High-toughness mine disk saw blade steel plate and manufacturing method thereof

The invention relates to a high-toughness mine disk saw blade steel plate and a production method thereof. The high-toughness mine disk saw blade steel plate comprises the following chemical components in percentage by weight: 0.47-0.52% of C, 0.40-0.60% of Si, 1.30-1.50% of Mn, 0.08-0.12% of V, 0.03-0.06% of Al, 0.10-0.30% of Cr, less than or equal to 0.012% of P, less than or equal to 0.002% of S, 0.0010-0.0030% of Ca, less than or equal to 0.002% of O, less than or equal to 0.004% of N, less than or equal to 0.0002% of H and the balance of Fe and inevitable impurity elements. The production process comprises the following steps: converter steelmaking-gt; lF refining-gt; vD or RH vacuum degassing-gt; ca treatment-gt; continuous casting-gt; hot delivery-gt; heating-gt; rolling-gt; slow cooling of the steel plate-gt; quenching-gt; and tempering. The thickness of the steel plate is smaller than or equal to 12 mm, the width can reach 4000 mm, the toughness of the steel plate is excellent, the impact Akv at 20 D