ASTM A653/A653M-11

    Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process

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    1. Scope

    1.1 This specification covers steel sheet, zinc-coated (galvanized) or zinc-iron alloy-coated (galvannealed) by the hot-dip process in coils and cut lengths.

    1.2 The product is produced in various zinc or zinc-iron alloy-coating weights [masses] or coating designations as shown in Table 1 and in Table S2.1.

    1.3 Product furnished under this specification shall conform to the applicable requirements of the latest issue of Specification A924/A924M, unless otherwise provided herein.

    1.4 The product is available in a number of designations, grades and classes in four general categories that are designed to be compatible with different application requirements.

    1.4.1 Steels with mandatory chemical requirements and typical mechanical properties.

    1.4.2 Steels with mandatory chemical requirements and mandatory mechanical properties.

    1.4.3 Steels with mandatory chemical requirements and mandatory mechanical properties that are achieved through solid-solution or bake hardening.

    1.5 This specification is applicable to orders in either inch-pound units (as A653) or SI units (as A653M). Values in inch-pound and SI units are not necessarily equivalent. Within the text, SI units are shown in brackets. Each system shall be used independently of the other.

    1.6 The text of this specification references notes and footnotes that provide explanatory material. These notes and footnotes, excluding those in tables and figures, shall not be considered as requirements of this specification.

    1.7 Unless the order specifies the M designation (SI units), the product shall be furnished to inch-pound units.

    1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

    TABLE 1 Weight [Mass] of Coating RequirementsA, B, C

    Note— Use the information provided in 8.1.3 to obtain the approximate coating thickness from the coating weight [mass].

    Minimum RequirementD
    Triple-Spot Test (TST)
    Single-Spot Test (SST)
    Inch-Pound Units
    TypeCoating DesignationTST
    Total Both Sides, oz/ft2
    TST
    One Side, oz/ft2
    SST
    Total Both Sides, oz/ft2
    ZincG01 no minimumno minimum no minimum
    G30 0.300.100.25
    G40 0.400.120.30
    G60 0.600.200.50
    G90 0.900.320.80
    G1001.000.360.90
    G1151.150.401.00
    G1401.400.481.20
    G1651.650.561.40
    G1851.850.641.60
    G2102.100.721.80
    G2352.350.802.00
    G3003.001.042.60
    G3603.601.283.20
    Zinc-iron alloyA01 no minimumno minimumno minimum
    A25 0.250.080.20
    A40 0.400.120.30
    A60 0.600.200.50
    SI Units
    TypeCoating Designation
    TST
    Total Both Sides, g/m2
    TST
    One Side, g/m2
    SST
    Total Both Sides, g/m2
    ZincZ001 no minimumno minimumno minimum
    Z90 90 30 75
    Z120 120 36 90
    Z180 180 60150
    Z275 275 94235
    Z305 305110275
    Z350 350120300
    Z450 450154385
    Z500 500170425
    Z550 550190475
    Z600 600204510
    Z700 700238595
    Z900 900316790
    Z11001100390975
    Zinc-iron alloyZF001no minimumno minimumno minimum
    ZF75 75 24 60
    ZF120120 36 90
    ZF180180 60150

    A The coating designation is the term by which the minimum triple spot, total both sides coating weight [mass] is specified. Because of the many variables and changing conditions that are characteristic of continuous 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 it always evenly distributed 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 requirement.

    B As 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. For example, heavier galvanized coatings perform adequately in bold atmospheric exposure whereas the lighter coatings are often further coated with paint or a similar barrier coating for increased corrosion resistance. Because of this relationship, products carrying the statement meets ASTM A653/A653Mrequirements should also specify the particular coating designation.

    C International Standard, ISO 3575, continuous hot-dip zinc-coated carbon steel sheet contains Z100 and Z200 designations and does not specify a ZF75 coating.

    D No minimum means that there are no established minimum requirements for triple- and single-spot tests.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    A90/A90M Test Method for Weight [Mass] of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy Coatings

    A370 Test Methods and Definitions for Mechanical Testing of Steel Products

    A568/A568M Specification for Steel, Sheet, Carbon, Structural, and High-Strength, Low-Alloy, Hot-Rolled and Cold-Rolled, General Requirements for

    A902 Terminology Relating to Metallic Coated Steel Products

    A924/A924M Specification for General Requirements for Steel Sheet, Metallic-Coated by the Hot-Dip Process

    D7396 Guide for Preparation of New, Continuous Zinc-Coated (Galvanized) Steel Surfaces for Painting

    E517 Test Method for Plastic Strain Ratio r for Sheet Metal

    E646 Test Method for Tensile Strain-Hardening Exponents (n -Values) of Metallic Sheet Materials

    ISO Standard

    ISO 3575 Continuous Hot-Dip Zinc-Coated Carbon Steel of Commercial and Drawing Qualities

    ISO 4998 Continuous Hot-Dip Zinc-Coated Carbon Steel of Structural Quality


    ICS Code

    ICS Number Code 77.140.50 (Flat steel products and semi-products)

    UNSPSC Code

    UNSPSC Code 30264000(Carbon steel sheets)


    DOI: 10.1520/A0653_A0653M-11

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