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Molten steel dephosphorization agent and molten steel dephosphorization refining method

A dephosphorization agent and molten steel technology, which is applied in the field of dephosphorization and refining of molten steel, can solve the problems of limited dephosphorization effect, etc., and achieve the effect of avoiding the phenomenon of rephosphorization and good dephosphorization effect.

Inactive Publication Date: 2014-12-10
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process method only adds dephosphorization agent in the tapping process, and removes slag without argon blowing and stirring in any subsequent process. The actual dephosphorization effect is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] A factory has a 210t converter with a steel tapping capacity of 210t. The measured oxygen activity in molten steel is 900ppm, and the phosphorus content in molten steel is 0.025%. During the tapping process, 7kg / t of dephosphorizing agent is added along with the steel flow, and the proportion of small limestone (with a particle size of less than 30mm, and the proportion of 5-20mm in particle size is 90%) in the dephosphorizing agent is 89wt%, and the proportion of fluorite is 89wt%. It is 11wt%. In the LF process, the slag is heated electrically and argon is blown for 4 minutes, and the flow rate of argon blowing is 130Nm 3 / h. Then carry out the slag removal operation. Then, according to the molten steel temperature, in the LF process, the temperature is raised through the electrodes to reach the required temperature of the steel type and other refining treatments are performed. After LF treatment, the phosphorus content in molten steel is reduced to 0.002%, and the...

example 2

[0027] A factory has a 210t converter, with a steel tapping capacity of 210t, the measured oxygen activity in molten steel is 800ppm, and the phosphorus content in molten steel is 0.020%. During the tapping process, 8kg / t of dephosphorizing agent is added along with the steel stream, and the proportion of small limestone (all less than 30mm in particle size, 90% of particle size is 5-20mm) in the dephosphorizing agent is 86wt%, and the proportion of fluorite is 86wt%. is 14wt%. In the LF process, the slag is heated electrically and argon is blown for 3 minutes, and the flow rate of argon blowing is 100Nm 3 / h. Then carry out the slag removal operation. Then, according to the molten steel temperature, in the LF process, the temperature is raised through the electrodes to reach the required temperature of the steel type and other refining treatments are performed. After LF treatment, the phosphorus content in molten steel is reduced to 0.001%, and the dephosphorization rate r...

example 3

[0029]A factory has a 210t converter, a steel tapping capacity of 210t, the measured oxygen activity in molten steel is 1000ppm, and the phosphorus content in molten steel is 0.022%. During the tapping process, 6kg / t of dephosphorization agent is added along with the steel flow, and the proportion of small limestone (with a particle size of less than 30mm, and 90% of the particle size is 5-20mm) in the dephosphorization agent is 87wt%, and the proportion of fluorite is 87wt%. is 13wt%. In the LF process, the slag is heated electrically and argon is blown for 4 minutes, and the flow rate of argon blowing is 90Nm 3 / h. Then carry out the slag removal operation. Then, according to the molten steel temperature, in the LF process, the temperature is raised through the electrodes to reach the required temperature of the steel type and other refining treatments are performed. After LF treatment, the phosphorus content in molten steel is reduced to 0.0025%, and the dephosphorizatio...

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Abstract

The invention provides a molten steel dephosphorization agent and a molten steel dephosphorization refining method. The molten steel dephosphorization method comprises the following steps in sequence: ensuring the oxygen activity is greater than or equal to 5000ppm at the final point of molten iron at the blowing end point of a converter, and adding 5-8kg of a dephosphorization agent into each ton of steel in the process that steel is discharged from the converter, wherein the dephosphorization agent comprises the following components in parts by weight: 85-90 parts of lime and 10-15 parts of fluorite, and the total parts is 100; performing LF ladle refining on the molten iron, melting the slag in an electric heating mode, introducing argon for bottom blowing and stirring to the molten iron at the speed of 80-150Nm<3> / hour so as to provide a sufficient power reaction space to the molten iron and the dephosphorization slag, and subsequently slagging off. The molten steel dephosphorization agent has the beneficial effects that dephosphorization treatment can be performed on the molten iron after smelting and dephosphorization in the converter, so that the rephosphorization phenomenon of the molten iron which is smelted in the converter can be effectively avoided, and the dephosphorization effect is good.

Description

technical field [0001] The invention relates to the technical field of molten steel dephosphorization, in particular to a molten steel dephosphorization agent for dephosphorizing molten steel from a converter, and a molten steel dephosphorization refining method using the molten steel dephosphorization agent. Background technique [0002] Harmful impurities such as phosphorus and sulfur in steel are directly related to the performance of steel. The presence of phosphorus in steel will reduce the plasticity of steel. When the phosphorus content in steel is high, the steel is prone to "cold brittleness". In production, by reducing the phosphorus content in steel through dephosphorization, the plasticity and toughness of steel will be improved, which can greatly improve the mechanical properties of steel. [0003] With the development of the economy, modern society has increasingly higher requirements on the performance of steel materials, which means that the control of impuri...

Claims

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Application Information

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IPC IPC(8): C21C7/064
Inventor 梁新腾曾建华李扬洲龚洪君杨森祥杜利华喻林陈均何为陈路
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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