Duplex Stainless Steel

Duplex stainless steel is approximately 50% ferritic and 50% austenitic resulting in a higher strength than either ferritic or austenitic steels. They are resistant to stress, corrosion, cracking and are weldable, but need care in the selection of welding consumables and heat input. Duplex stainless steels types 326, 329, 2304, 2205 and 2507 commonly available have moderate formability, are magnetic, but not as much as the ferritic, martensitic and PH grades due to the 50% austenitic phase.