ASTM_A_875_-_A_875M_-_13.pdf

Designation:A875/A875M13Standard Specification forSteel Sheet,Zinc-5%Aluminum Alloy-Coated by the Hot-DipProcess1This standard is issued under the fixed designation A875/A875M;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.Scope*1.1 This specification covers steel sheet,in coils and cutlengths,metallic-coated by the hot-dip process,with zinc-5%aluminum alloy coating.The Zn-5Al alloy coating also con-tains small amounts of elements other than zinc and aluminumthat are intended to improve processing and the characteristicsof the coated product.1.2 The coating is produced as two types:zinc-5%aluminum-mischmetal alloy(Type I)and zinc-5%aluminum-0.1%magnesium alloy(Type II),and in two coating structures(classes).The coated sheet is produced in several coatingdesignations(coating weight mass).1.3 The material is intended for applications requiringcorrosion resistance,formability,and paintability.1.4 The steel sheet is produced in a number of designations,types,grades,and classes designed to be compatible withdiffering application requirements.1.5 Coated sheet material furnished under this specificationshall conform to the applicable requirements of the latest issueof Specification A924/A924M,unless otherwise providedherein.1.6 The text of this specification references notes andfootnotes that provide explanatory material.These notes andfootnotes,excluding tables and figures,shall not be consideredas requirements of this specification.1.7 This specification is applicable to orders in eitherinch-pound units(as A875)or metric(SI)units as A875M.Values in inch-pound and SI units are to be regarded separatelyas standard.Within the text,the SI units are shown in brackets.The values stated in each system are not exact equivalents.Therefore,each system shall be used independently of theother.1.8 Unless the order specifies the“M”specification desig-nation(SI units),the material shall be furnished to inch-poundunits.1.9 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2A90/A90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA902 Terminology Relating to Metallic Coated Steel Prod-uctsA924/A924M Specification for General Requirements forSteel Sheet,Metallic-Coated by the Hot-Dip ProcessB750 Specification for GALFAN(Zinc-5%Aluminum-Mischmetal)Alloy in Ingot Form for Hot-Dip CoatingsE47 Test Methods for Chemical Analysis of Zinc Die-Casting Alloys(Withdrawn 1997)3E517 Test Method for Plastic Strain Ratio r for Sheet MetalE646 Test Method for Tensile Strain-Hardening Exponents(n-Values)of Metallic Sheet MaterialsE1277 Test Method for Chemical Analysis of Zinc-5%Aluminum-Mischmetal Alloys by ICP Emission Spec-trometry2.2 ISO Standard:4ISO 14788 Continuous Hot-Dip Zinc-5%Aluminum AlloyCoated Steel Sheet and Coils2.3 Other Document:5GF-1 Standard Practice for Determination of Cerium andLanthanum Compositions in Galfan Alloy(5%Al-0.4%1This specification is under the jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and Steel Products and is the direct responsibility ofSubcommittee A05.11 on Sheet Specifications.Current edition approved April 1,2013.Published April 2013.Originallyapproved in 1987.Last previous edition approved in 2010 as A875/A875M-10.DOI:10.1520/A0875_A0875M-13.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.5Available from International Lead Zinc Research Organization,Inc.,2525Meridian Parkway,P.O.Box 12036,Research Triangle Park,NC 27709-2036.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 La-0.4%Ce-Bal SHG ZN)3.Terminology3.1 DefinitionsSee Terminology A902 for definitions ofgeneral terminology relating to metallic-coated steel products.3.2 Definitions of Terms Specific to This Standard:3.2.1minimized coating structure,na coating character-ized by a finer metallurgical coating structure obtained by atreatment designed to restrict the formation of the normalcoarse grain structure formed during solidification of theZn-5A1 alloy coating.3.2.2