ASTM B750 - 12

    Standard Specification for GALFAN (Zinc-5 % Aluminum-Mischmetal) Alloy in Ingot Form for Hot-Dip Coatings

    Active Standard ASTM B750 | Developed by Subcommittee: B02.04

    Book of Standards Volume: 02.04


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    ASTM B750

    Abstract

    This specification covers GALFAN, zinc-aluminum-mischmetal (Zn-5Al-MM) alloy (UNS Z38510) in ingot form for remelting for use in the production of hot-dip coatings on steel. The alloys may be made by any approved process and shall be free from dross, slag, or other harmful contamination. The alloys shall conform to the requirements as to chemical composition prescribed for aluminum, cerium and lanthanum, iron, silicon, lead, cadmium, tin, zinc, and other elements. Sampling for chemical analysis of the alloy in standard ingot form shall be done either by drilling, sawing, or melting, and shall meet the requirements specified for selection of portion, sample preparation, and size of sample and storage. Determination of the chemical composition shall be performed by ICP argon plasma spectrometric or other methods. X-ray fluorescence spectrometry may be used for determination of cerium and lanthanum.

    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 GALFAN, zinc-5 % aluminum-mischmetal (Zn-5Al-MM) alloy (UNS Z38510) in ingot form for remelting for use in the production of hot-dip coatings on steel. Alloy composition is specified in Table 1.

    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 GALFAN, Zn-5Al-MM Alloy Ingot Chemical
    RequirementsA,B,C,D,E

    ElementUNS Z38510
    Composition,%
    AluminumF4.26.2
    Cerium + lanthanum, total 0.030.10
    Iron, max 0.075
    Silicon, max0.015
    LeadG, max 0.005
    CadmiumG, max 0.005
    TinG, max 0.002
    OthersH, each, max 0.02
    OthersH, total, max 0.04
    Zinc Remainder

    A For purposes of acceptance and rejection, the observed value or calculated value obtained from analysis should be rounded to the nearest unit in the last right-hand place of figures, used in expressing the specified limit, in accordance with the rounding procedure prescribed in Section 3 of Practice E29.

    B By agreement between purchaser and supplier, analysis may be required and limits established for elements or compounds not specified in the table of chemical composition.

    C GALFAN, Zn-5Al-MM alloy ingot for hot-dip coatings may contain antimony, copper, and magnesium in amounts of up to 0.002, 0.1, and 0.05 %, respectively. No harmful effects have ever been noted due to the presence of these elements up to these concentrations and, therefore, analyses are not required for these elements.

    D Magnesium may be specified by the buyer up to 0.1 % maximum.

    E Zirconium and titanium may each be specified by the buyer up to 0.02 % maximum.

    F Aluminum may be specified by the buyer up to 12 % maximum.

    G Lead and cadmium, and to a lesser extent tin and antimony, are known to cause intergranular corrosion in zinc-aluminum alloys. For this reason it is important to maintain the levels of these elements below the limits specified.

    H Except antimony, copper, magnesium, zirconium, and titanium.


    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

    B899 Terminology Relating to Non-ferrous Metals and Alloys

    B949 Specification for General Requirements for Zinc and Zinc Alloy Products

    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)

    E1277 Test Method for Chemical Analysis of Zinc-5 % Aluminum-Mischmetal Alloys by ICP Emission Spectrometry

    Other Standard

    GF-1 Standard Practice for Determination of Cerium and Lanthanum Compositions in GALFAN Alloy (5% -0.04% La-0.04% Ce-Bal SHG Zn)

    ISO Standards

    ISO3815-2 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


    DOI: 10.1520/B0750-12

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