F51 (UNS S31803 / Duplex 2205)

About F51 (UNS S31803 / Duplex 2205)

F51 (UNS S31803 / Duplex 2205) is a duplex stainless steel grade combining austenitic and ferritic microstructures for higher strength and improved chloride stress corrosion cracking resistance.

It is commonly selected for offshore, marine, desalination and chemical environments where standard austenitic grades may not provide enough strength or chloride resistance. Anita Metal & Alloys supplies F51 (UNS S31803 / Duplex 2205) in standard as well as non-standard sizes for domestic and export customers.

To learn more about F51 (UNS S31803 / Duplex 2205), message us on WhatsApp and we'll get right back to you.

• F51 (UNS S31803 / Duplex 2205)
• Duplex Stainless Steel
• Cut size supply
• MTC available

Characteristics of F51 (UNS S31803 / Duplex 2205)

F51 (UNS S31803 / Duplex 2205) is chosen for dependable Duplex Stainless Steel performance in engineered components and project supply.

• Reliable performance for engineering and process industry use
• Suitable for stocked and made-to-order supply programs
• Available in common commercial sizes and finishes
• Can be matched with equivalent international specifications
• Supplied with traceability and documentation on request

Chemical Composition / Grade Profile

Final chemistry is supplied as per the ordered standard and confirmed on the material test certificate.

Key Properties

• High strength compared with 300 series stainless steels
• Good resistance to chloride stress corrosion cracking
• Useful pitting and crevice corrosion resistance
• Good fatigue strength for rotating and pressure components
• Requires correct welding procedure to maintain phase balance

Mechanical Properties

Machinability & Fabrication

Machining, forming, welding and heat treatment practice for F51 (UNS S31803 / Duplex 2205) should be selected according to product form, supply condition and the applicable specification.

• Machining parameters should be selected for the final heat condition
• Welding or forming practice should follow the applicable grade standard
• Use sharp tooling and suitable coolant for close-tolerance parts

Applications of F51 (UNS S31803 / Duplex 2205)

• Offshore and subsea components
• Desalination and seawater systems
• Chemical process equipment
• Pumps, valves, fittings and flanges
• Heat exchangers and pressure piping

Available Forms of F51 (UNS S31803 / Duplex 2205)

We can supply F51 (UNS S31803 / Duplex 2205) in mill length, cut length, ready-to-machine sizes and project-specific packing. Availability depends on grade, size, finish and order quantity.

• Round, square, flat and hex bars
• Sheets, plates, coils and strips
• Seamless and welded pipes / tubes
• Pipe fittings, flanges and fasteners
• Forged rings, blocks and custom cut pieces

Need F51 (UNS S31803 / Duplex 2205) in a specific form or size? Message us on WhatsApp and we'll confirm availability.