Duplex Stainless Steel 2205 Pipe
General Properties
Duplex 2205 is a two-phase, ferritic, austenitic 22% chromium, 3% molybdenum, 5 to 6% nickel alloyed stainless steel. It is the most widely used duplex stainless steel grade and is characterized by high yield strength, double that of the standard austenitic stainless steel grades. It also demonstrates good fatigue strength, as well as outstanding resistance to stress corrosion cracking, crevice, pitting, erosion, and general corrosion in severe environments.
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.
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.
Chemical Composition, %
|
Cr |
Ni |
Mo |
C |
N |
|
22.0-23.0 |
4.50-6.50 |
3.00-3.50 |
.030 Max |
0.14-0.20 |
|
Mn |
Si |
P |
S |
Fe |
|
2.00 Max |
1.00 Max |
.030 Max |
.020 Max |
Balance |
Pipe dimension
Out diameter 1/2''-36''
Wall thickness Sch5s-XXS
Length MAX 12M
Characteristics of Duplex 2205
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
Applications:
Chemical processing, transport and storage ¨C pressure vessels, tanks, piping, and heat exchangers
Oil and gas exploration and processing equipment ¨C piping, tubing, and heat exchangers
Marine and other high chloride environments
Effluent scrubbing systems
Pulp and paper industry ¨C digesters, bleaching equipment, and stock-handling systems
Cargo tanks for ships and trucks
Food processing equipment
Biofuels plants
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