1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 15211:2012Continuous hot-dip zinc-coatedtwin-roll cast steel sheet ofstructural quality and highstrength steelBS ISO 15211:2012 BRITISH STANDARDNational forewordThis Briti
2、sh Standard is the UK implementation of ISO 15211:2012.The UK participation in its preparation was 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.Th
3、is publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 72830 3ICS 77.140.50Compliance with a British Standard cannot confer im
4、munity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 March 2012.Amendments issued since publicationDate Text affectedBS ISO 15211:2012 ISO 2012Continuous hot-dip zinc-coated twin-roll cast steel sheet of structural q
5、uality and high strength steelTles coules entre cylindres et galvanises en continu par immersion chaud, de qualit destine la construction et en acier haute rsistanceINTERNATIONAL STANDARDISO15211First edition2012-03-15Reference numberISO 15211:2012(E)BS ISO 15211:2012ISO 15211:2012(E)ii ISO 2012 All
6、 rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All 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 a
7、t the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 15211:2012ISO 15211:2012(E) ISO 2012 All rights reserved iiiCon
8、tents PageForeword iv1 Scope 12 Normative references . 13 Terms and definitions . 14 Thickness 25 Conditions of manufacture . 25.1 Chemical composition . 25.2 Mechanical properties 46 Coating . 56.1 Coating mass 56.2 Coating adherence 66.3 Weldability . 76.4 Painting 77 Surface treatment 77.1 Mill p
9、assivation 77.2 Mill phosphating 77.3 Oiling . 78 Dimensional and shape tolerances 89 Sampling 89.1 Chemical composition . 89.2 Tensile test 89.3 Coating tests . 89.4 Retest 810 Test methods 910.1 Tensile test 910.2 Coating properties 911 Designation system 911.1 General . 911.2 Coating type 911.3 C
10、oating mass 911.4 Coating conditions 911.5 Surface treatment 1011.6 Structural grades .1011.7 Example of designation .1011.8 Resubmission .1012 Workmanship 1013 Inspection and acceptance . 1114 Marking . 1115 Information to be supplied by the purchaser 11Annex A (normative) Orders requiring base-met
11、al thickness 13Bibliography .14BS ISO 15211:2012ISO 15211:2012(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 normally carried out through ISO technical co
12、mmittees. 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 the work. ISO collaborates closely with th
13、e 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, Part 2.The main task of technical committees is to prepare International Standards. Draft Internation
14、al 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 casting a vote.Attention is drawn to the possibility that some of the elements of this document may be the
15、 subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 15211 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 12, Continuous mill flat rolled products.iv ISO 2012 All rights reservedBS ISO 15211:2012INTERNATIONAL STANDARD I
16、SO 15211:2012(E)Continuous hot-dip zinc-coated twin-roll cast steel sheet of structural quality and high strength steel1 ScopeThis International Standard specifies the characteristics of continuous hot-dip zinc-coated twin-roll cast steel sheet products of structural quality and high strength steel.
17、The product is intended for applications where resistance to corrosion is of prime importance.The steel sheet is produced in a number of grades, coating mass, ordering conditions and surface treatments.2 Normative referencesThe following referenced documents are indispensable for the application of
18、this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 1460, Metallic coatings Hot dip galvanized coatings on ferrous materials Gravimetric determination of the mass per unit ar
19、eaISO 2178, Non-magnetic coatings on magnetic substrates Measurement of coating thickness Magnetic methodISO 3497, Metallic coatings Measurement of coating thickness X-ray spectrometric methodsISO 6892-1, Metallic materials Tensile testing Part 1: Method of test at room temperatureISO 7438, Metallic
20、 materials Bend testISO 16160, Hot-rolled steel sheet products Dimensional and shape tolerancesISO 16162, Cold-rolled steel sheet products Dimensional and shape tolerancesISO 16163, Continuously hot-dipped coated steel sheet products Dimensional and shape tolerances3 Terms and definitionsFor the pur
