ASTM B848-2010 Specification for Powder Forged (P F) Ferrous Materials《粉末锻造(P F)钢铁材料规格》.pdf
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1、Designation: B848 10Standard 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 par
2、entheses 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 u
3、se as structural 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 graphi
4、te powders),1.2.1.3 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 Copper-Carbon Steel with manganesesulfide for enhanced machinability (produced from atomizediron powder, copper, man
5、ganese sulfide, and graphite pow-ders),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-44
6、XX Molybdenum Steel (produced from preal-loyed atomized iron-molybdenum powder and graphite pow-der), and1.2.1.8 PF-49XX Molybdenum Steel (produced from preal-loyed atomized iron-molybdenum powder and graphite pow-der).NOTE 1Alloy composition designations are modifications of theAISI-SAE nomenclatur
7、e. For 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.NOTE 2XX designates the forged carbon content, in hundred
8、ths of apercent, that is specified by the purchaser for the application. For a givenspecified carbon content, the permissible limits shall be as specified in 6.2.NOTE 3The old acronym for powder forging P/F has been replaced byPF throughout the document. The change in the prefix for the materialdesi
9、gnations is just 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 o
10、f those sections 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
11、partdrawing shall not 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. Combi
12、ningvalues from the two 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
13、Two Percent PorosityB795 Test Method for Determining the Percentage of Al-loyed or Unalloyed Iron Contamination Present in PowderForged (PF) Steel MaterialsB796 Test Method for Nonmetallic Inclusion Content ofPowders Intended for Powder Forging (PF) ApplicationsB797 Test Method for Surface Finger Ox
14、ide PenetrationDepth and Presence of Interparticle Oxide Networks inPowder Forged (P/F) Steel PartsB934 Test Method for Effective Case Depth of FerrousPowder Metallurgy (P/M) Parts Using MicroindentationHardness MeasurementsE3 Guide for Preparation of Metallographic SpecimensE8 Test Methods for Tens
15、ion Testing of Metallic Materials1This specification is under the jurisdiction of ASTM Committee B09 on MetalPowders and Metal Powder Products and is the direct responsibility of Subcom-mittee B09.11 on Near Full Density Powder Metallurgy Materials.Current edition approved Dec. 1, 2010. Published Ma
16、rch 2011. Originallyapproved in 1994. Last previous edition approved in 2005 as B848 05. DOI:10.1520/B0848-10.2For 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 st
17、andards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.E18 Test Methods for Rockwell Hardness of Metallic Ma-terialsE23 Test
18、Methods for Notched Bar Impact Testing ofMetallic MaterialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE350 Test Methods for Chemical Analysis of Carbon Steel,Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, andWrought IronE415 Test Method
19、for Atomic Emission Vacuum Spectro-metric Analysis of Carbon and Low-Alloy SteelE562 Test Method for Determining Volume Fraction bySystematic Manual Point CountE1019 Test Methods for Determination of Carbon, Sulfur,Nitrogen, and Oxygen in Steel, Iron, Nickel, and CobaltAlloys by Various Combustion a
20、nd Fusion TechniquesE1077 Test Methods for Estimating the Depth of Decarbur-ization of Steel Specimens2.2 MPIF Standard:3MPIF 35 Materials Standards for PF Steel Parts3. Terminology3.1 DefinitionsDefinitions of powder metallurgy termscan be found in Terminology B243. Additional descriptiveinformatio
21、n is available in the Related Material Section of Vol.02.05 of the Annual Book of ASTM Standards.3.2 Descriptions of Terms Specific to This Standard:3.2.1 core regiona core region is one where there is eitherno decarburization as determined by the procedure in 9.3.4 orthere is no hardened surface as
22、 determined by the procedure inS2.2.3.2.2 critical regiona critical region of a part is one thatrequires a density level or a microstructural characteristic to beseparately specified.4. Ordering Information4.1 Orders for parts conforming to this specification shallinclude the following:4.1.1 Alloy c
23、omposition, including carbon content (see1.2.1, Section 6, and Table 2),4.1.2 Grade (minimum density requirementsee 1.2.2 andSection 7),4.1.3 Heat treatment condition and hardness (see 8.1.3,8.1.4, and 8.2.3),4.1.4 Location of critical regions (see 3.2.2),3Available from Metal Powder Industries Fede
24、ration, 105 College Road East,Princeton, NJ 085406692.TABLE 1 Minimum Density for Selected Powder Forged SteelCompositions (Fully Annealed Heat Treatment ConditionFerrite/Pearlite Microstructure)A,BChemical CompositionDensity (g/cm3)Grade A(0.5 % porosity)CGrade B(1.5 % porosity)CPF-1040 7.81 7.74PF
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