METHOD FOR COOLING CONTINUOUSLY CAST BILLET OF FERRITIC STAINLESS STEEL CONTAINING NIOBIUM

摘要

PURPOSE:To prevent the cracking of a continuously cast billet of a ferritic stainless steel contg. Nb by reheating the billet at a specified temp. without cooling to =300 deg.C and by cooling it at a specified average cooling rate to obtain a cooled billet. CONSTITUTION:A contiuously cast billet of a ferritic stainless steelcontg. 0.1wt% Nb and 10wt% Cr is heated once at 800-1,300 deg.C for 1-10hr without cooling to =100 deg.C. It is then cooled to 300 deg.C at =40 deg.C/hr average cooling rate to obtain a cooled billet.