Alloy 825,Incoloy 825 Fittings,UNS N08825,E FORU

British Specs:BS 3072 BS 3073 BS 3074 BS 3075 BS 3076 NA16，American Specs:ASTM B425 ASTM B424 ASTM B163 (Tube *)，German Specs:WS 2.4858

### **Technical Datasheet: Alloy 825 / Incoloy 825 Fittings / UNS N08825** --- #### **1. Overview** **Alloy 825** (commercially known as **Incoloy® 825**) is a nickel-iron-chromium alloy engineered with molybdenum and copper additions for exceptional corrosion resistance in aggressive environments. This datasheet specifically addresses **Fittings** made from this alloy, which are essential components in piping systems for directing, connecting, and controlling fluid flow in corrosive service. Incoloy 825 Fittings maintain the same excellent corrosion resistance as the base material while providing reliable performance in complex piping configurations. The designations **Alloy 825**, **Incoloy 825 Fittings**, and **UNS N08825** refer to corrosion-resistant piping components manufactured to standard dimensions for industrial applications. --- #### **2. Key Characteristics** * **Excellent Corrosion Resistance:** Superior performance in both oxidizing and reducing environments * **Outstanding Acid Resistance:** Exceptional resistance to sulfuric acid, phosphoric acid, and other reducing acids * **Superior Stress Corrosion Cracking Resistance:** Highly resistant to chloride-induced SCC * **Excellent Pitting and Crevice Corrosion Resistance:** Enhanced by molybdenum content * **Good Mechanical Strength:** Suitable for high-pressure applications * **Stabilized Against Sensitization:** Titanium addition prevents chromium carbide formation during welding --- #### **3. Chemical Composition (Weight %)** Incoloy 825 Fittings maintain the same chemical composition as the base alloy. | Element | Minimum (%) | Maximum (%) | Key Function | | :--- | :--- | :--- | :--- | | **Nickel (Ni)** | 38.0 | 46.0 | Provides fundamental corrosion resistance in reducing environments | | **Chromium (Cr)** | 19.5 | 23.5 | Confers resistance to oxidizing environments | | **Iron (Fe)** | 22.0 min | Balance | Base element of the alloy | | **Molybdenum (Mo)** | 2.5 | 3.5 | Enhances pitting and crevice corrosion resistance | | **Copper (Cu)** | 1.5 | 3.0 | Provides resistance to reducing acids, particularly sulfuric acid | | **Titanium (Ti)** | 0.6 | 1.2 | Stabilizes against sensitization by forming titanium carbides | | **Carbon (C)** | - | 0.05 | Kept low to minimize carbide formation | | **Manganese (Mn)** | - | 1.00 | - | | **Sulfur (S)** | - | 0.03 | - | | **Silicon (Si)** | - | 0.05 | - | --- #### **4. Physical Properties (Typical)** | Property | Value | | :--- | :--- | | **Density** | 8.14 g/cm³ (0.294 lb/in³) | | **Melting Range** | 1370 - 1400 °C (2500 - 2550 °F) | | **Specific Heat (20°C)** | 440 J/kg·K | | **Thermal Conductivity** | 10.8 W/m·K (at 100°C) | | **Mean Coefficient of Thermal Expansion** | 14.0 μm/m·K (20 - 100°C) | | **Modulus of Elasticity** | 196 GPa (28.4 x 10⁶ psi) | --- #### **5. Mechanical Properties (Typical)** * **Tensile Strength:** 655 MPa (95 ksi) min * **Yield Strength (0.2% Offset):** 275 MPa (40 ksi) min * **Elongation:** 30% min * **Hardness:** HB 190 max --- #### **6. International Standards & Specifications** **Fittings Standards:** * **ASTM B366 / ASME SB366:** Factory-Made Wrought Nickel and Nickel Alloy Fittings * **ASME B16.9:** Factory-Made Wrought Buttwelding Fittings * **ASME B16.11:** Forged Steel Fittings, Socket-Welding and Threaded * **ASME B16.28:** Wrought Steel Buttwelding Short Radius Elbows and Returns **Material Standards:** * **ASTM B564 / ASME SB564:** Nickel Alloy Forgings (for forged fittings) * **ASTM B366 / ASME SB366:** Wrought Nickel and Nickel Alloy Fittings **Pressure Ratings:** * **ASME B16.5:** Pipe Flanges and Flanged Fittings * **ASME B16.34:** Valves - Flanged, Threaded, and Welding End **General Material Standards:** * **UNS:** N08825 * **EN:** 2.4858 (NiCr21Mo) * **DIN:** 2.4858 --- #### **7. Types of Fittings Available** **Butt-Weld Fittings:** * Elbows (45°, 90°, 180°) * Tees (Equal and Reducing) * Reducers (Concentric and Eccentric) * Caps and Stub Ends **Socket-Weld Fittings:** * Socket-Weld Elbows * Socket-Weld Tees * Socket-Weld Couplings * Socket-Weld Caps **Threaded Fittings:** * Threaded Elbows * Threaded Tees * Threaded Couplings * Threaded Unions **Special Fittings:** * Lap Joint Stub Ends * Nipples * Crosses * Returns --- #### **8. Applications** **Chemical Processing Industry:** * Acid transfer and processing systems * Chemical reactor piping systems * Pickling line piping components * Chemical injection systems **Oil & Gas Industry:** * Offshore platform piping systems * Refinery process piping * Sour gas service (H₂S environments) * Seawater injection systems **Pollution Control Systems:** * Flue gas desulfurization (FGD) systems * Scrubber piping networks * Waste acid handling systems * Environmental treatment plants **Marine Applications:** * Seawater cooling systems * Ballast water piping * Marine exhaust systems * Offshore piping installations **Other Applications:** * Pharmaceutical processing systems * Pulp and paper industry * Nuclear fuel processing * Industrial waste treatment --- #### **9. Fabrication and Installation Notes** * **Welding Procedures:** Use AWS A5.14 ERNiFeCr-3 filler metal * **Heat Treatment:** Solution anneal at 900-980°C (1650-1800°F) if required after forming * **Installation:** Follow standard piping practices with proper alignment * **Pressure Testing:** Suitable for standard hydrostatic and pneumatic testing * **Compatibility:** Ensure compatibility with connected piping materials --- **Disclaimer:** This technical information is for reference purposes. For critical applications, always consult the specific material certification and the latest version of the relevant standards. Actual properties and available fitting types may vary by manufacturer.

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 1944 gallon liquid totes Special package is available on request.