Nickel-based welding electrode matched with 9Ni steel

Abstract

The invention belongs to a nickel-based welding electrode matched with 9Ni steel. A core wire comprises the following components in percentage by weight: more than or equal to 0.02 percent of C, 2.00 to 5.00 percent of Mn, 0.010 to 0.20 percent of Si, 55.0 to 70.0 percent of Ni, 2.50 to 10.00 percent of Fe, 0.05 to 0.30 percent of Cu, 14.00 to 19.00 percent of Cr, 7.00 to 10.00 percent of M, 1.00to 2.50 percent of Nb, 0.001 to 0.010 percent of Co, less than or equal to 0.010 percent of S, less than or equal to 0.020 percent of P and the balance of impurity; a coating comprises the following components 9.0 to 10.5 percent of marble, 7.0 to 8.5 percent of fluorite, 8.0 to 9.5 percent of barium carbonate, 8.0 to 8.5 percent of rutile, 4.0 to 5.0 percent of fluoride, 0.6 to 1.0 percent of ferroniobium powder, 1.2 to 1.5 percent of metal tungsten powder, 0.7 to 1.0 percent of soda ash, and 1.0 to 1.5 percent of electrolytic manganese based on the weight of the core wire; and binder is 20 percent based on the total weight of powder; the components are mixed, and wrapped on the core wire; and the coating and the core wire are baked at low and high temperature. The nickel-based welding electrode has the advantages that: during welding, an electric arc is stable, splashing is avoided basically, slag is detached well, the formed welding joint has an attractive appearance, and the nickel-based welding electrode is good in full-position welding performance; and the nickel-based welding electrode still has good comprehensive performance when used at the temperature of -196 DEG C.

Description

technical field [0001] The invention relates to an electric welding electrode for welding, in particular to a nickel-based electric welding electrode that meets the requirements of ENi6620 in GB / T13814-2008 and is matched with 9Ni steel (also known as Ni9 steel, 9%Ni steel). The electrode is used for welding The 9Ni steel cryogenic equipment still has good comprehensive performance under the condition of -196°C; it can also be used for welding and surfacing of UNS K81340 alloys and other steel types as well as nickel-chromium-molybdenum alloy steel. Background technique [0002] 9Ni steel is a nickel-based alloy steel plate that still has excellent mechanical properties when used at a low temperature of -196°C. Its chemical composition is: Ni: 8.5-9.5%, C: 0005-0.012%, Si: 0.05-0.4 %, Mn: 0.30-0.80%, S≤0.005%, P≤0.008, Mo: 0.05-0.013%, V≤0.01%, the balance is iron and unavoidable impurities; mechanical properties: tensile strength Rm: 680- 820Mpa, yield strength ReH≥570Mpa,...

AI Technical Summary

Problems solved by technology

However, the welding electrodes commonly used for 9Ni steel welding have generally poor mechanical properties of the deposited metal, especially the tensile strength Rm (generally 2 .1.42, Nb.1.37%; mechanical properties of deposited metal: R P0.2 : 410MPa, Rm: 590MPa, A 5 : 36%

Therefore, the chemical composition of the deposited metal does not match the base material (9Ni steel) in the above-mentioned background technology, and the tensile strength and low-temperature impact performance (-196°C kv) are far lower than the base material. It is used for the large-scale low-temperature storage tank of 9Ni steel Welding greatly limits the service performance and service life of large cryogenic storage tanks, and the excellent performance of the base metal cannot be fully utilized.