1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 5950:2012Electrolytic tin-coated cold-reduced carbon steel sheetof commercial and drawingqualitiesBS ISO 5950:2012 BRITISH STANDARDNational forewordThis British Standard i
2、s the UK implementation of ISO 5950:2012. Itsupersedes BS ISO 5950:2008 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee ISE/109, Coated and Uncoated Flat Products to be Usedfor Cold Forming.A list of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 beobt
3、ained on request to its secretary.This 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 77260 3ICS 77.140.50Compliance with
4、 a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 November 2012.Amendments issued since publicationDate Text affectedBS ISO 5950:2012 ISO 2012Electrolytic tin-coated cold-reduce
5、d carbon steel sheet of commercial and drawing qualitiesTles en acier au carbone lamines froid, revtues en continu dun dpt lectrolytique dtain, de qualits commerciale et pour emboutissageINTERNATIONAL STANDARDISO5950Fifth edition2012-11-01Reference numberISO 5950:2012(E)BS ISO 5950:2012ISO 5950:2012
6、(E)ii ISO 2012 All 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
7、 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. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 5950:2012ISO 5950:2012(E) ISO 2012 All rights
8、 reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Designation system 25 Dimensions . 26 Conditions of manufacture 26.1 Chemical composition 26.2 Coating mass . 36.3 Weldability 46.4 Fabrication qualities. 46.5 Mill passivation . 46.6 Coating conditi
9、on 46.7 Application . 56.8 Mechanical properties 56.9 Surface finish 56.10 Oiling 57 Dimensional tolerances 58 Sampling 68.1 Tensile test 68.2 Tests for mass of coating 69 Test methods . 69.1 Tensile test (base metal) . 69.2 Coating tests 610 Retests . 610.1 Machining and flaws. 610.2 Additional tes
10、ts . 611 Resubmission . 712 Workmanship 713 Inspection and acceptance . 714 Coil size . 715 Marking 716 Information to be supplied by the purchaser. 8Bibliography 9BS ISO 5950:2012ISO 5950:2012(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national s
11、tandards 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 the right to be represented on that committee. International
12、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.International Standards are drafted in accordance with the rules giv
13、en 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. Publication as an International Standard requires approval by at least 7
14、5 % 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.ISO 5950 was prepared by Technical Committee ISO/TC 17, Steel,
15、 Subcommittee SC 12, Continuous mill flat rolled products.This fifth edition cancels and replaces the fourth edition (ISO 5950:2008), which has been technically revised.iv ISO 2012 All rights reservedBS ISO 5950:2012INTERNATIONAL STANDARD ISO 5950:2012(E)Electrolytic tin-coated cold-reduced carbon s
16、teel sheet of commercial and drawing qualities1 Scope1.1 This International Standard applies to cold-reduced carbon steel sheet of commercial and drawing qualities coated in coil or cut length forms by electro-deposition of tin. The product is commonly known as electrolytic tin-coated sheet and is u
17、sed where solderability is desired, appearance is important, or a degree of corrosion resistance under specific conditions is advantageous and coating mass can be specified. The coating is expressed as the total coating on both surfaces, in grams per square metre. The coating mass specified should b
18、e compatible with the desired service life, thickness of the base metal and the forming requirements involved. A designation system (Clause 4) includes the coating designation, coating condition and quality.1.2 This International Standard does not cover tinplate and blackplate.2 Normative references
19、The following referenced documents are indispensable for the application of 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 6892-1, Metallic materials Tensile testing Par
20、t 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 following terms and definitions apply.3.1electrolytic tin-coated sheetproduct obtained by electrolytic deposition of tin on
