1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 15179:2012Hot-rolled twin-roll cast steelsheet of structural quality andhigh strength steelBS ISO 15179:2012 BRITISH STANDARDNational forewordThis British Standard is the
2、UK implementation of ISO 15179:2012.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.This publication does
3、 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 72828 0ICS 77.140.50Compliance with a British Standard cannot confer immunity fromlegal ob
4、ligations.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 15179:2012 ISO 2012Hot-rolled twin-roll cast steel sheet of structural quality and high strength steelTles en a
5、cier de construction et en acier haute rsistance lamines chaud par coule entre cylindresINTERNATIONAL STANDARDISO15179First edition2012-03-15Reference numberISO 15179:2012(E)BS ISO 15179:2012ISO 15179:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights reserved. Unl
6、ess 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 below or ISOs member body in the country of the requester.ISO c
7、opyright 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 15179:2012ISO 15179:2012(E) ISO 2012 All rights reserved iiiContents PageForeword iv1 Scope 12 Normative references . 13 Terms and definitio
8、ns . 14 Thickness 25 Conditions of manufacture . 25.1 Steelmaking 25.2 Chemical composition . 25.3 Chemical analysis . 25.4 Weldability . 45.5 Application 45.6 Mechanical properties 45.7 Surface condition 65.8 Oiling . 66 Dimensional tolerances . 67 Sampling 78 Mechanical property tests . 78.1 Gener
9、al . 78.2 Retests . 78.3 Machining and flaws . 78.4 Elongation . 79 Resubmission . 710 Workmanship 711 Inspection and acceptance . 712 Coil size 813 Marking . 814 Information to be supplied by the purchaser 8Bibliography . 9BS ISO 15179:2012ISO 15179:2012(E)ForewordISO (the International Organizatio
10、n 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 committees. Each member body interested in a subject for which a technical committee has been established has
11、 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 the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.Intern
12、ational 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 International Standards adopted by the technical committees are circulated to the member bodies for voting. Publicatio
13、n 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 subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
14、ISO 15179 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 12, Continuous mill flat rolled products.iv ISO 2012 All rights reservedBS ISO 15179:2012INTERNATIONAL STANDARD ISO 15179:2012(E)Hot-rolled twin-roll cast steel sheet of structural quality and high strength steel1 ScopeT
15、his International Standard specifies the characteristics of hot-rolled twin-roll cast steel sheet of structural quality and high strength steel. The product is intended for applications where specific mechanical properties are required. It is generally used in the delivered condition and is intended
16、 for bolted, riveted or welded structures. This product is produced on a wide strip mill, not a plate mill.Structural quality twin-roll cast steel sheet is a carbon steel produced to specified mechanical properties and is available in a number of grades (see Table 5).High strength twin-roll cast ste
17、el sheet, strengthened by microalloys, is produced to specified mechanical properties and is available in a number of grades and classes (see Table 6).2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the editi
18、on cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 6892-1, Metallic materials Tensile testing Part 1: Method of test at room temperatureISO 16160, Hot-rolled steel sheet products Dimensional and shape tolerances3 Terms and d
19、efinitionsFor the purposes of this document, the following terms and definitions apply.3.1microalloying elementelement, such as niobium, vanadium, titanium, added singly or in combination to obtain higher strength levels combined with better formability, weldability and toughness as compared with no
