1. Installation problem of slide gate plate
(1) Slide gate plate installation surface is not clean, or use too much fire clay when installs upper nozzle, resulting in crack between slide gate plate during casting steel;
(2) Slide gate plate pressure is not enough.
2. Quality problem of slide gate plate
(1) Slide gate plate material can not meet the requirements of casting steel. The harmful ingredients in the slide gate plate exceeded, resulting in increased thermal chemical erosion of the slide gate plate;
(2) There is crack on the slide gate plate when using, and abnormal expansion, the molten steel produces a "V" type melt loss along the crack, resulting in the use of the slide in the slide.
3. Operation problem of casting steel
When the nozzle can not automatically pouring and need to burn oxygen, if the slide gate plate is not fully open in place when burning oxygen, will cause the upper slide gate plate is seriously burned.