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Method for capturing and absorbing suspending impurities in tundish

A technology of tundish and residence time, which is applied in the direction of casting melt containers, metal processing equipment, casting equipment, etc., can solve the problems of large scope and high cost of equipment transformation, and achieve the effect of reducing molten steel pollution

Inactive Publication Date: 2013-12-25
ANGANG STEEL CO LTD
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

This solution needs to modify the tundish and make ventilating elements, which is costly and requires a relatively large range of equipment modification

Method used

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  • Method for capturing and absorbing suspending impurities in tundish

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Embodiment Construction

[0012] Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described step by step:

[0013] A method for trapping and absorbing suspended inclusions in a tundish. Taking a 30-ton tundish and a steel type SPHC low-silicon aluminum cold-rolled sheet as an example, a CaCO 3 Composition of dike construction boards utilizing CaCO 3 Material thermal burst characteristics, self-generated nucleation centers and bubble power during the pouring process, trap and remove oxides in the continuous casting tundish into the slag, the specific operation steps are as follows:

[0014] 1) As shown in Figure 1, a dike building plate 3 is built on the side of the stopper rod 4 next to the tundish dike 2 at the bottom of the tundish 1, and the size of the dike building plate 3 is 150 mm wide and 750 mm long, and its height is the same as that of the tundish dike The proportion of limestone in the raw material composition of the embankment constructio...

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Abstract

The invention relates to the field of continuous casting of slabs, in particular to a method for capturing and absorbing suspending impurities in a tundish. The method is characterized in that a dike building plate containing CaCO3 is arranged at the bottom of the tundish, a nucleation center and bubble power are self-generated in the process of pouring by utilizing heat burst characteristics of the CaCO3 material, and oxides in the continuously-cast tundish are captured and removed to enter furnace slag. The method specifically includes that 1), the dike building plate is built on one side of a tundish dike at the bottom of the tundish; 2), in the process of pouring, CaCO3 particles burst and decompose layer by layer, generated CO2 and CaO particles enter molten steel, slag washing is performed on the molten steel flowing through above, a protection atmosphere is formed, the CaO particles are combined with aluminum impurities, and the objective of purifying the molten steel is achieved. Compared with the prior art, the method has the advantages that tiny bubbles formed by CO2 generated during bursting of CaCO3 float upwards and expand, and capturing of aluminum-oxygen impurities is realized.

Description

technical field [0001] The invention relates to the field of continuous casting of low-silicon-aluminum cold-rolled thin slabs, in particular to a method for collecting and absorbing suspended inclusions in a tundish. Background technique [0002] In the continuous casting production of low-silicon-aluminum cold-rolled sheet steel, the tundish is an intermediate container connecting the ladle and the continuous casting crystallizer during the steel pouring process. After the molten steel enters the tundish, because the inner cavity of the tundish is filled with air before pouring, it is a strong oxidizing atmosphere, and the molten steel is oxidized in contact with the air during the process of filling the tundish, because the inclusions stay in the continuous casting tundish After a long time, a large number of aluminum oxide inclusions with complex structures are formed. The inclusions are small in size and require nucleation centers. However, it is difficult to produce nu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D41/00
Inventor 王文科张越李泽林梅雪辉张丽娜齐志宇王晗桐王荣傅钢
Owner ANGANG STEEL CO LTD
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