Alloy 2205 Duplex Stainless Steel

Chemical Analysis
C Carbon
.03 max
Mn Manganese
2.00 max
P Phosphorus
0.030 max
S Sulfur
0.020 max
Si Silicon
1.00 max
Cr Chromium
22.00 – 23.00
Mo Molybdenum
3.00 – 3.50
Ni Nickel
4.50 – 6.50
N Nitrogen
0.08 – 0.20

General characteristics of Alloy 2205 Duplex Stainless Steel

Alloy 2205 is a duplex stainless steel with a microstructure of austenite plus ferrite. The duplex microstructure, together with the alloy’s chemical composition, result in an excellent combination of strength and corrosion resistance.


The alloy is used in high-pressure fuel injector systems, oil and gas production equipment such as valves, fittings, shafts and pump parts, heat exchangers in chemical and pulp and paper plants, and brewing tanks. The alloy may be considered for applications where the strength and corrosion resistance of type 316 are lacking


Forging is carried out from a uniform temperature of 2000/2100ºF (1095/1150ºC) with reheating as required, followed by air cooling. It should be noted that this grade is very soft at forging temperatures and as such may need support during forging.

Heat treatment

Annealing is carried out at 1850/2050ºF (1010/1120ºC) followed by a rapid quench in air or water. No other heat treatments are performed on this alloy. It can only be hardened by cold work.


The alloy is somewhat more difficult to machine than type 316 stainless, and machines to give tough, stringy chips. The use of chip curlers and breakers is recommended.


The alloy may be welded using many of the available resistance methods. Oxyacetylene welding is not recommended due to the danger of carbon pickup. Autogeneous welding will increase the amount of ferrite in both the weldment and the heat-affected zone. For service in severe environments a postweld anneal is recommended, otherwise such a treatment is not required.

To Send a Request for Quote, please Click Here, or call 1.973.276.5000 or fax 1.973.276.5050.