Incoloy 800HT Round Bar (UNS N08811 / W.Nr. 1.4959)
Incoloy 800HT Round Bar is an enhanced, high-temperature grade of the Incoloy 800 series, developed with controlled carbon and increased aluminum–titanium content for superior creep and stress-rupture strength. It delivers excellent oxidation, carburization, and nitriding resistance in prolonged high-temperature service, making it ideal for demanding industrial and petrochemical applications.
Key Features
- Superior creep and stress-rupture strength at high temperatures
- Excellent oxidation and carburization resistance
- Enhanced resistance to nitriding environments
- Stable austenitic microstructure
- Improved high-temperature performance over 800 & 800H
- Good weldability and fabrication properties
Equivalent Grades
| Standard | Equivalent |
|---|---|
| UNS | N08811 |
| DIN / EN | 1.4959 |
| ASTM | Incoloy 800HT |
Sizes of Incoloy 800HT Round Bar
- Diameter: 6 mm to 350 mm
- Length: Random, Cut Length, or as per customer requirement
Incoloy 800HT Chemical Composition
| Element | Percentage (%) |
|---|---|
| Nickel (Ni) | 30.0 – 35.0 |
| Chromium (Cr) | 19.0 – 23.0 |
| Iron (Fe) | Balance |
| Carbon (C) | 0.06 – 0.10 |
| Aluminum (Al) | 0.25 – 0.60 |
| Titanium (Ti) | 0.25 – 0.60 |
| Manganese (Mn) | ≤ 1.5 |
| Silicon (Si) | ≤ 1.0 |
UNS N08811 Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength | ≥ 450 MPa |
| Yield Strength (0.2%) | ≥ 170 MPa |
| Elongation | ≥ 30% |
| Hardness | ≤ 90 HRB |
W.Nr. 1.4959 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 Round Bar
- Hot Rolled Round Bar
- Cold Drawn Round Bar
- Forged Round Bar
- Precision Machined Bar
Applications
- Petrochemical reformers and crackers
- Furnace components and radiant tubes
- Heat exchangers and superheaters
- Power generation equipment
- Nitriding and carburizing furnaces
- Chemical processing equipment
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