Characteristics and Applications of Dual Phase Steel Flanges

Dual phase steel flange, also known as duplex steel flange. A steel composed of martensite or austenite with a ferrite matrix. Generally, steel composed of ferrite and austenite phases is called duplex stainless steel, while steel composed of ferrite and martensite phases is called duplex steel. Dual phase steel is obtained from 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, by correctly controlling the chemical composition and heat treatment process, 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 the high strength and chloride stress corrosion resistance of ferritic stainless steel, It is precisely these superior properties that have led to the rapid development of duplex stainless steel as a weldable structural material.

Duplex stainless steel has good welding performance. Compared with ferritic stainless steel and austenitic stainless steel, it is neither like the welding heat affected zone of ferritic stainless steel, which greatly reduces plastic toughness due to severe grain coarsening, nor is it more sensitive to welding heat cracks like austenitic stainless steel.

Duplex stainless steel, due to its special advantages, is widely used in industrial fields such as petrochemical equipment, seawater and wastewater treatment equipment, oil and gas pipelines, papermaking machinery, etc. In recent years, it has also been studied and used in the field of bridge load-bearing structures, with good development prospects.