ASTM B793-98e1

Standard Specification for Zinc Casting Alloy Ingot for Sheet Metal Forming Dies and Plastic Injection Molds

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.
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 ASTMZ35543 Alloy AZ35542 Alloy B
1.4 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 Data Sheet 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.

General Information

• Status: Historical
• Publication Date: 09-May-2001
• ICS: 77.120.60 - Lead, zinc, tin and their alloys
• Technical Committee: B02 - Nonferrous Metals and Alloys
• Drafting Committee: B02.04 - Zinc and Cadmium

Relations

• Replaced By: ASTM B793-01 - Standard Specification for Zinc Casting Alloy Ingot for Sheet Metal Forming Dies and Plastic Injection Molds
• Effective Date: 10-May-2001
• Referred By: ASTM B949-23 - Standard Specification for General Requirements for Zinc and Zinc Alloy Products
• Effective Date: 10-May-2001
• Referred By: ASTM B908-22 - Standard Practice for the Use of Color Codes for Zinc Casting Alloy Ingot
• Effective Date: 10-May-2001

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
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Designation: B 793 – 98
Standard Specification for
Zinc Casting Alloy Ingot for Sheet Metal Forming Dies and
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Plastic Injection Molds
This standard is issued under the fixed designation B 793; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
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e NOTE—The caveat in section 1.4 and section 3. Terminology were added editorially in December 2000.
A,B
TABLE 1 Chemical Requirements
1. Scope
Composition, %
1.1 This specification covers commercial zinc alloys in
Element
UNS Z35543 UNS Z35542
ingot form for remelting for the manufacture of dies and molds
Alloy A Alloy B
from the alloys as shown in Table 1.
Aluminum 3.5–4.5 3.9–4.3
1.2 This specification presents requirements for zinc alloys
Cadmium 0.005 max 0.003 max
suitable for the production of sand cast or plaster cast forming
Copper 2.5–3.5 2.5–2.9
dies for sheet metal stamping operations and plastic injection Iron 0.100 max 0.075 max
Lead 0.007 max 0.003 max
molding. Alloy A is intended for use in the fabrication of dies
Magnesium 0.02–0.10 0.02–0.05
for sheet metal stamping under drop hammer and hydraulic
Tin 0.005 max 0.001 max
pressure. Alloy B is a special purpose alloy of closely con- Zinc Remainder Remainder
A
trolled composition and is primarily used in the manufacture of
The following applies to all specified limits in this table: For purposes of
determining conformance with this specification, the observed value or calculated
plastic injection molds.
value obtained from analysis shall be rounded off “to the nearest unit” in the last
1.3 This specification covers two zinc alloys which are
right hand place of figures used in expressing the specified limit, in accordance
specified and designated as follows:
with the rounding method of Practice E 29.
B
UNS designations were established in accordance with Practice E 527.
UNS ASTM
Z35543 Alloy A
Z35542 Alloy B
E 47 Test Methods for Chemical Analysis of Zinc Die-
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1.4 This standard does not purport to address all of the Casting Alloys
safety concerns, if any, associated with its use. It is the
E 88 Practice for Sampling Nonferrous Metals and Alloys
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responsibility of the user of this standard to become familiar in Cast Form for Determination of Chemical Composition
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with all hazards including those identified in the appropriate
E 527 Practice for Numbering Metals and Alloys (UNS)
Material Data Sheet for this product/material as provided by
E 536 Test Method for Chemical Analysis of Zinc and Zinc
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the manufacturer, to establish appropriate safety and health
Alloys
practices, and determine the applicability of regulatory limi-
3. Terminology
tations prior to use.
3.1 Terms shall be defined in accordance with Terminology
2. Referenced Documents
B 899.
2.1 The following documents of the issue in effect on date
4. Ordering Information
of order acceptance form a part of this specification to the
extent referenced herein: 4.1 Orders for ingots under this specification shall include
2.2 ASTM Standards:
the following information:
B 899 Terminology Relating to Non-ferrous Metals and 4.1.1 Quantity in pounds,
2
Alloys 4.1.2 Alloy (Table 1),
E 29 Practice for Using Significant Digits in Test Data to 4.1.3 Size, if not manufacturer’s standard,
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Determine Conformance With Specifications 4.1.4 Specification number and date,
4.1.5 Source inspection (Section 7), and
4.1.6 Marking (Section 9).
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This specification is under the jurisdiction of ASTM Committee B-2 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
B02.04 on Zinc and Cadmium.
Current edition approved Apr. 10, 1998. Published September 1998. Originally
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published as B 793 – 88. Last previous edition B 793 – 95. Annual Book of ASTM Standards, Vol 03.05.
2 5
Annual Book of ASTM Standards, Vol 02.04. Annual Book of ASTM Standards, Vol 01.01.
3 6
Annual Book of ASTM Standards, Vol 14.02. Annual Book of ASTM Standards, Vol 03.06.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
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B 793
5. Materials and Manufacture case of dispute, the results secured by Test Method E 536 and
Test Method E 47 for tin only shall be the basis of acceptance.
5.1 The alloys may be made by any approved process.
5.2 The material covered by this specification shall be of
7. Source Inspection
uniform quality and shall be free from dross, slag, or other
7.1 If the purchaser desires that his representative inspect or
harmful contamination.
witness the inspection and testing of the product prior to
shipment, such agreement shall be made by the purchaser and
6. Chemi
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