ASTM B750-22

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

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.
SCOPE
1.1 This specification covers GALFAN, zinc-5 % aluminum-mischmetal (Zn-5Al-MM) alloy (UNS Z38510)3 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 Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-Mar-2022
• ICS: 77.120.60 - Lead, zinc, tin and their alloys
• Technical Committee: B02 - Nonferrous Metals and Alloys
• Drafting Committee: B02.04 - Zinc and Cadmium

Relations

• Refers: ASTM B899-16 - Standard Terminology Relating to Non-ferrous Metals and Alloys
• Effective Date: 01-Oct-2016
• Refers: ASTM B899-15 - Standard Terminology Relating to Non-ferrous Metals and Alloys
• Effective Date: 01-Oct-2015
• Refers: ASTM B899-14 - Standard Terminology Relating to Non-ferrous Metals and Alloys
• Effective Date: 01-Oct-2014
• Refers: ASTM B949-13 - Standard Specification for General Requirements for Zinc and Zinc Alloy Products
• Effective Date: 01-Aug-2013
• Refers: ASTM B899-13 - Standard Terminology Relating to Non-ferrous Metals and Alloys
• Effective Date: 01-Feb-2013
• Refers: ASTM B899-09 - Standard Terminology Relating to Non-ferrous Metals and Alloys
• Effective Date: 01-Oct-2009
• Refers: ASTM B899-09e1 - Standard Terminology Relating to Non-ferrous Metals and Alloys
• Effective Date: 01-Oct-2009
• Refers: ASTM E29-08 - Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
• Effective Date: 01-Oct-2008
• Refers: ASTM B949-08 - Standard Specification for General Requirements for Zinc and Zinc Alloy Products
• Effective Date: 15-May-2008
• Refers: ASTM E1277-08 - Standard Test Method for Chemical Analysis of Zinc-5 % Aluminum-Mischmetal Alloys by ICP Emission Spectrometry
• Effective Date: 01-Mar-2008
• Refers: ASTM B949-06 - Standard Specification for General Requirements for Zinc and Zinc Alloy Products
• Effective Date: 01-Dec-2006
• Refers: ASTM B899-06 - Standard Terminology Relating to Non-ferrous Metals and Alloys
• Effective Date: 01-Dec-2006
• Refers: ASTM E29-06b - Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
• Effective Date: 15-Nov-2006
• Refers: ASTM E29-06a - Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
• Effective Date: 15-Sep-2006
• Refers: ASTM E29-06 - Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
• Effective Date: 01-May-2006

Overview

ASTM B750-22 is the internationally recognized standard specification for GALFAN (Zinc-5% Aluminum-Mischmetal) Alloy in Ingot Form for Hot-Dip Coatings. Established by ASTM International, this standard outlines the requirements for supplying GALFAN alloy ingots (UNS Z38510) intended for remelting and use in the production of hot-dip protective coatings on steel products. GALFAN alloys, characterized by a controlled composition of zinc, aluminum, and mischmetal (a mixture mainly of cerium and lanthanum), offer enhanced corrosion resistance for coated steel applications. ASTM B750-22 ensures quality, consistency, and safety for manufacturers and end-users in the hot-dip galvanizing industry.

Key Topics

• Alloy Composition Requirements:
  The standard specifies allowable chemical composition ranges for key elements:

  • Aluminum: 4.2 to 6.2%
  • Cerium and Lanthanum (combined): 0.03 to 0.10%
  • Iron, Silicon, Lead, Cadmium, Tin, and other elements: strict maximum limits set to prevent contamination and intergranular corrosion
  • Zinc makes up the remainder of the alloy

• Quality and Purity:
  All ingots must be free from dross, slag, or any other harmful contamination to ensure high-quality hot-dip coatings.

• Material Production and Testing:
  The alloy can be manufactured by any approved process, with chemical conformity proven through standard analytical techniques, notably:

  • Inductively Coupled Plasma (ICP) argon plasma spectrometry
  • X-ray fluorescence for determining rare-earth components
  • Sampling methods as specified to ensure representative analysis

• Ordering and Certification:
  Purchasers must follow the ordering guidelines set out in ASTM B949, ensuring that all specifications are clearly defined and the supplied material meets standard requirements. Provisions for certification, inspection, rejection, and rehearing are referenced for compliance and quality assurance.

Applications

• Hot-Dip Galvanizing Industry:
  GALFAN alloy ingots conforming to ASTM B750-22 are primarily remelted to produce molten baths for hot-dip coating of steel. This process imparts a tightly adherent, highly corrosion-resistant metallic layer, extending steel's service life in harsh environments.

• Construction and Infrastructure:
  Hot-dip GALFAN-coated steel is widely used in construction, infrastructure, and utility sectors, including guardrails, structural steelwork, wire products, fencing, and fasteners, where enhanced durability and minimized maintenance are critical.

• Automotive and Energy Sectors:
  The advanced protection offered by GALFAN-coated steels also benefits automobile parts, power transmission lines, and renewable energy installations.

• Global Manufacturing Standards:
  Adoption of ASTM B750-22 ensures compatibility and quality for international trade and manufacturing, as it aligns with globally recognized testing and product conformity protocols.

Related Standards

• ASTM B899: Terminology Relating to Non-ferrous Metals and Alloys
• ASTM B949: General Requirements for Zinc and Zinc Alloy Products
• ASTM E1277: Analysis of Zinc-5% Aluminum-Mischmetal Alloys by ICP Emission Spectrometry
• ISO 3815-1 & ISO 3815-2: International standards for analysis of zinc and zinc alloys
• GF-1: Practice for Determination of Cerium and Lanthanum in GALFAN Alloy

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Keywords: ASTM B750, GALFAN, zinc-5% aluminum alloy, mischmetal, hot-dip coating, protective coatings, steel corrosion resistance, zinc alloy ingot, international standard, ASTM hot-dip galvanizing.

