Incoloy Alloys
Incoloy 800 (UNS N08800) — Composition, Properties & Supply
Incoloy 800 (UNS N08800) is an iron-nickel-chromium heat-resistant alloy with 30–35% nickel and 19–23% chromium. It stays microstructurally stable and oxidation resistant at temperature while resisting nitric and organic acids, making it a cost-effective choice for heat exchangers and furnace tubing.
What is the chemical composition of Incoloy 800?
| Element | Symbol | Content (wt%) |
|---|---|---|
| Ni | Ni | 30.0–35.0 |
| Cr | Cr | 19.0–23.0 |
| Fe | Fe | ≥ 39.5 |
| Al | Al | 0.15–0.60 |
| Ti | Ti | 0.15–0.60 |
| Cu | Cu | ≤ 0.75 |
| C | C | ≤ 0.10 |
| Mn | Mn | ≤ 1.50 |
| Si | Si | ≤ 1.00 |
Values are typical specification limits. Actual heat analysis is reported on the EN 10204 3.1 mill test certificate supplied with each shipment.
What are the mechanical properties of Incoloy 800?
| Property | Value | Note |
|---|---|---|
| Tensile strength | ≥ 520 MPa | Room temperature |
| Yield strength (0.2% offset) | ≥ 205 MPa | Room temperature |
| Elongation | ≥ 30 % | Gauge length 50 mm / 4D |
| Hardness | ≤ 180 HB | Brinell / Rockwell |
What are the physical properties of Incoloy 800?
| Property | Value |
|---|---|
| Density | 7.94 g/cm³ |
| Melting range | 1357–1385 °C |
| Thermal conductivity | 11.5 W/m·K |
| Elastic modulus | 196 GPa |
| Maximum service temperature | 1100 °C |
What are the key characteristics of Incoloy 800?
- Iron-base chemistry costs less than comparable nickel alloys
- Oxidation resistant to about 1100 °C
- Resists nitric acid, organic acids and high-temperature steam
- Structurally stable — resists sigma phase formation
Where is Incoloy 800 used?
- Heat exchanger and evaporator tube bundles
- Nitric acid and caprolactam plant
- Steam superheaters and boiler tubes
- Heat-treat furnace components
Which standards and specifications cover Incoloy 800?
What product forms are available?
Frequently asked questions
What is the difference between 800, 800H and 800HT?
The chemistries are close; the difference is carbon content and heat treatment. 800 (C ≤ 0.10%) serves below 600 °C. 800H (C 0.05–0.10%) is solution annealed above 1120 °C to obtain a coarse grain (ASTM 5 or coarser) for improved creep strength up to about 815 °C. 800HT (C 0.06–0.10% with Al+Ti 0.85–1.20%) has a tighter composition and is solution treated for the highest creep-rupture strength, and is the standard choice for stressed components above 815 °C.
Need Incoloy 800 bar, tube, plate or forgings?
Send the grade, dimensions, standard and quantity. We answer within 10 minutes on working days and quote within 24 hours, with EN 10204 3.1 certification.
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