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.
What are the features 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
What are the basic properties of Duplex 2205?
Chemical Composition, %
C | Mn | Si | P | S | Cr | Mo | Ni | N | |
2205 (S31803) | 0.03max | 2max | 1max | 0.03max | 0.02max | min: 21.0 max: 23.0 | min: 2.5 max: 3.5 | min: 4.5c max: 6.5 | min: 0.08x max: 0.20 |
2205 (S32205) | 0.03max | 2max | 1max | 0.03max | 0.02max | min: 22.0 max: 23.0 | min: 3.0 max: 3.5 | min: 4.5 max: 6.5 | min: 0.14 max: 0.20 |
Mechanical Properties
Grade | Tensile Strength | Yield Strength | Elongation % | Hardness (HB) MAX |
ksi (min) | 0.2% ksi (min) | |||
2205 | 90 | 65 | 25 | 217 |
What applications is Duplex 2205 used for?
Chemical processing, transport and storage – pressure vessels, tanks, piping, and heat exchangers
Oil and gas exploration and processing equipment – piping, tubing, and heat exchangers
Marine and other high chloride environments
Effluent scrubbing systems
Pulp and paper industry – digesters, bleaching equipment, and stock-handling systems
Cargo tanks for ships and trucks
Food processing equipment
Biofuels plants
