Encyclopedia 2205 duplex stainless steel

Mondo Home Updated on 2024-03-07

2205 duplex stainless steel (UNS S31803 S32205, also known as Duplex 2205 or F60) is an austenitic-ferritic duplex stainless steel containing chromium, nickel, molybdenum, and nitrogen. Its chemical composition is approximately:

Chromium (CR): 210 - 23.0%

Nickel (Ni): 45 - 6.5%

Molybdenum (Mo): 25 - 3.5%

Nitrogen (n): 008 - 0.20%

Features of 2205 Duplex Stainless Steel:

Corrosion resistance: It has good resistance to pitting, crevice corrosion and stress corrosion cracking, and is especially excellent in the corrosion resistance in chloride ion environment.

Strength and toughnessDue to its unique duplex microstructure (about 50% austenite + 50% ferrite), 2205 stainless steel has both high strength (usually tensile strength above 550 MPa) and excellent toughness.

Weldability: Although the welding process requires special control to prevent changes in the structure of the heat-affected zone, with proper welding methods and post-treatment, 2205 stainless steel can achieve good welding results.

Processability: Although harder and more work-hardened than conventional austenitic stainless steels, cold and hot forming can still be performed with the correct selection of machining parameters.

Applications: Chemical and petrochemical industry: used to make pressure vessels, pipe fittings, valves, etc.

Marine: marine equipment, seawater systems and coastal facilities.

Oil & Gas Industry: Drilling Platforms, Pipelines, Storage Tanks.

Construction industry: fasteners and structural components in bridges, building structures.

In accordance with ASME B1611 standard, 2205 duplex stainless steel can be manufactured into socket fittings and threaded fittings, which are widely used in these industries. At the same time, the material is also suitable for other relevant standards such as ASTM A240, A240M and EN 10088-2.

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