Abstract
The use of olivine sand as a molding material is limited in comparison with silica sand, and its characteristics are not sufficiently known. The previous papers by the authors described that the olivine sand mold prevented burning not only in the case of high manganese cast steel but also of low carbon cast steel. Metal-mold reactions between a high chromium steel and an austenitic stainless cast steel, and olivine and silica sand mold were investigated in the present work. Olivine sand mold exhibited a similar or better resistance to burning than silica sand mold with high chromium steel or austenitic stainless steel. Chromium and manganese in molten steels reacted with the surface of olivine sand and formed a smooth shell on the mold surface. The smooth shell had a high packed density of solid sand particles and prevented metal penetration. After cooling, therefore, castings were removed easily and showed no burning. But in the silica sand mold a similar smooth shell was formed only in a 25% chromium steel and an austenitic stainless steel. The surface of quartz (silica sand) and olivine (dunite not serpentinized) reacted slightly with chromium and manganese in the molten high chromium steel. Neither chromium nor manganese was detected inside the quartz or the olivine which was confined in the smooth shell layer.
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