Why do cracks and collapse occur in continuous casting tundish after baking?

At the corner of the connection between the slag retaining wall and the impact zone, partial shedding was found in the process of continuous casting or after baking and before pouring.
Analysis reasons:
A. it may be caused by collision in the process of pulling out the bag tire and causing internal cracks in the dry material.
B. Due to the poor lubrication effect of the wrapped tire, the pulling out of the wrapped tire will drive the dry material to become loose.
C. Loose dry materials are driven during removal of slag retaining wall template.
D. In the process of tundish hoisting, or in the process of crane cover and cover bumping.
E. Other reasons：Close to the dry vibration material, the cladding slag is obviously lower than the dry material, and it is easy to knock against in the course of crane transportation.

Change in measures：
(1) A layer of daub is added at the corner between the retaining wall and the impact zone, with a thickness of about 10mm. The coating will be applied from the retaining wall to 1/2 of the small face of the impact zone, playing a firm role and avoiding the dry vibration material falling off at the impact zone;
(2) Apply a layer of graphite powder to the retaining wall template before use to lubricate it and avoid dry material cracks in the process of lower template after the tundish is baked;
(3) Before use, add a layer of graphite powder, that is, apply twice. To increase the lubrication effect and avoid the dry material crack in the process of pulling out the tire;
(4) In the process of pulling out the bales, the third repair team will send someone to monitor, so as to avoid pulling out the bump of the babies and causing dry material crack or collapse;
(5) Observe whether there is knock dry vibration mix in the cover after continuous casting;
(6) The air holes of the cladding must be fully ventilated before tying the permanent layer.

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