2205 is a duplex stainless steel material among stainless steels.

Chinese brand: 00Cr22Ni5Mo3N, F51/F60. US grade: UNS S31803/S32205. German brand number: 1.4462.

2205 (S31803, F51, 1.4462) duplex stainless steel, 2205 duplex steel is a nitrogen-added duplex stainless steel (referred to as 2205 duplex steel), 2205 duplex steel is composed of 21 chromium, 2.5 Duplex stainless steel composed of molybdenum and 4.5 nickel-nitrogen alloy. At present, domestic 2205 dual-phase steel product types include welded pipes, seamless pipes, steel plates, bars, forged materials, strips, etc. Early duplex stainless steels were resistant to moderate uniform corrosion and chlorine stress corrosion cracking, but their properties were significantly reduced when used in welding situations. In order to improve this situation, nitrogen is added to 2205 dual-phase steel, which not only improves the corrosion resistance, but also makes the welding condition very good. It has high strength, good impact toughness and good overall and local resistance to stress corrosion.