Improvement In Spalling Resistance of Basic Material for Slide Gate Plate

摘要

MgO- based materials are often used for the steel ladle and/or tundish slide gate plate treating corrosive steel due to its excellent corrosion resistance. Disadvantageously, the thermal spalling resistance of the materials is very poor. Although including low thermal expansion substances such as spinel improve the thermal spalling resistance, the corrosion resistance deteriorates if excessively large amount of spinel are added. Therefore, the influence of the grain size distribution of spinel was investigated. On the bases of the investigation, the corrosion resistance of high thermal spalling resistant MgO-C slide gate plate was successfully improved by utilizing coarse spinel aggregates.