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Production method of fine oxide dispersed steel

An oxide and fine technology, applied in the field of metallurgy, can solve the problems of difficult to control particle dispersion, high equipment requirements, powder spraying and oxygen can not be carried out at the same time, etc., to achieve the effect of low production cost, simple process and reliable equipment

Inactive Publication Date: 2011-08-10
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also reports in the literature that the powder spraying process is used. At present, the RH-PTB method is more widely used, that is, the top blowing powder spraying method. Oxygen blowing cannot be carried out at the same time
Although the injection method used above can introduce particles into molten steel, it is difficult to control the dispersion of particles in molten steel

Method used

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  • Production method of fine oxide dispersed steel
  • Production method of fine oxide dispersed steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Drill holes on the tube wall 1 at the lower part of the RH downcomer, and there is one through hole 2, and the axial direction of the through hole 2 forms an included angle of 30° with the RH downcomer axis. The position of the through hole 2 is 300mm away from the lower edge of the RH downcomer. The through hole 2 leads into the nozzle 3, which extends outward and is fixed on the outer shell of the vacuum chamber. The powder equipment is connected, and the inner diameter of the spray pipe 3 is 5mm.

[0020] The production method of fine oxide dispersion steel is as follows:

[0021] [1] During the RH refining and deoxidation process of molten steel, use the above-mentioned powder feeding equipment to blow argon gas, and use the bubbles to float, collide, grow and capture to remove the deoxidized products with larger particles in the molten steel, thereby removing the deoxidized products produced in the refining process Deoxidation products, reducing the total oxygen c...

Embodiment 2

[0024] Drill holes on the tube wall 1 at the lower part of the RH downcomer. There are two through holes 2 arranged in a longitudinal arrangement. The axial direction of the through holes 2 forms an included angle of 45° with the RH downcomer axis. The position of the through hole 2 is 300mm and 350mm from the lower edge of the RH descending pipe respectively. The through hole 2 is introduced into the nozzle 3, which extends outward and is fixed on the outer shell of the vacuum chamber. Or connect with purchased powder feeding equipment, the inner diameter of the nozzle 3 is 6mm.

[0025] The production method of fine oxide dispersion steel is as follows:

[0026][1] During the RH refining and deoxidation process of molten steel, use the above-mentioned powder feeding equipment to spray low melting point pre-slag powder (pre-slag powder composition weight percentage is CaO: 50%, Al 2 o 3 : 20%, SiO 2 : 10%, MgO: 10%, CaF 2 : 10%), the particle size of the powder is <100 μm...

Embodiment 3

[0029] Drill holes on the tube wall 1 of the lower part of the RH downcomer. The number of through holes 2 is two and distributed horizontally and symmetrically. The axial direction of the through holes 2 forms an included angle of 60° with the RH downcomer axis. The position of the through hole 2 is 400mm away from the lower edge of the RH downcomer. The through hole 2 leads into the nozzle 3, which extends outward and is fixed on the outer shell of the vacuum chamber. The powder equipment is connected, and the inner diameter of the spray pipe 3 is 6mm.

[0030] The production method of fine oxide dispersion steel is as follows:

[0031] [1] During the RH refining and deoxidation process of molten steel, the above-mentioned powder feeding equipment is used to inject CaCO 3 Powder, the particle size of the powder is less than 100μm, the injection powder dose is 100kg, and the powder delivery rate is 5-20kg / min. It mainly uses the decomposition of carbonate to produce a large...

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Abstract

The invention provides a production method of fine oxide dispersed steel. The production method is characterized by comprising the following steps of: forming a through hole in the lower pipe wall of an RH (Ruhrstahl-Heraeus) downcomer, connecting the through hole with an external gas source or powder feeding equipment through a spray pipe, blowing inert gas into molten steel through the spray pipe in an RH molten steel refining and deoxidizing process or removing an oxygen product by blowing deoxidation powder by taking the inert gas serving as a carrier; and spraying useful alkali soil powder by taking the inert gas as a carrier or spraying useful oxide mass points to generate fine dispersed oxides and keeping clean circulation for less than 10 minutes after bellowing, wherein the inert gas is Ar, N2 or CO2 with the air flow of 10-1,000 L / min and the air pressure of 1.0-15 atm. The production method has a simple process and low production cost. By adopting the production method, a large amount of fine oxide dispersed steel with the oxide particle size being less than 1 mum can be produced stably and quickly.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method for stably increasing fine oxides in molten steel during the RH refining process. Background technique [0002] It is well known that the beneficial inclusions (CaO, Ti 2 o 3 , BN, REM (O, S), VN, TiN, ZrO 2 etc.) can improve the quality of molten steel. In recent years, inclusions with a particle size of less than 1 μm, especially the dispersion technique using oxide-based inclusions, have attracted attention. Several patents describe production methods for oxide-dispersed steels. One is to use traditional smelting to control deoxidation, and the other is to introduce fine particles into molten steel by spraying to achieve dispersion strengthening. [0003] The traditional controlled deoxidation method, such as in the patent document JP 2001-288509, controls the oxygen in the molten steel at 20-80ppm, and then adds Ti, Al and Ca in sequenc...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C7/04C21C7/06C21C7/072C22C33/04
Inventor 唐复平李镇王晓峰陈本文姜振生费鹏吴春杰栗红康伟金学峰袁皓孙群孙涛林洋辛国强
Owner ANGANG STEEL CO LTD
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