ASTM B974/B974M-16(2021)
(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, C49260, C49265, C49340, and C49345 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 are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 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.
General Information
Relations
Standards Content (Sample)
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: B974/B974M −16 (Reapproved 2021)
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* E8/E8M Test Methods for Tension Testing of Metallic Ma-
terials
1.1 This specification establishes the requirements for free-
E53 Test Method for Determination of Copper in Unalloyed
cutting bismuth brass rod, bar and wire of UNS Alloy No.
Copper by Gravimetry
C49250, C49260, C49265, C49340, and C49345 suitable for
E54 Test Methods for ChemicalAnalysis of Special Brasses
high-speed screw machine work, or for general applications.
and Bronzes (Withdrawn 2002)
1.2 Typically,productmadetothisspecificationisfurnished
E62 Test Methods for Chemical Analysis of Copper and
as straight lengths, or coils when requested.
CopperAlloys(PhotometricMethods)(Withdrawn2010)
1.3 Units—The values stated in either SI units or inch- E92 Test Methods for Vickers Hardness and Knoop Hard-
ness of Metallic Materials
pound units are to be regarded separately as standard. The
values stated in each system are not necessarily exact equiva- E478 Test Methods for ChemicalAnalysis of CopperAlloys
E527 Practice for Numbering Metals and Alloys in the
lents; therefore, to ensure conformance with the standard, each
system shall be used independently of the other, and values Unified Numbering System (UNS)
from the two systems shall not be combined.
2.2 Other Standards:
JIS H 1068:2005 Method for Determination of Bismuth in
1.4 This standard does not purport to address all of the
Copper and Copper Alloys
safety concerns, if any, associated with its use. It is the
ISO5959-1984 Copperandcopperalloys–determinationof
responsibility of the user of this standard to establish appro-
bismuth content – Diethyldithiocarbamate spectrometric
priate safety, health, and environmental practices and deter-
method
mine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accor-
3. General Requirements
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the 3.1 The following sections of Specification B249/B249M
Development of International Standards, Guides and Recom-
for rod and bar, and Specification B250/B250M for wire
mendations issued by the World Trade Organization Technical
constitute a part of this specification:
Barriers to Trade (TBT) Committee.
3.1.1 Terminology,
3.1.2 Materials and Manufacture,
2. Referenced Documents
3.1.3 Sampling,
3.1.4 Number of Tests and Retests,
2.1 ASTM Standards:
3.1.5 Specimen Preparation,
B249/B249M Specification for General Requirements for
3.1.6 Test Methods,
Wrought Copper and Copper-Alloy Rod, Bar, Shapes and
3.1.7 Inspection,
Forgings
3.1.8 Certification, and
B250/B250M Specification for General Requirements for
3.1.9 Test Reports.
Wrought Copper Alloy Wire
B846 Terminology for Copper and Copper Alloys
3.2 In addition, when a section with a title identical to that
referenced in 3.1 appears in this specification, it contains
additional requirements which supplement those appearing in
ThisspecificationisunderthejurisdictionofASTMCommitteeB05onCopper
and CopperAlloys and is the direct responsibility of Subcommittee B05.02 on Rod,
Bar, Wire, Shapes and Forgings.
Current edition approved Jan. 1, 2021. Published January 2021. Originally The last approved version of this historical standard is referenced on
approved in 2010. Last previous edition approved in 2016 as B974/B974M – 16. www.astm.org.
DOI: 10.1520/B0974_B0974M-16R21. Available from Japanese StandardsAssociation (JSA), Mita MTBldg., 3-13-12
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Mita, Minato-ku, Tokyo 108-0073, Japan, http://www.jsa.or.jp.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from International Organization for Standardization (ISO), ISO
Standards volume information, refer to the standard’s Document Summary page on Central Secretariat, BIBC II, Chemin de Blandonnet 8, CP 401, 1214 Vernier,
the ASTM website. Geneva, Switzerland, http://www.iso.org.
*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
B974/B974M − 16 (2021)
into wrought products, it is not always practical to identify a specific
Specification B249/B249M for rod and bar and Specification
casting analysis with a specific quantity of finished material.
B250/B250M for wire.
6.2 Manufacture:
4. Terminology
6.2.1 The product shall be manufactured by such hot
working, cold working, and annealing processes as to produce
4.1 For definitions of terms related to copper and copper
alloys, refer to Terminology B846. a uniform wrought structure in the finished product.
6.2.2 Theproductshallbehotorcoldworkedtothefinished
5. Ordering Information
size, and subsequently annealed, when required, to meet the
temper properties specified.
