Duplex 2205 Stainless Steel Ball Valves

High Strength (≥450 MPa Yield): Approximately twice the yield strength of 316/316L, allowing for lighter construction, reduced weight, and higher pressure ratings.

Superior Chloride SCC Resistance: Outstanding resistance to chloride-induced stress corrosion cracking, performing reliably in high-chloride environments where 304/304L and 316/316L fail.

Excellent Pitting and Crevice Corrosion Resistance: PRE (Pitting Resistance Equivalent) ≥ 34 for S31803 and ≥ 35 for S32205, providing reliable service in seawater, brackish water, and aggressive chemical media.

NACE MR0175 / ISO 15156 Compliant: Fully qualified for sour service (H₂S) applications up to 232°C (450°F), with documented HIC and SSC test reports available.

Low Operating Torque: Precision-machined ball and PTFE/PEEK seats provide smooth quarter-turn operation with low torque requirements.

Fire-Safe Design: Available with fire-safe certification (API 607/ISO 10497) for critical offshore and refinery applications.

Anti-Static Device: Optional anti-static design to prevent static electricity accumulation across the valve.

Blow-Out Proof Stem: Stem design prevents accidental blow-out under pressure, ensuring operator safety.

Multiple End Connections: Flanged (ASME B16.5), threaded (NPT/BSP), socket weld (SW), butt weld (BW), and wafer/lug type connections.

Full Range of Types: Floating ball (1/2″–12″), trunnion mounted (2″–48″), three-piece (1/2″–8″), top entry, and V-port control ball valves.

Pressure Ratings: Available in Class 150, 300, 600, 900, and 1500 (PN16 to PN260).

Temperature Range: Suitable for -46°C to 250°C (-50°F to 482°F) depending on seat material.

International Certifications: Valves can be certified by ABS, BV, DNV, LR, GL, RINA, CCS, KR, and NK, and comply with API 607, API 6D, ASME B16.34, NACE MR0175, and NORSOK M-650 standards.

These standards ensure that our Duplex 2205 ball valves meet global requirements for chemical composition, mechanical properties, dimensional tolerances, and pressure-temperature ratings for offshore and sour service applications.

Pressure-Temperature Ratings (per ASME B16.34 – Duplex 2205):

Reference: ASME B16.34 for Duplex 2205 stainless steel ball valves. Derating factors at higher temperatures are more conservative than for austenitic grades due to sigma phase embrittlement risk.

Packing Materials:

Secondary Metal-to-Metal Seats: After PTFE seat burnout, secondary metal seats provide shut-off.

Graphite Stem Seals: Fire-resistant stem packing for emergency sealing.

Anti-Static Device: Spring-loaded plunger ensures electrical continuity between ball and body.

Blow-Out Proof Stem: Stem design prevents accidental ejection under pressure.

Raw Material Selection: High-quality Duplex 2205 (S31803/S32205) stainless steel from certified mills (Outokumpu, Sandvik, POSCO, Baosteel) with certified chemical composition and ferrite/austenite balance verification.

Casting/Forging: Valve body and bonnet cast (CF3M equivalent) or forged to shape. Casting or forging processes controlled to maintain duplex microstructure.

Heat Treatment – Solution Annealing: Valve components solution annealed at 1040–1120°C followed by water quenching. This critical step restores the balanced 40–60% ferrite/40–60% austenite microstructure.

Machining: CNC lathes and machining centers produce precise dimensions – ball cavity, stem bore, flange faces, bolt holes, and seat pockets. Duplex requires proper tooling due to higher strength.

Ball Machining & Polishing: Ball is machined and polished to mirror finish (Ra ≤ 0.4μm) for bubble-tight shut-off.

Seat Machining: PTFE, RTFE, or PEEK seats machined to precise dimensions for proper sealing.

Stem Machining: Stem machined with anti-static spring grooves and blow-out proof shoulders.

Ferrite Content Verification: Random checks to ensure 35–65% ferrite content.

Assembly: Ball, seats, stem, seals, and body assembled in clean environment.

