duplex steel

#DUPLEX STEEL SEAMLESS PIPING MATERIALS Duplex stainless steel is a very useful metal that is used the world over. It gets its name from the fact that it consists of two different grades of metal. S31803 Duplex Steel Seamless Pipe has better corrosion resistance and better mechanical properties Duplex steel seamless pipe is a Fe-Ni-Cr alloy that has a two-phase ferritic-austenitic stainless-steel microstructure when it is at room temperature. Duplex Stainless steel pipe are characterised by high chromium (19–28%) and molybdenum (up to 5%) and lower nickel contents than austenitic stainless steels. The most used duplex stainless steel are the 2205 seamless pipe (22% Chromium, 5% Nickel) and the 2507 (25% Chromium, 7% Nickel); 2507 is known as “super duplex steel” due to its higher resistance to corrosion. The advantage of combining ferritic and austenitic grades is that the resultant metal has a metallurgical structure that consists of two phases and therefore benefits from the properties of both microstructures. These properties make duplex steel highly sought after in heavy industries, like oil and gas nuclear and chemical processing.