Active Standard ASTM B848 | Developed by Subcommittee: B09.11
Book of Standards Volume: 02.05
Historical (view previous versions of standard)
This specification covers the powder forged ferrous materials fabricated by hot densification of atomized prealloyed or iron powders and intended for use as structural parts. The strcutural parts shall be made by hot forging of powder metallurgy preforms in confined dies with or without subsequent heat treatment. The materials shall conform to the required chemical composition for nickel, molybdenum, manganese, copper, chromium, sulfur, silicon, phosphorus, carbon, and oxygen. The mechanical properties such as yield strength, elongation, Rockwell hardness, impact energy, compressive yield strength and fatigue shal be determined using the tensile test method, Charpy V-notch impact energy test method, and hardness test method. The materials shall conform to the required surface finger oxide penetration, interparticle oxide networks, decarburization depth, and nonmetallic inclusion level.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1.1 This specification covers powder forged ferrous materials fabricated by hot densification of atomized prealloyed or iron powders and intended for use as structural parts.
1.2 This specification covers powder forged parts made from the following materials:
220.127.116.11 PF-10XX Carbon Steel (produced from atomized iron powder and graphite powder),
18.104.22.168 PF-10CXX Copper-Carbon Steel (produced from atomized iron powder, copper and graphite powders),
22.214.171.124 PF-11XX Carbon Steel with manganese sulfide for enhanced machinability (produced from atomized iron powder, manganese sulfide, and graphite powders),
126.96.36.199 PF-11CXX Copper-Carbon Steel with manganese sulfide for enhanced machinability (produced from atomized iron powder, copper, manganese sulfide, and graphite powders),
188.8.131.52 PF-42XX Nickel-Molybdenum Steel (produced from prealloyed atomized iron-nickel-molybdenum powder and graphite powder),
184.108.40.206 PF-46XX Nickel-Molybdenum Steel (produced from prealloyed atomized iron-nickel-molybdenum powder and graphite powder),
220.127.116.11 PF-44XX Molybdenum Steel (produced from prealloyed atomized iron-molybdenum powder and graphite powder), and
18.104.22.168 PF-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.
22.214.171.124 Grade 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.
126.96.36.199 Grade 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.
1.3 The 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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A255 Test Methods for Determining Hardenability of Steel
B243 Terminology of Powder Metallurgy
B311 Test Method for Density of Powder Metallurgy (PM) Materials Containing Less Than Two Percent Porosity
B795 Test Method for Determining the Percentage of Alloyed or Unalloyed Iron Contamination Present in Powder Forged (PF) Steel Materials
B796 Test Method for Nonmetallic Inclusion Content of Powders Intended for Powder Forging (PF) Applications
B797 Test Method for Surface Finger Oxide Penetration Depth and Presence of Interparticle Oxide Networks in Powder Forged (P/F) Steel Parts
B934 Test Method for Effective Case Depth of Ferrous Powder Metallurgy (PM) Parts Using Microindentation Hardness Measurements
E3 Guide for Preparation of Metallographic Specimens
E8 Test Methods for Tension Testing of Metallic Materials
E18 Test Methods for Rockwell Hardness of Metallic Materials
E23 Test Methods for Notched Bar Impact Testing of Metallic Materials
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E350 Test Methods for Chemical Analysis of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, and Wrought Iron
E415 Test Method for Atomic Emission Vacuum Spectrometric Analysis of Carbon and Low-Alloy Steel
E562 Test Method for Determining Volume Fraction by Systematic Manual Point Count
E1019 Test Methods for Determination of Carbon, Sulfur, Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt Alloys by Various Combustion and Fusion Techniques
E1077 Test Methods for Estimating the Depth of Decarburization of Steel Specimens
MPIF StandardMPIF35 Materials Standards for PF Steel Parts
ICS Number Code 77.160 (Powder metallurgy)