ASTM B974/B974M-10
(Specification)Standard Specification for Free-Cutting Bismuth Brass Rod, Bar and Wire
Standard Specification for Free-Cutting Bismuth Brass Rod, Bar and Wire
ABSTRACT
This specification establishes the requirements for free-cutting a bismuth brass rod, bar and wire of UNS Alloy No.C49250 and C49260 suitable for high-speed screw machine work or for general applications. Typically, products made to this specification are furnished as straight lengths or coils when requested. The material shall conform to the chemical composition requirements, tensile strength requirements, and elongation requirements stated in this specification.
SCOPE
1.1 This specification establishes the requirements for free-cutting bismuth brass rod, bar and wire of UNS Alloy No. C49250 and C49260 suitable for high-speed screw machine work, or for general applications.
1.2 Typically, product made to this specification is furnished as straight lengths, or coils when requested.
1.3 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
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.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: B974/B974M – 10
Standard Specification for
Free-Cutting Bismuth Brass Rod, Bar and Wire
This standard is issued under the fixed designation B974/B974M; 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 E92 Test Method for Vickers Hardness of Metallic Materi-
als
1.1 This specification establishes the requirements for free-
E478 TestMethodsforChemicalAnalysisofCopperAlloys
cutting bismuth brass rod, bar and wire of UNS Alloy No.
2.2 Other Standards:
C49250 and C49260 suitable for high-speed screw machine
JIS H 1068:2005 Method for Determination of Bismuth in
work, or for general applications.
Copper and Copper Alloys
1.2 Typically,productmadetothisspecificationisfurnished
ISO 5959-1984 Copper and copper alloys – determination
as straight lengths, or coils when requested.
of bismuth content – Diethyldithiocarbamate spectromet-
1.3 Units—The values stated in either SI units or inch-
ric method
pound units are to be regarded separately as standard. The
values stated in each system may not be exact equivalents;
3. General Requirements
therefore,eachsystemshallbeusedindependentlyoftheother.
3.1 The following sections of Specification B249/B249M
Combining values from the two systems may result in non-
constitute a part of this specification:
conformance with the standard.
3.1.1 Terminology,
1.4 This standard does not purport to address all of the
3.1.2 Materials and Manufacture,
safety concerns, if any, associated with its use. It is the
3.1.3 Sampling,
responsibility of the user of this standard to establish appro-
3.1.4 Number of Tests and Retests,
priate safety and health practices and determine the applica-
3.1.5 Specimen Preparation,
bility of regulatory limitations prior to use.
3.1.6 Test Methods,
2. Referenced Documents 3.1.7 Inspection,
3.1.8 Certification,
2.1 ASTM Standards:
3.1.9 Test Reports.
B249/B249M Specification for General Requirements for
3.2 In addition, when a section with a title identical to that
Wrought Copper and Copper-Alloy Rod, Bar, Shapes and
referenced in 3.1 appears in this specification, it contains
Forgings
additional requirements which supplement those appearing in
B250/B250M Specification for General Requirements for
Specification B249/B249M.
Wrought Copper Alloy Wire
B846 Terminology for Copper and Copper Alloys
4. Terminology
E8 Test Methods for Tension Testing of Metallic Materials
4.1 For definitions of terms related to copper and copper
E8M Test Methods for Tension Testing of Metallic Materi-
3 alloys, refer to Terminology B846.
als [Metric]
E53 Test Method for Determination of Copper in Unalloyed
5. Ordering Information
Copper by Gravimetry
5.1 Include the following information in orders for prod-
E54 Test Methods for ChemicalAnalysis of Special Brasses
3 ucts:
and Bronzes
5.1.1 ASTM designation and year of issue,
5.1.2 Copper UNS No. designation,
ThisspecificationisunderthejurisdictionofASTMCommitteeB05onCopper
5.1.3 Howfurnished(rodorbarinstraightlength,orwirein
and CopperAlloys and is the direct responsibility of Subcommittee B05.02 on Rod,
coils)
Bar, Wire, Shapes and Forgings.
5.1.4 Temper,
Current edition approved Oct. 1, 2010. Published November 2010.
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’s Document Summary page on Available from Japanese Industrial Standards through http://www.JIS.or.jp, or
the ASTM website. www.webstore.jsa.or.jp/webstore/JIS/Flowcontrol.JSP.
3 5
Withdrawn. The last approved version of this historical standard is referenced Available from International Organization of Standards, http://www.ISO/ISO/
on www.astm.org. store.htm.
