Standard Specification for Steel Sheet, Zinc-Coated ...

1 Designation: A 653/A 653M 05 Standard Specification forSteel sheet , Zinc-Coated (Galvanized) or zinc -Iron Alloy- coated (Galvannealed) by the Hot-Dip Process1 This Standard is issued under the fixed designation A 653/A 653M; 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 superscript epsilon (e) indicates an editorial change since the last revision or Scope* This specification covers Steel sheet , Zinc-Coated (gal-vanized) or zinc -iron alloy- coated (galvannealed) by the hot-dip process in coils and cut The product is produced in various zinc or zinc -ironalloy-coating weights [masses]

2 Or coating designations asshown inTable Product furnished under this specification shall conformto the applicable requirements of the latest issue of Specifica-tionA 924/A 924M, unless otherwise provided The product is available in a number of designations,grades and classes in four general categories that are designedto be compatible with different application Steels with mandatory chemical requirements andtypical mechanical Steels with mandatory chemical requirements andmandatory mechanical Steels with mandatory chemical requirements andmandatory mechanical properties that are achieved throughsolid-solution or bake This specification is applicable to orders in eitherinch-pound units (as A 653) or SI units (as A 653M).

3 Values ininch-pound and SI units are not necessarily equivalent. Withinthe text, SI units are shown in brackets. Each system shall beused independently of the Unless the order specifies the M designation (SIunits), the product shall be furnished to inch-pound The text of this specification references notes andfootnotes that provide explanatory material. These notes andfootnotes, excluding those in tables and figures, shall not beconsidered as requirements of 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 Referenced standards .

4 2A 90/A 90 MTest Method for Weight [Mass] of Coating onIron and Steel Articles with zinc or zinc -Alloy CoatingsA 370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA 568/A 568 MSpecification for Steel , sheet , Carbon, andHigh-Strength, Low-Alloy, Hot-Rolled and Cold-Rolled,General Requirements forA 902 Terminology Relating to Metallic coated Steel Prod-uctsA 924/A 924 MSpecification for General Requirements forSteel sheet , Metallic- coated by the Hot-Dip ProcessD 2092 Guide for Treatment of Zinc-Coated (Galvanized) Steel Surfaces for PaintingE 517 Test Method for Plastic Strain Ratiorfor sheet MetalE 646 Test Method for Tensile Strain-Hardening Exponents(nvalues) of Metallic sheet Standard :ISO 3575 Continuous Hot-Dip Zinc-Coated Carbon Steel ofCommercial and Drawing Qualities3 ISO 4998 Continuous Hot-Dip Zinc-Coated Carbon Steel ofStructural Quality33.

5 See TerminologyA 902for definitions ofgeneral terminology relating to metallic- coated hot-dip of Terms Specific to This hardenable Steel ,n Steel sheet in which asignificant increase in yield strength is realized when moderateheat treatment, such as that used for paint baking, followsstraining or cold specification is under the jurisdiction of ASTM Committee A05 onMetallic- coated Iron and Steel Products and is the direct responsibility ofSubcommittee on sheet edition approved June 1, 2005. Published June 2005. Originallyapproved in 1994. Last previous edition approved in 2004 as A 653/A 653M - referenced ASTM standards , visit the ASTM website, , orcontact ASTM Customer Service at ForAnnual Book of ASTMS tandardsvolume information, refer to the Standard s Document Summary page onthe ASTM from American National standards Institute (ANSI), 25 W.

6 43rd St.,4th Floor, New York, NY *A Summary of Changes section appears at the end of this ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United coated ,n galvanized Steel sheet havinga specified coating designation on one surface and a signifi-cantly lighter specified coating designation on the The single side relationship of eitherspecified coating designation is the same as shown in thenote ofTable 1regarding uniformity of strength low alloy Steel ,n a specific group ofsheet steels whose strength is achieved through the use ofmicroalloying elements such as columbium (niobium), vana-dium, titanium, and molybdenum resulting in improved form-ability and weldability than is obtained from conventionalcarbon-manganese Producers use one or a combination ofmicroalloying elements to achieve the desired properties.

7 Theproduct is available in two designations, HSLAS andHSLAS-F. Both products are strengthened with microalloys,but HSLAS-F is further treated to achieve inclusion spangle,n the finish produced on hot-dipzinc- coated Steel sheet in which the grain pattern is visible tothe unaided eye, and is typically smaller and less distinct thanthe pattern visible on regular This finish is produced by one of twomethods: either(1)the zinc crystal growth has been started butarrested by special production practices during solidification ofthe zinc , or(2)the zinc crystal growth is inhibited by acombination of coating-bath chemistry plus cooling duringsolidification of the zinc .

8 Minimized spangle is normallyproduced in coating designations G90 [Z275] and 1 Weight [Mass] of Coating RequirementsA,B,CNOTE1 Use the information provided obtain the approximate coating thickness from the coating weight [mass].Minimum RequirementDTriple-Spot TestSingle-Spot TestInch-Pound UnitsTypeCoating DesignationTotal Both Sides, oz/ft2 One SideTotal Both Sides, minimumno minimumno minimumZinc-iron minimumno minimumno minimumSI UnitsTypeCoating DesignationTotal Both Sides, g/m2 One SideTotal Both Sides, g/m2 ZincZ11001100390975Z900900316790Z7007002 38595Z600600204510Z550550190475Z50050017 0425Z450450154385Z350350120300Z275275942 35Z18018060150Z1201203690Z90903075Z001no minimumno minimumno minimumZinc-iron alloyZF18018060150ZF1201203690ZF75752460 ZF001no minimumno minimumno minimumAThe coating designation number is the term by which this product is specified.

9 Because of the many variables and changing conditions that are characteristic ofcontinuous hot-dip coating lines, the zinc or zinc -iron alloy coating is not always evenly divided between the two surfaces of a coated sheet ; nor is italways evenlydistributed from edge to edge. However, the minimum triple-spot average coating weight (mass) on any one side shall not be less than 40 % of the single-spot it is an established fact that the atmospheric corrosion resistance of zinc or zinc -iron alloy- coated sheet products is a direct function of coating thickness (weight(mass)), the selection of thinner (lighter) coating designations will result in almost linearly reduced corrosion performance of the coating.

10 For example, heavier galvanizedcoatings perform adequately in bold atmospheric exposure whereas the lighter coatings are often further coated with paint or a similar barrier coating for increasedcorrosion resistance. Because of this relationship, products carrying the statement meets ASTM A 653/A 653M requirements should also specify theparticular Standard , ISO 3575, continuous hot-dip Zinc-Coated carbon Steel sheet contains Z100 and Z200 designations and does not specify a minimum means that there are no established minimum requirements for triple- and single-spot 653/A 653M spangle,n the finish produced on hot-dipzinc- coated Steel sheet in which there is a visible multifacetedzinc crystal Solidification of the zinc coating istypically uncontrolled, which produces the variable grain sizeassociated with this.