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2205 Seamless & Welded Pipe
Duplex 2205/s31803 Seamless Welded Pipes are made up of alloys that have both austenitic and ferritic properties. These properties allow these pipes to withstand corrosion, and these pipes also have excellent tensile strength. The 2205 Seamless Welded Pipes consist of about 22 percent chromium, 3 percent molybdenum, and 5 to 6 percent nickel.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 UNS S31803 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
Duplex 2205 Seamless Welded Pipes can withstand a temperature up to 572 degrees Fahrenheit. If the pipes are left with more than the mentioned temperature, it might lead to the embrittlement of the pipes. As the chemical composition consists of these elements, they are also very resistant towards corrosion pitting and corrosion cracking which could be beneficial at a temperature ranging from 302 degrees Fahrenheit. There also is a certain amount of ferrite present in this alloy, which enhances the performance of these pipes. Thus, these pipes can be used in environments where they could be subjected to unfavorable conditions. These are also very beneficial in areas where chloride-related stress cracking can occur, as these pipes would work great in those conditions.
Corrosion Resistance
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.
- High resistance to chloride stress corrosion cracking
- Resistance to chloride pitting and crevice corrosion
- Good general corrosion resistance
- Good sulfide stress corrosion resistance
- High Strength
- Good weldability and workability
- Chemical process vessels, piping and heat exchangers
- Pulp mill digesters, bleach washers, chip pre-steaming vessels
- Food processing equipment
- Oil field piping and heat exchangers
- Flue gas desulfurization equipment