Abstract
This specification covers magnesium-alloy investment castings designated as AM100A, AZ81A, AZ91C, AZ91E, AZ92A, EQ21A, EZ33A, K1A, QE22A, ZE41A, and ZK61A. Sufficient stock shall be allowed for shrinkage and, where required, for finishing; but castings of excessive weight shall not be furnished. The castings shall conform to the chemical composition requirements prescribed for magnesium, aluminum, manganese, zinc, zirconium, rare earth elements, copper, nickel, silicon, iron, and other impurities, as determined by chemical analysis, and shall meet the specified requirements for the tensile properties such as tensile strength, yield strength, and elongation. Requirements for heat treatment and tensile test are detailed. The castings shall be of uniform quality and condition, free from cracks and other injurious defects, shall be cleaned before inspection by blasting or other approved process, and shall not be repaired by welding, impregnation, peening, or other method unless it is required.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1. Scope
1.1 This specification covers magnesium-alloy investment castings designated as shown in Table 1.
TABLE 1 Chemical Composition LimitsA Note 1—
Analysis shall regularly be made for the elements specifically mentioned in this table. If, however, the presence of other elements is suspected or indicated in amounts greater than the specified limits, further analysis shall be made to determine that these elements are not present in excess of the specified limits. Note 2—
The following applied to all specified limits in this table: For purposes of acceptance and rejection, an observed value or a calculated value obtained from analysis should be rounded off to the nearest unit in the last right-hand place of figures used in expressing the specified limit. | Alloy Number B | | Composition, percent | Others
Each |
| ASTM | UNS | | Iron | Magne-
sium | | Alu-
minum | Manga-
nese | | Zinc | Zirconium |
Rare Earths | Thorium | Copper | Nickel | Silicon | TotalC
Other
Impurities |
| AM100A | M10100 | | ... | remainder | | 9.3–10.7 | 0.10–0.35 | | 0.30 | ... | ... | ... | 0.10 | 0.01 | 0.30 | 0.30 | ... |
| AZ81A | M11810 | | ... | remainder | | 7.0–8.1 | 0.13–0.35 | | 0.40–1.0 | ... | ... | ... | 0.10 | 0.01 | 0.30 | 0.30 | ... |
| AZ91C | M11914 | | ... | remainder | | 8.1–9.3 | 0.13–0.35 | | 0.40–1.0 | ... | ... | ... | 0.10 | 0.01 | 0.30 | 0.30 | ... |
| AZ91E | M11919 | | 0.005D E | remainder | | 8.1–9.3 | 0.17–0.35 | | 0.40–1.0 | ... | ... | ... | 0.015 | 0.0010 | 0.20 | 0.30 | 0.01 |
| AZ92A | M11920 | | ... | remainder | | 8.3–9.7 | 0–0.35 | | 1.6–2.4 | ... | ... | ... | 0.10 | 0.01 | 0.30 | 0.30 | ... |
| EQ21A | M18330 | | ... | remainder | | ... | ... | | ... | 0.40–1.0 | 1.5–3.0F | ... | 0.05–0.10 | 0.01 | ... | 0.30 | ... |
| EZ33A | M12330 | | ... | remainder | | ... | ... | | 2.0–3.1 | 0.50–1.0 | 2.5–4.0 | ... | 0.10 | 0.01 | ... | 0.30 | ... |
| K1A | M18010 | | ... | remainder | | ... | ... | | ... | 0.40–1.0 | ... | ... | ... | ... | ... | 0.30 | ... |
| QE22AG | M18220G | | ... | remainder | | ... | ... | | ... | 0.40–1.0 | 1.8–2.5F | ... | 0.10 | 0.01 | ... | 0.30 | ... |
| ZE41A | M16410 | | ... | remainder | | ... | 0.15 | | 3.5–5.0 | 0.40–1.0 | 0.75–1.75 | ... | 0.10 | 0.01 | ... | 0.30 | ... |
| ZK61A | M16610 | | ... | remainder | | ... | ... | | 5.5–6.5 | 0.6–1.0 | ... | ... | 0.10 | 0.01 | ... | 0.30 | ... |
1.2 Alloy designations are in accordance with Practice E527; temper designations are in accordance with Practice B296.
1.3 The values stated in inch-pound units are to be regarded as the standard. The SI values in parentheses are for information only.
2. Referenced Documents (purchase separately) 
The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
B296 Practice for Temper Designations of Magnesium Alloys, Cast and Wrought
B557 Test Methods for Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products
B660 Practices for Packaging/Packing of Aluminum and Magnesium Products
B661 Practice for Heat Treatment of Magnesium Alloys
B666/B666M Practice for Identification Marking of Aluminum and Magnesium Products
B951 Practice for Codification of Unalloyed Magnesium and Magnesium-Alloys, Cast and Wrought
B953 Practice for Sampling Magnesium and Magnesium Alloys for Spectrochemical Analysis
B954 Test Method for Analysis of Magnesium and Magnesium Alloys by Atomic Emission Spectrometry
D3951 Practice for Commercial Packaging
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E88 Practice for Sampling Nonferrous Metals and Alloys in Cast Form for Determination of Chemical Composition
E94 Guide for Radiographic Examination
E155 Reference Radiographs for Inspection of Aluminum and Magnesium Castings
E165 Practice for Liquid Penetrant Examination for General Industry
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
Military Standards
MIL-STD-129 Marking for Shipment and Storage (Military Agencies)
Federal Standards
Fed. Std. No. 123 Marking for Shipping (Civil Agencies) Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://www.dodssp.daps.mil.
Keywords
investment castings; magnesium alloy;
ICS Code
ICS Number Code 77.150.20 (Magnesium products)
DOI: 10.1520/B0403-12
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