Special welding rod for on-site welding main steam pipe in nuclear power station

Abstract

The invention discloses a special welding rod for on-site welding a main steam pipe in a nuclear power station. The deposited metal comprises the following elements, by optimal contents, less than or equal to 0.12 wt% of C, less than or equal to 0.70 wt% of Si, less than or equal to 1.00 wt% of Mn, less than or equal to 0.020 wt% of P, less than or equal to 0.020 wt% of S, less than or equal to 0.20 wt% of Ni, 1.20 to 1.50 wt% of Cr, less than or equal to 0.65 wt% of Mo, and less than or equal to 0.35 wt% of Cu. Compared with the prior art, the chemical compositions of the deposited metal of the special welding rod for an on-site welding main steam pipe in a nuclear power station are similar to those of SA335P11 main steam pipe steel, the mechanical properties of the welding rod are better than or equal to a present E5015 welding rod, the anti-FAC performance of a weld joint of an SA335P11 main steam pipe welded by the welding rod is greatly raised, the quality of the weld joint of the main steam pipe in the nuclear power station can be ensured during operation, so the weld rod is significant for safety operation of a nuclear power unit.

Description

technical field [0001] The invention relates to a special welding material for on-site welding of a main steam pipeline of a nuclear power plant, in particular to a special welding rod capable of significantly reducing the corrosion rate of FAC. Background technique [0002] The temperature of the medium in the main steam delivery pipe of the secondary circuit of the nuclear island of the nuclear power plant is high, the flow velocity is fast, and the flow rate is large (about 1.7 to 1.9 times that of thermal power), which will cause "fluid accelerated corrosion ( FAC)" phenomenon, that is, the inner surface of carbon steel pipe is washed by a large amount of high-speed flowing steam, and the protective oxide film on the inner wall falls off and becomes thinner, which makes the steel matrix worse and the annual corrosion rate increases. When the fluid accelerated corrosion phenomenon is serious, it may cause a pipe burst accident, so it is necessary to improve the anti-steam...

AI Technical Summary

Problems solved by technology

It can be seen from Table 3 that the chromium content in the deposited metal of E5015 electrode is very small, which cannot meet the welding requirements of SA335P11 steel

Images