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Smelting method for high-surface-quality IF steel

A smelting method and a high-surface technology, applied in the smelting field, can solve the problems of reduced life of the converter lining, insufficient heat source, increased risk of inclusions, etc.

Active Publication Date: 2020-08-04
攀钢集团西昌钢钒有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

China Science and Technology Project Innovation Achievement Appraisal Opinion Database (Knowledge Edition) reported Panzhihua Iron and Steel's "A method for smelting low-oxygen and low-carbon IF steel with vanadium-titanium hot metal (2016, Chen Liang, etc.)", which uses "BOF-LF-RH -CC" manufacturing process to produce low-carbon and low-oxygen IF steel, using the heating function of the LF furnace to better solve the problem of insufficient heat source for semi-steel smelting IF steel, and also overcome the problem of nitrogen absorption during the heating process of the LF process, composition control can It has reached the level of molten iron smelting IF steel in the same industry, but the process has not been used so far to solve the problem of inclusion control. There is still a certain gap between the level of inclusion control and the same industry using molten iron to smelt IF steel
On January 17, 2020, the China Patent Database (HowNet version) published Panzhihua Iron and Steel's "Method for Smelting IF Steel with Semi-steel at Low Cost, Chen Lu, etc." (main classification number: C22C33 / 06, patent classification number: C22C33 / 06; C21C5 / 28; C21C7 / 10; C22C38 / 02; C22C38 / 04; C22C38 / 14; "The manufacturing process intends to solve the problem of insufficient heat source for semi-steel smelting IF steel by increasing the tapping temperature of the converter and improving the heat preservation of the molten steel process. At present, it has not yet been verified in batches. It is foreseeable that the problem of insufficient heat source still exists when the molten iron resource is insufficient or the production is unstable. , in this case, whether it is through the deep blowing of the converter to increase the temperature or through the RH aluminum heating (the oxidation of aluminum releases heat while producing Al 2 o 3 Inclusions) to increase the temperature will increase the risk of inclusions, and at the same time increase the tapping temperature may also bring about the problem of reducing the life of the converter lining

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Smelting steel type M3A35, after the molten iron is extracted from vanadium and desulfurized, the semi-steel is put into the steelmaking converter. Temperature: 655ppm, temperature 1656°C, no lime was added during the tapping process, and slag adjusting agent was not added to the small platform behind the furnace; the temperature of the LF furnace was 1622°C before heating, heated for 8 minutes, and 481kg of lime and 164kg of slag foaming agent were added during the heating process , No slagging agent was added at the departure station, the departure temperature was 1642°C; the RH treatment was 32 minutes and 56 seconds, the O activity after cyclic decarburization was 306.35ppm, 404kg of slagging agent was added before departure, the departure temperature was 1598°C, The Als content is 0.0353%, and the Als content of the finished molten steel is 0.038%.

[0058] Actual implementation results: 1. Add 645kg of slag to the ladle before the molten steel enters the RH proces...

Embodiment 2

[0060] Smelting steel type M3A30, after the molten iron is extracted from vanadium and desulfurized, the semi-steel enters the steelmaking converter. Temperature: 713ppm, temperature 1640°C, no lime was added during the tapping process, and slag adjusting agent was not added to the small platform behind the furnace; the temperature of the LF furnace was 1580°C before heating, heated for 17 minutes, and 650kg of lime and 116kg of slag foaming agent were added during the heating process , no slagging agent was added at the departure station, the departure temperature was 1645°C; the RH treatment was 28 minutes and 29 seconds, the O activity after cyclic decarburization was 312.18ppm, 600kg of slagging agent was added before departure, the departure temperature was 1583°C, The Als content is 0.036%, and the Als content of the finished molten steel is 0.037%.

[0061] Actual implementation effect: 1. Add 766kg of slag to the ladle before the molten steel enters the RH process, whi...

Embodiment 3

[0063]Smelting steel type M3A30, after the molten iron is extracted from vanadium and desulfurized, the semi-steel enters the steelmaking converter. Temperature: 575ppm, temperature 1657°C, no lime was added during the tapping process, and no slag adjusting agent was added to the small platform behind the furnace; the temperature of the LF furnace was 1647°C before heating, heated for 10 minutes, and 383kg of lime and 200kg of slag foaming agent were added during the heating process , No slagging agent was added at the departure station, the departure temperature was 1622°C; the RH treatment was 30 minutes and 14 seconds, the O activity after cyclic decarburization was 334.507ppm, 505kg of slagging agent was added before departure, the departure temperature was 1593°C, The Als content is 0.0314%, and the Als content of the finished molten steel is 0.031%.

[0064] Actual implementation results: 1. Add 645kg of slag to the ladle before the molten steel enters the RH process, wh...

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Abstract

The invention relates to a smelting method for high-surface-quality IF steel. According to the provided smelting method of the high-surface-quality IF steel in the scheme, the BOF-LF-RH-CC manufacturing process is adopted, and an LF is used for heating molten steel to solve the problem that a semi-steel heat source is insufficient; and after the molten steel is subjected to BOF treatment and tapping and before RH treatment deoxidation, except the fact that submerged arc is added and necessary slag needed by inclusion adsorption is added in the LF treatment heating process, addition of the slagis reduced, so that the situations that oxygen in the molten steel is transferred into the slag in the process, the oxygen in the slag is transferred into steel again in the molten steel carrying andcontinuous casting process after decarburization and deoxidation of the molten steel are completed, then secondary oxidation of the molten steel is caused, and the molten steel is polluted by generated endogenous inclusions are avoided. By adopting the smelting method, the inclusion control level can be improved, and the production cost can be reduced.

Description

technical field [0001] The invention belongs to the technical field of smelting, in particular to a method for smelting IF steel with high surface quality. Background technique [0002] IF steel (Interstitial Free Stee1), also known as interstitial free steel, because of its excellent deep drawing performance, high plastic strain ratio, high elongation, high hardening index, low yield ratio, and excellent non- Timeliness, so it is known as the third generation of ultra-deep drawing steel. IF steel is mainly used for the inner and outer panels of automobiles. In recent years, automobile manufacturers have higher and higher requirements for the quality of steel sheets for automobiles, especially for IF steel used as exterior parts of automobiles. more demanding. Inclusion defects have always been the main defects that cause surface quality problems of IF steel, generally accounting for more than 60% of the surface quality defects of IF steel. The lowest level of 05 surface,...

Claims

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Application Information

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IPC IPC(8): C21C7/10C21C7/076C21C5/28
CPCC21C7/10C21C7/076C21C5/28Y02P10/20
Inventor 张龙超刘燕
Owner 攀钢集团西昌钢钒有限公司
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