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B974/B974M – 10
5.1.5 Cross section (round, hexagonal, square, rectangular), 7.2 These composition limits do not preclude the presence
5.1.6 Dimensions; diameter or distance between parallel of other elements. Limits may be established and analysis
surfaces, width and thickness, required for unnamed elements by agreement between the
5.1.7 How furnished: straight lengths or coils, manufacturer and the purchaser.
5.1.8 Quantity: total weight or total length, or number of 7.3 For alloys in which zinc is listed as “remainder”, zinc is
pieces of each size, the difference between the sum of results of all elements
5.1.9 If the product is purchased for agencies of the U.S. determined and 100%. When all elements in Table 1 are
Government (see the Supplemental Requirements section of determined, the sum of the results shall be 99.5% min.
Specifications B249/B249M or B250/B250M for additional
8. Temper
requirements, if specified).
8.1 The standard tempers for products described in this
5.2 The following options are available and should be
specification are given in Table 2.
specified at the time of placing the order when required:
8.1.1 Rod (round, hexagonal, and octagonal), and bar shall
5.2.1 Heat identification or traceability details.
be furnished for general use in O60 temper for maximum
5.2.2 Certification.
formability, and H02 (half-hard) for applications involving
5.2.3 Mill Test Report.
5.2.4 Automatic screw machine straightness (see 10.4). moderate cold forming.
5.2.5 Yield strength test required (see 14.2).
9. Mechanical Property Requirements
5.2.6 Resistivity test required (see 10.1).
9.1 The product shall conform to the tensile strength and
5.2.7 Marking of specification number (see 21.2).
elongation requirements of Tables 2 and 3 when tested in
accordance with Test Methods E8 and E8M.
6. Materials and Manufacture
9.2 When specified in the contract or purchase order, the
6.1 Materials:
yield strength shall be determined and conform with the yield
6.1.1 ThematerialofmanufactureshallbeaformofCopper
strength requirements of Table 2 when tested in accordance
Alloy UNS Nos. C49250 or C49260 of such purity and
with Test Methods E8 and E8M.
soundness as to be suitable for processing into the products
prescribed herein.
10. Dimensions, Mass, and Permissible Variations
6.1.2 In the event heat identification or traceability is
10.1 The dimensions and tolerances for rod and material
required, the purchaser shall specify the details desired.
described by this specification shall be as specified in Specifi-
NOTE 1—Due to the discontinuous nature of the processing of castings
cations B249/B249M or B250/B250M with particular refer-
into wrought products, it is not always practical to identify a specific
ence to the following tables and related paragraphs in those
casting analysis with a specific quantity of finished material.
specifications.
6.2 Manufacture:
10.2 Diameter or Distance Between Parallel Surfaces:
6.2.1 The product shall be manufactured by such hot work-
10.2.1 Rod (Round, Hexagonal, and Octagonal)—See 6.2
ing, cold working, and annealing processes as to produce a
and Table 1 of Specification B249/B249M.
uniform wrought structure in the finished product.
10.2.2 Bar(RectangularandSquare)—See6.2andTables7
6.2.2 Theproductshallbehotorcoldworkedtothefinished
and 10 of Specification B249/B249M.
size, and subsequently annealed when required, to meet the
10.2.3 Wire—See 6.2 and Table 1 of Specification B250/
temper properties specified.
B250M.
10.3 Lengths—O60 (soft anneal) and H02 (half hard) tem-
7. Chemical Composition
per rod and bar, See 6.3 and Tables 13 and 14 of Specification
7.1 The material shall conform to the chemical composition B249/B249M.
requirements in Table 1 for the UNS Number specified in the 10.4 Straightness—See 6.4 and Table 16 of Specification
ordering information. B249/B249M.
TABLE 1 Chemical Requirements
Element Composition, %
Copper or Copper Alloy UNS No.
C49250 C49260
Copper (incl silver) 58.0 - 61.0% 58.0 – 63.0%
Zinc Remainder Remainder
Bismuth 1.8 – 2.4% 0.50 – 1.8%
Lead 0.09% max 0.09% max
Iron 0.50% max 0.50% max
Tin 0.30% max 0.50% max
Cadmium 0.001% max 0.001% max
Phosphorus -- 0.05 – 0.15%
Silicon -- 0.10% max
Cu + sum of named elements, 99.5% min. 99.5% min
B974/B974M – 10
TABLE 2 Tensile Requirements, SI
NOTE—See Table 3 for inch–pound values.
A
Temper Designation Diameter or Distance Tensile Strength, Yield Strength at Elongation,
Standard Name Between Parallel Min, MPa 0.5 % Extension min, %
Surfaces, mm under Load, min,
MPa
Code Name Rod and Wire
O60 soft anneal 25 and under 330 140 15
over 25 to 50, incl. 305 125 20
over 50 275 105 25
B
H02 half-hard 12 and under 395 170 7
C
over 12 to 25, incl. 380 170 10
over 25 to 50, incl. 345 140 15
over 50 to 100, incl., and 310 105 20
over 100 275 105 20
Bar
Thickness, mm Width, mm
O60 soft anneal 25 and under 150 and under 305 125 20
over 25 150 and under 275 105 2
...
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