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Smelting method to control the oxidation of top slag of if steel

A smelting method and oxidizing technology, applied in the field of metallurgy, can solve the problems of unfavorable environment, unstable modification effect, affecting product quality stability, etc., and achieve the effect of good quality and good cleanliness control.

Active Publication Date: 2020-08-07
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the upgrading effect of this top slag upgrading method is unstable, which affects the stability of product quality; a large amount of smoke and dust will be generated during the upgrading reaction process, which is not good for the environment

Method used

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  • Smelting method to control the oxidation of top slag of if steel
  • Smelting method to control the oxidation of top slag of if steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The smelting method for controlling the oxidation of IF steel top slag includes four major processes (80-ton converter, 80-ton LF furnace, and 80-ton RH furnace) of converter smelting LD, LF furnace refining, RH refining and continuous casting CC.

[0023] 1) Converter smelting LD: The converter uses low-temperature high-carbon tapping. At this time, the temperature of molten steel is 1660℃~1670℃, and the carbon content [C] of the molten steel is 0.04~0.05%, and the oxygen content [O] is 400~600ppm , Adding 200~280kg lime / furnace during the whole tapping process, the oxidizing property wT.Fe of top slag is 8~12%;

[0024] 2) LF furnace refining: After the molten steel arrives at the station, the temperature is raised. The heating time is 8-12min to increase the temperature of the molten steel by 10-20℃. Then 100kg of carbon powder is added to the slag surface. The content [O] is 300 to 500 ppm, the molten steel temperature is 1680 to 1690°C, and the oxidizing property wT.Fe ...

Embodiment 2

[0029] A smelting method for controlling the oxidation of IF steel top slag. The method includes four major processes (150-ton converter, 150-ton LF furnace, and 150-ton RH furnace) of converter smelting LD, LF furnace refining, RH refining, and continuous casting CC.

[0030] 1) Converter smelting LD: The converter uses low-temperature high-carbon tapping. At this time, the temperature of molten steel is 1660℃~1670℃, and the carbon content [C] of the molten steel is 0.04~0.05%, and the oxygen content [O] is 400~600ppm , 400~500kg lime / furnace is added during the whole tapping process, and the top slag oxidation wT.Fe is 8~12%;

[0031] 2) LF furnace refining: After the molten steel arrives at the station, the temperature is raised. The heating time is 9-11min to increase the temperature of the molten steel by -20℃, and then 200kg carbon powder is added to the slag surface. At the end of the LF furnace refining, the oxygen content in the steel [O] is 300 to 500 ppm, the molten stee...

Embodiment 3

[0036] The smelting method for controlling the oxidation of IF steel top slag. The method includes four major processes (250-ton converter, 250-ton LF furnace, and 250-ton RH furnace) of converter smelting LD, LF furnace refining, RH refining, and continuous casting CC.

[0037] 1) Converter smelting LD: The converter uses low-temperature high-carbon tapping. At this time, the temperature of molten steel is 1650℃~1660℃, and the carbon content [C] of the molten steel is 0.03~0.05%, and the oxygen content [O] is 400~600ppm , 650~800kg lime / furnace is added during the whole tapping process, and the top slag oxidation wT.Fe is 8~12%;

[0038] 2) LF furnace refining: After the molten steel arrives at the station, the heating operation is carried out. The heating time is 8-10min to increase the temperature of the molten steel by 20℃, and then 300kg carbon powder is added to the slag surface. At the end of the LF furnace refining, the oxygen content in the steel [ O] is 300~500ppm, the te...

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Abstract

The invention discloses a smelting method for controlling the oxidation property of IF steel top slags, which comprises four processes of converter smelting LD, LF furnace refining, RH refining and continuous casting (CC), in the method, when RH refining is ended, the oxidation property of the top slags and the oxygen content in steel are more stable, which is beneficial to ensure the stability ofproduct performance. In the method of the invention, the oxidation property of the top slags wT.Fe is decreased from (6% to 12%) to (6% to 8%), the oxygen content [O] in steel is decreased from (18 to 30 ppm) to (18 to 23 ppm), the amount of inclusions in steel is decreased from (0.35 to 0.65 piece / mm<2>) to (0.30 to 0.45 piece / mm<2>), and the correction rate of finished product inclusions is decreased from 1.25% to 0.87%. The cleanliness degree of molten steel is controlled to be better and more stable, and the quality of finished products is also better.

Description

Technical field [0001] The invention relates to the technical field of metallurgy, in particular to a smelting method for controlling the oxidation of IF steel top slag. Background technique [0002] IF steel is widely adopted by industries such as automobiles and home appliances due to its good deep-drawing performance. At the same time, with the progress of society, users have higher and higher requirements for the surface quality of cold-rolled sheets, and large inclusions cause the surface of cold-rolled sheets. One of the important reasons for defects. Due to the requirement of deep decarburization of IF steel in the later stage of converter smelting, converter slag has high oxidizing property. During the tapping process, the slag inevitably enters the ladle, and forms the top slag of the ladle with lime and other substances added during the tapping process. Most of the oxidizing properties of wT.Fe are in the range of 12% to 18%, which leads to high oxygen potential of sla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C7/10C21C7/06C21C7/068
CPCC21C5/28C21C7/0006C21C7/0025C21C7/06C21C7/068C21C7/10
Inventor 杨成威彭著刚齐江华陈俊孚朱万军孙伟
Owner 武汉钢铁有限公司