Stainless Steel ER330-SA
Heat-treated state
UNS N08331
SA = 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.
Values for the SA 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 |
|---|---|---|---|---|---|---|
SAThis page 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 |
AWDefault 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-SA?
ER330-SA is ER330 heat treated to SA — use when the fabricated assembly is solution annealed with the base alloy to dissolve carbides and restore ductility. ER330-SA has a yield strength of 265 MPa (38.4 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 81% of stainless steel grades. Elongation at break is 42% and the elastic modulus is 196 GPa (28.4 Msi). ER330-SA 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). AW is the default condition FabDigit quotes; SA is available on request or by drawing note.
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 — 12.8 W/m·K (7.4 BTU/hr·ft·°F), worse than 86% of stainless steel grades
- Low strength — 265 MPa (38.4 ksi), worse than 81% of stainless steel grades
- Hard to polish — 60/100, worse than 80% of stainless steel grades
ER330-SA properties
Typical room-temperature values for ER330-SA; 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-SA 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-SA has a yield strength of 265 MPa (38.4 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 81% of stainless steel grades. Elongation at break is 42% and the elastic modulus is 196 GPa (28.4 Msi).
Thermal6
ER330-SA is rated for continuous service to 1,100°C (2,012 °F). It conducts heat at 12.8 W/m·K (7.4 BTU/hr·ft·°F), worse than 86% of stainless steel grades. Thermal expansion is 14.6 µm/m·K (8.11 µin/in·°F).
Electrical3
ER330-SA conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 52% of stainless steel grades.
Sustainability4
Producing a kilogram of ER330-SA 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-SA's machinability is poor (28/100, worse than 79% of stainless steel grades); weldability good (62/100); formability good (65/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ER330-SA
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-SA — frequently asked
What is ER330-SA used for?
ER330-SA 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-SA?
ER330-SA has a typical yield strength of 265 MPa (38.4 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 81% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is ER330-SA easy to machine?
Not especially — machinability is rated poor (28/100, worse than 79% 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-SA be welded?
Yes — weldability is rated good (62/100). 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-SA?
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-SA 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-SA?
ER330-SA 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.