Incoloy 800H Round Bar (UNS N08810 / W.Nr. 1.4958)
Incoloy 800H Round Bar is a high-carbon, solid-solution strengthened nickel–iron–chromium alloy designed for enhanced creep and rupture strength at elevated temperatures. Compared to Incoloy 800, grade 800H offers superior performance in long-term high-temperature service, making it ideal for petrochemical, power generation, and heat-treating applications.
Key Features
- Excellent creep and stress-rupture strength
- Superior oxidation and carburization resistance
- Stable austenitic structure at high temperatures
- Improved high-temperature performance over Incoloy 800
- Good resistance to thermal fatigue
- Excellent weldability and fabrication characteristics
Equivalent Grades
| Standard | Equivalent |
|---|---|
| UNS | N08810 |
| DIN / EN | 1.4958 |
| ASTM | Incoloy 800H |
Sizes
- Diameter: 6 mm to 350 mm
- Length: Random, Cut Length, or as per customer requirement
Incoloy 800H Chemical Composition
| Element | Percentage (%) |
|---|---|
| Nickel (Ni) | 30.0 – 35.0 |
| Chromium (Cr) | 19.0 – 23.0 |
| Iron (Fe) | Balance |
| Carbon (C) | 0.05 – 0.10 |
| Manganese (Mn) | ≤ 1.5 |
| Silicon (Si) | ≤ 1.0 |
| Aluminum (Al) | 0.15 – 0.60 |
| Titanium (Ti) | 0.15 – 0.60 |
UNS N08810 Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength | ≥ 450 MPa |
| Yield Strength (0.2%) | ≥ 170 MPa |
| Elongation | ≥ 30% |
| Hardness | ≤ 90 HRB |
W.Nr. 1.4958 Physical Properties
| Property | Value |
|---|---|
| Density | 7.94 g/cm³ |
| Melting Range | 1357 – 1385 °C |
| Modulus of Elasticity | 196 GPa |
| Thermal Conductivity | 11.5 W/m·K |
Types of Incoloy 800H Round Bar
- Hot Rolled Round Bar
- Cold Drawn Round Bar
- Forged Round Bar
- Precision Machined Bar
Applications
- Petrochemical cracking and reforming units
- Heat exchangers and superheaters
- Furnace components and radiant tubes
- Power generation equipment
- Chemical processing plants
- Industrial heat-treating fixtures
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