Alloy 722，Inconel 722 ，UNS N07722，EFORU

British Specs:，American Specs:AMS 5541 Sheet and Strip AMS 5714 Bar and Forgings，German Specs:

### **Product Introduction: Alloy 722 / Inconel 722 (UNS N07722)** #### **Overview** **Alloy 722** (commercially known as **Inconel® 722**) is a precipitation-hardenable nickel-chromium-iron superalloy with significant additions of molybdenum and niobium, specifically designed for exceptional strength and corrosion resistance in extreme environments. This alloy maintains outstanding mechanical properties at temperatures up to 815°C (1500°F), offering superior performance in highly corrosive and high-stress applications. With its excellent combination of high-temperature strength, oxidation resistance, and fabricability, Alloy 722 has become a critical material for aerospace, chemical processing, and energy industry applications where reliability under severe conditions is paramount. The alloy's enhanced properties are achieved through a sophisticated precipitation-hardening mechanism involving the formation of gamma prime [γ'] and other secondary phases, providing exceptional microstructural stability and retention of mechanical properties after prolonged exposure to elevated temperatures. --- #### **Chemical Composition** The chemical composition of Alloy 722 (UNS N07722) is carefully balanced for optimal performance: | Element | Content (%) | | :--- | :--- | | **Nickel (Ni)** | 45.0 - 50.0 | | **Chromium (Cr)** | 14.0 - 17.0 | | **Iron (Fe)** | Balance | | **Molybdenum (Mo)** | 6.0 - 8.0 | | **Niobium (Nb)** | 1.5 - 2.5 | | **Titanium (Ti)** | 2.0 - 3.0 | | **Aluminum (Al)** | 1.0 - 1.8 | | **Cobalt (Co)** | ≤ 1.00 | | **Carbon (C)** | ≤ 0.08 | | **Manganese (Mn)** | ≤ 0.50 | | **Silicon (Si)** | ≤ 0.50 | | **Sulfur (S)** | ≤ 0.015 | | **Copper (Cu)** | ≤ 0.30 | | **Boron (B)** | 0.003 - 0.010 | *The optimized composition provides enhanced solid solution strengthening and precipitation hardening capability through carefully balanced aluminum and titanium ratios.* --- #### **Physical Properties** Critical properties for high-temperature design applications: | Property | Metric Value | Imperial Value | | :--- | :--- | :--- | | **Density** | 8.10 g/cm³ | 0.292 lb/in³ | | **Melting Range** | 1350 - 1400 °C | 2460 - 2550 °F | | **Specific Heat (20°C)** | 440 J/kg·K | 0.105 Btu/lb·°F | | **Thermal Conductivity (20°C)** | 12.0 W/m·K | 83.3 Btu·in/hr·ft²·°F | | **Thermal Expansion Coefficient (20-100°C)** | 12.5 μm/m·°C | 6.9 μin/in·°F | | **Modulus of Elasticity** | 210 GPa | 30.5 x 10⁶ psi | | **Electrical Resistivity** | 1.20 μΩ·m | - | --- #### **Mechanical Properties** Enhanced mechanical properties achieved through optimized heat treatment: **Solution Annealed + Aged Condition:** * **Ultimate Tensile Strength:** 1300-1450 MPa (188-210 ksi) * **Yield Strength (0.2% Offset):** 1100-1250 MPa (160-181 ksi) * **Elongation:** 12-20% * **Reduction of Area:** 15-25% * **Hardness:** 38-46 HRC **Elevated Temperature Performance:** * **0.2% Yield Strength at 650°C (1200°F):** ≥ 950 MPa (138 ksi) * **Stress Rupture Life at 730°C (1350°F):** ≥ 100 hours at 310 MPa (45 ksi) * **Creep Resistance:** Excellent up to 815°C (1500°F) --- #### **International Standards** Alloy 722 conforms to several international specifications: **Aerospace Material Specifications:** * **AMS 7858:** Bars, Forgings, and Rings * **AMS 7859:** Solution Heat Treated and Aged Condition **ASTM Standards:** * **ASTM B637:** Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock * **ASTM B670:** Plate, Sheet, and Strip **Other International Standards:** * **ISO 9724:** Nickel and Nickel Alloy Forgings * **DIN 17752:** Wrought Nickel and Nickel Alloys * **GB/T 14992:** Chinese Standard for High Temperature Alloys --- #### **Product Applications** Alloy 722 serves in the most demanding applications across multiple industries: **Aerospace & Defense:** * **Gas Turbine Engines:** Turbine disks, blades, shafts, and compressor components * **Rocket Systems:** Turbopump components, thrust chambers, nozzle parts * **Aircraft Structures:** High-temperature fasteners, engine mounts **Oil & Gas Industry:** * **Downhole Tools:** Drill collars, subs, hangers for sour service * **Wellhead Equipment:** Valve components, Christmas tree parts * **Subsea Systems:** Connectors, pressure-containing components **Power Generation:** * **Gas Turbines:** Rotor components, blade rings, turbine disks * **Nuclear Applications:** Reactor core components, control rod mechanisms * **Steam Turbines:** High-pressure sections, valve stems **Chemical Processing:** * **Reactor Vessels:** High-temperature chemical reactors * **Heat Exchangers:** Tube sheets, header components * **Furnace Components:** Radiant tubes, retorts, fixtures --- #### **Key Advantages** * **Enhanced High-Temperature Strength:** Superior mechanical properties retention up to 815°C (1500°F) * **Excellent Oxidation Resistance:** Outstanding performance in oxidizing atmospheres * **Superior Corrosion Resistance:** Excellent resistance to sulfidation and other corrosive media * **Improved Microstructural Stability:** Enhanced resistance to phase transformation at high temperatures * **Good Fabricability:** Can be forged, machined, and welded using standard methods * **Excellent Creep Rupture Strength:** Superior long-term performance under stress at elevated temperatures * **Thermal Fatigue Resistance:** Excellent resistance to thermal cycling damage * **Optimized Precipitation Hardening:** Controlled aging response for tailored mechanical properties **Heat Treatment Specifications:** * **Solution Treatment:** 1100-1150°C (2010-2100°F) followed by rapid cooling * **Aging Treatment:** 730-760°C (1350-1400°F) for 8-16 hours, air cool * **Double Aging:** Optional second aging at 650-680°C (1200-1250°F) for enhanced properties **Note:** *Inconel® is a registered trademark of Special Metals Corporation. Alloy 722 requires specific heat treatment cycles to achieve optimal properties, with careful control of solution treatment temperatures and aging parameters to prevent undesirable phase formation. The alloy demonstrates good weldability but requires proper post-weld heat treatment to restore properties in the heat-affected zone. Comprehensive material certification including chemical analysis, mechanical properties, and microstructural examination is typically provided 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 1793 gallon liquid totes Special package is available on request.