High-strength abrasion-resisting steel plate and production method thereof

The invention provides a high-strength abrasion-resisting steel plate and a production method thereof. The chemical components of the high-strength abrasion-resisting steel plate include, by weight, 0.25-0.30% of C, 0.3-0.5% of Si, 0.40-1.00% of Mn, 0.6-1.2% of Cr, 0.15-0.4% of Mo, 0.01-0.03% of Nb, smaller than or equal to 0.50% of Ni, smaller than or equal to 0.50% of Cu, 0.0005-0.0022% of B, 0.025-0.04% of Ti, 0.020-0.045% of Als, smaller than or equal to 0.015% of P and smaller than or equal to 0.005% of S, wherein Ti/N is greater than or equal to 3.4. During refining, molten steel [N] is controlled to be smaller than or equal to 0.0080%, [O] is controlled to be smaller than or equal to 0.0020%, it is ensured that the effective boron content is 0.0010-0.0020%, and stacking for slow-cooling is performed for 48 hours or more after continuous casting. Two-stage rolling control is adopted, the finish rolling temperature at the first stage is 980-1050 DEG C, out-line quenching is conducted on plate blanks with the thickness greater than 50 mm at the second stage, swinging is performed at the low-pressure section of a quenching machine, on-line quenching is conducted on plate blanks with the thickness smaller than or equal to 50 mm, and residual heat is utilized to perform self tempering. The high-strength abrasion-resisting steel plate has lower carbon and manganese contents and good weldability, the surface hardness is greater than 550 HB, and the toughness at the low temperature of -40 DEG C is greater than 30 J, and the maximum thickness can be up to 120 mm.