ASTM B16/B16M-19

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it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B16/B16M − 10 (Reapproved 2015) B16/B16M − 19
Standard Specification for
Free-Cutting Brass Rod, Bar and Shapes for Use in Screw
Machines
This standard is issued under the fixed designation B16/B16M; 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*
1.1 This specification establishes the requirements for free-cutting brass rod, bar, wire, and shapes of any specified cross section
produced from Copper Alloy UNS Nos. C36000 or C36010 suitable for high-speed screw machining applications and moderate
thread rolling.
1.2 Units—Values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in
each system mayare not benecessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be
used independently of the other. Combiningother and values from the two systems may result in non-conformance with the
standard.shall not be combined.
1.2.1 Within the text, SI units are shown in brackets.
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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.4 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.
2. Referenced Documents
2.1 ASTM Standards:
B249/B249M Specification for General Requirements for Wrought Copper and Copper-Alloy Rod, Bar, Shapes and Forgings
B250/B250M Specification for General Requirements for Wrought Copper Alloy Wire
B601 Classification for Temper Designations for Copper and Copper Alloys—Wrought and Cast
E8/E8M Test Methods for Tension Testing of Metallic Materials
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 Specifications B249/B249M (rod, bar, and shapes), and B250/B250M (wrought copper alloy wire)
constitute a part of this specification.
3.1.1 Terminology,Terminology;
3.1.2 Materials and Manufacture,Manufacture;
3.1.3 Workmanship, Finish, and Appearance,Appearance;
3.1.4 Sampling,Sampling;
3.1.5 Number of Tests and Retest,Retest;
3.1.6 Specimen Preparation,Preparation;
3.1.7 Test Methods,Methods;
This specification is under the jurisdiction of ASTM Committee B05 on Copper and Copper Alloys and is the direct responsibility of Subcommittee B05.02 on Rod, Bar,
Wire, Shapes and Forgings.
Current edition approved May 1, 2015Oct. 1, 2019. Published May 2015November 2019. Originally approved in 1917. Last previous edition approved in 20102015 as
B16/B16M – 10.B16/B16M–10 (2015). DOI: 10.1520/B0016_B0016M-10R15.10.1520/B0016_B0016M–19.
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 Standards
volume information, refer to the standard’sstandard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B16/B16M − 19
3.1.8 Significance of Numerical Limits,Limits;
3.1.9 Inspection,Inspection;
3.1.10 Rejection and Rehearing,Rehearing;
3.1.11 Certification,Certification;
3.1.12 Mill Test Report,Report;
3.1.13 Packaging and Package Marking,Marking; and
3.1.14 Supplementary Requirements.
3.2 In addition, when a section with a title identical to those referenced in 3.1 appears in this specification, it contains additional
requirements that supplement those appearing in Specifications B249/B249M and B250/B250M.
4. Ordering Information
4.1 Include the following information when placing orders for product under this specification, as applicable:
4.1.1 ASTM specification designation and year of issue (B16/B16M – XX).
4.1.2 Copper Alloy UNS No. designations (C36000 or C36010, see Section 6 and Table 1). Unless otherwise specified, the alloy
supplied will be C36000.
4.1.3 Temper (see Section 7 and Tables 2-5).
4.1.4 Product cross section form (for example, round, hexagonal, square, etc.).
4.1.5 Dimensions (see Section 9).
4.1.6 How furnished: straight lengths or coils (see 5.2).
4.1.7 Edge contours (see Section 9).
4.1.8 Quantity; total weight, footage, or number of pieces for each size.
4.1.9 When product is purchased for applications requiring thread rolling (see 1.1, Tables 2-5).
4.1.10 When product is purchased for agencies of the U.S. Government (see Section 11).
4.2 The following options are available and shall be specified at the time of placing the order when required:
4.2.1 Tensile test for product ⁄2 in. [12 mm] and over (see 8.2.1).
4.2.2 Certification (refer to Specifications B249/B249M or B250/B250M).
4.2.3 Mill Test Report (refer to Specifications B249/B249M or B250/B250M).
5. Materials and Manufacture
5.1 Material—The material of manufacture shall be a cast billet of Copper Alloy UNS No. C36000 or C36010 and of such purity
and soundness as to be suitable for hot extrusion into rod, bar, wire, and shaped products.
