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Duplex stainless steel pipe has good welding performance. Compared with ferritic stainless steel and austenitic stainless steel, it is not like the heat-affected zone of welding of ferritic stainless steel. The plastic toughness is greatly reduced due to the severe coarsening of grains. It is also not as sensitive to welding hot cracks as austenitic stainless steel.
Due to its special advantages, duplex stainless steel is widely used in petrochemical equipment, seawater and sewage treatment equipment, oil and gas pipelines, paper machinery, and other industrial fields. In recent years, it has also been researched and applied to the field of bridge load-bearing structures, and has very good development prospects.
Duplex stainless steels have a ferrite phase and an austenite phase half of each in the solid-quenched structure. Generally, the minimum phase content may reach 30%.