1、Designation: B427 09 (Reapproved 2015)Standard Specification forGear Bronze Alloy Castings1This standard is issued under the fixed designation B427; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A numbe
2、r in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope*1.1 This specification2establishes requirements for alloy
3、swhose copper alloy numbers and nominal compositions areshown in Table 1. The castings may be furnished as one ofthree types: static chill, centrifugal chill, or sand cast.1.2 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconvers
4、ions to SI units that are provided for information onlyand are not considered standard.2. Referenced Documents2.1 ASTM Standards:3B208 Practice for Preparing Tension Test Specimens forCopper Alloy Sand, Permanent Mold, Centrifugal, andContinuous CastingsB824 Specification for General Requirements fo
5、r CopperAlloy CastingsB846 Terminology for Copper and Copper AlloysB950 Guide for Editorial Procedures and Form of ProductSpecifications for Copper and Copper AlloysE8/E8M Test Methods for Tension Testing of Metallic Ma-terialsE10 Test Method for Brinell Hardness of Metallic MaterialsE527 Practice f
6、or Numbering Metals and Alloys in theUnified Numbering System (UNS)3. General Requirements3.1 The following sections of Specification B824 constitutea part of this specification.3.1.1 Terminology3.1.2 Materials and Manufacture3.1.3 Sampling3.1.4 Number of Tests and Retests3.1.5 Specimen Preparation3
7、.1.6 Certification3.1.7 Test Reports3.2 In addition, when a section with a title identical to thatreferenced in 3.1, above, appears in this specification, itcontains additional requirements which supplement those ap-pearing in Specification B846.4. Terminology4.1 For definitions of terms related to
8、copper and copperalloys, refer to Terminology B846.5. Ordering Information5.1 Include the following information when placing ordersfor product under this specification:5.1.1 Quantity of castings required,5.1.2 Copper Alloy UNS No. (Table 1),5.1.3 Specification title, number, and year of issue,5.1.4
9、Pattern or drawing number and casting type (Section1),5.1.5 Repair of castings (Section 9),5.1.6 Certification, if specified in the purchase order (Speci-fication B824),5.1.7 Foundry test report, if specified in the purchase order(Specification B824), and5.1.8 Witness inspection, if specified in the
10、 purchase order(Specification B824).5.2 When product is purchased for agencies of the U.S.Government, the Supplementary Requirements of Specifica-tion B824 may be specified.6. Chemical Composition6.1 The castings shall conform to the requirements as tochemical composition requirements prescribed in
11、Table 2 forthe alloy specified.6.2 These specification limits do not preclude the presenceof other elements. Limits may be established by agreement1This specification is under the jurisdiction ofASTM Committee B05 on Copperand Copper Alloys and is the direct responsibility of Subcommittee B05.05 onC
12、astings and Ingots for Remelting.Current edition approved May 1, 2015. Published June 2015. Originallyapproved in 1965. Last previous edition approved in 2009 as B427 09. DOI:10.1520/B0427-09R15.2The UNS system for copper and copper alloys (see Practice E527) is a simpleexpansion of the former stand
13、ard designation system accomplished by the additionof a prefix “C” and a suffix “00.” The suffix can be used to accommodatecomposition variations of the base alloy.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Boo
14、k of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1between manufactur
15、er or supplier and purchaser for theseunnamed elements. Copper may be given as remainder andmay be taken as the difference between the sum of all elementsanalyzed and 100 %. When all the named elements in Table 2are analyzed, their sum shall be as specified in Table 3.7. Mechanical Property Requirem
16、ents7.1 Mechanical properties shall be determined from sepa-rately cast test bar castings and shall meet the requirementsshown in Table 4.8. Dimensions, Mass, and Permissible Variations8.1 Variations in dimensions and weights shall be as agreedupon between the producer and the consumer but shall not
17、 bemore than 3 % in the as-cast condition.8.2 The manufacturer shall not be responsible for thedimensional accuracy of patterns or molds furnished by thepurchaser.9. Casting Repair9.1 The castings shall not be repaired, plugged, welded, orburned-in without the written approval of the purchaser.10. S
18、ampling10.1 Test bar casting representing sand castings in theCopperAlloy UNS Nos. under this specification shall be cast tothe form and dimensions shown in Figs. 2, Figs. 3, or Figs. 4of Practice B208.10.2 Test bar castings representing castings produced inchill molds of metal or graphite may be ca
