Abstract
The preceding paper described that manganese in liquid high-manganese cast steel makes a smooth semifused shell at the metal-mold interface and prevents burning of olivine sand mold. A comparison was made between olivine and silica sands, and the effect of manganese coating on olivine sand on burning was investigated in the present work. No burning takes place between olivine sand and low carbon cast steel, but a small quantity of manganese from the steel diffuses into the olivine sand at the metal-mold interface. The low carbon cast steel penetrates into the silica sand mold. The low carbon steel and silica sand are combined into fayalite containing a small quantity of manganese at the metal-mold interface. Manganese in liquid high manganese cast steel diffuses into the mold, and manganese and silica sand are combined into molten 2MnO⋅SiO2. But the high-manganese cast steel does not penetrate into silica sand because of low pressure of the molten metal. Manganese coating of olivine sand prevents the burning of low carbon cast steel.
