The main alloying elements of duplex stainless steel coils include chromium, nickel, molybdenum and nitrogen. The precise ratio of these elements gives them excellent corrosion resistance and mechanical properties. Among them, chromium and molybdenum elements can significantly improve the corrosion resistance of steel, especially in environments containing chloride ions; nickel elements help improve the toughness and weldability of steel; nitrogen element, as an austenite stabilizing element, Helps optimize the metallographic structure of steel.