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S31803 steel is ultra-low carbon dual- phase stainless acid resistant steel. It is provided with excellent
pitting corrosion and crevice corrosion resistant performances. In addition, nitrogen, as a strong element
that forms and stabilizes austenite, still ensures the existence of certain amount of austenite in the
structure even if after welding or heating under high temperature, and makes it difficult to form singlephase
ferrite. The dual-phase proportion is not sensitive to the change of heating temperature.
