ASTM_A_1072_-_A_1072M_-_11_2015.pdf

Designation:A1072/A1072M11(Reapproved 2015)Standard Specification forZinc-5%Aluminum(Hot-Dip)Coatings on Iron and SteelProducts1This standard is issued under the fixed designation A1072/A1072M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers the requirements for zinc-5%aluminum coated,by the hot-dip process on iron and steelproducts.The coating may also contain small amounts ofelements other than zinc and aluminum that are intended toimprove processing and the characteristics of the coatedproduct.These metallic coatings include zinc-5%-aluminum(Zn-5Al),zinc-5%-aluminum-mischmetal(Zn-5Al-MM)andzinc-5%-aluminum-magnesium(Zn-%Al-Mg).1.2 This specification covers both un-fabricated productsand fabricated products,for example,assembled steel products,structural steel fabrications,large tubes already bent or weldedbefore hot-dip coating,and wire work fabricated from un-coated steel wire.This specification,also,covers steel forgingsand iron castings incorporated into pieces fabricated,beforehot-dip coating or which are too large to be centrifuged(orotherwise handled to remove excess molten bath metal).1.3 Fabricated reinforcing steel bar assemblies are coveredby the present specification.1.4 This specification is applicable to orders in eitherinch-pound units(as A1072)or SI units(as A1072M).Inch-pound units and SI units are not necessarily exact equivalents.Within the text of this specification and where appropriate,SIunits are shown in parentheses.Each system shall be usedindependently of the other without combining values in anyway.In the case of orders in SI units,all testing and inspectionshall be done using the metric equivalent of the test orinspection method as appropriate.In the case of orders in SIunits,such shall be stated to the hot-dip coater when the orderis placed.2.Referenced Documents2.1 ASTM Standards:2A47/A47M Specification for Ferritic Malleable Iron Cast-ingsA90/A90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA143/A143M Practice for Safeguarding Against Embrittle-ment of Hot-Dip Galvanized Structural Steel Products andProcedure for Detecting EmbrittlementA384/A384M Practice for Safeguarding Against Warpageand Distortion During Hot-Dip Galvanizing of SteelAssembliesA385 Practice for Providing High-Quality Zinc Coatings(Hot-Dip)A780 Practice for Repair of Damaged and Uncoated Areasof Hot-Dip Galvanized CoatingsA902 Terminology Relating to Metallic Coated Steel Prod-uctsB487 Test Method for Measurement of Metal and OxideCoating Thickness by Microscopical Examination ofCross SectionB602 Test Method for Attribute Sampling of Metallic andInorganic CoatingsB750 Specification for GALFAN(Zinc-5%Aluminum-Mischmetal)Alloy in Ingot Form for Hot-Dip CoatingsE376 Practice for Measuring Coating Thickness byMagnetic-Field or Eddy-Current(Electromagnetic)Test-ing Methods3.Terminology3.1 DefinitionsThe following terms and definitions arespecific to this specification.Terminology A902 contains otherterms and definitions relating to metallic-coated steel products.1This specification is under the jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and Steel Products and is the direct responsibility ofSubcommittee A05.13 on Structural Shapes and Hardware Specifications.Current edition approved Oct.1,2015.Published October 2015.Originallyapproved in 2011.Last previous edition approved in 2011 as A1072/A1072M-11.DOI:10.1520/A1072_A1072M-11R15.2For 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 3.2 Definitions of Terms Specific to This Standard:3.2.1 average coating thickness,nthe average of threespecimen coating thicknesses.3.2.2 black,adjdenotes the condition of not galvanized orotherwise coated.For purposes of this specification the word“black”does not refer to the color or condition of surface,or toa surface deposit or contamination.3.2.3 coating thickness grade,nthe numerical value fromTable 1 at the intersection of a material category and athickness range.3.2.4 gross dross inclusions,nthe iron/aluminum interme-tallics present in a galvanized coating in a form other thanfinely dispersed pimples.3.2.4.1 DiscussionThese inclusions would create an ex-posed steel spot if they were removed from the coating.Theseinclusions are raised surfaces and are easily knocked offthrough contact with lifting straps or chains,tools,fixtures,orother galvanized parts.3.2.5 material category,nthe general class or t