METHOD FOR PREVENTING CONTAMINATION OF MOLTEN STEEL IN TUNDISH

摘要

PROBLEM TO BE SOLVED: To provide a method by which the contamination of a molten steel in a tundish is surely suppressed and a cast piece having the objective quality can surely be produced. SOLUTION: An inert gas is blown into a tundish 1 through a piping 2, and an oxygen concentration in the tundish 1 is measured by an O2 sensor 3. When it is detected that the oxygen concentration becomes 1.0 vol.% or less, the filling of a molten steel 11 into the tundish 1 is started. No.10 in Fig. is a ladle storing the molten steel.