AL 800H™ Nickel-Base Alloy, UNS N08810,DIN 1.4876; 1

### **Product Datasheet: AL 800H™ / INCOLOY® 800H (UNS N08810)** **A Nickel-Iron-Chromium Alloy for High-Temperature Applications** --- #### **1. Overview** **AL 800H™**, commercially known as **INCOLOY® 800H**, is a nickel-iron-chromium alloy designed for optimal performance in high-temperature environments. The alloy is stabilized with titanium and aluminum to control grain growth and provide excellent creep and rupture properties at temperatures above 540°C (1000°F). This alloy exhibits outstanding resistance to oxidation, carburization, and sulfidation, making it particularly suitable for prolonged service in demanding thermal processing applications. Its controlled carbon content and optimized grain structure ensure consistent mechanical properties under sustained high-temperature exposure. --- #### **2. Chemical Composition (Typical Weight %)** | Element | Content (%) | Role in the Alloy | | | --- | --- | | **Nickel (Ni)** | ~30.0-35.0 | Provides matrix stability and corrosion resistance | | **Chromium (Cr)** | ~19.0-23.0 | Confers oxidation and corrosion resistance | | **Iron (Fe)** | Balance (~39.5) | Forms the primary alloy matrix | | **Carbon (C)** | ~0.05-0.10 | Controlled for optimal high-temperature strength | | **Aluminum (Al)** | ~0.15-0.60 | Stabilizing element for high-temperature performance | | **Titanium (Ti)** | ~0.15-0.60 | Stabilizing element, controls grain growth | | **Manganese (Mn)** | ≤ 1.50 | Residual element | | **Copper (Cu)** | ≤ 0.75 | Residual element | | **Silicon (Si)** | ≤ 1.00 | Residual element | | **Sulfur (S)** | ≤ 0.015 | Controlled impurity | --- #### **3. Physical Properties (Typical)** | Property | Value / Condition | | | --- | | **Density** | 7.94 g/cm³ (0.286 lb/in³) | | **Melting Range** | 1350-1400 °C (2460-2550 °F) | | **Thermal Expansion Coefficient** | 14.4 μm/m·°C (20-1000°C) | | **Thermal Conductivity** | 11.2 W/m·K (at 100°C) | | **Modulus of Elasticity** | 196 GPa (28.4×10⁶ psi) | | **Electrical Resistivity** | 0.99 μΩ·m | | **Specific Heat** | 500 J/kg·K (at 20°C) | --- #### **4. Mechanical Properties (Annealed Condition)** **Room Temperature Properties:** * **Tensile Strength**: 450-620 MPa (65-90 ksi) * **Yield Strength (0.2% Offset)**: 170-345 MPa (25-50 ksi) * **Elongation**: 30-45% **High-Temperature Performance:** * Excellent creep and rupture strength at 540-980°C (1000-1800°F) * Maintains structural integrity under prolonged high-temperature exposure * Good thermal fatigue resistance --- #### **5. Corrosion Resistance** AL 800H demonstrates superior performance in various demanding environments: * **High-Temperature Oxidation**: Excellent resistance to scaling and oxidation up to 1150°C (2100°F) * **Carburizing Atmospheres**: Superior resistance to carbon absorption in hydrocarbon environments * **Sulfidation Resistance**: Good performance in sulfur-containing atmospheres * **Nitriding Resistance**: Moderate resistance to nitriding environments * **Chloride Stress Corrosion**: Good resistance in chloride-containing media --- #### **6. Product Applications** **Heat Treatment Industry:** * Radiant tubes and furnace muffles * Heat treatment retorts and baskets * Roller hearth furnace components * Annealing covers and inner covers **Chemical Processing:** * Steam methane reformer tubes * Ethylene furnace components * Catalyst support grids * Pyrolysis tubing **Power Generation:** * Heat exchangers and superheaters * Steam generator tubing * Nuclear reactor core components * Thermal reactor systems **Other Applications:** * Petrochemical cracking furnaces * Waste incineration systems * Glass manufacturing equipment * Calciners and roasters --- #### **7. International Standards** * **UNS**: N08810 * **DIN/Werkstoff Nr.**: 1.4876 * **ASTM/ASME Specifications**: * **ASTM B-409 / ASME SB-409**: Plate, Sheet, and Strip * **ASTM B407**: Pipe and Tube * **ASTM B408**: Rod and Bar * **Aerospace Material Specification**: * **AMS 5871**: Sheet, Strip, and Plate * **Additional Certifications**: * ASME Boiler and Pressure Vessel Code Case N-201 * ISO 6208 for wrought nickel alloys * Various European pressure equipment directives * Nuclear applications certifications --- **Technical Note:** The information provided represents typical values and characteristics. Actual properties may vary based on manufacturing processes, heat treatment, and specific product form. For critical applications requiring ASME code compliance, ensure material meets the specific requirements of SB-409 and relevant code cases. *INCOLOY is a registered trademark of Special Metals Corporation. AL 800H is understood to be a related trademark for this alloy composition.*

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 3384 gallon liquid totes Special package is available on request.