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A rh vacuum slag surface feeding device and slag reforming method

A technology of feeding device and vacuum furnace, applied in the field of steelmaking, can solve the problems of inability to fully react with slag, increase the gas content of molten steel, deteriorate the cleanliness of molten steel, etc. reduced effect

Active Publication Date: 2022-06-21
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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  • A rh vacuum slag surface feeding device and slag reforming method
  • A rh vacuum slag surface feeding device and slag reforming method
  • A rh vacuum slag surface feeding device and slag reforming method

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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 blocking cone is used to block the slag, and the synthetic slag is added. The amount of the slag and the composition of the synthetic slag are shown in Table 1.

[0032] Table 1 The amount of slag in converter tapping and the composition of synthetic slag

[0033] Heat number The amount of slag, 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 tapping is completed, the molten steel is transported to the RH station for decarburization treatment. After decarburization, various alloys are added to the vacuum alloy bin for deoxidation and alloying.

[0035] (3) In the process of RH deoxidation and alloying, the slag surface is added to the triangular area 8...

Embodiment 2

[0048] Using 180t converter smelting, the smelting steel is ST5 steel.

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

[0050] Table 6 The amount of slag in converter tapping and the composition of synthetic slag

[0051] Heat number The amount of slag, 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 tapping is completed, the molten steel is transported to the RH station for decarburization treatment. After decarburization, various alloys are added to the vacuum alloy bin for deoxidation and alloying.

[0053] (3) In the process of RH deoxidation and alloying, the slag surface is added to the triangular area 8 surrounded by the...

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Abstract

The application discloses an RH vacuum slag surface feeding device and a slag reforming method, which belong to the technical field of steelmaking. The RH vacuum slag surface feeding device includes a high-level silo, a weighing silo, and a telescopic and rotating feeding conduit. By installing a feeding device at the RH vacuum furnace treatment station, it is possible to add deoxidizers, synthetic slag, etc. to the slag surface at any time during the RH vacuum furnace treatment stage to adjust the ladle slag composition. It overcomes the operation defect that the traditional RH vacuum furnace treatment process cannot directly adjust the slag composition, especially for steel types that are directly transported to RH for deep decarburization treatment, such as automotive plates, tinplate, SPHD, etc., can be decarburized in RH After treatment, the vacuum feeding device adds a deoxidizer or a modifier to the slag surface of the ladle, combined with the improvement of the RH treatment process, to reduce the oxidation of the slag and improve the cleanliness of molten steel and the pouring performance. This technology is of great significance for improving the cleanliness and pouring performance of cold-rolled substrate steel grades in the RH single-pass process.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(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