Patent ID: 8702879
Filing Date: 2014-04-22
Classification: C21D,C22C,F16C

Abstract:
1. A method for producing martensitic steel that comprises alloying elements such that the steel can be hardened by an intermetallic compound and carbide precipitation, with an Al content of between 0.4% and 3%, the method comprising: subjecting the steel to heat shaping, wherein: a heat shaping temperature for a last heat shaping pass is less than solid-state solubility temperature of aluminum nitrides in the steel; a heat shaping temperature of each of the heat shaping passes preceding a last heat shaping pass is less than the solid-state solubility temperature of the aluminum nitrides in the steel; and the heat treatment temperature for each optional heat treatment after the last heat shaping pass is less than the solid-state solubility temperature of the aluminum nitrides in the steel.