Nickel-based superalloy steel and preparation method thereof

A preparation method of a nickel-based superalloy, wherein the nickel-based superalloy comprises the following components by mass percentage:

• C:
• 0.07% to 0.09%, Si:
• 0.42% to 0.65%, Mn:
• 1.0% to 1.40%, P≤0.020%, S≤0.005%, Cr:
• 19% to 23%, Ni:
• 31.0% to 34%, Cu:
• 0.02% to 0.25%, Al:
• 0.20% to 0.30%, Ti:
• 0.15% to 0.35%, and Fe as the balance;
• the preparation method comprising the following steps:
• subjecting an alloy raw material to roughing, refining, degassing in a vacuum oxygen decarburisation converter (VODC), and pouring sequentially to obtain a steel ingot;
• and
• annealing the steel ingot to obtain the nickel-based superalloy;
• wherein the roughing comprises electric-arc furnace (EAF) roughing;
• and
• wherein the EAF roughing comprises melting conducted at 4,800 kV·A to 5,000 kV·A and greater than or equal to 1,620° C., oxidation conducted at 4,500 kV·A to 4,800 kV·A and greater than or equal to 1,650° C., and reduction conducted at 4,500 kV·A to 4,800 kV·A and greater than or equal to 1,650° C.