ASTM A**9 Gerneral Service Stainless Steel Pipe
The duplex stainless steel tube has good welding performance. Compared with ferritic stainless steel and austenitic stainless steel pipe, it is not like the welding heat affected zone of ferritic stainless steel, and the plastic toughness is greatly reduced due to severe grain coarsening. Nor is it sensitive to hot cracking of welds like austenitic stainless steel.

Due to its special advantages, duplex stainless steel is widely used in petrochemical equipment, seawater and wastewater treatment equipment, oil and gas pipelines, papermaking machinery and other industrial fields. In recent years, it has also been studied in the field of bridge load-bearing structures. Prospects.

Duplex stainless steel is half of the ferrite phase and austenite phase in its solidified structure, and the minimum phase content may be up to *0%.