C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/22 (2006.01) C22C 33/00 (2006.01) C22C 38/04 (2006.01) C22C 38/20 (2006.01) C22C 38/46 (2006.01)
Patent
CA 2612959
A low cost high strength, high toughness, corrosion resistant martensitic steel alloy, with a low concentration of Ni and Mo, has HRC of 52-54, UTS of 285-305 ksi, YS of 220-240 ksi, Charpy V-notch impact toughness energy of 16-20 ft-lb, and corrosion resistance in salt spray test. The laboratory scale ingots of the steel were melted in an open induction furnace and vacuum arc remelting (VAR) 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 austeite, and carbides as centers of growth of the martensite laths. The cost and energy in making the steel are substantially reduced.
Na
Vartanov Gregory
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