Thin duplex stainless steel sheet

Abstract

Provided is a thin duplex stainless steel sheet manufactured by a method for manufacturing a thin duplex stainless steel sheet using a twin-roll strip casting process. The thin duplex stainless steel sheet comprising, by weight: 0.1% or less carbon (C) (exclusive of 0%), 0.2-3.0% silicon (Si), 1.0-4.0% manganese (Mn), 19.0-23.0% chromium (Cr), 0.3-2.5% nickel (Ni), 0.15-0.3% nitrogen (N), 0.3-2.5% copper (Cu), a balance of iron (Fe), and inevitable impurities, wherein the thin duplex stainless steel sheet has a necking-down width of 10 mm or less and a recrystallized grain size of 5-8 μm in a rolling direction.

What is claimed is: 
     
         1 . A thin duplex stainless steel sheet manufactured by a method for manufacturing a thin duplex stainless steel sheet using a twin-roll strip casting process, the thin duplex stainless steel sheet comprising, by weight: 0.1% or less carbon (C) (exclusive of 0%), 0.2-3.0% silicon (Si) , 1.0-4.0% manganese (Mn) , 19.0-23.0% chromium (Cr) , 0.3-2.5% nickel (Ni) , 0.15-0.3% nitrogen (N) , 0.3-2.5% copper (Cu) , a balance of iron (Fe) , and inevitable impurities, wherein the thin duplex stainless steel sheet has a necking-down width of 10 mm or less and a recrystallized grain size of 5-8 μm in a rolling direction. 
     
     
         2 . The thin duplex stainless steel sheet of  claim 1 , wherein the thin duplex stainless steel sheet has a yield strength of 430-590 MPa and an elongation of 25-55% in a direction perpendicular to the rolling direction.