1、raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication BS ISO 5950:2012 Electrolytic tin-coated cold- reduced carbon steel sheet of commercial and drawing qualitiesBS ISO 5950:2012 BRITISH STANDARD National foreword This British S
2、tandard is the UK implementation of ISO 5950:2012. It supersedes BS ISO 5950:2008 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee ISE/109, Coated and Uncoated Flat Products to be Used for Cold Forming. A list of organizations represented on this commi
3、ttee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012. Published by BSI Standards Limited 2012 ISBN 978 0 580 77260 3 ICS 77.
4、140.50 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2012. Amendments issued since publication Date Text affectedBS ISO 5950:2012 ISO 2012 Electro
5、lytic tin-coated cold-reduced carbon steel sheet of commercial and drawing qualities Tles en acier au carbone lamines froid, revtues en continu dun dpt lectrolytique dtain, de qualits commerciale et pour emboutissage INTERNATIONAL STANDARD ISO 5950 Fifth edition 2012-11-01 Reference number ISO 5950:
6、2012(E)BS ISO 5950:2012ISO 5950:2012(E)ii ISO 2012 All rights reserved COPYRIGHT 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 mi
7、crofilm, without permission in writing from either ISO at the address below 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 SwitzerlandBS ISO
8、5950:2012ISO 5950:2012(E) ISO 2012 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Normative references 1 3 T erms and definitions . 1 4 Designation system 2 5 Dimensions . 2 6 Conditions of manufacture 2 6.1 Chemical composition 2 6.2 Coating mass . 3 6.3 Weldability 4 6.4 Fabricati
9、on qualities. 4 6.5 Mill passivation . 4 6.6 Coating condition 4 6.7 Application . 5 6.8 Mechanical properties 5 6.9 Surface finish 5 6.10 Oiling 5 7 Dimensional tolerances 5 8 Sampling 6 8.1 Tensile test 6 8.2 Tests for mass of coating 6 9 Test methods . 6 9.1 Tensile test (base metal) . 6 9.2 Coat
10、ing tests 6 10 Retests . 6 10.1 Machining and flaws. 6 10.2 Additional tests . 6 11 Resubmission . 7 12 Workmanship 7 13 Inspection and acceptance . 7 14 Coil size . 7 15 Marking 7 16 Information to be supplied by the purchaser. 8 Bibliography 9BS ISO 5950:2012ISO 5950:2012(E) Foreword ISO (the Inte
11、rnational 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 committees. Each member body interested in a subject for which a technical committee has
12、 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 the International Electrotechnical Commission (IEC) on all matters of electrotechnical s
13、tandardization. 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 International Standards adopted by the technical committees are circulated to the member bodies
14、 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 subject of patent rights. ISO shall not be held responsible for identifying any or
15、 all such patent rights. ISO 5950 was prepared by Technical Committee ISO/TC 17, Steel, 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
16、:2012INTERNATIONAL ST ANDARD ISO 5950:2012(E) Electrolytic tin-coated cold-reduced carbon steel sheet of commercial and drawing qualities 1 Scope 1.1 This International Standard applies to cold-reduced carbon steel sheet of commercial and drawing qualities coated in coil or cut length forms by elect
17、ro-deposition of tin. The product is commonly known as electrolytic tin-coated sheet and is used 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 t
18、otal coating on both surfaces, in grams per square metre. The coating mass specified should be 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.
