1、Designation:B42709(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 number in pa
2、rentheses 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 alloyswhose coppe
3、r 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 mathematicalconversions to SI units
4、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 for CopperAlloy Casting
5、sB846 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 for Numbering Metals a
6、nd 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 Preparation3.1.6 Certification3.1.7
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 copper and copperalloys,refe
8、r 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 Pattern or drawing number and cas
9、ting 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 purchase order(Specification B824).5.2
10、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 Table 2 forthe alloy specified.6.2 These s
11、pecification 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 onCastings and Ingots for Remelting.Current ed
12、ition 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 standard designation system accomplished by the additio
13、nof 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 Book of ASTMStandards volume information,refer to the standar
14、ds 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 States1 between manufacturer or supplier and purchaser for theseunnamed elements.Copper m
15、ay 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 Requirements7.1 Mechanical properties shall be determined from sepa-rately c
16、ast 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 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
