1.1This 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.
TABLE 1 Chemical Requirements for Aluminum-Base Master Alloys
Note 1—
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. | ASTM
Alloy
(UNS) | Composition, percent |
Usage |
| Alu-
minum,
min | Copper | Iron, max | Silicon, max | Manga-
nese,
max | MagnesiumA | Zinc | Chro-
mium,
max | Nickel, max | Tin, max | Lead, maxA | Cad-
mium,
maxA |
| ZG71A
(A07131) | 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 Z33524 (AG40A) |
TABLE 2 Chemical and Color Code Requirements for Zinc-Base Master AlloysA,B,C | Common
(UNS) | Color
CodeD | Aluminum | Magnesium | Iron
max. | Copper
max. | Lead
max. | Cadmium
max. | Tin
max. | Zinc |
| V12-3
(Z33730) | Pink | 11.7–12.6 | 0.090–0.16 | 0.070 | 0.25† | 0.005 | 0.004 | 0.003 | Remainder |
| | | | | | | | | | |
| V12–5
(Z35740) | Pink/Black | 11.7–12.6 | 0.090–0.16 | 0.070 | 2.1–3.3 | 0.005 | 0.004 | 0.003 | Remainder |
1.2Aluminum 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.
1.3Zinc-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.
TABLE 3 Weight Requirements for Zinc-Base Master Alloy Jumbo Ingots
Note 1—
These requirements are based on the use of nominal 2400 lb or 1200 lb jumbo ingots of V12 (Z33730). | Nominal
Weight, lb | Weight Range, lbA | Usage |
| Minimum | Maximum |
| 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 Z33524, AG40A) |
| | | | or |
| | | | 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 Z35532, 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 Z33524, AG40A) |
| | | | or |
| | | | 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 Z35532, AC41A) |
1.4Master alloys may be supplied in the form of shot, bar, ingot or jumbo ingot as specified by the purchaser.
1.5The 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.
1.6This 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.
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