SECONDARY REFINING METHOD OF STAINLESS STEEL MOLTEN METAL

摘要

PROBLEM TO BE SOLVED: To maintain temperature of a stainless steel molten metal at high level and enhance decarburization rate without conducting rising heat of the stainless steel molten metal in a vacuum decarbonization treatment of the stainless steel molten metal.SOLUTION: The secondary refining method of a stainless steel molten metal includes supplying oxygen to the stainless steel molten metal under reduced pressure to conduct a vacuum decarbonization treatment, then deoxidizing the molten metal by adding deoxidant while stirring the stainless steel molten metal, further adding an alloy raw material for adjusting components to prepare the stainless steel molten metal with a predetermined component, and an alloy raw material for adding at least one kind of hardly oxidizing element of copper, nickel, molybdenum and cobalt to the stainless steel molten metal is added to the stainless steel molten metal during the vacuum decarbonization treatment at a step that carbon concentration in the stainless steel molten metal becomes 0.02 mass% or less.SELECTED DRAWING: None