Stainless Steel E2209
UNS W39209 · ASTM A5.4
E2209 is a duplex austenitic-ferritic covered electrode (UNS W39209, AWS A5.4, supplied as E2209-15, -16 and -17) matching 2205 duplex stainless chemistry.
Reference datasheet — E2209 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
E2209 tempers and conditions
E2209 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 | Used when the whole fabrication is re-solution annealed (e.g. after cold forming or to dissolve σ/nitrides), giving lower strength but the highest ductility and toughness. | 520 | 740 | 32 | 20 HRC | 2.3 % IACS |
Rutile-silica (acid-rutile) coating, AC or DCEP | Choose for the best bead appearance and highest deposition rate in flat/horizontal fillet welding on thinner duplex sections. | 615 | 810 | 25 | 26 HRC | 2.2 % IACS |
AWDefault As-welded deposit | Standard supply/use condition: duplex weld metal used directly after welding with controlled heat input and interpass temperature. | 620 | 810 | 26 | 25 HRC | 2.2 % IACS |
Lime (basic) coating, DCEP, all positions | Pick for maximum weld-metal toughness and lowest hydrogen/impurities on thick sections and restrained joints. | 620 | 800 | 28 | 24 HRC | 2.2 % IACS |
Lime-titania (rutile-basic) coating, AC or DCEP | Most widely stocked electrode type: good all-position operability with smooth beads and easy slag release; the usual Chinese-market 2205 electrode. | 620 | 810 | 26 | 25 HRC | 2.2 % IACS |
What is E2209?
E2209 is a duplex austenitic-ferritic covered electrode (UNS W39209, AWS A5.4, supplied as E2209-15, -16 and -17) matching 2205 duplex stainless chemistry. It is selected for high strength and chloride pitting resistance, with as-welded deposit near 620 MPa yield, 810 MPa tensile, 26 % elongation and 255 HB (25 HRC). Service is limited to 280 C because of 475 C embrittlement and sigma-phase risk, and heat input must be controlled to keep the ferrite/austenite balance. Where only general corrosion resistance is needed, E316L is the cheaper austenitic alternative. E2209 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). E2209 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 810 MPa (117 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 26% and the elastic modulus is 200 GPa (29 Msi).
What is E2209 used for?
- duplex 2205 pressure vessels
- offshore and marine structures
- desalination equipment
Advantages
- High strength — 620 MPa (89.9 ksi), better than 88% of stainless steel grades
- Readily welded — 85/100, better than 87% of stainless steel grades
Limitations
- Limited service temperature — 280°C (536 °F), worse than 96% of stainless steel grades
- Hard to polish — 60/100, worse than 80% of stainless steel grades
- Low fracture toughness — 90 MPa·√m (81.9 ksi·√in), worse than 75% of stainless steel grades
E2209 properties
Typical room-temperature values for E2209-AW; bars are the position among stainless steel grades.
Physical3
E2209 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).
Mechanical17
E2209 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 810 MPa (117 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 26% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
E2209 is rated for continuous service to 280°C (536 °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
E2209 conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), better than 73% of stainless steel grades.
Sustainability4
Producing a kilogram of E2209 takes about 62 MJ of energy and emits 4.6 kg of CO₂ — more than 75% of stainless steel grades. Typical recycled content is 55%.
Manufacturability6
E2209's machinability is poor (30/100, worse than 70% of stainless steel grades); weldability excellent (85/100); formability fair (35/100).
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. E2209 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with E2209
Is E2209 easy to machine?
Weld metal machines like 2205 duplex — rigid setup, sharp carbide, low speed / heavy positive feed to cut under the work-hardened layer; expect ~25 % of 1212 rating.
Can E2209 be welded?
SMAW electrode for 2205/2304/S31803/S32205 and duplex-to-austenitic or duplex-to-carbon-steel joints; redry per maker (≈250–300 °C for -15/-16), keep interpass ≤150 °C, heat input ~0.5–2.5 kJ/mm, no preheat and normally no PWHT.
Can E2209 be formed, bent or molded?
Not applicable to the electrode itself; the deposited duplex weld metal cold-forms with high springback and roughly double the force of 304, so allow generous bend radii.
E2209 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 |
|---|---|---|
| CAWS A5.4 max | ≤ 0.04 | 0.03 |
| Cr | 21.5 – 23.5 | 22.5 |
| Niover-alloyed vs base metal to balance ferrite | 8.5 – 10.5 | 9.5 |
| Mo | 2.5 – 3.5 | 3 |
| N | 0.08 – 0.2 | 0.14 |
| Mn | 0.5 – 2 | 1 |
| Si | ≤ 1 | 0.6 |
| Cu | ≤ 0.75 | 0.1 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Fe | balance |
What surface finishes work on E2209?
Pickle/passivate (nitric or citric acid paste) after removing slag and heat tint; mechanical brushing must use stainless-only wire wheels to avoid iron contamination.
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 E2209 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- W39209
- ASTM
- A5.4
- Also called
- AWS A5.4 E22092205 fillerAWS A5.4 E2209-XX
How much does E2209 cost?
E2209 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.
E2209 — frequently asked
What is E2209 used for?
E2209 is typically used for duplex 2205 pressure vessels, offshore and marine structures and desalination equipment. In short: highest-strength stainless filler; chloride pitting resistance; matches 2205 duplex.
What is the yield strength of E2209?
E2209 has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 810 MPa (117 ksi) — stronger than 88% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is E2209 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 70% of stainless steel grades). Weld metal machines like 2205 duplex — rigid setup, sharp carbide, low speed / heavy positive feed to cut under the work-hardened layer; expect ~25 % of 1212 rating.
Can E2209 be welded?
Yes — weldability is rated excellent (85/100). SMAW electrode for 2205/2304/S31803/S32205 and duplex-to-austenitic or duplex-to-carbon-steel joints; redry per maker (≈250–300 °C for -15/-16), keep interpass ≤150 °C, heat input ~0.5–2.5 kJ/mm, no preheat and normally no PWHT.
What surface finishes work on E2209?
Pickle/passivate (nitric or citric acid paste) after removing slag and heat tint; mechanical brushing must use stainless-only wire wheels to avoid iron contamination.
Can E2209 be formed, bent or molded?
Not applicable to the electrode itself; the deposited duplex weld metal cold-forms with high springback and roughly double the force of 304, so allow generous bend radii.
What is the maximum service temperature of E2209?
E2209 is rated for continuous use to about 280°C (536 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between E2209-AW and E2209-SA?
AW is the default condition — standard supply/use condition: duplex weld metal used directly after welding with controlled heat input and interpass temperature. SA: used when the whole fabrication is re-solution annealed (e.g. after cold forming or to dissolve σ/nitrides), giving lower strength but the highest ductility and toughness. Yield strength is 620 MPa in AW versus 520 MPa in SA.
How much does E2209 cost?
E2209 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 A5.4/A5.4M — Stainless Steel Electrodes for Shielded Metal Arc Welding — AWS (2012)
- Duplex 2205 / E2209 covered electrode all-weld-metal data — ESAB / Böhler Welding / voestalpine (2023)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- Duplex 2205 (EN 1.4462) physical and corrosion data — Outokumpu (2022)
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.