PURPOSE: To obtain a dead soft high Cr steel by refining a steel bath by blowing under prescribed conditions while keeping the concn. of carbon in the steel bath and the temp. of the bath at a prescribed value each so as to inhibit the oxidation of Cr in the bath.

CONSTITUTION: The concn. of carbon in a steel bath in a refining furnace having a top and bottom blowing function is regulated to ≤2%, and the temp. of the bath is regulated to 1,650W1,800°C. The steel bath is then refined by blowing under conditions which satisfy ≤30 BOC represented by the equation [where Qo2 is the total flow rate (Nm3/min) of gaseous oxygen fed from a lance and a nozzle, W is the amount (ton) of molten steel (%C) is the concn. (wt%) of carbon, and γ is uniform mixing time (sec)]. The oxidation of Cr in the steel bath is inhibited.