Non-metallic inclusions in continuous casting slab

Non-metallic inclusions in continuous casting slabs can be divided into endogenous inclusions and foreign inclusions according to their generation methods. Endogenous inclusions. It mainly points out the deoxidation products of ferroalloy and the secondary oxidation products of molten steel and air during the pouring process. Foreign inclusions mainly refer to the inclusions brought in during the smelting and pouring process. Such as corrosion products of refractory materials in ladle and tundish, slag and mold slag that are involved. According to the composition of inclusions, it can be divided into four categories: alumina, silicate, aluminate and sulfide. According to the particle size of the inclusions, it can be divided into two types: fine inclusions and large inclusions.

It is generally believed that inclusions with a particle size of less than 50 microns are called fine inclusions, and those with a particle size greater than 50 microns are called large inclusions. The number, distribution and particle size of the final solidified inclusions in continuous casting are restricted by the purity of the molten steel in the tundish, the impact depth of the injection in the mold, and the motion state of the injection.

For the arc continuous caster, the inclusions will accumulate at only a quarter of the thickness from the inner arc surface. This is a serious shortcoming. In order to overcome this shortcoming, for some important steel grades, people advocate the use of vertical bending continuous casters for pouring.

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