Alloy 260， ，UNS N03260,E FORU

British Specs:，American Specs: AMS 5890 Bar and Forgings，German Specs:

**Product Datasheet: Alloy 260 / UNS N03260** **Alloy 260** (UNS N03260) is a nickel-chromium-iron-molybdenum-copper alloy designed to offer excellent corrosion resistance in a wide range of aggressive media, including sulfuric acid, phosphoric acid, and other oxidizing and reducing environments. This versatile alloy maintains good structural stability and mechanical properties at elevated temperatures, making it suitable for various demanding industrial applications. --- ### **1. Chemical Composition (Typical % by Weight)** | Element | Content (%) | Element | Content (%) | |---------|-------------|---------|-------------| | **Nickel (Ni)** | **Balance** | **Copper (Cu)** | **1.5-2.5** | | **Chromium (Cr)** | **19.0-21.0** | **Titanium (Ti)** | **0.6-1.2** | | **Iron (Fe)** | **18.0-21.0** | **Manganese (Mn)** | **≤1.5** | | **Molybdenum (Mo)** | **5.5-6.5** | **Silicon (Si)** | **≤0.5** | | **Carbon (C)** | **≤0.05** | **Sulfur (S)** | **≤0.015** | --- ### **2. Physical & Mechanical Properties** **Physical Properties:** - **Density:** 8.25 g/cm³ (0.298 lb/in³) - **Melting Point:** 1370-1400°C (2500-2550°F) - **Thermal Conductivity:** 12.5 W/m·K (at 100°C) - **Electrical Resistivity:** 1.10 μΩ·m - **Mean Coefficient of Thermal Expansion:** 14.5 × 10⁻⁶/K (20-100°C) - **Modulus of Elasticity:** 200 GPa (29 × 10⁶ psi) **Mechanical Properties (Annealed Condition):** - **Tensile Strength:** 620-760 MPa (90-110 ksi) - **Yield Strength (0.2% Offset):** 275-345 MPa (40-50 ksi) - **Elongation (% in 2 inches):** 40-50% - **Hardness (Rockwell B):** 80-95 HRB - **Impact Strength (Charpy V-notch):** 100-150 J (74-110 ft-lb) --- ### **3. Product Applications** **Chemical Processing Industry:** - Sulfuric acid production equipment - Phosphoric acid evaporators and heat exchangers - Pickling tank components and heating coils - Chemical reactors and pressure vessels **Pollution Control Systems:** - Flue gas desulfurization systems - Scrubbers and absorbers - Wastewater treatment equipment - Chimney linings and ductwork **Pulp and Paper Industry:** - Digester vessels and components - Bleach plant equipment - Chemical recovery systems **Oil and Gas:** - Downhole components - Production tubing - Heat exchangers in refining **Other Applications:** - Acid production facilities - Nuclear fuel processing - Industrial heating elements - Thermal processing equipment --- ### **4. International Standards & Specifications** | Standard | Material Number | UNS Number | Product Forms | |----------|-----------------|------------|---------------| | **ASTM B163** | - | **N03260** | Seamless Tubes | | **ASTM B164** | - | **N03260** | Rod and Bar | | **ASTM B165** | - | **N03260** | Pipe | | **ASTM B166** | - | **N03260** | Bar, Rod, and Wire | | **ASTM B168** | - | **N03260** | Plate, Sheet, and Strip | | **DIN 17744** | **2.4675** | **N03260** | Wrought Alloy | | **EN 10095** | **NiCr21Fe18Mo** | **N03260** | Heat Resisting Alloys | --- ### **5. Key Advantages** **Corrosion Resistance:** - Excellent resistance to sulfuric acid at various concentrations and temperatures - Good resistance to phosphoric acid and other mineral acids - Resists chloride-induced stress corrosion cracking - Performs well in both oxidizing and reducing environments **Mechanical Properties:** - Good strength and ductility at room and elevated temperatures - Excellent fatigue resistance - Good creep rupture strength - Maintains properties in long-term service **Fabrication Characteristics:** - Good weldability using matching filler metals - Can be formed using standard methods - Suitable for hot and cold working - Machinable with proper techniques --- ### **6. Technical Specifications** **Heat Treatment:** - **Annealing Temperature:** 980-1050°C (1800-1920°F) - **Quenching:** Rapid air or water quench - **Stress Relieving:** 540-650°C (1000-1200°F) **Welding Recommendations:** - **Filler Metal:** ENiCrFe-12 or equivalent - **Processes:** GTAW, GMAW, SMAW - **Preheating:** Not required - **Post-Weld Heat Treatment:** Generally not required **Design Considerations:** - Suitable for continuous service up to 650°C (1200°F) - Good thermal fatigue resistance - Low thermal expansion coefficient - Excellent structural stability --- **Conclusion:** Alloy 260 (UNS N03260) provides an optimal combination of corrosion resistance, mechanical strength, and fabrication characteristics for demanding industrial applications. Its versatility in handling both oxidizing and reducing environments, coupled with good elevated temperature performance, makes it a preferred choice for chemical processing, pollution control, and other aggressive service conditions. --- **For detailed technical data, size availability, and application-specific recommendations, please contact our technical services department.**

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 2807 gallon liquid totes Special package is available on request.