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RH vacuum furnace slag surface feeding device and furnace slag modification method

A feeding device and vacuum furnace technology, applied in the field of steelmaking, can solve the problems of reducing the oxidation of slag, inability to fully react with slag, and increasing the gas content of molten steel, etc.

Active Publication Date: 2021-09-10
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the RH station does not have a hopper to directly add deoxidizer to the slag surface. Therefore, after the RH is broken, the deoxidizer is added to the slag surface. In order to ensure that the deoxidizer and slag are evenly mixed, the bottom blowing of the ladle must be started (RH treatment process Ladle bottom blowing is not turned on), after bottom blowing and stirring, the cleanliness of molten steel will become poor, and the gas content of molten steel will increase. If bottom blowing is not turned on, the deoxidizer added to the slag surface will not be able to fully react with the slag, reducing the slag oxidation

Method used

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  • RH vacuum furnace slag surface feeding device and furnace slag modification method
  • RH vacuum furnace slag surface feeding device and furnace slag modification method
  • RH vacuum furnace slag surface feeding device and furnace slag modification method

Examples

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Effect test

Embodiment 1

[0030] The 180t converter is used for smelting, and the smelting steel is IF steel.

[0031] (1) During the tapping process of the converter, the slag retaining cone is used to retain the slag, and the synthetic slag is added.

[0032] Table 1 Amount of slag in converter tapping and components of synthetic slag

[0033] furnace number Slag amount, kg / t CaO, % Al 2 o 3 ,%

CaF 2 ,%

Metal Aluminum Powder MgO, % (a) 1.0 50 25 3 15 2 (b) 1.5 45 20 5 20 4 (c) 2.0 40 15 8 25 6

[0034] (2) After the converter is tapped, the molten steel is transported to the RH station for decarburization. After the decarburization is completed, various alloys are added from the vacuum alloy chamber for deoxidation alloying.

[0035] (3) During the RH deoxidation alloying process, the slag surface is added to the triangular area 8 and its symmetrical triangular area surrounded by the RH double dipping pipe 4 and the ladle wall 6 thro...

Embodiment 2

[0048] The 180t converter is used for smelting, and the smelting steel is ST5 steel.

[0049] (1) During the tapping process of the converter, the sliding plate is used to stop the slag, and the synthetic slag is added. The amount of slag dropped and the composition of the synthetic slag are shown in Table 6.

[0050] Table 6 Amount of slag in converter tapping and components of synthetic slag

[0051] furnace number Slag amount, kg / t CaO, % al 2 o 3 ,%

CaF 2 ,%

Metal Aluminum Powder MgO, % (a) 1.0 50 25 3 15 2 (b) 1.5 45 20 5 20 4 (c) 2.0 40 15 8 25 6

[0052] (2) After the converter is tapped, the molten steel is transported to the RH station for decarburization. After the decarburization is completed, various alloys are added from the vacuum alloy chamber for deoxidation alloying.

[0053] (3) During the RH deoxidation alloying process, the slag surface is added to the triangular area 8 and its symmetrical ...

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Abstract

The invention discloses an RH vacuum furnace slag surface feeding device and a furnace slag modification method, and belongs to the technical field of steelmaking. The RH vacuum furnace slag surface feeding device comprises a high-position material bin, a material weighing bin and a telescopic and rotatable feeding guide pipe. The feeding device is mounted at a treatment station of an RH vacuum furnace, so that in the treatment stage of the RH vacuum furnace, a deoxidizing agent, synthetic slag and the like are added to the slag surface at any time to adjust the components of steel ladle slag. The operation defect that the furnace slag components cannot be directly adjusted in a traditional RH vacuum furnace treatment process is overcome, particularly for steel types such as automobile sheets, tinplates and SPHD which are subjected to converter boiling tapping and are directly conveyed to RH deep decarburization treatment, after RH decarburization treatment, the deoxidizing agent or a modifying agent can be added to the slag surface of a steel ladle through the vacuum feeding device, in combination with improvement of an RH treatment process, the oxidability of the furnace slag is reduced, and the cleanliness and pouring performance of molten steel are improved. The technology has great significance for improving the cleanliness and the pouring performance of RH single-link process cold-rolled substrate steel types.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to an RH vacuum slag surface feeding device and a slag reforming method. Background technique [0002] Cold-rolled substrates are products made of hot-rolled coils that are rolled below the recrystallization temperature, and are widely used in automobile manufacturing and electrical products. This type of steel is low-carbon, low-silicon and aluminum-killed steel, which requires low phosphorus, low sulfur and very low gas content, and the overall cleanliness requirements are also very high, resulting in strict requirements for the smelting process of this type of steel. [0003] At present, the smelting process routes of low-carbon cold-rolled substrate steel produced by domestic and foreign iron and steel manufacturers mainly include the following types: 1) BOF-RH-CC; 2) BOF-CAS (ANS)-CC; 3) BOF-LF (calcium-treated )-CC (CSP, FTSC); 4) A small number of domestic ir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/10C21C7/06
CPCC21C7/0087C21C7/10C21C7/06
Inventor 赵家七李强包燕平马建超王敏蔡小锋
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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