super duplex steel

ASTM A928 / A928M Standard Specification for Ferritic/Austenitic (Duplex) Stainless Steel Pipe Electric Fusion Welded with Addition of Filler Metal Duplex stainless steel has been widely used, of which 2205 duplex stainless steel is also the most widely used. Corrosion resistance of dual phase steel 1. Pitting corrosion resistance the pitting corrosion resistance of steel depends on the elements of chromium, molybdenum and nitrogen in the steel. The pitting index of several dual phase stainless steels and austenitic stainless steels is compared. PrEN value is generally used to predict the performance of steel in chloride environment. The pitting corrosion resistance of 2205 steel in chlorine environment is better than 18-5Mo section steel and 316L stainless steel. The relationship between CPT value and chloride ion content at 300mV potential shows that 2205 duplex stainless steel is better than 2304 duplex stainless steel. Performance characteristics: 1. Excellent overall corrosion resistance and local corrosion resistance, especially stress corrosion resistance, pitting corrosion resistance, crevice corrosion resistance, corrosion fatigue resistance and wear resistance 2. Good weldability 3. Good comprehensive mechanical properties 4. Good intergranular corrosion resistance 5. High cost performance and long service cycle