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1、BRITISH STANDARD BS EN 10268:2006 Cold rolled steel flat products with high yield strength for cold forming Technical delivery conditions The European Standard EN 10268:2006 has the status of a British Standard ICS 77.140.50 ? BS EN 10268:2006 This British Standard was published under the authority
2、of the Standards Policy and Strategy Committee on 29 September 2006 BSI 2006 ISBN 0 580 48667 2 National foreword This British Standard was published by BSI. It is the UK implementation of EN 10268:2006. It supersedes BS EN 10268:1999 which is withdrawn. The UK participation in its preparation was e
3、ntrusted to Technical Committee ISE/10, Flat rolled steels products. A list of organizations represented on ISE/10 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 correct application.
4、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 10268 July 2006 ICS 77.140.50Supersedes EN 10268:1998 English Version Cold rolled steel flat products with
5、high yield strength for cold forming - Technical delivery conditions Produits plats lamins froid haute limite dlasticit pour formage froid - Conditions techniques de livraison Kaltgewalzte Flacherzeugnisse aus Sthlen mit hoher Streckgrenze zum Kaltumformen - Technische Lieferbedingungen This Europea
6、n Standard was approved by CEN on 12 June 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 bibliographical references concern
7、ing 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 CEN member into its own la
8、nguage 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, Latvia, Lithuania, Luxembourg,
9、 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 Brussels 2006 CENAll rights of
10、 exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 10268:2006: E EN 10268:2006 (E) 2 Contents Foreword3 1 Scope 4 2 Normative references4 3 Terms and definitions .5 4 Designation 5 5 Requirements.6 5.1 Steelmaking and manufacturing processes 6 5.2 Che
11、mical composition 6 5.3 Delivery conditions6 5.4 Mechanical properties.7 5.5 Surface characteristics .9 5.5.1 General9 5.5.2 Surface quality.9 5.5.3 Surface finish.9 5.6 Suitability for surface coating9 5.7 Weldability10 5.8 Tolerances on dimensions and shape 10 6 Tests10 6.1 General10 6.2 Inspectio
12、n units .10 6.2.1 Products of rolled width 600 mm10 6.2.2 Products of rolled width 1,2 mm special agreements must be made. c When the thickness is less than or equal to 0,7 mm and greater than 0,5 mm, the minimum value for elongation is reduced by 2 units. d The minimum values for r (trans.) and n (
13、trans.) only apply to products of thickness equal to or greater than 0,5 mm. e For products with thickness over 2 mm the minimum r (trans.) value is reduced by 0,2. EN 10268:2006 (E) 9 For the LA grades it may be agreed that the requirements given in Table 3 for longitudinal test pieces shall apply
14、instead of those for transverse test pieces. Table 3 Mechanical properties of longitudinal test pieces Steel name Steel number 0,2% proof strength a Rp0,2 long. MPa Tensile strength Rm long. MPa Elongation b A80 min. long. % HC260LA 1.0480 240-310 340-420 27 HC300LA 1.0489 280-360 370-470 24 HC340LA
15、 1.0548 320-410 400-500 22 HC380LA 1.0550 360-460 430-550 20 HC420LA 1.0556 400-500 460-580 18 NOTE 1 MPa = 1 N/mm2. a If the yield strength is pronounced, the values apply to the lower yield point (ReL). b When the thickness is less than or equal to 0,7 mm and greater than 0,5 mm, the minimum value
16、 for elongation is reduced by 2 units. 5.5 Surface characteristics 5.5.1 General The surface properties cover surface quality and surface finish. 5.5.2 Surface quality 5.5.2.1 Products of rolled width 600 mm The products are supplied with one of the surface qualities A or B as defined in EN 10130 ex
17、cept for LA grades for which only surface quality A applies. 5.5.2.2 Products of rolled width 600 mm The requirements of EN 10139 apply. 5.5.3 Surface finish 5.5.3.1 Products of rolled width 600 mm The requirements of EN 10130 apply. 5.5.3.2 Products of rolled width 600 mm The requirements of EN 101
18、39 apply. 5.6 Suitability for surface coating The products may be intended for metallic coating applied by hot dipping or electrodeposition and/or organic or other coatings. When such a coating is required, this shall be specified at the time of enquiry and order. EN 10268:2006 (E) 10 5.7 Weldabilit
19、y The products are suitable for standard welding processes. However, the welding process should be specified at the time of enquiry and order, especially in the case of gas welding. 5.8 Tolerances on dimensions and shape The tolerances on dimensions and shape of products in rolled widths 600 mm are
20、those given in EN 10131; those of products in rolled widths 600 mm are given in EN 10140. 6 Tests 6.1 General The purchaser shall specify at the time of enquiry and order his or her requirements for: type of inspection and testing, specific or non specific: see EN 10021; type of inspection document:
