Stainless Steel ER308-AW (As-welded deposit)
Heat-treated state · default condition
UNS S30880 · EN 19 9
Default condition: properties of the undiluted deposit as laid down by GTAW/GMAW with no post-weld heat treatment.
Values for the AW condition
Other ER308 tempers and conditions
ER308 is listed in 3 conditions; see the grade overview at ER308.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Weld deposit after post-weld solution anneal | Used when the weldment is fully solution annealed after fabrication to restore ductility, relieve residual stress and desensitize. | 300 | 560 | 48 | 160 HB | 2.4 % IACS |
AWDefaultThis page As-welded deposit | Default condition: properties of the undiluted deposit as laid down by GTAW/GMAW with no post-weld heat treatment. | 400 | 600 | 40 | 185 HB | 2.4 % IACS |
Cold drawn | Pick this for the mechanical properties of the wire itself (feedability, coil memory, spool stiffness), not of the deposit. | 700 | 900 | 12 | 30 HRC | 2.4 % IACS |
What is ER308-AW?
ER308-AW is ER308 heat treated to AW — default condition: properties of the undiluted deposit as laid down by GTAW/GMAW with no post-weld heat treatment. ER308-AW has a yield strength of 400 MPa (58 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 57% of stainless steel grades. Elongation at break is 40% and the elastic modulus is 195 GPa (28.3 Msi). ER308-AW has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Advantages
- Readily welded — 95/100, better than 99% of stainless steel grades
ER308-AW properties
Typical room-temperature values for ER308-AW; 23 are specific to this condition. Other listed values are ER308 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
ER308-AW has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical16
ER308-AW has a yield strength of 400 MPa (58 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 57% of stainless steel grades. Elongation at break is 40% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
ER308-AW is rated for continuous service to 760°C (1,400 °F). It conducts heat at 15.5 W/m·K (8.96 BTU/hr·ft·°F), better than 53% of stainless steel grades. Thermal expansion is 16.9 µm/m·K (9.39 µin/in·°F).
Electrical3
ER308-AW conducts electricity at 2.4 % IACS, better than 67% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 56% of stainless steel grades.
Sustainability4
Producing a kilogram of ER308-AW takes about 57 MJ of energy and emits 5 kg of CO₂ — more than 62% of stainless steel grades. Typical recycled content is 45%.
Manufacturability6
ER308-AW's machinability is fair (38/100, better than 63% of stainless steel grades); weldability excellent (95/100); formability good (55/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ER308-AW
Is ER308 easy to machine?
Weld metal machines like 304 — low speed, positive rake, rigid setup and flood coolant; it work-hardens and smears, so avoid dwelling and never let the tool rub.
Can ER308 be welded?
Run DCEN GTAW or spray/pulsed GMAW with Ar (+2–3 % CO2 or He for GMAW) shielding, keep interpass below ~150 °C and heat input modest to preserve 4–10 FN ferrite and avoid hot cracking.
Can ER308 be formed, bent or molded?
Supplied as drawn wire or straightened cut lengths; the deposit itself cold-forms and bends well but hardens rapidly, so allow generous bend radii and interstage annealing.
What surface finishes work on ER308?
Pickle and passivate or mechanically blend the weld to remove heat tint; brush/grind with dedicated stainless-only abrasives to avoid iron contamination and rust bleeding.
ER308 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 |
|---|---|---|
| CER308L limits C to 0.03 max | ≤ 0.08 | 0.05 |
| Cr | 19.5 – 22 | 20.5 |
| Ni | 9 – 11 | 10 |
| Mn | 1 – 2.5 | 1.8 |
| SiER308Si raises Si to 0.65–1.00 for better wetting | 0.3 – 0.65 | 0.45 |
| Moresidual only | ≤ 0.75 | 0.1 |
| Curesidual only | ≤ 0.75 | 0.15 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Febalance; total other elements 0.50 max | balance | — |
ER308-AW — frequently asked
What is ER308-AW used for?
ER308-AW is typically used for TIG/MIG welding of 304 stainless, food & dairy equipment and general austenitic fabrication. In short: standard 304 filler wire; 4–10 FN ferrite deposit; wire counterpart to E308.
What is the yield strength of ER308-AW?
ER308-AW has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 57% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is ER308-AW easy to machine?
Not especially — machinability is rated fair (38/100, better than 63% of stainless steel grades). Weld metal machines like 304 — low speed, positive rake, rigid setup and flood coolant; it work-hardens and smears, so avoid dwelling and never let the tool rub.
Can ER308-AW be welded?
Yes — weldability is rated excellent (95/100). Run DCEN GTAW or spray/pulsed GMAW with Ar (+2–3 % CO2 or He for GMAW) shielding, keep interpass below ~150 °C and heat input modest to preserve 4–10 FN ferrite and avoid hot cracking.
What surface finishes work on ER308-AW?
Pickle and passivate or mechanically blend the weld to remove heat tint; brush/grind with dedicated stainless-only abrasives to avoid iron contamination and rust bleeding.
Can ER308-AW be formed, bent or molded?
Supplied as drawn wire or straightened cut lengths; the deposit itself cold-forms and bends well but hardens rapidly, so allow generous bend radii and interstage annealing.
What is the maximum service temperature of ER308-AW?
ER308-AW is rated for continuous use to about 760°C (1,400 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ER308-AW and ER308-CD?
AW is the default condition — default condition: properties of the undiluted deposit as laid down by GTAW/GMAW with no post-weld heat treatment. CD: pick this for the mechanical properties of the wire itself (feedability, coil memory, spool stiffness), not of the deposit. Yield strength is 400 MPa in AW versus 700 MPa in CD.
Sources
- AWS A5.9/A5.9M — Bare Stainless Steel Welding Electrodes and Rods — AWS (2017)
- ASME BPVC Section II Part C, SFA-5.9 — ASME (2023)
- EN ISO 14343 — Welding consumables, wire and strip electrodes for stainless steels (19 9) — ISO (2017)
- ER308/308L solid wire and TIG rod datasheets — ESAB / Lincoln Electric / voestalpine Böhler Welding (2023)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering; Vol.1 — Properties of Steels — ASM International (1993)
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.