Fracture-tough, high hardness stainless steel and method of maki

Details Fracture-tough, high hardness stainless steel and method of maki Fracture-tough, high hardness stainless steel and method of maki

1992-02-13

1993-06-22

Yee, Deborah

Metal treatment

Stock

Ferrous

148328, 148318, 148578, C22C 3852, C21D 800, C21D 106

Patent

active

052213722

ABSTRACT:
A cryogenically-formed and tempered stainless steel is provided having improved fracture toughness and corrosion resistance at a given hardness level, such as, for example, of at least about Rc 60 for bearing applications. The steel consists essentially of, in weight %, about 21 to about 24% Co, about 11 to about 13% Cr, about 7 to about 9% Ni, about 0.1 to about 0.5% Mo, about 0.2 to about 0.3% V, about 0.28 to about 0.32% C, and the balance iron. The steel includes a cryogenically-formed martensitic microstructure tempered to include about 5 to about 10 volume % post-deformation retained austenite dispersed therein and M.sub.2 C-type carbides, where M is Cr, Mo, V, and/or Fe, dispersed in the microstructure.

REFERENCES:
patent: 3891477 (1975-06-01), Lance et al.

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