Method for manufacturing duplex stainless steel sheet having reduced inclusions

A method for manufacturing a duplex stainless steel sheet, the method comprising:

• argon oxygen decarburization (AOD), ladle treatment (LT), and twin roll strip casting,
• wherein the AOD comprises:
• deoxidizing molten steel with silicon (Si),
• wherein the molten steel has a silicon (Si) content of 0.55 wt % to 0.75 wt % at an end of the AOD, and
• wherein the duplex stainless steel sheet comprises, by wt %, carbon (C):
• 0.02% to 0.06%, silicon (Si):
• 0.55% to 0.75%, manganese (Mn):
• 2.8% to 3.2%, phosphorus (P):
• 0.035% or less, sulfur (S):
• 0.003% or less, chromium (Cr):
• 19.0% to 21.0%, nickel (Ni):
• 0.5% to 1.5%, copper (Cu):
• 0.3% to 1.2%, nitrogen (N):
• 0.2% to 0.28%, and a balance of iron (Fe) and inevitable impurities.