ASTM B860-18(2022) - 1.10.2022
 
1. 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

Z31520

Type A-6

96/4 Zn/Al

Low Purity

Z30504

Type S-1

90/10 Zn/Sb

?

Z55710

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.

 
2. Referenced Documents

E527-23

Standard Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)

B899-21

Standard Terminology Relating to Non-ferrous Metals and Alloys

B949-23

Standard Specification for General Requirements for Zinc and Zinc Alloy Products

B997-16(2021)

Standard Specification for Zinc-Aluminum Alloys in Ingot Form for Hot-Dip Coatings

ISO3815-2

Zinc and zinc alloys Part 2: Analysis by inductively coupled plasma optical emission spectrometry

B897-23

Standard Specification for Configuration of Zinc and Zinc Alloy Jumbo, Block, Half Block, and Slab Ingot

E88-11(2017)

Standard Practice for Sampling Nonferrous Metals and Alloys in Cast Form for Determination of Chemical Composition

E536-23

Standard Test Methods for Chemical Analysis of Zinc and Zinc Alloys

ISO3815-1

Zinc and zinc alloys Part 1: Analysis of solid samples by optical emission spectrometry

E29-22

Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications