Duplex Stainless Steel Pipe Grade Comparison Table And Introduction To Performance Parameters

Duplex stainless steel pipe grade comparison table and introduction to performance parameters

Duplex stainless steel pipe has good welding performance. Compared with ferritic stainless steel and austenitic stainless steel, it does not have the welding heat affected zone of ferritic stainless steel. Due to severe grain coarsening, the plasticity and toughness are greatly reduced. 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 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 and has good performance. Prospects. Duplex stainless steel has a solid-quenched structure in which the ferrite phase and the austenite phase account for half each. Generally, the minimum phase content may reach 30%.

 (1) The yield strength is more than twice that of ordinary austenitic stainless steel, and it has sufficient plastic toughness required for forming. The wall thickness of storage tanks or pressure vessels made of duplex stainless steel is 30-50% lower than that of commonly used austenite, which is beneficial to reducing costs.

(2) It has excellent resistance to stress corrosion cracking. Even duplex stainless steel with the lowest alloy content has a higher resistance to stress corrosion cracking than austenitic stainless steel, especially in environments containing chloride ions. Stress corrosion is a prominent problem that is difficult to solve for ordinary austenitic stainless steel.