ASTM B327-21

Standard Specification for Master Alloys Used in Making Zinc Die Casting Alloys

ABSTRACT
This specification covers aluminum-base and zinc-base master alloys used to make zinc die-casting alloys. The material may be made by any suitable process. The material covered by this specification shall be of uniform quality and shall be free of dross, flux, or other harmful contamination. If the material is in shot form, it shall be sound, uniform size, and free of a heavily oxidized surface coating, stringers, and moisture. Aluminum-base master alloys (hardeners) shall be tested and conform to the required chemical composition for aluminum, copper, iron, silicon, manganese, magnesium, zinc, chromium, nickel, tin, lead, and cadmium. Zinc-base master alloys shall conform to the color code requirements and to the required alloy composition for aluminum, magnesium, iron, copper, lead, cadmium, tin, and zinc. The weight of jumbo ingots shall conform to the required weight limits.
SCOPE
1.1 This specification covers aluminum-base and zinc-base master alloys used to make zinc die-casting alloys. Alloy compositions specified for aluminum-base master alloys (hardeners) are designated as shown in Table 1. Alloy compositions specified for the zinc-base master alloys are designated as shown in Table 2.    
1.2 Aluminum alloy hardeners are added to Special High Grade zinc (per Specification B6) in the proper alloying ratios, as shown in Table 1, to produce zinc alloys for die casting.  
1.3 Zinc-base master alloy is added to Special High Grade zinc (per Specification B6) in the proper alloying ratio, as shown in Table 3, to produce zinc alloy for die casting.  
1.4 Master alloys may be supplied in the form of shot, bar, ingot, or jumbo ingot as specified by the purchaser. Specification B897 covers configuration of jumbo, block, half block, and slab ingot.  
1.5 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.  
1.6 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.  
1.7 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-Oct-2021
• ICS: 77.120.10 - Aluminium and aluminium alloys
• Technical Committee: B02 - Nonferrous Metals and Alloys
• Drafting Committee: B02.04 - Zinc and Cadmium

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:B327 −21
Standard Specification for
1
Master Alloys Used in Making Zinc Die Casting Alloys
This standard is issued under the fixed designation B327; 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* 2. Referenced Documents
1.1 This specification covers aluminum-base and zinc-base
2.1 The following documents of the issue in effect on date
master alloys used to make zinc die-casting alloys. Alloy
of order acceptance form a part of this specification to the
compositions specified for aluminum-base master alloys (hard-
extent referenced herein:
eners) are designated as shown in Table 1.Alloy compositions
2
2.2 ASTM Standards:
specified for the zinc-base master alloys are designated as
B6 Specification for Zinc
shown in Table 2.
B275 PracticeforCodificationofCertainZinc,TinandLead
1.2 Aluminum alloy hardeners are added to Special High
3
Die Castings (Withdrawn 2020)
Grade zinc (per Specification B6) in the proper alloying ratios,
B897 Specification for Configuration of Zinc and ZincAlloy
as shown in Table 1, to produce zinc alloys for die casting.
Jumbo, Block, Half Block, and Slab Ingot
1.3 Zinc-base master alloy is added to Special High Grade
B899 Terminology Relating to Non-ferrous Metals and Al-
zinc (per Specification B6) in the proper alloying ratio, as
loys
shown in Table 3, to produce zinc alloy for die casting.
B908 Practice for the Use of Color Codes for Zinc Casting
1.4 Master alloys may be supplied in the form of shot, bar,
Alloy Ingot
ingot, or jumbo ingot as specified by the purchaser. Specifica-
B949 Specification for General Requirements for Zinc and
tion B897 covers configuration of jumbo, block, half block,
Zinc Alloy Products
and slab ingot.
E29 Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications
1.5 The values stated in inch-pound units are to be regarded
E34 Test Methods for Chemical Analysis of Aluminum and
as standard. The values given in parentheses are mathematical
3
conversions to SI units that are provided for information only Aluminum-Base Alloys (Withdrawn 2017)
E88 Practice for Sampling Nonferrous Metals and Alloys in
and are not considered standard.
Cast Form for Determination of Chemical Composition
1.6 This standard does not purport to address all of the
E527 Practice for Numbering Metals and Alloys in the
safety concerns, if any, associated with its use. It is the
Unified Numbering System (UNS)
responsibility of the user of this standard to become familiar
E536 Test Methods for Chemical Analysis of Zinc and Zinc
with all hazards including those identified in the appropriate
Alloys
Safety Data Sheet (SDS) for this product/material as provided
E1251 Test Method for Analysis of Aluminum and Alumi-
by the manufacturer, to establish appropriate safety, health,
and environmental practices, and determine the applicability num Alloys by Spark Atomic Emission Spectrometry
of regulatory limitations prior to use. 4
2.3 ISO Standards:
1.7 This international standard was developed in accor-
ISO 3815-1 Zinc and zinc alloys — Part 1:Analysis of solid
dance with internationally recognized principles on standard-
samples by optical emission spectrometry
ization established in the Decision on Principles for the
ISO 3815-2 Zinc and zinc alloys — Part 2: Analysis by
Development of International Standards, Guides and Recom-
inductively coupled plasma optical emission spectrometry
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
1
This specification is under the jurisdiction of ASTM Committee B02 on Standards volume information, refer to the standard’s Document Summary page on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee the ASTM website.
3
B02.04 on Zinc and Cadmium. The last approved version of this historical standard is referenced on
Current edition approved Nov. 1, 2021. Published December 2021. Originally www.astm.org.
4
approved in 1958. Last previous edition approved in 2016 as B327 – 16. DOI: Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
10.1520/B0327-21. 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
...

