SUS 304 and SUS 316 have been traditionally used as building exterior materials, such as roofing and siding. Because they do not have high enough corrosion resistance for use in coastal regions, however, there has been increasing demand for stainless steels that can be employed at low cost in coastal regions. To meet this demand, a new ferritic stainless steel, designated as YUS 220M (22Cr-1.5Mo-Ti, Nb-L C, N) and characterized by high corrosion resistance, formability, and weld toughness, has been developed by minimizing the addition of chromium and molybdenum through the combined addition of titanium and niobium. YUS 220M is being increasingly used in roofing and siding applications.
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