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RH injection refining device and application thereof

A refining device and powder spraying technology, which is applied in the field of iron and steel metallurgy, can solve problems such as instability and high difficulty, and achieve the effects of low cost, convenient operation, and enhanced removal efficiency

Active Publication Date: 2010-09-08
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, people mainly control the precipitation and distribution of the second phase particles through controlled rolling and controlled cooling, which is extremely difficult and unstable.

Method used

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  • RH injection refining device and application thereof
  • RH injection refining device and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Drill a hole in the tube wall 1 of the lower part of the RH downcomer, and the number of through hole 2 is 1. The position of the through hole 2 is 400mm away from the lower edge of the RH downcomer. On the outer shell of the chamber, an interface is reserved in the extension part, and the interface is connected to an external air source. The inner diameter of the nozzle 3 is 5mm, and the axial direction of the through hole 2 is at an angle of 30° with the axial direction of the RH downcomer.

[0025] To remove small inclusions in steel, the process is as follows:

[0026] Using an external gas source, Ar gas is injected during net circulation after deoxidation alloying (using Al deoxidation), the injection time is 7-8min, the gas flow rate is 300L / min, and the gas supply pressure is 4.0atm. The blown gas is dispersed into fine bubbles under the impact of the falling molten steel, and the bubbles float up in the ladle, and at the same time collide with and adhere to the...

Embodiment 2

[0028] Drill holes in the tube wall 1 of the lower part of the RH downcomer, and the number of through holes 2 is 2. The position of the through hole 2 is 200mm away from the lower edge of the RH downcomer. The two through holes are distributed along the radial direction of the RH downcomer. The axial angle between the two holes is 60°, the nozzle 3 is introduced into the through hole 2, the nozzle 3 extends outward, and is fixed on the vacuum chamber shell, and the extension part leaves an interface, which is connected to an external air source. The inner diameter of the nozzle 3 is 4mm, and the through hole 2 The axial direction and the axial direction of the RH downcomer form an angle of 45°.

[0029] To remove small inclusions in steel, the process is as follows:

[0030] Using an external gas source, inject Ar gas during the net cycle after the deoxidation alloying (using Al deoxidation), the injection time is 7-8min, the single-tube gas flow rate is 100L / min, and the gas...

Embodiment 3

[0032] Drill holes in the tube wall 1 of the lower part of the RH downcomer, and the number of through holes 2 is 6. The position of the through holes 2 is 150mm away from the lower edge of the RH downcomer. The angle is 60°, the nozzle 3 is introduced into the through hole 2, and the nozzle 3 extends outward, and is fixed on the outer shell of the vacuum chamber. The axial direction of the hole 2 forms an included angle of 60° with the axial direction of the RH downcomer.

[0033] To remove small inclusions in steel, the process is as follows:

[0034] Using an external gas source, inject Ar gas during the net cycle after the deoxidation alloying (using Si deoxidation), the injection time is 6-7min, the single-tube gas flow rate is 50L / min, and the gas supply pressure is 4.0atm. The blown gas is dispersed into fine bubbles under the impact of the falling molten steel, and the bubbles float up in the ladle, and at the same time collide with and adhere to the inclusions to rem...

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Abstract

The invention provides an RH injection refining device and application thereof. The device comprises an RH ascending pipe and an RH descending pipe; pipe walls of the RH ascending pipe and the RH descending pipe are provided with through holes which are connected with an external air supply or a feeding device by spraying pipes. A method of removing small inclusions by using the device comprises:after deoxidation alloying, blowing inert gas into the descending pipe by using the spraying pipes, wherein the gas flow is 10-500L / min and air pressure is 1.0-15atm; or blowing carbonate power into steel liquid, wherein the particle size of the powder is less than 3mm, the feeding rate is 1-100kg / ton steel, the carrier is Ar, N2 or CO2 inert gas, the gas flow is 10-800L / min, and air pressure is 1.0-20atm. The invention has the characteristics of simple equipment, convenient operation, reasonable process, low cost, and good effect. The invention has the advantages of effectively removing small inclusions from steel, regulating alloying elements, manufacturing dispersion steel of small oxide, and achieving the aims of decarburization, desulfurization, dephosphorization, steel slag modification and the like.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to an RH powder spraying refining device and its application technology. Background technique [0002] With the further development of the steel industry, the design of steel materials and the development of application technology have brought great challenges to the metallurgical industry. Iron and steel products will be developed in the direction of high cleanliness of molten steel, high precision of component control and high stability of product performance. The key to improving the quality of steel products and producing high-performance steel products is to improve the purity of molten steel, precisely control the composition of molten steel, and effectively utilize fine inclusions in molten steel. At present, the refining technology of pure steel, the production of fine oxide dispersion steel and the precise control technology of trace alloy ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C7/04C21C7/06C21C7/064C21C7/068
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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