Stainless Steel 330 As Welded
Finish state
AISI/SAE 330 · UNS N08330 · ASTM A240 Type 330 · EN 1.4886 · also RA330
Property basis for weldments and weld overlays; matching high-carbon/columbium modified filler is used to avoid hot cracking and to keep creep strength.
Values for the As Welded condition
Other 330 tempers and conditions
330 is listed in 5 conditions; see the grade overview at 330.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
mill annealed (soft) sheet, strip and bar | General soft annealed stock for forming and deep-drawn furnace parts where maximum formability is wanted. | 250 | 565 | 45 | 145 HB | 1.7 % IACS |
Solution AnnealedDefault 1065–1150 °C solution anneal, rapid cool | Standard supply condition for sheet, plate, pipe and bar — maximum ductility and best high-temperature oxidation/carburisation performance. | 270 | 585 | 43 | 150 HB | — |
hot rolled/forged bar and plate, annealed after hot work | Economical heavy bar, forgings and thick plate for furnace fixtures and retorts where surface finish and tight tolerance are not critical. | 290 | 600 | 40 | 160 HB | 1.7 % IACS |
As WeldedThis page weld metal / weldment with matching RA330-04 type filler | Property basis for weldments and weld overlays; matching high-carbon/columbium modified filler is used to avoid hot cracking and to keep creep strength. | 330 | 560 | 28 | 175 HB | 1.7 % IACS |
cold drawn/cold finished bar and wire | Choose for higher room-temperature strength, straightness and good surface on small-diameter bar and wire; ductility and high-temperature stability are reduced (recrystallises in service). | 480 | 700 | 25 | 200 HB | — |
What is 330 As Welded?
330 As Welded is 330 supplied in the As Welded condition — property basis for weldments and weld overlays; matching high-carbon/columbium modified filler is used to avoid hot cracking and to keep creep strength. 330 As Welded has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 57% of stainless steel grades. Elongation at break is 28% and the elastic modulus is 196 GPa (28.4 Msi). 330 As Welded has a density of 7.94 g/cm³ (0.287 lb/in³), heavier than 78% of stainless steel grades. It melts at 1,370°C (2,498 °F). Solution Annealed is the default condition FabDigit quotes; As Welded 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
- High embodied carbon — 7.5 kg CO₂/kg, worse than 97% of stainless steel grades
- Low electrical conductivity — 1.7 % IACS, worse than 93% of stainless steel grades
- Poor heat conductor — 12.6 W/m·K (7.28 BTU/hr·ft·°F), worse than 88% of stainless steel grades
330 As Welded properties
Typical room-temperature values for 330 As Welded; 20 are specific to this condition. Other listed values are 330 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
330 As Welded has a density of 7.94 g/cm³ (0.287 lb/in³), heavier than 78% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Mechanical13
330 As Welded has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 57% of stainless steel grades. Elongation at break is 28% and the elastic modulus is 196 GPa (28.4 Msi).
Thermal6
330 As Welded is rated for continuous service to 1,100°C (2,012 °F). It conducts heat at 12.6 W/m·K (7.28 BTU/hr·ft·°F), worse than 88% of stainless steel grades. Thermal expansion is 14.4 µm/m·K (8 µin/in·°F).
Electrical3
330 As Welded 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 330 As Welded takes about 95 MJ of energy and emits 7.5 kg of CO₂ — more than 96% of stainless steel grades. Typical recycled content is 40%.
Manufacturability7
330 As Welded's machinability is poor (26/100, worse than 84% of stainless steel grades); weldability good (58/100); formability fair (40/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 330 As Welded
Is 330 easy to machine?
Machine like a nickel alloy: rigid setup, positive rake carbide, heavy depth of cut, low speed (≈15–25 m/min HSS, 40–70 m/min carbide), continuous feed and flood coolant to avoid work-hardened glaze.
Can 330 be welded?
GTAW/GMAW/SMAW with matching RA330-04 (or 330-type) filler; no preheat, keep interpass low, low heat input and clean joints to limit hot cracking; avoid autogenous welds on heavy sections.
Can 330 be formed, bent or molded?
Forms cold with good ductility but high work-hardening — allow extra press force, generous radii, and intermediate anneals at 1065–1150 °C for severe draws; hot works at 1100–1230 °C.
What surface finishes work on 330?
Pickle/passivate or grit blast plus pickling to remove the tenacious Si-rich oxide before service or brazing; takes a fair mechanical polish, not anodizable.
330 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 |
|---|---|---|
| Ni | 34 – 37 | 35.5 |
| Cr | 17 – 20 | 18.5 |
| Sihigh Si gives the oxidation/carburisation resistance | 0.75 – 1.5 | 1.15 |
| Mn | ≤ 2 | 1.5 |
| C | ≤ 0.08 | 0.05 |
| P | ≤ 0.03 | — |
| S | ≤ 0.03 | — |
| Pb | ≤ 0.01 | — |
| Sn | ≤ 0.03 | — |
| Cusome specifications only | ≤ 1 | — |
| Febalance, nominally ~43 % | balance | — |
330 As Welded — frequently asked
What is 330 As Welded used for?
330 As Welded is typically used for heat treating fixtures and trays, furnace muffles and retorts, radiant tubes, annealing covers, burner sleeves and cement kiln internals. In short: ultimate heat resistance.
What is the yield strength of 330 As Welded?
330 As Welded has a typical yield strength of 330 MPa (47.9 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 57% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is 330 As Welded easy to machine?
Not especially — machinability is rated poor (26/100, worse than 84% of stainless steel grades). Machine like a nickel alloy: rigid setup, positive rake carbide, heavy depth of cut, low speed (≈15–25 m/min HSS, 40–70 m/min carbide), continuous feed and flood coolant to avoid work-hardened glaze.
Can 330 As Welded be welded?
Yes — weldability is rated good (58/100). GTAW/GMAW/SMAW with matching RA330-04 (or 330-type) filler; no preheat, keep interpass low, low heat input and clean joints to limit hot cracking; avoid autogenous welds on heavy sections.
What surface finishes work on 330 As Welded?
Pickle/passivate or grit blast plus pickling to remove the tenacious Si-rich oxide before service or brazing; takes a fair mechanical polish, not anodizable.
Can 330 As Welded be formed, bent or molded?
Forms cold with good ductility but high work-hardening — allow extra press force, generous radii, and intermediate anneals at 1065–1150 °C for severe draws; hot works at 1100–1230 °C.
What is the maximum service temperature of 330 As Welded?
330 As Welded 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.
Can FabDigit make parts in 330 As Welded?
Yes — 330 As Welded is available for CNC machining and sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM B536 — Ni-Fe-Cr-Si Alloy Plate, Sheet and Strip (UNS N08330) — ASTM (2019)
- ASTM B511 / B512 / B535 / B546 / B710 — N08330 bar, castings, pipe, tube — ASTM (2019)
- RA330 Alloy Data Sheet — Rolled Alloys (2022)
- ASM Handbook Vol. 1 — Heat-Resistant Alloys; Vol. 13B — Corrosion — ASM International (1990)
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.