Types of accidents of continuous casting breakout:The so-called breakout refers to the phenomenon that the slab shell is not solidified in the early stage of c

Types of accidents of continuous casting breakout:

The so-called breakout refers to the phenomenon that the slab shell is not solidified in the early stage of continuous casting or during the pouring process, or the slab shell is broken or leaked due to other external forces, which causes the internal molten steel to flow out. Breakout is one of the vicious accidents in continuous casting production. Serious breakout accidents not only affect the normal production of the continuous casting machine, reduce the operating rate, but also damage the equipment of the continuous casting machine and cause equipment damage. Breakout accidents can be divided into various forms due to the different time of occurrence and the different locations on the casting machine, and the causes are also different, mainly divided into the following points:

⑴ Breakout of open pouring:

Breakout caused by poor start of pouring in continuous casting process.

⑵ Suspension breakout:

Large corner seams of the crystallizer, recessed corner pads or scratches on the copper plate, resulting in an increase in the resistance to drawing the billet in the crystallizer, and easy to start hanging breakout.

(3) Crack breakout:

Serious longitudinal cracks, corner cracks or detachment occur in the crystallizer shell, which will cause breakout after exiting the crystallizer.

⑷Inclusion of slag breakout:

Because the crystallizer slag or foreign matter is wrapped in a local area of the solidified shell, the thickness of the blank shell is too thin, causing a breakout.

⑸ Cut the breakout:

When the drawing speed is too fast, the secondary cooling water is too weak, so that the liquid phase cavity is too long, and the center liquid will flow out from the crystallizerl,after the slab is cut.

⑹ Bonded breakout:

The breakout caused by the casting billet adhered to the copper mould tube wall and broken