AL 825™ Nickel Alloy,AL 825 alloy，1

### **Product Datasheet: AL 825™ / INCOLOY® 825 (UNS N08825)** **A Nickel-Iron-Chromium Alloy for Aggressive Corrosive Environments** --- #### **1. Overview** **AL 825™**, commercially known as **INCOLOY® 825**, is a nickel-iron-chromium alloy with additions of molybdenum and copper. The alloy is stabilized with titanium to provide excellent resistance to a wide variety of corrosive environments, particularly sulfuric and phosphoric acids, and seawater. This alloy is designed to handle both oxidizing and reducing conditions, offering superior performance in acidic and alkaline environments. Its balanced composition ensures outstanding resistance to stress corrosion cracking, pitting, and crevice corrosion, making it particularly suitable for chemical processing, pollution control, and marine applications. --- #### **2. Chemical Composition (Typical Weight %)** | Element | Content (%) | Role in the Alloy | |---------|-------------|-------------------| | **Nickel (Ni)** | ~38.0-46.0 | Provides fundamental corrosion resistance | | **Chromium (Cr)** | ~19.5-23.5 | Confers resistance to oxidizing environments | | **Iron (Fe)** | ~22.0 min | Base element of the alloy matrix | | **Molybdenum (Mo)** | ~2.5-3.5 | Enhances resistance to reducing acids | | **Copper (Cu)** | ~1.5-3.0 | Provides resistance to sulfuric acid | | **Titanium (Ti)** | ~0.6-1.2 | Stabilizes against sensitization | | **Carbon (C)** | ≤ 0.05 | Controlled for optimal performance | | **Manganese (Mn)** | ≤ 1.0 | Residual element | | **Silicon (Si)** | ≤ 0.5 | Residual element | --- #### **3. Physical Properties (Typical)** | Property | Value / Condition | |----------|-------------------| | **Density** | 8.14 g/cm³ (0.294 lb/in³) | | **Melting Range** | 1370-1400 °C (2500-2550 °F) | | **Thermal Expansion Coefficient** | 14.0 μm/m·°C (20-100°C) | | **Thermal Conductivity** | 10.8 W/m·K (at 100°C) | | **Modulus of Elasticity** | 196 GPa (28.4×10⁶ psi) | | **Electrical Resistivity** | 1.12 μΩ·m | --- #### **4. Mechanical Properties (Annealed Condition)** **Room Temperature Properties:** * **Tensile Strength**: 586 MPa (85 ksi) min * **Yield Strength (0.2% Offset)**: 241 MPa (35 ksi) min * **Elongation**: 30% min **High-Temperature Performance:** * Maintains good mechanical properties up to 540°C (1000°F) * Excellent creep and stress-rupture properties --- #### **5. Corrosion Resistance** AL 825 demonstrates exceptional performance in various corrosive environments: * **Sulfuric Acid Solutions**: Excellent resistance across wide concentration ranges * **Phosphoric Acid**: Outstanding performance in both pure and impure acids * **Seawater and Brine Solutions**: Superior resistance to chloride-induced corrosion * **Stress Corrosion Cracking**: Highly resistant in chloride-containing environments * **Oxidizing Salts**: Good resistance to nitrate and other oxidizing salt solutions --- #### **6. Product Applications** **Chemical Processing Industry:** * Sulfuric acid pickling tanks and heating coils * Phosphoric acid evaporators and reactors * Chemical processing vessels and piping systems * Acid production equipment **Oil and Gas Industry:** * Downhole tubing strings * Well completion components * Production piping systems * Sour service applications **Pollution Control:** * Flue gas desulfurization systems * Scrubbers and absorbers * Waste water treatment equipment * Chemical waste processing units **Marine and Offshore:** * Seawater cooling systems * Marine piping and fittings * Offshore platform components * Desalination plant equipment --- #### **7. International Standards** * **UNS**: N08825 * **ASTM/ASME Specifications**: * **ASTM B424**: Plate, Sheet, and Strip * **ASTM B423**: Seamless Pipe and Tube * **ASTM B425**: Bar and Wire * **ASTM B163**: Seamless Condenser and Heat-Exchanger Tubes * **Additional Certifications**: * ASME Boiler and Pressure Vessel Code * NACE MR0175/ISO 15156 for sour service * ISO 6208 for wrought nickel alloys * Various European pressure equipment directives --- **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 825 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 3386 gallon liquid totes Special package is available on request.