Duplex Stainless Steel 2205

Duplex Stainless Steel 2205 is a widely used duplex grade with a microstructure consisting of both austenitic and ferritic phases. Compared with 304 and 316L, it offers significantly higher strength together with excellent resistance to pitting, crevice corrosion, and chloride stress-corrosion cracking, making it particularly suitable for demanding marine, chemical, and oil & gas environments.

Appearance & Properties

Color: Silver-gray to bright silver

Density: Approx. 7.8 g/cm³

Tensile Strength: Typically ≥620 MPa (annealed condition, depending on standard and product form)

Corrosion Resistance: Excellent

Machinability: Moderate to difficult

Weldability: Good

Strength: High

Magnetism: Magnetic

Surface Finishes: Passivation, pickling, polishing, grinding, bead blasting, etc.

Typical Applications

Duplex Stainless Steel 2205 is widely used in oil & gas, marine engineering, chemical processing, energy, pulp and paper, and industrial fluid-handling equipment.

Typical parts include valve bodies, pump components, flanges, pipe fittings, valve stems, shafts, pressure equipment components, offshore connectors, and corrosion-resistant precision CNC parts.

Advantages

• Significantly higher strength than 304 and 316L

• Excellent resistance to pitting and crevice corrosion

• Good resistance to chloride stress-corrosion cracking

• Suitable for marine and chemical environments

• Excellent combination of strength and corrosion resistance

Limitations

• More difficult to CNC machine than common austenitic stainless steels

• Higher cutting forces and tool wear during machining

• Welding requires more careful process control

• Material and machining costs are generally higher than 304