120-150 mm 400 HB grade super-thick wear-resistant steel plate and manufacturing method thereof

The invention relates to a 120-150 mm 400 HB-grade super-thick wear-resistant steel plate and a production method thereof. The 120-150 mm 400 HB-grade super-thick wear-resistant steel plate comprises the following chemical components in percentage by weight: 0.26 to 0.30 percent of C, 0.10 to 0.40 percent of Si, 1.10 to 1.50 percent of Mn, 0.010 to 0.040 percent of Nb, 0.035 to 0.065 percent of V, 0.015 to 0.025 percent of Ti, 0.03 to 0.06 percent of Al, 0.50 to 0.80 percent of Ni, less than or equal to 0.40 percent of Cu, 0.60 to 0.90 percent of Cr, 0.30 to 0.50 percent of Mo, 0.0015 to 0.005 percent of B, 0.0010 to 0.0050 percent of Ca, less than or equal to 0.010 percent of P, less than or equal to 0.0015 percent of S, less than or equal to The production process comprises the following steps: smelting-gt; performing external refining-gt; performing vacuum degassing-gt; continuous casting-gt; slow cooling of the plate blank-gt; heating rolling-gt; quenching-gt; and medium-temperature tempering. The steel p