1、 ISO 2012 Cold-reduced carbon steel sheet of commercial and drawing qualities Tles en acier au carbone lamines froid de qualit commerciale et pour emboutissage INTERNATIONAL STANDARD ISO 3574 Fifth edition 2012-12-15 Reference number ISO 3574:2012(E) ISO 3574:2012(E)ii ISO 2012 All rights reserved C
2、OPYRIGHT PROTECTED DOCUMENT ISO 2012 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address be
3、low or ISOs member body in the country of the requester. ISO copyright 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 Switzerland ISO 3574:2012(E) ISO 2012 All rights reserved iii Contents Page Foreword iv 1
4、Scope . 1 2 Normative references 1 3 T erms and definitions . 1 4 Dimensions . 2 5 Conditions of manufacture 2 5.1 Chemical composition 2 5.2 Skin passing . 3 5.3 Oiling 3 5.4 Weldability 3 5.5 Fabrication qualities. 3 5.6 Strain ageing . 4 5.7 Surface condition 4 5.8 Surface finish 5 5.9 Applicatio
5、n . 5 5.10 Mechanical properties 5 6 Dimensional and shape tolerances . 6 7 Tensile test sampling . 7 8 Tensile test 7 9 Retests . 7 9.1 Machining and flaws. 7 9.2 Elongation . 7 9.3 Additional tests . 7 10 Resubmission . 7 11 Workmanship 7 11.1 Commercial quality CR1 . 7 11.2 Drawing quality CR2, C
6、R3, CR4, CR5 8 12 Inspection and acceptance . 8 13 Coil size . 8 14 Marking 8 15 Information to be supplied by the purchaser. 8 Bibliography .10 ISO 3574:2012(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodie
7、s). The work of preparing International 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 n
8、on-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Pa
9、rt 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies castin
10、g a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 3574 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 12, Continuo
11、us mill flat rolled products. This fifth edition cancels and replaces the fourth edition ( ISO 3574:2008), which has been technically revised.iv ISO 2012 All rights reserved INTERNATIONAL ST ANDARD ISO 3574:2012(E) Cold-reduced carbon steel sheet of commercial and drawing qualities 1 Scope This Inte
12、rnational Standard applies to cold-reduced carbon steel sheet of commercial and drawing qualities. It is suitable for applications where the surface is of prime importance. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indisp
13、ensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the reference document (including any amendments) applies. ISO 6892-1, Metallic materials Tensile testing Part 1: Method of test at room temperature ISO 10113, Metallic ma
14、terials Sheet and strip Determination of plastic strain ratio ISO 10275, Metallic materials Sheet and strip Determination of tensile strain hardening exponent ISO 16162, Cold-rolled steel sheet products Dimensional and shape tolerances 3 T erms an d definiti ons For the purposes of this document, th
15、e following terms and definitions apply. 3.1 cold-reduced steel sheet product obtained from hot-rolled descaled steel sheet by cold reducing to the required sheet thickness followed by annealing to recrystallize the grain structure 3.2 skin pass light cold-rolling of hot-rolled steel sheet or hot-ro
16、lled descaled steel Note 1 to entry: The purpose of the skin pass is to produce a higher degree of surface smoothness and thereby improve the surface appearance. The skin pass also temporarily minimizes the occurrence of a surface condition known as stretcher strain (Luders Lines) or fluting during
17、the fabrication of finished parts. The skin pass also controls and improves flatness. Some increase in hardness and loss of ductility will result from skin passing. 3.3 camber greatest deviation of a side edge from a straight line, the measurement being taken on the concave side with a straightedge
18、3.4 out-of-square greatest deviation of an end edge from a straight line at right angles to a side and touching one corner, the measurement being taken as described in ISO 16162, or measurable as one-half the difference between the diagonals of the cut-length sheet 3.5 stabilized interstitial free s
19、teel e x t r a - l o w - c a r b o n s t e e l i n w h i c h a l l i n t e r s t i t i a l e l e m e n t s a r e c o m b i n e d w i t h t i t a n i u m and/or equivalent elements ISO 2012 All rights reserved 1 ISO 3574:2012(E) 4 Dimensions 4.1 Cold-reduced carbon steel sheet is produced in thicknes
