ASTM_A_879_-_A_879M_-_12_2017.pdf

Designation:A879/A879M12(Reapproved 2017)Standard Specification forSteel Sheet,Zinc Coated by the Electrolytic Process forApplications Requiring Designation of the Coating Mass onEach Surface1This standard is issued under the fixed designation A879/A879M;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 zinc coatings applied by theelectrolytic process to hot-rolled and cold-rolled steel sheet.The coating has a smooth,spangle-free surface.The zinc-coated sheet covered in this specification is produced in a widerange of coating masses to provide coatings that are compatiblewith the anticipated service life required.The coating massvaries,from very thin coatings that are usually painted toprovide good service,to relatively heavy masses that providegood corrosion resistance in the bare(unpainted)condition.1.2 The product shall be coated on one or both surfaces withequal or differential coating masses on the two surfaces.Sheetcoated with equal coating masses on each surface has similarlevels of corrosion protection on each surface.Often,however,a higher level of corrosion protection is required on one surfacethan is required on the other.Thus one surface is specified tohave a heavier coating mass than the other.Either surface,when specified to be painted will provide additional corrosionprotection as compared to an unpainted surface.1.3 This coating process has essentially no effect on the basemetal mechanical properties and use is permitted on any gradeof hot-or cold-rolled steel sheet.The coated sheet is availableas Commercial Steel(CS),Drawing Steel(DS),Deep DrawingSteel(DDS),Extra-Deep Drawing Steel(EDDS),StructuralSteel(SS),High-Strength Low-Alloy Steel(HSLAS),High-Strength Low-Alloy Steel with Improved Formability(HSLAS-F),Solution-Hardened Steel(SHS),or Bake-Hardenable Steel(BHS),see Specifications A1008/A1008Mand A1011/A1011M.1.4 The values stated in either SI or inch-pound units are tobe regarded separately as the standard.Within the text,the SIunits are shown in brackets.The values stated in each systemare not exact equivalents;therefore,each system must be usedindependently of the other.2.Referenced Documents2.1 ASTM Standards:2A90/A90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA754/A754M Test Method for Coating Weight(Mass)ofMetallic Coatings on Steel by X-Ray FluorescenceA917 Specification for Steel Sheet,Coated by the Electro-lytic Process for Applications Requiring Designation ofthe Coating Mass on Each Surface(General Require-ments)A1008/A1008M Specification for Steel,Sheet,Cold-Rolled,Carbon,Structural,High-Strength Low-Alloy,High-Strength Low-Alloy with Improved Formability,SolutionHardened,and Bake HardenableA1011/A1011M Specification for Steel,Sheet and Strip,Hot-Rolled,Carbon,Structural,High-Strength Low-Alloy,High-StrengthLow-AlloywithImprovedFormability,and Ultra-High StrengthB504 Test Method for Measurement of Thickness of Metal-lic Coatings by the Coulometric Method3.Classification3.1 Coating shall be designated in accordance with Speci-fication A917.The letter G shall be used to designate SI unitsof pure zinc coatings.The letter Z shall be used to designateinch-pound units of pure zinc coating.4.Ordering Information4.1 Orders for products to this specification shall include thefollowing information,as necessary to adequately describe thedesired product:4.1.1 Name of product(electrolytic zinc-coated steel sheet).4.1.2 ASTM designation and year of issue.4.1.3 Base metal type(hot rolled or cold rolled).4.1.4 Base metal designation(Commercial Steel(CS),Drawing Steel(DS),Deep Drawing Steel(DDS),Extra Deep1This specification is under the jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and Steel Products and is the direct responsibility of Subcom-mittee A05.11 on Sheet Specifications.Current edition approved Feb.1,2017.Published February 2017.Originallyapproved in 1987.Last previous edition approved in 2012 as A879/A879M-12.DOI:10.1520/A0879_A0879M-12R17.2For 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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 Drawing Steel(EDDS),Structural Steel(SS),High-StrengthL