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:B750 −22
Standard Specification for
GALFAN (Zinc-5% Aluminum-Mischmetal) Alloy in Ingot
1,2
Form for Hot-Dip Coatings
This standard is issued under the fixed designation B750; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* E29 Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications
1.1 This specification covers GALFAN, zinc-5 %
3 E527 Practice for Numbering Metals and Alloys in the
aluminum-mischmetal (Zn-5Al-MM) alloy (UNS Z38510) in
Unified Numbering System (UNS)
ingot form for remelting for use in the production of hot-dip
E1277 Test Method for Analysis of Zinc-5 % Aluminum-
coatings on steel. Alloy composition is specified in Table 1.
Mischmetal Alloys by ICP Emission Spectrometry
1.2 The values stated in inch-pound units are to be regarded
2.2 Other Standard:
as standard. The values given in parentheses are mathematical
GF-1 Standard Practice for Determination of Cerium and
conversions to SI units that are provided for information only
Lanthanum Compositions in GALFAN Alloy (5 %
and are not considered standard.
-0.04 % La-0.04 % Ce-Bal SHG Zn)
1.3 This standard does not purport to address all of the
2.3 ISO Standards:
safety concerns, if any, associated with its use. It is the
ISO 3815-1 Zinc and zinc alloys — Part 1:Analysis of solid
responsibility of the user of this standard to become familiar
samples by optical emission spectrometry
with all hazards including those identified in the appropriate
ISO 3815-2 Zinc and zinc alloys — Part 2: Analysis by
Safety Data Sheet (SDS) for this product/material as provided
inductively coupled plasma optical emission spectrometry
by the manufacturer, to establish appropriate safety, health,
and environmental practices, and determine the applicability
3. Terminology
of regulatory limitations prior to use.
3.1 Terms shall be defined in accordance with Terminology
1.4 This international standard was developed in accor-
B899.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
3.2 Definitions of Terms Specific to This Standard:
Development of International Standards, Guides and Recom-
3.2.1 mischmetal, n—a naturally occurring mixture of rare-
mendations issued by the World Trade Organization Technical
earth elements in metallic form, primarily cerium and lantha-
Barriers to Trade (TBT) Committee.
num.
3.3 Abbreviations:
2. Referenced Documents
3.3.1 MM—mischmetal.
2.1 ASTM Standards:
3.3.2 Zn-5Al-MM—zinc-5 % aluminum mischmetal.
B899 Terminology Relating to Non-ferrous Metals and Al-
loys
4. Ordering Information
B949 Specification for General Requirements for Zinc and
4.1 Orders for ingot under this specification shall include
Zinc Alloy Products
the relevant information as listed in Specification B949.
5. Materials and Manufacture
This specification is under the jurisdiction of ASTM Committee B02 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
5.1 The alloys may be made by any approved process.
B02.04 on Zinc and Cadmium.
Current edition approved April 1, 2022. Published May 2022. Originally 5.2 See appropriate requirements in Specification B949.
approved in 1985. Last previous edition approved in 2016 as B750 – 16. DOI:
10.1520/B0750-22.
GALFAN is a registered trademark of the GALFAN Information Center, Inc.
3 5
UNS number in conformance with Practice E527. Available from International Lead Zinc Research Organization, 2525 Meridian
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Parkway, P.O. Box 12036, Research Triangle Park, NC 27709 – 2036, http://
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM www.ilzro.org.
Standards volume information, refer to the standard’s Document Summary page on Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B750−22
TABLE 1 GALFAN, Zn-5Al-MM Alloy Ingot Chemical
8. Analytical Methods
A,B,C,D,E
Requirements
8.1 Method of Analysis—The determination of chemical
UNS Z38510
Element
composition shall be made in accordance with ICP argon
Composition,%
F
plasma spectrometric (Test Method E1277) or other methods
Aluminum 4.2–6.2
Cerium + lanthanum, total 0.03–0.10
(including spectrochemical methods I
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B750 − 16 B750 − 22
Standard Specification for
GALFAN (Zinc-5 % Aluminum-Mischmetal) Alloy in Ingot
1,2,
Form for Hot-Dip Coatings
This standard is issued under the fixed designation B750; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
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 Safety Data Sheet
(SDS) for this product/material as provided by the manufacturer, to establish appropriate safety safety, health, and healthenvi-
ronmental practices, and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 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 Analysis of Zinc-5 % Aluminum-Mischmetal Alloys by ICP Emission Spectrometry
2.2 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)
This specification is under the jurisdiction of ASTM Committee B02 on Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee B02.04 on Zinc
and Cadmium.
Current edition approved May 1, 2016April 1, 2022. Published July 2016May 2022. Originally approved in 1985. Last previous edition approved in 20122016 as
B750 – 12.B750 – 16. DOI: 10.1520/B0750-16.10.1520/B0750-22.
GALFAN is a registered trademark of the GALFAN Information Center, Inc.
UNS number in conformance with Practice E527.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Available from International Lead Zinc Research Organization, 2525 Meridian Parkway, P.O. Box 12036, Research Triangle Park, NC 27709 – 2036, http://
www.ilzro.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B750 − 22
TABLE 1 GALFAN, Zn-5Al-MM Alloy Ingot Chemical
A,B,C,D,E
Requirements
UNS Z38510
Element
Composition,%
F
Aluminum 4.2–6.2
Cerium + lanthanum, total 0.03–0.10
Iron, max 0.075
Silicon, max 0.015
G
Lead , max 0.005
G
Cadmium , max 0.005
G
Tin , max 0.002
H
Others , each, max 0.02
H
Others , 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 detrimental effects on alloy performance 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 % maximu
...