A kind of stainless steel welding electrode used in the main pipeline of third-generation nuclear power and its production method

Abstract

The invention discloses a stainless steel welding electrode used for a third-generation nuclear power main pipeline and a production method of the stainless steel welding electrode, and belongs to the field of welding materials. The stainless steel welding electrode is composed of a chromium-nickel-molybdenum alloy welding core and a coating wrapped on the surface of the welding core, the welding core is composed of smaller than or equal to 0.020wt% of C, 1.00-2.50wt% of Mn, smaller than or equal to 0.30wt% of Si, 18.0-21.0wt% of Cr, 11.0-14.0wt% of Ni, smaller than or equal to 2.00-3.00wt% of Mo, smaller than or equal to 0.050wt% of Co, smaller than or equal to 0.050wt% of Cu, smaller than or equal to 0.010wt% of S, smaller than or equal to 0.015wt% of P and the rest Fe and impurities. Weight of the coating is 30-45% of that of the chromium-nickel-molybdenum alloy welding core. The method includes after uniformly mixing coating powder, adding a binder with the weight being 15-20% that of the coating for uniform mixing, feeding a mixture into a plodder to coat the mixture on the welding core, and subjecting the welding core to low-temperature baking and high-temperature baking. The stainless steel welding electrode has the advantages that content of ferrite in deposited metal is proper, and ferrite number FN of the deposited metal is 5-16; the deposited metal of the welding electrode is excellent in mechanical performance and meets nuclear power requirements; room temperature Rm is larger than or equal to 520Mpa, Rp0.2 is larger than or equal to 205Mpa, and A is larger than or equal to 35.0%; mechanical performance at high temperature of 350 DEG C includes that Rm is larger than or equal to 430Mpa, Rp0.2 is larger than or equal to 125Mpa, and A refers to actual measurement.

Description

technical field [0001] The invention relates to the field of welding materials, in particular to a stainless steel welding electrode for third-generation nuclear power main pipelines and a production method thereof meeting the requirements of AP1000 standard and E316L-16 in the ASME standard. Background technique [0002] The third-generation AP1000 nuclear power main pipeline is the most advanced large-scale thick-walled pressure-bearing pipeline connecting the nuclear power plant reactor pressure vessel, main pump and evaporator in the world today, and it is the most important thing in the construction of the third-generation nuclear power plant. Previously, the AP1000 nuclear power technology successfully developed by Westinghouse Corporation of the United States was recognized as the third-generation nuclear power technology with the best security and the most advanced technology in the world. At present, Chinese enterprises have mastered the core technology of manufactu...

AI Technical Summary

Problems solved by technology

Previously, my country relied entirely on imports of supporting welding materials for nuclear-grade 316LN main pipeline materials. If it cannot be manufactured independently, not only will it have to pay a huge procurement cost, but it also means that my country’s nuclear power development will be controlled by others, and the third-generation nuclear power AP1000 self-reliance process will also It will be hindered, which seriously restricts the implementation of the national nuclear power construction plan