ASTM_A_599_-_A_599M_-_07_2012.pdf

Designation:A599/A599M07(Reapproved 2012)Standard Specification forTin Mill Products,Electrolytic Tin-Coated,Cold-RolledSheet1This standard is issued under the fixed designation A599/A599M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers cold-rolled steel sheet in coilsor in cut lengths,tin-coated by electrodeposition.The productis commonly known as electrolytic tin-coated sheet,and is forapplications that need good solderability,good surfaceappearance,and a degree of corrosion resistance.Tin-coatedsheet is produced to various designations of tin coating,asoutlined in Table 1.1.1.1 Electrolytic tin-coated sheet is customarily availableas commercial steel(CS);drawing steel(DS);deep drawingsteel(DDS);extra deep drawing steel(EDDS),and structuralsteel(SS).The tin coating is available as unmelted or melted.1.2 LimitationsThis specification is applicable to orders ineither inch-pound units(as A599),which is supplied inthicknesses from 0.015 in.to 0.036 in.,or SI units as A599M,which is supplied in thicknesses from 0.381 mm to 0.914 mm.For thicknesses lighter than 0.015 in.0.381 mm,refer toA624/A624M A624M.1.3 Unless the order shows the“M”designation SI units,the product shall be furnished to inch-pound units.The valuesstated in either inch-pound or SI units are to be regarded asstandard.Within the text,the SI units are shown in brackets.The values stated in each system are not exact equivalents;therefore,each system must be used independently of the other.Combining values from the two systems may result in noncon-formance with this specification.2.Referenced Documents2.1 ASTM Standards:2A568/A568M Specification for Steel,Sheet,Carbon,Structural,and High-Strength,Low-Alloy,Hot-Rolled andCold-Rolled,General Requirements forA623 Specification for Tin Mill Products,General Require-mentsA623M Specification for Tin Mill Products,General Re-quirements MetricA624/A624M Specification for Tin Mill Products,Electro-lytic Tin Plate,Single ReducedA630 Test Methods for Determination of Tin CoatingWeights for Electrolytic Tin PlateA700 Practices for Packaging,Marking,and Loading Meth-ods for Steel Products for ShipmentA1008/A1008M Specification for Steel,Sheet,Cold-Rolled,Carbon,Structural,High-Strength Low-Alloy,High-Strength Low-Alloy with Improved Formability,SolutionHardened,and Bake Hardenable3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 chemicaltreatmentapassivatingchemicaltreatment,normally applied to the tinned surface to stabilizethe surface to control tin oxide formation and growth.Sodiumdichromate is most commonly used.Without such treatment,severe tin oxide growth,and its resultant discoloration,is ahazard.Excessive oxide growth may also cause poor solder-ability and poor adhesion of organic coatings.If a specialsurface treatment is required,it should be negotiated with thesupplier.3.2 Finishes:3.2.1 No.5 Finisha shot-blasted and/or otherwise texturedroll base metal finish usually employed on unmelted tin-coatedsheet.3.2.2 No.7 Finisha ground-roll base metal finish usuallyemployed on melted tin-coated sheet.3.2.2.1 DiscussionIt is possible to produce either No.5 orNo.7 Finish as unmelted or melted;however,end applicationis important and should be negotiated with the producer.3.3 melted tin coatingtin coated by electrodeposition on abase steel normally having a ground-roll finish(see 3.2),andthen melted to reflow the tin.The resultant coating has abrighter appearance than unmelted tin.An iron-tin alloy layeris developed during the melting operation,thus reducing theamount of free tin available.Due to the limitations of the1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.20 on Tin Mill Products.Current edition approved March 1,2012.Published November 2012.Originallyapproved in 1969.Last previous edition approved in 2007 as A599/A599M 07.DOI:10.1520/A0599_A0599M-07R12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 reflow section of the plating lines,certain thicknesses may notbe available with a melted finish.3.4 oilan extremely thin oil film furnished on both sur-faces of tinned sheet to minimize abrasion in shearing,coilingor uncoiling,shipping,and handling.Usually dioctyl sebecate(DOS)or acetyl tributyl citrate(ATBC)is used.Surface activeagents such as glycerol mono-oleate may be incorporated intothe lubricant