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Vacuum treatment technique for molten steel with excellent performance of molten steel casting

A technology of vacuum treatment and molten steel, applied in the field of steelmaking production process, can solve the problems of affecting the effect of circulation, easy adhesion, poor flow of molten steel, etc., and achieve the effect of ensuring the time of deoxidation

Inactive Publication Date: 2007-01-31
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since ultra-low carbon steel has a large amount of O remaining in the steel at the end of decarburization, a large amount of Al is formed in the steel after deoxidation with aluminum shot 2 o 3 , this deoxidized product is solid and moves with molten steel during the RH process, so it will stick and float on the surface of the insertion tube, causing the inner diameter of the insertion tube to become smaller, affecting the effect of further circulation
Moreover, due to the secondary oxidation of molten steel and the reduction of temperature, Al 2 o 3 Inclusions are easy to adhere to the nozzle wall of the ladle during casting, causing poor flow of molten steel and affecting the casting performance of molten steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0032] Examples 1-7 of the molten steel vacuum treatment process with good molten steel casting performance in the present invention. Examples 1-7 of the present invention are the RH vacuum treatment process in the process of BDG production, and the whole process takes 22-25 minutes. Other processes in the process of BDG production, including converter smelting and continuous casting process, remain unchanged. Converter smelting adopts 80t combined blowing converter; RH process equipment is RH-KTB, RH-MFB.

[0033] In Example 1-7 of the present invention, after the molten steel reaches the RH treatment position, temperature measurement and sampling are carried out, RH treatment is started, and the molten steel is decarburized, and the time between 5 minutes after the start of the vacuum treatment process and 5 minutes before the end of the vacuum treatment process is During the period of time, the composite refining agent is put into the vacuum chamber after being weighed by t...

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Abstract

A vacuum treating process for molten steel to improve the casting performance of molten steel features that the composite refining agent prepared from CaO(30-60 Wt%), Al2O3 (10-40) and Al (10-60) is added into vacuum chamber.

Description

technical field [0001] The invention relates to a steelmaking production process, in particular to a molten steel vacuum treatment process in the steelmaking production process. Background technique [0002] In the production process of steelmaking, refining outside the furnace is a refining process between steelmaking and continuous casting, and the vacuum treatment process of molten steel is a means widely used in refining outside the furnace. The molten steel vacuum treatment process mainly includes: vacuum furnace molten steel vacuum treatment process (VOD), double-cycle molten steel vacuum treatment process (RH), single-cycle molten steel vacuum treatment process (DH), etc. The time of the whole molten steel vacuum treatment process is generally 20-40 minutes. [0003] The RH method, also known as the vacuum circulation degassing method, is the most commonly used method for the production of high-quality steel outside the furnace. The metallurgical functions of RH ref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D1/00C21C7/00
Inventor 李具中林立平田义胜王安军陈清泉李刚李建民李凤喜
Owner 武钢集团有限公司