| 摘要 |
The purpose of the present invention is to provide: an abrasion-resistant steel plate which exhibits excellent impact-abrasion resistance characteristics and which is suitable for use in construction machinery, shipbuilding, steel tubing, civil engineering, architecture and so on; and a manufacturing process therefor. In view of the problem, this abrasion-resistant steel plate is characterized in that: the steel plate has a specific steel composition; the DI* defined by formula (1) is 100 to 250; the surface layers of the plate comprise at least 90% of martensite in area fraction and exhibit a Brinell hardness of 450HBW10/3000 or more; and the thicknesswise central zone of the plate comprises at least 70% of lower bainite in area fraction, the thicknesswise central zone being a zone which spreads from the position corresponding to one half of the plate thickness to the positions corresponding to depths of 0.5mm from both surfaces. DI*=33.85 × (0.1×C) |
