PURPOSE: To manufacture a Cr-based stainless steel hot rolled sheet excellent in the appearance of the surface and corrosion resistance by subjecting a high corrosion resistant Cr-based stainless steel slab to heating and soaking in a specified atmosphere under specified temp. conditions and executing hot rolling.
CONSTITUTION: The Cr-based stainless steel slab having a compsn. of, by weight (C+N)<0.1% and Cr>13% as well as Ti, Mo or the like so as to satisfy (5×Ti%+Mo%)>1% is subjected to heating and soaking under the conditions satisfying t≤8Cr%-0.38 (T-1100)+100 (heating temp. is T°C and soaking time is t min) in an atmosphere under the conditions in which the residual oxygen concn. (O2%) is regulated to <4.5vol% and the dew point (DP) satisfies the following inequality: DP (°C)<-10logO2%+60), and hot rolling is executed. Scale flaws are not occurred on the surface of the Cr series stainless steel hot rolled sheet contg. Ti, Mo or the like and having more excellent corrosion resistance, and the hot rolled sheet excellent in surface properties can stably be manufactured.
HASHIMOTO SATOSHI
KURE YUKIHIRO
MIKAMI HISAFUMI
