Martensitic Stainless Steel

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The martensitic stainless steels provide higher strength and hardness compared to both the ferritic and austenitic grades, at the expense of reduced corrosion resistance.

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
410 / 420 MPIF/APMI SS-410
ISO FL410
DIN Sint-C43
A small carbon addition (0.2%) to 410L provides a higher strength, higher hardness martensitic structure.
440C SSI-440C-Mod-HTS High temperature liquid phase sintered to near full density to provide a distribution of large carbides in a martensitic matrix for applications requiring high wear resistance, such as grinder plates for food processing equipment.

Martensitic Stainless Steel – As-sintered

Chemistry Typical Properties
GRADE Fe C N Cr Ni Mo Nb(Cb) Density g/cm3 Tensile Strength ksi (MPa) Yield Strength ksi (MPa) Elongation % Unnotched Impact Energy ft-lb (J) Apparent Hardness HRC
SS-410-HT Bal <0.25 <0.6 11.5-13.5 - - - 6.5 105 () ~UTS <1 2.5 () 23

Density ranges for the materials listed are typically for single-pressed parts. Higher densities can be achieved with double-pressing. “HT” attached to a grade name indicates the material has been hardened, either by conventional heat treating or by rapid cooling in the sintering furnace, known as “sinter-hardening”. “HTS” indicates the material has been “high temperature sintered”, i.e. sintered at a minimum temperature of 2200 F (1200 C).