Nuclear-grade dual-phase stainless steel welding rod for CAP1400 master device

Abstract

The invention discloses a nuclear-grade dual-phase stainless steel welding rod used for welding a nuclear power plant CAP1400 master device. The nuclear-grade dual-phase stainless steel welding rod comprises a low-carbon low-sulfur-phosphorus welding core and a low-hydrogen sodium coating. The low-carbon low-sulfur-phosphorus welding core comprises, by weight, 0-0.015% of C, 1.20%-2.00% of Mn, 0-0.10% of Si, 22.5%-23.5% of Cr, 8.50%-9.50% of Ni, 0-0.015% of Co, 0-0.010% of S, 0-0.015% of P and the balance Fe and impurities. The low-hydrogen sodium coating comprises, by weight, 10%-20% of sodium cryolite powder, 10%-20% of marble powder, 35%-55% of fluorite powder, 0-1% of ferrotitanium powder, 0.5%-1.5% of alginate salt, 1.0%-3.0% of titanium dioxide, 0.3%-0.8% of soda ash, 0-2% of electrolytic manganese, 8%-20% of rutile, 3%-7% of ferrosilicon, 0.5%-1% of ferromolybdenum and sodium silicate binders. According to the nuclear-grade dual-phase stainless steel welding rod used for welding the nuclear power plant CAP1400 master device, electric arcs are stable, a formed welding seam is beautiful, operation is easy, and the deslagging effect and the all-position welding effect are good; deposited metal has good tensile performance and low temperature impact performance.

Description

technical field [0001] The invention relates to the technical field of welding materials, in particular a nuclear-grade duplex stainless steel electrode specially used for welding CAP1400 main equipment of nuclear power plants, which meets the requirements for E2209-15 in GB / T983-2012 and E2209-15 in AWSA5.4-2006. Background technique [0002] According to the national nuclear power development plan, China will need to build about 30 million-kilowatt nuclear power units by 2020. Even so, the proportion of nuclear power generation in China is only 8%, which is far below the level of developed countries. At present, the key equipment of domestic nuclear power The welding consumables used in manufacturing and installation are mainly imported, mainly including Bole, Manchester, ESAB, Lincoln, etc.; domestic welding consumables manufacturers generally start late in the research and development of nuclear power welding consumables and have insufficient technical reserves. Therefore...

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Problems solved by technology

[0002] According to the national nuclear power development plan, China will need to build about 30 million-kilowatt nuclear power units by 2020. Even so, the proportion of nuclear power generation in China is only 8%, which is far below the level of developed countries. At present, the key equipment of domestic nuclear power The welding consumables used in manufacturing and installation are mainly imported, mainly including Bole, Manchester, ESAB, Lincoln, etc.; domestic welding consumables manufacturers generally start late in the research and development of nuclear power welding consumables and have insufficient technical reserves. Therefore, high-quality There is a serious shortage of nuclear power welding materials, which are suitable for CAP1400 passive pressurized water reactor nuclear power reactor pressure vessels, steam generators, voltage stabilizers, core water tanks and other nuclear equipment. Special nuclear-grade duplex stainless steel welding materials mainly rely on imports; at present, Duplex stainless steel welding electrodes at home and abroad are roughly divided into marble fluorite type, titanium calcium type and titanic acid type according to the type of coating. Among them, the marble fluorite type coating electrode has excellent mechanical properties, but poor process performance, large spatter, arc Unstable; titanium-calcium-coated electrode has excellent welding process, small spatter, stable arc, but high porosity sensitivity; although titanium-calcium type has good process performance, its mechanical properties, especially toughness, are not high, and its all-position welding performance is poor The publication number is CN101323058, and the patent name is: a kind of Chinese patent of acid coating super duplex stainless steel electrode and the publication number is CN101817123A, and the patent name is: a kind of coating composition disclosed in the Chinese patent of duplex stainless steel electrode Ti0 2 (rutile, titanium dioxide) and silicate (potassium feldspar, mica) occupy the main body, and the coating type is titanic acid type; the publication number is CN101367161, and the patent name is: a Chinese patent for a low-hydrogen super duplex stainless steel electrode The disclosed coating consists of alkaline compounds (marble, fluorite) as the main body, and the coating type is marble fluorite alkaline coating; the publication number is CN102019518A, and the patent name is: a Chinese patent for a duplex stainless steel electrode In the composition of the disclosed coating, alkaline oxides (calcium oxide, calcium fluoride) occupy the main body, which is also a marble fluorite type coating; from the above, it is necessary to improve the domestic stainless steel electrode preparation process and technology to change At present, the embarrassing situation that special nuclear-grade duplex stainless steel welding consumables in nuclear equipment such as CAP1400 passive PWR nuclear power reactor pressure vessels, steam generators, voltage stabilizers, and core water tanks rely on imports

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