Incoloy 800 Series (High-Temp Stability) – Exotic Metals LLP
This series is the industry standard for equipment that
must retain its structural integrity during prolonged exposure to high temperatures.
It is available in three distinct refinements:
Incoloy 800 Series
- Incoloy 800 (N08800): The general-purpose grade for service up to 600°C
- Incoloy 800H (N08810): Controlled carbon (0.05–0.10%) and solution annealing for
better creep and rupture strength above 600°C
- Incoloy 800HT (N08811): Further restricted Al + Ti content (0.85–1.20%) for maximum
performance in extreme heat (up to 925°C)
Mechanical Properties (Annealed)
| Property |
Metric Value |
Imperial Value |
| Tensile Strength |
≥ 520 MPa |
75 ksi |
| Yield Strength |
≥ 205 MPa |
30 ksi |
| Density |
7.94 g/cm³ |
0.287 lb/in³ |
Incoloy 825 (Aqueous Corrosion Specialist)
Incoloy 825 (UNS N08825) is a "workhorse" alloy for
chemical processing. The addition of Copper and Molybdenum makes it exceptionally
resistant to reducing acids, particularly sulfuric and phosphoric acids.
Typical Applications
- Oil & Gas: Downhole tubing, well-head components, and offshore piping
- Chemical: Pickling tank heaters, agitators, and acid production systems
- Marine: Propeller shafts and seawater-cooled heat exchangers
Incoloy 925 (High-Strength Oilfield Grade)
Incoloy 925 (UNS N09925) is essentially an age-hardenable
version of 825. It maintains the same level of corrosion resistance but adds
Titanium and Aluminum to allow for precipitation hardening.
Key Advantages
- Strength Advantage: It provides up to 3–4 times the yield strength of Incoloy 825
- Sour Service: Fully approved for NACE MR0175 for use in "sour" (H₂S-containing) oil
and gas wells
- Common Products: High-strength fasteners, tool joints, and valve stems
Technical Comparison & Size Ranges
| Grade |
Ni |
Fe |
Cr |
Mo |
Cu |
Ti |
| 800 |
30.0–35.0 |
39.5 Min |
19.0–23.0 |
— |
— |
0.15–0.60 |
| 825 |
38.0–46.0 |
22.0 Min |
19.5–23.5 |
2.5–3.5 |
1.5–3.0 |
0.60–1.20 |
| 925 |
42.0–46.0 |
22.0 Min |
19.5–22.5 |
2.5–3.5 |
1.5–3.0 |
1.90–2.40 |
