Low-hydrogen super diphasic stainless steel electrode

Abstract

The invention discloses a low-hydrogen type super duplex stainless steel welding rod. The prior duplex stainless steel wire is adopted as a welding core. The coating of the welding rod comprises the compositions in percentage by weight: 35 to 45 percent of marble, 20 to 33 percent of fluorite, 0 to 5 percent of titanium pigment, 2 to 5 percent of potassium feldspar, 0 to 2 percent of sodium carbonate, 5 to 15 percent of iron alloy, 10 to 20 percent of metal powder, and 0 to 2 percent of CrN iron, wherein the iron alloy consists of ferrosilicon and ferromolybdenum under the condition of constant total content, and the metal powder consists of manganese metal, chromium metal, and nickel powder under the condition of the constant total content. After raw materials of the compositions of the coating are mixed evenly, pure sodium water glass with certain Baume concentration is added, and the pressing of the welding rod is performed on welding rod production equipment. The use of the welding rod can satisfy the welding need of super duplex stainless steel in the national engineering construction, the welded welding seam has excellent mechanical property and good corrosion resistance, the tensile strength can reach 800MPa, and the welding rod has good low-temperature toughness.

Description

technical field [0001] The invention belongs to welding material technology, in particular to a low-hydrogen super duplex stainless steel welding rod. Background technique [0002] Super duplex stainless steel has high strength, good toughness, excellent corrosion resistance, especially excellent in chloride stress corrosion resistance and pitting corrosion resistance, and also has excellent welding performance, so it has been widely used in corrosion-resistant pressure vessels and pipelines, Construction of corrosion-resistant structures in large chemical tankers and offshore construction facilities. At present, super duplex stainless steel has been widely used in engineering construction in my country, but there is no welding material matching steel in China. Due to the high strength of super duplex stainless steel welding materials, it is difficult to obtain an appropriate ferrite-austenite phase structure ratio. It is very difficult to control and manufacture, so only a ...

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Problems solved by technology

At present, super duplex stainless steel has been widely used in engineering construction in my country, but there is no welding material matching steel in China. Due to the high strength of super duplex stainless steel welding materials, it is difficult to obtain an appropriate ferrite-austenite phase structure ratio. It is very difficult to control and manufacture, so only a few countries can produce at present