Protective Slag in Contiuous Casting Maching MouldFunction of Protective Slag for continuous casting:1. Thermal insulation (mainly completed by solid slag)The

Protective Slag in Contiuous Casting Maching Mould

Function of Protective Slag for continuous casting:

1. Thermal insulation (mainly completed by solid slag)

The plant operating environment (thermal radiation) has been greatly improved to facilitate the smooth continuous casting. The solid slag layer with sufficient thickness can give better play to the thermal insulation performance of protective slag and prevent cold steel and floating steel from condensing on the steel level of mold. Many problems and accidents will be avoided by increasing the temperature in the meniscus area of the mold. Such as cracks, pores on the surface of slab, etc.

2. Absorb and melt impurities (mainly completed by liquid slag layer)

It can effectively absorb melting inclusions (system refractory, deoxidation products and other metal inclusions), protect its own performance from change, purify molten steel, improve the purity of slab surface, low viscosity of protective slag and proper control of some components of protective slag, which is good for slag absorption.

3. Lubrication function

The excellent lubrication function of protective slag can greatly reduce the friction between billet and copper wall, so as to ensure the smooth operation of billet and the continuous improvement of speed control. The improvement of speed control is related to the process. Moreover, it is directly related to excellent protective slag.

Because the liquid slag on the steel surface can not flow evenly and distribute around the billet, resulting in uneven thickness of the solidified shell, stress concentration is easy to occur at the thin part of the billet shell, and cracks occur when the stress exceeds the high-temperature strength of the solidified shell. It is pointed out that the longitudinal cracks on the slab surface can be significantly reduced by keeping the liquid slag layer on the mold steel surface at 5 to 15 mm.