1、BSI Standards Publication BS ISO 6932:2014 Cold-reduced carbon steel strip with a maximum carbon content of 0,25 %BS ISO 6932:2014 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 6932:2014. The UK participation in its preparation was entrusted to Technical Co
2、mmittee ISE/109, Coated and Uncoated Flat Products to be Used for Cold Forming. A list of organizations represented on this committee 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 co
3、rrect application. The British Standards Institution 2014. Published by BSI Standards Limited 2014 ISBN 978 0 580 82440 1 ICS 77.140.50 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy an
4、d Strategy Committee on 31 May 2014. Amendments/corrigenda issued since publication Date T e x t a f f e c t e dBS ISO 6932:2014 ISO 2014 Cold-reduced carbon steel strip with a maximum carbon content of 0,25 % Feuillards en acier au carbone lamins froid avec une teneur maximale en carbone gale 0,25
5、% INTERNATIONAL STANDARD ISO 6932 Fourth edition 2014-03-15 Reference number ISO 6932:2014(E)BS ISO 6932:2014ISO 6932:2014(E)ii ISO 2014 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2014 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilize
6、d otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright
7、office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in SwitzerlandBS ISO 6932:2014ISO 6932:2014(E) ISO 2014 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Normative references 1 3 T erms and definiti
8、ons . 1 4 Dimensions . 2 5 Chemical composition . 2 5.1 General . 2 5.2 Heat analysis . 2 5.3 Product analysis . 2 6 Conditions of manufacture 4 6.1 Physical properties 4 6.2 Steelmaking . 4 6.3 Weldability 7 6.4 Application . 7 6.5 Mechanical properties 7 6.6 Oiling 7 6.7 Edges 7 6.8 Surface finish
9、 8 7 Dimensional and shape tolerances . 8 8 Sampling Hardness or tensile test .11 9 Mechanical property tests .11 9.1 Hardness test .11 9.2 Tensile test .11 10 Retests 12 10.1 Machining and flaws12 10.2 Additional tests 12 11 Resubmission 12 12 Workmanship .12 13 Inspection and acceptance 12 14 Coil
10、 size 12 15 Marking .12 16 Information to be supplied by the purchaser13 Bibliography .14BS ISO 6932:2014ISO 6932:2014(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International
11、Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, al
12、so take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1.
13、 In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of the elem
14、ents of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations receive
15、d (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adhe
16、rence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information The committee responsible for this document is ISO/TC 17, Steel, Subcommittee SC 12, Continuous mill flat rolled products. This fourth edition cancels and replaces the thi
17、rd edition (ISO 6932:2008), which has been technically revised.iv ISO 2014 All rights reservedBS ISO 6932:2014INTERNATIONAL ST ANDARD ISO 6932:2014(E) Cold-reduced carbon steel strip with a maximum carbon content of 0,25 % 1 Scope This International Standard describes cold-reduced carbon steel strip
18、 with a maximum mass fraction of carbon of 0,25 %, furnished to two levels of closer tolerances than cold-reduced carbon steel sheet, with specific quality, specific hardness requirements or mechanical properties, specific edge, and specific finish. NOTE This International Standard does not apply to
19、 the product in narrow widths known as cold-reduced carbon steel sheet slit from wider widths (see ISO 3574), nor does it include cold-reduced carbon steel strip with a mass fraction of carbon over 0,25 % (see ISO 4960). Cold-reduced carbon steel strip is produced with a maximum mass fraction of the
20、 specified carbon not exceeding: 0,15 % for material specified to mechanical properties; 0,25 % for material specified to temper (hardness) requirements. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its app
21、lication. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test method ISO 6508-1, Metallic materials Rockwell hardness test Par
22、t 1: Test method ISO 6892-1, Metallic materials Tensile testing Part 1: Method of test at room temperature 3 T erms a nd definiti ons For the purposes of this document, the following terms and definitions apply. 3.1 cold-reduced carbon steel strip product manufactured from hot-rolled, descaled coils
23、 by cold reducing to the desired thickness on a single-stand mill or on a tandem mill consisting of several single stands in series 3.2 cold reduction process of reducing the thickness of the strip at room temperature whereby the amount of reduction is greater than that used for a skin pass (3.8) 3.
