PURPOSE: To obtain the titled stainless steel having equivalent characteristics as the conventional reheating solution treatment in an on-line system, by rolling the stainless steel slab having the prescribed composition once or more times, prescribing temp. range and accumulated rolling reduction ratio and then cooling the specific average cooling velocity in accordance with C content.

CONSTITUTION: The austenitic stainless steel slab containing by wt% of ≤0.08% C, ≤1.0% Si, ≤2.0% Mn, 16.0W26.0% Cr, 6.0W22.0% Ni, ≤0.30% N is treated as follows: That is, recrystallization of this stainless steel is promoted during hot rolling and in order to obtain soft quality mechanical property after rolling, the rolling, with time between passes ≥10sec in the temp. range of over 1,000°C, is executed once or more times. And, after completing the rolling, in order to restrain the precipitation of carbide during cooling, it is cooled under condition of the average cooling velocity V(°C/sec) to satisfy V≥C3×104 in accordance with C content (%) in the steel in the temp. range of 950W500°C. As a result, the obtd. stainless steel has the equivalent characteristics as the conventional material off-line reheating solution treatment performed.