The invention discloses an economical steel plate for an HRC36 plastic mold, the thickness of the steel plate is 80-130 mm, and the steel plate is prepared from the following chemical components in percentage by
mass (wt%): 0.43-0.46% of C, 0.20-0.40% of Si, 1.00-1.30% of Mn, less than or equal to 0.015% of P, less than or equal to 0.002% of S, 0.020-0.040% of Als, 1.80-2.00% of Cr, 0.020-0.030% of Nb, less than or equal to 0.030% of V, less than or equal to 0.30% of Ni, 0.15-0.20% of Mo, less than or equal to 0.020% of Ti and the balance of Fe and residual elements. The
hardness of the steel plate is 34-38 HRC, and the
hardness difference of the same plate is less than or equal to 4 HRC; the steel plate is reasonable in chemical component combination and uniform and stable in
hardness performance, has the advantages of high hardness,
high wear resistance and low cost, and can meet the actual production,
processing and use requirements of the mold industry; the production method is simple, production organization in the technical field of wide and
thick plate metallurgy is facilitated, and meanwhile the comprehensive performance can meet the use requirement.