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A kind of resistance wire alloy and its pre-oxidation treatment method

A technology of pre-oxidation treatment and resistance wire, applied in the direction of metal/alloy conductor, metal material coating process, etc., can solve the problem of short life of heating wire, achieve strong corrosion resistance, super insulation performance, and eliminate wrinkles. Effect

Inactive Publication Date: 2017-10-27
上海埃鲁秘工业炉制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of short service life of the electric heating wire used in the aluminum alloy smelting equipment in the prior art, and provide a resistance wire alloy and its pre-oxidation treatment method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Implementation 1, take 24.9 kg of Cr, 5.35 kg of Al, 0.25 kg of Ti, 0.018 kg of C, 0.09 kg of Si, 0.0025 kg of S, 0.51 kg of Y, 0.18 kg of Mo, and 68.6995 kg of Fe.

[0018] The above alloy was smelted in an intermediate frequency vacuum induction furnace, and Y was added under argon protection three minutes before tapping. Dephosphorylation requires P <0.005%.

Embodiment 2

[0019] Implementation 2, take 20 kg of Cr, 5 kg of Al, 0.4 kg of Ti, 0.03 kg of C, 0.1 kg of Si, 0.003 kg of S, 0.6 kg of Y, 0.2 kg of Mo, and 73.667 kg of Fe.

[0020] The above alloy was smelted in an intermediate frequency vacuum induction furnace, and Y was added under argon protection three minutes before tapping. Dephosphorylation requires P <0.005%.

Embodiment 3

[0021] Implementation 3, take 26 kg of Cr, 3 kg of Al, 0.15 kg of Ti, 0.01 kg of C, 0.06 kg of Si, 0.003 kg of S, 0.4 kg of Y, 0.1 kg of Mo, and 70.227 kg of Fe.

[0022] The above alloy was smelted in an intermediate frequency vacuum induction furnace, and Y was added under argon protection three minutes before tapping. Dephosphorylation requires P <0.005%.

[0023] Process the obtained heating wire raw materials into wires, and then carry out pre-oxidation treatment,

[0024] (1) pickling

[0025] Use 8% (mass fraction) of ammonium citrate for the heating wire at 60°C for 40 minutes, wash it with cold water, then put it in an alkaline permanganate bath for 10 minutes, wash it with cold water for 2 minutes, and carry out pickling.

[0026] (2) passivation

[0027] For the electric heating wire after pickling, use the agent HNO3 40%+Na2Cr207H202 4% (mass fraction); temperature 50°C; time 18min; or temperature 28°C; time 30min,

[0028] (3) Pickling for descaling

[0029] ...

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Abstract

The invention designs a resistance wire, which is characterized in that it consists of the following composition and weight percentage: Cr 20——26%, Al 3——6%, Ti 0.15——0.4%, C0.01——0.03%, Si 0.04—0.1%, S 0.002—0.004%, Y0.4—0.6%, Mo0.1—0.2%, Fe balance. A pre-oxidation treatment method for resistance wire, which is characterized in that it consists of the following steps: (1) 5% to 10% (mass fraction) of ammonium citrate for pickling, at a temperature of 60°C, after 40 minutes, wash with cold water, and then Put in alkaline permanganate bath for 10 minutes, then wash in cold water for 2 minutes, (2) passivation agent HNO3 20% ~ 50% + Na2Cr207H20 22% ~ 6% (mass fraction); temperature 49 ~ 54 ℃; time 15 ~ 30min; or Temperature 21~38℃; time 30~60min, (3) descaling pickling agent H2SO48%~11% (volume fraction); temperature 66~82℃; time 5~45min, (4) heating 120-2000C for drying (5) Put pure oxygen into the furnace at 9000C, heat it for 30 minutes and then quickly heat it to 12000C, (6) After holding it for 3 hours, cool it to room temperature with the furnace. The invention has the advantages that the furnace wire after pre-oxidation treatment has uniform and dense oxidation mold, strong anti-corrosion ability and super strong insulation performance. Put an end to the previous oxide film "wrinkle skin" phenomenon.

Description

technical field [0001] The invention relates to a resistance wire alloy and a preoxidation treatment method thereof. Background technique [0002] At present, resistance wires are usually used as heaters in aluminum alloy smelting process equipment, but the life of resistance wires is usually very short. In order to improve its service life, coatings are usually used to protect and achieve insulation. The effect of the heating wire coating is very limited. As a result, aluminum alloy smelting equipment often needs to replace the heating wire, which makes the use efficiency of aluminum alloy smelting equipment very low, resulting in increased production costs. Therefore, it is urgent to improve the material of the existing resistance wire used in aluminum alloy smelting and its pre-oxidation treatment method , to produce a new type of heating wire that meets the production requirements. Contents of the invention [0003] The object of the present invention is to solve the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/28C23G1/08C23C22/24C23C8/14H01B1/02
Inventor 刘荣章
Owner 上海埃鲁秘工业炉制造有限公司
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