NON-QUENCHED AND TEMPERED STEEL WITH HIGH STRENGTH AND HIGH TOUTHNESS AND MANUFACTURING PROCESS THEREOF

摘要

The present invention relates to a titanium alloy having a high hardness and a low manufacturing cost and a method for manufacturing the titanium alloy, wherein the non-refined steel according to an embodiment of the present invention is C: 0.2 to 0.35%, Mn: 0.8 to by weight. 1.2%, Cr: 0.9 to 1.1%, Mo: 0.15% or less (except 0%), Nb: 0.02 to 0.04%, Ti: 0.02 to 0.04%, B: 0.001 to 0.003%, S: 0.02% or less , P: 0.03% or less, C + Mo: 0.45% or less (however, 0% is excluded), the remainder Fe and other unavoidable impurities, and characterized in that it contains a bainite matrix microstructure.