21、 cold-reduced steel sheet on a continuous electrolytic tinning line to produce either tin-coated coils or tin-coated cut lengths3.2skin passlight cold-rolling of the cold-reduced and annealed sheet prior to electro-tinningNOTE The purposes of skin passing are one or more of the following:a) to minim
22、ize the appearance of coil breaks, stretcher strains and fluting;b) to control the shape;c) to obtain the required surface finish.An increase in hardness and some loss in ductility will result from skin passing.3.3aluminum killedsteel which has been deoxidized with aluminum sufficient to prevent the
23、 evolution of gas during solidification ISO 2012 All rights reserved 1BS ISO 5950:2012ISO 5950:2012(E)4 Designation systemThe as-produced electrolytic tin-coated sheet coatings are designated as SN as shown in Table 4. The coating mass designation follows the SN and three spaces are allocated for co
24、ating mass designation. If only two spaces are required, such as for designation 56, then the 56 is preceded by a “0” to fill computer space and is shown as “056”. Since this product is always skin-passed, the section in this designation system usually reserved for S or N will be used to indicate wh
25、ere the tin has been reflowed, or whether it is “matt” or not reflowed (see 6.6 and 6.9). Therefore, the designations for this tin condition will be BR: Bright reflowed, fused, melted, MA: Matt, dull, not reflowed, unmelted.The numbers 01, 02, 03 and 04 are common to other standards indicating the q
26、ualities of commercial, drawing, deep drawing, and deep drawing aluminium killed.EXAMPLE SN056BR03 is a complete designation, including coating, coating mass, coating condition and quality signifying: SN: Tin coating, 056: Coating designation (Table 4), BR: Bright; tin has been reflowed, 03: Deep dr
27、awing quality.5 DimensionsElectrolytic tin-coated sheet is normally produced in thicknesses from 0,50 mm to 0,85 mm and widths of 600 mm to 1 050 mm, in coils and cut lengths.NOTE Some world markets define “electrolytic tinplate” as having a maximum thickness of 0,38 mm, in which case, the thickness
28、 range for “electrolytic tin-coated sheet” will have a minimum of 0,38 mm.6 Conditions of manufacture6.1 Chemical compositionThe chemical composition (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
29、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 present 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 an
30、alysis of the product and shall take into consideration any normal heterogeneity. Non-killed steels (such as rimmed or capped steels) are not technologically suited to product analysis. For killed steels, the sampling method and deviation limits shall be agreed upon between the interested parties at
31、 the time of ordering. The product analysis tolerances are shown in Table 3.The processes used in making the steel and in manufacturing tin-coated sheet are left to the discretion of the manufacturer. When requested, the purchaser shall be informed of the steel-making process used.2 ISO 2012 All rig
32、hts reservedBS ISO 5950:2012ISO 5950:2012(E)Table 1 Chemical composition (heat analysis)Mass fractions in percentQuality C max.Mn max.aP max.aS max.Designation Name01 Commercial 0,15 0,60 0,03 0,03502 Drawingb0,10 0,50 0,03 0,03503 Deep drawingb0,08 0,45 0,02 0,0304 Deep drawing aluminum killedb(non
33、-ageing) 0,06 0,45 0,02 0,03aHigher maximum required for certain applications subject to agreement.bIf interstitial free (IF Steel) is to be applied to 02, 03 and 04 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 st
34、abilized.Table 2 Limits on additional chemical elementsMass fractions in percentElementsaHeat analysis max.Product analysis max.Cub0,20 0,23Nib0,20 0,23Crb,c0,15 0,19Mob,c0,06 0,07Nbd0,008 0,018Vd0,008 0,018Tid0,008 0,018aEach of the elements listed in this table shall be included in the report of t
35、he heat analysis. When the amount of copper, nickel, chromium or molybdenum present is less than 0,02 %, the analysis may be reported as “ 0,02 %”.bThe sum of copper, nickel, chromium and molybdenum shall not exceed 0,50 % on heat analysis. When one or more of these elements is specified, the sum do
