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Method for reducing titanium inclusion of molten steel

A technology for inclusions and molten steel, applied in the field of iron and steel smelting, can solve the problems of large number of titanium inclusions, large size of titanium inclusions, deterioration of the quality of cord steel products, etc. The effect of pull-out and fatigue resistance

Active Publication Date: 2009-11-25
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the problems that the residual titanium inclusions in the molten steel are large in size and large in number after the above-mentioned cord steel is refined to remove inclusions, which leads to a decrease in product quality when the cord steel is drawn. inclusion method

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  • Method for reducing titanium inclusion of molten steel

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Embodiment Construction

[0012] The technical solutions of the present invention will be described in detail below in conjunction with specific embodiments of the present invention.

[0013] The feature of the present invention is that, after the production and refining treatment of the cord steel is completed, argon is blown at the bottom of the ladle and argon is blown in the process of pouring steel into the ladle.

[0014] According to the specific actual production requirements, after the refining treatment, the ladle is in the waiting position to blow argon to the bottom of the ladle, and the argon flow rate is controlled at 0.3×10 -3 ~4×10 -3 N m 3 In the range of / min·t, the flow control of argon blowing is divided into two stages, and the flow of argon blowing in the first stage is controlled at 10 -3 ~4×10 -3 N m 3 / min·t, the time is 10~30min; the flow rate of argon blowing in the second stage is controlled at 0.3×10 -3 ~10 -3 N m 3 / min·t; the time is 10~30min.

[0015] Argon blowi...

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Abstract

The invention discloses a method for reducing titanium inclusion of molten steel, which is characterized in that: a ladle wait bit is subject to the bottom blowing argon after cord wire steel is refined and the blowing argon is performed during the steel casting of the ladle; a ladle is subject to the blowing argon by two states during the wait bit, the flow of argon is controlled within 0.3*10 to 4*10Nm / min. t; the blowing argon is performed during the steel casting of the ladle, the maximum flow of the argon is 1.5*10Nm / mim. t, and the flow change of the blowing argon is decreased according to the casting weight of the ladle through the formula Y being equal to (1.5*10 to 3*10.X)Nmmin. t. Because the ladle is subject to the bottom blowing argon by using the wait bit and the blowing argon is performed during the steel casting of the ladle, the invention further removes titanium and other inclusions of the molten steel, improves the purity of the molten steel, balances the ingredients and the temperature in steel, and reduces the granularity of the titanium inclusion and other friable oxide inclusions in the cord wire steel, thereby meeting the requirements of the production process of the cord wire steel and improving the drawing property and the fatigue resistance of the cord wire steel.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, in particular to a method for reducing titanium inclusions in molten steel during the cord steel refining process. Background technique [0002] In the production process of cord steel, in order to increase ductility and strength, elements such as silicon and manganese are added in the smelting process when necessary, but titanium elements cannot be avoided due to alloys and raw materials in the smelting process. Nitrogen, carbon, oxygen and other elements react to form inclusions in the steel. Although some inclusions can be removed by argon blowing during ladle refining, it is difficult to remove titanium inclusions due to their small particles and small quantities during refining. Because in the process of cord steel drawing, if there are inclusions larger than 10μm inside the steel, it will cause fracture, especially Ti inclusions in steel, which exist in steel in various form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/072
Inventor 张晓军宁东仉勇曹维华原丽君臧绍双
Owner ANGANG STEEL CO LTD
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