We are the Suppliers of Super duplex stainless steel .It differs from duplex in that it is a steel with pitting corrosion resistance. They are a highly alloyed steel often with 25% chromium or more. They have the same high strength and resistance to stress corrosion, fatigue and erosion as duplex as well as offering a great resistance to chloride elements that can cause stress corrosion cracking. Couple this with a high thermal conductivity rate as well as a low coefficient of thermal expansion and super duplex quickly becomes the stainless steel of choice for many.
|Minimum Order Quantity||10 Kilogram|
|Unit Pipe Length||Customized, 9 meter, 6 meter, 3 meter|
|End Connection||Threaded, Beveled End, Plain End|
ASTM A 182, A 240, A 276,
A 789, A 790, A 815
UNS S31803, S32205
Forms of Duplex 2205 Available at Nascent Pipe And Tubes
· Pipe & Tube (welded & seamless)
2205 Duplex Overview
Duplex 2205 is a nitrogen enhanced duplex stainless steel that was developed to combat common corrosion problems encountered with the 300 series stainless steels. "Duplex" describes a family of stainless steels that are neither fully austenitic, like 304 stainless, nor purely ferritic, like 430 stainless. The structure of 2205 duplex stainless steel consists of austenite pools surrounded by a continuous ferrite phase. In the annealed condition, 2205 contains approximately 40-50% ferrite. Often referred to as the work horse grade, 2205 is the most widely used grade in the duplex family of stainless steels.
The advantage of a duplex structure is that it combines the favorable qualities of a ferritic alloy (stress corrosion cracking resistance and high strength) with those of an austenitic alloy (ease of fabrication and corrosion resistance).
Usage of 2205 Duplex stainless steel should be limited to temperatures below 600 Degree F. Extended elevated temperature exposure can embrittle 2205 stainless.
2205 duplex stainless steel is a cost effective solution for many applications where the 300 series stainless steels are susceptible to chloride stress corrosion cracking. Stress corrosion cracking occurs when stainless steels are subjected to tensile stress, while in contact with solutions containing chlorides. Increasing temperatures also increase the susceptibility of stainless steels to stress corrosion cracking.
The combination of chromium, molybdenum and nitrogen convey the good resistance of 2205 to chloride pitting and crevice corrosion. This resistance is extremely important for services such as marine environments, brackish water, bleaching operations, closed loop water systems and some food processing applications. The high chromium, molybdenum and nitrogen contents of 2205 provide corrosion resistance superior to common stainless steels, such as, 316L and 317L in most environments.
Chemical Composition, %
Specified Tensile Properties ASTM A240
.2% Yield Strength, ksi Minimum
31 Rockwell C