Stainless Steel 330 · finish state
Stainless Steel 330 Hot Finished
Properties of the Hot Finished condition, compared with the other 330 tempers.
Economical heavy bar, forgings and thick plate for furnace fixtures and retorts where surface finish and tight tolerance are not critical.
What is 330 Hot Finished?
330 Hot Finished is 330 supplied in the Hot Finished condition — economical heavy bar, forgings and thick plate for furnace fixtures and retorts where surface finish and tight tolerance are not critical. 330 Hot Finished has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 71% of stainless steel grades. Elongation at break is 40% and the elastic modulus is 196 GPa (28.4 Msi). 330 Hot Finished 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; Hot Finished is available on request or by drawing note.
Advantages
- High service temperature — 1,150°C (2,102 °F), better than 99% 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 87% of stainless steel grades
330 Hot Finished properties
Typical room-temperature values for 330 Hot Finished — 8 properties are specific to this condition; the rest are grade-level values shared by every 330 temper. Each bar shows where the value sits among the stainless steel grades in FabDigit's library — further right is higher.
Physical3
330 Hot Finished 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 Hot Finished has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 71% of stainless steel grades. Elongation at break is 40% and the elastic modulus is 196 GPa (28.4 Msi).
Thermal6
330 Hot Finished is rated for continuous service to 1,150°C (2,102 °F). It conducts heat at 12.6 W/m·K (7.28 BTU/hr·ft·°F), worse than 87% of stainless steel grades. Thermal expansion is 14.4 µm/m·K (8 µin/in·°F).
Electrical3
330 Hot Finished conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 53% of stainless steel grades.
Sustainability4
Producing a kilogram of 330 Hot Finished 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 Hot Finished's machinability is poor (32/100, worse than 62% of stainless steel grades); weldability good (62/100); formability good (65/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other 330 tempers and conditions
330 is also supplied in 4 other conditions. The full side-by-side table is on the 330 overview.
- Solution AnnealedDefaultStandard supply condition for sheet, plate, pipe and bar — maximum ductility and best high-temperature oxidation/carburisation performance.270 MPa yield · 150 HB
- Cold DrawnChoose 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 MPa yield · 200 HB
- Hot FinishedEconomical heavy bar, forgings and thick plate for furnace fixtures and retorts where surface finish and tight tolerance are not critical.290 MPa yield · 160 HB
- AnnealedGeneral soft annealed stock for forming and deep-drawn furnace parts where maximum formability is wanted.250 MPa yield · 145 HB
Working with 330 Hot Finished
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 Hot Finished — frequently asked
What is 330 Hot Finished used for?
330 Hot Finished 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 Hot Finished?
330 Hot Finished has a typical yield strength of 290 MPa (42.1 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 71% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is 330 Hot Finished easy to machine?
Not especially — machinability is rated poor (32/100, worse than 62% 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 Hot Finished be welded?
Yes — weldability is rated good (62/100). 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 Hot Finished?
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 Hot Finished 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 Hot Finished?
330 Hot Finished is rated for continuous use to about 1,150°C (2,102 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in 330 Hot Finished?
Yes — 330 Hot Finished is available for CNC machining and sheet metal with instant online pricing. 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.