1、Designation: B974/B974M 10Standard 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 of last revis
2、ion. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification establishes the requirements for free-cutting bismuth brass rod, bar and wire of UNS Alloy No.C49250 and C492
3、60 suitable for high-speed screw machinework, or for general applications.1.2 Typically, product made to this specification is furnishedas straight lengths, or coils when requested.1.3 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard. Thevalues
4、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 thesafety concerns, if any, associated with it
5、s use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B249/B249M Specification for General Requirements forWrought Copper and
6、 Copper-Alloy Rod, Bar, Shapes andForgingsB250/B250M Specification for General Requirements forWrought Copper Alloy WireB846 Terminology for Copper and Copper AlloysE8 Test Methods for Tension Testing of Metallic MaterialsE8M Test Methods for Tension Testing of Metallic Materi-als Metric3E53 Test Me
7、thod for Determination of Copper in UnalloyedCopper by GravimetryE54 Test Methods for ChemicalAnalysis of Special Brassesand Bronzes3E92 Test Method for Vickers Hardness of Metallic Materi-als3E478 Test Methods for ChemicalAnalysis of CopperAlloys2.2 Other Standards:JIS H 1068:2005 Method for Determ
8、ination of Bismuth inCopper and Copper Alloys4ISO 5959-1984 Copper and copper alloys determinationof bismuth content Diethyldithiocarbamate spectromet-ric method53. General Requirements3.1 The following sections of Specification B249/B249Mconstitute a part of this specification:3.1.1 Terminology,3.1
9、.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,3.1.9 Test Reports.3.2 In addition, when a section with a title identical to thatreferenced in 3.1 appears in this specification, it contai
10、nsadditional requirements which supplement those appearing inSpecification B249/B249M.4. Terminology4.1 For definitions of terms related to copper and copperalloys, refer to Terminology B846.5. Ordering Information5.1 Include the following information in orders for prod-ucts:5.1.1 ASTM designation a
11、nd year of issue,5.1.2 Copper UNS No. designation,5.1.3 How furnished (rod or bar in straight length, or wire incoils)5.1.4 Temper,1This specification is under the jurisdiction ofASTM Committee B05 on Copperand Copper Alloys and is the direct responsibility of Subcommittee B05.02 on Rod,Bar, Wire, S
12、hapes and Forgings.Current edition approved Oct. 1, 2010. Published November 2010.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary pag
13、e onthe ASTM website.3Withdrawn. The last approved version of this historical standard is referencedon www.astm.org.4Available from Japanese Industrial Standards through http:/www.JIS.or.jp, orwww.webstore.jsa.or.jp/webstore/JIS/Flowcontrol.JSP.5Available from International Organization of Standards
14、, http:/www.ISO/ISO/store.htm.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.1.5 Cross section (round, hexagonal, square, rectangular),5.1.6 Dimensions; diameter or distance between parallelsurfaces, width and thickness,5.1.7 How
15、furnished: straight lengths or coils,5.1.8 Quantity: total weight or total length, or number ofpieces of each size,5.1.9 If the product is purchased for agencies of the U.S.Government (see the Supplemental Requirements section ofSpecifications B249/B249M or B250/B250M for additionalrequirements, if
16、specified).5.2 The following options are available and should bespecified at the 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 requir
17、ed (see 14.2).5.2.6 Resistivity test required (see 10.1).5.2.7 Marking of specification number (see 21.2).6. Materials and Manufacture6.1 Materials:6.1.1 The material of manufacture shall be a form of CopperAlloy UNS Nos. C49250 or C49260 of such purity andsoundness as to be suitable for processing
18、into the productsprescribed herein.6.1.2 In the event heat identification or traceability isrequired, the purchaser shall specify the details desired.NOTE 1Due to the discontinuous nature of the processing of castingsinto wrought products, it is not always practical to identify a specificcasting ana
19、lysis with a specific quantity of finished material.6.2 Manufacture:6.2.1 The product shall be manufactured by such hot work-ing, cold working, and annealing processes as to produce auniform wrought structure in the finished product.6.2.2 The product shall be hot or cold worked to the finishedsize,
