What is a duplex steel flange

Duplex steel flanges, also known as composite phase steel flanges. A steel composed of a two-phase structure of martensite or austenite and a ferrite matrix. Generally, the steel composed of ferrite and austenite phase structure is called duplex stainless steel, and the steel composed of ferrite and martensite phase structure is called duplex steel. Dual-phase steel is obtained by low-carbon steel or low-alloy high-strength steel after critical zone heat treatment or controlled rolling.

Due to the characteristics of the two-phase structure, through the correct control of the chemical composition and heat treatment process, the duplex stainless steel has the advantages of both ferritic stainless steel and austenitic stainless steel. It combines the excellent toughness and weldability of austenitic stainless steel with iron The combination of high strength and chloride stress corrosion resistance of element stainless steel is the combination of these superior properties that make duplex steel flanges develop rapidly as a weldable structural material.

Duplex stainless steel has good welding performance. Compared with ferritic stainless steel and austenitic stainless steel, it is not like the welding heat affected zone of ferritic stainless steel. Due to the severe coarsening of grains, the plasticity and toughness are greatly reduced. Unlike austenitic stainless steels, it is more sensitive to welding hot cracking.

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