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A method of rh rapid decarburization and reduction of molten steel temperature drop

A temperature drop and decarburization technology, applied in the field of iron and steel metallurgy, can solve the problems of low decarburization rate and large RH temperature drop, and achieve the effect of reducing the temperature drop of molten steel

Active Publication Date: 2018-09-28
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for rapid decarburization of RH and reducing the temperature drop of molten steel, which solves the technical problems of low decarburization rate and large RH temperature drop in the RH refining process existing in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1) High-carbon drawing operation is performed at the end of converter smelting, and the carbon content at the end of converter is 0.06%, which creates conditions for RH forced decarburization.

[0047] 2) The RH oxygen blowing process is divided into two stages of forced decarburization and secondary combustion, both using a 6.6m gun position.

[0048] 3) The RH arrival temperature is 1624°C, the arrival C content is 0.04%, and the arrival O content is 400ppm. When the RH vacuum reaches 180mbar, the oxygen blowing is started, and the oxygen blowing flow rate is 2000Nm 3 / h, the oxygen blowing volume is 49m 3 .

[0049] 4) Enter the secondary combustion stage after the forced decarburization is completed. The secondary combustion is divided into 4 stages, and the flow rate of oxygen blowing is 900-500-200-100Nm 3 / h is distributed in steps, and the oxygen blowing time of each stage is 40s.

[0050] 5) When the RH end temperature is 1610°C and the RH treatment time is ...

Embodiment 2

[0052] 1) High-carbon drawing operation is performed at the end of converter smelting, and the carbon content at the end of converter is 0.07%, which creates conditions for RH forced decarburization.

[0053] 2) The RH oxygen blowing process is divided into two stages of forced decarburization and secondary combustion, both using a 6.6m gun position.

[0054] 3) The RH arrival temperature is 1621°C, the arrival C content is 0.05%, and the arrival O content is 400ppm. When the RH vacuum reaches 180mbar, the oxygen blowing is started, and the oxygen blowing flow rate is 2000Nm 3 / h, the oxygen blowing volume is 69m 3 .

[0055] 4) Enter the secondary combustion stage after the forced decarburization is completed. The secondary combustion is divided into 4 stages, and the oxygen blowing flow rate is 1000-600-300-200Nm 3 / h is distributed in steps, and the oxygen blowing time of each stage is 40s.

[0056] 5) When the RH end temperature is 1608°C and the RH treatment time is 15...

Embodiment 3

[0058] 1) High-carbon drawing operation is performed at the end of converter smelting, and the carbon content at the end of converter is 0.08%, which creates conditions for RH forced decarburization.

[0059] 2) The RH oxygen blowing process is divided into two stages of forced decarburization and secondary combustion, both using a 6.6m gun position.

[0060] 3) The RH arrival temperature is 1619°C, the arrival C content is 0.06%, and the arrival O content is 400ppm. When the RH vacuum reaches 180mbar, the oxygen blowing is started, and the oxygen blowing flow rate is 2000Nm 3 / h, the oxygen blowing volume is 88m 3 .

[0061] 4) After the forced decarburization is completed, it enters the secondary combustion stage. The secondary combustion is divided into 4 stages, and the flow rate of oxygen blowing is 1100-700-400-300Nm 3 / h is distributed in steps, and the oxygen blowing time of each stage is 40s.

[0062] 5) When the RH end temperature is 1609°C and the RH treatment ti...

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Abstract

The invention discloses an RH rapid decarbonization and molten steel temperature drop reduction method and belongs to the technical field of ferrous metallurgy. The RH rapid decarbonization and molten steel temperature drop reduction method comprises the steps that high carbon drawing operation is carried out through a converter smelting end point; after steel tapping of a converter, RH refining is started, and oxygen blowing is started to conduct forced decarbonization at the early stage of RH refining; after completion of forced decarbonization, oxygen blowing is continued at the secondary combustion stage, the oxygen blowing flow at the secondary combustion stage is distributed in a stepped mode according to different RH completion C contents, and temperature drop compensation is conducted through heat release of CO gas generated from combustion. By means of the method, the carbon content can be removed to 0.0015% or below, and meanwhile, the temperature from RH completion to RH heat release temperature drop is controlled within 15 DEG C.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for rapid RH decarburization and reducing the temperature drop of molten steel. Background technique [0002] With the rapid development of the automobile industry, the demand for low-carbon and ultra-low-carbon cold-rolled steel sheets is increasing year by year. The main process adopted for smelting low-carbon and ultra-low-carbon cold-rolled steel sheets in China is converter-vacuum circulation refining furnace refining (RH refining)-continuous casting. Taking ultra-low carbon steel as an example, most of the RH refining processes adopt natural decarburization process. Remove [C] to below 15-20ppm, and add Al after decarburization to alloy Ti. At present, in the process of smelting low-carbon and ultra-low-carbon cold-rolled steel sheets in domestic steel mills, there are common problems such as high converter end temperature, long RH station period...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/10C21C7/068
CPCC21C7/068C21C7/10
Inventor 赵东伟李海波彭开玉田志红刘风刚陈建光刘道正王佳力冀建立青靓钱宇婧刘国梁高占晓
Owner SHOUGANG CORPORATION
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