Electric resistance wire heating type tundish and heating method thereof

Abstract

The invention provides an electric resistance wire heating type tundish and a heating method thereof. A serpentine groove is formed in the inner surface of an insulation layer of the tundish. Electricresistance wires are embedded in the groove. A magnesium powdery refractory material is spread between the electric resistance wires. An online temperature measurement probe and the electric resistance wires are connected with a power source automatic heating control device. A slag blocking wall is arranged in the center of the tundish bottom. The online temperature measurement probe and a stopper rod are arranged on the two sides of the slag blocking wall. The stopper rod is connected with a stopper rod control device. The temperature condition value is set for first ladle molten steel withthe tundish capacities being 20 to less than 45 tons and 45 to 60 tons according to the molten steel superheat degree of 25 DEG C, the temperature condition value is set for second ladle and the laterladles according to the molten steel superheat degree of 20 DEG C, and the temperature condition values are controlled independently. The converter tapping temperature and refining carry-out temperature can be lowered, the converter life is prolonged, the ladle turnover frequency is increased, the use cost of the refractory material per ton of steel is reduced, the refining time is shortened, molten steel constant temperature casting is achieved, the constant drawing speed of continuous casting blanks is increased, and the cast blank quality is improved.

Description

Technical field [0001] The invention belongs to the field of continuous casting, and particularly relates to a resistance wire heating type tundish and a heating method thereof. Background technique [0002] In continuous casting production, the superheat of molten steel in the tundish is a very important process control parameter. Excessive overheating will affect the internal quality of the billet and increase the risk of leakage; too low overheating may cause the nozzle to block. It affects the smooth progress of production, and at the same time inhibits the floating and removal of inclusions, which is not conducive to improving the cleanliness of molten steel. In addition, excessive fluctuations in the degree of superheat between the tanks of molten steel will also cause contamination of the molten steel. Therefore, the ideal state is that the degree of superheat is appropriate and the degree of superheat of each tank cannot fluctuate greatly to ensure that the molten steel ...

AI Technical Summary

Problems solved by technology

But there are also some shortcomings: the induction coil has many cooling pipes and cables, which cannot be easily disassembled, resulting in the inability to realize quick docking and separation between the tundish and the crystallizer

If the continuous casting process is terminated for some reason, in order to protect the tundish, the remaining molten steel has to be turned over, resulting in huge waste

In addition, when the induction heater is working, it will also inductively heat the surrounding ferromagnetic materials such as the tundish shell, which reduces the safe use of the tundish. The electromagnetic waves and noise will also endanger the health of nearby process operators

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