| 摘要 |
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 285-3 05 ksi, YS of 220-240 ksi, Charpy V-notch impact toughness energy of 16-20 ft-lb, an d 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 includ ed homogenized annealing, hot rolling, and recrystallization annealing. The ste el was heat treated by oil quenching, refrigeration, and low tempering. The steel h as 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.
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