Nickel-based alloy for nuclear power and manufacturing method thereof

The nickel-based alloy comprises the following chemical components in percentage by weight: 0.020 to 0.050 percent of C, less than or equal to 0.30 percent of Si, less than or equal to 0.30 percent of Mn, 16.0 to 19.0 percent of Cr, 2.0 to 3.0 percent of Mo, 4.20 to 5.20 percent of Nb, 1.00 to 2.00 percent of Ti, 0.50 to 0.80 percent of Al, 15.0 to 18.0 percent of Fe, 0.005 to 0.010 percent of P, 0.0020 to 0.0040 percent of B, less than or equal to 0.002 percent of S, 0.0010 to 0.0030 percent of Mg, less than or equal to 0.010 percent of N, less than or equal to 0.20 percent of Cu and the balance of Ni and other inevitable impurities, and the following requirements are simultaneously met: Mg/S is more than or equal to 1.5 and less than or equal to 3.0, Ti/Al is The ring piece prepared from the nickel-based alloy is better in room-temperature and high-temperature mechanical properties and corrosion resistance, the room-temperature tensile strength is larger than or equal to 1250 MPa, the room-temperature yield