Alloy 825,Incoloy 825 Forgings,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 Forgings / 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 **Forgings** made from this alloy, which are manufactured through controlled deformation processes to achieve superior mechanical properties and structural integrity. Incoloy 825 Forgings are characterized by their directional grain flow, improved toughness, and enhanced resistance to fatigue and impact loading, making them ideal for critical components in demanding applications. The designations **Alloy 825**, **Incoloy 825 Forgings**, and **UNS N08825** refer to forged components that maintain the same excellent corrosion resistance as the base material while offering improved mechanical properties through the forging process. --- #### **2. Key Characteristics** * **Enhanced Mechanical Properties:** Superior strength, toughness, and fatigue resistance compared to cast or wrought products * **Directional Strength:** Optimized grain flow pattern following component contours * **Excellent Corrosion Resistance:** Maintains base alloy corrosion resistance in aggressive environments * **Reduced Porosity and Defects:** Dense, homogeneous microstructure free from voids and inclusions * **Superior Structural Integrity:** Reliable performance in critical applications * **Good Machinability:** Can be precision machined to tight tolerances --- #### **3. Chemical Composition (Weight %)** Incoloy 825 Forgings 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) | | **Forging Temperature Range** | 950 - 1175°C (1740 - 2150°F) | --- #### **5. Mechanical Properties (Typical for Annealed Forgings)** * **Tensile Strength:** 655-795 MPa (95-115 ksi) * **Yield Strength (0.2% Offset):** 275-415 MPa (40-60 ksi) * **Elongation:** 30% min * **Reduction of Area:** 50% min * **Hardness:** HB 170-220 * **Impact Strength:** 100 J (74 ft-lb) min --- #### **6. International Standards & Specifications** **Forging Standards:** * **ASTM B564 / ASME SB564:** Standard Specification for Nickel Alloy Forgings * **ASTM B366 / ASME SB366:** Factory-Made Wrought Nickel and Nickel Alloy Fittings * **AMS 5871:** Aerospace Material Specification **Quality Standards:** * **ASME Section III:** Nuclear Facility Applications * **ASME Section VIII:** Pressure Vessel Applications * **ISO 9001:** Quality Management Systems * **NAVSEA:** Naval Applications **Testing Standards:** * **ASTM A388:** Ultrasonic Examination * **ASTM E165:** Liquid Penetrant Examination * **ASTM E709:** Magnetic Particle Examination --- #### **7. Manufacturing Processes** **Forging Methods:** * **Open-Die Forging:** For large, simple shapes * **Closed-Die Forging:** For complex, precision components * **Ring Rolling:** For circular components * **Press Forging:** For controlled deformation **Heat Treatment:** * **Solution Annealing:** 900-980°C (1650-1800°F) followed by rapid cooling * **Stress Relieving:** When required for specific applications * **Quenching:** Water quenching for optimal corrosion resistance --- #### **8. Applications** **Oil & Gas Industry:** * Wellhead components (valve bodies, bonnets) * Christmas tree equipment * Downhole tool components * Offshore platform components **Chemical Processing:** * Pump casings and impellers * Valve bodies and stems * Reactor components * Mixer shafts and agitators **Power Generation:** * Turbine components * Pump bodies for nuclear applications * Heat exchanger components * Pressure vessel parts **Marine and Offshore:** * Propeller shafts * Marine valve components * Subsea equipment * Shipbuilding components **Aerospace and Defense:** * Engine components * Missile and rocket parts * Military vehicle components * Specialized fasteners --- #### **9. Quality Assurance** * **Certification:** Full traceability with material certifications * **Non-Destructive Testing:** UT, PT, MT, RT as required * **Dimensional Inspection:** CMM and conventional methods * **Metallurgical Testing:** Grain size, microstructure analysis * **Mechanical Testing:** Tensile, impact, hardness testing --- **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 may vary depending on forging practices and heat treatment.

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 1945 gallon liquid totes Special package is available on request.