Stainless Steel Incoloy 801
UNS N08801 · ASTM B408
Incoloy 801 (N08801, ASTM B408) is a titanium-enriched variant of Alloy 800 — an Fe-Ni-Cr austenitic alloy that develops higher creep-rupture strength through age hardening.
Reference datasheet — Incoloy 801 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 Annealed condition
Incoloy 801 tempers and conditions
Incoloy 801 is supplied in 5 conditions, soft to hard. Annealed is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution Annealed | Chosen when maximum creep-rupture life and grain coarsening for high-temperature service are wanted, at the cost of some room-temperature strength. | 215 | 550 | 45 | 140 HB | 1.7 % IACS |
AnnealedDefault mill annealed (≈980–1040 °C, air/water cooled) | Standard stocked condition for plate, sheet, tube and bar; best ductility, formability and corrosion resistance. | 240 | 585 | 42 | 150 HB | — |
Stabilize Annealed / Aged | Use where long-term service near 500–700 °C or resistance to intergranular attack after welding is critical; TiC precipitation raises creep strength modestly. | 275 | 620 | 35 | 170 HB | 1.7 % IACS |
cold drawn bar/tube, lightly stress relieved | Pick for closer dimensional tolerance, better surface finish and higher yield strength on small-diameter bar and tube. | 450 | 690 | 25 | 17 HRC | 1.7 % IACS |
Cold Worked | For springs, thin strip and wire needing maximum room-temperature strength; ductility and weldability are reduced and strength is lost on heating above ~500 °C. | 750 | 900 | 8 | 28 HRC | 1.6 % IACS |
Supply forms, finishes and certifications
Ways Incoloy 801 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
HotFinished | Hot Finished | Surface finish |
What is Incoloy 801?
Incoloy 801 (N08801, ASTM B408) is a titanium-enriched variant of Alloy 800 — an Fe-Ni-Cr austenitic alloy that develops higher creep-rupture strength through age hardening. It is selected where standard Alloy 800 lacks high-temperature strength, and is stocked as bar, tube and hot-finished or cold-drawn product in annealed, solution-annealed and stabilize-annealed conditions; annealed properties are 240 MPa yield, 585 MPa tensile and 42% elongation. Maximum service temperature is 815 °C, aqueous corrosion resistance (score 66) is below the 6Mo superaustenitics, and availability is limited — Alloy 800H is the usual substitute. Incoloy 801 has a density of 7.94 g/cm³ (0.287 lb/in³), heavier than 78% of stainless steel grades. It melts at 1,355°C (2,471 °F). Incoloy 801 has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 585 MPa (84.8 ksi) — weaker than 96% of stainless steel grades. Elongation at break is 42% and the elastic modulus is 196 GPa (28.4 Msi).
What is Incoloy 801 used for?
- gas turbine and furnace hardware
- heat-treating fixtures
- high-temperature fasteners
- process industry tubing
Advantages
- Forms and bends easily — 70/100, better than 79% of stainless steel grades
- High service temperature — 815°C (1,499 °F), better than 77% of stainless steel grades
Limitations
- High embodied carbon — 8 kg CO₂/kg, worse than 99% of stainless steel grades
- Poor heat conductor — 11.5 W/m·K (6.64 BTU/hr·ft·°F), worse than 97% of stainless steel grades
- Low strength — 240 MPa (34.8 ksi), worse than 96% of stainless steel grades
- Low electrical conductivity — 1.7 % IACS, worse than 93% of stainless steel grades
Incoloy 801 properties
Typical room-temperature values for Incoloy 801-Annealed; bars are the position among stainless steel grades.
Physical3
Incoloy 801 has a density of 7.94 g/cm³ (0.287 lb/in³), heavier than 78% of stainless steel grades. It melts at 1,355°C (2,471 °F).
Mechanical13
Incoloy 801 has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 585 MPa (84.8 ksi) — weaker than 96% of stainless steel grades. Elongation at break is 42% and the elastic modulus is 196 GPa (28.4 Msi).
Thermal5
Incoloy 801 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), worse than 97% of stainless steel grades. Thermal expansion is 14.4 µm/m·K (8 µin/in·°F).
Electrical3
Incoloy 801 conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (66/100), better than 59% of stainless steel grades.
Sustainability4
Producing a kilogram of Incoloy 801 takes about 110 MJ of energy and emits 8 kg of CO₂ — more than 99% of stainless steel grades. Typical recycled content is 45%.
