BS ISO 4997-2015 Cold-reduced carbon steel sheet of structural quality《冷轧碳素薄钢板的结构质量》.pdf

1、BSI Standards PublicationBS ISO 4997:2015Cold-reduced carbon steelsheet of structural qualityBS ISO 4997:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 4997:2015. Itsupersedes BS ISO 4997:2007 which is withdrawn.The UK participation in its preparation was

2、 entrusted to TechnicalCommittee ISE/109, Coated and Uncoated Flat Products to be Usedfor Cold Forming.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are re

3、sponsible for its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 83924 5ICS 77.140.50Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandar

4、ds Policy and Strategy Committee on 31 January 2015.Amendments issued since publicationDate T e x t a f f e c t e dBS ISO 4997:2015 ISO 2015Cold-reduced carbon steel sheet of structural qualityTles en acier au carbone lamines froid, de qualit destine la constructionINTERNATIONAL STANDARDISO4997Fifth

5、 edition2015-02-01Reference numberISO 4997:2015(E)BS ISO 4997:2015ISO 4997:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, elec

6、tronic 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 officeCase postale 56 CH-1211 Geneva 20Tel. +

7、41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 4997:2015ISO 4997:2015(E)Contents PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Dimensions . 25 Conditions of manufacture 25.1 Steelmaking . 25.2 Chemical composi

8、tion 25.3 Chemical analysis 35.3.1 Heat analysis 35.3.2 Product analysis . 35.4 Weldability 35.5 Application . 45.6 Mechanical properties 45.7 Surface quality . 45.7.1 General 45.7.2 Surface quality A (unexposed) . 45.7.3 Surface quality B (exposed) . 45.8 Surface finish 55.9 Suitability for surface

9、 coating 55.10 Oiling 56 Dimensional and shape tolerances . 57 Tensile-test sampling . 58 Tensile test 59 Retests . 59.1 Machining and flaws. 59.2 Elongation . 59.3 Additional tests . 610 Resubmission . 611 Workmanship 612 Inspection and acceptance . 613 Coil size . 614 Marking 615 Information to be

10、 provided by the purchaser 7Bibliography 8 ISO 2015 All rights reserved iiiBS ISO 4997:2015ISO 4997:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is nor

11、mally 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, also take part in

12、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. In particular th

13、e 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. www.iso.org/directives.Attention is drawn to the possibility that some of the elements of this document m

14、ay 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 received. www.iso.org/patents.

15、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 adherence to the WTO principles in

16、 the Technical Barriers to Trade (TBT), see the following URL: Foreword Supplementary information .The committee responsible for this document is ISO/TC 17, TC Steel, Subcommittee SC 12, Continuous mill flat rolled products.This fifth edition cancels and replaces the fourth edition (ISO 4997:2007),

17、which has been technically revised.iv ISO 2015 All rights reservedBS ISO 4997:2015Cold-reduced carbon steel sheet of structural quality1 ScopeThis International Standard applies to cold-reduced carbon steel sheet of structural quality in grades CR220, CR250, CR320, and CH550, usually without the use

18、 of microalloying elements. The product is intended for structures that include bolting, riveting, and welding. It is generally used in the delivered condition for fabricating purposes, such as bending, forming, and welding.This International Standard does not cover steels designated as commercial q

19、uality or drawing qualities (covered in ISO 3574), cold-reduced carbon steel sheet according to hardness requirements (covered in ISO 5954), cold-reduced steel sheet of higher strength with improved formability (covered in ISO 13887), or cold-reduced steel sheet of high tensile strength and low yiel

20、d point with improved formability (covered in ISO 14590).2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable to its application. For dated references, only the edition cited applies. For undated references, the latest

21、edition of the reference documents (including any amendments) applies.ISO 6892-1, Metallic materials Tensile testing Part 1: Method of test at room temperatureISO 16162, Cold-rolled steel sheet products Dimensional and shape tolerances3 Terms and definitionsFor the purposes of this document, the fol

