How to deal with the slag entrapment in the mould1. Nozzle immersion depthWhen the nozzle is immersed, the liquid depth is too deep, and it is easy to reflux
How to deal with the slag entrapment in the mould
1. Nozzle immersion depth
When the nozzle is immersed, the liquid depth is too deep, and it is easy to reflux and roll slag; If it is too deep, it increases the chance of inclusions and bubbles involved in the depth of slab, and increases the probability of breakout due to the downward movement of hot spot, resulting in poor slagging and poor lubrication
2. Outlet area
The original submerged nozzle has large upper opening and small lower opening, resulting in fast jet speed at the outlet of the lower opening, strong impact strength on the liquid level and large fluctuation range of the liquid level; At the same time, cold steel is easy to be attached to the lower opening, which is easy to form bias flow and increase the possibility of vortex slag curling. Too slow pulling speed is easy to cause reflux slag curling
3. Drawing speed
The casting speed is faster, the melting structure of mold flux changes, the thickness of slag layer becomes thinner, and the probability of rolling molten steel in powder slag layer increases; If the drawing speed is too slow, it is easy to cause backflow and slag
4. Flux viscosity
Under the condition of ensuring that the protective slag can flow smoothly into the gap between the mold and the cast surface of the billet, appropriately increase the viscosity of the protective slag and ensure the appropriate thickness of the liquid slag layer
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