1、Designation: B974/B974M 12aB974/B974M 16Standard Specification forFree-Cutting Bismuth Brass Rod, Bar and Wire1This standard is issued under the fixed designation B974/B974M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year
2、 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 free-cutting bismuth brass rod, bar and wire of UNS Alloy No.
3、 C49250,C49260 and C49340C49260, C49265, C49340, and C49345 suitable for high-speed screw machine work, or for generalapplications.1.2 Typically, product made to this specification is furnished as straight lengths, or coils when requested.1.3 UnitsThe values stated in either SI units or inch-pound u
4、nits are to be regarded separately as standard. The values statedin each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining valuesfrom the two systems may result in non-conformance with the standard.1.4 This standard does not purport to ad
5、dress all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B249/B249M Spe
6、cification for General Requirements for Wrought Copper and Copper-Alloy Rod, Bar, Shapes and ForgingsB250/B250M Specification for General Requirements for Wrought Copper Alloy WireB846 Terminology for Copper and Copper AlloysE8E8/E8M Test Methods for Tension Testing of Metallic MaterialsE8M Test Met
7、hods for Tension Testing of Metallic Materials Metric (Withdrawn 2008)3E53 Test Method for Determination of Copper in Unalloyed Copper by GravimetryE54 Test Methods for Chemical Analysis of Special Brasses and Bronzes (Withdrawn 2002)3E62 Test Methods for Chemical Analysis of Copper and Copper Alloy
8、s (Photometric Methods) (Withdrawn 2010)3E92 Test Methods for Vickers Hardness and Knoop Hardness of Metallic MaterialsE478 Test Methods for Chemical Analysis of Copper AlloysE527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)2.2 Other Standards:JIS H 1068:2005 Method
9、 for Determination of Bismuth in Copper and Copper Alloys 4ISO 5959-1984 Copper and copper alloys determination of bismuth content Diethyldithiocarbamate spectrometric method53. General Requirements3.1 The following sections of Specification B249/B249M for rod and bar, and B250/B250M for wire consti
10、tute a part of thisspecification:3.1.1 Terminology,1 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.Current edition approved Oct. 1, 2012Oct. 1, 2016. Published
11、 January 2013November 2016. Originally approved in 2010. Last previous edition approved in 2012 asB974/B974M 12.B974/B974M 12a. DOI: 10.1520/B0974_B0974M-12A.10.1520/B0974_B0974M-16.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.or
12、g. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 The last approved version of this historical standard is referenced on www.astm.org.4 Available from Japanese Industrial Standards through http:/www.JIS.or.jp, or www.webstore.j
13、sa.or.jp/webstore/JIS/Flowcontrol.JSP.Standards Association (JSA), MitaMT Bldg., 3-13-12 Mita, Minato-ku, Tokyo 108-0073, Japan, http:/www.jsa.or.jp.5 Available from International Organization of Standards, http:/www.ISO/ISO/store.htm. for Standardization (ISO), ISO Central Secretariat, BIBC II, Che
14、min deBlandonnet 8, CP 401, 1214 Vernier, Geneva, Switzerland, http:/www.iso.org.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequ
15、ately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM I
16、nternational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.1.2 Materials and Manufacture,3.1.3 Sampling,3.1.4 Number of Tests and Retests,3.1.5 Specimen Preparation,3.1.6 Test Methods,3.1.7 Inspection,3.1.8 Certification, and3.1.9 Test Reports.3.2 In addition
17、, when a section with a title identical to that referenced in 3.1 appears in this specification, it contains additionalrequirements which supplement those appearing in Specification B249/B249M. for rod and bar and B250/B250M for wire.4. Terminology4.1 For definitions of terms related to copper and c
18、opper alloys, refer to Terminology B846.5. Ordering Information5.1 Include the following information in orders for products:5.1.1 ASTM designation and year of issue,issue;5.1.2 Copper UNS No. designation,designation;5.1.3 How furnished (rod or bar in straight length, or wire in coils)coils);5.1.4 Te
19、mper,Temper;5.1.5 Cross section (round, hexagonal, square, rectangular),rectangular);5.1.6 Dimensions;Dimensions: diameter or distance between parallel surfaces, width and thickness,thickness;5.1.7 How furnished: straight lengths or coils,coils;5.1.8 Quantity: total weight or total length, or number
