AL 800™ Nickel-Base Alloy, UNS N08800,DIN 1.4876; 1

### **Product Datasheet: AL 800™ / INCOLOY® 800 (UNS N08800)** **A Nickel-Iron-Chromium Alloy for High-Temperature Service** --- #### **1. Overview** **AL 800™**, commercially known as **INCOLOY® 800**, is a nickel-iron-chromium austenitic alloy designed for service in high-temperature environments. This alloy exhibits excellent strength and resistance to oxidation and carburization at elevated temperatures, along with good resistance to scaling and corrosion in various atmospheres. The alloy's balanced composition provides outstanding metallurgical stability through the addition of titanium and aluminum, which also help to stabilize the alloy against sensitization and intergranular corrosion. AL 800 maintains its properties under prolonged exposure to temperatures ranging from 540°C to 1100°C (1000°F to 2000°F). --- #### **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)** | ≤ 0.10 | 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:** * Good creep and stress-rupture properties at elevated temperatures * Maintains structural integrity under thermal cycling conditions * Excellent fatigue resistance at high temperatures --- #### **5. Corrosion Resistance** AL 800 demonstrates excellent performance in various corrosive environments: * **High-Temperature Oxidation**: Excellent resistance to scaling up to 1100°C (2000°F) * **Carburization Resistance**: Good resistance to carbon penetration in hydrocarbon environments * **Sulfidation Resistance**: Moderate to good performance in sulfur-containing atmospheres * **Chloride Stress Corrosion**: Good resistance in chloride-containing media * **Aqueous Corrosion**: Good resistance to nitric acid, phosphoric acid, and other chemicals --- #### **6. Product Applications** **Heat Treatment Industry:** * Heat treatment fixtures and baskets * Radiant tubes and furnace muffles * Retorts and annealing covers * Roller hearth furnace components **Chemical and Petrochemical:** * Steam hydrocarbon reformer tubing * Ethylene furnace components * Catalyst support grids * Heat exchanger tubing **Power Generation:** * Heat exchangers and superheaters * Steam generator tubing * Nuclear reactor components * Thermal energy storage systems **Other Applications:** * Food processing equipment * Pharmaceutical processing equipment * Pulp and paper digesters * Environmental protection equipment --- #### **7. International Standards** * **UNS**: N08800 * **DIN/Werkstoff Nr.**: 1.4876 * **ASTM/ASME Specifications**: * **ASTM B-409 / ASME SB-409**: Plate, Sheet, and Strip * **ASTM B407**: Seamless 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 * 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, consult the most recent edition of relevant material specifications and manufacturer's technical data. *INCOLOY is a registered trademark of Special Metals Corporation. AL 800 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 3385 gallon liquid totes Special package is available on request.