Stainless Steel ER330-AW (As-welded deposit)
Heat-treated state · default condition
UNS N08331
Default condition: undiluted deposit properties as used for design of 330-type heat-resistant weldments.
Values for the AW condition
Other ER330 tempers and conditions
ER330 is listed in 5 conditions; see the grade overview at ER330.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Weld metal solution annealed ~1090 °C, rapid cooled | Use when the fabricated assembly is solution annealed with the base alloy to dissolve carbides and restore ductility. | 265 | 550 | 42 | 160 HB | 1.7 % IACS |
As welded, GMAW/MIG spool deposit | Pick for higher deposition rate fill passes on heavier 330-type sections; slightly lower ductility than TIG. | 375 | 560 | 29 | 195 HB | 1.7 % IACS |
AWDefaultThis page As-welded deposit | Default condition: undiluted deposit properties as used for design of 330-type heat-resistant weldments. | 380 | 570 | 31 | 190 HB | 1.7 % IACS |
As welded, GTAW/TIG deposit | Pick for thin-section, high-purity root and repair welds where the cleanest, most ductile deposit is wanted. | 390 | 590 | 33 | 190 HB | 1.7 % IACS |
Cold drawn | Property set of the filler wire itself as delivered — relevant to feedability, stiffness of TIG rods and spool handling, not to weld design. | 620 | 800 | 12 | 25 HRC | 1.7 % IACS |
What is ER330-AW?
ER330-AW is ER330 heat treated to AW — default condition: undiluted deposit properties as used for design of 330-type heat-resistant weldments. ER330-AW has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 570 MPa (82.7 ksi) — stronger than 52% of stainless steel grades. Elongation at break is 31% and the elastic modulus is 196 GPa (28.4 Msi). ER330-AW has a density of 7.94 g/cm³ (0.287 lb/in³), heavier than 78% of stainless steel grades. It melts at 1,350°C (2,462 °F).
Advantages
- High service temperature — 1,100°C (2,012 °F), better than 96% of stainless steel grades
Limitations
- Low electrical conductivity — 1.7 % IACS, worse than 93% of stainless steel grades
- High embodied carbon — 6.5 kg CO₂/kg, worse than 93% of stainless steel grades
- Poor heat conductor — 12.5 W/m·K (7.22 BTU/hr·ft·°F), worse than 90% of stainless steel grades
- Difficult to machine — 25/100, worse than 88% of stainless steel grades
- Hard to polish — 60/100, worse than 80% of stainless steel grades
ER330-AW properties
Typical room-temperature values for ER330-AW; 22 are specific to this condition. Other listed values are ER330 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
ER330-AW has a density of 7.94 g/cm³ (0.287 lb/in³), heavier than 78% of stainless steel grades. It melts at 1,350°C (2,462 °F).
Mechanical15
ER330-AW has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 570 MPa (82.7 ksi) — stronger than 52% of stainless steel grades. Elongation at break is 31% and the elastic modulus is 196 GPa (28.4 Msi).
Thermal6
ER330-AW is rated for continuous service to 1,100°C (2,012 °F). It conducts heat at 12.5 W/m·K (7.22 BTU/hr·ft·°F), worse than 90% of stainless steel grades. Thermal expansion is 14.6 µm/m·K (8.11 µin/in·°F).
Electrical3
ER330-AW conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), worse than 62% of stainless steel grades.
Sustainability4
Producing a kilogram of ER330-AW takes about 90 MJ of energy and emits 6.5 kg of CO₂ — more than 94% of stainless steel grades. Typical recycled content is 40%.
Manufacturability7
ER330-AW's machinability is poor (25/100, worse than 88% of stainless steel grades); weldability good (60/100); 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 ER330-AW
Is ER330 easy to machine?
Rarely machined as wire; deposits are gummy, work-hardening and abrasive — use rigid setups, sharp carbide, heavy positive rake, low speed and flood coolant.
Can ER330 be welded?
Weld with low heat input, stringer beads, interpass temperature below ~150 °C and tight joint cleanliness; the fully austenitic deposit is hot-crack sensitive, so avoid restraint, sulphur/phosphorus pickup and excessive dilution from mild steel.
Can ER330 be formed, bent or molded?
Supplied as cold-drawn wire; the deposit itself work-hardens rapidly, so cold straightening or peening of welds should be limited and followed by a solution anneal if heavy.
What surface finishes work on ER330?
Grind and pickle/passivate welds to remove heat tint and embedded iron; not anodisable, and electropolishing gives the best high-temperature oxidation performance.
ER330 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 |
|---|---|---|
| Chigh C intentional for creep/carburisation resistance | 0.18 – 0.25 | 0.21 |
| Cr | 15 – 17 | 16 |
| Ni | 34 – 37 | 35.5 |
| Mn | 1 – 2.5 | 1.7 |
| Si | 0.3 – 0.65 | 0.5 |
| Moresidual limit | ≤ 0.75 | — |
| Curesidual limit | ≤ 0.75 | — |
| P | ≤ 0.03 | — |
| S | ≤ 0.03 | — |
| Febalance, ~44 % | balance | — |
ER330-AW — frequently asked
What is ER330-AW used for?
ER330-AW is typically used for furnace components, heat-treating baskets and fixtures, radiant tubes and retorts, burner nozzles and muffles, kiln and furnace roll repair and annealing box and tray fabrication. In short: highest service temperature filler; furnace-grade high-Ni wire; fully austenitic deposit.
What is the yield strength of ER330-AW?
ER330-AW has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 570 MPa (82.7 ksi) — stronger than 52% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is ER330-AW easy to machine?
Not especially — machinability is rated poor (25/100, worse than 88% of stainless steel grades). Rarely machined as wire; deposits are gummy, work-hardening and abrasive — use rigid setups, sharp carbide, heavy positive rake, low speed and flood coolant.
Can ER330-AW be welded?
Yes — weldability is rated good (60/100). Weld with low heat input, stringer beads, interpass temperature below ~150 °C and tight joint cleanliness; the fully austenitic deposit is hot-crack sensitive, so avoid restraint, sulphur/phosphorus pickup and excessive dilution from mild steel.
What surface finishes work on ER330-AW?
Grind and pickle/passivate welds to remove heat tint and embedded iron; not anodisable, and electropolishing gives the best high-temperature oxidation performance.
Can ER330-AW be formed, bent or molded?
Supplied as cold-drawn wire; the deposit itself work-hardens rapidly, so cold straightening or peening of welds should be limited and followed by a solution anneal if heavy.
What is the maximum service temperature of ER330-AW?
ER330-AW is rated for continuous use to about 1,100°C (2,012 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ER330-AW and ER330-CD?
AW is the default condition — default condition: undiluted deposit properties as used for design of 330-type heat-resistant weldments. CD: property set of the filler wire itself as delivered — relevant to feedability, stiffness of TIG rods and spool handling, not to weld design. Yield strength is 380 MPa in AW versus 620 MPa in CD.
Sources
- AWS A5.9/A5.9M — Bare Stainless Steel Welding Electrodes and Rods (ER330, UNS W88331) — AWS (2017)
- ASME BPVC Section II Part C, SFA-5.9 — ASME (2023)
- ASM Handbook Vol.6 Welding, Brazing and Soldering; Vol.1 Properties of Irons and Steels — ASM International (1993)
- Alloy 330 / RA330 heat-resistant alloy physical property datasheet — Rolled Alloys (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.