20、ses of 0,36 mm and thicker (commonly produced up to 4 mm) and in widths of 600 mm and over, in coils and cut lengths. 4.2 Cold-reduced sheet less than 600 mm wide can be slit from wide sheet and will be considered as sheet. 5 Conditions of manufacture 5.1 Chemical composition The chemical compositio
21、n (heat analysis) shall not exceed the values given in Tables 1 and 2. On request, a report of the heat analysis shall be made to the purchaser. Each of the elements listed in Table 2 shall be included in the report of the heat analysis. When the amount of copper, nickel, chromium or molybdenum pres
22、ent is less that 0,02 %, the analysis result may be reported as “ 0,02 %”. A verification analysis may be made by the purchaser to verify the specified analysis of the product and shall take into consideration any normal heterogeneity. Non-killed steels (such as rimmed or capped steels) are not tech
23、nologically suited to product analysis. For killed steels, the sampling method and deviation limits shall be agreed upon between the interested parties at the time of ordering. The product analysis tolerances are shown in Table 3. The processes used in making the steel and in manufacturing zinc-coat
24、ed sheet are left to the discretion of the manufacturer. When requested, the purchaser shall be informed of the steel-making process used. Table 1 Chemical composition (heat analysis) Mass fractions in percent Quality Carbon max. Manganese max. Phosphorus max. Sulfur max. Titanium amax. Designation
25、Name CR1 Commercial 0,15 0,60 0,050 0,035 CR2 Drawing b 0,10 0,50 0,040 0,035 CR3 Deep drawing b 0,08 0,45 0,030 0,03 CR4 Deep drawing aluminum killedb (non-ageing) 0,06 0,45 0,030 0,03 CR5 Extra deep drawing c(stabilized interstitial free) 0,02 0,25 0,020 0,02 0,15 aTitanium may be replaced totally
26、 or partially by niobium or vanadium. Carbon and nitrogen shall be completely stabilized. bIf interstitial free (IF steel) is to be applied to CR2, CR3 and CR4 orders, the values of 0,15 % maximum Ti, and 0,10 % maximum Nb and V, are acceptable to ensure that the carbon and nitrogen are fully stabil
27、ized. cBy agreement, the manganese, phosphorus and sulfur maximums may be adjusted.2 ISO 2012 All rights reserved ISO 3574:2012(E) Table 2 Limits on additional chemical elements Mass fractions in percent Elements Heat analysis max. Product analysis max. Cu a 0,20 0,23 Ni a 0,20 0,23 Cr a, b 0,15 0,1
28、9 Mo a, b 0,06 0,07 Nb c 0,008 0,018 V c 0,008 0,018 Ti c 0,008 0,018 aThe 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 ele
29、ments 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. cFor stabilized steels, the maximum for titanium i
30、s 0,15 %, and the maximum for each of niobium and vanadium is 0,10 %, to ensure that the carbon and nitrogen are fully stabilized. Table 3 Product analysis tolerances Mass fractions in percent Element M a x i mu m of s p e c i f ie d e l e me n t Tolerance over maximum speci- f ie d Carbon 0,15 0,03
31、 Manganese 0,60 0,03 Phosphorus 0,05 0,01 Sulfur 0,035 0,01NOTE The maximum tolerance in this table is the allowable excess over the specified requirement and not the heat analysis. 5.2 Skin passing This product is normally supplied skin passed (see 3.2) but may be supplied annealed last (i.e. witho
32、ut a skin pass), if specified by the purchaser on the order. 5.3 Oiling As a deterrent to rusting, a coating of oil is usually applied to the product. The oil is not intended as a drawing or forming lubricant and should be easily removable with degreasing chemicals. On request, the manufacturer shal
33、l advise the purchaser of which type of oil has been used. The product may be ordered not oiled, if required, in which case, the supplier has limited responsibility if oxidation occurs. 5.4 Weldability This product is normally suitable for welding if appropriate welding conditions are selected. 5.5
34、Fabrication qualities 5.5.1 Commercial quality sheet (CR1) is intended for general fabricating purposes where sheet is used in the flat condition or for bending, moderate forming, and welding operations. ISO 2012 All rights reserved 3 ISO 3574:2012(E) 5.5.2 Drawing quality sheet (CR2, CR3, CR4, CR5)
35、 is intended for drawing or severe forming, including welding. It is produced in thicknesses of 0,36 mm and thicker (commonly produced up to 4 mm) and in widths of 600 mm and wider, in coils and cut lengths. Drawing quality sheet is furnished according to all the requirements of this International S
