Nickel Alloy 800 HF-ANN
Finish state
UNS N08800 · EN 1.4876, X10NiCrAlTi32-21
HF-ANN = hot finished, annealed
Choose for heavy sections and forgings where cold drawing is impractical; slightly coarser grain and lower hardness than cold-finished stock.
Values for the HF-ANN condition
Other 800 tempers and conditions
800 is listed in 6 conditions; see the grade overview at 800.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
800H | Use above ~600 °C where creep-rupture strength governs — furnace tubes, reformer and pigtail service under ASME code to 899 °C. | 220 | 550 | 48 | 130 HB | 1.7 % IACS |
800HT | Highest creep-rupture life of the 800 family; specified for ethylene/hydrogen reformer tubes and long-life 850–950 °C components. | 230 | 560 | 45 | 135 HB | 1.7 % IACS |
ANNDefault Annealed | Default stocked condition for 800 plate, sheet, tube and bar; best ductility, formability and corrosion resistance. | 250 | 600 | 45 | 138 HB | — |
HF-ANNThis page Hot finished, annealed | Choose for heavy sections and forgings where cold drawing is impractical; slightly coarser grain and lower hardness than cold-finished stock. | 275 | 585 | 42 | 150 HB | 1.7 % IACS |
As-welded deposit | Reference condition for weldments; joints normally overmatch base-metal strength and are used as-welded without PWHT except for stabilizing service. | 320 | 600 | 35 | 160 HB | 1.7 % IACS |
Cold drawn | Pick when higher room-temperature strength, straightness and surface finish are needed; ductility and formability drop and stress-relief may be required. | 500 | 720 | 25 | 210 HB | — |
What is 800 HF-ANN?
800 HF-ANN is 800 supplied in the HF-ANN condition — choose for heavy sections and forgings where cold drawing is impractical; slightly coarser grain and lower hardness than cold-finished stock. 800 HF-ANN has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 585 MPa (84.8 ksi) — weaker than 83% of nickel alloy grades. Elongation at break is 42% and the elastic modulus is 196.5 GPa (28.5 Msi). 800 HF-ANN has a density of 7.94 g/cm³ (0.287 lb/in³), lighter than 88% of nickel alloy grades. It melts at 1,357°C (2,475 °F). ANN is the default condition FabDigit quotes; HF-ANN is available on request or by drawing note.
Advantages
- Low embodied carbon — 7.5 kg CO₂/kg, better than 96% of nickel alloy grades
- Readily welded — 85/100, better than 83% of nickel alloy grades
- High electrical conductivity — 1.7 % IACS, better than 80% of nickel alloy grades
- Forms and bends easily — 72/100, better than 77% of nickel alloy grades
Limitations
- Low strength — 275 MPa (39.9 ksi), worse than 83% of nickel alloy grades
800 HF-ANN properties
Typical room-temperature values for 800 HF-ANN; 22 are specific to this condition. Other listed values are 800 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
800 HF-ANN has a density of 7.94 g/cm³ (0.287 lb/in³), lighter than 88% of nickel alloy grades. It melts at 1,357°C (2,475 °F).
Mechanical15
800 HF-ANN has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 585 MPa (84.8 ksi) — weaker than 83% of nickel alloy grades. Elongation at break is 42% and the elastic modulus is 196.5 GPa (28.5 Msi).
Thermal6
800 HF-ANN is rated for continuous service to 815°C (1,499 °F). It conducts heat at 11.5 W/m·K (6.64 BTU/hr·ft·°F), better than 57% of nickel alloy grades. Thermal expansion is 14.4 µm/m·K (8 µin/in·°F).
Electrical3
800 HF-ANN conducts electricity at 1.7 % IACS, better than 80% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (75/100), worse than 63% of nickel alloy grades.
Sustainability4
Producing a kilogram of 800 HF-ANN takes about 95 MJ of energy and emits 7.5 kg of CO₂ — less than 97% of nickel alloy grades. Typical recycled content is 40%.
Manufacturability7
800 HF-ANN's machinability is poor (28/100, better than 82% of nickel alloy grades); weldability excellent (85/100); formability very good (72/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 800 HF-ANN
Is 800 easy to machine?
