1、Designation:F79911Standard Specification forCobalt-28Chromium-6Molybdenum Alloy Forgings forSurgical Implants(UNS R31537,R31538,R31539)1This standard is issued under the fixed designation F799;the number immediately following the designation indicates the year of originaladoption or,in the case of r
2、evision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification covers requirements of cobalt-28chromium-6molybdenum alloy(UNS R31537,R31538,R31539)h
3、igh-strength forgings for the manufacture of surgicalimplants.The properties specified in this document specificallyapply to finished or semifinished parts that receive no subse-quent thermomechanical processing.1.2 Wrought material to be used as forging stock in themanufacture of forgings conformin
4、g to this specification,typically hot worked and unannealed with a surface finishsuitable for forging,shall be fabricated and supplied inaccordance with F1537.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not
5、 be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.2.Referenced Documents2.1 ASTM Standards:2E8 Test Methods for Tension Testing of Metallic MaterialsE18 Test Methods for Rockwell Har
6、dness of Metallic Ma-terialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE112 Test Methods for Determining Average Grain SizeE165 Practice for Liquid Penetrant Examination for GeneralIndustryE930 Test Methods for Estimating the Largest Grain Ob-se
7、rved in a Metallographic Section(ALA Grain Size)F75 Specification for Cobalt-28 Chromium-6 MolybdenumAlloy Castings and Casting Alloy for Surgical Implants(UNS R30075)F601 Practice for Fluorescent Penetrant Inspection of Me-tallic Surgical ImplantsF981 Practice for Assessment of Compatibility of Bio
8、mate-rials for Surgical Implants with Respect to Effect ofMaterials on Muscle and BoneF1537 Specification for Wrought Cobalt-28Chromium-6Molybdenum Alloys for Surgical Implants(UNSR31537,UNS R31538,and UNS R31539)ASTM SI 10 American National Standard for Use of theInternational System of Units(SI):T
9、he Modern MetricSystem2.2 ISO Standards:3ISO 6892 Metallic MaterialsTensile Testing at AmbientTemperatureISO 9001 Quality Management SystemsRequirements2.3 American Society for Quality Standard:4ASQ C1 Specification of General Requirements for a Qual-ity Program3.Terminology3.1 Definitions of Terms
10、Specific to This Standard:3.1.1 lot,nthe total number of forgings produced from thesame heat of starting material under the same conditions atessentially the same time.4.Ordering Information4.1 Inquiries and orders for material under this specificationshall include the following information:4.1.1 Qu
11、antity,number of pieces4.1.2 ASTM designation,date of issue,and alloy number,4.1.3 Condition,4.1.4 Mechanical properties,4.1.5 Finish,4.1.6 Applicable dimensions or drawing number,4.1.7 Special tests,if any,and4.1.8 Other requirements.1This specification is under the jurisdiction of ASTM Committee F
12、04 onMedical and Surgical Materials and Devices and is the direct responsibility ofSubcommittee F04.12 on Metallurgical Materials.Current edition approved June 1,2011.Published June 2011.Originallyapproved in 1982.Last previous edition approved in 2006 as F799 06.DOI:10.1520/F0799-11.2For referenced
13、 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 page onthe ASTM website.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Flo
14、or,New York,NY 10036,http:/www.ansi.org.4Available from American Society for Quality(ASQ),600 N.Plankinton Ave.,Milwaukee,WI 53203,http:/www.asq.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19
15、428-2959.United States1 5.Materials and Manufacture5.1 Materials for forgings shall be bar,rod,or wire fabri-cated in accordance with Specification F1537.5.2 The material shall be forged by hammering,pressing,rolling,extruding,or upsetting,and shall be processed,ifpractical,so as to cause metal flow
16、 during the hot-workingoperation to be in the most favorable direction for resistingstresses encountered in service,as may be indicated to thesupplier by the purchaser.5.3 Forgings shall be free of splits,scale,cracks,flaws,andother imperfections not consistent with good commercialpractice(see Note 1).Offset or mismatch allowance,dependentupon part size and configuration,shall be within standardforging tolerances.5.4 Optional indentification marks,including the purchas-ers logo,material designat
