Ferritic stainless steel having excellent ductility and method for manufacturing same

Ferritic stainless steel comprising, by wt %, C:

• 0.005% to 0.1%, Si:
• 0.01% to 2.0%, Mn:
• 0.01% to 1.5%, P:
• 0.05% or less, S:
• 0.005% or less, Cr:
• 10% to 30%, Ti:
• 0.005% to 0.5%, Al:
• 0.01% to 0.15%, N:
• 0.005% to 0.03%, and the balance of Fe and inevitable impurities,
• wherein the ferritic stainless steel comprises an independent Ti(CN) precipitate and a dependent Ti(CN) precipitate formed using a TiN inclusion as precipitation nuclei, and the ferritic stainless steel has a P within a range of 60% or less, the P being defined by Formula 1 below:
• P(%)={NS/(NS+NC)}×100 [Formula 1]
• where NS refers to the number of independent Ti(CN) precipitate particles per unit area (mm2), and NC refers to the number of dependent Ti(CN) precipitate particles per unit area (mm2).

A method for manufacturing ferritic stainless steel, the method comprising casting molten steel as a slab, the molten steel comprising, by wt %, C:

• 0.005% to 0.1%, Si:
• 0.01% to 2.0%, Mn:
• 0.01% to 1.5%, P:
• 0.05% or less, S:
• 0.005% or less, Cr:
• 10% to 30%, Ti:
• 0.005% to 0.5%, Al:
• 0.01% to 0.15%, N:
• 0.005% to 0.03%, and the balance of Fe and inevitable impurities,
• wherein in the casting of the molten steel, the slab is cooled at an average cooling rate of 5° C./sec or less (excluding 0° C./sec) within a temperature range of 1100° C. to 1200° C. based on a surface temperature of the slab.