24、3 aluminium killed steel which has been deoxidized with aluminium sufficient to prevent the evolution of gas during solidification ISO 2014 All rights reserved 1BS ISO 6932:2014ISO 6932:2014(E) 3.4 annealing process of heating to, and holding at, a suitable temperature and then cooling at a suitable
25、 rate for such purposes as lowering hardness, facilitating cold working, producing a desired microstructure or obtaining desired mechanical, physical, or other properties 3.5 temper designation by number or term to indicate the hardness as a minimum, as a maximum, or as a range Note 1 to entry: The
26、tempers are obtained by the selection and control of chemical composition by amounts of cold reduction (3.2), by thermal treatment, and by a skin pass. 3.6 dead soft condition describing annealed strip produced without definite control of stretcher strains or fluting Note 1 to entry: It is suitable
27、for drawing and other applications where such surface characteristics are not objectionable. 3.7 s u r f a c e f i n i sh degree of smoothness or lustre of the strip 3.8 skin pass light cold rolling of the product resulting in an increase in hardness and some loss in ductility Note 1 to entry: The p
28、urpose of skin passing is to minimize the appearance of coil breaks, stretcher strains and fluting, or to control the shape, or to obtain the required surface finish (3.7). 3.9 lot sample portion consisting of 50 t or less of strip of the same designation rolled to the same thickness and temper (3.5
29、) or mechanical properties 4 Dimensions This product is commonly produced in thicknesses of 6 mm and under, and in widths of up to 600 mm, in coils and cut lengths. 5 Chemical composition 5.1 General The chemical composition (heat analysis) shall not exceed the values given in Tables 1 and 2. 5.2 He
30、at analysis An analysis of each heat of steel shall be made by the manufacturer to determine compliance with the requirements of Tables 1 and 2. When requested at the time of ordering, this analysis shall be reported to the purchaser or his representative. 5.3 Product analysis A product analysis can
31、 be made by the purchaser to verify the specified analysis of the product and shall take into consideration any normal heterogeneity. The product analysis tolerances shall be in accordance with Tables 2 and 3.2 ISO 2014 All rights reservedBS ISO 6932:2014ISO 6932:2014(E) Table 1 Chemical composition
32、 (heat analysis) Mass fractions in per cent Temper or quality designation Carbon (C) max. Manganese (Mn) max. Phosphorus (P) max. Sulfur (S) max. Temper No. 1, 2, 3 0,25 0,60 0,035 0,04 Temper No. 4, 5 0,15 0,60 0,035 0,04 CR21 0,15 0,60 0,05 0,035 CR22 0,10 0,50 0,04 0,035 CR23 0,08 0,45 0,03 0,03
33、CR24 0,06 0,45 0,03 0,03 Table 2 Limits on additional chemical elements a Mass fractions in per cent Element Heat analysis max. Product analysis max. Cu b 0,20 0,23 Ni b 0,20 0,23 Cr b c 0,15 0,19 Mo b c 0,06 0,07 Nb d 0,008 0,018 V d 0,008 0,018 Ti d 0,008 0,018 aEach of the elements listed in this
34、 table shall be included in the report of the heat analysis. When the amount of copper, nickel, chromium, or molybdenum present is less than 0,02 %, the analysis can be reported as “0,15 to 0,25 0,03 0,04 Manganese 0,60 0,03 Phosphorus 0,05 0,01 Sulfur 0,04 0,01 NOTE The above maximum tolerance is t
35、he allowable excess over the specified requirements not the heat analysis. ISO 2014 All rights reserved 3BS ISO 6932:2014ISO 6932:2014(E) 6 Conditions of manufacture 6.1 Physical properties 6.1.1 Either temper requirements in accordance with Table 4 or mechanical properties in accordance with Table
36、5 can be specified as given in this International Standard, but not both, since there is no direct correlation. 6.1.2 Cold-reduced carbon steel strip specified to temper requirements is produced to the following temper designations: No. 1 (hard); No. 2 (half hard); No. 3 (quarter hard); No. 4 (skin-
37、passed); No. 5 (dead soft). 6.1.3 Cold-reduced carbon steel strip specified to mechanical properties is produced to the following commercial and drawing quality designations: CR21 (commercial quality); CR22 (drawing quality); CR23 (deep drawing quality); CR24 (deep drawing quality aluminium killed).
