DUCTILE ULTRAHIGH STRENGTH STEEL MAINLY CONSISTING OF QUENCHED AND TEMPERED STEEL AND A METHOD OF MANUFACTURING THE SAME

摘要

Ductile ultrahigh strength steel composed of multiple layers formed by combining quenched and tempered steel plates with nonferrous metal or nonferrous alloy plates whose modulus of elasticity is not higher than and whose percentage of elongation and rate of reduction of area are greater than those of the quenched and tempered steel and being characterized by extremely low diffusion of iron and carbon which are the principal components of the steel and the wetting phenomenon with the quenched and tempered steel, which steel product does not exhibit unstable fractures but retains suitable elongation and ductility and has a tensile strength of more than 180 kg./mm.2.