Stainless steel electrode special for magnesium reduction pot

Abstract

The invention relates to a stainless steel welding rod specially used for the reduction pot in the magnesium industry, which belongs to the field of welding material. The welding rod is formed by mixing the following powder raw materials, adding 2.8M and 48 degree Be potassium sodium water glass which is 25 percent of the total weight of the powder raw materials, and uniformly stirring and coating the materials on the stainless steel core welding-wire through extrusion: according to the part by weight, the powder raw materials comprise 43-52 parts of marble, 16-23 parts of fluorspar, 1-3 parts of white titanium pigment, 1-3 parts of quartz, 1-3 parts of mica, 4-6 parts of ferrosilicon, 3-5 parts of ferrotitanium, 4-6 parts of ferromanganese, 8-12 parts of ferrochrome, 1-3 parts of calcium solvent, 1-3 parts of soda ash, and 8-12 parts of nitrided ferro-chromium; according to the mass percent, the core welding-wire comprises the following chemical compositions: smaller than or equal to 0.15 of C, smaller than or equal to 0.35 of Si, 1.0-2.5 of Mn, smaller than or equal to 0.03 of P, smaller than or equal to 0.015 of S, 8.0-10.0 of Ni, 25.0-28.0 of Cr, smaller than or equal to 0.75 of Mo, smaller than or equal to 0.75 of Cu, and residue of Fe. The welding rod has strong oxidation resistance, sulfidation resistance and corrosion resistance, good crack resistance, high welding efficiency, large electric arc blowing force, and good welding performance; during the welding, the electrode coating is uneasy to turn red and crack, the rest part of the welding rod is short, the slag release is easy in a deep and narrow groove, special equipment is not required, and the cost is low.

Description

technical field [0001] The invention belongs to the field of welding materials, in particular to a special stainless steel welding rod suitable for reduction tanks in the magnesium smelting industry. Background technique [0002] Magnesium alloy is currently an important light metal widely used in various industries. The extraction of metal Mg usually involves placing magnesium-containing ores and reducing agents in a reduction tank, and roasting and reducing them at about 1200°C in a vacuum state. The heating medium is coal or gas, etc. . In the past, the welding of reduction tanks in the magnesium industry usually uses A407 or A402 welding rods for welding. The weld metal can withstand high temperature oxidation at 900-1100 °C. Due to the relatively large wall thickness of the reduction magnesium tank, the restraint stress is large, and thermal cracks are prone to appear in the center of the weld , causing the tank to leak air or the head to fall off during use, making th...

AI Technical Summary

Problems solved by technology

As mentioned above, because most of the electrodes used in the reduction tank are high-chromium-nickel (A407) electrodes, they cannot match the base metal (Table 1 The material of stainless steel tanks used in the magnesium industry, Table 2 The chemical composition of the deposited metal of A407 electrodes), in Hot cracks are prone to appear during the welding process, which reduces the yield

[0003] At the same time, with the rising price of raw materials, especially the rising price of nickel, product cost has become a big problem related to the development of the industry