Stainless Steel ER307 AW-GTAW
Finish state
UNS S30780 · EN 18 8 Mn
AW-GTAW = tIG deposit, as welded
Pick for thin sheet, root passes and precision repair: the as-welded TIG deposit has low oxygen content, giving slightly higher toughness and 40% elongation.
Values for the AW-GTAW condition
Other ER307 tempers and conditions
ER307 is listed in 5 conditions; see the grade overview at ER307.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Submerged-arc deposit with neutral flux, as welded | Choose for heavy-wall joints and large-area overlay where submerged-arc deposition rate rules; the high heat input coarsens grain and trims strength to 600 MPa. | 380 | 600 | 35 | 185 HB | 2.2 % IACS |
AW-GTAWThis page TIG deposit, as welded | Pick for thin sheet, root passes and precision repair: the as-welded TIG deposit has low oxygen content, giving slightly higher toughness and 40% elongation. | 390 | 610 | 40 | 185 HB | 2.2 % IACS |
AWDefault As-welded deposit | Standard choice: gas-shielded all-weld metal evaluated as welded, for joints in dissimilar and hard-to-weld steels, with service to 850 °C and 38% elongation. | 400 | 620 | 38 | 190 HB | 2.2 % IACS |
MIG/MAG spool deposit, as welded | Use spooled wire under Ar+2%O₂ or Ar+CO₂ for efficient fill on medium and thick plate and for buffer layers under hardfacing, as welded at 630 MPa tensile. | 410 | 630 | 36 | 195 HB | 2.2 % IACS |
Work-hardened weld surface | Expect this state on wear overlays and manganese-steel repairs where peening or service impact work-hardens the bead above 300 HB, at the cost of ductility and machinability. | 600 | 800 | 15 | 34 HRC | 2.1 % IACS |
What is ER307 AW-GTAW?
ER307 AW-GTAW is ER307 supplied in the AW-GTAW condition — pick for thin sheet, root passes and precision repair: the as-welded TIG deposit has low oxygen content, giving slightly higher toughness and 40% elongation. ER307 AW-GTAW has a yield strength of 390 MPa (56.6 ksi) and a tensile strength of 610 MPa (88.5 ksi) — stronger than 54% of stainless steel grades. Elongation at break is 40% and the elastic modulus is 196 GPa (28.4 Msi). ER307 AW-GTAW 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). AW is the default condition FabDigit quotes; AW-GTAW is available on request or by drawing note.
Advantages
- Readily welded — 92/100, better than 98% of stainless steel grades
- High service temperature — 850°C (1,562 °F), better than 80% of stainless steel grades
Limitations
- Hard to polish — 60/100, worse than 80% of stainless steel grades
ER307 AW-GTAW properties
Typical room-temperature values for ER307 AW-GTAW; 22 are specific to this condition. Other listed values are ER307 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
ER307 AW-GTAW 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
ER307 AW-GTAW has a yield strength of 390 MPa (56.6 ksi) and a tensile strength of 610 MPa (88.5 ksi) — stronger than 54% of stainless steel grades. Elongation at break is 40% and the elastic modulus is 196 GPa (28.4 Msi).
Thermal6
ER307 AW-GTAW is rated for continuous service to 850°C (1,562 °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 17.5 µm/m·K (9.72 µin/in·°F).
Electrical3
ER307 AW-GTAW conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), worse than 62% of stainless steel grades.
Sustainability4
Producing a kilogram of ER307 AW-GTAW takes about 56 MJ of energy and emits 4.6 kg of CO₂ — more than 59% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
ER307 AW-GTAW's machinability is poor (32/100, worse than 62% of stainless steel grades); weldability excellent (92/100); formability good (65/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ER307 AW-GTAW
Is ER307 easy to machine?
The deposit work-hardens severely and rates only 30 on machinability; use keen-edged carbide with positive rake, low surface speed with heavy feed, a rigid setup and flood coolant. Avoid dwelling or rubbing cuts that glaze the surface.
