Nickel Alloy Incoloy 800-ANN (Annealed)
Heat-treated state · default condition
UNS N08800 · EN 1.4876, X10NiCrAlTi32-21 · JIS NCF800
Standard stocked condition for fabrication, forming and welding; best ductility and corrosion resistance below ~600 °C.
Values for the ANN condition
Other Incoloy 800 tempers and conditions
Incoloy 800 is listed in 6 conditions; see the grade overview at Incoloy 800.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution Annealed | Pick when creep and stress-rupture life above 600 °C matter (equivalent practice to 800H heat treatment). | 215 | 550 | 48 | 125 HB | 1.7 % IACS |
ANNDefaultThis page Annealed | Standard stocked condition for fabrication, forming and welding; best ductility and corrosion resistance below ~600 °C. | 250 | 600 | 45 | 140 HB | — |
Cold Drawn + Annealed | Standard heat-exchanger and boiler tubing condition: close tolerances, bright oxide-free surface, fully soft. | 260 | 610 | 43 | 145 HB | 1.7 % IACS |
Cold Drawn + Stress Relieved | For machined or bent cold-drawn parts where residual stress and distortion must be reduced while keeping most of the cold-work strength. | 430 | 670 | 30 | 185 HB | 1.7 % IACS |
Cold drawn | Use where higher room-temperature strength, straightness and better chip control are needed for machined parts and fasteners. | 500 | 720 | 25 | 200 HB | — |
Cold Worked, Hard | Select for springs, thermocouple sheathing and clips needing maximum room-temperature strength; not for service above ~500 °C. | 680 | 850 | 12 | 24 HRC | 1.7 % IACS |
What is Incoloy 800-ANN?
Incoloy 800-ANN is Incoloy 800 heat treated to ANN — standard stocked condition for fabrication, forming and welding; best ductility and corrosion resistance below ~600 °C. Incoloy 800-ANN 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 GPa (28.4 Msi). Incoloy 800-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).
Advantages
- Low embodied carbon — 7 kg CO₂/kg, better than 98% of nickel alloy grades
- Forms and bends easily — 80/100, better than 91% of nickel alloy grades
- Easy to machine — 30/100, better than 90% 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
Incoloy 800-ANN properties
Typical room-temperature values for Incoloy 800-ANN; 12 are specific to this condition. Other listed values are Incoloy 800 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
Incoloy 800-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).
Mechanical14
Incoloy 800-ANN 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 GPa (28.4 Msi).
Thermal6
Incoloy 800-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
Incoloy 800-ANN conducts electricity at 1.7 % IACS, better than 80% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), worse than 71% of nickel alloy grades.
Sustainability4
Producing a kilogram of Incoloy 800-ANN takes about 95 MJ of energy and emits 7 kg of CO₂ — less than 97% of nickel alloy grades. Typical recycled content is 40%.
Manufacturability8
Incoloy 800-ANN's machinability is poor (30/100, better than 90% of nickel alloy grades); weldability very good (78/100); formability very good (80/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Incoloy 800-ANN
Is Incoloy 800 easy to machine?
Machine like a tough austenitic alloy: rigid setup, positive-rake sharp carbide, 20–40 m/min, heavy constant feed to cut under the work-hardened layer, flood emulsion or sulfochlorinated oil.
Can Incoloy 800 be welded?
Readily welded by GTAW/GMAW/SMAW with ERNiCr-3 (82) or ENiCrFe-2/3 filler; keep interpass below ~150 °C, low heat input, no preheat and no PWHT normally required.
Can Incoloy 800 be formed, bent or molded?
Excellent cold formability but rapid work hardening — allow ~50% more press force than 304 and interstage anneal at 980 °C; hot work 900–1200 °C, finish above 900 °C.
What surface finishes work on Incoloy 800?
Pickle in HNO3-HF or grit-blast then passivate to remove the tenacious Cr/Ti oxide before service; can be electropolished or mechanically polished, but not anodized.
Incoloy 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 |
|---|---|---|
| Niper ASTM B409 / UNS N08800 | 30 – 35 | 32.5 |
| Cr | 19 – 23 | 21 |
| C | ≤ 0.1 | 0.05 |
| Mn | ≤ 1.5 | 0.8 |
| Si | ≤ 1 | 0.5 |
| S | ≤ 0.02 | 0.01 |
| Cu | ≤ 0.75 | 0.3 |
| Al | 0.15 – 0.6 | 0.38 |
| Ti | 0.15 – 0.6 | 0.38 |
| Fe39.5 % min, remainder | ≥ 39.5 (balance) | — |
Incoloy 800-ANN — frequently asked
What is Incoloy 800-ANN used for?
Incoloy 800-ANN is typically used for furnace muffles/baskets, heat exchanger tubing, petrochemical piping and radiant tubes. In short: cost-effective 800-family base; carburization-resistant Fe-Ni-Cr; no creep grain-size control.
What is the yield strength of Incoloy 800-ANN?
Incoloy 800-ANN 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 Incoloy 800-ANN easy to machine?
Not especially — machinability is rated poor (30/100, better than 90% of nickel alloy grades). Machine like a tough austenitic alloy: rigid setup, positive-rake sharp carbide, 20–40 m/min, heavy constant feed to cut under the work-hardened layer, flood emulsion or sulfochlorinated oil.
Can Incoloy 800-ANN be welded?
Yes — weldability is rated very good (78/100). Readily welded by GTAW/GMAW/SMAW with ERNiCr-3 (82) or ENiCrFe-2/3 filler; keep interpass below ~150 °C, low heat input, no preheat and no PWHT normally required.
What surface finishes work on Incoloy 800-ANN?
Pickle in HNO3-HF or grit-blast then passivate to remove the tenacious Cr/Ti oxide before service; can be electropolished or mechanically polished, but not anodized.
Can Incoloy 800-ANN be formed, bent or molded?
Excellent cold formability but rapid work hardening — allow ~50% more press force than 304 and interstage anneal at 980 °C; hot work 900–1200 °C, finish above 900 °C.
What is the maximum service temperature of Incoloy 800-ANN?
Incoloy 800-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 Incoloy 800-ANN and Incoloy 800 CW-H?
ANN is the default condition — standard stocked condition for fabrication, forming and welding; best ductility and corrosion resistance below ~600 °C. CW-H: select for springs, thermocouple sheathing and clips needing maximum room-temperature strength; not for service above ~500 °C. Yield strength is 250 MPa in ANN versus 680 MPa in CW-H.
Sources
- ASTM B409 / B408 / B407 (Alloy 800 plate, bar, tube) — ASTM International (2021)
- EN 10095 / DIN 17460 — X10NiCrAlTi32-21 (1.4876) — CEN (2018)
- INCOLOY alloys 800, 800H, 800HT technical bulletin — Special Metals Corporation (2004)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- GB/T 15007 (NS1101) — SAC (2017)
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.