Nickel Alloy 800
UNS N08800 · EN 1.4876, X10NiCrAlTi32-21
800 is an Fe-Ni-Cr heat-resisting alloy (N08800/N08810/N08811, 1.4876, X10NiCrAlTi32-21) with a stable austenitic matrix plus Al and Ti additions rather than precipitation hardening.
Reference datasheet — 800 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the ANN condition
800 tempers and conditions
800 is supplied in 6 conditions, soft to hard. ANN is the default FabDigit quotes; the values on this page are for it.
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 | — |
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?
800 is an Fe-Ni-Cr heat-resisting alloy (N08800/N08810/N08811, 1.4876, X10NiCrAlTi32-21) with a stable austenitic matrix plus Al and Ti additions rather than precipitation hardening. It is specified for carburization and oxidation resistance in furnace and process equipment, and is supplied as tube, pipe, plate, sheet and bar in annealed, cold-drawn and 800H/800HT solution-annealed conditions; annealed values are 250 MPa yield, 600 MPa tensile, 45% elongation, 138 HB (80 HRB) and service to 815 °C. Strength is modest and machinability low (score 30), so Alloy 625 is the usual step up when higher strength or aqueous corrosion resistance is needed. 800 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). 800 has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 87% of nickel alloy grades. Elongation at break is 45% and the elastic modulus is 196.5 GPa (28.5 Msi).
What is 800 used for?
- furnace muffles and radiant tubes
- heat exchanger tubing
- petrochemical cracking coils
- steam generator tubing
Advantages
- Low embodied carbon — 7.5 kg CO₂/kg, better than 96% of nickel alloy grades
- Easy to machine — 30/100, better than 90% of nickel alloy grades
- Forms and bends easily — 78/100, better than 87% 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
Limitations
- Low strength — 250 MPa (36.3 ksi), worse than 87% of nickel alloy grades
800 properties
Typical room-temperature values for 800-ANN; bars are the position among nickel alloy grades.
Physical3
800 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 has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 87% of nickel alloy grades. Elongation at break is 45% and the elastic modulus is 196.5 GPa (28.5 Msi).
Thermal6
800 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 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 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's machinability is poor (30/100, better than 90% of nickel alloy grades); weldability excellent (85/100); formability very good (78/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the nickel alloy family
Yield strength against density for every nickel alloy grade FabDigit runs. 800 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 800
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).
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) |
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.
Surface treatments FabDigit runs on nickel alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Plating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Nickel Alloy 800 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N08800
- EN / DIN / Werkstoff-Nr.
- 1.4876X10NiCrAlTi32-21
- Similar grades
- N08810N08811
How much does 800 cost?
800 is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
800 — frequently asked
What is 800 used for?
800 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?
800 has a typical yield strength of 250 MPa (36.3 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 87% of nickel alloy grades. Strength varies by condition: see the 6 listed tempers.
Is 800 easy to machine?
Not especially — machinability is rated poor (30/100, better than 90% 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 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?
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 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?
800 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.
How much does 800 cost?
800 is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.