36、es not apply; in which case, only the individual limits on the remaining elements will apply.cThe sum of chromium and molybdenum shall not exceed 0,16 % on heat analysis. When one or more of these elements is specified, the sum does not apply; in which case, only the individual limits on the remaini
37、ng elements will apply.dFor stabilized steels, the maximum for titanium is 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 tolerancesMass fractions in percentElement Maximum of specified element
38、Tolerance over maximum specifiedCarbon 0,15 0,03Manganese 0,60 0,03Phosphorus 0,03 0,01Sulfur 0,035 0,01NOTE The maximum tolerance in this table is the allowable excess over the specified requirement and not the heat analysis.6.2 Coating massThe coating mass shall conform to the requirements present
39、ed in Table 4 for the specific coating designation. The coating mass is the total amount of the tin, including both sides of the sheet, expressed ISO 2012 All rights reserved 3BS ISO 5950:2012ISO 5950:2012(E)in grams per square metre (g/m2) of sheet. Methods for checking that the material complies w
40、ith this International Standard are given in 8.2 and 9.2.Table 4 Mass of coating (total both sides)Coating designation Nominal coating Minimum coating mass limitsTriple spot test check limits Single spot test check limitsg/m2g/m2(of sheet) g/m2(of sheet)SN056 5,6 3,7 2,8SN112 11,2 7,3 5,6SN168 16,8
41、11,0 8,2SN224 22,4 14,6 11,0Because of the many variables and changing conditions that are characteristic of continuous tin coating, the mass of coating is not always evenly divided between the two surfaces of a tin-coated sheet, neither is the tin coating evenly distributed from edge to edge. Howev
42、er, it can normally be expected that not less than 40 % of the single-spot check limit will be found on either surface.6.3 WeldabilityThe product is suitable for welding if appropriate welding conditions are selected; however, because of its excellent solderability, welding is seldom performed.6.4 F
43、abrication qualities6.4.1 Commercial-quality electrolytic tin-coated sheet (quality 01) is intended for general fabricating purposes where sheet is used in the flat state, or for bending or moderate forming.6.4.2 Drawing quality electrolytic tin-coated sheet (qualities 02, 03, 04) is intended for dr
44、awing or severe forming. It is furnished according to the requirements of this International Standard or, with agreement where ordered, to fabricate an identified part, in which case, the mechanical properties in Table 5 do not apply. Drawing qualities are identified as follows: 02 Drawing quality 0
45、3 Deep drawing quality 04 Deep drawing quality aluminium killed (non-ageing)6.4.3 Interstitial free steel (IF Steel) can be applied in orders of 02, 03 and 04, provided that the customer is informed of the substitution and that related shipping documents reflect the actual material shipped.6.5 Mill
46、passivationA passivating chemical or electrochemical treatment is applied to the surface of electrolytic tin-coated sheet to stabilize the plate surface characteristics compatible with a specific application.6.6 Coating conditionThe as-produced tin-coated sheet has a dull (matt) appearance (Clause 4
47、 and 6.9). If it is heated to the melting point of tin, the tin reflows and has a bright (fused, melted) appearance. Some iron-tin alloy will also form at the steel surface interface during this heating process.Normally “matt” finish sheet is produced from cold-reduced sheet having a “shot-blasted”
48、surface, and “bright” finish sheet is produced from cold-reduced sheet having “ground” roll surfaces (6.9). All tinning lines have strip thickness limits on bright finish sheet because of melting limitations.4 ISO 2012 All rights reservedBS ISO 5950:2012ISO 5950:2012(E)6.7 ApplicationTin-coated stee
49、l shall be identified for fabrication by the name of the part or by the intended application. Steel sheet of drawing qualities (02, 03 and 04) may be produced to make an identified part, which shall be previously agreed between the manufacturer and purchaser. In this case, the part name, the details of fabrication and special requirements (freedom from stretcher strains or fluting, coating performance requirements) shall be specified and the mechanical properties of Table 5 do not apply.6.8 Mechanical propertiesExcept when or