20、n-alloy steel produced to equivalent strength3.2hot-rolled descaled steel sheethot-rolled steel sheet from which oxide or scale has been removed, commonly by pickling in an acid solution3.3mill edgenormal side edge without any definite contour produced in hot rollingNOTE Mill edges may contain some
21、irregularities, such as cracked or torn edges or thin (feathered) edges.3.4sheared edgeedge product normal edge obtained by shearing, slitting or trimming a mill edge productNOTE Normal processing does not necessarily provide a definite positioning of the slitting burr. ISO 2012 All rights reserved
22、1BS ISO 15179:2012ISO 15179:2012(E)3.5twin-roll cast steel sheetsteel sheet produced by casting to near final thickness directly from the liquid metal with minimal hot rolling to achieve the final thickness4 Thickness4.1 This product is commonly produced in thicknesses from 0,7 mm to 2,0 mm, inclusi
23、ve, and widths of up to 2 000 mm maximum.4.2 Hot-rolled sheets less than 600 mm wide may be slit from wide sheets and may be considered sheets.5 Conditions of manufacture5.1 SteelmakingUnless otherwise agreed by the interested parties, processes used in making the steel and in manufacturing hot-roll
24、ed sheet are left to the discretion of the manufacturer. On request, the purchaser shall be informed of the steel-making process being used.5.2 Chemical compositionThe chemical composition (heat analysis) shall not exceed the values given in Tables 1, 2 and 3.5.3 Chemical analysis5.3.1 Heat analysis
25、A heat analysis of each heat of steel shall be carried out by the manufacturer in order to determine the percentage of all appropriate elements listed in Tables 1, 2 and 3. On request, this analysis shall be reported to the purchaser or his representative.5.3.2 Product analysisA product analysis may
26、 be carried out by the purchaser in order to verify the specified analysis of the product. For killed steels, the sampling method shall be agreed upon between the interested parties at the time of ordering. The product analysis tolerances shall be in accordance with Table 4.Table 1 Chemical requirem
27、ents Heat analysis structural qualitya Mass fractions in per cent maximumClass C Mn P S SiAll grades A 0,25 1,35 0,040 0,035 aWhere the “” appears in this table, there is no requirement, but the analysis shall be reported.2 ISO 2012 All rights reservedBS ISO 15179:2012ISO 15179:2012(E)Table 2 Chemic
28、al requirementsa Heat analysis High strength steelMass fractions in per cent maximumDesignation C Mn P S SiaVdmin.Tidmin.Nbdmin.NaHSScGrade 310 Class 1b0,22 1,35 0,04 0,04 0,008 0,008 0,008 Grade 310 Class 2 0,15 1,35 0,04 0,04 0,008 0,008 0,008 Grade 340 Class 1b0,23 1,35 0,04 0,04 0,008 0,008 0,00
29、8 Grade 340 Class 2 0,15 1,35 0,04 0,04 0,008 0,008 0,008 Grade 380 Class 1b0.25 1,35 0,04 0,04 0,008 0,00 0,008 Grade 380 Class 2 0,15 1,35 0,04 0,04 0,008 0,008 0,008 Grade 410 Class 1 0,26 1,50 0,04 0,04 0,008 0,008 0,008 Grade 410 Class 2 0,15 1,50 0,04 0,04 0,008 0,008 0,008 Grade 450 Class 1 0
30、,26 1,50 0,04 0,04 0,008 0,008 0,008 cGrade 450 Class 2 0,15 1,50 0,04 0,04 0,008 0,008 0,008 cGrade 480 Class 1 0,26 1,65 0,04 0,04 0,008 0,008 0,008 cGrade 480 Class 2 0,15 1,65 0,04 0,04 0,008 0,008 0,008 cGrade 550 Class 1 0,26 1,65 0,04 0,04 0,008 0,008 0,008 cGrade 550 Class2 0,15 1,65 0,04 0,
31、04 0,008 0,008 0,008 ca Where the “” appears in this table, there is no requirement, but the analysis shall be reported.b For each reduction of 0,01 % below the specified carbon maximum, an increase of 0,06 % manganese above the specified maximum shall be permitted up to a maximum of 1,50 %.c The pu
32、rchaser 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. Consideration should be given to the use of nitrogen-binding elements (for example
33、 vanadium and titanium).d The producer shall add at least one or more of the elements V, Ti or Nb.Table 3 Limits on additional chemical elementsa Structural qualityMass fractions in per centElementCumax.Nmax.Crmax.Nbmax.Momax.Vmax.Timax.Heat analysis 0,50 0,30 0,30 0,008 0,15 0,008 0,008Product anal
34、ysis 0,53 0,33 0,34 0,018 0,16 0,018 0,018aEach 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 is less than 0,02 %, the analysis shall be reported as 0,02 %. ISO 2012 All rights reserved 3BS ISO 15
