1、Designation:B84815Standard Specification forPowder Forged(PF)Ferrous Materials1This standard is issued under the fixed designation B848;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 parentheses
2、 indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification covers powder forged ferrous materi-als fabricated by hot densification of atomized prealloyed oriron powders and intended for use as struct
3、ural parts.1.2 This specification covers powder forged parts madefrom the following materials:1.2.1 Compositions:1.2.1.1 PF-10XX Carbon Steel(produced from atomizediron powder and graphite powder),1.2.1.2 PF-10CXX Copper-Carbon Steel(produced fromatomized iron powder,copper and graphite powders),1.2
4、.1.3 PF-11XX Carbon Steel with manganese sulfide forenhanced machinability(produced from atomized iron powder,manganese sulfide,and graphite powders),1.2.1.4 PF-11CXX,PF-1130CXX,and PF-1135CXXCopper-Carbon Steels with manganese sulfide for enhancedmachinability(produced from atomized iron powder,cop
5、per,manganese sulfide,and graphite powders),1.2.1.5 PF-42XX Nickel-Molybdenum Steel(producedfrom prealloyed atomized iron-nickel-molybdenum powderand graphite powder),1.2.1.6 PF-46XX Nickel-Molybdenum Steel(producedfrom prealloyed atomized iron-nickel-molybdenum powderand graphite powder),1.2.1.7 PF
6、-44XX Molybdenum Steel(produced from preal-loyed atomized iron-molybdenum powder and graphitepowder),and1.2.1.8 PF-49XX Molybdenum Steel(produced from preal-loyed atomized iron-molybdenum powder and graphite pow-der).NOTE1Alloy composition designations are modifications of theAISI-SAE nomenclature.F
7、or example:10CXX designates a plain carbonsteel containing copper and XX amount of carbon.Compositional limitsof alloy and impurity elements may be different from theAISI-SAE limits.Chemical composition limits are specified in Section 6.NOTE2XX designates the forged carbon content,in hundredths of a
8、percent,that is specified by the purchaser for the application.For a givenspecified carbon content,the permissible limits shall be as specified in 6.2.NOTE3The old acronym for powder forging P/F has been replaced byPF throughout the document.The change in the prefix for the materialdesignations is j
9、ust to match the currently approved acronym for powderforging.No change has been made to the material specification andperformance characteristics for the various powder forged materials.1.2.2 Grades:1.2.2.1 Grade ADensity equivalent to a maximum of0.5%porosity.The minimum density of those sections
10、of thepowder forged part so designated by the applicable partdrawing shall not be less than the value specified in Table 1.1.2.2.2 Grade BDensity equivalent to a maximum of1.5%porosity.The minimum density of those sections of thepowder forged part so designated by the applicable partdrawing shall no
11、t be less than the value specified in Table 1.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two
12、systems may result in non-conformancewith the standard.2.Referenced Documents2.1 ASTM Standards:2A255 Test Methods for Determining Hardenability of SteelB243 Terminology of Powder MetallurgyB311 Test Method for Density of Powder Metallurgy(PM)Materials Containing Less Than Two Percent PorosityB795 T
13、est Method for Determining the Percentage of Al-loyed or Unalloyed Iron Contamination Present in PowderForged(PF)Steel MaterialsB796 Test Method for Nonmetallic Inclusion Content ofFerrous Powders Intended for Powder Forging(PF)Ap-plicationsB797 Test Method for Surface Finger-Oxide PenetrationDepth
14、and Presence of Interparticle Oxide Networks inPowder Forged(PF)Steel PartsB934 Test Method for Effective Case Depth of FerrousPowder Metallurgy(PM)Parts Using MicroindentationHardness Measurements1This specification is under the jurisdiction of ASTM Committee B09 on MetalPowders and Metal Powder Pr
15、oducts and is the direct responsibility of Subcom-mittee B09.11 on Near Full Density Powder Metallurgy Materials.Current edition approved Nov.1,2015.Published December 2015.Originallyapproved in 1994.Last previous edition approved in 2010 as B848 10.DOI:10.1520/B0848-15.2For referenced ASTM standard
16、s,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.*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 E3 Guide for Preparation of Metallographic SpecimensE8 Test Methods for Tension Testing of Metallic MaterialsE18 Test Me