The cause of slag inclusion in the copper sleeve is caused by molten slag or oxides of alloying elements entering the mold, mainly as follows:
1. When smelting the alloy, the order of feeding is wrong, but a large amount of difficult-to-remove oxides such as silica, tin oxide, alumina, etc. are generated.
2. Incomplete deoxygenation
3. The design of the casting system is unreasonable or the casting process is not well controlled, resulting in splashing or turbulence of the copper liquid, and secondary oxidation during casting.
4. The slag is not cleanly removed, and it is drawn into the mold by the ladle.
5. The casting system has low slag skimming ability.
6. The casting temperature is too low and the slag can not float up.
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