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ASTM B 848 : 2015 : REDLINE

ASTM B 848 : 2015 : REDLINE

Current

Current

The latest, up-to-date edition.

Standard Specification for Powder Forged (PF) Ferrous Materials

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PDF

Language(s)

English

Published date

01-11-2015

Publisher

American Society for Testing and Materials

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PDF - English
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CONTAINED IN VOL. 02.05, 2017 Describes powder forged ferrous materials fabricated by hot densitification of atomized prealloyed or iron powders and intended for use as structural parts.

Committee
B 09
DevelopmentNote
Supersedes FORD ESP M10A68 A. (04/2012)
DocumentType
Redline
Pages
12
PublisherName
American Society for Testing and Materials
Status
Current

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.

ASTM B 795 : 2013 : REDLINE Standard Test Method for Determining the Percentage of Alloyed or Unalloyed Iron Contamination Present in Powder Forged (PF) Steel Materials
ASTM B 311 : 2017 : REDLINE Standard Test Method for Density of Powder Metallurgy (PM) Materials Containing Less Than Two Percent Porosity
ASTM B 797 : 2015 : REDLINE Standard Test Method for Surface Finger-Oxide Penetration Depth and Presence of Interparticle Oxide Networks in Powder Forged (PF) Steel Parts
ASTM B 934 : 2015 : REDLINE Standard Test Method for Effective Case Depth of Ferrous Powder Metallurgy (PM) Parts Using Microindentation Hardness Measurements
ASTM B 796 : 2014 : REDLINE Standard Test Method for Nonmetallic Inclusion Content of Ferrous Powders Intended for Powder Forging (PF) Applications

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