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Refining method for improving clean class of steel

A cleanliness and ladle furnace refining technology, applied in the direction of improving process efficiency, can solve the problems of reducing inclusions and not being able to significantly improve steel cleanliness

Inactive Publication Date: 2011-01-26
PANGANG GROUP RESEARCH INSTITUTE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the ladle furnace refining method can improve the desulfurization effect, the application of the existing ladle furnace refining method to the steelmaking technology still cannot significantly improve the cleanliness of the steel, that is, reduce the content of inclusions in the steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] This example is used to illustrate the refining method for improving the cleanliness of steel provided by the present invention.

[0019] (1) 136 tons of molten iron are injected into a 120-ton converter to carry out top-bottom combined blowing smelting, and 131 tons of molten steel are obtained (based on the total weight of the molten steel, the molten steel contains 0.27% by weight of carbon, 0.30% by weight of silicon , 0.45% by weight of manganese, 0.007% by weight of phosphorus, 0.003% by weight of sulfur, 0.10% by weight of vanadium and 98.87% by weight of iron), the molten steel obtained by smelting is added to the ladle, relative to each ton of the obtained by smelting Molten steel, the molten steel obtained by the smelting contains 4 kg of slag. When 20% by weight of molten steel obtained by smelting is added to the ladle, add 327.5 kilograms of high-basicity refining slag (based on the total weight of the high-basicity refining slag, the high-basicity Refinin...

Embodiment 2

[0025] This embodiment is used to illustrate the refining method for improving the cleanliness of steel provided by the present invention.

[0026] (1) Inject 136 tons of molten iron into a 120-ton converter for top-bottom re-blowing smelting to obtain 131 tons of molten steel (based on the total weight of the molten steel, the molten steel contains 0.14 wt % of carbon and 0.40 wt % of silicon , 0.88% by weight of manganese, 0.012% by weight of phosphorus, 0.008% by weight of sulfur, 0.004% by weight of vanadium and 98.556% by weight of iron), the molten steel obtained by smelting is added to the ladle, relative to the amount of molten steel, the molten steel obtained by the smelting contains 5 kg of slag. When 5% by weight of smelted molten steel was added to the ladle, 262 kg of high basicity refining slag (based on the total weight of the high basicity refining slag, the high basicity refining slag) was added to the ladle Refining slag contains 70% by weight of CaO, 5% by ...

Embodiment 3

[0032] This embodiment is used to illustrate the refining method for improving the cleanliness of steel provided by the present invention.

[0033] (1) Inject 136 tons of molten iron into a 120-ton converter for top-bottom re-blowing smelting to obtain 131 tons of molten steel (based on the total weight of the molten steel, the molten steel contains 0.05% by weight of carbon and 0.01% by weight of silicon , 0.28% by weight of manganese, 0.018% by weight of phosphorus, 0.009% by weight of sulfur, 0.004% by weight of vanadium and 99.629% by weight of iron), the molten steel obtained by smelting is added to the ladle, relative to the amount obtained per ton of said smelting molten steel, the molten steel obtained by the smelting contains 3.5 kg of slag. When 35% by weight of smelted molten steel was added to the ladle, 393 kg of high basicity refining slag (based on the total weight of the high basicity refining slag, the high basicity refining slag) was added to the ladle Refin...

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Abstract

The invention relates to a refining method for improving the clean class of steel. The method comprises the following steps of: adding molten steel obtained by smelting into a steel ladle, and performing ladle furnace refining and casting sequentially, wherein refining slag is added into the steel ladle in the process of adding the molten steel obtained by the smelting into the steel ladle; and in the process of the ladle furnace refining, a deoxidant and a desulfurizing agent are added into the steel ladle in batch; and 2 to 3 kilograms of the refining slag and2 to 6 kilograms of the deoxidant and the desulfurizing agent are added into one ton of molten steel obtained by the smelting. The method provided by the invention has the excellent desulfuration effect, and can reduce the impurity content of the steel obviously.

Description

technical field [0001] The present invention relates to a refining method for improving the cleanliness of steel. Background technique [0002] With the development of modern science and technology and the improvement of steel quality requirements in industry and agriculture, steel mills generally adopt the process of refining outside the furnace, because this technology can increase the production capacity of steelmaking equipment, improve steel quality, reduce energy consumption, reduce Refractories, energy and ferroalloy consumption, therefore, the refining technology outside the furnace has become an indispensable and important link in the modern steelmaking process, and the direction of the development of iron and steel metallurgy in the world today. Ladle furnace refining (LF) has been widely used in steel production plants due to its various metallurgical functions and flexibility in use. Compared with other refining facilities outside the furnace such as VAD, VOD, C...

Claims

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Application Information

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IPC IPC(8): C21C7/04C21C7/076C21C7/06C21C7/064
CPCY02P10/20
Inventor 周伟曾建华杨洪波李清春汪明东冯远超
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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