Intermediate-frequency induction smelting furnace lining

An induction melting furnace and furnace lining technology, applied in the field of refractory materials, can solve the problems of loss of smelters, difficulty in uniform tamping, good thermal shock resistance, etc., and achieves simple construction method, labor saving, and good thermal shock stability. Effect

Inactive Publication Date: 2012-06-13
张君
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Magnesia is a basic refractory material with high refractoriness but poor thermal shock resistance. In the process of smelting high manganese steel, stainless steel, alloy steel and carbon steel, the intermediate frequency induction melting furnace of most manufacturers is smelting Intermittent production causes the intermediate frequency furnace lining made of magnesia to experience frequent rapid cooling and rapid heating changes, which will produce a large number of cracks, which will lead to furnace wear;
[0005] Corundum is a neutral refractory material with high refractoriness and good thermal shock resistance. It will cause great losses to smelters, thus affecting the popularization and use of corundum-based furnace materials
[0006] In the production process of the lining of the intermediate frequency induction melting furnace, the bottom of the crucible bears the static pressure of all the molten steel, especially the corner of the junction between the bottom of the crucible and the wall of the crucible is the weakest link of the whole crucible, because the thickness of the crucible sand here varies greatly , the heat dissipation conditions are different, it is not easy to pound evenly when knotting, and sintering cracks are easy to occur at the corners, resulting in steel breakout, so higher knotting quality is required

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 (smelting ZGMn13 high manganese cast steel):

[0024] A medium frequency induction melting furnace lining, the main component mass percentage of the material used is: Al 2 o 3 20%, MgO 55%, ZrO 2 Accounted for 8%, Cr 2 o 3 It accounts for 15%, and the rest is impurities; the particle size ratio of the materials used is: 3-6mm accounts for 30%, 1-3mm accounts for 15%, 0-1mm accounts for 15%, and 200 mesh accounts for 40%; the materials are dry mixed according to requirements Fully even.

[0025] Such as figure 1 , figure 2 As shown, the knotting and knotting of the crucible of the intermediate frequency induction melting furnace includes the following structures: pit 1, hard sand layer 2, copper induction coil 3, dust-free asbestos cloth 4, furnace bottom 5, crucible wall 6, furnace collar And furnace mouth 7.

[0026] The construction and use method of the above-mentioned intermediate frequency induction melting furnace lining is as follows:

[00...

Embodiment 2

[0042] Example 2 (melting 304 stainless steel):

[0043] A medium frequency induction melting furnace lining, the main component mass percentage of the material used is: Al 2 o 3 Accounted for 23%, MgO accounted for 50%, ZrO 2 Accounting for 5%, Cr 2 o 3 It accounts for 20%, and the rest is impurities; the particle size ratio of the materials used is: 3-6mm accounts for 30%, 1-3mm accounts for 20%, 0-1mm accounts for 15%, and 200 mesh accounts for 35%; the materials are dry mixed according to requirements Fully even.

[0044] The method of construction and use of the above-mentioned intermediate frequency induction melting furnace lining is the same as that of Example 1.

[0045] The above-mentioned intermediate frequency induction melting furnace lining, the inspection results are as follows:

[0046] 1. After knotting the lining of the intermediate frequency induction melting furnace, pull out the iron core, and find that the bottom and wall of the furnace are smooth, ...

Embodiment 3

[0053] Embodiment 3 (smelting 45# carbon steel):

[0054] A medium frequency induction melting furnace lining, the main component mass percentage of the material used is: Al 2 o 3 20%, MgO 52%, ZrO 2 Accounted for 10%, Cr 2 o 3 It accounts for 16%, and the rest is impurities; the particle size ratio of the materials used is: 3-6mm accounts for 25%, 1-3mm accounts for 18%, 0-1mm accounts for 20%, and 200 mesh accounts for 37%; the materials are dry mixed according to requirements Fully even.

[0055] The method of construction and use of the above-mentioned intermediate frequency induction melting furnace lining is the same as that of Example 1.

[0056] The above-mentioned intermediate frequency induction melting furnace lining, the inspection results are as follows:

[0057] 1. After knotting the lining of the intermediate frequency induction melting furnace, pull out the iron core, and find that the bottom and wall of the furnace are smooth, clean and dense, without ho...

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Abstract

The invention provides an intermediate-frequency induction smelting furnace lining which comprises the following main components in percentage by mass: 20-25% of Al2O3, 50-55% of MgO, 5-10% of ZrO2, 15-20% of Cr2O3 and the balance of impurity. The material is prepared from the following components in the following particle sizes: 25-30% of 3-6mm component, 15-20% of 1-3mm component, 15-20% of 0-1mm component and 35-40% of 200-mesh component. The invention is suitable for an intermediate-frequency induction smelting furnace lining for smelting high manganese steel, stainless steel, alloy steel and carbon steel. The intermediate-frequency induction smelting furnace lining has the advantages of high refractory temperature, favorable alkali resistance, favorable neutral and weakly acidic slag corrosion resistance, long service life and high cost performance.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to an intermediate frequency induction melting furnace lining used in melting high manganese steel, stainless steel, alloy steel and carbon steel. Background technique [0002] In industrial production, most of the furnace linings of intermediate frequency induction melting furnaces for melting high manganese steel, stainless steel, alloy steel and carbon steel are made of quartz sand, magnesia and corundum. The advantages and disadvantages are roughly as follows: [0003] Quartz sand is an acidic refractory material, which has good thermal shock resistance, but its refractoriness is low, and it cannot withstand high-temperature smelting of high manganese steel, stainless steel, alloy steel, carbon steel, etc., and SiO 2 Manganese silicate is produced by chemical reaction with basic manganese elements, so the furnace lining made of quartz sand will be severely corroded and melted...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 张君
Owner 张君
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