Stainless Steel
Stainless Steel Incoloy 800
Properties, tempers, machining, finishes and uses — values shown for the ANN condition.
A 32Ni-21Cr iron-nickel-chromium alloy with Al/Ti additions for oxidation and carburization resistance at elevated temperature, widely used as the baseline grade before the higher-strength 800H/800HT variants.
Reference datasheet — Incoloy 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.
What is Incoloy 800?
A 32Ni-21Cr iron-nickel-chromium alloy with Al/Ti additions for oxidation and carburization resistance at elevated temperature, widely used as the baseline grade before the higher-strength 800H/800HT variants. Incoloy 800 has a density of 7.94 g/cm³ (0.287 lb/in³), heavier than 78% of stainless steel grades. It melts at 1,357°C (2,475 °F). Incoloy 800 has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 84% of stainless steel grades. Elongation at break is 44% and the elastic modulus is 196 GPa (28.4 Msi).
What is Incoloy 800 used for?
- heat exchanger tubing
- furnace muffles and retorts
- petrochemical reformer tubing
- steam generator components
Advantages
- Forms and bends easily — 75/100, better than 87% of stainless steel grades
- Readily welded — 80/100, better than 79% of stainless steel grades
- High service temperature — 815°C (1,499 °F), better than 77% of stainless steel grades
Limitations
- Poor heat conductor — 11.5 W/m·K (6.64 BTU/hr·ft·°F), worse than 96% of stainless steel grades
- High embodied carbon — 6.5 kg CO₂/kg, worse than 92% of stainless steel grades
- Low electrical conductivity — 1.8 % IACS, worse than 88% of stainless steel grades
- Low strength — 260 MPa (37.7 ksi), worse than 84% of stainless steel grades
Incoloy 800 properties
Typical room-temperature values for Incoloy 800-ANN (default stocked condition for plate, sheet, tube and bar — maximum ductility, uniform grain structure and best corrosion/oxidation behaviour), compiled from standards, handbooks and producer data. Each bar shows where the value sits among the stainless steel grades in FabDigit's library — further right is higher. Other conditions have their own pages: see tempers.
Physical3
Incoloy 800 has a density of 7.94 g/cm³ (0.287 lb/in³), heavier than 78% of stainless steel grades. It melts at 1,357°C (2,475 °F).
Mechanical15
Incoloy 800 has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 84% of stainless steel grades. Elongation at break is 44% and the elastic modulus is 196 GPa (28.4 Msi).
Thermal5
Incoloy 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), worse than 96% of stainless steel grades. Thermal expansion is 14.4 µm/m·K (8 µin/in·°F).
Electrical3
Incoloy 800 conducts electricity at 1.8 % IACS, worse than 88% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), better than 74% of stainless steel grades.
Sustainability4
Producing a kilogram of Incoloy 800 takes about 95 MJ of energy and emits 6.5 kg of CO₂ — more than 96% of stainless steel grades. Typical recycled content is 45%.
Manufacturability8
Incoloy 800's machinability is poor (30/100, worse than 71% of stainless steel grades); weldability very good (80/100); formability very good (75/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Incoloy 800 tempers and conditions
Incoloy 800 is supplied in 7 conditions, each with its own property set. Open one for its full datasheet. ANN is what FabDigit quotes unless the drawing says otherwise.
- ANNDefaultDefault stocked condition for plate, sheet, tube and bar — maximum ductility, uniform grain structure and best corrosion/oxidation behaviour.260 MPa yield · 140 HB
- FHHighest room-temperature strength and hardness for spring strip, wire and cold-drawn tube; very limited formability and cold work is lost by recovery above ~500 °C.830 MPa yield · 31 HRC
- 1/2HChoose when roughly double the annealed yield strength is needed at room temperature with some residual bend ductility (springs, fasteners, stiff tubing).620 MPa yield · 23 HRC
- CDCold-drawn bar or tube with a low-temperature stress relief — good dimensional accuracy and surface finish with moderately raised yield.520 MPa yield · 215 HB
- 1/4HLight cold work for extra stiffness/yield in strip and tube while keeping useful bendability.470 MPa yield · 200 HB
- HFPick for heavy bar, forgings and thick plate where hot-worked strength is adequate and a machining allowance covers the scaled surface.310 MPa yield · 160 HB
1 further condition is listed below with a summary only.