19、 1.2 This International Standard does not cover tinplate and blackplate. 2 Normative references 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 reference
20、d document (including any amendments) applies. ISO 6892-1, Metallic materials Tensile testing Part 1: Method of test at room temperature ISO 16162, Cold-rolled steel sheet products Dimensional and shape tolerances 3 T erms a nd definiti ons For the purposes of this document, the following terms and
21、definitions apply. 3.1 electrolytic tin-coated sheet product obtained by electrolytic deposition of tin on cold-reduced steel sheet on a continuous electrolytic tinning line to produce either tin-coated coils or tin-coated cut lengths 3.2 skin pass light cold-rolling of the cold-reduced and annealed
22、 sheet prior to electro-tinning NOTE The purposes of skin passing are one or more of the following:a) to minimize 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 res
23、ult from skin passing. 3.3 aluminum killed steel which has been deoxidized with aluminum sufficient to prevent the evolution of gas during solidification ISO 2012 All rights reserved 1BS ISO 5950:2012ISO 5950:2012(E) 4 Designation system The as-produced electrolytic tin-coated sheet coatings are des
24、ignated as SN as shown in Table 4. The coating mass designation follows the SN and three spaces are allocated for coating 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 i
25、s always skin-passed, the section in this designation system usually reserved for S or N will be used to indicate where 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,
26、 MA: Matt, dull, not reflowed, unmelted. The numbers 01, 02, 03 and 04 are common to other standards indicating the qualities of commercial, drawing, deep drawing, and deep drawing aluminium killed. EXAMPLE SN056BR03 is a complete designation, including coating, coating mass, coating condition and q
27、uality signifying: SN: Tin coating, 056: Coating designation (Table 4), BR: Bright; tin has been reflowed, 03: Deep drawing quality. 5 Dimensions Electrolytic 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
28、 Some world markets define “electrolytic tinplate” as having a maximum thickness of 0,38 mm, in which case, the thickness range for “electrolytic tin-coated sheet” will have a minimum of 0,38 mm. 6 Conditions of manufacture 6.1 Chemical composition The chemical composition (heat analysis) shall not
29、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 present is less that 0,02 %, the
30、 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 technologically suited to produc
31、t 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 tin-coated sheet are left to the disc
32、retion of the manufacturer. When requested, the purchaser shall be informed of the steel-making process used.2 ISO 2012 All rights reservedBS ISO 5950:2012ISO 5950:2012(E) Table 1 Chemical composition (heat analysis) Mass fractions in percent Quality C max. Mn max. a P max. a S max. Designation Name
33、 01 Commercial 0,15 0,60 0,03 0,035 02 Drawing b 0,10 0,50 0,03 0,035 03 Deep drawing b 0,08 0,45 0,02 0,03 04 Deep drawing aluminum killed b(non-ageing) 0,06 0,45 0,02 0,03 aHigher maximum required for certain applications subject to agreement. bIf interstitial free (IF Steel) is to be applied to 0
34、2, 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 stabilized. Table 2 Limits on additional chemical elements Mass fractions in percent Elements a Heat analysis max. Product analysis max. Cu b 0,20 0,23 Ni
35、b 0,20 0,23 Cr b,c 0,15 0,19 Mo b,c 0,06 0,07 Nb d 0,008 0,018 V d 0,008 0,018 Ti d 0,008 0,018 aEach of the elements listed in this table shall be included in the report of the heat analysis. When the amount of copper, nickel, chromium or molybdenum present is less than 0,02 %, the analysis may be
36、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 does not apply; in which case, only the individual limits on the remaining elements will apply. cThe sum of chromium and molyb
37、denum 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 remaining elements will apply. dFor stabilized steels, the maximum for titanium is 0,15 %, and the maximum for each of niobium and
38、 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 m u m of s p e c i f ie d e le m e n t T o le r a n c e o v e r m a x i m u m s p e c i f ie d Carbon 0,15 0,03 Manganese 0,60 0,03 Phosphor
39、us 0,03 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. 6.2 Coating mass The coating mass shall conform to the requirements presented in Table 4 for the specific coating designation. The coating mass is
40、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/m 2 ) of sheet. Methods for checking that the material complies with this International Standard are given in 8.2 and 9.2. Table 4 Mas
41、s of coating (total both sides) Coating designation Nominal coating Minimum coating mass limits Triple spot test check limits Single spot test check limits g/m 2 g/m 2(of sheet) g/m 2(of sheet) SN056 5,6 3,7 2,8 SN112 11,2 7, 3 5,6 SN168 16,8 11,0 8,2 SN224 22,4 14,6 11,0 Because of the many variabl
42、es 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. However, it can normally be expected that not less than 40 %
43、 of the single-spot check limit will be found on either surface. 6.3 Weldability The product is suitable for welding if appropriate welding conditions are selected; however, because of its excellent solderability, welding is seldom performed. 6.4 Fabrication qualities 6.4.1 Commercial-quality electr
44、olytic 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 drawing or severe forming. It is furnished according
45、 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 03 Deep drawing quality 04 Deep drawing quality alu
46、minium 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 passivation A passivating chemical or electroche
47、mical 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 condition The as-produced tin-coated sheet has a dull (matt) appearance (Clause 4 and 6.9). If it is heated to the melting poi
48、nt 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” surface, and “bright” finish sheet is produc
49、ed 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 Application Tin-coated steel 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.
