Method for stabilizing semi-steel quality

A stable and high-quality technology, applied in the field of metallurgy, can solve the problems of large quality fluctuation of semi-steel, large temperature fluctuation, affecting the control accuracy of converter smelting end point, etc.

Active Publication Date: 2017-08-18
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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Problems solved by technology

Due to the difference in silicon and carbon content in vanadium-containing hot metal and the difference in temperature of molten iron, the carbon and temperature fluctuations in semi-steel after vanadium extraction are relatively large
The mass percentage of carbon in semi-steel obtained after vanadium extraction in conventional converters is 2.5-4.0%, the content of silicon and manganese heating slagging elements in semi-steel are all traces, and the temperature fluctuation of semi-steel is between 1300-1400 °C. The average carbon content of the semi-steel mixed into the steelmaking converter is about 3.1%, and the average is about 1320°C. The carbon and temperature fluctuation range of the semi-steel is too large, resulting in large fluctuations in the quality of the semi-steel, which seriously affects the control accuracy of the converter smelting end point
[0003] There is no report on extracting vanadium from molten iron containing vanadium and stabilizing the quality of semi-steel in existing patents and literature

Method used

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  • Method for stabilizing semi-steel quality

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Embodiment

[0024] A 120t converter in a factory uses vanadium-containing hot metal to extract vanadium to make steel. The carbon and temperature of vanadium-containing hot metal, the carbon and temperature changes of semi-steel after the first step of the present invention, and the use effect after the second step are shown in Table 2.

[0025] Table 2 Effect of the present invention

[0026]

[0027] As can be seen from the above table 2, when other conditions are all the same, when the present invention is adopted to extract vanadium from special molten iron, the semi-steel carbon and semi-steel temperature at the end point of vanadium extraction converter smelting are all significantly improved, and the semi-steel after vanadium extraction is also significantly improved. After the ferrosilicon is added to the semi-steel when the vanadium is extracted, the carbon content of the semi-steel in the steelmaking converter is significantly reduced, and the temperature of the semi-steel in ...

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Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a method for stabilizing semi-steel quality after extracting vanadium from vanadium-containing molten steel. The method for stabilizing semi-steel quality comprises the following steps of: A, adding a recarburizer before a vanadium extracting end point according to carbon content and molten iron temperature in the vanadium-containing molten steel; and B, performing thermal compensation on semi-steel by adding ferrosilicon according to carbon content of semi-steel during tapping. The method has the advantage of stabilizing semi-steel quality.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for stabilizing semi-steel quality after vanadium-containing molten iron is extracted. Background technique [0002] Due to the unique resources of vanadium-titanium ore, Panzhihua Iron and Steel's blast furnace is smelted with vanadium-titanium magnetite, and its hot metal has low content of heating elements such as silicon and manganese and high content of sulfur. Vanadium extraction from converter is a major feature of Panzhihua Iron and Steel's steelmaking. Its principle is to use high-speed oxygen jet to stir the molten iron containing vanadium in the oxidation converter, and to control the oxidation rate in the furnace by adding coolant and controlling the amount of coolant to achieve the purpose of removing vanadium and preserving carbon. the goal of. Due to the different silicon and carbon contents in the vanadium-containing hot metal and the temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00
CPCC21C7/00C21C7/0025
Inventor 陈均曾建华李平凡黄正华梁新腾李盛杨森祥王誉云彭友全
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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