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Stainless steel electrode special for magnesium reduction pot

A technology of stainless steel and reduction tank, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc. It can solve the problems of lower yield, easy occurrence of hot cracks, and inability to match the base metal, etc., to achieve cost reduction, The effect of high welding efficiency and good crack resistance

Active Publication Date: 2010-10-27
BEIJING JINWEI WELDING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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), during welding Hot cracks are prone to appear in the 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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, get marble 43kg, fluorite 16kg, titanium dioxide 1kg, quartz 1kg, mica 1kg, ferrosilicon 4kg, ferrotitanium 5kg, ferromanganese 6kg, ferrochrome 8kg, calcium solvent 1kg, sodium carbonate 3kg, ferrochromium nitride 8kg of powder is mixed evenly, 24.25kg of 2.8M, 48°Be potassium sodium water glass is added to the dry powder and mixed evenly, and then press-coated on the H0Cr26Ni9 stainless steel welding core with a hydraulic press. The chemical composition of the stainless steel welding core is: C: 0.1, Si: 0.25, Mn: 2.0, P: 0.02, S: 0.008, Ni: 9.0, Cr: 27, Mo: 0.1, Cu: 0.1, the electrode is dried naturally for 24 hours, and then dried at high temperature. The chemical composition of the deposited metal after welding is: C: 0.1, Mn: 2.11, Si: 0.67, S: 0.009, P: 0.031, Cr: 26.63, Ni: 7.72, N: 0.19, Mo: 0.08, Cu: 0.13 , The service life of the post-weld reduction tank can reach 80 days (the prior art is 40 days).

Embodiment 2

[0029] Embodiment 2, get marble 52kg, fluorite 23kg, titanium dioxide 3kg, quartz 3kg, mica 3kg, ferrosilicon 6kg, ferrotitanium 3kg, ferromanganese 4kg, ferrochrome 12kg, calcium solvent 3kg, sodium carbonate 1kg, ferrochromium nitride Mix 12kg of powder evenly, add 31.25kg of 2.8M, 48°Be potassium sodium water glass into the dry powder and mix evenly, press-coat it on the H0Cr26Ni9 stainless steel welding core with a hydraulic press, the chemical composition of the stainless steel welding core is: C: 0.1, Si: 0.25, Mn: 2.0, P: 0.02, S: 0.008, Ni: 9.0, Cr: 27, Mo: 0.1, Cu: 0.1, the electrode is dried naturally for 24 hours, and then dried at high temperature. The chemical composition of the deposited metal after welding is: C: 0.1, Mn: 2.05, Si: 0.7, S: 0.009, P: 0.031, Cr: 26.9, Ni: 7.72, N: 0.21, Mo: 0.08, Cu: 0.13 , The service life of the post-weld reduction tank can reach 82 days (the prior art is 40 days).

Embodiment 3

[0030] Embodiment 3, get marble 50kg, fluorite 22kg, titanium dioxide 2kg, quartz 3kg, mica 3kg, ferrosilicon 5kg, ferrotitanium 3kg, ferromanganese 4kg, ferrochromium 11kg, calcium solvent 2kg, sodium carbonate 1kg, ferrochromium nitride Mix 10kg of powder evenly, add 29kg of 2.8M, 48°Be potassium sodium water glass into the dry powder and mix evenly, and apply it on the H0Cr26Ni9 stainless steel welding core with a hydraulic press. The chemical composition of the stainless steel welding core is: C: 0.1, Si : 0.25, Mn: 2.0, P: 0.02, S: 0.008, Ni: 9.0, Cr: 27, Mo: 0.1, Cu: 0.1, the electrode is dried naturally for 24 hours, and then dried at high temperature. The chemical composition of the deposited metal after welding is: C: 0.1, Mn: 2.05, Si: 0.67, S: 0.009, P: 0.031, Cr: 26.88, Ni: 7.72, N: 0.2, Mo: 0.08, Cu: 0.13 , The service life of the post-weld reduction tank can reach 80 days (the prior art is 40 days).

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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 calciumsolvent, 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 to0.15 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/22B23K35/36B23K35/30
Inventor 边境王士山王卫东徐维英陈波
Owner BEIJING JINWEI WELDING MATERIAL
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