Why Does The Continuous Casting Machine Leak？-- Temperature & Crystallizer

Continuous Casting Machine one of the main operational failures encountered in the continuous casting of the continuous casting machine-is " Steel Leakage". 

When the shell of the cast stream ruptures,

The static molten steel in the billet shell overflows, blocks the machine and shuts down, which is very expensive.

In order to pull out the broken steel billet shell, it is necessary to extend the downtime caused by the broken steel, because it may block the guide roller or the foot roller. 

Air cutting is needed to clean up the blockage and pull out the blank shell. When the temperature of the slab shell decreases, it is cut into small pieces and taken out of the machine with a straightening machine. 

It can gradually straighten the curved cold billet shell in the stable stage, and the upper roll can provide enough lifting gravity.

Make a curved cast stream that is not too long. 

Therefore, the breakout of the continuous caster will greatly affect the productivity and production cost.

Factors Details

There are many factors influencing steel breakout, temperature and mold lubricity are very important:

1.The temperature and the drawing speed are inconsistent: 

the higher the degree of molten steel superheat, the thinner the thickness of the billet shell. 

Due to the static pressure exerted by the molten steel in the mold, the billet shell expands. 

When the strength of the blank shell is not enough, breakout is likely to occur.

Inconsistent and uneven temperature, when the drawing speed increases, breakout is more likely to occur, 

because the mold is not lubricated enough, from the meniscus to the billet shell/mold wall, the mold powder has poor fluidity and increases Pulling speed will result in a decrease in total heat release.

2.Poor lubrication between the mold and the billet shell-if a poor quality mold powder is used, 

the molten steel under the meniscus is likely to contain slag, which will cause the mold and the billet shell to bond, 

and the billet will be interrupted, resulting in a suspended steel breakout. 

During the continuous casting of billet, due to poor or uneven lubrication, the shell of the billet is bonded to the mold, which affects heat transfer and causes bonded breakout. 

The method of adding mold slag is incorrect. 

Due to the operating habits of the workers on site, it is added too much at one time, and it is mainly concentrated in the inner arc, which is in a slope shape, which will cause uneven filling of the liquid slag and affect the lubrication and uniformity between the mold and the shell. Heat transfer. 

Under normal pouring conditions, there is no need to remove small slag bars, and it is prohibited to use slag rods to test whether slag bars are formed in the crystallizer, which will destroy the uniform formation of the initial slab shell on the meniscus.

Therefore, although there are many reasons for the failure of the continuous casting machine, 

even the temperature and a lubricity problem are worthy of our attention and inspection. 

A good product needs regular maintenance and inspection. In this way, the efficiency will be higher and the safety factor will be higher when working.

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