Grade 2205 Duplex Stainless Steel

Description

Grade 2205 is a duplex (austenitic-ferritic) stainless steel, renowned for its excellent corrosion resistance, high strength, and good toughness. It consists of approximately 50% austenite and 50% ferrite, combining the best properties of both phases: the corrosion resistance and ductility of austenitic grades (like 316) and the high strength and stress corrosion cracking resistance of ferritic grades. 2205 contains 21.0-23.0% chromium, 4.5-6.5% nickel, and 3.0-3.5% molybdenum, along with nitrogen (0.14-0.20%) to enhance strength and corrosion resistance. It is magnetic (due to the ferritic phase) and offers superior resistance to pitting, crevice corrosion, and stress corrosion cracking, especially in chloride-containing environments such as marine, chemical, and offshore applications. 2205 has good weldability and formability, and its high strength allows for thinner section designs, reducing weight and cost. It is widely used in demanding corrosive environments where both strength and corrosion resistance are critical.

Chemical Composition (wt%)

C ≤ 0.03, Cr: 21.00-23.00, Ni: 4.50-6.50, Mo: 3.00-3.50, Mn ≤ 2.00, Si ≤ 1.00, P ≤ 0.030, S ≤ 0.020, N: 0.14-0.20

Mechanical Properties

Tensile Strength ≥ 620 MPa, Yield Strength ≥ 450 MPa, Elongation ≥ 25%, Hardness ≤ 290 HB

Advantages

Excellent corrosion resistance (pitting, crevice, stress corrosion cracking) in chloride environments; high strength (twice that of austenitic grades like 316); good toughness and ductility; magnetic; good weldability and formability; cost-effective for high-stress, corrosive applications.

Applications

Marine equipment, offshore structures, chemical processing tanks and piping, desalination plants, oil and gas pipelines, and wastewater treatment equipment.

Equivalent Grades

AISI 2205, UNS S31803, EN 1.4462, GB 022Cr22Ni5Mo3N

 

Stainless Steel Suppliers

If you have project requirements for stainless steel, we welcome your order. GNEE has a large inventory of popular products for you to choose from. It can be processed into various practical product forms, including plates, coils, tubes, bars, wires, etc. For detailed chemical composition information and free samples, please contact our factory immediately. We offer competitive prices and excellent service.Email: info@gneestainless.com

 

Testing and Documentation: Factory test certificate, EN 10204 3.1, chemical report, mechanical report, destructive testing report, non-destructive testing report, PMI test report, visual inspection report, third-party inspection report, NABL certified laboratory report.
Packaging: Wooden crate packaging, bubble wrap packaging, steel strapping, or packaging according to customer requirements.