Duplex Steel Vs Super Duplex Steel – Material Information

Duplex Steel vs Super Duplex Steel

Duplex Steel Material has a metallurgical structure that comprises of two stages, 50% austenitic stainless steel and ferrite (body focused cubic cross section) in generally measure up to extents. It is the recent addition to the stainless steel family.  This structure gives all of the Duplex Steel Grade innumerable features such as strength and increased corrosion resistance combined with toughness and ductility. Super Duplex Steel Material, on the other hand offers greater strength and corrosion resistance as compared to its duplex counterpart.

Super Duplex Steel offers greater corrosion resistance as well as increased strength as compared to the Duplex version, especially because of the presence of additional molybdenum, chromium and nitrogen content in the super duplex steel. The same material is used for the fabrication of Duplex steel but the usage ratio varies slightly and the change in ration leads to additional physical and chemical property to the super duplex variant. Duplex steel has a ductile or brittle transition at approximately -50 degrees. The most used duplex stainless steels are the 2205 (22% Chromium, 5% Nickel) and the 2507 (25% Chromium, 7% Nickel); 2507 is known as “super duplex”. Grade of Duplex Steel S32205 are in most cases, tougher than the ferric stainless steel. The corrosion resistance of the least resistant duplex stainless steel are greater than the most commonly used stainless steel variants such as the 304 or the 316. The Duplex Steel S31803 grade has underwent a number of modifications bringing about UNS S32205. The micro constituents of this grade precipitate at temperatures above 300 degrees Celsius and at temperatures below -50, they go brittle. So they aren’t suitable for use at extreme temperatures. The increased marine corrosion resistance of Super Duplex Steel Round Bars makes them the preferred choice for oil & gas as well as the marine industries. The high chromium and molybdenum content in the Super Duplex Steel Pipes makes them suitable for a number of under-water applications especially because of its increased chloride resistance and high mechanical strength. Duplex Steel Sheets & Plates in varied thicknesses such as 0-1 mm, 1-2 mm, 2-3 mm, 3-4 mm, 4-5 mm or >5 mm are generally the preferred versions. The pitting resistance figured by PREN = Cr + 3.3Mo + 16N, will surpass 40 in most material structures.

LDX 2101 is a low nickel, nitrogen based lean duplex stainless steel just like the 304 form, however with substantially higher mechanical quality which enables it to be used in slender cross sections resulting in cost saving. 2304 and 2505 are the most commonly used grades of the duplex genre while 2507 is the preferred super duplex alloy. The Duplex Steel Pipes are widely supplied for a number of commercial purposes. High quality Super Duplex Steel Sheets & Plates UNS S32750 are preferred. Duplex Steel Pipe Fitting and the Duplex Steel Flanges are offered as hot rolled and cold rolled depending upon our customers’ preferences.

We are one of the most professionally acclaimed dealers of Duplex Steel Products including the greatly appreciated Duplex Steel Round Bars. We deliver myriad Super Duplex Steel Products in a number of Super Duplex Steel Grades and according to a various set of specifications. Being an ISO 9001:2008 certified company we ensure that all our Super Duplex Steel Flanges are produced from the materials of supreme quality and in compliance with the ASTM A790/ ASME A790, ASTM A789/ASME SA A789 specifications. We also offer a large collection of Super Duplex Steel Pipe Fittings at a very reasonable and comprehensive price. Contact us for all further details.