HEATER FOR MOLTEN STEEL IN TUNDISH

摘要

PURPOSE:To provide a titled device having no need for any specific lifting mechanism for a torch that can follow up the fluctuation in a molten metal surface during heating by the constitution in which the level of the molten metal surface in a tundish is maintained constant and plasma arc heating is performed for the specified level zone of the molten metal surface. CONSTITUTION:When a small amt. of a molten steel supplied through a long nozzle 2 from a pan 1 into a tundish 3 is dammed up by an overflow gate 11 and stored down to the depth of the gate 11, the low temp. molten steel bath at said part is subjected to plasma arc heating so that the molten metal overflows from the gate 11 at a level X'. The temp. of the molten steel is high and therefore the heating is not required for a standard level Z for which heating is not requied but the molten steel is allowed to overflow from the level 11 at a level Z' by the effect of a front wall 13 and the gate 11. When the level Y at the joint between the pans arrives at the inlet side of a heater C, the wall 13 is immersed in the molten steel and therefore the static pressure in a heating chamber 12 is increased by the supply of the gaseous Ar in the state of heating the plasma arc of the molten steel to lower the molten metal surface down to a level Y' to allow the molten steel to overflow the gate 11 until the gas escapes from the bottom end of the wall 13.