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Method for removal of aluminum oxide inclusion from molten steel in refining process

A technology of aluminum oxide and refining process, applied in the field of steelmaking process, can solve the problems of clogging, ineffectiveness, removal of inclusions, etc., and achieve the effects of simple process, low cost and content reduction

Inactive Publication Date: 2015-12-23
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 3. The number of pores in the ceramic filter is limited during use, and it will be blocked quickly, losing the ability to remove inclusions, so the filtering effect on large particle inclusions is also very limited
[0007] For example: CN03230562.1 and CN92108959.7 patents, both cannot effectively remove inclusions with a size below 50 μm, because the cleaner heats up rapidly during use, and does not have the ability to absorb small particle inclusions
In addition, there are also problems such as the high cost of ceramic filters
[0008] Therefore, the existing methods basically do not have the ability to remove inclusions in molten steel whose inclusions are mainly small particles
At present, due to the progress of refining technology, most of the inclusions in molten steel during pouring are small particle inclusions. Therefore, there is no effective and easy-to-implement method for removing inclusions in molten steel so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Preparation of Al with a particle size of 1.5-2.0mm 2 o 3 pellets.

[0025] 2. Use a steel plate with a thickness of 0.15mm, roll it into a cored wire with a diameter of 10mm, and Al 2 o 3 The pellets are encapsulated into the cored wire.

[0026] 3. The amount of molten steel treated by LF is 100 tons, and after the molten steel is treated by LF, Al is fed into the molten steel 2 o 3 The cored wire is 90m.

[0027] The rest are treated with molten steel according to the normal process until casting.

[0028] The molten steel Al after embodiment 1 process 2 o 3 The inclusion content is reduced to 0.0018%, and the normal process of processing molten steel Al 2 o 3 The content of grain inclusions is 0.0040%, a decrease of 0.0022%.

Embodiment 2

[0030] 1. Preparation of Al with a particle size of 2.0-3.0mm 2 o 3 pellets.

[0031] 2. Use a steel plate with a thickness of 0.1mm to make a cylindrical tin can with a diameter of 25mm and a height of 25mm. Al 2 o 3 The pellets are packaged in tin cans.

[0032] 3. Put the tin can into the feeding bin of the RH equipment.

[0033] 4. The amount of liquid steel treated by RH is 260 tons, Al 2 o 3 The quality of pellets added is 0.08% of the total mass of the RH-treated molten steel, a total of 208kg; after the RH treatment starts, when the vacuum reaches 100Pa, add Al 2 o 3 For the tin cans of pellets, the amount added in each batch is 26kg, and the interval between batches is 3min.

[0034] After the RH treatment, the molten steel is processed according to the normal process until casting.

[0035] Al in the molten steel after the treatment of embodiment 2 2 o 3 The inclusion content is reduced to 0.0012%, and the normal process of processing molten steel Al 2 o ...

Embodiment 3

[0037] 1. Preparation of Al with a particle size of 1.5-2.0mm 2 o 3 pellets.

[0038] 2. Use a steel plate with a thickness of 0.2mm to roll it into a cored wire with a diameter of 15mm, and Al 2 o 3 The pellets are encapsulated into the cored wire.

[0039] 3. The amount of molten steel treated by CAS-OB is 180 tons. After the molten steel is treated by CAS-OB, Al is fed into the molten steel 2 o 3 The cored wire is 170m.

[0040] The rest are treated with molten steel according to the normal process until casting.

[0041] Al in the molten steel after the treatment of embodiment 3 2 o 3 The content of grain inclusions is reduced to 0.0015%, and the normal process of processing molten steel Al 2 o 3The grain inclusion content is 0.0038%, which is 0.0023% lower.

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Abstract

The invention provides a method for removal of an aluminum oxide inclusion from molten steel in a refining process. According to the method, well prepared Al2O3 particles with a particle size of 1.0-4.0mm are loaded into iron sheet tanks made by sheet steel, in a molten steel refining process, the Al2O3 particle loaded iron sheet tanks are added in batches to a feeding port, and the adding amount accounts for 0.01-0.3% of the total mass of the molten steel subjected to refining treatment. Or, well prepared Al2O3 particles with a particle size of 1.0-4.0mm are loaded into cored wires made by sheet steel, and in the molten steel refining process, the Al2O3 cored wires are fed to the molten steel. The method provided by the invention can quickly and effectively reduce the content of Al2O3 and other inclusions in the molten steel to purify the molten steel. The molten steel treated by the method has an Al2O3 particle inclusion content averagely controlled at about 0.0015%, which is reduced by 0.0021% than the Al2O3 particle inclusion content of previous molten steel treated by a normal process. Also, the method has a simple process, has no need for additional making of equipment and apparatuses, and is low in cost.

Description

technical field [0001] The invention belongs to the field of steelmaking technology, in particular to a method for deeply removing aluminum oxide inclusions in molten steel during the refining process. Background technique [0002] Contains Al in molten steel 2 o 3 For inclusions with high melting point, the size of most of the inclusions is less than 50 microns, and such small-sized inclusions are not easy to float. Although various methods are used in refining, the content of inclusions in molten steel is usually high, which seriously reduces the performance of the steel, and even makes the steel scrap. Especially for some steel types that have very strict requirements on the type and content of inclusions, the control of inclusions is particularly difficult. Therefore, how to reduce the content of inclusions in molten steel to an ideal level has always been the main research work of metallurgists. [0003] At present, the removal of Al from molten steel 2 o 3 The me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/04
Inventor 黄玉平唐雪峰郭庆涛贾吉祥廖相巍常桂华
Owner ANGANG STEEL CO LTD