Refractory steel material for supercritical turbine blade and preparation method thereof

The invention relates to a refractory steel material for a supercritical turbine blade and a preparation method thereof. The refractory steel material for a supercritical turbine blade is prepared from the following components in percentage by weight: 0.09-0.15% of C, 10.0-10.5% of Cr, 0.65-0.75% of Mo, 3.0-3.5% of Co, 1.7-1.9% of W, 0.15-0.25% of V, 0.03-0.07% of Nb, 0.01-0.035% of N, 0.003-0.008% of B, 0.03-0.07% of Ta, and the balance of Fe and impurities. The preparation method comprises the following steps: preliminarily smelting required elements in a non-vacuum induction furnace at 1530-1600 DEG C, wherein the contents of elements are regulated and the impurity contents are controlled as low as possible in the smelting process; casting the solution into a consumable electrode; and carrying out remelting refining on the consumable electrode in an electroslag furnace, and preparing an electroslag ingot while maximally lowering the contents of impurity elements. The invention can satisfy the technical requirement for the high-temperature durability of the turbine blade material.