Alloy 718，Inconel 718 Tube，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 Tube (UNS N07718)** #### **Overview** **Alloy 718 Tube** (commercially known as **Inconel® 718 Tube**) is a high-performance nickel-chromium superalloy tubing product designed for extreme service conditions. This precipitation-hardenable alloy maintains exceptional strength, corrosion resistance, and structural stability in temperatures ranging from cryogenic conditions up to 700°C (1300°F). The tube form is manufactured through precision processes to ensure consistent wall thickness, superior surface finish, and reliable performance in critical applications involving high pressure, corrosive media, and thermal cycling. Manufactured to meet the most stringent quality standards, Inconel 718 tubes provide excellent resistance to oxidation, carburization, and other forms of high-temperature degradation, making them indispensable in aerospace, oil and gas, and nuclear industries. --- #### **Chemical Composition** The chemical composition of Alloy 718 Tube (UNS N07718) is carefully controlled to ensure optimal performance: | 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 precise chemical balance enables formation of gamma double prime [γ'' Ni₃Nb] and gamma prime [γ' Ni₃(Al,Ti)] precipitates during aging treatment, providing exceptional strength and thermal stability.* --- #### **Physical Properties** Critical properties for tube design and application 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** Properties vary with heat treatment condition and tube size: **Solution Annealed + Aged Condition (Typical):** * **Ultimate Tensile Strength:** ≥ 1275 MPa (185 ksi) * **Yield Strength (0.2% Offset):** ≥ 1035 MPa (150 ksi) * **Elongation:** ≥ 15% * **Hardness:** 35-42 HRC **Pressure Performance:** * **Maximum Working Temperature:** 700°C (1300°F) * **Minimum Cryogenic Service:** -253°C (-423°F) * **Burst Pressure:** Excellent resistance to internal pressure failure --- #### **International Standards** Alloy 718 Tube complies with major 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:** Standard Specification for General Requirements for Chemical Check Analysis Limits for Nickel, Nickel Alloys and Cobalt Alloys **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 718 tubes serve in critical applications across multiple 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 **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 --- #### **Key Advantages** * **Exceptional Strength-to-Weight Ratio:** High strength maintained in thin-wall tube configurations * **Superior Corrosion Resistance:** Excellent resistance to oxidizing and reducing environments * **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 * **Dimensional Stability:** Minimal creep and thermal growth at elevated temperatures * **Quality Consistency:** Uniform microstructure and mechanical properties throughout tube length **Note:** *Inconel® is a registered trademark of Special Metals Corporation, a PCC company. Alloy 718 tubes are available in seamless and welded construction, with OD sizes typically ranging from 1/8" to 4" and wall thicknesses from 0.010" to 0.250". Proper cleaning and passivation are recommended after fabrication to maintain corrosion resistance.*

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 1784 gallon liquid totes Special package is available on request.