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LF furnace smelting method for improving continuous casting castability of low-silicon molten steel

A smelting method and technology for molten steel are applied in the field of LF furnace smelting for improving the castability of low-silicon molten steel, which can solve the problems of difficult control of billet inclusions, high content of aluminum deoxidation products, affecting the castability of molten steel, etc. The effect of slag forming time, increasing the amount of lime washing of converter slag, and reducing inclusions

Pending Publication Date: 2020-12-25
新余钢铁股份有限公司
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Problems solved by technology

However, because of the low silicon content in molten steel, the aluminum deoxidation product Al in molten steel 2 o 3 The content must be high
Al in molten steel 2 o 3 High content will inevitably affect the pourability of molten steel, and the inclusions in the billet are also difficult to control

Method used

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Examples

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Embodiment 1

[0028] An LF furnace smelting method for improving the castability of low-silicon molten steel. The low-silicon steel produced in Example 1 is JB380CL-2, and the chemical composition of the steel is: C: 0.08-0.11%, Mn: 0.75 -0.9%, S≤0.007%, P≤0.016%, Si≤0.05%, Als: 0.025-0.05%, the balance is Fe and unavoidable impurities; the process method adopted is the following steps:

[0029] 1) Slagging and desulfurization of molten iron. After slag removal, the bright surface of molten iron is >95%, and the sulfur content of molten iron is 0.006%. Scrap steel is low-sulfur high-quality scrap steel.

[0030] 2) The slag is blocked by the converter sliding plate and the steel is released without slag. When the steel is discharged to 1 / 4, 800kg of slag is added to wash the lime, and the reaction between the steel slag is increased by using the good dynamic conditions of the steel discharge.

[0031] 3) After the LF furnace molten steel arrives at the station, add 600kg of lime, 100kg of f...

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Abstract

The invention provides an LF furnace smelting method for improving the continuous casting castability of low-silicon molten steel. Compared with the prior art, the LF furnace smelting method has the following advantages that the lime washing amount of converter slag is increased, and the slagging time of the LF furnace is shortened; the slag is deeply deoxidized by adding a molten steel purifyingagent, so that the problem of high oxygen content of low-silicon molten steel slag is solved; secondary oxidation of the low-silicon molten steel and slag is effectively avoided by adjusting the dustremoval opening degree in the soft blowing process; and finally, the flowability of the smelted low-silicon molten steel in continuous casting is improved, and inclusions in the steel are remarkably reduced.

Description

technical field [0001] The invention relates to the technical field of LF refining outside the furnace, in particular to an LF furnace smelting method for improving the castability of low-silicon molten steel continuous casting. Background technique [0002] The LF furnace smelts low-silicon steel by adding aluminum particles to deoxidize the slag, adding a large amount of lime to increase the alkalinity of the slag, removing oxygen and sulfur in the steel by argon stirring, and adding alloys to make the composition of molten steel meet the requirements. However, because of the low silicon content in molten steel, the aluminum deoxidation product Al in molten steel 2 o 3 The content must be high. Al in molten steel 2 o 3 If the content is high, it will inevitably affect the pourability of molten steel, and the inclusions in the billet are also difficult to control. Therefore, it is especially important to develop a method for smelting low-silicon steel in an LF furnace ...

Claims

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Application Information

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IPC IPC(8): C22C33/06C21C7/06C22C38/02C22C38/04C22C38/06
CPCC21C7/0006C21C7/06C22C33/06C22C38/002C22C38/02C22C38/04C22C38/06
Inventor 汪嘉振廖建军官平平张延和杨华肖中华邹少华刘群胡彬彬李春严渊张洪浩严涛
Owner 新余钢铁股份有限公司
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