PURPOSE: To obtain a ferritic stainless steel sheet excellent in surface properties, ridging properties and workability.
CONSTITUTION: The slab of ferritic stainless steel showing the two phase structure of ferrite + austenite in a hot working temp. region and having a balance of chemical components in which γ max conforming to the formula (1) is regulated to 10 to <35 as well as contg. B is produced. This slab is heated to 1150 to 1250°C, and rough hot rolling is started. The finish hot rolling is completed at ≥860°C finish rolling outlet side temp. at ≥7.0m/s finish rolling outlet side rate, and it is coiled at 650 to 900°C. After that, cold rolling and recrystallization annealing are executed. The austenitic phase granularly dispersed by the incorporation of B is subjected to the high speed high temp. hot rolling in a state in which it is coexistent with the ferritic phase, by which the refining of the ferritic phase and the accumulation of strains are promoted. In this way, the ferritic stainless steel sheet securing good surface properties and high productivity and excellent in ridging properties and workability can be obtd.
UEMATSU YOSHIHIRO