Manufacturability8
Incoloy 801's machinability is poor (30/100, worse than 70% of stainless steel grades); weldability very good (70/100); formability very good (70/100).
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 stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. Incoloy 801 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Incoloy 801
Is Incoloy 801 easy to machine?
Machine like an austenitic Fe-Ni-Cr alloy: rigid setup, positive-rake sharp carbide, slow speed with heavy positive feed, generous flood coolant to beat work hardening and gummy chips.
Can Incoloy 801 be welded?
Readily GTAW/GMAW/SMAW welded with Ni-Cr-Fe (ERNiCr-3 / ENiCrFe-3) or matching filler; keep heat input and interpass temperature low, avoid sulphur/lead contamination, no post-weld heat treatment normally needed thanks to Ti stabilisation.
Can Incoloy 801 be formed, bent or molded?
Good cold formability but high work-hardening rate — allow extra forming loads, intermediate anneals at 980–1040 °C for severe draws; hot work between about 900 and 1200 °C.
Incoloy 801 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 – 34 | 32 |
| Cr | 19 – 22 | 20.5 |
| Ticarbide stabiliser, key difference vs Alloy 800 | 0.75 – 1.5 | 1.1 |
| C | ≤ 0.1 | 0.05 |
| Mn | ≤ 1.5 | 0.8 |
| Si | ≤ 1 | 0.5 |
| Cu | ≤ 0.5 | 0.2 |
| S | ≤ 0.02 | 0.01 |
| Febalance, 39.5 % min per ASTM B408 | ≥ 39.5 (balance) |
What surface finishes work on Incoloy 801?
Pickle/passivate or electropolish after hot work to remove Ti-rich oxide scale; takes a good mechanical polish; not anodisable, and paint/plating are rarely used.
Surface treatments FabDigit runs on stainless steel 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).
Passivation
Organic Coating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel Incoloy 801 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N08801
- ASTM
- B408
- Also called
- Incoloy801
How much does Incoloy 801 cost?
Incoloy 801 is a high-cost stainless steel ($$$$), 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.
Incoloy 801 — frequently asked
What is Incoloy 801 used for?
Incoloy 801 is typically used for gas turbine and furnace hardware, heat-treating fixtures, high-temperature fasteners and process industry tubing. In short: ti-stabilized Alloy 800 variant; higher creep strength than 800; service to 815 °C.
What is the yield strength of Incoloy 801?
Incoloy 801 has a typical yield strength of 240 MPa (34.8 ksi) and a tensile strength of 585 MPa (84.8 ksi) — weaker than 96% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is Incoloy 801 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 70% of stainless steel grades). Machine like an austenitic Fe-Ni-Cr alloy: rigid setup, positive-rake sharp carbide, slow speed with heavy positive feed, generous flood coolant to beat work hardening and gummy chips.
Can Incoloy 801 be welded?
Yes — weldability is rated very good (70/100). Readily GTAW/GMAW/SMAW welded with Ni-Cr-Fe (ERNiCr-3 / ENiCrFe-3) or matching filler; keep heat input and interpass temperature low, avoid sulphur/lead contamination, no post-weld heat treatment normally needed thanks to Ti stabilisation.
What surface finishes work on Incoloy 801?
Pickle/passivate or electropolish after hot work to remove Ti-rich oxide scale; takes a good mechanical polish; not anodisable, and paint/plating are rarely used.
Can Incoloy 801 be formed, bent or molded?
Good cold formability but high work-hardening rate — allow extra forming loads, intermediate anneals at 980–1040 °C for severe draws; hot work between about 900 and 1200 °C.
What is the maximum service temperature of Incoloy 801?
Incoloy 801 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 801 Annealed and Incoloy 801 CW-Hard?
Annealed is the default condition — standard stocked condition for plate, sheet, tube and bar; best ductility, formability and corrosion resistance. CW-Hard: for springs, thin strip and wire needing maximum room-temperature strength; ductility and weldability are reduced and strength is lost on heating above ~500 °C. Yield strength is 240 MPa in Annealed versus 750 MPa in CW-Hard.
How much does Incoloy 801 cost?
Incoloy 801 is a high-cost stainless steel ($$$$), 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 B408 — Ni-Fe-Cr Alloy Rod and Bar (UNS N08800/N08801/N08810/N08811) — ASTM International (2019)
- 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)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- INCOLOY alloy 800 / 800H / 800HT and 801 technical bulletins — Special Metals Corporation (2004)
- ASME BPVC Section II Part D allowable stresses, N08801 — 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.