Stainless Steel N08332-HF
Grade
UNS N08332 · ASTM B407/B409/B729
HF = hot Finished bar / forged and annealed
Bar and forged shapes for furnace fixtures, grate bars and hardware sections above ~25 mm.
Values for the HF condition
Other N08332 tempers and conditions
N08332 is listed in 4 conditions; see the grade overview at N08332.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault solution annealed (mill anneal, ~1065–1150 °C, rapid cool) | Standard stocked condition for plate, sheet, tube and welded fabrication; best ductility and toughness for high-temperature and cryogenic service. | 250 | 585 | 45 | 150 HB | — |
As-welded deposit | Property reference for fabricated weldments left in the as-welded condition; joint strength matches base metal but ductility of the fusion zone is lower. | 280 | 570 | 32 | 165 HB | 1.7 % IACS |
HFThis page Hot Finished bar / forged and annealed | Bar and forged shapes for furnace fixtures, grate bars and hardware sections above ~25 mm. | 290 | 605 | 40 | 165 HB | 1.7 % IACS |
Cold drawn | Higher strength, closer tolerance bar for machined fixtures, pins and studs where extra yield strength is useful below ~600 °C. | 550 | 760 | 25 | 215 HB | — |
What is N08332-HF?
N08332-HF is N08332 in the HF grade — bar and forged shapes for furnace fixtures, grate bars and hardware sections above ~25 mm. N08332-HF has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 605 MPa (87.7 ksi) — weaker than 72% of stainless steel grades. Elongation at break is 40% and the elastic modulus is 196 GPa (28.4 Msi). N08332-HF has a density of 7.94 g/cm³ (0.287 lb/in³), heavier than 78% of stainless steel grades. It melts at 1,345°C (2,453 °F). Annealed is the default condition FabDigit quotes; HF 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
- Tough — resists crack growth — 185 MPa·√m (168.4 ksi·√in), better than 77% of stainless steel grades
Limitations
- High embodied carbon — 7 kg CO₂/kg, worse than 96% 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
N08332-HF properties
Typical room-temperature values for N08332-HF; 22 are specific to this condition. Other listed values are N08332 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
N08332-HF has a density of 7.94 g/cm³ (0.287 lb/in³), heavier than 78% of stainless steel grades. It melts at 1,345°C (2,453 °F).
Mechanical16
N08332-HF has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 605 MPa (87.7 ksi) — weaker than 72% of stainless steel grades. Elongation at break is 40% and the elastic modulus is 196 GPa (28.4 Msi).
Thermal6
N08332-HF 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
N08332-HF 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 N08332-HF takes about 95 MJ of energy and emits 7 kg of CO₂ — more than 96% of stainless steel grades. Typical recycled content is 40%.
Manufacturability8
N08332-HF's machinability is poor (32/100, worse than 62% of stainless steel grades); weldability very good (70/100); formability good (64/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with N08332-HF
Is N08332 easy to machine?
Work-hardens rapidly and is gummy — use rigid setups, positive-rake carbide, heavy feeds with no dwell, low-to-moderate speeds (~20–35 m/min) and copious sulfur-free coolant.
Can N08332 be welded?
Readily welded by GTAW/GMAW/SMAW with matching 330 or higher-Ni filler; keep interpass temperature low, avoid heavy restraint and sulfur contamination to prevent hot cracking.
Can N08332 be formed, bent or molded?
Very ductile when annealed — good for deep drawing, spinning and roll forming, but requires ~50 % more power than 304 and intermediate anneals for severe work.
What surface finishes work on N08332?
Pickle or bead-blast plus passivation after hot work; not anodizable — electropolishing or mechanical polishing gives the best high-temperature surface.
N08332 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 |
| Cr | 17 – 20 | 18.5 |
| SiSi is deliberate — key to oxidation and carburization resistance | 0.75 – 1.5 | 1.1 |
| Ccontrolled low carbon vs N08330 | ≤ 0.08 | 0.05 |
| Mn | ≤ 2 | 1.2 |
| P | ≤ 0.03 | — |
| S | ≤ 0.03 | — |
| Curestricted in the controlled-chemistry variant | ≤ 1 | — |
| Febalance, approx. 43 % | balance | — |
N08332-HF — frequently asked
What is N08332-HF used for?
N08332-HF is typically used for cryogenic vessels and piping, furnace and heat-treat fixtures, carburizing/heat-resistant components and petrochemical process equipment. In short: cryogenic to 1100 °C service; controlled-chemistry Alloy 330; high-nickel carburization resistance.
What is the yield strength of N08332-HF?
N08332-HF has a typical yield strength of 290 MPa (42.1 ksi) and a tensile strength of 605 MPa (87.7 ksi) — weaker than 72% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is N08332-HF easy to machine?
Not especially — machinability is rated poor (32/100, worse than 62% of stainless steel grades). Work-hardens rapidly and is gummy — use rigid setups, positive-rake carbide, heavy feeds with no dwell, low-to-moderate speeds (~20–35 m/min) and copious sulfur-free coolant.
Can N08332-HF be welded?
Yes — weldability is rated very good (70/100). Readily welded by GTAW/GMAW/SMAW with matching 330 or higher-Ni filler; keep interpass temperature low, avoid heavy restraint and sulfur contamination to prevent hot cracking.
What surface finishes work on N08332-HF?
Pickle or bead-blast plus passivation after hot work; not anodizable — electropolishing or mechanical polishing gives the best high-temperature surface.
Can N08332-HF be formed, bent or molded?
Very ductile when annealed — good for deep drawing, spinning and roll forming, but requires ~50 % more power than 304 and intermediate anneals for severe work.
What is the maximum service temperature of N08332-HF?
N08332-HF 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 N08332 Annealed and N08332-CD?
Annealed is the default condition — standard stocked condition for plate, sheet, tube and welded fabrication; best ductility and toughness for high-temperature and cryogenic service. CD: higher strength, closer tolerance bar for machined fixtures, pins and studs where extra yield strength is useful below ~600 °C. Yield strength is 250 MPa in Annealed versus 550 MPa in CD.
Sources
- ASTM B409 — Ni-Fe-Cr Alloy Plate, Sheet and Strip — ASTM International (2021)
- ASTM B407 — Ni-Fe-Cr Alloy Seamless Pipe and Tube — ASTM International (2019)
- ASTM B729 — Seamless UNS N08020/N08026/N08024 Pipe and Tube (companion Ni-Fe-Cr practice) — ASTM International (2020)
- ASTM B408 — Ni-Fe-Cr Alloy Rod and Bar — ASTM International (2019)
- ASM Handbook Vol.1: Properties and Selection — Heat-Resistant Fe-Ni-Cr Alloys — ASM International (1990)
- ASM Handbook Vol.13B: Corrosion — High-Temperature Corrosion — ASM International (2005)
- Alloy 330 / RA330 technical data (35Ni-19Cr heat-resistant alloy) — Specialty alloy producers (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.