20、 of pieces of each size,size; and5.1.9 If the product is purchased for agencies of the U.S. Government (see the Supplemental Requirements section ofSpecifications B249/B249M or B250/B250M for additional requirements, if specified).5.2 The following options are available and should be specified at th
21、e time of placing the order when required:5.2.1 Heat identification or traceability details.5.2.2 Certification.5.2.3 Mill Test Report.5.2.4 Automatic screw machine straightness (see 10.4).5.2.5 Yield strength test required (see 14.2).5.2.6 Resistivity test required (see 10.1).5.2.7 Marking of speci
22、fication number (see 21.2).6. Materials and Manufacture6.1 Materials:6.1.1 The material of manufacture shall be a form of Copper Alloy UNS Nos. C49250, C49260 or C49340C49260, C49265,C49340, or C49345 of such purity and soundness as to be suitable for processing into the products prescribed herein.6
23、.1.2 In the event heat identification or traceability is required, the purchaser shall specify the details desired.NOTE 1Due to the discontinuous nature of the processing of castings into wrought products, it is not always practical to identify a specific castinganalysis with a specific quantity of
24、finished material.6.2 Manufacture:6.2.1 The product shall be manufactured by such hot working, cold working, and annealing processes as to produce a uniformwrought structure in the finished product.6.2.2 The product shall be hot or cold worked to the finished size, and subsequently annealed, when re
25、quired, to meet the temperproperties specified.7. Chemical Composition7.1 The material shall conform to the chemical composition requirements in Table 1 for the UNS Number specified in theordering information.7.1.1 Results of analysis on a product (check) sample shall conform to the composition requ
26、irements within the permittedanalytical variance specified in Table 1.7.2 These composition limits do not preclude the presence of other elements. Limits may be established and analysis requiredfor unnamed elements by agreement between the manufacturer and the purchaser.B974/B974M 1627.3 For alloys
27、in which zinc is listed as “remainder”,“remainder,” zinc is the difference between the sum of results of allelements determined and 100%.100 %. When all elements in Table 1 are determined, the sum of the results shall be 99.5%99.5 %min.7.4 All chemical composition requirements must be in accordance
28、with the UNS Registered Composition or anotherinternationally recognized system for alloy designation (“other designation”). It is permissible for applications to have tighter(more restrictive) limits, but they must be completely within the registered UNS (or other designation) Composition. Whendiff
29、erent limits outside the registered limits are desired, a new Registered UNS Composition must be obtained.NOTE 2Refer to E527 Standard Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS) for information on registeringa UNS composition.8. Temper8.1 The standard tempers for
30、products described in this specification are given in Table 2.8.1.1 Rod (round, hexagonal, and octagonal), and bar shall be furnished for general use in O60 temper for maximumformability, and H02 (half-hard) for applications involving moderate cold forming.9. Mechanical Property Requirements9.1 The
31、product shall conform to the tensile strength and elongation requirements of Tables 2 and 3 when tested in accordancewith Test Methods E8E8/E8M and E8M.9.2 When specified in the contract or purchase order, the yield strength shall be determined and conform with the yield strengthrequirements of Tabl
32、e 2 when tested in accordance with Test Methods E8E8/E8M and E8M.10. Dimensions, Mass, and Permissible Variations10.1 The dimensions and tolerances for rod and material described by this specification shall be as specified in SpecificationsB249/B249M or B250/B250M with particular reference to the fo
33、llowing tables and related paragraphs in those specifications.10.2 Diameter or Distance Between Parallel Surfaces:10.2.1 Rod (Round, Hexagonal, and Octagonal)See 6.2 and Table 1 of Specification B249/B249M.10.2.2 Bar (Rectangular and Square)See 6.2 and Tables 7 and 10 of Specification B249/B249M.10.