Testing: Hydrostatic shell test, high-pressure seat test, low-pressure air seat test (bubble test), NACE hardness test.

Marking: Laser engraved or stamped with size, pressure, material, heat number, API 6D, NACE MR0175,heat number, and fire-safe markings (if applicable).

Coating: External coating (epoxy or PTFE) for corrosion protection.

Pressure Testing: 100% hydrostatic shell test (1.5× rated pressure), high-pressure seat test (1.1× rated pressure), low-pressure air seat test (80 psi, bubble-tight).

Material Verification: PMI (Positive Material Identification) for body, ball, and stem – verification of Cr, Ni, Mo, N content.

Ferrite Content Measurement: Magnetic induction method – requirement: 35–65% ferrite.

Microstructure Examination: Verification of balanced dual-phase structure, absence of intermetallic phases (sigma, chi).

Hardness Testing: Brinell or Rockwell – max ≤290 HBW / ≤30 HRC. For NACE, ≤22 HRC for 316 components.

Dimensional Inspection: Face-to-face, flange dimensions, ball cavity, stem bore using calibrated instruments.

Leakage Testing: API 598 / ISO 5208 – zero detectable leakage for soft seat valves.

Fire-Safe Testing: API 607 / ISO 10497 (upon request).

NACE Compliance: MR0175 hardness testing and documentation.

Charpy Impact Testing: For offshore applications at -46°C (upon request).

Corrosion Testing: ASTM G48 pitting test (upon request).

Third-Party Inspection: ABS, BV, DNV, LR, GL, RINA, CCS, KR, NK, SGS, TUV on customer request

Offshore Oil & Gas Platforms: Topsides process isolation valves, subsea manifold valves, riser shutdown valves, chemical injection valves (ABS/BV/DNV/LR certified, NORSOK M-650 qualified).

Seawater Systems: Seawater cooling system isolation valves, firewater system valves (ultra-high velocity), ballast water treatment system valves.

Desalination Plants: Brine line isolation valves, high-pressure reverse osmosis (HPRO) feed valves, energy recovery device isolation.

Flue Gas Desulfurization (FGD): Slurry isolation valves, absorber tower valves, quench nozzle isolation, reheat duct valves.

Sour Gas Service (H₂S): Wellhead isolation valves, pipeline block valves, glycol reboiler isolation, amine regenerator valves (NACE MR0175 compliant).

Chemical Processing (Chloride Service): Chloride-containing acid transfer, pulp & paper bleach plant valves, titanium dioxide production.

Oil Refining (Sour Service): Sour water stripper valves, hydrotreater feed/effluent isolation, FCC unit valves.

Marine Engineering (High-Performance): Shipboard seawater cooling, exhaust gas scrubber valves (classification society certified).

Subsea Systems: Subsea manifold isolation, umbilical termination valves, chemical injection point valves (ISO 13628-4 compliant).

Hydrometallurgy: Pressure acid leaching (PAL) valves, solvent extraction isolation, electrowinning solution valves.

Small valves (≤2″): Individual poly bags in carton boxes with foam inserts.
Medium valves (2.5″–8″): Plywood cases with foam padding, each valve separated.
Large valves (≥10″): Wooden crates with protective wrapping, flange protectors, and pallets.

End Protection: Flange protectors for flanged ends (plastic or plywood); plastic caps for threaded ends.

Womic Steel's Delivery Strengths:

Ready stock: 2″–8″ Duplex 2205 ball valves in Class 150 flanged and threaded – dispatch within 24-48 hours.

Direct cooperation with global shipowners for the most competitive freight rates.

Professional loading by in-house teams using padded slings.

Complete documentation including EN 10204 3.1 MTR, PMI reports, ferrite measurement reports, hydrostatic test reports, NACE compliance certificates, and third-party inspection reports.

1. Why choose Duplex 2205 over 316/316L stainless steel for ball valves?
Duplex 2205 offers twice the yield strength (450 MPa vs 170-205 MPa), superior chloride SCC resistance, and higher pitting resistance (PRE ≥35 vs 24-26). For offshore, seawater, and sour gas applications where 316 would fail, Duplex 2205 is the preferred material.

