Duplex steel has mixed microstructure of austenite and ferrite stainless steels. Duplex stainless steels have roughly twice the strength compared to austenitic stainless steels and also improved resistance to localized corrosion. They are characterized by high chromium (19–32%) and molybdenum (up to 5%) and lower nickel contents than austenitic stainless steels.

Applications:

• Heavy machinery
• Compressors
• Bridges