HIGH-STRENGTH AND HIGH-DUCTILITY STEEL SHEET, AND METHOD FOR PRODUCING SAME

摘要

According to the present invention, a high manganese steel sheet to which nitrogen is added comprises at least one of 0.5 wt % to 1.0 wt % of carbon, 10 wt % to 20 wt % of manganese, 4.0 wt % or less of chrome, 0.02 wt % to 0.3 wt % of nitrogen, 4 wt % or less of silicon, 3 wt % or less of aluminum, 0.30 wt % or less of niobium, 0.30 wt % or less of titanium, and 0.30 wt % or less of vanadium, and a balance consisting of iron and inevitable impurities. The steel sheet of the present invention may have an austenite structure at room temperature, and stacking fault energy which can be effectively adjusted by adding chromium and nitrogen thereto. Accordingly, a mechanical twin is formed during the plastic deformation of the steel, thus providing the steel with superior work hardening characteristics, high tensile strength and excellent workability.