Stainless Steel ER349
UNS S34980
ER349 is a tantalum/niobium-stabilized austenitic stainless bare wire (UNS S34980) with higher alloy content than the 347 group, giving added strength and creep resistance at temperature.
Reference datasheet — ER349 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 AS-WELDED condition
ER349 tempers and conditions
ER349 is supplied in 3 conditions, soft to hard. AS-WELDED is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution Annealed weld metal | Use when the whole fabrication is solution treated after welding to homogenize the deposit and maximize ductility/corrosion resistance. | 380 | 660 | 40 | 185 HB | 2.2 % IACS |
As Welded + Stress Relieved | Pick when residual stress or distortion must be reduced on stabilized 349-type assemblies while keeping most of the as-welded strength. | 470 | 720 | 33 | 215 HB | 2.2 % IACS |
AS-WELDEDDefault undiluted all-weld-metal deposit (GTAW/GMAW) | Default condition: properties of the undiluted deposit as laid down by TIG/MIG without any post-weld heat treatment. | 520 | 760 | 30 | 230 HB | — |
Supply forms, finishes and certifications
Ways ER349 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
WIRE-CD | Cold Drawn Wire / Spool or Cut-Length filler | Supply form |
What is ER349?
ER349 is a tantalum/niobium-stabilized austenitic stainless bare wire (UNS S34980) with higher alloy content than the 347 group, giving added strength and creep resistance at temperature. Engineers specify it for stabilized stainless joints that must carry load hot, and it is supplied as cold-drawn wire for GTAW, GMAW and SAW. Typical deposits reach about 520 MPa yield, 760 MPa tensile, 30% elongation and 230 HB, with service to 815 °C. Machinability is low (score 30) and the deposit work-hardens quickly; where the extra strength is not needed, ER347 or ER347Si is the cheaper, easier alternative. ER349 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). ER349 has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 79% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 197 GPa (28.6 Msi).
What is ER349 used for?
- High-temperature stabilized stainless welds
- Turbine and jet engine component repair
- Hot-section ducting and manifold joints
- Furnace fixtures and heat-treat baskets
- Stabilized stainless pressure parts operating above 550 °C
- Overlay on 349-type and stabilized austenitic base metal
Advantages
- High strength — 520 MPa (75.4 ksi), better than 79% of stainless steel grades
- High service temperature — 815°C (1,499 °F), better than 77% of stainless steel grades
ER349 properties
Typical room-temperature values for ER349-AS-WELDED; bars are the position among stainless steel grades.
Physical3
ER349 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).
Mechanical14
ER349 has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 79% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 197 GPa (28.6 Msi).
Thermal6
ER349 is rated for continuous service to 815°C (1,499 °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 16.2 µm/m·K (9 µin/in·°F).
Electrical3
ER349 conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 52% of stainless steel grades.
Sustainability4
Producing a kilogram of ER349 takes about 65 MJ of energy and emits 4.5 kg of CO₂ — more than 79% of stainless steel grades. Typical recycled content is 40%.
Manufacturability7
ER349's machinability is poor (30/100, worse than 70% of stainless steel grades); weldability very good (70/100); formability good (55/100).
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. ER349 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with ER349
Is ER349 easy to machine?
Machine the deposit like a high-strength austenitic stainless: rigid setup, sharp carbide, positive rake, heavy feed and flood coolant to avoid work hardening and glazing.
Can ER349 be welded?
Use for GTAW/GMAW/SAW on 349-type and stabilized austenitic stainless; keep interpass temperature low, moderate heat input and 4–10 FN ferrite to limit hot cracking, and use pure Ar (TIG) or Ar+1–2% O₂/CO₂ (MIG) with good back-purging.
Can ER349 be formed, bent or molded?
Supplied as cold-drawn wire; the weld deposit itself is strong and work-hardens rapidly, so limit cold straightening or bending of welded joints and anneal if heavy forming follows.
ER349 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 |
|---|---|---|
| C | 0.07 – 0.13 | 0.1 |
| Cr | 19 – 21.5 | 20 |
| Ni | 8 – 9.5 | 8.8 |
| Mo | 0.35 – 0.65 | 0.5 |
| W | 1.25 – 1.75 | 1.5 |
| Nb+Tacolumbium plus tantalum, stabilizer | 1 – 1.4 | 1.2 |
| Ti | 0.1 – 0.3 | 0.2 |
| Mn | 1 – 2.5 | 1.6 |
| Si | ≤ 0.65 | 0.4 |
| Cu | ≤ 0.75 | 0.15 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Fe | balance |
What surface finishes work on ER349?
Pickle and passivate or mechanically blend weld beads; do not anodize — electropolishing or glass-bead/abrasive blending plus passivation restores the chromium oxide film.
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 ER349 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- S34980
How much does ER349 cost?
ER349 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.
ER349 — frequently asked
What is ER349 used for?
ER349 is typically used for high-temperature stabilized stainless welds, turbine and jet engine component repair, hot-section ducting and manifold joints, furnace fixtures and heat-treat baskets, stabilized stainless pressure parts operating above 550 °C and overlay on 349-type and stabilized austenitic base metal. In short: strongest stabilized austenitic filler; creep resistance to 815 °C; ta/Nb dual stabilization.
What is the yield strength of ER349?
ER349 has a typical yield strength of 520 MPa (75.4 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 79% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is ER349 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 70% of stainless steel grades). Machine the deposit like a high-strength austenitic stainless: rigid setup, sharp carbide, positive rake, heavy feed and flood coolant to avoid work hardening and glazing.
Can ER349 be welded?
Yes — weldability is rated very good (70/100). Use for GTAW/GMAW/SAW on 349-type and stabilized austenitic stainless; keep interpass temperature low, moderate heat input and 4–10 FN ferrite to limit hot cracking, and use pure Ar (TIG) or Ar+1–2% O₂/CO₂ (MIG) with good back-purging.
What surface finishes work on ER349?
Pickle and passivate or mechanically blend weld beads; do not anodize — electropolishing or glass-bead/abrasive blending plus passivation restores the chromium oxide film.
Can ER349 be formed, bent or molded?
Supplied as cold-drawn wire; the weld deposit itself is strong and work-hardens rapidly, so limit cold straightening or bending of welded joints and anneal if heavy forming follows.
What is the maximum service temperature of ER349?
ER349 is rated for continuous use to about 815°C (1,499 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ER349 AS-WELDED and ER349 SOL-ANN?
AS-WELDED is the default condition — default condition: properties of the undiluted deposit as laid down by TIG/MIG without any post-weld heat treatment. SOL-ANN: use when the whole fabrication is solution treated after welding to homogenize the deposit and maximize ductility/corrosion resistance. Yield strength is 520 MPa in AS-WELDED versus 380 MPa in SOL-ANN.
How much does ER349 cost?
ER349 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 — American Welding Society (2017)
- ASTM A959 / UNS S34980 designation listing — ASTM / SAE-ASTM Unified Numbering System (2019)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.6 — Welding, Brazing, and Soldering — ASM International (1993)
- Stainless steel filler metal datasheets (349/347 stabilized types) — Various consumable producers (2023)
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.