Alloy 825,Incoloy 825 Other/Similar Specs,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 - Other/Similar Specifications / UNS N08825** --- #### **1. Overview** **Alloy 825** (commercially known as **Incoloy® 825**) is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium, offering exceptional corrosion resistance in various aggressive environments. This datasheet covers alternative and similar international specifications for Alloy 825, providing engineers and procurement specialists with comprehensive cross-reference information for global projects and equivalent material selection. The designations **Alloy 825**, **Incoloy 825**, and **UNS N08825** are complemented by numerous international standards that specify equivalent or similar materials for various applications and regions. --- #### **2. Key Characteristics** * **Excellent General Corrosion Resistance:** Outstanding performance in both oxidizing and reducing environments * **Superior Acid Resistance:** Exceptional resistance to sulfuric acid, phosphoric acid, and other reducing acids * **Excellent Stress Corrosion Cracking (SCC) Resistance:** Highly resistant to chloride-induced SCC * **Pitting and Crevice Corrosion Resistance:** Enhanced by molybdenum content (2.5-3.5%) * **Good Mechanical Properties and Fabricability:** Suitable for various manufacturing processes * **Stabilized Against Sensitization:** Titanium addition prevents chromium carbide formation --- #### **3. Chemical Composition (Weight %) - Base Requirements** | Element | UNS N08825 | EN 2.4858 | DIN 2.4858 | GOST | | :--- | :--- | :--- | :--- | :--- | | **Nickel (Ni)** | 38.0-46.0 | 38.0-46.0 | 38.0-46.0 | 38.0-46.0 | | **Chromium (Cr)** | 19.5-23.5 | 19.5-23.5 | 19.5-23.5 | 19.5-23.5 | | **Iron (Fe)** | 22.0 min | 22.0 min | 22.0 min | 22.0 min | | **Molybdenum (Mo)** | 2.5-3.5 | 2.5-3.5 | 2.5-3.5 | 2.5-3.5 | | **Copper (Cu)** | 1.5-3.0 | 1.5-3.0 | 1.5-3.0 | 1.5-3.0 | | **Titanium (Ti)** | 0.6-1.2 | 0.6-1.2 | 0.6-1.2 | 0.6-1.2 | | **Carbon (C)** | 0.05 max | 0.05 max | 0.05 max | 0.05 max | --- #### **4. Physical Properties (Typical)** | Property | Value | Metric | Imperial | | :--- | :--- | :--- | :--- | | **Density** | 8.14 g/cm³ | 8140 kg/m³ | 0.294 lb/in³ | | **Melting Range** | 1370-1400°C | - | 2500-2550°F | | **Specific Heat** | 440 J/kg·K | - | 0.105 BTU/lb·°F | | **Thermal Conductivity** | 10.8 W/m·K | - | 62.4 BTU·in/hr·ft²·°F | | **Thermal Expansion** | 14.0 μm/m·K | - | 7.8 μin/in·°F | | **Electrical Resistivity** | 1.12 μΩ·m | - | 425 ohm·circ mil/ft | | **Modulus of Elasticity** | 196 GPa | - | 28.4×10⁶ psi | --- #### **5. Mechanical Properties (Typical for Annealed Condition)** | Property | ASTM Standard | Typical Value | | :--- | :--- | :--- | | **Tensile Strength** | B424 | 655 MPa (95 ksi) min | | **Yield Strength** | B424 | 275 MPa (40 ksi) min | | **Elongation** | B424 | 30% min | | **Hardness** | B424 | Rb 90 max | --- #### **6. International Standards & Cross-References** **North American Standards:** * **UNS:** N08825 * **ASTM:** B424, B423, B163, B704, B425, B564 * **ASME:** SB424, SB423, SB163, SB704, SB425, SB564 * **AWS:** A5.14 ERNiFeCr-3, A5.11 ENiFeCr-3 * **AMS:** 5871 **European Standards:** * **EN:** 2.4858 (NiCr21Mo) * **DIN:** 2.4858 * **AFNOR:** NC21FeDu * **UNI:** NICU 30-32 * **SS:** 835102 **Asian and Other Standards:** * **JIS:** NCF 825 * **GOST:** ХН38ВТ (Russian equivalent) * **GB:** NS142 (Chinese equivalent) * **ISO:** 6207 (Nickel alloy plate, sheet, strip) --- #### **7. Product Forms and Specifications** **Plate, Sheet & Strip:** * **ASTM B424 / ASME SB424** * **EN 10095** * **DIN 17752** **Tubular Products:** * **ASTM B423 / ASME SB423** (Seamless Pipe) * **ASTM B163 / ASME SB163** (Seamless Tube) * **ASTM B704/B705** (Welded Tube) * **DIN 17459** **Bar and Wire:** * **ASTM B425 / ASME SB425** * **DIN 17750** **Forgings and Fittings:** * **ASTM B564 / ASME SB564** (Forgings) * **ASTM B366 / ASME SB366** (Fittings) --- #### **8. Applications by Industry** **Chemical Processing:** * Acid production equipment * Pickling tank components * Chemical reactors and vessels * Heat exchangers and condensers **Oil & Gas:** * Downhole tubing * Wellhead components * Process piping * Sour service equipment **Marine and Offshore:** * Seawater cooling systems * Ballast water piping * Offshore platform components * Marine exhaust systems **Pollution Control:** * Flue gas desulfurization systems * Scrubbers and absorbers * Waste treatment equipment * Incinerator components **Other Industries:** * Nuclear fuel reprocessing * Pharmaceutical equipment * Pulp and paper industry * Food processing equipment --- #### **9. Important Notes on Equivalency** * **Regional Variations:** While chemical compositions are generally similar, minor variations may exist in impurity elements and processing requirements * **Testing Requirements:** Different standards may specify varying testing methods and acceptance criteria * **Certification:** Always verify material certifications against the specific project requirements * **Technical Approval:** Consult with materials engineers when substituting materials between different standards * **Manufacturing Processes:** Some specifications may be product-form specific with unique manufacturing requirements --- #### **10. Quality Assurance** * **Certification:** Mill certificates per EN 10204 3.1/3.2 or equivalent * **Traceability:** Full material traceability from melt to final product * **Testing:** Chemical analysis, mechanical testing, and NDT as required by specification * **Documentation:** Complete documentation package including material test reports --- **Disclaimer:** This cross-reference information is provided for guidance only. While every effort has been made to ensure accuracy, specifications are subject to change. Always consult the latest edition of the relevant standards and work with qualified materials engineers for critical applications.

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 1946 gallon liquid totes Special package is available on request.