20、and subsequently annealed when required, to meet thetemper properties specified.7. Chemical Composition7.1 The material shall conform to the chemical compositionrequirements in Table 1 for the UNS Number specified in theordering information.7.2 These composition limits do not preclude the presenceof
21、 other elements. Limits may be established and analysisrequired for unnamed elements by agreement between themanufacturer and the purchaser.7.3 For alloys in which zinc is listed as “remainder”, zinc isthe difference between the sum of results of all elementsdetermined and 100%. When all elements in
22、 Table 1 aredetermined, the sum of the results shall be 99.5% min.8. Temper8.1 The standard tempers for products described in thisspecification are given in Table 2.8.1.1 Rod (round, hexagonal, and octagonal), and bar shallbe furnished for general use in O60 temper for maximumformability, and H02 (h
23、alf-hard) for applications involvingmoderate cold forming.9. Mechanical Property Requirements9.1 The product shall conform to the tensile strength andelongation requirements of Tables 2 and 3 when tested inaccordance with Test Methods E8 and E8M.9.2 When specified in the contract or purchase order,
24、theyield strength shall be determined and conform with the yieldstrength requirements of Table 2 when tested in accordancewith Test Methods E8 and E8M.10. Dimensions, Mass, and Permissible Variations10.1 The dimensions and tolerances for rod and materialdescribed by this specification shall be as sp
25、ecified in Specifi-cations B249/B249M or B250/B250M with particular refer-ence to the following tables and related paragraphs in thosespecifications.10.2 Diameter or Distance Between Parallel Surfaces:10.2.1 Rod (Round, Hexagonal, and Octagonal)See 6.2and Table 1 of Specification B249/B249M.10.2.2 B
26、ar (Rectangular and Square)See 6.2 and Tables 7and 10 of Specification B249/B249M.10.2.3 WireSee 6.2 and Table 1 of Specification B250/B250M.10.3 LengthsO60 (soft anneal) and H02 (half hard) tem-per rod and bar, See 6.3 and Tables 13 and 14 of SpecificationB249/B249M.10.4 StraightnessSee 6.4 and Tab
27、le 16 of SpecificationB249/B249M.TABLE 1 Chemical RequirementsElement Composition, %Copper or Copper Alloy UNS No.C49250 C49260Copper (incl silver) 58.0 - 61.0% 58.0 63.0%Zinc Remainder RemainderBismuth 1.8 2.4% 0.50 1.8%Lead 0.09% max 0.09% maxIron 0.50% max 0.50% maxTin 0.30% max 0.50% maxCadmium
28、0.001% max 0.001% maxPhosphorus - 0.05 0.15%Silicon - 0.10% maxCu + sum of named elements, 99.5% min. 99.5% minB974/B974M 10210.4.1 General use straightness tolerances will apply unlessrod is specified for automatic screw machine use at the time ofplacing the order.10.5 Edge ContoursSee 6.5 of Speci
29、fication B249/B249M.TABLE 2 Tensile Requirements, SINOTESee Table 3 for inchpound values.Temper DesignationStandard NameDiameter or DistanceBetween ParallelSurfaces, mmTensile Strength,Min, MPaYield Strength at0.5 % Extensionunder Load, min,MPaElongation,Amin, %Code Name Rod and WireO60 soft anneal
30、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. 380C170 10over 25 to 50, incl. 345 140 15over 50 to 100, incl., and 310 105 20over 100 275 105 20BarThickness, mm Width, mmO60 soft anneal 25 and underover 25150 and unde
31、r150 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, incl. 275 105 20over 50 over 50 to 100, incl. 275 105 20AIn any case, a minimum gage length of
32、 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.BFor product furnished in coils the elongation shall be 4% min.CIf product is specified for thread rolling applications, the minimum tensile strength shal
33、l be 350 MPa.TABLE 3 Tensile Requirements, Inch-PoundNOTESee Table 2 for SI values.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 an
34、d under 48 20 15over 1 to 2, incl.over 2444018152025H02 half-hard12 and under 57 25 7Bover12 to 1, incl. 55C25 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-hard12 an
35、d under 1 and under 50 25 1012 and under over 1 to 6, incl. 45 17 15over12 to 2, incl. 2 and under 45 17 15over12 to 2, incl. over 2 to 6, incl. 40 15 20over 2 over 2 to 4, incl. 40 15 20AIn any case, a minimum gage length of 1 in. shall be used.BFor product furnished in coils the elongation shall b
36、e 4 % min.CIf product is specified for thread rolling applications, the minimum tensile strength shall be 52 ksi.B974/B974M 10311. Workmanship, Finish, and Appearance11.1 The product shall be free of defects, but blemishes of anature that do not interfere with the intended application areacceptable.
