Hot Rolled Super Duplex Stainless Steel Plate 2205 S31803

Gnee Super Alloy (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of hot rolled super duplex stainless steel plate 2205 s31803 in China. If you're going to wholesale high quality hot rolled super duplex stainless steel plate 2205 s31803 made in China, welcome to get free sample from our factory. Good service and reasonable price are available.

Duplex stainless steels have a combination of two phases, ferrite and austenite in approximately equal measure. This allows them to benefit from the advantages of both austenitic and ferritic stainless steels, leading to increased strength, improved weldability, higher toughness and resistance to several types of corrosion. Commercially, they are also cheaper than austenitic stainless steels due to their lower nickel content.

Duplex stainless steel was developed in Sweden in 1930, but commercial production didn't commence until the 1970s due to the very complicated process of its production. There has been a re-emergence in the steel in modern times after significant advances in steelmaking techniques have made it easier to produce it. However, they are still a relatively under-utilised group of stainless steels, with the world's usage only between 1 – 3% due to the limitations of their application.

The microstructure of duplex stainless steels features both the crystallographic structures of approximately 50% ferrite (a body-centred cubic structure) and 50% austenite (a face-centred cubic structure). Both of these phases co-exist as a stable mixture, unlike two-phase alloys, where one of the two phases manifests as precipitates. The alloying elements in duplex stainless steels are either ferritisers (e.g. chromium, silicon, molybdenum) or austenitisers (e.g. carbon, nickel, nitrogen), which means they favour the formation of the ferritic and austenitic phases, respectively.

At high temperatures, the relatively unstable ferrite phase in duplex steels gets converted into the undesirable α' (alpha prime) phase, which causes a decrease in their mechanical properties, such as strength and toughness, and also in their corrosion resistance. This phenomenon is called embrittlement [1]. The worst temperature at which embrittlement occurs is at 475 oC; however, the production of the alpha prime phase may start to occur at temperatures as low as 300 oC, and this limits the maximum service temperature of duplex steels.

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