22、lowing terms and definitions apply.3.1microalloying elementniobium, vanadium, titanium, etc. added singly or in combination to obtain higher strength levels combined with better formability, weldability, and toughness compared to non-alloyed steels produced to equivalent strength levels3.2cold-reduc

23、ed steel sheetproduct obtained from hot-rolled descaled steel sheet by cold reducing to the required sheet thickness followed by annealing to recrystallize the grain structureNote 1 to entry: The annealed product is normally supplied skin-passed (see 3.3) but may be supplied annealed-last (i.e. with

24、out a skin pass), if specified by the purchaser on his order.Note 2 to entry: CH 550 is a product which has not been annealed after reduction to the specified thickness.3.3skin passlight cold rolling of the productNote 1 to entry: The purpose of the skin passing is one or more of the following:a) to

25、 minimize the appearance of coil breaks, stretcher strains, and fluting;b) to control the shape;c) to obtain the required surface finish.INTERNATIONAL STANDARD ISO 4997:2015(E) ISO 2015 All rights reserved 1BS ISO 4997:2015ISO 4997:2015(E)Note 2 to entry: Some increase in hardness and some loss in d

26、uctility will result from skin passing.3.4lot50 t or less of sheet of the same grade rolled to the same thickness and condition4 Dimensions4.1 The product is commonly produced in thicknesses from 0,36 mm up to 3 mm and in widths of 600 mm and over, in coils and cut lengths.4.2 Cold-reduced sheet les

27、s than 600 mm wide can be slit from wide sheet and will be considered as sheet.5 Conditions of manufacture5.1 SteelmakingUnless otherwise agreed by the interested parties, the processes used in making the steel and in manufacturing cold-reduced sheet are left to the discretion of the manufacturer. O

28、n request, the purchaser shall be informed of the steelmaking process being used.5.2 Chemical compositionThe chemical composition (heat analysis) shall not exceed the values given in Table 1 and Table 2.Table 1 Chemical composition (heat analysis)Mass fractions in per centGradeC max.Mn max.P max.S m

29、ax.CR 220 0,15 1,20 0,035 0,035CR 250 0,25 1,40 0,035 0,035CR 320 0,25 1,50 0,035 0,035CH 550 0,25 1,50 0,035 0,035Table 2 Limits on additional chemical elementsMass fractions in per centElementHeat analysis max.Product analysis max.Cua0,20 0,23Nia0,20 0,23Cra, b0,15 0,19Moa, b0,06 0,07Nbc0,008 0,01

30、8aThe sum of copper, nickel, chromium, and molybdenum shall not exceed 0,50 % on heat analysis. When one or more of these elements are specified, the sum does not apply; in which case, only the individual limits on the remaining elements will apply.bThe sum of chromium and molybdenum shall not excee

31、d 0,16 % on heat analysis. When one or more of these elements are specified, the sum does not apply; in which case, only the individual limits on the remaining elements will apply.cHeat analysis greater than 0,008 % can be supplied after agreement between the producer and consumer.2 ISO 2015 All rig

32、hts reservedBS ISO 4997:2015ISO 4997:2015(E)ElementHeat analysis max.Product analysis max.Vc0,008 0,018Tic0,008 0,018aThe sum of copper, nickel, chromium, and molybdenum shall not exceed 0,50 % on heat analysis. When one or more of these elements are specified, the sum does not apply; in which case,

33、 only the individual limits on the remaining elements will apply.bThe sum of chromium and molybdenum shall not exceed 0,16 % on heat analysis. When one or more of these elements are specified, the sum does not apply; in which case, only the individual limits on the remaining elements will apply.cHea

34、t analysis greater than 0,008 % can be supplied after agreement between the producer and consumer.5.3 Chemical analysis5.3.1 Heat analysisAn analysis of each heat of steel shall be made by the manufacturer in order to determine compliance with the requirements given in Table 1 and Table 2. On reques

35、t, at the time of ordering, this analysis shall be reported to the purchaser or his representative. Each of the elements listed in Table 2 shall be included in the report of the heat analysis.5.3.2 Product analysisA product analysis can be made by the purchaser to verify the specified analysis of th

