Alloy 800H and 800HT are nickel-iron-chromium alloys developed for applications requiring high-temperature strength and resistance to oxidation and carburization. Compared with Alloy 800, the controlled carbon, aluminum, and titanium contents of 800H/800HT provide improved creep and rupture strength at elevated temperatures.
These alloys are widely used in petrochemical processing, heat exchangers, furnace components, industrial heating equipment, steam/hydrocarbon reforming, and power generation. Their excellent structural stability and resistance to high-temperature corrosion make them suitable for prolonged exposure to severe thermal environments.
Final chemical, mechanical properties, dimensions and tolerances are confirmed against the governing specification and purchase order.
| Element | C | Si | Mn | P | S | Ni | Cr | Fe | Al | Ti | Al + Ti |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | 0.05 | - | - | - | - | 30.00 | 19.00 | 39.50 | 0.15 | 0.15 | 0.85 |
| Max | 0.10 | 1.00 | 1.50 | 0.030 | 0.015 | 35.00 | 23.00 | - | 0.60 | 0.60 | 1.20 |
| Property | Yield Strength | Tensile Strength | Elongation | Hardness |
|---|---|---|---|---|
| Min | 25 ksi [170 MPa] | 65 ksi [450 MPa] | 30% | - |
| Max | - | - | - | 35 HRC |
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