| Condition | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ANNDefault Annealed (solution annealed, ~950–1100 °C, rapid cool) | Default stocked condition for plate, sheet, tube and bar — maximum ductility, uniform grain structure and best corrosion/oxidation behaviour. | 260 | 600 | 44 | 140 HB | — |
Hot Finished (hot rolled / hot worked, as-worked or hot-finished and annealed bar & plate) | Pick for heavy bar, forgings and thick plate where hot-worked strength is adequate and a machining allowance covers the scaled surface. | 310 | 620 | 38 | 160 HB | — |
Half-Hard (cold worked, ~20–25 % reduction) | Choose when roughly double the annealed yield strength is needed at room temperature with some residual bend ductility (springs, fasteners, stiff tubing). | 620 | 790 | 15 | 23 HRC | — |
Full-Hard (cold worked, ~40 %+ reduction) | Highest room-temperature strength and hardness for spring strip, wire and cold-drawn tube; very limited formability and cold work is lost by recovery above ~500 °C. | 830 | 970 | 7 | 31 HRC | — |
Quarter-Hard (cold worked, ~10 % reduction) | Light cold work for extra stiffness/yield in strip and tube while keeping useful bendability. | 470 | 700 | 25 | 200 HB | — |
Cold Drawn / Cold Worked and Stress Relieved (bar, wire, tube) | Cold-drawn bar or tube with a low-temperature stress relief — good dimensional accuracy and surface finish with moderately raised yield. | 520 | 730 | 20 | 215 HB | — |
As Welded (GTAW/GMAW joint with ERNiCr-3 filler) | Typical all-weld/joint properties when fabricating vessels and tubing without post-weld solution anneal. | 330 | 590 | 33 | — | — |
Working with Incoloy 800
Is Incoloy 800 easy to machine?
Machine like a tough austenitic: rigid setup, positive-rake sharp carbide, 15–35 m/min surface speed, heavy feed to cut under the work-hardened skin, and flood coolant — avoid dwelling.
Can Incoloy 800 be welded?
Readily welded by GTAW/GMAW/SMAW with ERNiCr-3 (Inconel 82) or ENiCrFe-3; no preheat, low heat input, clean sulphur-free surfaces, no post-weld heat treatment normally required.
Can Incoloy 800 be formed, bent or molded?
Excellent cold formability in the annealed condition but work-hardens faster than 304, so allow extra power and interstage anneals at 980–1050 °C; hot work between 870 and 1200 °C.
Strength versus weight in the stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. Incoloy 800 is highlighted; hover a dot for its name, or open the interactive family chart.
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 |
|---|---|---|
| Ni | 30 – 35 | 32.5 |
| Cr | 19 – 23 | 21 |
| C0.05–0.10 for 800H/800HT | ≤ 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 | 0.35 |
| TiAl+Ti also specified 0.30–1.20 in some specs | 0.15 – 0.6 | 0.35 |
| Febalance, 39.5 % minimum per ASTM | ≥ 39.5 (balance) | — |
What surface finishes work on Incoloy 800?
Not anodizable — pickle in HNO3/HF or grit blast plus passivate to restore the chromia film; polishes well and can be electropolished for high-purity service.
Surface treatments FabDigit runs on stainless steel parts — pick them in the quote configurator or call them out on the drawing.
Passivation
- Pickling
Plating
- Electroless Nickel (EN)
- Gold Plating
- Hard Chrome Plating
- Silver Plating
Organic Coating
- Epoxy Coating
Thermal Spray
- Plasma Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel Incoloy 800 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N08800
- ASTM
- B407/B408/B409
- EN / DIN / Werkstoff-Nr.
- 1.4876X10NiCrAlTi32-21
- Also called
- Incoloy800
How much does Incoloy 800 cost?
Incoloy 800 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 800 — frequently asked
What is Incoloy 800 used for?
Incoloy 800 is typically used for heat exchanger tubing, furnace muffles and retorts, petrochemical reformer tubing and steam generator components. In short: baseline 800-series alloy; oxidation and carburization resistant; cheaper than nickel-base alternatives.
What is the yield strength of Incoloy 800?
Incoloy 800 has a typical yield strength of 260 MPa (37.7 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 84% of stainless steel grades. Strength varies by condition: see the 7 listed tempers.
Is Incoloy 800 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 71% of stainless steel grades). Machine like a tough austenitic: rigid setup, positive-rake sharp carbide, 15–35 m/min surface speed, heavy feed to cut under the work-hardened skin, and flood coolant — avoid dwelling.
Can Incoloy 800 be welded?
Yes — weldability is rated very good (80/100). Readily welded by GTAW/GMAW/SMAW with ERNiCr-3 (Inconel 82) or ENiCrFe-3; no preheat, low heat input, clean sulphur-free surfaces, no post-weld heat treatment normally required.
What surface finishes work on Incoloy 800?
Not anodizable — pickle in HNO3/HF or grit blast plus passivate to restore the chromia film; polishes well and can be electropolished for high-purity service.
Can Incoloy 800 be formed, bent or molded?
Excellent cold formability in the annealed condition but work-hardens faster than 304, so allow extra power and interstage anneals at 980–1050 °C; hot work between 870 and 1200 °C.
What is the maximum service temperature of Incoloy 800?
Incoloy 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 Incoloy 800-ANN and Incoloy 800-FH?
ANN is the default condition — default stocked condition for plate, sheet, tube and bar — maximum ductility, uniform grain structure and best corrosion/oxidation behaviour. FH: highest room-temperature strength and hardness for spring strip, wire and cold-drawn tube; very limited formability and cold work is lost by recovery above ~500 °C. Yield strength is 260 MPa in ANN versus 830 MPa in FH.
How much does Incoloy 800 cost?
Incoloy 800 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 B409 / B408 / B407 (N08800 plate, bar, tube) — ASTM International (2022)
- INCOLOY alloy 800 technical bulletin — Special Metals Corporation (2004)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- EN 10095 / VdTÜV 434 — X10NiCrAlTi32-21 (1.4876) — CEN (2018)
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.