ASTM A1063/A1063M-09

    Standard Specification for Steel Sheet, Twin-Roll Cast, Zinc-Coated (Galvanized) by the Hot-Dip Process

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    1. Scope

    1.1 This specification covers steel sheet, produced by the Twin-Roll Cast Process (see Appendix X2) and zinc-coated (galvanized) by the hot-dip process in coils and cut lengths.

    Note 1—See Appendix X2 for a description of the Twin-Roll Cast process.

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

    1.3 Product furnished under this specification shall conform to the applicable requirements of the latest issue of Specification A 924/A 924M unless otherwise provided herein.

    1.4 The product is available in a number of designations, grades and classes and in the two following 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.

    1.5 This material is available in the following sizes:

    1.5.1 Thicknessup to 0.078 in. [2.0 mm]

    1.5.2 Widthup to 79 in. [2000 mm]

    1.6 This specification is applicable to orders in either inch-pound units (as A 1063) or SI units (as A 1063M). 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.

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

    1.8 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.

    1.9 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 8.1.2 to obtain the approximate coating thickness from the coating weight [mass].

    Minimum Requirement
    Triple-Spot Test
    Single-Spot Test
    Inch-Pound Units
    TypeCoating DesignationTotal Both Sides, oz/ft2
    One Side, oz/ft2
    Total Both Sides, oz/ft2
    ZincG01C 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
    SI Units
    TypeCoating Designation
    Total Both Sides, g/m2
    One Side, g/m2
    Total Both Sides, g/m2
    ZincZ001C 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

    A The coating designation number is the term by which this product is specified. Because of the many variables and changing conditions that are characteristic of continuous hot-dip coating lines, the zinc 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 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 A 1063/A 1063M requirements should also specify the particular coating designation.

    C 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


    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/A1063_A1063M-09

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