The process of metal refining, casting and crystallization in a vacuum chamber. It can greatly reduce the gas content in the metal and prevent its oxidation. It can be used to produce special alloy steel castings with high requirements and titanium alloy castings that are easily oxidized. High cost, generally used for smelting and foundry high-quality castings, which can significantly reduce the gas content. The mold used shall not contain volatiles to avoid damaging the vacuum degree.
No classification at present.