21、poses of this document, the following terms and definitions apply.3.1continuous hot-dip zinc-coated steel sheetproduct obtained by hot-dip coating of cold-reduced sheet coils or hot-rolled descaled sheet coils on a continuous zinc-coating line3.2normal coatinglayer formed as a result of unrestricted
22、 growth of zinc or zinc alloy crystals during normal solidificationNOTE Normal coating has a metallic lustre and is the type normally furnished for a wide variety of applications. It may be furnished as coating conditions S or N (see 11.4); however, it can be variable in appearance and is not suitab
23、le for decorative painting.3.3minimized spangle coatingfinish obtained by restricting normal spangle formation during the solidification of the zinc or zinc alloyNOTE This product may have some lack of uniformity in surface appearance within a coil or from coil to coil. ISO 2012 All rights reserved
24、1BS ISO 15211:2012ISO 15211:2012(E)3.4smooth finishsurface produced by skin-passing the coated material in order to achieve an improved smooth surface condition as compared with the normal as-coated product3.5differential coatinglayer having a specified coating-mass designation on one surface and a
25、different coating-mass designation on the other surface3.6skin passlight cold rolling of the zinc-coated steel sheetNOTE 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 occurre
26、nce of a surface condition known as stretcher strain (Luders Lines) or fluting during the fabrication of finished parts. The skin pass also controls and improves flatness. Some increase in hardness and loss of ductility can result from skin passing.3.7twin-roll cast steel sheetsteel sheet produced b
27、y casting to near final thickness directly from the liquid metal with minimal hot-rolling to achieve the final thickness4 Thickness4.1 Zinc-coated structural quality and high strength twin-roll cast steel sheet is produced in thicknesses of up to 2,0 mm after zinc coating, and in widths of up to 2 0
28、00 mm in coils and cut lengths.4.2 Zinc-coated sheets less than 600 mm wide may be slit from wide sheets and may be considered sheets.4.3 The thickness of zinc-coated twin-roll cast sheet steel may be specified as a combination of the base metal and metallic coating, or base metal alone. The purchas
29、er shall indicate on the order which method of specifying thickness is required. In the event that the purchaser does not indicate any preference, the thickness as a combination of the base metal and coating will be provided. Annex A describes the requirements for specifying the thickness as base me
30、tal alone.5 Conditions of manufacture5.1 Chemical compositionThe chemical composition (heat analysis) shall not exceed the values given in Tables 1, 2 and 3. Upon request, a report of the heat analysis shall be made to the purchaser.A verification analysis (product analysis) may be carried out by th
31、e purchaser to verify the specified analysis of the semi-finished or finished steel. The product analysis tolerances are shown in Table 4.The processes used in making the steel and in manufacturing the zinc-coated sheet of structural quality are left to the discretion of the manufacturer. If request
32、ed, the purchaser shall be informed of the steel-making process being used.2 ISO 2012 All rights reservedBS ISO 15211:2012ISO 15211:2012(E)Table 1 Chemical composition Heat analysisMass fractions in per cent maximumBase-metal qualityC Mn P S Sia Structural All grades0,25 1,35 0,035 0,040 aIn this ta
33、ble, “” indicates that there is no requirement, but the analysis shall be reported.Table 2 Chemical requirementsa Heat analysis High strength steelMass fractions in per cent maximumDesignation C Mn P S Sia Vmin.Timin.Nbmin.Na GradecHSS 310 Class 1b0,22 1,35 0,04 0,04 0,008 0,008 0,008 HSS 310 Class
34、2 0,15 1,35 0,04 0,04 0,008 0,008 0,008 HSS 340 Class 1b0,23 1,35 0,04 0,04 0,008 0,008 0,008 HSS 340 Class 2 0,15 1,35 0,04 0,04 0,008 0,008 0,008 HSS 380 Class 1b0.25 1,35 0,04 0,04 0,008 0,008 0,008 HSS 380 Class 2 0,15 1,35 0,04 0,04 0,008 0,008 0,00 HSS 410 Class 1 0,26 1,50 0,04 0,04 0,008 0,0
35、08 0,008 HSS 410 Class 2 0,15 1,50 0,04 0,04 0,008 0,008 0,008 HSS 450 Class 1 0,26 1,50 0,04 0,04 0,008 0,008 0,008 cHSS 450 Class 2 0,15 1,50 0,04 0,04 0,008 0,008 0,008 cHSS 480 Class 1 0,26 1,65 0,04 0,04 0,008 0,008 0,008 cHSS 480 Class 2 0,15 1,65 0,04 0,04 0,008 0,008 0,008 cHSS 550 Class 1 0
