Nickel-based air valve alloy and preparation method thereof

The invention discloses nickel-based air valve alloy. The nickel-based air valve alloy comprises 55.0 to 60.0% of Ni, 20.0 to 25.0% of Cr, 0.01 to 0.05% of C, 1.0 to 3.0% of Al, 1.0 to 3.0% of Ti, 0.5 to 1.5% of W, 0.5 to 1.5% of Nb, 0.5 to 1.5% of Mo, 0.05 to 0.20% of Y, 0.05 to 0.20% of Hf, 0.001 to 0.005% of B, not greater than 0.02% of S, not greater than 0.02% of P, not greater than 0.02% of O, not greater than 0.02% of N, and the balance of Fe and inevitable impurities, wherein the impurity content is not greater than 0.5%. The preparation method comprises the steps of sensing and melting under a vacuum condition; casting an electrode; remelting electroslag; thermally forging; locally modifying and grinding a quadrate ingot blank; thermally rolling; compensating temperature online; thermally rolling a steel wire rod. The nickel-based air valve alloy has high-temperature durability, high-temperature oxidation resistance, high wearability and high-temperature corrosion resistance.