Method for cleaing molten steel for continuous casting tundish by air curtain retaining wall method

Abstract

The invention relates to a continuous casting method of pouring box air curtain retaining wall clean molten steel. The adopted technical proposal is as follows: slotting a permanent layer (3) on the bottom of the pouring box and a permanent layer (3) close to the lateral wall of an air source, embedding an air brick (1) in the slot of the permanent layer (3) at the bottom of the pouring box with the upper ventilation surface of the air brick (1) paralle and level to or a little higher than a working layer (4) built at the bottom of the pouring box; embedding an argon connecting pipe (5) in theslot of the permanent layer (3) close to the lateral wall of the air source with one end of the argon connecting pipe (5) communicated with a ventilation chamber (2) of the air brick (1) embedded inthe slot on the bottom of the pouring box and the other end thereof extending upward along the slot of the permanent layer (3) close to the lateral wall and being connected with an argon source (10) through a flow meter (6), a pressure gauge (7), a buffering air tank (8) and a valve (9) outside the pouring box; and adopting smearing material to infill the construction gaps for embedding the air brick (1) and the argon connecting pipe (5). The method is conducive to eliminating inclusion due to collided growth, can improve the flow characteristic of molten steel and eliminate minute non-metallic inclusion, and effectively improves the purity of molten steel.

Description

technical field [0001] The invention belongs to the technical field of steelmaking and continuous casting. In particular, the invention relates to a method for cleaning molten steel in a continuous casting tundish air curtain retaining wall. Background technique [0002] With the development of continuous casting technology, the demand for ultra-pure steel continues to increase, and the requirements for the cleanliness of molten steel are also getting higher and higher. Improving the cleanliness of molten steel is the basis for improving the quality of steel. The refining technology outside the furnace and the use of high-quality refractory materials can reduce the impurity factors and inclusions in molten steel to a very low level. [0003] However, in actual production, the clean molten steel after refining goes through the tundish and crystallizer into the steel slab pulled out from the continuous casting machine. did not achieve the desired goal. Therefore, people use...

AI Technical Summary

Problems solved by technology

A large number of studies have shown that by setting retaining walls and other flow control technologies, it is only effective for the removal of inclusions larger than 50 μm, and the removal effect for small inclusions (less than 50 μm) is not obvious. secondary pollution

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