ASTM B860 - 13

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

    Active Standard ASTM B860 | Developed by Subcommittee: B02.04

    Book of Standards Volume: 02.04


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    Abstract

    This specification covers electrical contact components made from copper tungsten by powder metallurgical procedures. The material shall conform to the chemical composition limits as agreed upon between the manufacturer and the user. Qualification tests for determination of physical properties shall be performed on production parts, wherever practical or applicable. The tests shall be determined after consideration of the function of the part.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. The paper presented the chemical composition of these materials which include six master alloys of zinc aluminium; Type A-1, Type A-2, Type A-3, Type A-4, Type A-5, Type A-6, and one master alloy of zinc-antimony, Type S-1. The material covered by this specification shall be made of uniform quality and shall be free from harmful contamination. The alloys shall be tested and conform to the required chemical composition requirements.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    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-1

    90/10 Zn/Al

    High Purity

    Z30750

     

    Type A-2

    90/10 Zn/Al

    Low Purity

    Z31710

     

    Type A-3

    95/5  Zn/Al

    High Purity

    Z30503

     

    Type A-4

    95/5  Zn/Al

    Low Purity

    Z31510

     

    Type A-5

    96/4  Zn/Al

    High Purity

    Z31520

     

    Type A-6

    96/4  Zn/Al

    Low Purity

    Z30504

     

    Type S-1

    90/10 Zn/Sb

     

    Z55710


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

    Type A-1

    90 % Zinc–10 % Aluminum (90/10 Zn/Al)

    High Purity

    Type A-2

    90 % Zinc–10 % Aluminum (90/10 Zn/Al)

    Low Purity

    Type A-3

    95 % Zinc–5 % Aluminum (95/5 Zn/Al)

    High Purity

    Type A-4

    95 % Zinc–5 % Aluminum (95/5 Zn/Al)

    Low Purity

    Type A-5

    96 % Zinc–4 % Aluminum (96/4 Zn/Al)

    High Purity

    Type A-6

    96 % Zinc–4 % Aluminum (96/4 Zn/Al)

    Low Purity

    Type S-1

    90 % Zinc–10 % Antimony (90/10 Zn/Sb)

     

    UNSB

    Type 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
    Z31520

    Type A-6
    96/4 Zn/Al
    Z30504

    Type S-1
    90/10 Zn/Sb
      Z55710

    Fe

    0.05 max

    0.15 max

    0.05 max

    0.15 max

    0.05 max

    0.15 max

    0.03 max

    Pb

    0.005 max

    0.4 max

    0.005 max

    0.4 max

    0.005 max†

    0.4 max

    0.015 max

    Cd

    0.004 max

    ...

    0.004 max

    ...

    0.004 max

    ...

    0.003 max

    Cu

    0.035 max

    0.5 max

    0.035 max

    0.5 max

    0.035 max

    0.5 max

    0.003 max

    Mg

    ...

    ...

    ...

    ...

    0.06 max

    0.06 max

     

    Sn

    0.003 max

    ...

    0.003 max

    ...

    0.003 max

    ...

    0.01 max

    As

    ...

    ...

    ...

    ...

    ...

    ...

    0.015 max

    Al

    9.5–10.5

    9.5–10.5

    4.5–5.5

    4.5–5.5

    4.0-4.5

    4.0-4.5

    ...

    SbC

    ...

    ...

    ...

    ...

    ...

    ...

    9.5–10.5

    Others, Total

    0.01 max

    0.25 max

    0.01 max

    0.25 max

    0.01 max

    0.25 max

    0.03 max

    ZnD

    Remainder

    Remainder

    Remainder

    Remainder

    Remainder

    Remainder

    Remainder

    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 E29.
    B UNS numbers in conformance with Practice E527.
    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.
    † Corrected editorially.

    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.


    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


    ICS Code

    ICS Number Code 77.120.60 (Lead, zinc, tin and their alloys)

    UNSPSC Code

    UNSPSC Code 11101719(Zinc)


    DOI: 10.1520/B0860-13

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