UNS S31803 (2205) Duplex stainless steel is a high performance alloy with a unique combination of excellent mechanical properties and exceptional corrosion resistance. The following introduces the key performance characteristics of UNS S31803 stainless steel:

Corrosion resistance: UNS S31803 has excellent resistance to general corrosion, pitting corrosion, crevice corrosion and stress corrosion cracking.
The high chromium (21-23%) and molybdenum (2.5-3.5%) content in UNS S31803 provides excellent protection from a variety of corrosive environments, including seawater, chlorides, acids and various chemicals.
This enhanced corrosion resistance makes UNS S31803 ideal for applications in harsh, corrosive environments such as offshore, marine and chemical processing industries.

Mechanical Properties: UNS S31803 offers high strength and toughness, with typical tensile strengths of 620 to 860 MPa and yield strengths of 450 to 650 MPa.
The dual-phase microstructure consisting of balanced austenite-ferrite phases contributes to the material’s excellent mechanical properties.
UNS S31803 retains good impact toughness even at low temperatures, making it suitable for applications where impact resistance is critical.

Fatigue and Wear Resistance: The dual-phase microstructure and high strength of UNS S31803 provide excellent fatigue and wear resistance, making it suitable for parts subject to cyclic loading or high stress applications.
This performance characteristic is particularly beneficial in applications where components such as movable bridges are particularly subject to repeated stress and wear.

Thermal and Low Temperature Performance: UNS S31803 maintains its mechanical properties and corrosion resistance at both high and low temperatures, allowing it to be used in both low and high temperature environments.
The material’s thermal stability and resistance to brittleness make it suitable for applications in the petrochemical, power generation and liquefied natural gas (LNG) industries.

Solderability and Fabrication: UNS S31803 is considered weldable, although it requires more careful control of welding parameters to maintain the required ferrite-austenite balance and prevent the formation of harmful phases.
With appropriate welding techniques, UNS S31803 can be fabricated into a variety of components and structures, including tanks, pipes, and other process equipment.

The combination of excellent corrosion resistance, high strength and thermal stability makes UNS S31803 duplex stainless steel a versatile, high-performance material suitable for a variety of industrial applications, especially where traditional stainless steel or carbon steel may not provide environment with sufficient performance.