POSCO Holdings Inc.
FERRITIC STAINLESS STEEL HAVING EXCELLENT RIDGING PROPERTY AND EXCELLENT SURFACE QUALITY AND METHOD OF MANUFACTURING THE SAME

Abstract:

Disclosed herein are a ferritic stainless steel having excellent ridging properties and excellent surface quality of a final product by modifying a microstructure of a central area of a cross-section by further performing cold rolling before hot annealing. A ferritic stainless steel according to the present disclosure includes, by wt %, 0.005 to 0.1% of carbon (C), 0.01 to 2.0% of silicon (Si), 0.01 to 1.5% of manganese (Mn), 0.05% or less of phosphorus (P), 0.005% or less of sulfur (S), 10 to 30% of chromium (Cr), 0.005 to 0.1% of nitrogen (N), 0.005 to 0.2% of aluminum (Al), and the remainder of iron (Fe) and other impurities, wherein a .gamma..sub.max value is in the range of 20% to less than 50%, and a surface microgroove area ratio is 2.0% or less.