2. What is the difference between S31803 and S32205?
S32205 is a restricted composition range of S31803 with tighter controls on Cr (22.0-23.0% vs 21.0-23.0%), Mo (3.0-3.5% vs 2.5-3.5%), and N (0.14-0.20% vs 0.08-0.20%). S32205 offers higher corrosion resistance (PRE ≥35 vs ≥34) and is generally preferred for new offshore construction.

3. Are Duplex 2205 ball valves suitable for sour service (H₂S environments)?
Yes, Duplex 2205 is fully NACE MR0175 / ISO 15156 compliant for sour service up to 232°C (450°F). We can supply documented HIC (NACE TM0284) and SSC (NACE TM0177) test reports upon request.

4. What is the maximum temperature for Duplex 2205 ball valves?
250°C (482°F) for chloride service; 300°C (572°F) for non-chloride service. Above 300°C risk of sigma phase embrittlement. For higher temperatures, consider super duplex 2507 or austenitic grades.

5. Are these valves fire-safe certified?
Yes, our Duplex 2205 ball valves can be manufactured with API 607 / ISO 10497 fire-safe certification. Fire-safe test reports available upon request.

6. What seat material is recommended for sour gas service?
PEEK (Polyetheretherketone) is recommended for sour gas service due to its excellent chemical resistance, high temperature capability (up to 250°C), and low outgassing properties.

7. Do Duplex 2205 ball valves require special welding procedures for installation?
Yes, Duplex 2205 requires proper welding procedures with low heat input and N₂-containing shielding gas. For buttweld end valves, PWHT is generally not required. We provide welding procedure recommendations upon request.

8. What is the maximum pressure rating for Duplex 2205 ball valves?
Class 1500 (3700 psig at ambient temperature) for trunnion-mounted design. For higher pressures, consider Super Duplex 2507 or Alloy 625 ball valves.

9. What is the difference between floating ball and trunnion mounted ball valves?
Floating ball valves have the ball suspended between seats – suitable for smaller sizes (≤10″) and lower pressures. Trunnion mounted valves have additional stem support at top and bottom – required for larger sizes (≥2″) and higher pressure classes (≥Class 600).

Complete Product Range: Floating, trunnion, three-piece, top entry, V-port – all types available for offshore and sour service.

Strict Quality Control: ISO 9001:2015, API 6D, PED 2014/68/EU, and NORSOK M-650 certified.

NACE MR0175 / ISO 15156 Compliant: Full sour service documentation with HIC/SSC test reports on request.

Fire-Safe Certified: API 607 / ISO 10497 fire-safe testing available.

100% Pressure Tested: Hydrostatic shell test (1.5×), high and low pressure seat tests on every valve.

Ferrite Content Control: 100% documented ferrite measurement (35–65% ferrite).

Full Traceability: Heat number stamped on body – traceable back to original mill certificate with PMI verification.

Flexible Customization: Special end connections, extended stem, locking device, gear operator, pneumatic/electric/hydraulic actuation.

Marine & Offshore Certified: ABS, BV, DNV, LR, GL, RINA, CCS, KR, NK certification available.

Global Delivery: Exported to major offshore, subsea, and sour gas projects worldwide.

Tel / WhatsApp:
Victor: +86 15575100681
Jack: +86 18390957568

E-mail: info@womicstainless.com

Website: www.womicsteel.com

Contact Womic Steel today for a competitive quote on Duplex 2205 stainless steel ball valves. We offer certified quality, NACE MR0175 compliance, API 607 fire-safe certification, ferrite-controlled material, fast production lead times, and reliable global delivery to keep your offshore, subsea, and sour gas projects running smoothly.

Stock Examples (Flanged Duplex 2205 Ball Valves – Class 150 – Floating Type – Fire-Safe):

Stock Examples (Flanged Duplex 2205 Ball Valves – Class 300 – Floating/Trunnion – NACE MR0175):

Stock Examples (Threaded Duplex 2205 Ball Valves – 3000 WOG – Three-Piece – Sour Service):

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