| abstract |
Provided is an abrasion-resistant steel sheet that combines gas cutting crack resistance and abrasion resistance with low cost. The steel sheet has a constituent composition containing, in % by mass, C: 0.10-0.23%, Si: 0.01-1.0%, Mn: 0.30-3.00%, P: no more than 0.025%, S: no more than 0.02%, Cr: 0.01-2.00%, Al: 0.001-0.100% and N: no more than 0.01%, with the remainder being made up of Fe and unavoidable impurities. The steel sheet has a structure in which the volume percentage of martensite at a depth of 1 mm from the surface of the abrasion-resistant steel sheet is at least 90%, and the prior austenite grain size at the center in the thickness direction of the abrasion-resistant steel sheet does not exceed 80 µm. The hardness at a depth of 1 mm from the surface of the abrasion-resistant steel sheet is, on the Brinell scale, 360-490 HBW 10/3000, and the concentration of Mn [Mn] (% by mass) and the concentration of P [P] (% by mass) in the central segregation part in the thickness direction of the steel sheet satisfy 0.04 [Mn] + [P] < 0.55. |