鋳型内潤滑に及ぼす連鋳パウダー物性の実験および理論的解明

抄録

Physical and chemical properties of casting powder, which affect mold lubrication during continuous casting of slabs, are evaluated. Experiments of insulating characteristics of unmelted layer of casting powder are made to study the effect of the size and shape of granule of casting powder on melting rate. The effect of chemical composition of casting powder on crystallization and freezing temperature of molten slag is examined in laboratory and practice. Special additives such as BaO, MgO, and B₂O₃ are effective in lowering freezing temperature and also in prevention of crystallizing of the slag. The rate of slag flow from meniscus and the resulting slag film thickness between solidified shell and mold wall are analyzed theoretically by taking into account the viscosity change in slit.
The above research work is successfully applied to the development of casting powder for high speed continuous casting over 1.7m/min.