Stainless Steel ER2209
UNS S39209 · EN 22 9 3 N L
ER2209 (S39209, EN 22 9 3 N L) is a nitrogen-bearing duplex stainless bare filler wire matched to 2205 base metal, depositing a balanced ferrite/austenite weld structure.
Reference datasheet — ER2209 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the AW condition
ER2209 tempers and conditions
ER2209 is supplied in 5 conditions, soft to hard. AW is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed 1050–1100 °C, water quenched | Select when the weldment (e.g. cast or overlay component) is re-solution annealed, restoring phase balance and dissolving nitrides/sigma at the cost of strength. | 510 | 760 | 32 | 21 HRC | 2.3 % IACS |
As-welded, submerged arc with basic duplex flux | Use for heavy-section plate and pipe seams at high deposition rate; toughness is the lowest of the processes due to flux interaction and high heat input. | 610 | 800 | 25 | 23 HRC | 2.2 % IACS |
As-welded, TIG with Ar (or Ar+2%N₂) shielding | Choose for root passes, thin wall and tube welding; cleanest weld metal with the highest toughness, especially with nitrogen-added shielding/backing gas. | 620 | 810 | 30 | 22 HRC | 2.2 % IACS |
AWDefault As-welded deposit | Default condition for virtually all duplex fabrication: weld and leave as-welded, controlling heat input and interpass temperature to keep ferrite 35–65 %. | 640 | 830 | 27 | 25 HRC | — |
As-welded, MIG spray/pulse with Ar+CO₂/He/N₂ mixes | Pick for productive fill/cap passes on plate and pipe; keep CO₂ ≤2.5 % to limit carbon pickup. | 650 | 840 | 26 | 25 HRC | 2.2 % IACS |
Supply forms, finishes and certifications
Ways ER2209 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
CD-WIRE | Cold-drawn filler wire as supplied | Supply form |
What is ER2209?
ER2209 (S39209, EN 22 9 3 N L) is a nitrogen-bearing duplex stainless bare filler wire matched to 2205 base metal, depositing a balanced ferrite/austenite weld structure. It is used as GTAW, GMAW and SAW wire on duplex piping, vessels and offshore equipment, with as-welded deposits near 640 MPa yield, 830 MPa tensile, 27% elongation and 255 HB (25 HRC). Service is held to about 250 °C to avoid 475 °C embrittlement and sigma phase, and ferrite must be controlled during welding. For super duplex base metals use ER2553 or ER2594. ER2209 has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,385°C (2,525 °F). ER2209 has a yield strength of 640 MPa (92.8 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 90% of stainless steel grades. Elongation at break is 27% and the elastic modulus is 200 GPa (29 Msi).
What is ER2209 used for?
- 2205 duplex piping welds
- Duplex pressure vessel seams
- Offshore topside piping
- Desalination plant pipework
- Seawater heat exchanger tube-to-tubesheet welds
- Chemical tanker cargo tank welds
- Duplex storage tank fabrication
- Corrosion-resistant overlay on carbon steel
Advantages
- High strength — 640 MPa (92.8 ksi), better than 90% of stainless steel grades
- Good corrosion resistance — 80/100, better than 88% of stainless steel grades
- Readily welded — 85/100, better than 87% of stainless steel grades
Limitations
- Limited service temperature — 250°C (482 °F), worse than 99% of stainless steel grades
ER2209 properties
Typical room-temperature values for ER2209-AW; bars are the position among stainless steel grades.
Physical3
ER2209 has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,385°C (2,525 °F).
Mechanical16
ER2209 has a yield strength of 640 MPa (92.8 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 90% of stainless steel grades. Elongation at break is 27% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
ER2209 is rated for continuous service to 250°C (482 °F). It conducts heat at 15 W/m·K (8.67 BTU/hr·ft·°F), worse than 59% of stainless steel grades. Thermal expansion is 13 µm/m·K (7.22 µin/in·°F).
Electrical3
ER2209 conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (80/100), better than 88% of stainless steel grades.
Sustainability4
Producing a kilogram of ER2209 takes about 65 MJ of energy and emits 4.8 kg of CO₂ — more than 79% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
ER2209's machinability is poor (28/100, worse than 79% of stainless steel grades); weldability excellent (85/100); formability fair (45/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. ER2209 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with ER2209
Is ER2209 easy to machine?
