/1 can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its
4、 correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 10325 August 2006 ICS 77.040.10; 71.080.20 English Version Steel - Determination of y
5、ield strength increase by the effect of heat treatment Bake-Hardening-Index Aciers - Dtermination de laugmentation de la limite apparente dlasticit due un traitement thermique (index de durcissement la cuisson Bake-hardening) Stahl - Bestimmung der Streckgrenzenerhhung durch Wrmebehandlung (Bake-Har
6、dening-Index) This European Standard was approved by CEN on 7 July 2006. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliogra
7、phical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a C
8、EN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvi
9、a, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Bruss
10、els 2006 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 10325:2006: E EN 10325:2006 (E) 2 Contents Foreword3 1 Scope 4 2 Normative references4 3 Terms and definitions .4 4 Symbols and designations.6 5 Principle6 6 Test equipment 6
11、7 Test pieces .6 8 Testing procedure6 8.1 Testing conditions.6 8.2 Heat treatment conditions 6 8.3 Determination of Bake-Hardening-Index (BH2) .7 9 Test report7 EN 10325:2006 (E) 3 Foreword This document (EN 10325:2006) has been prepared by Technical Committee ECISS/TC 1 “Steel - Mechanical testing”
12、, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2007, and conflicting national standards shall be withdrawn at the latest by February 2007. Ac
13、cording to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lith
14、uania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 10325:2006 (E) 4 1 Scope This document specifies the method for the determination of yield strength increase by the effect of heat treatment (Bake-Hardening
15、-Index) for steel. NOTE This test is applied in particular, to steels showing a mechanism of bake hardening, which are specially intended for automotive industry. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, o
16、nly the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 10002-1:2001, Metallic materials Tensile testing Part 1: Method of test at ambient temperature 3 Terms and definitions For the purposes of this document, the te
17、rms and definitions given in EN 10002-1:2001 and the following apply. NOTE However it should be noted that in the context of this document, the term “yield strength“ also covers 0,2 % proof strength in addition to its definition in EN 10002-1. 3.1 Bake-Hardening-Index (BH2) increase of yield strengt
18、h between a reference condition after a 2 % plastic pre-strain and the condition obtained after a heat treatment simulating the usual industrial paint processes (see Figure 1) NOTE The heat treatment of simulation is specified in 8.2. EN 10325:2006 (E) 5 Key 1 Stress 2 Strain 3 Application of a 2 %
19、plastic pre-strain 4 Tensile test after heat treatment on the same test piece Figure 1 Illustration of the determination of BH2 EN 10325:2006 (E) 6 4 Symbols and designations The symbols used in this document and the corresponding designations are given in Table 1. Table 1 Symbols and designations S
20、ymbol Unit Designation Rp2,r MPa a Stress corresponding to a 2 % plastic prestrain measured on the test piece ReL,t MPa Lower yield strength measured on the test piece initially prestrained at 2 % and then heat treated Rp0,2,t MPa 0,2 % proof strength measured on the test piece initially prestrained
21、 at 2 % and then heat treated BH2 MPa Bake-Hardening-Index a 1 MPa = 1 N/mm. 5 Principle The test determines an index giving the increase of yield strength of a test piece submitted to a 2 % plastic pre- strain, then to a specified heat treatment. 6 Test equipment The test equipment shall be in acco
22、rdance with EN 10002-1. 7 Test pieces The test pieces shall be according to EN 10002-1. 8 Testing procedure 8.1 Testing conditions The tensile test shall be performed according to Annex A of EN 10002-1:2001. The testing rate given in EN 10002-1 for the beginning of the tensile test, shall only be in
23、creased after the determination of ReL or Rp0,2. During the pre-straining of the test pieces, the testing rate shall be kept constant up to a plastic pre-strain of (2 0,05) %. All tensile tests used to characterize a steel shall be performed with the same actual testing rate. 8.2 Heat treatment cond
24、itions A test piece temperature of 170 C shall be achieved within 7 min. The heat treatment time of (20 0,5) min commences when a test piece temperature of 168 C is achieved. The heat treatment equipment used shall be capable of keeping the prescribed test piece temperature (i.e. 170 C) at 2 C. The
25、temperature measuring device shall have a resolution of no more than 1 C with a maximum measuring uncertainty of 2 C. After the holding time, the test piece shall be air cooled to room temperature, i.e. (23 5) C. EN 10325:2006 (E) 7 8.3 Determination of Bake-Hardening-Index (BH2) The BH2-Index is th
26、e difference between the proof strength, Rp2,r, of the 2 % plastically strained test piece (modulus of elasticity of steel considered to be 200 000 MPa) and the lower yield strength, ReL,t, or the proof strength, Rp0,2,t, of the same test piece after an additional heat treatment at 170 C with a hold
27、ing time of 20 minutes. Determining ReL,t or Rp0,2,t after heat treatment, the cross-sectional area of the test piece after a plastic pre-strain shall be used. rp2,p0,2tteL,2 orRRRBH=)( (1) 9 Test report 9.1 If testing of BH2 is carried out in combination with the conventional test according to EN 1
28、0002-1, the Bake- Hardening-Index shall be added to the test report. 9.2 If testing of BH2 is carried out separately, the test report shall contain at least the following information: a) reference to this European Standard; b) identification of the test piece; c) location and direction of sampling;
29、d) test result. BS EN 10325:2006 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 Cha
30、rter. 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 inaccu
31、racy 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 called PLUS which
32、 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: +44 (0)20 8996 9001. Fax: +44 (0)20 8996 7001. Email: ordersbsi-. Standards are also
33、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 standards BSI provides a wide range of information
34、 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. Fax: +44 (
35、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 (0)20 8996 7
36、001. Email: membershipbsi-. 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 c
37、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
38、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-.