35、179:2012ISO 15179:2012(E)Table 4 Product analysis tolerancesElement Maximum of specified element%Tolerance over the maximum specified%Carbon 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 the specified requiremen
36、t and not the heat.5.4 WeldabilityThis product is normally suitable for welding if appropriate welding conditions are selected. For non-descaled steel, it may be necessary to remove the scale or oxide depending upon the welding method. As the carbon increases above 0,15 %, spot welding becomes incre
37、asingly difficult.5.5 ApplicationIt is desirable that hot-rolled twin-roll cast steel sheet be identified for fabrication by the name of the part or by the intended application. Proper identification of the part may include visual examination, prints or description, or a combination of these.5.6 Mec
38、hanical properties5.6.1 At the time that the steel is made available for shipment, the mechanical properties shall be as stated in Tables 5 and 6, where they are determined on test pieces obtained in accordance with the requirements of Clause 7.5.6.2 Either ReLor ReHmay be specified, but not both.4
39、ISO 2012 All rights reservedBS ISO 15179:2012ISO 15179:2012(E)Table 5 Mechanical properties of structural 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
40、4Re= lower yield strengthRm= tensile strengthA = percentage elongation after fractureLo= gauge length on test piecee = thickness of steel sheet, in millimetre(s)1 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 % tot
41、al elongation proof stress (proof stress under load) or by 0,2 % offset where a definite yield phenomenon 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
42、 up to and including 0,6 mm in thickness, the elongation values in this table shall be reduced by 2. ISO 2012 All rights reserved 5BS ISO 15179:2012ISO 15179:2012(E)Table 6 Mechanical properties for hot-rolled twin-roll cast high strength steel sheetGradeRemin.aMPaRmmin.MPaA min.be 2Lo= 50 mm Lo= 80
43、 mmHSS 310 Class 1 310 410 18 17HSS 310 Class 2 310 380 18 17HSS 340 Class 1 340 450 15 14HSS 340 Class 2 340 410 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 C
44、lass 1 480 585 8 7HSS 480 Class 2 480 550 8 7HSS 550 Class 1 550 565 7 6HSS 550 Class 2 550 620 7 6Re= yield strengthRm= tensile strengthA = percentage elongation after fractureLo= gauge length on test piecee = thickness of steel sheet, in millimetre(s)1 MPa = 1 N/mm2a The yield strength may be meas
45、ured either by 0,5 % elongation proof stress, Rt0,5(proof stress under load) or by 0,2 % offset, Rp0,2, where a definite yield strength phenomenon is not present.bFor thicknesses up to 2 mm, use either Lo= 50 mm or Lo= 80 mm. In cases of dispute, however, only the results obtained on a 50 mm test pi
46、ece shall be valid.5.7 Surface conditionOxide or scale on hot-rolled steel sheet is subject to variations in thickness, adherence and colour. Removal of the oxide or scale by pickling or grit blasting can disclose surface imperfections not readily visible prior to this operation.5.8 OilingAs a deter
47、rent to rusting, a coating of oil is usually applied to hot-rolled twin-roll cast descaled steel sheet, but may be furnished not oiled, if required. The oil is not intended as a forming lubricant and shall be easily removable using degreasing chemicals. On request, the manufacturer shall advise the
48、purchaser which type of oil has been used. Hot-rolled twin-roll cast descaled sheet may be ordered not oiled; in which case, the supplier has limited responsibility if oxidation occurs.6 Dimensional tolerancesDimensional tolerances applicable to hot-rolled steel sheets shall be as given in ISO 16160
49、.Restricted thickness tolerances are given in ISO 16160.6 ISO 2012 All rights reservedBS ISO 15179:2012ISO 15179:2012(E)7 SamplingOne representative sample for the tensile test required in Tables 5 and 6 shall be taken from each lot of sheet for shipment. A lot consists of 50 t, or less, of the same grade and class rolled to the same thickness and condition.8 Mechanical property tests8.1 GeneralThe tensile test shall be carried out in accordance with ISO 68
