Die steel roller for large and medium-sized channel steel finished rack and casting process of die steel roller

The invention discloses a die steel roller for large and medium channel steel finished racks and a casting process thereof, the die steel roller comprises a roller body, and the roller body comprises the following chemical components in percentage by mass: 1.40-1.60% of C, 0.30-0.50% of Si, 0.4-0.60% of Mn, 8.00-14.00% of Cr, 0.60-0.80% of Mo, 0.80-1.20% of V, 0.40-0.60% of Nb, more than or equal to 0.01% of Re, less than or equal to 0.03% of P, less than or equal to 0.025% of S and the balance of Fe and inevitable impurities; the casting process comprises the following steps: smelting early-stage molten steel; slagging; refining finished roller molten steel; sampling, detecting and judging whether the chemical components are qualified or not; casting a blank roller; performing special heat treatment; and roller technology detection. The high-hardness wear-resistant roller is high in hardness and good in wear resistance, a working layer basically has no hardness difference, the impact toughness, the tensile s