1、Designation:B78313Standard Specification forMaterials for Ferrous Powder Metallurgy(PM)StructuralParts1This standard is issued under the fixed designation B783;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision
2、.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers a variety of ferrous PM struc-tural materials and includes a classification system or materialdesignation code
3、.The classification system used in this speci-fication includes chemical composition,minimum tensile;0.2%offset yield strength for as-sintered materials and mini-mum ultimate tensile strength for heat-treated materials(sinterhardened or quenched and tempered).It also contains mini-mum density and ma
4、ximum coercive field strength require-ments for iron-phosphorus materials.1.2 Material classification is governed by the designationcode which is explained in Appendix X1.The data provideddisplay typical mechanical properties achieved under commer-cial manufacturing procedures.Physical and mechanica
5、l prop-erty performance characteristics can change as a result ofsubsequent processing steps beyond the steps designated in thisstandard.1.3 With the exception of density values for which theg/cm3unit is the industry standard,property values stated ininch-pound units are the standard.Values in SI un
6、its result fromconversion.They may be approximate and are only forinformation.2.Referenced Documents2.1 ASTM Standards:2A839 Specification for Iron-Phosphorus Powder MetallurgyParts for Soft Magnetic ApplicationsB243 Terminology of Powder MetallurgyB528 Test Method for Transverse Rupture Strength of
7、 Pow-der Metallurgy(PM)SpecimensB962 Test Methods for Density of Compacted or SinteredPowder Metallurgy(PM)Products Using ArchimedesPrincipleB963 Test Methods for Oil Content,Oil-ImpregnationEfficiency,and Surface-Connected Porosity of SinteredPowder Metallurgy(PM)Products Using ArchimedesPrincipleE
8、8 Test Methods for Tension Testing of Metallic MaterialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE1019 Test Methods for Determination of Carbon,Sulfur,Nitrogen,and Oxygen in Steel,Iron,Nickel,and CobaltAlloys by Various Combustion and Fusion T
9、echniques2.2 MPIF Standard:3MPIF Standard 35 Materials Standards for PM StructuralParts3.Terminology3.1 DefinitionsDefinitions of powder metallurgy termscan be found in Terminology B243.Additional descriptiveinformation is available in the Related Materials section of Vol02.05 of the Annual Book of
10、ASTM Standards.4.Ordering Information4.1 Materials for parts conforming to this specification shallbe ordered by material designation code.4.2 Orders for parts under this specification may include thefollowing information:4.2.1 Certification and test reports,if required(see Section11),4.2.2 Test met
11、hods and mechanical properties other thanstrength(see 8.2 and 8.3),4.2.3 Density(see 7.1),4.2.4 Porosity or oil content(see 7.2),and4.2.5 Special packaging if required.5.Materials and Manufacture5.1 Structural parts shall be made by compacting andsintering metal powders with or without subsequent he
12、at-treating.Parts may also be made by repressing or repressingand resintering sintered parts,if necessary,with or without1This specification is under the jurisdiction of ASTM Committee B09 on MetalPowders and Metal Powder Products and is the direct responsibility of Subcom-mittee B09.05 on Structura
13、l Parts.Current edition approved Nov.1,2013.Published November 2013.Originallyapproved in 1988.Last previous edition approved in 2010 as B783 10.DOI:10.1520/B0783-13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book
14、of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from MPIF,105 College Road East,Princeton,NJ 08540.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 subsequent heat treatment to
15、 produce finished parts conformingto the requirements of this specification.6.Chemical Composition6.1 The material shall conform to the requirements of Table1.6.2 Chemical analysis,if required,shall be performed bymethods agreed upon by the producer and the user.6.3 Various analytical test methods a
16、re used to determinethe chemical composition(see ASTM standards for the appro-priate test methods)of PM materials.Combustion-infra-redabsorption and inert gas fusion methods(Test Methods E1019)are used for the specific elements carbon,nitrogen,oxygen,and sulfur.6.4 The Chemical Composition Requirements Table(Table1)designates the limits of metallurgically combined carbon foreach alloy.The combined carbon level can be estimatedmetallographically for sintered PM steels.When a clear pearl-ite to fe
