Incoloy 800H, also known as “Alloy 800H”, is designated as UNS N08810 or DIN W.Nr. 1.4958. It has almost the same chemical composition as Alloy 800 except that it requires a higher carbon addition resulting in improved high-temperature properties. Compared to Incoloy 800, it has better creep and stress-rupture characteristics in the 1100°F [592°C] to 1800°F [980°C] temperature range. While Incoloy 800 is usually annealed at at approximately 1800°F [980°C], Incoloy 800H should be annealed at approximately 2100°F [1150°C]. Besides, Alloy 800H has a coarser average grain size in accordance with ASTM 5.
| The Chemical Composition of Incoloy 800, % | |
|---|---|
| Nickel | 30.0-35.0 |
| Cromium | 19.0-23.0 |
| Iron | ≥39.5 |
| Carbon | 0.05-0.10 |
| Aluminum | 0.15-0.60 |
| Titanium | 0.15-0.60 |
| Manganese | ≤1.50 |
| Sulfur | ≤0.015 |
| Silicon | ≤1.00 |
| Copper | ≤0.75 |
| Al+Ti | 0.30-1.20 |
ASTM B163 UNS N08810, Incoloy 800H seamless pipes, 1-1/4″ x 0.083″(W.T) x 16.6′(L).
| Tensile Strength, min. | Yield Strength, min. | Elongation, min. | Hardness, min. | ||
|---|---|---|---|---|---|
| Mpa | ksi | Mpa | ksi | % | HB |
| 600 | 87 | 295 | 43 | 44 | 138 |
| Density | Melting Range | Specific Heat | Electrical Resistivity | ||
|---|---|---|---|---|---|
| g/cm3 | °C | °F | J/kg. k | Btu/lb.°F | µΩ·m |
| 7.94 | 1357-1385 | 2475-2525 | 460 | 0.110 | 989 |
| Product From | Standard |
|---|---|
| Rod and Bar | ASTM B408, EN 10095 |
| Plate, Sheet & Strip | ASTM A240, A480, ASTM B409, B906 |
| Seamless Pipe & Tube | ASTM B829, B407 |
| Welded Pipe & Tube | ASTM B514, B515, B751, B775 |
| Welded fittings | ASTM B366 |
| Forging | ASTM B564, DIN 17460 |