ABRASION-RESISTANT STEEL SHEET HAVING EXCELLENT PROCESSABILITY, AND METHOD FOR PRODUCTION THEREOF

摘要

Disclosed is an abrasion-resistant steel sheet which is suitable for a member that contacts with dirt such as a power shovel and has excellent processability in bending. Also disclosed is a method for producing the steel sheet. Specifically disclosed is a steel sheet which comprises the following components (by mass): C: 0.05 to 0.35%, Si: 0.05-1.0%, Mn: 0.1 to 2.0%, Ti: 0.1 to 1.2% and Al: 0.1% or less, further comprises at least one member selected from 0.1 to 1.0% of Cu, 0.1 to 2.0% of Ni, 0.1 to 1.0% of Cr, 0.05 to 1.0% of Mo, 0.05 to 1.0% of W and 0.0003 to 0.0030% of B (by mass), has a DI* value represented by the formula below of less than 60, and optionally comprises one or two members selected from 0.005 to 1.0% of Nb and 0.005 to 1.0% of V (by mass), with the remainder being Fe and inevitable impurities: DI* = 33.85x(0.1xC*)0.5x(0.7xSi+1)x(3.33xMn+1)x (0.35xCu+1)x(0.36xNi+1)x(2.16xCr+1)x(3xMo*+1)x(1.5xW*+1) (1) [wherein C* = C-1/4x(Ti-48/14N); Mo* = Mox(1-0.5x(Ti-48/14N)); and W* = Wx(1-0.5x(Ti-48/14N))].