Alloy 718，Inconel 718 Pipe，UNS N07718，EFORU

British Specs:，American Specs: AMS 5662 Bar and Forgings AMS 5663 Bar and Forgings AMS 5664 Bar and Forgings AMS 5589 Seamless Tube AMS 5590 (Tube *) AMS 5596 Sheet, Strip and Plate AMS 5597 Sheet, Strip and Plate AMS 5832 Welding Wire AMS 5914 Sheet, Strip and Foil AMS 5950 (718SPF) Sheet & Strip ASTM F3055 Powder，German Specs:

### **Product Introduction: Alloy 718 / Inconel 718 Pipe (UNS N07718)** #### **Overview** **Alloy 718 Pipe** (commercially known as **Inconel® 718 Pipe**) is a premium nickel-chromium superalloy pipe designed for critical applications requiring exceptional strength and corrosion resistance at elevated temperatures. As a precipitation-hardenable material, Inconel 718 pipe offers outstanding performance in extreme environments, maintaining structural integrity under high pressure and aggressive chemical conditions. The pipe form is manufactured through advanced processes to ensure uniform microstructure and mechanical properties throughout the product, making it ideal for transporting corrosive fluids, high-temperature gases, and high-pressure media in the most demanding industrial applications. The alloy's superior properties are derived from its unique age-hardening mechanism through the precipitation of gamma double prime (γ'') phase [Ni₃Nb], which provides excellent strength and microstructural stability up to 700°C (1300°F). --- #### **Chemical Composition** The chemical composition of Alloy 718 Pipe (UNS N07718) conforms to strict international standards: | Element | Content (%) | | :--- | :--- | | **Nickel (Ni)** | 50.0 - 55.0 | | **Chromium (Cr)** | 17.0 - 21.0 | | **Iron (Fe)** | Balance | | **Niobium (Nb)** | 4.75 - 5.50 | | **Molybdenum (Mo)** | 2.80 - 3.30 | | **Titanium (Ti)** | 0.65 - 1.15 | | **Aluminum (Al)** | 0.20 - 0.80 | | **Cobalt (Co)** | ≤ 1.00 | | **Carbon (C)** | ≤ 0.08 | | **Manganese (Mn)** | ≤ 0.35 | | **Silicon (Si)** | ≤ 0.35 | | **Sulfur (S)** | ≤ 0.015 | | **Copper (Cu)** | ≤ 0.30 | | **Boron (B)** | ≤ 0.006 | *The optimized composition enables precipitation hardening through gamma double prime [γ'' Ni₃Nb] and gamma prime [γ' Ni₃(Al,Ti)] phases during heat treatment.* --- #### **Physical Properties** These properties are critical for piping system design and engineering: | Property | Metric Value | Imperial Value | | :--- | :--- | :--- | | **Density** | 8.19 g/cm³ | 0.296 lb/in³ | | **Melting Range** | 1260 - 1336 °C | 2300 - 2440 °F | | **Specific Heat (20°C)** | 435 J/kg·K | 0.104 Btu/lb·°F | | **Thermal Conductivity (20°C)** | 11.4 W/m·K | 79.1 Btu·in/hr·ft²·°F | | **Thermal Expansion Coefficient (20-100°C)** | 13.0 μm/m·°C | 7.2 μin/in·°F | | **Modulus of Elasticity** | 200 GPa | 29.0 x 10⁶ psi | | **Electrical Resistivity** | 1.25 μΩ·m | - | --- #### **Mechanical Properties** Mechanical properties are developed through specific heat treatment cycles: **Solution Annealed + Aged Condition:** * **Ultimate Tensile Strength:** ≥ 1275 MPa (185 ksi) * **Yield Strength (0.2% Offset):** ≥ 1035 MPa (150 ksi) * **Elongation:** ≥ 12% * **Hardness:** 35-45 HRC **Pressure Rating:** * **Maximum Working Pressure:** Varies with pipe size and wall thickness * **Temperature Rating:** Up to 700°C (1300°F) continuous service * **Burst Pressure:** Excellent resistance to internal pressure deformation --- #### **International Standards** Alloy 718 Pipe conforms to numerous international specifications: **ASTM Standards:** * **ASTM B829:** Standard Specification for Seamless Nickel and Nickel Alloy Pipe and Tube * **ASTM B705:** Standard Specification for Nickel-Alloy (UNS N06625, N06219 and N08825) Welded Pipe * **ASTM B444:** Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloys (UNS N06625) Plate, Sheet, and Strip **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 718 pipes serve critical functions across multiple high-performance industries: **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 **Aerospace & Defense:** * **Hydraulic Systems:** High-pressure hydraulic lines and fuel systems * **Engine Systems:** Bleed air ducts, lubrication systems * **Rocket Propulsion:** Propellant feed lines and cooling channels **Power Generation:** * **Nuclear Plants:** Primary coolant pipes, instrument tubing * **Gas Turbines:** Fuel gas piping, hydraulic control lines * **Solar Thermal:** Heat transfer fluid piping systems **Chemical Processing:** * **Process Piping:** Corrosive chemical transport systems * **Heat Exchanger Tubes:** High-temperature heat exchanger applications * **Reactor Systems:** Process reactor feed and discharge lines --- #### **Key Advantages** * **Superior Corrosion Resistance:** Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking * **High-Temperature Strength:** Maintains mechanical properties at temperatures up to 700°C (1300°F) * **Excellent Weldability:** Can be welded using conventional methods with minimal post-weld heat treatment requirements * **Outstanding Fatigue Resistance:** Superior performance under cyclic pressure loading conditions * **Good Fabricability:** Can be bent, formed, and fabricated using standard pipe working equipment * **Pressure Integrity:** Excellent resistance to internal and external pressure deformation * **Long Service Life:** Maintains performance in aggressive environments over extended periods * **Versatile Applications:** Suitable for both high-temperature and cryogenic service conditions **Note:** *Inconel® is a registered trademark of Special Metals Corporation, a PCC company. Alloy 718 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.*

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 1783 gallon liquid totes Special package is available on request.