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: B327 − 16 B327 − 21
Standard Specification for
1
Master Alloys Used in Making Zinc Die Casting Alloys
This standard is issued under the fixed designation B327; 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 aluminum–basealuminum-base and zinc–basezinc-base master alloys used to make zinc die-casting
alloys. Alloy compositions specified for aluminum–basealuminum-base master alloys (hardeners) are designated as shown in Table
1. Alloy compositions specified for the zinc-base master alloys are designated as shown in Table 2.
1.2 Aluminum alloy hardeners are added to Special High Grade zinc (per Specification B6) in the proper alloying ratios, as shown
in Table 1, to produce zinc alloys for die casting.
1.3 Zinc-base master alloy is added to Special High Grade zinc (per Specification B6) in the proper alloying ratio, as shown in
Table 3, to produce zinc alloy for die casting.
1.4 Master alloys may be supplied in the form of shot, bar, ingot, or jumbo ingot as specified by the purchaser. Specification B897
covers configuration of jumbo, block, half block, and slab ingot.
1.5 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.
1.6 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.
1.7 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 The following documents of the issue in effect on date of order acceptance form a part of this specification to the extent
referenced herein:
2
2.2 ASTM Standards:
B6 Specification for Zinc
1
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, 2016Nov. 1, 2021. Published July 2016December 2021. Originally approved in 1958. Last previous edition approved in 20132016 as
B327B327 – 16. – 13a. DOI: 10.1520/B0327-16.10.1520/B0327-21.
2
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.
*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
1

---------------------- Page: 1 ----------------------
B327 − 21
TABLE 1 Chemical Requirements for Aluminum-Base Master Alloys
NOTE 1—The following applies to all specified limits in this table: For purposes of determining conformance with this specification, the observed value
or calculated value obtained from analysis shall be rounded off “to the nearest unit” in the last right hand place of figures used in expressing the specified
limit, in accordance with the rounding method of Practice E29.
Composition, percent
ASTM Alu- Manga- Chro- Cad-
Iron, Silicon, Nickel, Tin, Lead,
A
Alloy minum, Copper nese, Magnesium Zinc mium, mium, Usage
A
max max max max max
A
min max max max
B B
ZG71A 87.0 1.7 max 0.8 0.7 0.50 0.65–1.05 6.5–7.5 0.20 0.20 0.02 0.020 0.010 1 part by weight of ZG71A, 21
parts by weight of Special High
C
Grade zinc to make ASTM
B
zinc alloy Z33524 (AG40A )
A
Carried to one additional decimal place to ensure proper control in the final alloy.
B
ASTM alloy designations were established in accordance with Practice B275.
C
ASTM Specification B6, for Zinc.
A,B,C
TABLE 2 Chemical and Co
...