Alloy 722，Inconel 722 Pipe，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 Pipe (UNS N07722)** #### **Overview** **Alloy 722 Pipe** (commercially known as **Inconel® 722 Pipe**) is a high-performance nickel-chromium superalloy piping product specifically engineered for extreme service conditions requiring exceptional strength and corrosion resistance at elevated temperatures. This precipitation-hardenable alloy maintains outstanding mechanical properties from cryogenic conditions up to 815°C (1500°F), making it ideal for transporting corrosive fluids, high-temperature gases, and high-pressure media in the most demanding industrial applications. The pipe is manufactured through advanced thermo-mechanical processes and controlled heat treatments to ensure uniform microstructure, consistent wall thickness, and reliable performance in critical aerospace, energy, and chemical processing systems. 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 Pipe (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 piping system design and 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:** 12-20% * **Hardness:** 38-46 HRC **Pressure Performance:** * **Maximum Working Pressure:** Varies with pipe size and wall thickness * **Temperature Rating:** Up to 815°C (1500°F) continuous service * **Burst Pressure:** Excellent resistance to internal pressure deformation --- #### **International Standards** Alloy 722 Pipe conforms to several international specifications: **ASTM Standards:** * **ASTM B829:** Standard Specification for Seamless Nickel and Nickel Alloy Pipe and Tube * **ASTB B705:** Standard Specification for Nickel-Alloy Welded Pipe * **ASTM B804:** UNS N07718 Welded Pipe **ASME Standards:** * **ASME SB829:** Specification for Seamless Nickel and Nickel Alloy Pipe and Tube * **ASME SB705:** Nickel-Alloy Welded Pipe **Other International Standards:** * **ISO 6207:** Nickel and nickel alloy pipes * **DIN 17750:** Nickel and nickel alloy pipes - Technical delivery conditions * **GB/T 2882:** Chinese standard for nickel and nickel alloy pipes --- #### **Product Applications** Alloy 722 pipes serve critical functions across multiple high-performance industries: **Aerospace & Defense:** * **Aircraft Hydraulic Systems:** High-pressure hydraulic lines and fuel systems * **Engine Systems:** Bleed air ducts, lubrication systems, exhaust components * **Rocket Propulsion:** Propellant feed lines and cooling channels * **Space Vehicles:** Cryogenic fluid transfer lines, structural piping **Oil & Gas Industry:** * **Downhole Tubing:** Production tubing, casing strings for sour gas wells * **Surface Piping:** Flow lines, gathering lines, and process piping * **Subsea Systems:** Risers, jumpers, and manifold piping * **Well Intervention:** Coiled tubing and workstring applications **Power Generation:** * **Nuclear Plants:** Primary coolant pipes, instrument tubing * **Gas Turbines:** Fuel gas piping, hydraulic control lines * **Solar Thermal:** Heat transfer fluid piping systems * **Geothermal:** High-temperature geothermal piping **Chemical Processing:** * **Process Piping:** Corrosive chemical transport systems * **Heat Exchanger Tubes:** High-temperature heat exchanger applications * **Reactor Systems:** Process reactor feed and discharge lines * **Furnace Components:** Radiant tubes and heat treatment piping --- #### **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 * **Pressure Integrity:** Excellent resistance to internal and external pressure deformation * **Good Fabricability:** Can be bent, formed, and fabricated using standard pipe working equipment * **Excellent Weldability:** Can be welded using conventional methods with proper technique * **Thermal Stability:** Maintains dimensional stability under thermal cycling conditions * **Long Service Life:** Maintains performance in aggressive environments over extended periods **Available Forms & Sizes:** * **Seamless Pipe:** OD from 6mm to 400mm (0.25" to 16") * **Welded Pipe:** OD from 6mm to 1200mm (0.25" to 48") * **Wall Thickness:** Schedule 5S to XXS, custom thickness available * **Lengths:** Random lengths, double random, or cut-to-size **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 welded components **Note:** *Inconel® is a registered trademark of Special Metals Corporation. Alloy 722 pipes are available in seamless and welded configurations, with various schedules and sizes to meet specific application requirements. Proper installation, including appropriate support and expansion considerations, is essential for optimal performance in high-temperature service. 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 1796 gallon liquid totes Special package is available on request.