1、Designation: B981/B981M 12Standard Specification forLow Leaded Brass Rod, Bar and Shapes1This standard is issued under the fixed designation B981/B981M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last revision. A n
2、umber 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 lowleaded brass rod, bar, wire, and shapes of any specified crosssection produced fr
3、om Copper Alloys UNS No. C36300,C36500, C37000, C37100 and C37700 suitable for high-speedscrew machining applications.NOTE 1Refer to Specification B124/B124M when purchasing bar orrod for forging production.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as
4、standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.3 This standard does not purport to address all of thesafety concerns, if any,
5、 associated with its 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:2B124/B124M Specification for Copper and Copper Alloy
6、Forging Rod, Bar, and ShapesB249/B249M Specification for General Requirements forWrought Copper and Copper-Alloy Rod, Bar, Shapes andForgingsB250/B250M Specification for General Requirements forWrought Copper Alloy WireB601 Classification for Temper Designations for Copperand Copper AlloysWrought an
7、d CastE8/E8M Test Methods for Tension Testing of MetallicMaterials3. General Requirements3.1 The following sections of Specifications B249/B249M(rod, bar, and shapes) and B250/B250M (wrought copper alloywire) constitute a part of this specification.3.1.1 Terminology,3.1.2 Materials and Manufacture,3
8、.1.3 Workmanship, Finish, and Appearance,3.1.4 Sampling,3.1.5 Number of Tests and Retest,3.1.6 Specimen Preparation,3.1.7 Test Methods,3.1.8 Significance of Numerical Limits,3.1.9 Inspection,3.1.10 Rejection and Rehearing,3.1.11 Certification,3.1.12 Mill Test Report,3.1.13 Packaging and Package Mark
9、ing, and3.1.14 Supplementary Requirements.3.2 In addition, when a section with a title identical to thosereferenced in 3.1 appears in this specification, it containsadditional requirements that supplement those appearing inSpecifications B249/B249M and B250/B250M.4. Ordering Information4.1 Include t
10、he following information when placing ordersfor product under this specification, as applicable:4.1.1 ASTM specification designation and year of issue(Bxxx/BxxxM XX).4.1.2 Copper Alloy UNS No. designations (C36300,C36500, C37000, C37100 and C37700, see Section 6 andTable 1.4.1.3 Temper (see Section
11、7 and Table 2 and Table 3).4.1.4 Product cross section form (for example, round, hex-agonal, square, etc.).1This test method is under the jurisdiction of ASTM Committee B05 on Copperand Copper Alloys and is the direct responsibility of Subcommittee B05.02 on Rod,Bar, Wire, Shapes and Forgings.Curren
12、t edition approved April 1, 2012. Published May 2012. DOI: 10.1520/B0981_B0981M-12.2For 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 pa
13、ge onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.1.5 Dimensions (see Section 9).4.1.6 How furnished: straight lengths or coils (see 5.2).4.1.7 Edge contours (see Section 9).4.1.8 Quantity; total weight, footage
14、, or number of piecesfor each size.4.2 The following options are available and shall be speci-fied at the time of placing the order when required:4.2.1 Tensile test requirement for product12 in. 12 mmand over (see 8.2).4.2.2 Certification (refer to Specifications B249/B249M orB250/B250M).4.2.3 Mill
15、Test Report (refer to Specifications B249/B249Mor B250/B250M).4.2.4 When product is purchased for agencies of the U.S.Government see Section 11.5. Materials and Manufacture5.1 MaterialThe material of manufacture shall be a castbillet of Copper Alloys UNS No. C36300, C36500, C37000,C37100 and C37700
16、and of such purity and soundness as to besuitable for hot extrusion into rod, bar, wire, and shapedproducts.5.1.1 In the event that heat identification or traceability isrequired, the purchaser shall specify the details desired.NOTE 2Due to the discontinuous nature of the processing of castingsinto
17、wrought products, it is not always practical to identify a specificcasting analysis with a specific quantity of finished material.5.2 ManufactureProduct produced under this specifica-tion shall be in straight lengths; however, it shall be furnishedin coils when so specified in the contract or purcha
18、se order (see4.1.6).TABLE 1 Chemical RequirementsComposition (%)CopperAlloyUNS No.Copper Lead Phosphorus Iron Max. Tin Max. ZincCopper PlusElements withSpecific LimitsPresent, minC36300 61.0 63.0 0.25 0.7 0.04 0.15 0.15 remainder 99.5C36500 58.0 61.0 0.25 0.7 0.15 remainder 99.6C37000 59.0 62.0 0.8
19、1.5 0.15 remainder 99.6C37100 58.0 62.0 0.6 1.2 0.15 remainder 99.6C37700 58.0 61.0 1.5 2.5 0.30 remainder 99.5TABLE 2 Tensile Requirements, inch-poundNOTESee Table 3 for SI values.Temper DesignationCode NameDiameter orDistanceBetweenParallelSurfaces, in.Tensile Strength, min, ksiYield Strengthat 0.
