A martensitic heat-resistant steel wire with high impact performance for fourth-generation nuclear power and its welding process

Abstract

The invention discloses a martensite heat-resisting steel welding wire having the high impact property and used for the fourth-generation nuclear power and a welding technology of the martensite heat-resisting steel welding wire, and belongs to the technical field of welding materials. The welding wire includes, by weight percent, 0.1%-0.2% of C, 8.0%-12.0% of Cr, 1.0%-3.0% of W, 0.15%-0.35% of V, 0.05%-0.25% of Ta, 0.5%-1.8% of Mn, 0.05%-0.35% of Al, 0.2%-0.6% of Si, smaller than or equal to 0.1% of Ti and the balance Fe. Due to the fact that the welding wire is subjected to microalloying, weld metal has the beneficial effect of being good in toughness, the room-temperature impact energy of deposited metal in the annealing state can reach 125 J-170 J, the yield strength ranges from 500 MPa to 650 MPa, the tensile strength ranges from 700 MPa to 800 MPa, the elongation percentage is larger than or equal to 20%, and the section reduction percentage is larger than or equal to 60%. Compared with the prior art, the comprehensive mechanical performance of the martensite heat-resisting steel weld metal is obviously improved.

Description

technical field [0001] The invention relates to the technical field of welding materials, in particular to a fourth-generation nuclear power martensitic heat-resistant steel welding wire with high impact performance and a welding process thereof. The welding wire is suitable for fourth-generation nuclear power accelerator-driven subcritical / lead-cooled fast reactors ( Welding of martensitic heat-resistant steel with ADS / LFR) structure. Background technique [0002] The accelerator-driven subcritical system (ADS) is recognized as one of the most promising transmutation technologies in the world. It uses the proton beam generated by the accelerator to bombard the heavy metal spallation target (such as liquid lead or lead-bismuth alloy) in the subcritical reactor. cause spallation reaction. Martensitic heat-resistant steel has the advantages of resistance to high-energy neutron radiation and good high-temperature performance, and is considered to be a candidate structural mate...

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Problems solved by technology

[0005] In order to overcome the problems of low impact energy of martensitic heat-resistant steel welding wire in the prior art, the present invention provides a fourth-generation nuclear power martensitic heat-resistant steel welding wire with high impact performance and its welding process. Microalloying to improve the comprehensive mechanical properties, high temperature resistance, Pb-Bi corrosion resistance and radiation swelling resistance of the weld metal

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