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1.1 This specification covers aluminum–base and zinc–base master alloys used to make zinc die-casting alloys. Alloy compositions specified for aluminum–base master alloys (hardeners) are designated as shown in Table 1. Alloy compositions specified for the zinc-base master alloys are designated as shown in Table 2.
1.2 Aluminum alloy hardeners are added to Special High Grade zinc (per Specification B6) in the proper alloying ratios, as shown in Table 1, to produce zinc alloys for die casting.
1.3 Zinc-base master alloy is added to Special High Grade zinc (per Specification B6) in the proper alloying ratio, as shown in Table 3, to produce zinc alloy for die casting.
1.4 Master alloys may be supplied in the form of shot, bar, ingot or jumbo ingot as specified by the purchaser.
1.5 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.
1.6 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 for Aluminum-Base Master Alloys
Note—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.
|Composition, percent|| |
|Copper||Iron, max||Silicon, max||Manga-|
|Nickel, max||Tin, max||Lead, maxA||Cad-|
|ZG71A†||87.0||1.7 max||0.8||0.7||0.50||0.65–1.05||6.5–7.5||0.20||0.20||0.02||0.020||0.010||1 part by weight of ZG71A, 21 parts by weight of Special High Grade zincB to make ASTM zinc Alloy Z33520 (AG40A)|
A Carried to one additional decimal place to ensure proper control in the final alloy.
B ASTM Specification B6, for Zinc.
TABLE 2 Chemical and Color Code Requirements for Zinc-Base Master AlloysA,B,C
(Z- - - - -)
A Zinc-base master alloys V12-3 (Z33730) and V12-5 (Z- - - - -) used for producing die casting alloys may contain nickel, chromium, silicon, and manganese up to 0.02, 0.02, 0.035 and 0.05 %, respectively. No harmful effects have ever been noted due to the presence of these elements in up to these concentrations in die casting alloys and, therefore, analyses are not required for these elements, except that nickel analysis is required when producing die casting alloy Z33522 or Z35530.
B The UNS assignations were established in accordance with Practice E527.
C 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.
D Refer to Practice B908. (Note: Color Codes indicated are for North American applications.)
TABLE 3 Weight Requirements for Zinc-Base Master Alloy Jumbo Ingots
Note—These requirements are based on the use of nominal 2400 lb or 1200 lb jumbo ingots of V12 (Z33730).
|Weight Range, lbA||Usage|
|2400||2325||2475||1 part by weight of V12-3 (one 2400 lb jumbo ingot), 2 parts by weight (two 2400 lb jumbo ingots) of Special High Grade zinc to make zinc alloy 3 (Zamak 3, UNS Z33520, AG40A)|
|1 part by weight of V12-5 (one 2400 lb jumbo ingot), 2 parts by weight (two 2400 lb jumbo ingots) of Special High Grade zinc to make zinc alloy 5 (Zamak 5, UNS Z35531, AC41A)|
|1200||1150||1250||1 part by weight of V12-3 (one 1200 lb jumbo ingot), 2 parts by weight (one 2400 lb jumbo ingot) of Special High Grade zinc to make zinc alloy 3 (Zamak 3, UNS Z33520, AG40A)|
|1 part by weight of V12-5 (one 1200 lb jumbo ingot), 2 parts by weight (one 2400 lb jumbo ingot) of Special High Grade zinc to make zinc alloy 5 (Zamak 5, UNS Z35531, AC41A)|
A Jumbo ingots outside the above weight limits may be acceptable depending upon the chemistry, if mutually agreed upon between the producer and purchaser.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
B6 Specification for Zinc
B275 Practice for Codification of Certain Zinc, Tin and Lead Die Castings
B899 Terminology Relating to Non-ferrous Metals and Alloys
B908 Practice for the Use of Color Codes for Zinc Casting Alloy Ingot
B949 Specification for General Requirements for Zinc and Zinc Alloy Products
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E34 Test Methods for Chemical Analysis of Aluminum and Aluminum-Base Alloys
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
E1251 Test Method for Analysis of Aluminum and Aluminum Alloys by Spark Atomic Emission Spectrometry
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
ICS Number Code 77.120.10 (Aluminium and aluminium alloys)
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ASTM B327-12, Standard Specification for Master Alloys Used in Making Zinc Die Casting Alloys, ASTM International, West Conshohocken, PA, 2012, www.astm.orgBack to Top