Machine deposits like 2205: rigid setups, positive-rake carbide, low speed / high feed and flood coolant to beat rapid work hardening.
Can ER2209 be welded?
Weld with 0.5–2.5 kJ/mm heat input, interpass ≤150 °C, Ar (+1–3 % N₂) shielding and nitrogen backing; no preheat and normally no PWHT, target 35–65 % ferrite.
Can ER2209 be formed, bent or molded?
Supplied as cold-drawn wire; the weldment itself cold-forms with high forces and springback and should be solution annealed if heavily strained.
ER2209 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Clow carbon for corrosion resistance | ≤ 0.03 | 0.02 |
| Cr | 21.5 – 23.5 | 22.5 |
| Niover-alloyed vs 2205 base metal to promote weld austenite | 7.5 – 9.5 | 8.7 |
| Mo | 2.5 – 3.5 | 3 |
| Mn | 0.5 – 2 | 1.5 |
| Si | ≤ 0.9 | 0.5 |
| N | 0.08 – 0.2 | 0.15 |
| Cu | ≤ 0.75 | 0.1 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Fe | balance |
What surface finishes work on ER2209?
Pickle (HNO₃-HF paste) or bead-blast plus passivation to remove heat tint — untreated tint is the main pitting initiation site; do not anodize.
Surface treatments FabDigit runs on stainless steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Passivation
Organic Coating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel ER2209 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- S39209
- EN / DIN / Werkstoff-Nr.
- 22 9 3 N L
How much does ER2209 cost?
ER2209 is a high-cost stainless steel ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
ER2209 — frequently asked
What is ER2209 used for?
ER2209 is typically used for 2205 duplex piping welds, duplex pressure vessel seams, offshore topside piping, desalination plant pipework, seawater heat exchanger tube-to-tubesheet welds and chemical tanker cargo tank welds. In short: standard 2205 duplex filler; balanced ferrite-austenite deposit; stronger than 316L filler.
What is the yield strength of ER2209?
ER2209 has a typical yield strength of 640 MPa (92.8 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 90% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is ER2209 easy to machine?
Not especially — machinability is rated poor (28/100, worse than 79% of stainless steel grades). Machine deposits like 2205: rigid setups, positive-rake carbide, low speed / high feed and flood coolant to beat rapid work hardening.
Can ER2209 be welded?
Yes — weldability is rated excellent (85/100). Weld with 0.5–2.5 kJ/mm heat input, interpass ≤150 °C, Ar (+1–3 % N₂) shielding and nitrogen backing; no preheat and normally no PWHT, target 35–65 % ferrite.
What surface finishes work on ER2209?
Pickle (HNO₃-HF paste) or bead-blast plus passivation to remove heat tint — untreated tint is the main pitting initiation site; do not anodize.
Can ER2209 be formed, bent or molded?
Supplied as cold-drawn wire; the weldment itself cold-forms with high forces and springback and should be solution annealed if heavily strained.
What is the maximum service temperature of ER2209?
ER2209 is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ER2209-AW and ER2209-SA?
AW is the default condition — default condition for virtually all duplex fabrication: weld and leave as-welded, controlling heat input and interpass temperature to keep ferrite 35–65 %. SA: select when the weldment (e.g. cast or overlay component) is re-solution annealed, restoring phase balance and dissolving nitrides/sigma at the cost of strength. Yield strength is 640 MPa in AW versus 510 MPa in SA.
How much does ER2209 cost?
ER2209 is a high-cost stainless steel ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- AWS A5.9/A5.9M Bare Stainless Steel Welding Electrodes and Rods (ER2209, UNS S39209) — AWS (2017)
- ISO 14343 / EN 14343-A: W 22 9 3 N L — ISO (2017)
- Duplex 2209 filler metal all-weld-metal data (ESAB / Böhler / Sandvik 22.9.3.L) — ESAB, voestalpine Böhler Welding, Sandvik (2023)
- Outokumpu 2205 (S32205) duplex stainless physical property data — Outokumpu (2022)
- Practical Guidelines for the Fabrication of Duplex Stainless Steels — IMOA (2014)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.