Low cost high strength martensitic stainless steel

Details Low cost high strength martensitic stainless steel Low cost high strength martensitic stainless steel

2008-10-25

2011-12-06

Wyszomierski, George (Department: 1733)

Alloys or metallic compositions

Ferrous

Copper containing

C420S091000, C420S060000, C420S061000, C148S326000, C148S335000

Reexamination Certificate

active

08071017

ABSTRACT:
A cobalt-free low cost high strength martensitic stainless steel, with concentration of Ni up to 3.0% and Mo up to 1.0% of weight, has HRC of 53, UTS of 297 ksi, YS of 220 ksi, Charpy V-notch impact energy of 17.8 ft-lb, corrosion resistance in salt spray test ASTM 117. The steel was melted in an open induction furnace and vacuum arc remelting (VAR) and/or electroslag remelting (ESR) were not used to refine the steel. Further processing included homogenized annealing, hot rolling, and recrystallization annealing. The steel was heat treated by oil quenching, refrigeration, and low tempering. The steel has a microstructure consisting essentially of small packets of fine martensite laths, retained austenite, and carbides as centers of growth of the martensite laths. The cost and energy in making the steel are substantially reduced.

REFERENCES:
patent: 2005/0011589 (2005-01-01), Ishida et al.
patent: 2005/0103408 (2005-05-01), Kuehmann et al.
patent: 2007-277639 (2007-10-01), None

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