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A method for improving the castability of medium and low carbon steel molten steel

A low-carbon steel and molten steel technology, applied in the field of iron and steel metallurgy and continuous casting, can solve the problems of increasing production costs, etc., and achieve the effect of improving the castability of molten steel and alleviating nozzle clogging

Inactive Publication Date: 2011-12-07
PANZHIHUA IRON AND STEEL +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to overcome the above problems, in the prior art, methods such as calcium treatment are used to treat high melting point Al 2 o 3 Denaturing the inclusions of the system to transform them into Al with a low melting point 2 o 3 Inclusions, so as to improve the pourability of molten steel, but this method increases the production cost

Method used

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  • A method for improving the castability of medium and low carbon steel molten steel

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Experimental program
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Effect test

Embodiment 1

[0048] B steel is smelted using a 120t converter, argon blowing after tapping, LF ladle furnace refining, and Φ200mm round billet continuous casting. Usually, the aluminum content [Al] in the finished steel product is less than 0.01% by weight, and the finished product [C ] content by weight percentage is 0.17% to 0.22%, using silicon calcium barium deoxidation.

[0049] The sulfur content of the molten iron blended into the converter is 0.010%, and the [C] content of the converter smelting end point is 0.06%. When the steel is tapped to about 30%, 3.5kg / ton of steel is added as a deoxidizer to deoxidize the molten steel. Add 7.0kg / ton of steel ferromanganese and 0.8kg / ton of steel carburizer to carry out alloying and carburization of molten steel, and add 4kg / ton of active lime and 0.8kg / ton of steel to the ladle when tapping reaches about 31%. Fluorite of 1 ton of molten steel, then refined by blowing argon to the molten steel in the ladle for 10 minutes at a small flow rate...

Embodiment 2

[0053] 45 steel is smelted by using a 120t converter, argon blowing after tapping, LF ladle furnace refining, and continuous casting of 200×200mm billets. Usually, the aluminum content [Al] in the finished steel product is less than 0.01% by weight, and the finished product The [C] content is 0.42% to 0.50% by weight, and is deoxidized by silicon calcium barium.

[0054] The sulfur content of the molten iron blended into the converter is 0.015%, and the [C] content at the end point of converter smelting is 0.09%. When the steel is tapped to about 20%, 2.0kg / ton of steel calcium calcium barium is added as a deoxidizer to deoxidize the molten steel, and add 3.0kg / ton of ferrosilicon, 7.0kg / ton of ferromanganese and 4.0kg / ton of carburizing agent for molten steel alloying and carburizing, adding 5kg / ton to the ladle when the steel reaches about 50% Active lime for steel, 1.0kg / ton of fluorite for steel, feed aluminum wire 0.10kg / ton of steel into the molten steel after tapping, a...

Embodiment 3

[0058] Q195 steel is smelted by using a 120t converter, argon blowing after tapping, LF ladle furnace refining, and 200×200mm billet continuous casting process. Usually, the aluminum content [Al] in the finished steel product is less than 0.01% by weight, and the finished product [C ] content is calculated as 0.07% to 0.11% by weight percentage, and silicon calcium barium is used for deoxidation.

[0059] The sulfur content of the molten iron blended into the converter is 0.010%, and the [C] content at the end of the converter smelting is 0.05%. When the steel is tapped to about 25%, 3.8kg / ton of steel is added with silicon calcium barium as a deoxidizer to deoxidize the molten steel. When the steel reaches about 40%, add 3.0kg / ton of active lime and 0.6kg / ton of steel fluorite to the ladle, and feed 0.30kg / ton of aluminum wire into the molten steel after tapping, and then carry out argon blowing and refining. Blow argon at a small flow rate in the ladle for 10 minutes to full...

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Abstract

The invention provides a method for improving castability of molten steel of medium and low carbon steel. The method comprises the following steps: controlling the content of sulfur in the molten steel to be less than or equal to 0.015%; primarily smelting molten iron so as to form molten steel, and then tapping the molten steel to a steel ladle; in the process of tapping 20%-30% by weight of molten steel, adding a proper amount of deoxidant which basically dose not contain aluminum or dose not contain aluminum according to the content of oxygen in the molten steel at the terminal point of primary smelting; in the process of tapping 31%-50% by weight of molten steel, adding 3.0-5.0Kg of active lime in each ton of steel and adding fluorite the adding amount of which is 20% of that of active lime; carrying out first argon-blowing refining; refining in the steel ladle furnace and carrying out secondary argon-blowing refining; and casting by using a continuous casting process. In the method, calcium treatment is not needed so as to effectively improve the castability of the molten steel; a water gap blocking phenomenon is relieved; and the number of middle ladle continuous casting furnaces in the continuous casting process of the middle and low carbon aluminum with low aluminum content is not less than 8, thereby achieving the purpose of economic production.

Description

technical field [0001] The invention relates to the technical fields of iron and steel metallurgy and continuous casting, and more specifically relates to a method capable of increasing the number of continuous casting furnaces for medium and low carbon steel. Background technique [0002] In the prior art, in the technological process of adopting the continuous casting process to cast medium and low carbon steel, due to the high melting point aluminum oxide (Al 2 o 3 ) series inclusions and calcium silicate (CaSiO 3 ) and other inclusions are easy to adhere to the inner wall of the submerged nozzle of the crystallizer, causing it to be blocked, so the number of continuous casting furnaces per tundish is relatively low (for example, less than 6 furnaces), the production cost increases, and the production organization is greatly affected. big impact. Especially the casting section is small (for example, the section is not more than 40000mm 2 ) of the continuous casting sl...

Claims

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Application Information

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IPC IPC(8): C21C7/064C21C7/06C21C7/072B22D1/00
Inventor 陈亮陈天明陈永曾建华杨森祥李桂军李清春雷辉寄海明郭奠荣
Owner PANZHIHUA IRON AND STEEL
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