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A kind of molten steel dephosphorization agent and the method for molten steel dephosphorization

A technology of water dephosphorization agent and dephosphorization agent, which is applied in the field of molten steel dephosphorization agent and can solve the problems of low dephosphorization rate

Active Publication Date: 2016-02-24
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the defect that the dephosphorization rate is low when the molten steel is dephosphorized by the existing method, and to provide a new molten steel dephosphorization agent and to use the molten steel dephosphorization agent under a specific argon blowing intensity. The method of carrying out dephosphorization of molten steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment is used to illustrate the molten steel dephosphorization agent and the method for molten steel dephosphorization provided by the present invention.

[0036] In a factory with a 210t converter and 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% by weight. During the tapping process of the converter, add the molten steel dephosphorization agent 7kg / t steel along with the steel flow. The molten steel dephosphorization agent contains lime and bauxite, and the content of lime is 92.5% by weight, and the content of bauxite is 7.5% by weight. Move the molten steel after adding the molten steel dephosphorization agent to the LF furnace for dephosphorization. In the LF process, turn on the electric heating process to control the temperature of the molten steel at 1580°C to melt slag, and the intensity of argon blowing is 140Nm 3 / h·ton of molten steel, the argon blowin...

Embodiment 2

[0038] This embodiment is used to illustrate the molten steel dephosphorization agent and the method for molten steel dephosphorization provided by the present invention.

[0039] In a factory with a 210t converter and 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% by weight. During the tapping process of the converter, 8kg / t of molten steel dephosphorization agent is added along with the steel flow. The molten steel dephosphorization agent contains lime and bauxite, and the content of lime is 95% by weight, and the content of bauxite is 5% by weight. Move the molten steel after adding the molten steel dephosphorization agent to the LF furnace for dephosphorization. In the LF process, turn on the electric heating process to control the temperature of the molten steel at 1590°C to melt slag, and the intensity of argon blowing is 120Nm 3 / h·ton of molten steel, the argon blowing time...

Embodiment 3

[0041] This embodiment is used to illustrate the molten steel dephosphorization agent and the method for molten steel dephosphorization provided by the present invention.

[0042] In a factory with a 210t converter and 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% by weight. During the tapping process of the converter, add molten steel dephosphorization agent 6kg / t steel along with the steel flow. The molten steel dephosphorization agent contains lime and bauxite, and the content of lime is 90% by weight, and the content of bauxite is 10% by weight. Move the molten steel after adding the molten steel dephosphorization agent to the LF furnace for dephosphorization. In the LF process, turn on the electric heating process to control the temperature of the molten steel at 1570°C to melt slag, and the intensity of argon blowing is 160Nm 3 / h·ton of molten steel, the argon blowing time...

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Abstract

The invention discloses a molten steel dephosphorizing agent and a method for dephosphorizing molten steel. According to the method, molten-state molten steel to be dephosphorized comes into contact with the molten steel dephosphorizing agent in the tapping process of a converter; the contact product is transferred to an LF (ladle furnace) for dephosphorizing; drossing is carried out after dephosphorization is completed, wherein the molten steel dephosphorizing agent is prepared from 80-98 percent of lime and 2-20 percent of bauxite on the basis of the total weight of the molten steel dephosphorizing agent; the argon blowing strength in the LF furnace is at least 100Nm<3> / h.ton of molten steel. By adopting the molten steel dephosphorizing agent provided by the invention, dephosphorization can be performed in a specific argon blowing intensity, and the phosphor content in the molten steel can be remarkably reduced, so that the dephosphorization rate of the molten steel can be improved. The molten steel dephosphorizing agent has an extraordinary industrial application prospect.

Description

technical field [0001] The invention relates to a molten steel dephosphorization agent and a method for using the molten steel dephosphorization agent to dephosphorize molten steel. Background technique [0002] Harmful impurities such as phosphorus and sulfur in steel are directly related to the performance of steel, and the presence of phosphorus in steel will reduce the plasticity of steel. When the phosphorus content in the steel is high, the steel is prone to "cold brittleness". In metallurgical production, the plasticity and toughness of the steel will be improved by reducing the phosphorus content in the steel, which can greatly improve the mechanical properties of the 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 impurity content in steel is becoming more and more strict. It is an important task for iron and steel enterprises to strive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
Inventor 梁新腾曾建华李扬洲龚洪君杨森祥杨晓东喻林陈均何为陈路
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP