ASTM B989-22

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Designation: B989 − 19a B989 − 22
Standard Specification for
High Fluidity (HF) Zinc-Aluminum Alloy in Ingot Form for
Thin Wall Die Castings
This standard is issued under the fixed designation B989; 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 a commercial zinc-aluminum alloy in ingot form for remelting for the manufacture of thin wall
pressure die castings as designated and specified in Table 1.
1.2 Systems of nomenclature used to designate zinc and zinc-aluminum (ZA) alloys used for casting are described in Appendix
X1.
1.3 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.
1.4 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.
1.5 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 ASTM Standards:
B897 Specification for Configuration of Zinc and Zinc Alloy Jumbo, Block, Half Block, and Slab Ingot
B899 Terminology Relating to Non-ferrous Metals and Alloys
B908 Practice for the Use of Color Codes for Zinc Casting Alloy Ingot
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
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
E536 Test Methods for Chemical Analysis of Zinc and Zinc Alloys
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 Nov. 1, 2019April 1, 2022. Published December 2019May 2022. Originally approved in 2014. Last previous edition approved in 2019 as
B989 – 19.B989 – 19a. DOI: 10.1520/B0989-19a.10.1520/B0989-22.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. 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
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B989 − 22
TABLE 1 Chemical and North American Color Code
Requirements
A,B,C
Common Name HF Alloy
UNS Z33511
D
Color Code Red/Brown
A,B,C
Element Composition %
Aluminum 4.4–4.7
Magnesium 0.007–0.012
Copper, max 0.035
Iron, max 0.03
Lead, max 0.003
Cadmium, max 0.002
Tin, max 0.001
E
Zinc Remainder
A
Zinc alloy ingots for die casting may contain nickel, chromium, silicon, and
manganese in amounts of up to 0.01, 0.01, 0.01, and 0.01 %, respectively. No
harmful effects deleterious effects on alloy performance have ever been noted due
to the presence of these elements in up to these concentrations and, therefore,
analyses are not required for these elements.
B
The last digit of a UNS number differentiates between alloys of similar
composition. UNS designations for ingot and casting versions of an alloy were not
assigned in the same sequence for alloys.
C
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 Practice E29.
D
Refer to Practice B908 (Note: Colors indicated are for North American
applications.)
E
Determined arithmetically by difference.
2.3 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
3. Terminology
3.1 Terms shall be defined in accordance with Terminology B899.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 die casting, n—a casting process in which molten metal is injected under high velocity and pressure into a metal die and
solidified, also a product produced by such a process; alternately known as pressure die casting.
3.2.2 high fluidity alloy, n—a zinc alloy by nature of its composition is capable of producing die castings with thinner wall sections
compared to typical die cast alloys; often less than 0.012 in. (0.30 mm) in thickness.
3.2.3 thin wall die casting, n—a die casting with wall sections that can be less than 0.012 in. (0.30 mm) in thickness.
4. Ordering Information
4.1 See Specification B949.
5. Chemical Requirements
5.1 The ingots shall conform to the requirements as to chemical composition as prescribed in Table 1. Conformance shall b
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