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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.
Область применения1.1 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
Z31520
Type A-6
96/4 Zn/Al
Low Purity
Z30504
Type S-1
90/10 Zn/Sb
Z55710
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
Z31520
Type A-6
96/4 Zn/Al
Z30504
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
0.005 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 E29.(B) UNS numbers in conformance with Practice E527.(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.Note 1: The master alloys in Specification B860 are intended to be used primarily in hot-dip galvanizing to adjust the concentration of certain elements in a molten zinc bath, and differ from the zinc-aluminum alloys in Specification B997 which are intended to be used primarily in molten zinc-aluminum.
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.