ASTM B21/B21M-12

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Designation:B21/B21M–06 Designation: B21/B21M – 12
Standard Specification for
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Naval Brass Rod, Bar, and Shapes
This standard is issued under the fixed designation B21/B21M; 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.
1. Scope*
1.1 This specification establishes the requirements for naval brass rod, bar, and shapes produced from CopperAlloy UNS Nos.
C46200, C46400, C47940, C48200, or C48500.
1.1.1 For piston-finish rod or shafting refer to the Other Requirements Section.
1.1.2 For hot forging material, refer to Specification B124/B124M.
1.2 Units—The values stated in inch-pound units or SI units are to be regarded separately as standard. Within the text, SI units
are shown in brackets. The values stated in each system aremay not be exact equivalents; therefore, each system shall be used
independently of the other. Combining values from the two systems may result in nonconformance with the specification.
1.3 Warning—Mercury is a definite health hazard in use and disposal (see Performance Requirements).
1.4 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
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2.1 ASTM Standards:
B124/B124M Specification for Copper and Copper Alloy Forging Rod, Bar, and Shapes
B154 Test Method for Mercurous Nitrate Test for Copper Alloys
B249/B249M Specification for General Requirements for Wrought Copper and Copper-Alloy Rod, Bar, Shapes and Forgings
B601 Classification for Temper Designations for Copper and Copper AlloysWrought and Cast
B858 Test Method for Ammonia Vapor Test for Determining Susceptibility to Stress Corrosion Cracking in Copper Alloys
B950 Guide for Editorial Procedures and Form of Product Specifications for Copper and Copper Alloys
E8 Test Methods for Tension Testing of Metallic Materials
E8M Test Methods for Tension Testing of Metallic Materials [Metric]
E18 Test Methods for Rockwell Hardness of Metallic Materials
E478 Test Methods for Chemical Analysis of Copper Alloys
3. General Requirements
3.1 The following sections of Specification B249/B249M constitute a part of this specification:
3.1.1 Terminology,
3.1.2 Materials and Manufacture,
3.1.3 Workmanship, Finish, and Appearance,
3.1.4 Sampling,
3.1.5 Number of Tests and Retests,
3.1.6 Specimen Preparation,
3.1.7 Test Methods,
3.1.8 Significance of Numerical Limits,
3.1.9 Inspection,
3.1.10 Rejection and Rehearing,
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This specification is under the jurisdiction ofASTM Committee B05 on Copper and CopperAlloys and is the direct responsibility of Subcommittee B05.02 on Rod, Bar,
Wire, Shapes and Forgings.
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Current edition approved Feb. 1, 2006. Published February 2006. Originally approved in 1918. Last previous edition approved in 2001 as B21/B21M–01 . DOI:
10.1520/B0021_B0021M-06.
Current edition approved April 1, 2012. Published May 2012. Originally approved in 1918. Last previous edition approved in 2006 as B21/B21M – 06. DOI:
10.1520/B0021_B0021M-12.
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For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. ForAnnualBookofASTMStandards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*ASummary of Changes section appears at the end of this standard.
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B21/B21M – 12
3.1.11 Certification,
3.1.12 Mill Test Report,
3.1.13 Packaging and Product Marking, and
3.1.14 Supplementary Requirements.
3.2 In addition, when a section with a title identical to that referenced in 3.1, above, appears in this specification, it contains
additional requirements which supplement those appearing in Specification B249/B249M.
4. Ordering Information
4.1 Include the following informationspecified choices when placing orders for product under this specification, as applicable:
4.1.1 ASTM designation and year of issue,
4.1.2 Copper Alloy UNS No. designation (Scope),
4.1.3 Temper (Temper Section and related Tables),
4.1.4 Form—cross-section such as round, hexagonal, square, and so forth,
4.1.
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