ALLOY X Cast UNS N06002 Severe Corrosion and Heat Resistant Alloy,1

### **Product Introduction: ALLOY X (Cast UNS N06002) Severe Corrosion and Heat Resistant Alloy** **Overview** ALLOY X, with the cast and wrought unified numbering system designation UNS N06002, is a nickel-chromium-iron-molybdenum alloy renowned for its exceptional combination of high-temperature strength, outstanding oxidation resistance, and excellent fabricability. It is one of the most versatile alloys for service in high-temperature environments, maintaining its structural integrity and resisting degradation from thermal cycling, carburization, and oxidizing atmospheres up to 1200°C (2200°F). While it offers good resistance to a variety of corrosive media, its primary distinction lies in its superior performance in high-heat applications, making it a premier choice for aerospace and industrial heating sectors. --- #### **Chemical Composition (Typical % by Weight, per AMS 5390)** The composition of ALLOY X is engineered to form a stable, protective oxide layer and retain strength at elevated temperatures. | Element | Content (%) | Role & Benefit | | :--- | :--- | :--- | | **Nickel (Ni)** | Balance | Provides the fundamental austenitic matrix, ensuring high metallurgical stability and strength at elevated temperatures. | | **Chromium (Cr)** | 20.5 - 23.0 | Forms a tenacious, self-healing chromium oxide (Cr₂O₃) scale on the surface, providing exceptional resistance to oxidation and sulfidation. | | **Iron (Fe)** | 17.0 - 20.0 | Provides solid solution strengthening and helps control cost while maintaining good oxidation resistance. | | **Molybdenum (Mo)** | 8.0 - 10.0 | Imparts solid solution strengthening and enhances resistance to reducing acids. Critical for high-temperature creep strength. | | **Cobalt (Co)** | 0.5 - 2.5 | Contributes to solid solution strengthening and enhances high-temperature performance. | | **Tungsten (W)** | 0.2 - 1.0 | Works synergistically with Molybdenum to enhance strength and stability at high temperatures. | | **Carbon (C)** | 0.05 - 0.15 | Controlled content provides high-temperature strength through carbide formation without significantly compromising ductility. | | **Manganese (Mn)**| 1.00 max | Aids in manufacturability and controls sulfur. | | **Silicon (Si)** | 1.00 max | Enhances resistance to oxidation and carburization by modifying the protective scale. | *Note: "Hastelloy® X" is a registered trademark of Haynes International Inc.* --- #### **Physical & Mechanical Properties (Typical)** | Property | Value / Condition | | :--- | :--- | | **Density** | 8.22 g/cm³ (0.297 lb/in³) | | **Melting Range** | 1260 - 1355 °C (2300 - 2475 °F) | | **Specific Heat** | 455 J/kg·K (0.109 BTU/lb·°F) @ 20°C | | **Thermal Conductivity**| 11.9 W/m·K (82.5 BTU·in/hr·ft²·°F) @ 100°C | | **Thermal Expansion** | 12.5 μm/m·°C (6.9 μin/in·°F) @ 20-100°C | | **Tensile Strength (Room Temp)** | 655 MPa (95 ksi) min | | **Yield Strength (0.2% Offset, Room Temp)** | 240 MPa (35 ksi) min | | **Elongation (Room Temp)** | 35% min | --- #### **International Standards and Specifications** ALLOY X is specified by stringent international standards, particularly in the aerospace industry. * **Cast Product Standards:** * **AMS 5390:** Aerospace Material Specification for investment castings, covering the precise requirements for high-integrity components. * **UNS N06002:** Unified Numbering System designation for both cast and wrought forms. * **Wrought Product Standards:** * **AMS 5536:** For plate, sheet, and strip. * **ASTM B435:** Standard Specification for UNS N06002 Plate, Sheet, and Strip. * **ASTM B572:** Standard Specification for UNS N06002 Rod. --- #### **Product Applications** ALLOY X cast components are critical in applications where high temperature and structural strength are the primary concerns. 1. **Aerospace & Gas Turbines:** * Combustion cans, liners, and transition ducts. * Afterburner components, flame holders, and spray bars. * Turbine seals and ring segments. 2. **Industrial Heating & Heat Treating:** * Radiant tubes, muffles, and retorts for furnace equipment. * Heat treatment baskets and fixtures. * Components in carburizing and neutral hardening atmospheres. 3. **Petrochemical Processing:** * Components in steam methane reformers and ethylene furnaces (e.g., pigtails, outlet manifolds). * Equipment exposed to catalytic reforming environments. 4. **Power Generation:** * Components in industrial gas turbines for power generation. #### **Key Advantages** * **Exceptional High-Temperature Strength:** Maintains high mechanical strength and excellent creep-rupture properties at temperatures up to 1200°C (2200°F). * **Outstanding Oxidation Resistance:** The high chromium content forms a highly protective scale, providing superior resistance to scaling and spalling in cyclic high-temperature service. * **Excellent Fabricability:** It can be readily formed and welded using standard commercial techniques, allowing for the manufacture of complex components. * **Good Resistance to Reducing Atmospheres:** Performs well in carburizing and sulfidizing environments, unlike many other high-temperature alloys. **Conclusion** ALLOY X (UNS N06002) is a time-tested and proven nickel-based superalloy that excels in the most demanding high-temperature applications. Its unique balance of oxidation resistance, high structural strength, and fabricability makes it an indispensable material for critical components in aerospace propulsion, industrial heating, and petrochemical processing. Its compliance with rigorous standards like AMS 5390 ensures the quality and reliability required for these severe-service environments.

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 3395 gallon liquid totes Special package is available on request.