ULTRA-LOW TEMPERATURE AUSTENITIC HIGH-MANGANESE STEEL MATERIAL HAVING EXCELLENT SHAPE AND MANUFACTURING METHOD THEREOF

摘要

An ultra-low temperature austenitic high-manganese steel material having excellent shape according to one aspect of the present invention comprises: 0.2-0.5 wt% of C, 23-28 wt% of Mn, 0.05-0.5 wt% of Si, 1 wt% or less (excluding 0 wt%) of Cu, 0.03 wt% or less of P, 0.005 wt% or less of S, 0.5 wt% or less of Al, 2.5-4.5 wt% of Cr, 0.0005-0.01 wt% of B, and the remaining balance of Fe and other inevitable impurities. The steel material has a microstructure including 95 area% or more of austenite, and has a Charpy impact toughness of 30 J or more at -196C (based on a thickness of 5 mm). In addition, the maximum height difference between a ridge and a groove formed in a region within 2 m along a rolling direction may be within 10 mm.;COPYRIGHT KIPO 2020