Alloy 800HT (Incoloy 800HT)
The creep-optimised version of Alloy 800. Controlled carbon plus a combined aluminium and titanium window of 0.85 - 1.20% gives far better creep rupture strength above 600 C, so 800HT is the grade for the hottest reformer and pigtail service rather than plain 800.
- Creep rupture strength qualified for service above 600 C
- Controlled Al + Ti and grain size for long term stability
- Direct upgrade from Alloy 800 / 800H in reformer service
- Available as seamless pipe, BA finish tube and plate
Available forms & sizes
| Form | Size range |
|---|---|
| Seamless Pipes & Tubes | 1/2" - 16" NB, SCH 10S - SCH 160, seamless |
| Seamless Pipes & Tubes | 6 - 88.9 mm OD tube, BA / bright annealed finish |
| Plates | 3 - 50 mm thk, hot rolled and solution annealed |
| Round Bars | 10 - 300 mm dia |
| Fittings | 1/2" - 24" butt weld fittings and flanges |
Chemical composition (%)
| Element | Min | Max |
|---|---|---|
| Ni | 30.0 | 35.0 |
| Cr | 19.0 | 23.0 |
| Fe | 39.5 | - |
| C | 0.06 | 0.10 |
| Al + Ti | 0.85 | 1.20 |
Mechanical properties
| Property | Value | Unit |
|---|---|---|
| Yield Strength (0.2%) | 170 min | MPa |
| Tensile Strength | 450 min | MPa |
| Elongation | 30 min | % |
| Condition | Solution annealed, grain size controlled | - |
Physical properties
| Property | Value | Unit |
|---|---|---|
| Density | 7.94 | g/cm3 |
| Max Service Temperature | 1100 (short term) | C |
Typical applications
Frequently asked
[ 02 ] Other grades in Nickel Alloys
Inconel 625
Mill indentNickel-chromium-molybdenum alloy strengthened by niobium. Exceptional strength and corrosion resistance from cryogenic temperatures to 980 C without heat treatment.
Inconel 600
Mill indentSolid solution nickel-chromium-iron alloy with high resistance to oxidation, carburisation and chloride ion stress corrosion cracking at elevated temperature.
Monel 400
Mill indentNickel-copper alloy with outstanding resistance to flowing seawater, hydrofluoric acid and alkalis, and total immunity to chloride stress corrosion cracking.
Hastelloy C276
Mill indentNickel-molybdenum-chromium alloy with tungsten, regarded as the most universally corrosion resistant alloy available for both oxidising and reducing media.
Alloy 800 (Incoloy 800)
Mill indentIron-nickel-chromium alloy for high temperature strength with oxidation and carburisation resistance. The 32Ni-21Cr balance resists chloride stress corrosion cracking that austenitic stainless suffers, which is why it is standard for process heater and reformer tubing.
Alloy 825 (Incoloy 825)
Mill indentNickel-iron-chromium with molybdenum, copper and titanium. The combination handles both reducing and oxidising acids and resists chloride stress corrosion cracking and sour well fluids, making 825 the standard CRA for sour service tubulars, cladding and acid plant.