20、5 %Extensionunder Load,min, ksiElongation,Amin, %Rod, Bar, ShapesH02 Half-hard12 and under 63 28 10Bover 1/2 to 1, incl. 55 26 12over 1 to 2, incl. 48 24 20over 2 45 20 25AIn any case, a minimum gauge length of 1 in. shall be used.BFor product furnished in coils the elongation shall be4%minimum.TABL
21、E 3 Tensile Requirements, SINOTESee Table 2 for inch-pound values.Temper DesignationCode NameDiameter orDistanceBetweenParallelSurfaces, mmTensile Strength, min, MPaYield Strengthat 0.5 %Extensionunder Load,min, MPaElongation,Amin, %Rod, Bar, ShapesH02 Half-hard 12 and under 430 190 10Bover 12 to 25
22、, incl. 380 180 12over 25 to 50, incl. 330 165 20over 50 310 135 25AIn any case, a minimum gauge 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.BFor product furnished in coils the elongation s
23、hall be4%minimum.B981/B981M 1226. Chemical Composition6.1 The product shall conform to the chemical composi-tional requirements specified in Table 1 for Copper AlloysUNS No. C36300, C36500, C37000, C37100 and C37700.6.2 The UNS designated composition limits do not precludethe possible presence of ot
24、her unnamed elements; however,analysis shall be made regularly only for the minor elementslisted in Table 1, plus either copper or zinc, or plus all majorelements except one. The major element that is not analyzedshall be determined by difference between the sum of thoseelements analyzed and 100 %.
25、By agreement between produceror supplier and purchaser, analysis may be required and limitsestablished for the elements not cited. Percentage content ofelements shown as “remainder” (rem.) is calculated by differ-ence.7. Temper7.1 Tempers, as defined in Practice B601, identified in Table2 and Table
26、3 for products produced under this specification,are as follows:7.1.1 H02 (half hard).7.2 Rod and bar shall be furnished in the H02 (half hard)temper.8. Mechanical Properties8.1 Tensile Requirements:8.1.1 When tensile requirements are specified, the productshall conform to the requirements given in
27、Table 2 and Table 3for temper, size, and form.8.1.1.1 Tensile requirements shall be the acceptance criteriaof mechanical properties for product under12 in. 12 mm indiameter or distance between parallel surfaces when tested inaccordance with Test Methods E8/E8M.8.1.1.2 When specified in the ordering
28、information, tensilerequirements shall be the acceptance criteria based uponmechanical properties for product12 in. 12 mm, or greater indiameter or distance between parallel planes when tested inaccordance with Test Methods E8/E8M.8.2 Wire and ShapesMechanical property requirementsfor wire and shape
29、s shall be subject to agreement between themanufacturer and the purchaser and the agreement shall be partof that contract or purchase order.9. Dimensions, Mass, and Permissible Variations9.1 The dimensions and tolerances for bar, rod and shapesproduced under this specification shall be as specified
30、in thefollowing tables and paragraphs in Specification B249/B249M.9.1.1 Diameter or Distance Between Parallel Surfaces:9.1.1.1 Rod in LengthSee Table 2.9.1.1.2 Bar, Rectangular and SquareSee Tables 9 and 11.9.1.2 ShapesDimensional tolerances shall be subject toagreement between the manufacturer and
31、the purchaser and theagreement shall be part of the contract or purchase order.9.1.3 Length:9.1.3.1 Rod, Bar, and ShapesSee Tables 13 and 14.9.1.4 Edge ContoursRefer to the subsection titled “EdgeContours” and Figs. 1, 2, and 3.9.2 The dimensions and tolerances for wire product underthis specificati
32、on shall be as specified in Table 1 and the relatedsection in Specification B250/B250M.9.2.1 Wire, Coiled, RoundSee Table 1.10. Test Methods10.1 Chemical AnalysisChemical composition shall, incase of disagreement, be determined subject to agreementbetween the manufacturer and the purchaser.10.2 Test
33、 method(s) to be followed for the determination ofother element(s) resulting from contractual or purchaser orderagreement shall be as agreed upon between the manufacturerand the purchaser.11. Purchases for U.S. Government Agencies11.1 Product purchased for agencies of the U.S. Govern-ment, when spec
34、ified in the contract or purchase order, shallconform to the special Supplementary Requirements section inSpecifications B249/B249M (rod, bar, and shapes) and B250/B250M (wire).12. Keywords12.1 bar; CopperAlloy UNS No. C36300, C36500, C37000,C37100 and C37700; low leaded; rod; shapes; wireASTM Inter
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36、their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand shou
37、ld be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Stan
38、dards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).B981/B981M 123
