1、Designation: B974/B974M 12 B974/B974M 12aStandard 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 ye
2、ar 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 N
3、o. C49250,C49260 and C49340 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 UnitsThe values stated in either SI units or inch-pound units are to be regarded separat
4、ely 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 address all of the safety concern
5、s, 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 Specification for General Requirem
6、ents 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 AlloysE8 Test Methods for Tension Testing of Metallic MaterialsE8M Test Methods for Tension Testing of Metallic
7、Materials Metric (Withdrawn 2008)3E53 Test Method for Determination of Copper in Unalloyed Copper by GravimetryE54 Test Methods for Chemical Analysis of Special Brasses and Bronzes (Withdrawn 2002)3E62 Test Methods for Chemical Analysis of Copper and Copper Alloys (Photometric Methods) (Withdrawn 20
8、10)3E92 Test Method for Vickers Hardness of Metallic Materials (Withdrawn 2010)3E478 Test Methods for Chemical Analysis of Copper Alloys2.2 Other Standards:JIS H 1068:2005 Method for Determination of Bismuth in Copper and Copper Alloys 4ISO 5959-1984 Copper and copper alloys determination of bismuth
9、 content Diethyldithiocarbamate spectrometric method53. General Requirements3.1 The following sections of Specification B249/B249M constitute a part of this specification:3.1.1 Terminology,3.1.2 Materials and Manufacture,3.1.3 Sampling,3.1.4 Number of Tests and Retests,3.1.5 Specimen Preparation,3.1
10、.6 Test Methods,1 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 April 1, 2012Oct. 1, 2012. Published May 2012January 2013. Originall
11、y approved in 2010. Last previous edition approved in 20102012 asB974/B974M 10.B974/B974M 12. DOI: 10.1520/B0974_B0974M-12.10.1520/B0974_B0974M-12A.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Stan
12、dardsvolume 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.jsa.or.jp/webstore/JIS/Flowcontr
13、ol.JSP.5 Available from International Organization of Standards, http:/www.ISO/ISO/store.htm.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 possi
14、ble to adequately 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 standardCopy
15、right ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.1.7 Inspection,3.1.8 Certification,3.1.9 Test Reports.3.2 In addition, when a section with a title identical to that referenced in 3.1 appears in this specification, it contains additional
16、requirements which supplement those appearing in Specification B249/B249M.4. Terminology4.1 For definitions of terms related to copper and copper 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 i
17、ssue,5.1.2 Copper UNS No. designation,5.1.3 How furnished (rod or bar in straight length, or wire in coils)5.1.4 Temper,5.1.5 Cross section (round, hexagonal, square, rectangular),5.1.6 Dimensions; diameter or distance between parallel surfaces, width and thickness,5.1.7 How furnished: straight leng
18、ths or coils,5.1.8 Quantity: total weight or total length, or number of pieces 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 additional requirements, if specified).5.2 The fo
19、llowing options are available and should be specified 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 required (see 14.2).5.2.6
20、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 Copper Alloy UNS Nos. C49250, C49260 or C49340 of such purity andsoundness as to be suitable for processing into the pr
21、oducts prescribed herein.6.1.2 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 wi
22、th a specific quantity of 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 subs
23、equently annealed when required, 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.7.2 These composition limits do not preclude the presence of other
24、 elements. Limits may be established and analysis requiredfor unnamed elements by agreement between the manufacturer and the purchaser.7.3 For alloys in which zinc is listed as “remainder”, zinc is the difference between the sum of results of all elements determinedand 100%. When all elements in Tab
25、le 1 are determined, the sum of the results shall be 99.5% min.8. Temper8.1 The standard tempers for 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 (ha
26、lf-hard) for applications involving moderate cold forming.B974/B974M 12a29. Mechanical Property Requirements9.1 The product shall conform to the tensile strength and elongation requirements of Tables 2 and 3 when tested in accordancewith Test Methods E8 and E8M.9.2 When specified in the contract or
