Alloy 722，Inconel 722 Tube，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 Tube (UNS N07722)** #### **Overview** **Alloy 722 Tube** (commercially known as **Inconel® 722 Tube**) is a high-performance nickel-chromium superalloy tubing product engineered for extreme service conditions requiring exceptional strength, corrosion resistance, and thermal stability. This precipitation-hardenable alloy maintains outstanding mechanical properties from cryogenic temperatures up to 815°C (1500°F), making it ideal for applications involving high pressure, corrosive media, and thermal cycling. The tube is manufactured through precision processes to ensure consistent wall thickness, superior surface finish, and reliable performance in critical aerospace, energy, and chemical processing applications. The alloy's enhanced characteristics are achieved through a sophisticated precipitation-hardening mechanism involving gamma prime [γ'] phase formation, providing exceptional microstructural stability and retention of mechanical properties after prolonged exposure to aggressive service conditions. --- #### **Chemical Composition** The chemical composition of Alloy 722 Tube (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 tube design and application engineering: | 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:** 15-25% * **Hardness:** 38-44 HRC **Pressure Performance:** * **Maximum Working Temperature:** 815°C (1500°F) * **Minimum Cryogenic Service:** -253°C (-423°F) * **Burst Pressure:** Excellent resistance to internal pressure failure --- #### **International Standards** Alloy 722 Tube conforms to several international specifications: **ASTM Standards:** * **ASTM B829:** Standard Specification for Seamless Nickel and Nickel Alloy Pipe and Tube * **ASTM B751:** Standard Specification for Nickel-Alloy Seamless and Welded Tube * **ASTM B880:** General Requirements for Chemical Check Analysis Limits **Aerospace Standards:** * **AMS 5580:** Seamless Tube, Nickel Alloy, Corrosion and Heat-Resistant * **AMS 5582:** Welded Tube, Nickel Alloy, Corrosion and Heat-Resistant **Other Standards:** * **ISO 6207:** Nickel and nickel alloy tubes * **DIN 17751:** Nickel and nickel alloy tubes - Technical delivery conditions * **ASME SB829:** Specification for Seamless Nickel and Nickel Alloy Pipe and Tube --- #### **Product Applications** Alloy 722 tubes serve critical functions across multiple high-performance industries: **Aerospace & Defense:** * **Aircraft Hydraulic Systems:** High-pressure hydraulic lines, actuator tubing * **Engine Systems:** Fuel feed lines, lubrication systems, bleed air ducts * **Rocket Propulsion:** Propellant lines, cooling jackets, turbopump tubing * **Space Vehicles:** Cryogenic fluid transfer lines, structural tubing **Oil & Gas Industry:** * **Downhole Instruments:** Instrument protection tubing, control line conduits * **Subsea Systems:** Chemical injection lines, hydraulic control tubing * **Surface Equipment:** Pressure gauge lines, sensor tubing, sample lines * **Well Completion:** Control line tubing for downhole valves **Power Generation:** * **Nuclear Plants:** Instrumentation tubing, control rod drive mechanisms * **Gas Turbines:** Fuel nozzle tubing, thermocouple protection tubes * **Heat Exchangers:** High-temperature heat exchanger tubes * **Solar Energy:** Heat transfer fluid tubing systems **Industrial Processing:** * **Chemical Industry:** Process instrumentation tubing, analytical sample lines * **Heat Treatment:** Radiant tubes, furnace rollers, heat treatment fixtures * **Medical Equipment:** High-strength medical device components * **Research Applications:** Specialized laboratory and testing equipment --- #### **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 corrosive media * **Exceptional Strength-to-Weight Ratio:** High strength maintained in thin-wall tube configurations * **Excellent Fabricability:** Can be bent, flared, flanged, and welded using standard techniques * **Outstanding Fatigue Performance:** Superior resistance to vibration and pressure cycling * **Wide Temperature Capability:** Performs reliably from cryogenic to high-temperature service * **Pressure Integrity:** Maintains structural integrity under high internal and external pressures **Available Forms & Sizes:** * **Seamless Tubes:** OD from 1.6mm to 100mm (0.062" to 4") * **Welded Tubes:** OD from 6mm to 50mm (0.25" to 2") * **Wall Thickness:** 0.5mm to 10mm (0.020" to 0.394") * **Lengths:** Standard random lengths or cut-to-size **Surface Conditions:** * **Annealed and Pickled:** Clean, scale-free surface * **Bright Annealed:** Smooth, shiny surface finish * **Cold Drawn:** Precision dimensional control * **Special Coatings:** Custom surface treatments available **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 * **Stress Relieving:** Available for cold worked and welded tubes **Note:** *Inconel® is a registered trademark of Special Metals Corporation. Alloy 722 tubes are available in seamless and welded construction, with various sizes and wall thicknesses to meet specific application requirements. Proper cleaning and passivation are recommended after fabrication to maintain corrosion resistance. Comprehensive certification including chemical analysis, mechanical properties, and non-destructive testing reports are 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 1797 gallon liquid totes Special package is available on request.