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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.
|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)|
|Type A-3 |
|Type A-4 |
|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|
|Others, Total||0.01 max||0.25 max||0.01 max||0.25 max||0.01 max||0.25 max||0.03 max|
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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
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
B949 Specification for General Requirements for Zinc and Zinc Alloy Products
B997 Specification for Zinc-Aluminum Alloys in Ingot Form for Hot-Dip Coatings
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)
E536 Test Methods for Chemical Analysis of Zinc and Zinc Alloys
ISO StandardsISO3815-1 Zinc and zinc alloys Part 1: Analysis of solid samples by optical emission spectrometry ISO3815-2 Zinc and zinc alloys Part 2: Analysis by inductively coupled plasma optical emission spectrometry
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ASTM B860-08, Standard Specification for Zinc Master Alloys for Use in Hot Dip Galvanizing, ASTM International, West Conshohocken, PA, 2008, www.astm.orgBack to Top