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Chromium and manganese are two of the most potent additions to steel for improving hardenability. These elements have traditionally been avoided in standard PM alloys due to the increased difficulty in reducing their oxides compared to molybdenum, nickel, and copper. The availability of dry hydrogen and nitrogen atmospheres and high temperature sintering, coupled with the need for reducing alloying costs, makes these newer chromium-manganese alloys ideal for many high performance applications. The alloys provide a good balance of strength, toughness, ductility, and machinability.
The following tables contain a list of the materials available. For more complete coverage of properties, reference MPIF Standard 35, ASTM B783, ISO 5755, DIN 30910-4, and JIS Z2550, and download the technical information bulletins of interest. Standard powder metal materials are defined in North America by MPIF Standard 35 and ASTM B783, essentially equivalent standards. German PM steels are listed in DIN 30910-4, or more recently, ISO 5755. Japan steels are listed in JIS Z2550, with grade names changing with the revision from 1989 to 2000.
| TYPE |
GRADES |
DESCRIPTION |
| Chromium-Manganese
Steel |
MPIF/ASTM FL-5108, FL-5208, MPIF/ASTM FLC2-5208, FL-5305
ISO FL-07Cr2M, FL-05Cr3M
|
Low alloy steel with prealloyed manganese, chromium, and molybdenum for improved strength and hardenability. |