ASTM-B860 › Historical Revision Information
Standard Specification for Zinc Master Alloys for Use in Hot Dip Galvanizing
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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.
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 | ... | |
| Type A-6 | 96/4 Zn/Al | Low Purity | ... | |
| Type S-1 | 90/10 Zn/Sb | Z55710 |
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 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 ZXXXXX | Type A-6 96/4 Zn/Al ZXXXXX | 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 | 0.0005 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 E 29
B UNS numbers in conformance with Practice E 527
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.
Keywords
brightener; zinc; zinc alloys; zinc-aluminum alloy; zinc-antimony alloy; zinc master alloys; zinc metal; Brightener; Zinc--specifications; Zinc alloys--specifications; Zinc-aluminum (ZA) coatings; Zinc-antimony alloy; Zinc electrodeposited coatings--specifications; Zinc master alloys; Zinc metal
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Document Number
ASTM-B860-08
Revision Level
2008 EDITION
Status
Superseded
Modification Type
Revision
Publication Date
Nov. 1, 2008
Document Type
Specification
Page Count
3 pages
Committee Number
B02.04