A steel with low to medium carbon content, low content alloy, tenacious, high resistance, fine grain component of steel, molten steel component.Process for production of steel to make thin and process for production of cast steel with fine level

摘要

A high strength, low alloy, low to medium carbon wrought or cast steel is provided of the Fe/Cr/C type, said steel being characterized by the presence of a small but effective amount of each of Cu and Ni sufficient to enhance the mechanical stability of retained austenite formed following quenching of said steel from its austenitizing temperature, and also including small but effective amounts of Al, Ti and Nb sufficient to provide a fine grained microstructure. The steel consists essentially of about 0.05 to 0.5% C, about 0.1 to 0.5% Si, about 0.5 to 2% Mn, about 0.5 to 4% Cr, about 0.1 to 2% Cu, about 0.1 to 3% Ni, about 0.01 to 0.05% Al, up to about 0.02% Ti, about 0.005 to 0.04% Nb and the balance essentially iron together with minor amounts of impurities, such as P, S, and N in amounts not exceeding about 0.02% P, about 0.015% S, and about 150 ppm N. The steel has an average grain size of less than 100 microns.