ASTM B860-08

    Standard Specification for Zinc Master Alloys for Use in Hot Dip Galvanizing

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    1. Scope

    1.1 This specification covers zinc master alloys which are used in hot dip galvanizing for the purpose of adjusting the concentration of certain alloying elements in the molten zinc bath. Table 1 covers the chemical composition of these materials which include six master alloys of zinc-aluminum (brightener) and one master alloy of zinc-antimony.

    ASTM Common UNS
    Type A-190/10 Zn/Al High PurityZ30750
    Type A-290/10 Zn/Al Low PurityZ31710
    Type A-395/5 Zn/Al High PurityZ30503
    Type A-495/5 Zn/Al Low PurityZ31510
    Type A-596/4 Zn/Al High Purity...
    Type A-696/4 Zn/AlLow Purity...
    Type S-190/10 Zn/Sb Z55710

    1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

    1.3 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 become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.

    TABLE 1 Chemical Requirements Composition, % (Range or Maximum Value)A

    Type A-190 % Zinc10 % Aluminum (90/10 Zn/Al)High Purity
    Type A-290 % Zinc10 % Aluminum (90/10 Zn/Al)Low Purity
    Type A-395 % Zinc5 % Aluminum (95/5 Zn/Al)High Purity
    Type A-495 % Zinc5 % Aluminum (95/5 Zn/Al)Low Purity
    Type A-596 % Zinc4 % Aluminum (96/4 Zn/Al)High Purity
    Type A-696 % Zinc4 % Aluminum (96/4 Zn/Al)Low Purity
    Type S-190 % Zinc10 % Antimony (90/10 Zn/Sb)
    UNSBType A-1
    90/10 Zn/Al
    Z30750
    Type A-2
    90/10 Zn/Al
    Z31710
    Type A-3
    95/5 Zn/Al
    Z30503
    Type A-4
    95/5 Zn/Al
    Z31510
    Type A-5
    96/4 Zn/Al
    ZXXXXX
    Type A-6
    96/4 Zn/Al
    ZXXXXX
    Type S-1
    90/10 Zn/Sb
    Z55710
    Fe0.05 max0.15 max0.05 max0.15 max0.05 max0.15 max0.03 max
    Pb0.005 max0.4 max0.005 max0.4 max0.0005 max0.4 max0.015 max
    Cd0.004 max...0.004 max...0.004 max...0.003 max
    Cu0.035 max0.5 max0.035 max0.5 max0.035 max0.5 max0.003 max
    Mg............0.06 max0.06 max
    Sn0.003 max...0.003 max...0.003 max...0.01 max
    As..................0.015 max
    Al9.510.59.510.54.55.54.55.54.0-4.54.0-4.5...
    SbC..................9.510.5
    Others, Total0.01 max0.25 max0.01 max0.25 max0.01 max0.25 max0.03 max
    ZnDRemainderRemainderRemainderRemainderRemainderRemainderRemainder

    A The following applies to all specified limits in this table: For purposes of determining conformance with this specification, an observed value obtained from analysis shall be rounded off to the nearest unit in the last right-hand place of figures used in expressing the limiting value, in accordance with the rounding method of Practice E 29.

    B UNS numbers in conformance with Practice E 527.

    C Chemical method under development.

    D For information only. Quantitative determination of this element is not required. Zinc is assumed to be the difference between 100 % and the sum of those elements listed above.


    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

    B897 Specification for Configuration of Zinc and Zinc Alloy Jumbo Block and Half Block Ingot

    B899 Terminology Relating to Non-ferrous Metals and Alloys

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    E88 Practice for Sampling Nonferrous Metals and Alloys in Cast Form for Determination of Chemical Composition

    E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)

    E536 Test Methods for Chemical Analysis of Zinc and Zinc Alloys

    ISO Standards

    ISO 3815-1 Zinc and zinc alloys -- Part 1: Analysis of solid samples by optical emission spectrometry

    ISO 3815-2 Zinc and zinc alloys -- Part 2: Analysis by inductively coupled plasma optical emission spectrometry


    UNSPSC Code

    UNSPSC Code 11101719(Zinc)


    DOI: 10.1520/B0860-08

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