5.1.1 In the event that heat identification or traceability is required, the purchaser shall specify the details desired.
NOTE 1—Due to the discontinuous nature of the processing of castings into wrought products, it is not always practical to identify a specific casting
analysis with a specific quantity of finished material.
5.2 Manufacture—Product produced under this specification shall be in straight lengths; however, it shall be furnished in coils
when so specified in the contract or purchase order (see 4.1.6).
6. Chemical Composition
6.1 The product shall conform to the chemical compositional requirements specified in Table 1 for Copper Alloy UNS No.
C36000 or C36010.
6.2 The UNS designated composition limits do not preclude the possible presence of other unnamed elements; however,
analysis shall be made regularly only for the minor elements listed in Table 1, plus either copper or zinc, or plus all major elements
except one. The major element that is not analyzed shall be determined by difference between the sum of those elements analyzed
and 100 %. By agreement between producer or supplier and purchaser, analysis may be required and limits established for the
elements not cited. Percentage content of elements shown as “remainder” (rem.) is calculated by difference.
TABLE 1 Chemical Requirements
Copper Alloy UNS No. C36000 and C36010
Element Composition, %
Copper Alloy UNS No.
C36000 C36010
Copper 60.0 - 63.0 60.0 – 63.0
Copper 60.0 to 63.0 60.0 to 63.0
Lead 2.5 - 3.0 3.1 – 3.7
Lead 2.5 to 3.0 3.1 to 3.7
Iron, max 0.35 0.35
Zinc Remainder Remainder
B16/B16M − 19
TABLE 2 Tensile Requirements, inch-pound
NOTE 1—See Table 3 for SI values.
Yield Strength
at 0.5 %
A
Temper Designation Diameter or Distance Between Tensile Strength,
Elongation,
Extension
min, %
Standard Name Parallel Surfaces, in. min, ksi
under Load,
min, ksi
Rod and Wire
O60 soft 1 and under 48 20 15
anneal
over 1 to 2, incl. 44 18 20
over 2 40 15 25
B
H02 half-hard ⁄2 and under 57 25 7
B
H02 half-hard under ⁄2 57 25 7
1 C
over ⁄2 to 1, incl. 55 25 10
C
⁄2 to 1, incl. 55 25 10
over 1 to 2, incl. 50 20 15
over 2 to 4, incl., and 45 15 20
over 4 40 15 20
1 3
H04 hard ⁄16 to ⁄16 incl. 80 45
3 1
over ⁄16 to ⁄2 incl. 70 35 4
1 3
over ⁄2 to ⁄4 incl. 65 30 6
Bar
Standard Name Thickness, in. Width, in.
O60 soft anneal 1 and under 6 and under 44 18 20
over 1 6 and under 40 15 25
H02 half-hard ⁄2 and under 1 and under 50 25 10
⁄2 and under over 1 to 6, incl. 45 17 15
over ⁄2 to 2, incl. 2 and under 45 17 15
over ⁄2 to 2, incl. over 2 to 6, incl. 40 15 20
over 2 over 2 to 4, incl. 40 15 20
A
In any case, a minimum gage length of 1 in. shall be used.
B
For product furnished in coils the elongation shall be 4 % min.
C
If product is specified for thread rolling applications, the minimum tensile strength shall be 52 ksi.
6.3 When all elements in Table 1 are analyzed, their sum shall be 99.5 % min.
7. Temper
7.1 Tempers, as defined in PracticeClassification B601, identified in Tables 2-5 for product produced under this specification,
are as follows:
7.1.1 O60 (soft anneal).
7.1.2 H02 (half hard).
7.1.3 H04 (hard).
7.2 Rod and bar shall be furnished in the H02 (half hard) temper, unless otherwise specified in the ordering information (see
4.1.3).
8. Mechanical Property Requirements
8.1 Rockwell Hardness:
...