ASTM B91 - 12

    Standard Specification for Magnesium-Alloy  Forgings

    Active Standard ASTM B91 | Developed by Subcommittee: B07.04

    Book of Standards Volume: 02.02


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    Abstract

    This specification covers UNS M11311, M11610, M11800, or M16600 magnesium alloy forgings. The conformance of each material to the required chemical composition can be determined using any suitable method of chemical analysis. Samples for chemical analysis should be taken when the ingots are poured or from the finished or semi-finished products by drilling, sawing, milling, turning, or clipping. The variations in testing speed do not seriously affect the obtained tensile property values. However, care must be exercised so that the testing speed does not exceed the ability of the equipment to function satisfactorily. Unless specified, forgings should be chrome pickled before shipment.

    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 forgings designated as shown in Table 1.

    TABLE 1 Chemical Composition LimitsA,B
    Note 1Analysis 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 2The 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 should be rounded to the nearest unit in the last right-hand place of figures used in expressing the specified limit.

     

    Composition, %

    Element

    Alloy AZ31B
      (UNS No.
      M11311)

    Alloy AZ61A
      (UNS No.
      M11610)

    Alloy AZ80A
      (UNS No.
      M11800)

    Alloy ZK60A
      (UNS No.
      M16600)

       Magnesium

      remainder

      remainder

      remainder

      remainder

       Aluminum

      2.5–3.5

      5.8–7.2

      7.8–9.2

      ...

       Manganese

      0.20–1.0

      0.15–0.5

      0.12–0.5

      ...

       Zinc

      0.6–1.4

      0.40–1.5

      0.20–0.8

      4.8–6.2

       Thorium

      ...

      ...

      ...

      ...

       Zirconium, min

      ...

      ...

     

      0.45

       Silicon

      0.10

      0.10

      0.10

      ...

       Copper

      0.05

      0.05

      0.05

      ...

       Nickel

      0.005

      0.005

      0.005

      ...

       Iron

      0.005

      0.005

      0.005

      ...

       Calcium

      0.04

      ...

      ...

      ...

       Other impuritiesC

      0.30

      0.30

      0.30

      0.30

    A Limits are in weight percent maximum unless shown as a range or stated otherwise.
    B  These alloy designations were established in accordance with Practice B951.
    C  Includes listed elements for which no specific limit is shown.

    1.2 The values stated in inch-pound units are the standard. The SI values in parentheses are provided 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

    B557 Test Methods for Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products

    B660 Practices for Packaging/Packing 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

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    E55 Practice for Sampling Wrought Nonferrous Metals and Alloys for Determination of Chemical Composition

    Federal Standards

    No.184 Identification Marking of Aluminum, Magnesium, and Titanium.

    Military Standards

    MIL-STD-129 Marking for Shipment and Storage


    ICS Code

    ICS Number Code 77.150.20 (Magnesium products)

    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/B0091-12

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