ASTM B199-12 - 1.11.2012
 
1. Scope

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

TABLE 1 Chemical Composition LimitsA
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 NumberB

Composition, %

 ASTM

UNS

 Iron

Magnesium

Aluminum

Manganese

 Zinc

Rare Earths

Zirconium

Silicon

Copper

Nickel

TotalC
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

 0.005D

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

  ...

EQ21AE

M18330

 ...

remainder

  ...

...

...

1.5 to 3.0F

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

  ...

QE22AG

 M18220E

 ...

remainder

  ...

...

...

1.8 to 2.5F

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.

 
2. Referenced Documents

AMS 2768

Heat Treatment of Magnesium Alloy Castings

B953-21

Standard Practice for Sampling Magnesium and Magnesium Alloys for Spectrochemical Analysis

B951-11(2025)

Standard Practice for Codification of Unalloyed Magnesium and Magnesium-Alloys, Cast and Wrought

E29-22

Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

E88-25

Standard Practice for Sampling Nonferrous Metals and Alloys in Cast Form for Determination of Chemical Composition

E155-20(2026)

Standard Reference Radiographs for Inspection of Aluminum and Magnesium Castings

B954-23

Standard Test Method for Analysis of Magnesium and Magnesium Alloys by Atomic Emission Spectrometry

B557-15(2023)

Standard Test Methods for Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products

E8-04

Standard Test Methods for Tension Testing of Metallic Materials

E94-04

Standard Guide for Radiographic Examination

Fed. Std. No. 123

Marking for Shipment (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.

E527-23

Standard Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)

E165-09

Standard Practice for Liquid Penetrant Examination for General Industry

B660-23

Standard Practices for Packaging/Packing of Aluminum and Magnesium Products

B661-12(2020)

Standard Practice for Heat Treatment of Magnesium Alloys

B296-20

Standard Practice for Temper Designations of Magnesium Alloys, Cast and Wrought