19、st in open keel-blockmolds of the same material as the molds used for the castings.10.3 Separate centrifugally cast test bars shall be made inaccordance with Practice B208.10.4 At the manufacturers option test bar specimens maybe removed from centrifugal castings instead of separatecentrifugally cas
20、t test coupons (10.3).11. Number of Tests11.1 One Brinell hardness reading shall be made for each lotof castings.12. Test Methods12.1 Brinell readings shall be taken on the grip end of thetension test bar, at or within 1 in. (25.4 mm) of the castingoutside diameter, or as indicated on the purchasers
21、 drawingand shall be made in accordance with Test Method E10.13. Certification13.1 In the case of a product manufactured in advance andsupplied for sale from stock by the manufacturer, jobber orother dealer, the product may upon request of the purchaser becertified by the manufacturer as conforming
22、to this specifica-tion subject to the following procedure. Not less than twotension tests, and two hardness tests, from different heats, andnot less than one chemical analysis shall be made by themanufacturer from each days melt. Records of the tension testresults, hardness, and chemical analysis sh
23、all be systematicallymade and maintained and shall be the basis for certification. Inlieu of the manufacturers certification and upon writtenrequest by the purchaser, these records may be examined on themanufacturers premises by the purchaser or his accreditedrepresentative.14. Keywords14.1 bronze c
24、astings; copper-base castings; gear bronze;gear castingsTABLE 1 Nominal CompositionCopperAlloyUNS No.PreviouslyUsedDesignationComposition, %Copper Tin Nickel LeadPhos-phorusC90800 A 87.8 12.0 . 0 0.2C91700 B 86.3 12.0 1.5 0 0.2C90700 . 87.8 11.0 . 0 0.2C91600 C 88.0 10.3 1.5 0 0.2C92900 D 83.5 10.0
25、3.5 2.8 0.2B427 09 (2015)2APPENDIX(Nonmandatory Information)X1. METRIC EQUIVALENTSX1.1 The SI unit for strength properties now shown is inaccordance with the International System of Units (SI). Thederived SI unit for force is the newton (N), which is defined asthat force which when applied to a body
26、 having a mass of onekilogram gives it an acceleration of one metre per secondsquared (N = kgm s2). The derived SI unit for pressure orstress is the newton per square metre (N/m2), which has beennamed the pascal (Pa) by the General Conference on Weightsand Measures. Since 1 ksi = 6 894 757 Pa the me
27、tric equiva-lents are expressed as megapascal (MPa), which is the same asMN/m2and N/mm2.TABLE 2 Chemical RequirementsElementComposition, max % (Unless Shown as a Range or Minimum) Copper Alloy UNS No.C90800AC91700AC90700AC91600AC92900ACopper 85.089.0B84.087.0B88.090.0B86.089.0B82.086.0BTin 11.013.0
28、11.312.5 10.012.0 9.710.8 9.011.0Lead 0.25 0.25 0.50 0.25 2.03.2Zinc 0.25 0.25 0.50 0.25 0.25Iron 0.15 0.20 0.15 0.20 0.20Antimony 0.20 0.20 0.20 0.20 0.25Nickel (incl. cobalt) 0.50 1.22.0 0.50 1.22.0 2.84.0Sulfur 0.05 0.05 0.05 0.05 0.05Phosphorus 0.30 0.30 0.30 0.30 0.50Aluminum 0.005 0.005 0.005
29、0.005 0.005Silicon 0.005 0.005 0.005 0.005 0.005AIngot for remelting specifications vary from the ranges shown.BIn determining Cu min., Cu may be calculated as Cu + Ni.TABLE 3 Copper Plus Sum of All Named Elements AnalyzedCopper AlloyUNS No.Copper Plus NamedElements, % minC90800 99.4C91700 99.4C9070
30、0 99.4C91600 99.4C92900 99.3TABLE 4 Mechanical RequirementsANOTE 1The properties of a separate cast test specimen shall meet the following minimum values:Copper Alloy UNS Nos. C90700,C90800, C91700Copper Alloy UNS No.C91600Copper Alloy UNS Nos.C90700, C90800, C91600,C91700Copper Alloy UNS No.C92900S
31、tatic or Centrifugally Chill Cast,ksiB(MPa)CStatic or Centrifugally ChillCast, ksiB(MPa)CSand Cast,ksiB(MPa)CSand or Chill Cast,ksiB(MPa)CTensile strength, min 50 (345) 45 (310) 35 (241) 45 (310)Yield strength, at 0.5 % extension, min 28 (193) 25 (172) 17 (117) 25 (172)Elongation in 2 in. (50.8 mm),
32、 min, % 12 10 10 8Brinell-500 kg on bar or casting, min 95 85 65 75ATest taken in accordance with Test Methods E8/E8M.Bksi = 1000 psi.CSee Appendix X1.B427 09 (2015)3SUMMARY OF CHANGESCommittee B05 has identified the principal changes to this specification that have been incorporated since the2002 i
33、ssue as follows:(1) General editorial modifications were made to incorporatecurrent practices of form and style and in conformance withGuide B950.(2) A Terminology Section was added.(3) A more detailed General Requirements Section was added.(4) Clarifications to Table 2, Chemical Composition, werema
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38、ss 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 Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 09 (2015)4
