Stainless Steel ER347-AW (As-welded deposit)
Heat-treated state · default condition
UNS S34780 · JIS Y347 · ISO 19 9 Nb
Default condition: all-weld-metal deposited by GTAW with argon shielding, no post-weld heat treatment.
Values for the AW condition
Other ER347 tempers and conditions
ER347 is listed in 4 conditions; see the grade overview at ER347.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
stabilization anneal 870–900 °C / air cool after welding | Choose when the joint will see prolonged 425–815 °C service or severe nitric-acid duty; ties residual carbon into NbC and relieves welding stress. | 350 | 580 | 42 | 150 HB | 2.4 % IACS |
As-welded weld metal | For high-deposition-rate multi-pass welds on heavy stainless plate; check flux for Nb recovery so stabilization ratio is maintained. | 395 | 590 | 34 | 172 HB | 2.4 % IACS |
As-welded weld metal | Pick for spray-transfer MIG deposition on thicker sections; slightly lower toughness than GTAW due to higher heat input and oxygen pick-up. | 405 | 610 | 35 | 180 HB | 2.4 % IACS |
AWDefaultThis page As-welded deposit | Default condition: all-weld-metal deposited by GTAW with argon shielding, no post-weld heat treatment. | 420 | 620 | 38 | 175 HB | 2.4 % IACS |
What is ER347-AW?
ER347-AW is ER347 heat treated to AW — default condition: all-weld-metal deposited by GTAW with argon shielding, no post-weld heat treatment. ER347-AW has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 64% of stainless steel grades. Elongation at break is 38% and the elastic modulus is 195 GPa (28.3 Msi). ER347-AW has a density of 7.95 g/cm³ (0.287 lb/in³), heavier than 81% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Advantages
- Readily welded — 88/100, better than 91% of stainless steel grades
- High service temperature — 815°C (1,499 °F), better than 77% of stainless steel grades
Limitations
- High embodied carbon — 5.5 kg CO₂/kg, worse than 77% of stainless steel grades
ER347-AW properties
Typical room-temperature values for ER347-AW; 23 are specific to this condition. Other listed values are ER347 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
ER347-AW has a density of 7.95 g/cm³ (0.287 lb/in³), heavier than 81% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical16
ER347-AW has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 64% of stainless steel grades. Elongation at break is 38% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
ER347-AW is rated for continuous service to 815°C (1,499 °F). It conducts heat at 16.1 W/m·K (9.3 BTU/hr·ft·°F), better than 61% of stainless steel grades. Thermal expansion is 16.6 µm/m·K (9.22 µin/in·°F).
Electrical3
ER347-AW conducts electricity at 2.4 % IACS, better than 67% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (66/100), better than 59% of stainless steel grades.
Sustainability4
Producing a kilogram of ER347-AW takes about 60 MJ of energy and emits 5.5 kg of CO₂ — more than 70% of stainless steel grades. Typical recycled content is 60%.
Manufacturability8
ER347-AW's machinability is fair (35/100, better than 51% of stainless steel grades); weldability excellent (88/100); formability fair (50/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ER347-AW
Is ER347 easy to machine?
Deposited weld metal machines like 347 bar — low speed, positive rake, rigid setup and heavy feed to cut under the work-hardened layer; expect ~45 % of AISI 1212 rates.
Can ER347 be welded?
Use DCEN for GTAW / DCEP for GMAW with Ar or Ar+He (add ≤2 % O₂ or CO₂ for spray MIG); keep interpass below ~150 °C, low heat input and stringer beads to limit hot cracking and Nb segregation; no preheat and normally no PWHT.
Can ER347 be formed, bent or molded?
Supplied as drawn wire — coil straightening and light bending only; the deposited austenitic metal is very ductile but work-hardens rapidly when cold formed.
What surface finishes work on ER347?
Pickle/passivate (ASTM A380/A967) or mechanically blend and electropolish the bead to restore the chromium oxide film; never anodize.
ER347 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 A5.9 max | ≤ 0.08 | 0.05 |
| Cr | 19 – 21.5 | 20 |
| Ni | 9 – 11 | 10 |
| Mn | 1 – 2.5 | 1.7 |
| Si | 0.3 – 0.65 | 0.45 |
| Nb+Ta10×C min, 1.00 max (Nb+Ta) | 0.5 – 1 | 0.7 |
| Moresidual | ≤ 0.75 | — |
| Curesidual | ≤ 0.75 | — |
| P | ≤ 0.03 | — |
| S | ≤ 0.03 | — |
| Fe | balance | — |
ER347-AW — frequently asked
What is ER347-AW used for?
ER347-AW is typically used for stabilized stainless piping, high-temperature pressure vessels and aerospace ducting. In short: nb-stabilized 347 filler; service to 815 C; cryogenic-qualified deposit.
What is the yield strength of ER347-AW?
ER347-AW has a typical yield strength of 420 MPa (60.9 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 64% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is ER347-AW easy to machine?
Not especially — machinability is rated fair (35/100, better than 51% of stainless steel grades). Deposited weld metal machines like 347 bar — low speed, positive rake, rigid setup and heavy feed to cut under the work-hardened layer; expect ~45 % of AISI 1212 rates.
Can ER347-AW be welded?
Yes — weldability is rated excellent (88/100). Use DCEN for GTAW / DCEP for GMAW with Ar or Ar+He (add ≤2 % O₂ or CO₂ for spray MIG); keep interpass below ~150 °C, low heat input and stringer beads to limit hot cracking and Nb segregation; no preheat and normally no PWHT.
What surface finishes work on ER347-AW?
Pickle/passivate (ASTM A380/A967) or mechanically blend and electropolish the bead to restore the chromium oxide film; never anodize.
Can ER347-AW be formed, bent or molded?
Supplied as drawn wire — coil straightening and light bending only; the deposited austenitic metal is very ductile but work-hardens rapidly when cold formed.
What is the maximum service temperature of ER347-AW?
ER347-AW 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 ER347-AW and ER347 AW-SAW?
AW is the default condition — default condition: all-weld-metal deposited by GTAW with argon shielding, no post-weld heat treatment. AW-SAW: for high-deposition-rate multi-pass welds on heavy stainless plate; check flux for Nb recovery so stabilization ratio is maintained. Yield strength is 420 MPa in AW versus 395 MPa in AW-SAW.
Sources
- AWS A5.9/A5.9M Bare Stainless Steel Welding Electrodes and Rods — American Welding Society (2017)
- ASME BPVC Section II Part C, SFA-5.9 — ASME (2023)
- EN ISO 14343 (19 9 Nb) — ISO (2017)
- ASM Specialty Handbook: Stainless Steels — ASM International (1994)
- ASM Handbook Vol.6: Welding, Brazing and Soldering — ASM International (1993)
- Stainless filler metal weld-metal typical property sheets (Böhler, ESAB, Lincoln) — various (2023)
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.