Stainless Steel E2209-SA (Solution Annealed)
Heat-treated state
UNS W39209 · ASTM A5.4
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.
Values for the SA condition
Other E2209 tempers and conditions
E2209 is listed in 5 conditions; see the grade overview at E2209.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SAThis page 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-SA?
E2209-SA is E2209 heat treated to 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. E2209-SA has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 740 MPa (107 ksi) — stronger than 79% of stainless steel grades. Elongation at break is 32% and the elastic modulus is 200 GPa (29 Msi). E2209-SA 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). AW is the default condition FabDigit quotes; SA is available on request or by drawing note.
Advantages
- Readily welded — 88/100, better than 91% of stainless steel grades
- High strength — 520 MPa (75.4 ksi), better than 79% of stainless steel grades
- Good corrosion resistance — 75/100, better than 79% 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
E2209-SA properties
Typical room-temperature values for E2209-SA; 23 are specific to this condition. Other listed values are E2209 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
E2209-SA 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-SA has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 740 MPa (107 ksi) — stronger than 79% of stainless steel grades. Elongation at break is 32% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
E2209-SA is rated for continuous service to 280°C (536 °F). It conducts heat at 16 W/m·K (9.24 BTU/hr·ft·°F), better than 58% of stainless steel grades. Thermal expansion is 13 µm/m·K (7.22 µin/in·°F).
Electrical3
E2209-SA conducts electricity at 2.3 % IACS, better than 55% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (75/100), better than 79% of stainless steel grades.
Sustainability4
Producing a kilogram of E2209-SA 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-SA's machinability is fair (35/100, better than 51% of stainless steel grades); weldability excellent (88/100); formability fair (48/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with E2209-SA
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.
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.
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 | — |
E2209-SA — frequently asked
What is E2209-SA used for?
E2209-SA 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-SA?
E2209-SA has a typical yield strength of 520 MPa (75.4 ksi) and a tensile strength of 740 MPa (107 ksi) — stronger than 79% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is E2209-SA easy to machine?
Not especially — machinability is rated fair (35/100, better than 51% 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-SA be welded?
Yes — weldability is rated excellent (88/100). 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-SA?
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-SA 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-SA?
E2209-SA 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.