Machine like a work-hardening austenitic alloy: rigid setup, positive-rake sharp carbide, low speed (20–35 m/min) with heavy constant feed and flood sulfo-chlorinated coolant, never dwell in the cut.
Can 800 be welded?
Readily welded by GTAW/GMAW/SMAW with ERNiCr-3(82) or ENiCrFe-3 filler, low heat input, no preheat and no PWHT required for most service; keep sulfur and lead contamination off the joint.
Can 800 be formed, bent or molded?
Excellent cold formability in the annealed condition but ~2× the power of 304; hot work 900–1200 °C and re-anneal at 980–1010 °C (800H/HT 1120–1180 °C for coarse grain).
What surface finishes work on 800?
Not anodizable — pickle in HNO3-HF or grit blast plus passivation, electropolish or mechanically polish; oxide scale after high-temperature service is tenacious and needs acid descaling.
800 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 | 30 – 35 | 32.5 |
| Cr | 19 – 23 | 21 |
| C800H/800HT: 0.05–0.10; 800HT: 0.06–0.10 | ≤ 0.1 | 0.05 |
| Al800HT: Al+Ti 0.85–1.20 | 0.15 – 0.6 | 0.38 |
| Ti800HT: Al+Ti 0.85–1.20 | 0.15 – 0.6 | 0.38 |
| Mn | ≤ 1.5 | 0.75 |
| Si | ≤ 1 | 0.4 |
| Cu | ≤ 0.75 | 0.3 |
| S | ≤ 0.02 | 0.01 |
| Fe39.5 % min per ASTM B409/B408 | ≥ 39.5 (balance) | — |
800 HF-ANN — frequently asked
What is 800 HF-ANN used for?
800 HF-ANN is typically used for furnace muffles and radiant tubes, heat exchanger tubing, petrochemical cracking coils and steam generator tubing. In short: carburization-resistant Fe-Ni-Cr alloy; highly weldable furnace grade; 800H/HT add creep strength.
What is the yield strength of 800 HF-ANN?
800 HF-ANN has a typical yield strength of 275 MPa (39.9 ksi) and a tensile strength of 585 MPa (84.8 ksi) — weaker than 83% of nickel alloy grades. Strength varies by condition: see the 6 listed tempers.
Is 800 HF-ANN easy to machine?
Not especially — machinability is rated poor (28/100, better than 82% of nickel alloy grades). Machine like a work-hardening austenitic alloy: rigid setup, positive-rake sharp carbide, low speed (20–35 m/min) with heavy constant feed and flood sulfo-chlorinated coolant, never dwell in the cut.
Can 800 HF-ANN be welded?
Yes — weldability is rated excellent (85/100). Readily welded by GTAW/GMAW/SMAW with ERNiCr-3(82) or ENiCrFe-3 filler, low heat input, no preheat and no PWHT required for most service; keep sulfur and lead contamination off the joint.
What surface finishes work on 800 HF-ANN?
Not anodizable — pickle in HNO3-HF or grit blast plus passivation, electropolish or mechanically polish; oxide scale after high-temperature service is tenacious and needs acid descaling.
Can 800 HF-ANN be formed, bent or molded?
Excellent cold formability in the annealed condition but ~2× the power of 304; hot work 900–1200 °C and re-anneal at 980–1010 °C (800H/HT 1120–1180 °C for coarse grain).
What is the maximum service temperature of 800 HF-ANN?
800 HF-ANN is rated for continuous use to about 815°C (1,499 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 800-ANN and 800-CD?
ANN is the default condition — default stocked condition for 800 plate, sheet, tube and bar; best ductility, formability and corrosion resistance. CD: pick when higher room-temperature strength, straightness and surface finish are needed; ductility and formability drop and stress-relief may be required. Yield strength is 250 MPa in ANN versus 500 MPa in CD.
Sources
- ASTM B409 / B408 / B407 — Alloy 800, 800H, 800HT plate, bar and tube — ASTM International (2021)
- INCOLOY alloys 800, 800H and 800HT technical bulletin — Special Metals Corporation (2004)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- EN 10095 / DIN 1.4876 (X10NiCrAlTi32-21) heat-resisting steels and nickel alloys — CEN (2018)
- ASME BPVC Section II Part D — allowable stresses for N08800/N08810/N08811 — ASME (2023)
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.