A method for the production of austenitic stainless steel plates with a high corrosion resistance and high mechanical strength at ambient temperature and at high temperatures

摘要

PURPOSE:To manufacture the titled steel material inexpensively by hot rolling austenitic stainless steel slab at recrystallization range of austenite, then cooling the plate acceleratedly under a suitable condition. CONSTITUTION:Austenitic stainless steel slab is heated to =1,000 deg.C to allow Cr carbide thoroughly to be formed solid soln. in matrix. Next, the heated slab is hot rolled at recrystallization range of austenite to make uniform the structure. In the process described, above in case the strength is further improved, it is favorable to apply rolling down in recrystallization range of austenite, and also in unrecrystallized range of austenite to hot roll the slab at =800 deg.C. Next, the obtd. hot rolled steel plate is cooled acceleratedly to at least 550 deg.C by =2 deg.C/sec average rate, to prevent deterioration of corrosion resistance due to ppt. of Cr carbide, etc. in the midway of cooling. In this way, the titled steel having high yield strength in normal and high temp. ranges is obtd.