Nickel-based welding wire for main equipment of nuclear island of nuclear power station

Abstract

The invention belongs to the technical field of welding materials, and particularly discloses a nickel-based welding wire for main equipment of a nuclear island of an AP1000 nuclear power station. The method is applicable to welding pressure containers of reactors (including welding of driving tube seats, safe seats of connecting tubes and supporting blocks of reactor cores) and welding of steam generators (including build-up welding of tube plates and welding of tubes and the tube plates), and solves problems that welding wires of the kind in the prior art are always imported, cost is high and the like. Basic chemical components of the nickel-based welding wire include, by weight ratio, from 28.0 to 31.5% of Cr, from 7.0 to 11.0% of Fe, from 0.4 to 1.0% of Ti, from 0.25 to 1.10% of Al, from 0.90 to 1.5% of Al+Ti, lower than or equal to 1.0% of Mn, lower than or equal to 0.02% of Nb, lower than 0.04% of C, lower than or equal to 0.15% of Si, lower than 0.005% of P, lower than 0.005% of S, lower than 0.001% of B, lower than 0.02% of Zr, lower than 0.005% of Ca, lower than 0.005% of Mg, lower than 0.02% of Ta, lower than 0.02% of Cu, lower than 0.05% of Co, lower than 0.5% of Mo and the balance Ni. By the aid of the welding wire, microalloying of weld joints can be realized, the weld joints meet standard requirements, and the welding wire can replace imported welding wires.

Description

technical field

[0001] The invention belongs to the welding wire in the technical field of welding materials, specifically a nickel-based welding wire used for the main equipment of the nuclear island of an AP1000 nuclear power plant, especially a kind of welding wire specially used for reactor pressure vessel welding (including drive pipe seat, takeover safety end, reactor core, etc.) Welding of supporting blocks) and welding of steam generators (including surfacing of tube sheets and welding of tubes and tube sheets). Background technique

[0002] The reactor pressure vessels of nuclear power plants under construction in my country all adopt the second-generation improved technology, while nuclear power technology has been developed to the third generation, and the service life has been increased from 40 years to 60 years, and the safety and economy have been further improved. my country's AP1000 third-generation nuclear power technology is still in the process of introduc...

Images