Pain Point	ER2209 Solution
❌ Chloride stress corrosion cracking (SCC)	✅ High Ni + Mo + N design – superior SCC resistance vs. 316L
❌ Pitting / crevice corrosion in weld	✅ PREN ≥ 35 – excellent performance in seawater & acidic media
❌ Phase imbalance after welding (excess ferrite)	✅ Precisely controlled chemistry – maintains ~50/50 austenite/ferrite

Typical scenario: When welding 2205 duplex stainless steel, are you worried about weld corrosion failure or insufficient strength? ER2209 is specially designed for offshore platforms, desalination plants, and petrochemical pressure vessels– ensuring weld metal performance matches the base metal.

Ø High-strength duplex weld deposits (760 MPa+)

Ø Outstanding pitting & crevice corrosion resistance

Ø Excellent resistance to chloride stress corrosion cracking

Ø Balanced ferrite-austenite microstructure

Ø Good arc stability & weldability

Ø Suitable for dissimilar welding (duplex to carbon steel)

Ø Field-proven in seawater and chemical environments

Element	C	Cr	Ni	Mo	Mn	Si	N	S	P	Cu
AWS Spec	≤0.03	21.5-23.5	7.5-9.5	2.5-3.5	0.5-2.0	≤0.90	0.08-0.20	≤0.03	≤0.03	≤0.75

Our ER2209 welding wire complies with AWS A5.9. Custom chemical composition is available upon request. Please contact us with your specific requirements.

Feature	ER2209	ER316L
Steel Type	Duplex Stainless	Austenitic Stainless
Strength	Higher(≥760 MPa)	Moderate (≥520 MPa)
SCC Resistance	Excellent	Moderate
Pitting Resistance	≥35	~25
Typical Base Metal	2205 / 2304 duplex	316 / 316L
Offshore Application	Highly Recommended	Limited

For duplex stainless welding, ER2209 is generally preferred because it better maintains duplex phase balance and corrosion resistance.

Parameter	Recommended Value
Heat Input	0.5 – 2.5 kJ/mm
Interpass Temperature	≤ 150°C (300°F)
TIG Shielding Gas	Pure Ar or Ar + 1–2% N₂
MIG Shielding Gas	Ar + 1–3% CO₂
Back Purge Gas	Argon or Ar + N₂ mixture

Welding Notes

To maintain proper duplex phase balance and corrosion resistance, excessive heat input and high interpass temperatures should be avoided during welding.

Nitrogen-containing shielding or purge gases may be used to support austenite formation in critical applications.

Common Industries

• Offshore oil & gas platforms
• Petrochemical and chemical processing
• Desalination plants (high-pressure piping, evaporators)
• Marine engineering (shipbuilding, propeller shafts)
• Heat exchangers & pressure vessels
• Pulp & paper bleaching systems
• Chemical storage tanks

Compatible Base Metals

• Duplex 2205 (UNS S31803 / S32205)
• Duplex 2304
• Ferralium 255
• 3RE60
• Duplex stainless to carbon steel applications

✅Manufacturer with stable quality– many years focused on nickel alloys & specialty stainless welding wire.

✅Batch traceability– Each coil comes with EN 10204 3.1 MTC.

✅Global project experience– Supplied to offshore, desalination, and chemical EPC contractors in Europe, Middle East, SE Asia.

✅Flexible support– OEM branding, cut-length service, ready stock for diameters 1.2mm and 2.4mm.

✅Fast response– Quotation within 24 hours, technical datasheet included.

Looking for a reliable duplex welding wire supplier for your project?

We provide factory direct pricing, mill test certificates and free technical datasheet.

👉Contact us now:

📧 Email: support@ronsteel.com