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  • ASTM B 848 : 2015

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    Standard Specification for Powder Forged (PF) Ferrous Materials

    Available format(s):  Hardcopy, PDF

    Superseded date:  22-09-2021

    Language(s):  English

    Published date:  11-12-2015

    Publisher:  American Society for Testing and Materials

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    1.1This specification covers powder forged ferrous materials fabricated by hot densification of atomized prealloyed or iron powders and intended for use as structural parts.

    1.2This specification covers powder forged parts made from the following materials:

    1.2.1Compositions:

    1.2.1.1PF-10XX Carbon Steel (produced from atomized iron powder and graphite powder),

    1.2.1.2PF-10CXX Copper-Carbon Steel (produced from atomized iron powder, copper and graphite powders),

    1.2.1.3PF-11XX Carbon Steel with manganese sulfide for enhanced machinability (produced from atomized iron powder, manganese sulfide, and graphite powders),

    1.2.1.4PF-11CXX, PF-1130CXX, and PF-1135CXX Copper-Carbon Steels with manganese sulfide for enhanced machinability (produced from atomized iron powder, copper, manganese sulfide, and graphite powders),

    1.2.1.5PF-42XX Nickel-Molybdenum Steel (produced from prealloyed atomized iron-nickel-molybdenum powder and graphite powder),

    1.2.1.6PF-46XX Nickel-Molybdenum Steel (produced from prealloyed atomized iron-nickel-molybdenum powder and graphite powder),

    1.2.1.7PF-44XX Molybdenum Steel (produced from prealloyed atomized iron-molybdenum powder and graphite powder), and

    1.2.1.8PF-49XX Molybdenum Steel (produced from prealloyed atomized iron-molybdenum powder and graphite powder).

    Note 1:Alloy composition designations are modifications of the AISI-SAE nomenclature. For example: 10CXX designates a plain carbon steel containing copper and XX amount of carbon. Compositional limits of alloy and impurity elements may be different from the AISI-SAE limits. Chemical composition limits are specified in Section 6.

    Note 2:XX designates the forged carbon content, in hundredths of a percent, that is specified by the purchaser for the application. For a given specified carbon content, the permissible limits shall be as specified in 6.2.

    Note 3:The old acronym for powder forging P/F has been replaced by PF throughout the document. The change in the prefix for the material designations is just to match the currently approved acronym for powder forging. No change has been made to the material specification and performance characteristics for the various powder forged materials.

    1.2.2Grades:

    1.2.2.1Grade A—Density equivalent to a maximum of 0.5 % porosity. The minimum density of those sections of the powder forged part so designated by the applicable part drawing shall not be less than the value specified in Table 1.

    (A)Quench-hardening and tempering will reduce the density values. Normalized samples may have lower density values then fully annealed materials.
    (B)For the purpose of determining conformance with this specification, measured values shall be rounded “to the nearest unit” in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice E29.
    (C)Based on the method described in Smith, D. W., “Calculation of the Pore-Free Density of PM Steels: Role of Microstructure and Composition,” The International Journal of Powder Metallurgy, Vol 28, No. 3, 1992, p. 259. Calculations based on 350 ppm max oxygen content and all oxygen combined as 3MnO · Al2O3 · 3SiO 2.
    (D)The method described by Smith is not considered applicable to steels with admixed copper additions. Pore-free densities for these materials were determined by experiment.

    1.2.2.2Grade B—Density equivalent to a maximum of 1.5 % porosity. The minimum density of those sections of the powder forged part so designated by the applicable part drawing shall not be less than the value specified in Table 1.

    1.3The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

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    Committee B 09
    Document Type Standard
    Publisher American Society for Testing and Materials
    Status Superseded
    Superseded By
    Supersedes

    Standards Referencing This Book - (Show below) - (Hide below)

    ASTM E 1077 : 2014 Standard Test Methods for Estimating the Depth of Decarburization of Steel Specimens
    ASTM E 1077 : 2014 : R2021 Standard Test Methods for Estimating the Depth of Decarburization of Steel Specimens
    ASTM E 29 : 2002 Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
    ASTM B 934 : 2021 Standard Test Method for Effective Case Depth of Ferrous Powder Metallurgy (PM) Parts Using Microindentation Hardness Measurements
    ASTM E 1019 : 2018 Standard Test Methods for Determination of Carbon, Sulfur, Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt Alloys by Various Combustion and Inert Gas Fusion Techniques
    ASTM E 1077 : 1991 : R1997 Standard Test Methods for Estimating the Depth of Decarburization of Steel Specimens
    ASTM B 311 : 1993 : R1997 Test Method for Density Determination for Powder Metallurgy (P/M) Materials Containing Less Than Two Percent Porosity
    ASTM B 795 : 1993 : R1997 Standard Test Method for Determining the Percentage of Alloyed or Unalloyed Iron Contamination Present in Powder Forged (P/F) Steel Parts
    ASTM E 1019 : 2003 Standard Test Methods for Determination of Carbon, Sulfur, Nitrogen, and Oxygen in Steel and in Iron, Nickel, and Cobalt Alloys
    ASTM E 1019 : 2008 Standard Test Methods for Determination of Carbon, Sulfur, Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt Alloys by Various Combustion and Fusion Techniques
    ASTM E 23 : 2002 Standard Test Methods for Notched Bar Impact Testing of Metallic Materials
    ASTM B 934 : 2015 Standard Test Method for Effective Case Depth of Ferrous Powder Metallurgy (PM) Parts Using Microindentation Hardness Measurements
    ASTM E 1077 : 2001 : EDT 1 Standard Test Methods for Estimating the Depth of Decarburization of Steel Specimens
    ASTM E 1077 : 2001 : R2005 Standard Test Methods for Estimating the Depth of Decarburization of Steel Specimens
    ASTM E 1077 : 2001 Standard Test Methods for Estimating the Depth of Decarburization of Steel Specimens
    ASTM E 1019 : 2000 Standard Test Methods for Determination of Carbon, Sulfur, Nitrogen, and Oxygen in Steel and in Iron, Nickel, and Cobalt Alloys
    ASTM E 562 : 1999 Standard Test Method for Determining Volume Fraction by Systematic Manual Point Count
    ASTM E 1019 : 2002 Standard Test Methods for Determination of Carbon, Sulfur, Nitrogen, and Oxygen in Steel and in Iron, Nickel, and Cobalt Alloys
    ASTM E 1019 : 2011 Standard Test Methods for Determination of Carbon, Sulfur, Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt Alloys by Various Combustion and Fusion Techniques
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