Continuous casting water mouth tumor causes and solution measures

What’s a stomatoma?
Tumor or clogging in the water mouth often appears in the continuous casting process of the upper water mouth, sliding water mouth, immersed in the water mouth, especially in the immersed in the water mouth of the most common tumors. Different types of steel, pouring conditions are different, the mechanism and the type of blockage of the water mouth tumor or blockage is not exactly the same.

Water mouth tumor not only affects the normal pouring process of continuous casting, but also affects the quality of casting. In order to adapt to the development needs of advanced steel/clean steel continuous casting and high efficiency continuous casting, to improve the erosion resistance and prevent the water mouth aneurysm is still one of the main focuses of the research on functional refractory materials for continuous casting.

Reasons for water mouth tumor

Tumor is the result of the joint action of many factors, the tumor mainly comes from the inclusions in the liquid steel, and the tumor process and refractory materials and the reaction between the liquid steel, the temperature of the liquid steel, the liquid steel in the mouth of the flow state, the inclusions in the liquid steel or the type of deoxygenation products, the composition of the water inlet lining and water inlet smoothness and other factors related to the inner surface.

The process of spout clogging is divided into two stages:

The first stage

The first stage is the roughness of the inner surface of the spout, that is, the liquid steel and its inclusions and the role of the surface of the spout, resulting in a reaction layer (decarburization layer) or cold steel layer, resulting in roughness and unevenness of the inner surface of the spout, eddy currents near the surface to increase the surface near the inclusions in the liquid steel to the surface of the spout to migrate to the surface of the trend increases in the surface of the increased chances of deposition.

The second stage

The second stage is the liquid steel inclusions in the reaction layer (decarburization layer) or cold steel layer on the deposition, and the first stage of the decisive role in whether or not the blockage occurs.