Can ER307 be welded?
GTAW, GMAW and submerged arc all apply, with pure Ar or Ar+2%O₂ / Ar+CO₂ shielding; keep interpass temperature ≤150 °C and do not normally preheat. In dissimilar-steel work the deposit serves as a buffer or transition layer.
Can ER307 be formed, bent or molded?
Not a formed product; as a filler metal it is not bent or drawn by the user. As-welded beads are ductile (38% elongation) but strength climbs quickly after cold work.
What surface finishes work on ER307?
Grind the weld, then pickle and passivate or electropolish to restore a corrosion-resistant surface. Anodising does not apply to stainless deposits.
ER307 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 ER307 | 0.04 – 0.14 | 0.09 |
| Cr | 19.5 – 22 | 20.5 |
| Ni | 8 – 10.7 | 9.3 |
| MnEN ISO 14343 Z 18 8 Mn type reaches 6-8% Mn | 3.3 – 4.75 | 4 |
| Mo | 0.5 – 1.5 | 1 |
| Si | 0.3 – 0.65 | 0.45 |
| P | ≤ 0.03 | — |
| S | ≤ 0.03 | — |
| Cu | ≤ 0.75 | — |
| Fe | balance | — |
ER307 AW-GTAW — frequently asked
What is ER307 AW-GTAW used for?
ER307 AW-GTAW is typically used for dissimilar metal welding, manganese steel joints and crack-resistant repair welds. In short: dissimilar-steel joining filler; manganese-alloyed crack resistance; 850 °C service rating.
What is the yield strength of ER307 AW-GTAW?
ER307 AW-GTAW has a typical yield strength of 390 MPa (56.6 ksi) and a tensile strength of 610 MPa (88.5 ksi) — stronger than 54% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is ER307 AW-GTAW easy to machine?
Not especially — machinability is rated poor (32/100, worse than 62% of stainless steel grades). The deposit work-hardens severely and rates only 30 on machinability; use keen-edged carbide with positive rake, low surface speed with heavy feed, a rigid setup and flood coolant. Avoid dwelling or rubbing cuts that glaze the surface.
Can ER307 AW-GTAW be welded?
Yes — weldability is rated excellent (92/100). GTAW, GMAW and submerged arc all apply, with pure Ar or Ar+2%O₂ / Ar+CO₂ shielding; keep interpass temperature ≤150 °C and do not normally preheat. In dissimilar-steel work the deposit serves as a buffer or transition layer.
What surface finishes work on ER307 AW-GTAW?
Grind the weld, then pickle and passivate or electropolish to restore a corrosion-resistant surface. Anodising does not apply to stainless deposits.
Can ER307 AW-GTAW be formed, bent or molded?
Not a formed product; as a filler metal it is not bent or drawn by the user. As-welded beads are ductile (38% elongation) but strength climbs quickly after cold work.
What is the maximum service temperature of ER307 AW-GTAW?
ER307 AW-GTAW is rated for continuous use to about 850°C (1,562 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ER307-AW and ER307 AW-CW?
AW is the default condition — standard choice: gas-shielded all-weld metal evaluated as welded, for joints in dissimilar and hard-to-weld steels, with service to 850 °C and 38% elongation. AW-CW: expect this state on wear overlays and manganese-steel repairs where peening or service impact work-hardens the bead above 300 HB, at the cost of ductility and machinability. Yield strength is 400 MPa in AW versus 600 MPa in AW-CW.
Sources
- AWS A5.9/A5.9M Bare Stainless Steel Welding Electrodes and Rods — AWS (2017)
- EN ISO 14343 Welding consumables — Wire electrodes for arc welding of stainless and heat-resisting steels — ISO (2017)
- ASM Handbook Vol.6 Welding, Brazing and Soldering — ASM International (1993)
- ASM Handbook Vol.1 Properties and Selection: Irons, Steels — ASM International (1990)
- Stainless filler metal 307 / 18 8 Mn (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.