Duplex 2205 (UNS S31803) Valve Manufacturer

Duplex 2205 stainless steel valve manufacturer in India. Gate, globe, ball, check valves in UNS S31803/S32205. Pitting resistant for offshore, desalination, chemical. NACE MR0175. Export worldwide.

Request Quote Talk to Our Engineers

Why Duplex 2205 for Valves?

Duplex 2205 (UNS S31803/S32205) is a two-phase austenitic-ferritic stainless steel offering roughly twice the yield strength of SS316 with superior resistance to pitting, crevice corrosion, and stress corrosion cracking. Its PREN (Pitting Resistance Equivalent Number) of 34-35 makes it ideal for chloride-bearing environments where SS316 fails. The high strength allows thinner wall sections, reducing weight by up to 30% compared to equivalent SS316 designs.

Duplex 2205 Valve Specifications

ParameterSpecification
Material GradeUNS S31803 / S32205 (ASTM A182 F51, A351 CD3MN)
Size Range1/2" to 24" (DN15 to DN600)
Pressure ClassClass 150 to 2500
End ConnectionsFlanged RF/RTJ, Butt Weld, Socket Weld, Threaded
Design StandardsAPI 600, API 602, API 6D, ASME B16.34
TestingAPI 598, ASTM A923 (Detrimental Phases), Ferrite Content 35-65%
ComplianceNACE MR0175 / ISO 15156, PED 2014/68/EU
TrimDuplex-to-Duplex, Stellite 6, Inconel 625 overlay

Valve Types in Duplex 2205

Floating & Trunnion Ball Valve
Gate Valve (Solid Wedge & Flexible Wedge)
Globe Valve (Straight, Angle, Y-Pattern)
Check Valve (Swing, Dual Plate, Piston)
Butterfly Valve
Needle Valve
Plug Valve

Key Applications

Offshore oil & gas platforms
Subsea production systems
Seawater desalination (RO/MED/MSF)
Chemical & petrochemical plants
Pulp & paper — bleach plants
FGD (Flue Gas Desulfurization)
Marine & shipbuilding
Phosphoric acid plants

Frequently Asked Questions

What is the difference between Duplex 2205 and Super Duplex 2507?
Duplex 2205 (PREN ~35) is the workhorse grade for moderate chloride environments. Super Duplex 2507 (PREN ~42) has higher Mo and N content, offering superior pitting resistance for aggressive environments like hot seawater, concentrated brines, and acidic chloride solutions. 2507 costs ~30% more than 2205.
Can Duplex 2205 valves be used for sour service?
Yes. Duplex 2205 is listed in NACE MR0175 / ISO 15156-3 for sour service with specific limitations on hardness (≤28 HRC) and environmental conditions. Solution-annealed and water-quenched condition with ferrite content 35-65% is required. We supply with full NACE compliance documentation.
What is the maximum service temperature for Duplex 2205?
The recommended maximum continuous service temperature is 250°C (480°F). Above this, prolonged exposure can cause 475°C embrittlement due to sigma/chi phase precipitation. For higher temperatures, consider austenitic grades (SS316, SS321) or nickel alloys.
Do you test for detrimental intermetallic phases?
Yes. All our Duplex 2205 valves are tested per ASTM A923 (Methods A, B, and C) to verify absence of detrimental intermetallic phases (sigma, chi). Ferrite content is verified by ferritoscope (35-65% per NORSOK M-630). Impact testing at -46°C is standard.

Related Pages

Super Duplex 2507 Valve Manufacturer → Hastelloy Valve Manufacturer → Monel Valve Manufacturer → Duplex vs Super Duplex Guide → Titanium Valve Manufacturer →

Need a Quote?

Share your specifications — our engineers respond within 24 hours with competitive pricing and technical documentation.

Get Quote WhatsApp Us