ASTM B199 : 12

Standard Specification for Magnesium-Alloy Permanent Mold Castings

Standard Details

1.1 This specification covers magnesium alloy permanent mold casting alloys designated as shown in Table 1.

TABLE 1 Chemical Composition Limits^A

Note 1—Analysis shall regularly be made only 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 applies to all specified limits in this table: For purposes of acceptance and rejection, an observed value or a calculated value obtained from analysis shall be rounded to the nearest unit in the last right-hand place of figures used in expressing the specified limit.

Alloy Number^B			Composition, %
ASTM	UNS	Iron	Magnesium	Aluminum	Manganese	Zinc	Rare Earths	Zirconium	Silicon	Copper	Nickel	Total^C Other Impuri- ties	Others Each
AM100A	M10100	...	remainder	9.3 to 10.7	0.10–0.35	0.30	...	...	0.30	0.10	0.01	0.30	...
AZ81A	M11810	...	remainder	7.0 to 8.1	0.13–0.35	0.40 to 1.0	...	...	0.30	0.10	0.01	0.30	...
AZ91C	M11914	...	remainder	8.1 to 9.3	0.13–0.35	0.40 to 1.0	...	...	0.30	0.10	0.01	0.30	...
AZ91E	M11919	0.005^D	remainder	8.1 to 9.3	0.17–0.35	0.40 to 1.0	...	...	0.20	0.015	0.0010	0.30	0.01
AZ92A	M11920	...	remainder	8.3 to 9.7	0.10–0.35	1.6 to 2.4	...	...	0.30	0.25	0.01	0.30	...
EQ21A^E	M18330	...	remainder	...	...	...	1.5 to 3.0^F	0.40 to 1.0	...	0.05–0.10	0.01	0.30	...
EZ33A	M12330	...	remainder	...	...	2.0 to 3.1	2.5 to 4.0	0.50 to 1.0	...	0.10	0.01	0.30	...
QE22A^G	M18220^E	...	remainder	...	...	...	1.8 to 2.5^F	0.40 to 1.0	...	0.10	0.01	0.30	...

^A Limits are in weight percent max unless shown as a range or stated otherwise.

^B ASTM alloy designations were established in accordance with Practice B951. UNS designations were established in accordance with Practice E527.

^C Includes listed elements for which no specific limit is shown.

^D If iron exceeds 0.005 %, the iron to manganese ratio shall not exceed 0.032.

^E Silver content for Alloy EQ21A (M18330) shall be 1.3 to 1.7 %.

^F Rare earth elements are in the form of didymium.

^G Silver content for Alloy QE22A (M18220) shall be 2.0 to 3.0, inclusive.

1.2 The values stated in inch-pound units are to be regarded as the standard. The SI values given in parentheses are provided for information only.

1.3 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 establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.