Hastelloy N alloy,UNS N10003, AMS 5607, AMS 5771，1

### **Hastelloy® N Alloy (UNS N10003) - Nickel-Molybdenum-Chromium High-Temperature Alloy** #### **Overview** **Hastelloy® N Alloy** is a nickel-molybdenum-chromium alloy specifically developed for exceptional performance in high-temperature environments up to 1200°C (2192°F), particularly in molten fluoride salt applications. Originally developed for nuclear reactor applications, this alloy exhibits outstanding resistance to oxidation and maintains excellent structural stability under prolonged exposure to extreme temperatures and aggressive chemical environments. --- #### **Chemical Composition (Weight %)** | Element | Content (%) | Function | |---------|-------------|-----------| | **Nickel (Ni)** | **Balance** | **Base element providing high-temperature stability** | | **Molybdenum (Mo)** | **15.0-18.0** | **Solid solution strengthening and creep resistance** | | **Chromium (Cr)** | **6.0-8.0** | **Oxidation resistance through protective scale formation** | | **Iron (Fe)** | **≤ 5.0** | **Controlled impurity** | | **Silicon (Si)** | **≤ 1.0** | **Controlled for high-temperature stability** | | **Manganese (Mn)** | **≤ 0.80** | **Deoxidizer** | | **Aluminum (Al)** | **≤ 0.50** | **Controlled impurity** | | **Cobalt (Co)** | **≤ 0.20** | **Controlled impurity** | | **Copper (Cu)** | **≤ 0.35** | **Controlled impurity** | | **Carbon (C)** | **0.04-0.08** | **Controlled for carbide stability** | | **Boron (B)** | **≤ 0.010** | **Grain boundary strengthening** | --- #### **Physical Properties** | Property | Value / Description | |----------|---------------------| | **Density** | **8.86 g/cm³ (0.320 lb/in³)** | | **Melting Range** | **1330-1380°C (2426-2516°F)** | | **Electrical Resistivity** | **1.28 μΩ·m** | | **Thermal Conductivity** | **12.1 W/m·K (at 100°C)** | | **Coefficient of Thermal Expansion** | **12.8 μm/m·°C (20-300°C)** | | **Specific Heat Capacity** | **448 J/kg·K** | | **Magnetic Permeability** | **< 1.005 (essentially non-magnetic)** | --- #### **Mechanical Properties (Annealed Condition)** | Temperature | Tensile Strength | Yield Strength (0.2%) | Elongation | |-------------|------------------|---------------------|------------| | **Room Temperature** | **690 MPa (100 ksi)** | **310 MPa (45 ksi)** | **50%** | | **650°C (1200°F)** | **550 MPa (80 ksi)** | **240 MPa (35 ksi)** | **40%** | | **815°C (1500°F)** | **380 MPa (55 ksi)** | **205 MPa (30 ksi)** | **45%** | | **980°C (1800°F)** | **170 MPa (25 ksi)** | **110 MPa (16 ksi)** | **55%** | --- #### **High-Temperature Performance Characteristics** | Property | Performance | Temperature Limit | |-------------|-------------|-------------------| | **Oxidation Resistance** | **Excellent** | **Up to 1200°C (2192°F)** | | **Creep Strength** | **Outstanding** | **Long-term service at 815°C (1500°F)** | | **Thermal Stability** | **Excellent** | **Resists embrittlement up to 980°C** | | **Molten Salt Compatibility** | **Superior** | **Fluoride salt environments** | --- #### **Key Characteristics & Applications** **Key Characteristics:** - **Exceptional High-Temperature Strength**: Maintains mechanical properties up to 1200°C - **Outstanding Oxidation Resistance**: Forms protective chromium oxide scale - **Excellent Creep Resistance**: Superior long-term stability under load - **Molten Salt Compatibility**: Specifically resistant to fluoride salt corrosion - **Good Thermal Stability**: Minimal microstructural degradation over time - **Excellent Fabricability**: Can be welded and formed using standard methods **Typical Applications:** - **Nuclear Industry**: Molten salt reactor components, heat exchangers - **Aerospace**: Gas turbine components, combustion chambers - **Heat Treating Industry**: Furnace fixtures, retorts, and radiant tubes - **Chemical Processing**: High-temperature reactors and heat exchangers - **Power Generation**: Gas turbine components and high-temperature systems - **Research Facilities**: Advanced nuclear and materials testing systems - **Industrial Heating**: High-temperature processing equipment --- #### **International Standards & Specifications** | Standard | Designation | Description | |----------|-------------|-------------| | **UNS** | **N10003** | **Unified Numbering System** | | **AMS** | **5607** | **Sheet, Strip, and Plate** | | **AMS** | **5771** | **Bars, Forgings, and Rings** | | **ASTM** | **B435** | **Plate, Sheet, and Strip** | | **ASTM** | **B572** | **Rod and Bar** | | **ASME** | **Boiler Code** | **Approved for elevated temperature service** | --- #### **Manufacturing & Processing** **Available Forms:** - **Plate and Sheet**: 0.5 mm to 100 mm thickness - **Bar and Rod**: 5 mm to 300 mm diameter - **Pipe and Tube**: 10 mm to 600 mm diameter - **Wire and Strip**: Various sizes for specialized applications - **Forgings and Rings**: Custom components for critical applications **Processing Guidelines:** - **Hot Working**: 1150-1200°C (2102-2192°F) - **Cold Working**: Good capability with intermediate annealing - **Solution Annealing**: 1150-1175°C (2102-2147°F) with rapid cooling - **Welding**: Excellent weldability using GTAW, GMAW with matching filler metals - **Machining**: Similar to other nickel-based superalloys --- #### **Quality Control & Testing** - **Chemical Analysis**: Per ASTM E1473 - **Mechanical Testing**: Per ASTM E8/E8M and E21 - **Creep and Stress Rupture**: Per ASTM E139 - **Non-Destructive Testing**: UT, RT, PT as required - **Metallographic Examination**: Per ASTM E3 and E112 - **High-Temperature Testing**: Oxidation and thermal stability evaluation --- #### **Comparison with Competitive Alloys** | Property | Hastelloy N | Alloy 600 | Alloy 800H | Alloy X | |----------|-------------|-----------|------------|---------| | **Max Service Temperature** | **1200°C** | **1095°C** | **1150°C** | **1150°C** | | **Oxidation Resistance** | **Excellent** | Good | Very Good | Excellent | | **Molten Salt Resistance** | **Superior** | Poor | Poor | Fair | | **Fabricability** | **Excellent** | Excellent | Excellent | Good | --- #### **Summary** **Hastelloy® N Alloy (UNS N10003)** represents a specialized high-temperature nickel-based alloy engineered for exceptional performance in extreme thermal environments, particularly in molten fluoride salt applications. Its unique combination of high-temperature strength, outstanding oxidation resistance, and specific corrosion resistance to molten salts makes it invaluable for advanced nuclear systems, aerospace applications, and high-temperature industrial processes. Supported by comprehensive standardization through AMS 5607 and AMS 5771 specifications, this alloy delivers reliable, long-term performance in the most demanding high-temperature applications. The alloy's proven track record in nuclear service, combined with excellent fabricability and thermal stability, ensures its continued importance in advanced energy systems and high-temperature industrial applications where conventional materials cannot provide adequate performance.

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 3250 gallon liquid totes Special package is available on request.