27、purchase order, the yield strength shall be determined and conform with the yield strengthrequirements of Table 2 when tested in accordance with Test Methods E8 and E8M.10. Dimensions, Mass, and Permissible Variations10.1 The dimensions and tolerances for rod and material described by this specifica
28、tion shall be as specified in SpecificationsB249/B249M or B250/B250M with particular reference to the following 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 B
29、249/B249M.10.2.2 Bar (Rectangular and Square)See 6.2 and Tables 7 and 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) temper rod and bar, See 6.3 and Tables 13 and 14 of SpecificationB249/B249M.TABLE 1 Chemic
30、al RequirementsElement Composition, % maximum unless shown as a range or minimumCopper or Copper Alloy UNS 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 0.502.0Bismuth 1.8 2.4 0.50 1.8 0.502.2Lead 0.09 0.09 0.09Iron 0.50 0.50 0
31、.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 2 Tensile Requirements, SINOTE 1See Table 3 for inchpound values.Temper DesignationStandard NameDiameter or DistanceBetween ParallelSurfaces, mmTensile Strength,Min, MPaYield Strength at0.5 % Ext
32、ensionunder 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 20over 100 2
33、75 105 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, incl. 275 10
34、5 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% min.C If pr
35、oduct is specified for thread rolling applications, the minimum tensile strength shall be 350 MPa.B974/B974M 12a310.4 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 time
36、 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 Speci
37、fication 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:13.
38、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
39、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 rejection.14. Test Methods14.1 Chemical Analysis:14.1.1 In cases of disagreement, the reso
40、lution of the dispute shall be subject to agreement between the manufacturer or supplierand purchaser. The following methods may be used:Element Test MethodsTABLE 3 Tensile Requirements, Inch-PoundNOTE 1See Table 2 for SI values.Temper DesignationStandard NameDiameter or DistanceBetween ParallelSurf
41、aces, 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 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
42、, 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 under 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
43、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 If product is specified for thread rolling applications, the minimum tensile strength shall be 52 ksi.B974/B974M 12a4Bismuth JIS H 106
44、8:2005,ISO 5959Cadmium E53Copper E478Iron E54Lead E478Phosphorus E62Silicon E54Tin E478Zinc E47814.1.2 Test method(s) to be followed for the determination of element(s) resulting from contractual or purchase order agreementshall be as agreed upon between the manufacturer or supplier and purchaser.14
45、.2 Other Tests:14.2.1 The product furnished shall conform to specified requirements when subjected to test in accordance with the followingtable:B974/B974M 12a5Test MethodTensile Properties E8E8M14.2.2 Yield StrengthThe yield strength shall be determined by the 0.5 % extension under load method of T
46、est Method E8 orE8M. When test results are obtained from both full-size and machined specimens, and they differ, the test results from the full-sizespecimens shall prevail.15. Significance of Numbering Limits15.1 For the purpose of determining compliance with the specified limits for requirements of
47、 the properties listed in thefollowing table and for dimensional tolerances, an observed value or a calculated value shall be rounded as indicated in accordancewith the rounding method of Test Method E92:Property Rounded Unit forObserved orCalculated ValueChemical CompositionHardnessNearest unit in
48、thelast right-hand significant digitused in expressingthe limiting valueTensile Strength Nearest ksi5 MPaYield StrengthElongation Nearest 1 %16. Inspection16.1 The manufacturer, or supplier, shall inspect and make tests necessary to verify the furnished product conforms tospecification requirements.
49、16.2 Source inspection of the product by the purchaser may be agreed upon between the manufacturer, or supplier, and thepurchaser as part of the purchase order. In such case, the nature of the facilities needed to satisfy the inspector, representing thepurchaser, that the product is being furnished in accordance with the specification shall be included in the agreement. All testingand inspection shall be conducted so as not to interfere unnecessarily with the operation of the works.16.3 When mutually agreed upon, the manu