36、e product and shall take into consideration any normal heterogeneity. The sampling method shall be agreed between the manufacturer and purchaser at the time of ordering. The product analysis tolerances shall be in accordance with Table 2 and Table 3.Table 3 Product analysis toleranceMass fractions i

37、n per centElement Maximum of specified element Tolerance over maximum specifiedC0,150,15 to 0,400,030,04Mn0,600,60 to 1,150,15 to 1,650,030,040,05P 0,04 0,01S 0,04 0,01NOTE The above maximum tolerance is the allowable excess over the specified requirements and not the heat analysis.5.4 WeldabilityTh

38、is product is normally suitable for welding if appropriate welding conditions are selected. When the mass fraction of carbon exceeds 0,15 %, spot welding becomes increasingly difficult. Because the heat of welding might have a significant effect on lowering the strength of grade CH550, this grade is

39、 not recommended for welding.Table 2 (continued) ISO 2015 All rights reserved 3BS ISO 4997:2015ISO 4997:2015(E)5.5 ApplicationIt is desirable that cold-reduced steel sheet be identified for fabrication by the name of the part or by the intended application, which shall be compatible with the grade s

40、pecified. Proper identification of the part can include visual examination, prints or description, or a combination of these.5.6 Mechanical propertiesExcept when ordered according to an identified specification, the mechanical properties shall be as given in Table 4, when they are determined on test

41、 pieces obtained in accordance with the requirements of Clause 7.Table 4 Mechanical propertiesGradeReamin. N/mm2Rmmin. N/mm2Abmin. %L0= 50 mm L0= 80 mmCR220 220 300 22 20CR250 250 330 20 18CR320 320 400 16 14CH550 550cNot applicable Not applicableRe= yield strength-can be either ReLor ReH, but not b

42、othReL= lower yield strengthReH= upper yield strengthRm= tensile strengthA = percentage elongation after fractureL0= original gauge length of original test piece1 N/mm2= 1MPaaThe yield strength can be measured by 0,5 % elongation proof strength (proof strength under load) or by 0,2 % offset when a d

43、efinite yield phenomenon is not present .bUse either L0= 50 mm or L0= 80 mm.cFor grade CH550, the yield strength approaches the tensile strength and, since there is no hesitation in the pointer or drop of the beam, the ReLshall be taken as the strength at 0,5 % total elongation under load in accorda

44、nce with ISO 6892-1.5.7 Surface quality5.7.1 GeneralThe products are supplied according to either surface quality A or B.5.7.2 Surface quality A (unexposed)Imperfections, such as pores, slight imperfections, small marks, minor scratches, and slight colouring, which do not affect the formability or t

45、he application of surface coatings, are permitted.5.7.3 Surface quality B (exposed)5.7.3.1 The better of the two surfaces shall be free of imperfections, which might affect the uniform appearance of quality paint or an electrolytic coating (see 5.9). The other surface shall at least conform to surfa

46、ce quality A.5.7.3.2 In the case of delivery of coil and slit coil, the percentage of defects can be greater than in the case of delivery in sheet or cut lengths. The purchaser should take this into account, and the percentage 4 ISO 2015 All rights reservedBS ISO 4997:2015ISO 4997:2015(E)of admissib

47、le surface defects can be agreed at the time of the enquiry and order. Unless otherwise agreed, a single surface of the product shall comply with the specified requirements. The other surface shall be such that, during subsequent treatment, it does not have a deleterious effect on the better surface

48、.5.8 Surface finish5.8.1 Cold-reduced steel sheet is normally produced with a matte finish, dull in appearance, which is suitable for ordinary decorative painting but is not recommended for electroplating.5.8.2 When cold-reduced steel sheet is deformed during fabrication, localized areas can roughen

49、 to some degree, and such affected portions of the part might require hand-finishing to prepare the surface for the intended application.5.8.3 By agreement at the time of the enquiry and order, ranges for surface roughness can be specified for specific end uses.5.9 Suitability for surface coatingThe products can be required for metallic coating by the hot dip coating or electrolytic coating process, or organic coating or other coating. When such a coating is intended, it shall be specified at the time of ordering.5.10 OilingAs