Duplex steel refers to duplex stainless steel. Steel mainly composed of ferrite phase and martensite phase can be obtained by critical zone treatment or controlled rolling of low carbon steel or low alloy steel. Due to the characteristics of dual-phase structure, dual-phase stainless steel has the advantages of ferritic stainless steel and austenitic stainless steel by correctly controlling chemical composition and heat treatment process. 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 these excellent properties that make duplex stainless steel develop rapidly as a weldable structural material. Since 1980s, it has become a steel grade alongside martensitic, austenitic and ferritic stainless steels.

In addition: 2205 dual-phase steel is equivalent to domestic 022Cr23Ni5Mo3N. 3 16L？ Is the standard brand in China 022Cr 17Ni 12Mo2 in price? Could it be dual-phase steel? But in terms of use, it is common that 3 16L is safer.