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Duplex steelmaking technique of revolving furnace

A duplex steelmaking and converter smelting technology, applied in the manufacture of converters, etc., can solve problems such as difficult to achieve predetermined results, uneconomical smelting process, and increased smelting costs, so as to improve dephosphorization equilibrium constants, eliminate thermodynamic contradictions, The effect of reducing smelting cost

Active Publication Date: 2011-04-06
CHONGQING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to balance the contradiction between the two, it is necessary to adjust other process parameters to prolong the smelting cycle and increase the cost of smelting, and it is difficult to achieve the desired effect
Moreover, for high-phosphorus iron ore, the molten iron [P] is as high as 0.30%, and to produce ultra-low-phosphorus steel from low-phosphorus molten iron, it is neither economical nor realistic to adopt the traditional converter smelting process

Method used

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  • Duplex steelmaking technique of revolving furnace
  • Duplex steelmaking technique of revolving furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] a. The molten iron is pre-desulfurized outside the converter;

[0023] b. The molten iron is put into the converter I for dephosphorization. The temperature of the molten iron in the converter I is controlled at 1320-1350°C. The temperature control of the molten iron in the converter I is completed by adding scrap steel to the molten iron before the converter I works. Among the scrap steel, light scrap steel with a thickness of less than 25mm accounts for the scrap steel 90% of the total amount, to ensure the melting of steel scrap, the slag basicity R is controlled at 2.3-2.5;

[0024] c. The dephosphorization furnace is used to stop the slag and tap the iron. The thickness of the slag layer after tapping is not more than 50mm, and the carbon content of the molten iron is controlled above 3.2%;

[0025] d. The molten iron after dephosphorization and slag removal enters the converter II for decarburization, and the temperature of the molten iron in the converter II is c...

Embodiment 2

[0030] a. The molten iron is pre-desulfurized outside the converter;

[0031] b. The molten iron is put into the converter I for dephosphorization. The temperature of the molten iron in the converter I is controlled at 1350-1380°C. The temperature control of the molten iron in the converter I is completed by adding scrap steel to the molten iron before the converter I works. Among the scrap steel, the light scrap steel with a thickness less than 25mm accounts for the scrap steel 95% of the total amount, to ensure the melting of steel scrap, the slag basicity R is controlled at 2.0-2.3;

[0032] c. The dephosphorization furnace is used to stop the slag and tap the iron. The thickness of the slag layer after tapping is not more than 50mm, and the carbon content of the molten iron is controlled above 3.2%;

[0033] d. The molten iron after dephosphorization and slag removal enters the converter II for decarburization, and the temperature of the molten iron in the converter II is ...

Embodiment 3

[0038] a. The molten iron is pre-desulfurized outside the converter;

[0039] b. The molten iron is put into the converter I for dephosphorization. The temperature of the molten iron in the converter I is controlled at 1380-1400°C. The temperature control of the molten iron in the converter I is completed by adding scrap steel to the molten iron before the converter I works. The scrap steel is light scrap steel with a thickness less than 25mm. To ensure the melting of steel scrap, the slag basicity R is controlled at 2.5-2.8;

[0040] c. The dephosphorization furnace is used to stop the slag and tap the iron. The thickness of the slag layer after tapping is not more than 50mm, and the carbon content of the molten iron is controlled above 3.2%;

[0041] d. The molten iron after dephosphorization and slag removal enters the converter II for decarburization, and the temperature of the molten iron in the converter II is controlled above 1300°C; the converter II adds manganese ore ...

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Abstract

The invention discloses a converter duplex steelmaking technology, comprising molten iron pretreatment outside a converter, converter smelting, and secondary refining outside the converter. The converter smelting comprises a dephosphorization technology and a decarbonization technology; the converter smelting is completed in two converters, wherein, the dephosphorization technology is completed in a converter 1, and the decarbonization technology is completed in a converter 2. In the steelmaking technology, the dephosphorization technology and the decarbonization technology of the converter smelting are performed in two converters, the technological parameters are respectively adjusted singly, and the functions of the converters are unique; the thermodynamic contradiction between dephosphorization and decarbonization in the steelmaking technology is eliminated; the product quality is increased, the oxygen blowing time of each converter is greatly shortened, and the smelting cycle is further shortened; little slag smelting is realized; manganese ores can be added in the decarbonization technology to adjust the thermal equilibrium and increase the final content of manganese; the amount of manganese iron during the tapping process is reduced; the smelting advantages on high manganese steel, ultra-low phosphorus steel, etc. are more prominent; the smelting cost is lowered.

Description

technical field [0001] The invention relates to a steelmaking process, in particular to a double converter steelmaking process. Background technique [0002] Steelmaking is a complex metal purification process that uses oxygen (such as air, oxygen) to oxidize the impurities contained in the charge. The main process includes removal of silicon, phosphorus, carbon, desulfurization, deoxidation and alloying. The task is to reduce the carbon content in pig iron to the specified range and reduce or increase the content of other elements to the specified range according to the requirements of the type of steel being made, so as to achieve the metal composition required by the final steel. The main task of steelmaking is to decarburize and heat up to remove phosphorus and sulfur. In the existing technology, the desulfurization function is set outside the converter (that is, the desulfurization pretreatment of molten iron), so the converter steelmaking only needs to decarburize and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28
Inventor 董荣华周宏李家春鲁德昌熊银成龙贻菊胡兵安昌遐张勇陈文满朱斌周远华
Owner CHONGQING IRON & STEEL CO LTD
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