36、tandard, or, by agreement when ordered, to fabricate an identified part, in which case, the mechanical property requirements do not apply. Drawing qualities are identified as follows: CR2 Drawing quality CR3 Deep drawing quality CR4 Deep drawing quality aluminium killed (non-ageing) CR5 Extra deep d
37、rawing quality (stabilized interstitial free) 5.5.3 Interstitial free steel (IF steel) can be applied on orders of CR2, CR3 and CR4, provided that the customer is informed of the substitution and related shipping documents reflect the actual material shipped. 5.6 Strain ageing Cold-reduced sheet, in
38、 qualities CR1, CR2, and CR3 supplied in the skin-passed condition, tends to strain age and this may lead to the following: a) surface markings from stretcher strains (Lders lines) or fluting when the steel is formed; b) deterioration in ductility. Because of these factors, it is essential that the
39、period between final processing at the mill and fabrication be kept to a minimum. Rotation of stock, by using the oldest material first, is important. Stocking of such steels for extended periods of time should be avoided; for optimum performance, the period should not exceed 6 weeks. For skin-passe
40、d sheet in qualities CR1, CR2 and CR3, and with due regard to the foregoing precautions, reasonable freedom can be achieved by effective roller leveling immediately prior to fabrication at the purchasers plant. Freedom from stretcher strain and fluting for a period of six months can be achieved by t
41、he supply of skin-passed non-ageing steels. Grades CR4 or CR5 shall be specified in such cases where Lders lines are not acceptable and where roller leveling is not possible. 5.7 Surface condition The CR1 product surface condition is supplied as specified in 11.1. Drawing quality products are suppli
42、ed with either of the surface qualities A or B. 5.7.1 Surface quality A (unexposed) Imperfections, such as pores, slight imperfections, small marks, minor scratches and slight colouring, which do not affect the formability or the application of surface coatings, are permitted. 5.7.2 Surface quality
43、B (exposed) The better surface shall be free of imperfections, which might affect the uniform appearance of quality coating. The other surface shall at least conform to surface quality A. In the case of delivery of coil and slit coil, the percentage of defects may be greater than in the case of deli
44、very in sheet or cut lengths. The purchaser should take this into account, and the percentage of admissible surface defects may 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 sha
45、ll be such that during subsequent treatment it does not have a deleterious effect on the better surface.4 ISO 2012 All rights reserved ISO 3574:2012(E) 5.8 Surfac e finish Cold-reduced steel sheet is normally produced in a matte finish, dull in appearance, which is suitable for ordinary decorative p
46、ainting but is not recommended for electroplating. When cold-reduced steel sheet is deformed during fabrication, localized areas may roughen to some degree and such affected portions of the part may require hand finishing to prepare the surface for the intended application. 5.9 Application It is des
47、irable that cold-reduced steel sheet be identified for fabrication by the name of the part or by the intended application. Cold-reduced steel sheet of drawing qualities CR2, CR3, CR4 and CR5 may be produced to make an identified part within a properly established breakage allowance, which shall be p
48、reviously agreed between the manufacturer and purchaser. In this case, the part name, the details of fabrication, and special requirements (i.e. exposed or unexposed, freedom from stretcher strain or fluting) shall be specified, and the mechanical properties of Table 4 do not apply. 5.10 Mechanical
49、properties Except when ordered according to an identified part as explained in 5.5, the mechanical properties shall be as given in Table 4 when they are determined on test pieces obtained in accordance with the requirements of Clause 8. The values specified in Table 4 are applicable for the periods indicated in Table 5 from the time that the steel is available for shipment. ISO 2012 All rights reserved 5 ISO 3574:2012(E) Table 4 Mechanical property requirements for cold-rolled steel sheet Quality R emax. aMPa R