36、,26 1,65 0,04 0,04 0,008 0,008 0,008 cHSS 550 Class2 0,15 1,65 0,04 0,04 0,008 0,008 0,008 caIn this table, “” indicates that there is no requirement for Si and N, but the analysis shall be reported.bFor each reduction of 0,01 % below the specified carbon maximum, an increase of 0,06 % manganese abo
37、ve the specified maximum shall be permitted up to a maximum of 1,50 %.cThe purchaser has the option of restricting the nitrogen content. It should be noted that, depending on the microalloying scheme (for example use of vanadium) of the producer, nitrogen is permitted as a deliberate addition. Consi
38、deration should be given to the use of nitrogen-binding elements (for example vanadium and titanium).Table 3 Limits on additional chemical elementsafor structural steelMass fractions in per cent ElementCu Ni Cr Mo Nb V TimaxHeat analysis 0,50 0,30 0,30 0,15 0,008 0,008 0,008Product analysis 0,53 0,3
39、3 0,34 0,16 0,018 0,018 0,018NOTE Each of the elements listed in this table shall be included in the report of the heat analysis. Where the amount of copper, nickel, chromium or molybdenum present is less than 0,02 %, the analysis shall be reported as 0,02 %. ISO 2012 All rights reserved 3BS ISO 152
40、11:2012ISO 15211:2012(E)Table 4 Product analysis tolerancesMass fractions in per cent Element Maximum of specified element Tolerance over the maximum specifiedCarbon 0,26 0,04Manganese 01,65 0,05Phosphorus 0,04 0,01Sulfur 0,04 0,01NOTE The maximum tolerance in this table is the allowable excess over
41、 the specified requirement and not the heat.5.2 Mechanical propertiesStructural quality and high strength grades shall satisfy the mechanical properties shown in Tables 5 and 6. On request, a report of the mechanical properties shall be made to the purchaser.Table 5 Mechanical properties of structur
42、al quality twin-roll cast steel sheetGradeRemin.aMPaRmmin.MPaA, min.be 2 mmLo= 50 mm Lo= 80 mmHR275 275 380 15 14HR340 340 340 9 8HR380 380 380 8 7HR410 410 410 7 6HR480 480 480 6 5HR550 550 550 5 4Re= lower yield strengthRm= tensile strengthA = percentage elongation after fractureLo= gauge length o
43、n test piecee = thickness of steel sheet, in millimetres1 MPa = 1 N/mm2aThe yield stress specified in this table shall be the lower yield stress, Rel. The values may also be measured by 0,5 % total elongation proof stress (proof stress under load) or by 0,2 % offset where a definite yield phenomenon
44、 is not present. Where upper yield stress, ReH, is specified, the values shall be 20 N/mm2above the Relvalues for each grade.bUse either Lo= 50 mm or Lo= 80 mm to measure elongation. For material up to and including 0,6 mm in thickness, the elongation values in this table shall be reduced by 2.4 ISO
45、 2012 All rights reservedBS ISO 15211:2012ISO 15211:2012(E)Table 6 Mechanical properties for hot-rolled twin-roll cast high strength steel sheetGradeRemin.aMPaRmmin.MPaA min.be 2Lo= 50 mm Lo= 80 mmHSS 310 Class 1 310 410 18 17HSS 310 Class 2 310 380 18 17HSS 340 Class 1 340 450 15 14HSS 340 Class 2
46、340 410 15 14HSS 380 Class 1 380 480 13 12HSS 380 Class 2 380 450 13 12HSS 410 Class 1 410 520 11 10HSS 410 Class 2 410 480 11 10HSS 450 Class 1 450 550 10 9HSS 450 Class 2 450 520 10 9HSS 480 Class 1 480 585 8 7HSS 480 Class 2 480 550 8 7HSS 550 Class 1 550 620 7 6HSS 550 Class 2 550 565 7 6Re= yie
47、ld strengthRm= tensile strengthA = percentage elongation after fractureLo= gauge length on test piecee = thickness of steel sheet, in millimetres1 MPa = 1 N/mm2aThe yield strength may be measured either by 0,5 % elongation proof stress, Rt0,5(proof stress under load) or by 0,2 % offset, Rp0,2, where
48、 a definite yield strength phenomenon is not present.bFor thicknesses up to 2 mm, use either Lo= 50 mm or Lo80 mm. In cases of dispute, however, only the results obtained on a 50 mm test piece shall be valid.6 Coating6.1 Coating massThe coating mass shall conform to the limits for the coating design
49、ations shown in Table 7. The coating mass is the total amount of zinc on both surfaces of the sheet, expressed in grams per square metre (g/m2) of sheet. The coating mass of differentially coated material shall be agreed upon between the interested parties. If a maximum coating mass is required, the manufacturer shall be notified at the time of ordering. ISO 2012 All rights reserved 5BS ISO 15211:2012ISO 15211:2012(E)Table 7 Mass of coating Tot
