METHOD FOR ADDING LOW BOILING METAL ELEMENT INTO MOLTEN STEEL

摘要

PURPOSE:To improve the yield of a low boiling metal element in a molten steel with the wire addition method by setting the contact position of the low boiling metal and the molten steel at the position deeper than the bottom end of the immersion pipe of a vacuum degassing chamber. CONSTITUTION:The element having the b. p. lower than the b. p. of the molten steel 3 in the ladle 1 is coated with a metallic sheet, is made into a wire shape and is added into the molten steel. While the molten steel 3 in the ladle is returned to the vacuum degassing chamber in this method, the metallic sheet is so added as to melt in the molten steel in the region of the flow 6 of the molten steel which is discharged from the vacuum degassing chamber 2 into the ladle and flows down and the position deeper than the bottom end of the immersion pipe of the chamber 2, for example, A.