37、12. Sampling12.1 Refer to sampling section in Specification B249/B249M for rod and bar, and Specification B250/B250M forwire.13. Number of Tests and Retests13.1 Test:13.1.1 Chemical AnalysisChemical composition shall bedetermined in accordance with the element mean of the resultsfrom at least two re
38、plicate analyses of the sample(s).13.2 Retest:13.2.1 When requested by the manufacturer or supplier, aretest shall be permitted when results of tests obtained by thepurchaser fail to conform to the requirements of the productspecification.13.2.2 The retest shall be as directed in the product speci-f
39、ication for the initial test, except the number of test specimensshall be twice that normally required for the specified test.13.2.3 All test specimens shall conform to the productspecification requirement(s) in retest. Failure to conform shallbe cause for rejection.14. Test Methods14.1 Chemical Ana
40、lysis:14.1.1 In cases of disagreement, the resolution of thedispute shall be subject to agreement between the manufactureror supplier and purchaser. The following methods may be used:Element Test MethodsCopper E478Bismuth JIS H 1068:2005,ISO 5959Cadmium E53Iron E54Tin E478Zinc E478Lead E47814.1.2 Te
41、st method(s) to be followed for the determinationof element(s) resulting from contractual or purchase orderagreement shall be as agreed upon between the manufacturer orsupplier and purchaser.14.2 Other Tests:14.2.1 The product furnished shall conform to specifiedrequirements when subjected to test i
42、n accordance with thefollowing table:Test MethodTensile Properties E8E8M14.2.2 Yield StrengthThe yield strength shall be deter-mined by the 0.5 % extension under load method of TestMethod E8 or E8M. When test results are obtained from bothfull-size and machined specimens, and they differ, the testre
43、sults from the full-size specimens shall prevail.15. Significance of Numbering Limits15.1 For the purpose of determining compliance with thespecified limits for requirements of the properties listed in thefollowing table and for dimensional tolerances, an observedvalue or a calculated value shall be
44、 rounded as indicated inaccordance with the rounding method of Test Method E92:Property Rounded Unit forObserved orCalculated ValueChemical CompositionHardnessNearest unit in thelast right-hand significant digitused in expressingthe limiting valueTensile Strength Nearest ksi5 MPaYield StrengthElonga
45、tion Nearest 1 %16. Inspection16.1 The manufacturer, or supplier, shall inspect and maketests necessary to verify the furnished product conforms tospecification requirements.16.2 Source inspection of the product by the purchaser maybe agreed upon between the manufacturer, or supplier, and thepurchas
46、er as part of the purchase order. In such case, the natureof the facilities needed to satisfy the inspector, representing thepurchaser, that the product is being furnished in accordancewith the specification shall be included in the agreement. Alltesting and inspection shall be conducted so as not t
47、o interfereunnecessarily with the operation of the works.16.3 When mutually agreed upon, the manufacturer, orsupplier, and the purchaser shall conduct the final inspectionsimultaneously.17. Rejection and Rehearing17.1 Rejection:17.1.1 Product that fails to conform to the specificationrequirements wh
48、en tested by the purchaser or purchasers agentshall be subject to rejection.17.1.2 Rejection shall be reported to the manufacturer orsupplier promptly. In addition, a written notification of rejec-tion shall follow.B974/B974M 10417.1.3 In case of dissatisfaction with results of the test uponwhich re
49、jection is based, the manufacturer, or supplier, shallhave the option to make claim for a rehearing.17.2 Rehearing:17.2.1 As a result of product rejection, the manufacturer, orsupplier, shall have the option to make claim for a retest to beconducted by the manufacturer, or supplier, and the purchaser.Samples of the rejected product shall be taken in accordancewith the product specification and subjected to test by bothparties using the test method(s) specified in the productspecification, or alternately, upon agreement of both parties, a
