1. Oxidation of furnace gas
The tapping hole is under a high temperature oxidizing atmosphere. The furnace gas produced during the blowing process contains a large amount of CO, and a CO reaction occurs when it is discharged from the tapping hole brick. On the inner wall of the tapping hole, the decarburized layer is formed on the surface, which directly causes damage to the steel tap.
2. Friction damage of steel and slag and mechanical erosion
When tapping, the taphole should withstand the huge pressure of the molten steel in the converter. At the same time, when the molten steel and slag flow out of the taphole, friction and scouring occur with the inner wall of the taphole.
3. High temperature melting of molten steel and slag
Under the action of high temperature molten steel, the material of the tapping hole brick will soften, causing damage to the taphole.
4. Chemical corrosion of molten steel and slag
Molten steel generally has strong oxidizing properties, a chemical reaction occurs under high temperature and high oxidizing conditions.
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