ASTM B403-20

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:B403 −20
Standard Specification for
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Magnesium-Alloy Investment Castings
This standard is issued under the fixed designation B403; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* B951 PracticeforCodificationofUnalloyedMagnesiumand
Magnesium-Alloys, Cast and Wrought
1.1 This specification covers magnesium-alloy investment
B953 Practice for Sampling Magnesium and Magnesium
castings designated as shown in Table 1.
Alloys for Spectrochemical Analysis
1.2 Alloy designations are in accordance with Practice
B954 Test Method for Analysis of Magnesium and Magne-
E527; temper designations are in accordance with Practice
sium Alloys by Atomic Emission Spectrometry
B296.
D3951 Practice for Commercial Packaging
E29 Practice for Using Significant Digits in Test Data to
1.3 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical Determine Conformance with Specifications
E94 Guide for Radiographic Examination Using Industrial
conversions to SI units that are provided for information only
and are not considered standard. Radiographic Film
E155 Reference Radiographs for Inspection of Aluminum
1.4 This international standard was developed in accor-
and Magnesium Castings
dance with internationally recognized principles on standard-
E165 Practice for Liquid Penetrant Testing for General
ization established in the Decision on Principles for the
Industry
Development of International Standards, Guides and Recom-
E527 Practice for Numbering Metals and Alloys in the
mendations issued by the World Trade Organization Technical
Unified Numbering System (UNS)
Barriers to Trade (TBT) Committee.
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2.3 Federal Standards:
Fed. Std. No. 123 Marking for Shipping (Civil Agencies)
2. Referenced Documents
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2.4 Military Standards:
2.1 The following documents of the issue in effect on the
MIL-STD-129 Marking for Shipment and Storage (Military
date of order acceptance form a part of this specification to the
Agencies)
extent referenced herein:
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3. Ordering Information
2.2 ASTM Standards:
B296 Practice for Temper Designations of Magnesium 3.1 Orders for castings under this specification shall include
Alloys, Cast and Wrought
the following information:
B557 Test Methods for Tension Testing Wrought and Cast 3.1.1 Quantity of each casting,
Aluminum- and Magnesium-Alloy Products
3.1.2 Alloy (see Section 6 and Table 1),
B660 Practices for Packaging/Packing of Aluminum and
3.1.3 Temper (see 5.1 and Table 2),
Magnesium Products
3.1.4 Casting drawing giving all necessary dimensions and
B661 Practice for Heat Treatment of Magnesium Alloys
showing amount of finish left for machining,
B666/B666M Practice for Identification Marking of Alumi-
3.1.5 Surface treatment (see 10.1),
num and Magnesium Products
3.1.6 Whether certification is required (see 11.1),
3.1.7 Whether inspection is required at the manufacturer’s
works (see 12.1), and
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This specification is under the jurisdiction of ASTM Committee B07 on Light
3.1.8 Special inspection requirements (see 12.3).
Metals and Alloys and is the direct responsibility of Subcommittee B07.04 on
Magnesium Alloy Cast and Wrought Products.
4. Materials and Manufacture
Current edition approved Nov. 1, 2020. Published December 2020. Originally
4.1 The responsibility for furnishing castings that can be
approved in 1963. Last previous edition approved in 2012 as B403 – 12. DOI:
10.1520/B0403-20.
laid out and machined to the finished dimensions within the
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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Standards volume information, refer to the standard’s Document Summary page on Available from DLA Document Services, Building 4/D, 700 Robbins Ave.,
the ASTM website. Philadelphia, PA 19111-5094, http://quicksearch.dla.mil.
*A Summary of Changes section appears at the end of this standard
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B403−20
A
TABLE 1 Chemical Composition Limits
NOTE1—Analysisshallregularlybemadefortheelementsspecificallymentionedinthistable.If,however,thepresenceofotherelementsissuspected
or indicated in amounts greater than the specified limits, further analysis
...