Duplex stainless steel tube has good welding performance, compared with the ferritic stainless steel and austenitic stainless steel, it is neither like ferritic stainless steel weld heat affected zone, due to a serious coarsening of crystal and make the plastic toughness sharply lower, also don't like austenitic stainless steel welds is sensitive.

Duplex stainless steel tube because of its special advantages, is widely used in petroleum chemical industry equipment, water and waste water treatment equipment, oil gas transmission pipeline, paper making machinery and other industrial areas, has also been used for bridge bearing structure field in recent years, has the very good development prospect.

Duplex stainless steel tube is half of the ferrite phase and austenitic phase in its cementing tissue, and the normal minimum phase may be up to 30%.