Alloy N,Hastelloy N,UNS N10003，EFORU

### **Alloy N / Hastelloy® N (UNS N10003) - Technical Datasheet** --- #### **1. Overview** **Hastelloy® N** (UNS N10003) is a nickel-chromium-molybdenum alloy specifically developed for exceptional performance in high-temperature molten fluoride salt environments. Originally created for the Molten Salt Reactor Experiment (MSRE) program, this alloy demonstrates outstanding resistance to fluoride salts, fluorine, and hydrofluoric acid, while maintaining excellent mechanical properties at elevated temperatures. Its unique combination of properties makes it indispensable for advanced nuclear and chemical processing applications. --- #### **2. Chemical Composition (Weight %)** The composition is optimized for molten fluoride salt compatibility. | Element | Content (%) | Role & Benefit | |---------|-------------|----------------| | **Nickel (Ni)** | 67.0 - 72.0 | Base element providing high-temperature strength and corrosion resistance | | **Chromium (Cr)** | 6.0 - 8.0 | Enhances oxidation resistance and high-temperature stability | | **Molybdenum (Mo)** | 15.0 - 18.0 | Provides solid solution strengthening and corrosion resistance | | **Iron (Fe)** | 5.0 max | Controlled residual element | | **Cobalt (Co)** | 0.20 max | Minimized for nuclear applications | | **Manganese (Mn)** | 0.80 - 1.50 | Deoxidizer and sulfur control | | **Silicon (Si)** | 1.0 max | Deoxidizer and fluidity agent | | **Aluminum (Al)** | 0.50 max | Controlled for optimal welding characteristics | | **Copper (Cu)** | 0.35 max | Controlled impurity | | **Carbon (C)** | 0.04 - 0.08 | Controlled for optimal strength and fabricability | | **Sulfur (S)** | 0.025 max | Tightly controlled impurity | *Note: "Hastelloy" is a registered trademark of Haynes International Inc.* --- #### **3. Physical Properties** The physical properties support high-temperature nuclear applications. | Property | Value | |----------|-------| | **Density** | 8.86 g/cm³ (0.320 lb/in³) | | **Melting Point** | 1330-1360°C (2425-2480°F) | | **Specific Heat (20°C)** | 448 J/kg·K | | **Thermal Conductivity** | 14.0 W/m·K (at 20°C) | | **Mean Coefficient of Thermal Expansion** | 12.3 × 10⁻⁶/°C (20-300°C) | | **Electrical Resistivity** | 1.20 μΩ·m | | **Modulus of Elasticity** | 214 GPa (31.0 × 10⁶ psi) | | **Magnetic Permeability** | Essentially non-magnetic | --- #### **4. Mechanical Properties** The alloy maintains excellent mechanical properties at elevated temperatures. **Room Temperature (Annealed):** | Property | Value | |----------|-------| | **Tensile Strength** | 690-860 MPa (100-125 ksi) | | **Yield Strength (0.2% Offset)** | 310-485 MPa (45-70 ksi) | | **Elongation** | 35-50% | | **Hardness** | 85-100 HRB | **Elevated Temperature Properties (650°C/1200°F):** | Property | Value | |----------|-------| | **Tensile Strength** | 485 MPa (70 ksi) | | **Yield Strength** | 275 MPa (40 ksi) | | **Creep Rupture Strength (1000h)** | 110 MPa (16 ksi) | --- #### **5. Product Applications** **Hastelloy N** serves in specialized high-temperature corrosive environments: - **Nuclear Industry:** - Molten salt reactor components - Heat exchangers for fluoride salts - Reactor vessel internals - Nuclear fuel processing equipment - **Chemical Processing:** - Fluorination process equipment - Hydrofluoric acid production - Fluorochemical manufacturing - High-temperature acid service - **Aerospace Industry:** - Rocket engine components - High-temperature fasteners - Turbine components - Exhaust system parts - **Research and Development:** - Advanced nuclear system prototypes - High-temperature test facilities - Material science research equipment - **Industrial Applications:** - High-temperature heat treatment fixtures - Chemical vapor deposition apparatus - Semiconductor processing equipment --- #### **6. International Standards** The material conforms to various international specifications: | Standard | Specification | |----------|---------------| | **ASTM** | ASTM B366 - Factory-Made Wrought Fittings
ASTM B435 - UNS N10003 Plate, Sheet, and Strip
ASTM B572 - UNS N10003 Rod | | **UNS** | UNS N10003 | | **ASME** | SB-435, SB-572 | | **Nuclear Standards** | ASTM A1024 - Nuclear Grade Alloy N | | **Aerospace** | AMS 5599 | --- #### **7. Corrosion Resistance** - **Exceptional** resistance to molten fluoride salts - **Outstanding** performance in fluorine and fluoride environments - **Excellent** resistance to hydrofluoric acid - **Good** oxidation resistance up to 1175°C (2150°F) - **Superior** performance in high-temperature air and steam - **Good** resistance to sulfuric and phosphoric acids --- #### **8. Fabrication Characteristics** - **Machining:** Similar to other nickel-based superalloys - **Welding:** Excellent weldability using GTAW with matching filler metal - **Forming:** Good hot working characteristics - **Heat Treatment:** Solution anneal at 1150-1200°C (2100-2190°F) - **Aging:** Can be aged for optimal properties at 700-800°C (1290-1470°F) --- #### **9. Special Considerations** - **Nuclear Applications:** Low cobalt content for reduced activation - **High-Temperature Stability:** Resistant to thermal aging embrittlement - **Molten Salt Compatibility:** Specifically designed for fluoride salt environments - **Radiation Resistance:** Good performance in nuclear radiation environments - **Temperature Limits:** Suitable for continuous service up to 900°C (1650°F) --- #### **10. Summary** **Hastelloy® N (UNS N10003)** represents a specialized nickel-chromium-molybdenum alloy engineered specifically for extreme high-temperature applications involving molten fluoride salts and other aggressive fluoride environments. Its unique combination of high-temperature strength, exceptional corrosion resistance in fluoride media, and good fabricability makes it the material of choice for advanced nuclear systems, particularly molten salt reactors. The alloy's proven performance in the Molten Salt Reactor Experiment and subsequent research programs demonstrates its reliability in the most demanding high-temperature nuclear applications. Governed by comprehensive international standards including ASTM B435 and nuclear-specific specifications, Hastelloy N continues to enable technological advances in nuclear energy, aerospace, and high-temperature chemical processing industries.

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 1718 gallon liquid totes Special package is available on request.