5.1 Include the following information in orders for prod-
ucts:
7. Chemical Composition
5.1.1 ASTM designation and year of issue;
7.1 The material shall conform to the chemical composition
5.1.2 Copper UNS No. designation;
requirements in Table 1 for the UNS Number specified in the
5.1.3 Howfurnished(rodorbarinstraightlength,orwirein
ordering information.
coils);
7.1.1 Results of analysis on a product (check) sample shall
5.1.4 Temper;
conform to the composition requirements within the permitted
5.1.5 Cross section (round, hexagonal, square, rectangular);
analytical variance specified in Table 1.
5.1.6 Dimensions: diameter or distance between parallel
surfaces, width and thickness;
7.2 These composition limits do not preclude the presence
5.1.7 How furnished: straight lengths or coils;
of other elements. Limits may be established and analysis
5.1.8 Quantity: total weight or total length, or number of
required for unnamed elements by agreement between the
pieces of each size; and
manufacturer and the purchaser.
5.1.9 If the product is purchased for agencies of the U.S.
7.3 For alloys in which zinc is listed as “remainder,” zinc is
government (see the Supplemental Requirements section of
the difference between the sum of results of all elements
Specifications B249/B249M or B250/B250M for additional
determined and 100 %. When all elements in Table 1 are
requirements, if specified).
determined, the sum of the results shall be 99.5 % min.
5.2 The following options are available and should be
7.4 All chemical composition requirements must be in
specified at the time of placing the order when required:
accordance with the UNS Registered Composition or another
5.2.1 Heat identification or traceability details.
internationally recognized system for alloy designation (“other
5.2.2 Certification.
designation”). It is permissible for applications to have tighter
5.2.3 Mill Test Report.
(more restrictive) limits, but they must be completely within
5.2.4 Automatic screw machine straightness (see 10.4).
the registered UNS (or other designation) Composition. When
5.2.5 Yield strength test required (see 14.2).
different limits outside the registered limits are desired, a new
5.2.6 Resistivity test required (see 10.1).
Registered UNS Composition must be obtained.
5.2.7 Marking of specification number (see 21.2).
NOTE 2—Refer to E527 Standard Practice for Numbering Metals and
6. Materials and Manufacture
Alloys in the Unified Numbering System (UNS) for information on
registering a UNS composition.
6.1 Materials:
6.1.1 ThematerialofmanufactureshallbeaformofCopper
8. Temper
Alloy UNS Nos. C49250, C49260, C49265, C49340, or
8.1 The standard tempers for products described in this
C49345 of such purity and soundness as to be suitable for
specification are given in Table 2.
processing into the products prescribed herein.
8.1.1 Rod (round, hexagonal, and octagonal), and bar shall
6.1.2 In the event heat identification or traceability is
be furnished for general use in O60 temper for maximum
required, the purchaser shall specify the details desired.
formability, and H02 (half-hard) for applications involving
NOTE 1—Due to the discontinuous nature of the processing of castings moderate cold forming.
TABLE 1 Chemical Requirements
Composition, % maximum unless shown as a range or minimum
Copper or Copper Alloy UNS No.
Element
C49250 C49260 C49265 C49340 C49345
A A
Copper 58.0–61.0 58.0–63.0 58.0–62.0 60.0–63.0 60.0–64.0
Zinc Remainder Remainder Remainder Remainder Remainder
Bismuth 1.8–2.4 0.50–1.8 0.50–1.3 0.50–2.2 0.50–1.3
Lead 0.09 0.09 0.09–0.25 0.09 0.09–0.25
Iron 0.50 0.50 0.30 0.12 0.30
Tin 0.30 0.50 0.50 0.50–1.5 0.50–1.5
Cadmium 0.001 0.001 0.001 0.001 0.001
Phosphorus -- 0.05–0.15 0.05–0.12 0.05–0.15 0.05–0.12
Silicon -- 0.10 0.10 0.10 0.10
A
Includes Ag.
B974/B974M − 16 (2021)
TABLE 2 Tensile Requirements, SI
NOTE 1—See Table 3 for inch–pound values.
Yield Strength at 0.5 %
A
Temper Designation Diameter or Distance Tensile Strength, Elongation,
Extension under Load,
min, %
Standard Name Between Parallel Surfaces, mm Min, MPa
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 25
H02 half-hard 12 and under 25 and under 345 170 10
12 and under over 25 to 150, incl. 310 115 15
over 12 to 50, incl. 50 and under 310 115 15
over 12 to 50, incl. over 50 to 150, incl. 275 105 20
over 50 over 50 to 100, incl. 275 105 20
A
In any case, a minimum gage length of 25 mm shall be used. SI elongation values are based on a gage length of 5.65 times the square root of the
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