21、 see EN 10204. Specific inspection and testing shall be carried out in accordance with 6.2 to 6.7. Specific inspection and testing may not be specified either for the product analysis or for the surface finish. 6.2 Inspection units 6.2.1 Products of rolled width 600 mm The inspection unit is 30 t or
22、 fraction of 30 t for products of the same quality and nominal thickness. When a coil exceeds 30 t, it constitutes a single inspection unit, as does its products. 6.2.2 Products of rolled width 600 mm The inspection unit is 5 t or a fraction of 5 t of product of the same steel grade, same heat treat
23、ment with the same surface properties and same nominal thickness. Coils of mass exceeding 5 t shall be considered as comprising a single inspection unit. 6.3 Number of tests For each inspection unit, a tensile test and where appropriate, a determination of the plastic strain ratio r and the tensile
24、strain hardening exponent n (see Table 2) in the as-delivered state shall be carried out. In the case of bake hardening steels, further tensile tests shall be carried out (see 6.5.3). 6.4 Sampling The requirements of EN ISO 377 and EN 10021 are supplemented by the following specific requirements: fo
25、r sheet and cut lengths the selection of products to be tested and the position of the samples in the products is left to the discretion of the inspection representative; in the case of wide strip and slit wide strip, the sample should preferably be taken from the outer end. If the width of the prod
26、uct permits, the test pieces for the tensile test shall be taken transverse to the direction of rolling. For LA grades, longitudinal tensile test pieces may be agreed on. EN 10268:2006 (E) 11 6.5 Test methods 6.5.1 The tensile test shall be carried out according EN 10002-1 using type 2 test pieces (
27、initial gauge length Lo = 80 mm, width b = 20 mm). 6.5.2 The determination of the plastic strain ratio r and the strain hardening exponent n shall be carried out in accordance with ISO 10113 and ISO 10275. The strain ratio r and the strain hardening exponent n are determined within the strain range
28、10% to 20%. As the determination shall be carried out in the range of homogeneous deformation, then if the uniform elongation of the tested material is lower than 20%, values for the upper limit of the strain range of 15% to 20% can be applied. 6.5.3 The determination of the yield strength increase
29、by the effect of heat treatment (Bake-Hardening-Index) shall be carried our in accordance with prEN 10325. 6.6 Chemical analysis For the determination of the chemical composition, EN ISO 14284 and the corresponding European Standards shall apply. 6.7 Retests The requirement of EN 10021 shall apply.
30、6.8 Inspection document By agreement at the time of enquiry and order an inspection document chosen from those given in European Standard EN 10204 shall be supplied. 7 Marking 7.1 Products of rolled width 600 mm Unless otherwise agreed at the time of enquiry and order, marking shall be carried out o
31、n the inspected surface by means of easy removable non-corrosive ink. Slit wide strip products are not marked unless otherwise agreed at the time of enquiry and order. 7.2 Products of rolled width 600 mm Marking of the products in line with the specifications of EN 10021 may be agreed at the time of
32、 enquiry and order. 8 Packing The packing requirements shall be agreed at the time of enquiry and order. 9 Disputes With regard to any claims and any action arising, EN 10021 shall apply. EN 10268:2006 (E) 12 10 Information to be supplied by the purchaser at the time of enquiry and order In order to
33、 allow the manufacturer to supply products conforming to this European Standard, the following information shall be provided by the purchaser at the time of enquiry and order: a) full designation as given in clause 4; b) nominal dimensions, the tolerances according to the dimensional standard and th
34、e ordered quantities; c) limits on the mass and the sizes of the coils and the individual bundles; d) intended application of the products, including surface coatings; e) if the products are to be welded, the indication of the method to be used; f) if the products are to be supplied as suitable for
35、making a specific part; g) if inspection documents are required and their type; h) if an external inspection is to be carried out at the manufacturers works; i) if oiling is not required; j) if other protective coatings are required; k) detailed description of all other special requirements; l) any
36、special requirements for packing and marking (e. g. bar coding, see EN 606); m) position of the surface of better surface quality. EN 10268:2006 (E) 13 Bibliography EN 606, Bar coding Transport and handling labels for steel products BS EN 10268:2006 BSI 389 Chiswick High Road London W4 4AL BSI Briti
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