Electric welding rod for high-manganese austenite low-temperature steel

Abstract

The invention discloses an electric welding rod for high-manganese austenite low-temperature steel. The electric welding rod is composed of a high-manganese welding core and a coating, wherein the surface of the welding core is coated with the coating. The total weight of the high-manganese welding core is adopted as the reference, and the high-manganese welding core comprises, by weight percentage, 0.20-0.50% of C, 0.15-0.45% of Si, 23.0-30.0% of Mn, 4.0-8.0% of Cr, less than or equal to 0.008% of S, less than or equal to 0.010% of P and the balance Fe and inevitable impurities. The total weight of the coating is adopted as the reference, and the coating comprises, by weight percentage, 45-52% of marble, 25-30% of fluorite, 2-7% of quartz, 3-5% of feldspar, 2-4% of titanium dioxide, 2-7%of rutile, 4-8% of manganese metal, 1-3% of rare earth and silicon iron, 2-5% of ferrotitanium and 1-2% of sodium carbonate. After all power materials are uniformly mixed according to the ratios, sodium-potassium water glass with the weight accounting for 23-29% the weight of the powder materials is added as a binding agent, and the powder materials are pressed onto the welding core; and the weight coefficient of the coating ranges from 0.35% to 0.45%. The electric welding rod meets the requirement for toughness in the environment with the low temperature being minus 196 DEG C so that the problems that existing high-manganese welding rods are poor in structure stability and insufficient in low-temperature toughness can be solved, and the domestic blank is filled up.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to an electric welding electrode for high-manganese austenitic low-temperature steel. Background technique [0002] In the face of huge environmental protection pressure, the demand for clean energy such as liquefied natural gas (LNG) and liquefied petroleum gas (LPG) in various countries is increasingly strong, which promotes the rapid development of the LNG storage and transportation market. At present, the materials used for LNG storage tanks mainly include Invar alloy, 9Ni steel, aluminum alloy and austenitic stainless steel, among which 9Ni steel is the most widely used. Although this type of material has good low-temperature performance, it has problems such as high cost and low strength. In order to reduce the construction cost of LNG storage tanks and improve market competitiveness, domestic and foreign iron and steel enterprises are actively developin...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above technical problems, the present invention provides a high-manganese austenitic low-temperature steel welding electrode, which meets the toughness requirements of -196 ° low-temperature environment, to solve the problems of poor structure stability and low-temperature toughness of existing high-manganese welding rods, and to fill Domestic blank

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