Improvement of casting conditions for ultra-clean steels in long-repeated operation of tundish under hot conditions

摘要

In order to prevent oxidation of molten steel in long- repeated operation of a tundish under hot conditions, the bhaviors of residual sag and steel were investigated. The reduction of (FeO) and (MnO) in a tundish by Means of repeated opration of the tundish without pre- Heating and with slag conditioning in the tundish made It possible to reduce the inclusion in cast slab. Moreover, the No. 4CC 1st strand caster can produce Ultra-clean steels and reduce coil defects.