POSCO Holdings Inc.
FERRITE-BASED STAINLESS STEEL HAVING IMPROVED PIPE-EXANDING WORKABILITY AND METHOD FOR MANUFACTURING SAME

Abstract:

A ferritic stainless steel for automotive exhaust system parts with improved expandability is disclosed. A ferritic stainless steel with improved expandability according to an embodiment of the present disclosure includes, in percent (%) by weight of the entire composition, Cr: 10 to 25%, N: 0.015% or less (excluding 0), Al: 0.005 to 0.04%, Nb: 0.1 to 0.6%, Ti: 0.1 to 0.5%, the remainder of iron (Fe) and other inevitable impurities, and satisfies the following equation (1) equation (1) (Here, based on the thickness T of ferritic stainless steel, X means [(111)//ND texture fraction]/[(100)//ND texture fraction] of the region from T/3 to 2T/3, and Y means 10*[(100)//ND texture fraction]/[(111)//ND texture fraction] of the region from the surface layer to T/3)