1、Designation:A153/A153M16aAmerican Association State Highwayand Transportation Officials StandardAASHTO No.M232Standard Specification forZinc Coating(Hot-Dip)on Iron and Steel Hardware1This standard is issued under the fixed designation A153/A153M;the number immediately following the designation indi
2、cates 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.This standard has been approved for use by agencies of the
3、U.S.Department of Defense.1.Scope*1.1 This specification covers zinc coatings applied by thehot-dip process on iron and steel hardware.The hot-dipgalvanizing process consists of parts being immersed in moltenzinc for a sufficient time to allow a metallurgical reactionbetween iron from the steel surf
4、ace and the molten zinc,resulting in the formation of Zn/Fe alloy layers bonding thecoating to the steel surface.1.2 This specification is intended to be applicable to hard-ware items that are centrifuged or otherwise handled to removeexcess galvanizing bath metal(free zinc).Coating thicknessgrade r
5、equirements reflect this.1.3 Fasteners that must comply with the Fastener QualityAct require specific statistical sampling during the inspectionof the fastener lots.Requirements for the sampling of thesefasteners can be found in F2329/F2329M.1.4 This specification is applicable to orders in eitherin
6、ch-pound units(as A153)or in SI units(as A153M).Inch-pound units and SI units are not necessarily exactequivalents.Within the text of this specification and whereappropriate,SI units are shown in brackets.Each system shallbe used independently of the other without combining values inany way.In the c
7、ase of orders in SI units,all testing andinspection shall be done using the metric equivalent of the testor inspection method as appropriate.In the case of orders in SIunits,such shall be stated to the galvanizer when the order isplaced.1.5 This standard does not purport to address all of thesafety
8、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
9、 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 EmbrittlementA780 Practice for Repair of Damaged and Uncoated Areasof Hot-Dip Galvanized CoatingsA
10、902 Terminology Relating to Metallic Coated Steel Prod-uctsB6 Specification for ZincB487 Test Method for Measurement of Metal and OxideCoating Thickness by Microscopical Examination ofCross SectionB960 Specification for Prime Western Grade-Recycled(PWG-R)ZincE376 Practice for Measuring Coating Thick
11、ness byMagnetic-Field or Eddy-Current(Electromagnetic)Test-ing MethodsF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance InspectionF1789 Terminology for F16 Mechanical FastenersF2329/F2329M Specification for Zinc Coating,Hot-Dip,Requirements for Application to
12、Carbon and Alloy SteelBolts,Screws,Washers,Nuts,and Special ThreadedFasteners3.Terminology3.1 Definitions:3.1.1 The following terms and definitions are specific to thisspecification.Terminology A902 contains other terms anddefinitions relating to metallic-coated steel products.Terminol-ogy F1789 con
13、tains other terms and definitions relating tomechanical fasteners.3.2 Definitions of Terms Specific to This Standard: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 Shap
14、es and Hardware Specifications.Current edition approved.Published November 2016.Originally approved in1933.Last previous edition approved in 2016 as A153/A153M-16.DOI:10.1520/A0153_A0153M-16A.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at servic
15、eastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*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
16、 3.2.1 average coating thickness,nthe average of thespecimen coating thickness values for the samples in aninspection lot.3.2.2 bare spots,nuncoated areas on the surface of thesteel part that contain no measurable zinc coating.3.2.3 dross inclusions,nthe iron/zinc intermetallics pres-ent in a galvanized coating in a form other than the layergrowth of the coating.3.2.4 individual measurement,nthe reading from a mag-netic thickness gauge of a single coating spot thickness,or themicroscopic reading