34、2.3 WireSee 6.2 and Table 1 of Specification B250/B250M.10.3 LengthsO60 (soft anneal) and H02 (half hard) temper rod and bar, See 6.3 and Tables 13 and 14 of SpecificationB249/B249M.TABLE 1 Chemical RequirementsElement Composition, % maximum unless shown as a range or minimumCopper or Copper Alloy U
35、NS No.C49250 C49260 C49340Copper 58.0 - 61.0 58.0 63.0 60.063.0Zinc Remainder Remainder RemainderBismuth 1.8 2.4 0.50 1.8 0.502.2Lead 0.09 0.09 0.09Iron 0.50 0.50 0.12Tin 0.30 0.50 0.501.5Cadmium 0.001 0.001 0.001Phosphorus - 0.05 0.15 0.050.15Silicon - 0.10 0.10TABLE 1 Chemical RequirementsElementC
36、omposition, % maximum unless shown as a range or minimumCopper or Copper Alloy UNS No.C49250 C49260 C49265 C49340 C49345Copper 58.061.0 58.063.0 58.062.0A 60.063.0 60.064.0AZinc Remainder Remainder Remainder Remainder RemainderBismuth 1.82.4 0.501.8 0.501.3 0.502.2 0.501.3Lead 0.09 0.09 0.090.25 0.0
37、9 0.090.25Iron 0.50 0.50 0.30 0.12 0.30Tin 0.30 0.50 0.50 0.501.5 0.501.5Cadmium 0.001 0.001 0.001 0.001 0.001Phosphorus - 0.050.15 0.050.12 0.050.15 0.050.12Silicon - 0.10 0.10 0.10 0.10A Includes Ag.B974/B974M 163TABLE 2 Tensile Requirements, SINOTE 1See Table 3 for inchpound values.Temper Designa
38、tionStandard NameDiameter or DistanceBetween Parallel Surfaces, mmTensile Strength,Min, MPaYield Strength at 0.5 %Extension under Load,min, MPaElongation,Amin, %Code Name Rod and WireTemper DesignationStandard NameDiameter or DistanceBetween ParallelSurfaces, mmTensile Strength,Min, MPaYield Strengt
39、h at0.5 % Extensionunder Load, min,MPaElongation,Amin, %Code Name Rod and WireO60 soft anneal 25 and under 330 140 15over 25 to 50, incl. 305 125 20over 50 275 105 25H02 half-hard 12 and under 395 170 7Bover 12 to 25, incl. 380C 170 10over 25 to 50, incl. 345 140 15over 50 to 100, incl., and 310 105
40、 20over 100 275 105 20BarThickness, mm Width, mmO60 soft anneal 25 and underover 25150 and under150 and under3052751251052025H02 half-hard 12 and under 25 and under 345 170 1012 and under over 25 to 150, incl. 310 115 15over 12 to 50, incl. 50 and under 310 115 15over 12 to 50, incl. over 50 to 150,
41、 incl. 275 105 20over 50 over 50 to 100, incl. 275 105 20A 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 area for dimensionsgreater than 2.5 mm.B For product furnished in coils the elongation shall be 4
42、%4 % min.C If product is specified for thread rolling applications, the minimum tensile strength shall be 350 MPa.TABLE 3 Tensile Requirements, Inch-PoundNOTE 1See Table 2 for SI values.Temper DesignationStandard NameDiameter or DistanceBetween Parallel Surfaces, in.Tensile Strength,min, ksiYield St
43、rength at 0.5 %Extension under Load,min, ksiElongation,Amin, %Temper DesignationStandard NameDiameter or DistanceBetween ParallelSurfaces, in.Tensile Strength,min, ksiYield Strength at 0.5 %Extension under Load,min, ksiElongation,Amin, %Code Name Rod and WireO60 soft anneal 1 and under 48 20 15over
44、1 to 2, incl.over 2444018152025H02 half-hard 12 and under 57 25 7Bover 12 to 1, incl. 55C 25 10over 1 to 2, incl. 50 20 15over 2 to 4, incl., and 45 15 20over 4 40 15 20BarThickness, in. Width, in.O60 soft anneal 1 and underover 16 and under6 and under444018152025H02 half-hard 12 and under 1 and und
45、er 50 25 1012 and under over 1 to 6, incl. 45 17 15over 12 to 2, incl. 2 and under 45 17 15over 12 to 2, incl. over 2 to 6, incl. 40 15 20over 2 over 2 to 4, incl. 40 15 20A 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 I
46、f product is specified for thread rolling applications, the minimum tensile strength shall be 52 ksi.B974/B974M 16410.4 StraightnessSee 6.4 and Table 16 of Specification B249/B249M.10.4.1 General use straightness tolerances will apply unless rod is specified for automatic screw machine use at the ti
47、me ofplacing the order.10.5 Edge ContoursSee 6.5 of Specification B249/B249M.11. Workmanship, Finish, and Appearance11.1 The product shall be free of defects, but blemishes of a nature that do not interfere with the intended application areacceptable.12. Sampling12.1 Refer to sampling section in Spe
48、cification B249/B249M for rod and bar, and Specification B250/B250M for wire.13. Number of Tests and Retests13.1 Test:13.1.1 Chemical AnalysisChemical composition shall be determined in accordance with the element mean of the results fromat least two replicate analyses of the sample(s).13.2 Retest:1
49、3.2.1 When requested by the manufacturer or supplier, a retest shall be permitted when results of tests obtained by thepurchaser fail to conform to the requirements of the product specification.13.2.2 The retest shall be as directed in the product specification for the initial test, except the number of test specimens shallbe twice that normally required for the specified test.13.2.3 All test specimens shall conform to the product specification requirement(s) in retest. Failure to conform shall be causefor reject
