Abstract: Disclosed is a method of producing lithium sulfide (Li2S) without using hydrogen sulfide (H2S) gas. Particularly, the method of producing lithium sulfide (Li2S) includes preparing a starting material including a metal oxide by subjecting a mixed powder including an inorganic compound containing lithium and oxygen, a metal reducing agent, and sulfur (S) to synthesis reaction using mechanical force, preparing a mixed solution by mixing the starting material and a solvent, and obtaining a lithium sulfide (Li2S) powder by removing the metal oxide from the mixed solution and then performing drying.

Abstract: The present invention relates to wear-resistant steel used in construction machines, among others, and more specifically, to high-hardness wear-resistant steel having excellent wear resistance to a thickness of 40 to 130 t (mm) as well as high strength and impact toughness, and to a method for manufacturing the high-hardness wear-resistant steel.

Abstract: One aspect of the present invention aims to provide high-hardness wear-resistant steel having excellent wear resistance to a thickness of 40t (mm) as well as high strength and impact toughness, and a method for manufacturing same.

Abstract: The present invention relates to wear-resistant steel used in construction machines, among others, and more specifically, to high-hardness wear-resistant steel having excellent wear resistance to a thickness of 40 to 130t (mm) as well as high strength and impact toughness, and to a method for manufacturing the high-hardness wear-resistant steel.

Abstract: One aspect of the present invention aims to provide high-hardness wear-resistant steel having excellent wear resistance to a thickness of 40t (mm) as well as high strength and impact toughness, and a method for manufacturing same.

Abstract: A low-yield-ratio type high-strength steel includes 0.02-0.11 wt % of carbon (C), 0.1-0.5 wt % of silicon (Si), 1.5-2.5 wt % of manganese (Mn), 0.01-0.06 wt % of aluminum (Al), 0.1-0.6 wt % of nickel (Ni), 0.01-0.03 wt % of titanium (Ti), 0.005-0.08 wt % of niobium (Nb), 0.1-0.5 wt % of chromium (Cr), 0.01 wt % or less of phosphorus (P) (excluding 0 wt %), 0.01 wt % or less of sulfur (S) (excluding 0 wt %), 5-30 weight ppm of boron (B), 20-70 weight ppm of nitrogen (N), 50 weight ppm or less of calcium (Ca) (excluding 0 weight ppm), 5-50 weight ppm or less of tin (Sn) (excluding 0 weight ppm), and a remainder thereof, being iron (Fe), and other inevitable impurities.