What is the cause of the “cold mole” on the surface of the billet?

The metal lumps or slag lumps embedded under the slab skin are called “cold moles”. The reason is:

(1) During open pouring, the splash of steel flow sticks to the surface of the mold and the cold steel is embedded in the solidified shell;

(2) The liquid level of the copper mould tube fluctuates too much, and the insoluble matter in the slag is involved in the solidification shell.​​

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