38、 6.2 Steelmaking Unless otherwise agreed by the interested parties, the processes used in making the steel and in manufacturing cold-reduced carbon strip are left to the discretion of the manufacturer. On request, the purchaser shall be informed of the steelmaking process being used.4 ISO 2014 All r
39、ights reservedBS ISO 6932:2014ISO 6932:2014(E) Table 4 Temper and hardness requirements for cold-reduced carbon steel strip Temper Thickness e mm Hardness Rockwell B scale HRB Rockwell 30T scale HR30T Rockwell 15T scale HR15T Vickers HV No. 1 (hard) e 0,36 0,36 1,0 84 min. 73,1 min. 88,2 min. 170 mi
40、n. 170 min. 162 min. No. 2 (half hard) e 0,36 0,36 1,0 70 to 89 63,5 to 75,8 83,5 to 89,5 125 to 185 125 to 185 125 to 185 No. 3 (quarter hard) e 0,36 0,36 1,0 60 to 80 56,5 to 69,7 80 to 86,6 107 to 150 107 to 150 107 to 150 No. 4 a (skin-passed) e 0,36 0,36 1,0 65 max. 60 max. 82 max. 116 max. 116
41、 max. 116 max. No. 5 a (dead soft) e 0,36 0,36 1,0 55 max. 53 max. 78,5 max. 100 max. 100 max. 100 max. aCan be ordered with a carbon range of 0,15 % to 0,25 %. In each instance, the maximum hardness requirement is established by agreement. ISO 2014 All rights reserved 5BS ISO 6932:2014ISO 6932:2014
42、(E) Table 5 Mechanical property requirements for cold-reduced carbon steel strip a Quality designation Condition of delivery b R emax. cMPa R m dMPa A min. % L o= 80 mm e L o= 50 mm CR21 HK f TC HK270 HK290 HK390 HK490 HK590 HK690 410 max. 410 max. 290 to 430 390 to 540 490 to 640 590 to 740 690 min
43、. 28 28 18 32 32 24 CR22 TC HK270 HK290 HK390 HK490 HK590 250 355 370 max. 370 max. 290 to 410 390 to 510 490 to 620 590 min. 32 32 21 5 35 35 25 13 CR23 TC HK270 HK290 HK390 HK490 HK590 225 g 325 350 max. 350 max. 290 to 390 390 to 490 490 to 600 590 min. 36 36 23 6 38 38 27 14 CR24 TC HK270 HK290
44、HK390 HK490 HK590 225 g 325 350 max. 350 max. 290 to 390 390 to 490 490 to 590 590 to 690 36 36 23 6 38 38 27 14 aLongitudinal test pieces:R eyield strength;R mtensile strength;A percentage elongation after fracture;L ogauge length on test piece. bConditions of delivery: HK, cold-reduced; TC, anneal
45、ed; HK270, skin-passed; HK290 to HK690, cold-reduced, various amounts. cFor thicknesses of 0,7 mm and less, the specified maximum yield strength values are increased by 20 MPa. dMinimum tensile strength values for delivery conditions HK, TC and HK270 would normally be expected to be 270 MPa. eMinimu
46、m elongation values are reduced by 2 % for thicknesses of 0,5 mm to 0,7 mm inclusive and by 4 % for thicknesses of less than 0,5 mm. fThere are no mechanical property requirements for this condition. gFor thicknesses of 1,5 mm and greater, the maximum yield strength is 235 MPa.6 ISO 2014 All rights
47、reservedBS ISO 6932:2014ISO 6932:2014(E) 6.3 Weldability This product is suitable for welding if appropriate welding conditions are selected. As carbon content increases above 0,15 %, spot welding becomes increasingly difficult. 6.4 Application It is desirable that cold-reduced carbon steel strip be
48、 identified for fabrication by the name of the part or by intended application, which shall be compatible with the temper or mechanical properties specified. Proper identification of the part might include visual examination, prints or description, or a combination of these. 6.5 Mechanical propertie
49、s 6.5.1 Hardness When the temper designation is specified at the time the steel is made available for shipment, the hardness shall be as stated in Table 4 when it is determined on test pieces obtained in accordance with the requirements of Clause 7. 6.5.2 Tensile properties When the mechanical property designation is specified at the time the
