ASTM B793-13 - 1.2.2013
 
1. Scope

1.1 This specification covers commercial zinc alloys in ingot form for remelting for the manufacture of dies and molds from the alloys as shown in Table 1.

TABLE 1 Chemical and North American Color Code RequirementsA,B

 

Composition, %    

UNS Z35543
Alloy A
Kirksite A

UNS Z35542
Alloy B
Kirksite B

Color CodeC

Green/Red

Green/Black

Element

 

 

Aluminum

3.5–4.5

3.9–4.3

Cadmium

0.005 max

0.003 max

Copper

2.5–3.5

2.5–2.9

Iron

0.100 max

0.075 max

Lead

0.007 max

0.003 max

Magnesium

0.02–0.10

0.02–0.05

Tin

0.005 max

0.001 max

Zinc

Remainder

Remainder

A The following applies to all specified limits in this table: For purposes of determining conformance with this specification, the observed value or calculated value obtained from analysis shall be rounded off “to the nearest unit” in the last right hand place of figures used in expressing the specified limit, in accordance with the rounding method of Practice E29.
B UNS designations were established in accordance with Practice E527.
C Refer to Practice B908. (Note: Colors indicated are for North American applications.)

1.2 This specification presents requirements for zinc alloys suitable for the production of sand cast or plaster cast forming dies for sheet metal stamping operations and plastic injection molding. Alloy A is intended for use in the fabrication of dies for sheet metal stamping under drop hammer and hydraulic pressure. Alloy B is a special purpose alloy of closely controlled composition and is primarily used in the manufacture of plastic injection molds.

1.3 This specification covers two zinc alloys which are specified and designated as follows:

UNS

ASTM

Traditional

 

 

 

Z35543

Alloy A

Kirksite A

Z35542

Alloy B

Kirksite B


1.4 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.

1.5 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.

 
2. Referenced Documents

ISO3815-1

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

ISO3815-2

B897-23

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

E536-23

Standard Test Methods for Chemical Analysis of Zinc and Zinc Alloys

E29-22

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

E88-25

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

B949-23

Standard Specification for General Requirements for Zinc and Zinc Alloy Products

E527-23

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

B908-22

Standard Practice for the Use of Color Codes for Zinc Casting Alloy Ingot

B899-25

Standard Terminology Relating to Non-ferrous Metals and Alloys