Duplex Steel UNS S32205 Round Bar

Duplex stainless steel gets its name from a dual-phase microstructure of approximately half ferrite and half austenite. This balance delivers a combination that single-phase steels cannot: the high strength of ferritic steel together with the corrosion resistance and toughness of austenitic steel.

UNS S32205 is the current, tightly controlled specification for 22% chromium duplex, marketed as Duplex 2205 and designated F60 under ASTM A182. A UNS S32205 round bar is a chromium-nickel-molybdenum alloy bar, produced by hot rolling, forging, or cold finishing, used as machining stock for shafts, valve and pump components, fasteners, shaft seals, rudders, propellers, and fabrications operating in aggressive chloride environments.

The grade’s chemistry drives its performance: about 22% chromium and 3% molybdenum for pitting resistance, 5% nickel for toughness, and a controlled higher nitrogen level of 0.14 to 0.20% that stabilises the austenite phase, raises strength, and improves weldability. The result is an F60 round bar with a minimum yield strength of 450 MPa, roughly double that of grade 316.

The “2205” family has two UNS numbers, S31803 (the original, F51) and S32205 (the modern refinement, F60). They share the same trade name and Werkstoff number (1.4462), but S32205 was introduced to tighten the chemistry.

The higher guaranteed nitrogen in S32205 improves phase balance after welding and raises the pitting-resistance floor, which is why newer specifications and offshore standards call it out specifically. Because the S32205 range sits within the S31803 range, most modern mill bar is dual-certified to both, so one heat covers either call-out. If your drawing references the original specification, see our Duplex UNS S31803 Round Bar page. Jade Alloys stocks dual-certified 2205 wherever possible.

The table below gives the ASTM A276 composition limits for UNS S32205 (F60). Note the higher minimum nitrogen versus the older S31803.

The tighter chromium and molybdenum bands combined with the higher nitrogen floor give the Duplex Steel UNS S32205 bar more consistent corrosion performance and a reliable phase balance after fabrication.

Typical minimums for solution-annealed S32205 round bar and F60 rod per ASTM A276 / A479.

Physical Properties

The high yield strength lets designers reduce wall thickness and component weight, valuable for subsea hardware, pressure vessels, and structural components where mass and corrosion both matter.

Both S32205 (F60) and the original S31803 (F51) share Werkstoff number 1.4462 and the 2205 trade name. The modern S32205 differs by its higher minimum nitrogen and tighter composition control.

We hold ready stock across every common form and finish. If your enquiry references a spec, UNS number, or Werkstoff number rather than a plain trade name, this list confirms we cover it.

Whether you need us as a Duplex UNS S32205 round bar manufacturer, a DIN 1.4462 bright bar supplier, or an ASTM A276 F60 hex bar exporter, a single enquiry covers stock, cutting, and certification.

All size and weight tables for S32205 round bar and its related profiles are gathered here for easy reference.

ASTM A479 UNS S32205 Round Bar Size Chart

We supply S32205 round bar across metric, imperial, and Japanese size systems.

Standard mill lengths run 0.5 to 6 metres, with cut to length available to reduce machining waste and freight cost on export orders.

UNS S32205 Round Bar Weight Chart

Theoretical weights for solid round bar at a density of about 7.8 g/cm3. For any size not listed, use our metal weight calculator.

ASTM A479 UNS S32205 Hex Bar Weight Chart

ASME SB276 F60 Square Bar Weight Chart

DIN 1.4462 Flat Bar Sizes

ASTM A276 F60 Duplex Hollow Bar Sizes

Representative S32205 hollow bar stock (OD = outside diameter, ID = inside diameter). Full range spans 32 mm OD up to 275 mm OD.

Weights and sizes are indicative; confirm against certified material for billing.

Surface Finish Codes

Supply Condition

Peeled bars are available in diameter 15 mm to 120 mm, and cold-drawn bright bar in diameter 2.5 mm to 14 mm, with a surface finish from 0.5 to 1.5 micrometre and straightness of 0.5 to 1 mm per metre.

• Offshore oil & gas: subsea manifolds, wellhead components, valve stems, and pump shafts in chloride and sour service.
• Desalination: high-pressure pump shafts, valve internals, and fasteners in RO and MSF plants.
• Chemical and petrochemical: agitator shafts, reactor internals, and heat-exchanger components.
• Marine and shipbuilding: propeller shafts, rudders, shaft seals, deck fittings, and structural pins.
• Pulp and paper: digesters and bleach-plant hardware resistant to chloride attack.
• Pressure vessels and structural: weight-saving, high-strength corrosion-resistant components.

Every consignment of S32205 round bar ships with:

• EN 10204 3.1 mill test certificates traceable to the heat number
• Chemical composition and mechanical test reports
• Ferrite content verification, essential for duplex phase balance
• PMI (Positive Material Identification) on request
• Pitting corrosion test (ASTM G48) on request
• NACE MR0175 / ISO 15156 compliance statements for sour service
• Third-party inspection by Lloyd’s, BV, SGS, DNV, or TUV on request
• Testing through NABL-approved laboratories

Correct phase balance (typically 40 to 60% ferrite) and solution-anneal condition are essential to duplex performance, and our documentation confirms both. See our quality policy and certificates for more.

As a government-recognised export house, Jade Alloys ships Duplex UNS S32205 round bars worldwide with EN 10204 3.1 documentation, Certificate of Origin, and ISPM 15-compliant packing.