UNS N07718 / Alloy 718 Pipe Tube Picked/BA Surface Inconel 718 Alloy Seamless Pipe

Products Specification

Inconel 718 Seamless Tube: Description, Parameters, Features, Standards, Specifications, and Applications

Inconel 718 seamless tubes are high-performance nickel-chromium-based superalloy tubes manufactured through a hot or cold working process without any welding seams. This alloy is renowned for its exceptional strength, corrosion resistance, and ability to withstand extreme temperatures and pressures, making it ideal for demanding applications in aerospace, oil & gas, and chemical processing industries.

• Chemical Composition (%):

• Nickel (Ni): 50-55
• Chromium (Cr): 17-21
• Iron (Fe): Balance
• Niobium (Nb): 4.75-5.5
• Molybdenum (Mo): 2.8-3.3
• Titanium (Ti): 0.65-1.15
• Aluminum (Al): 0.2-0.8
• Carbon (C): ≤0.08
• Manganese (Mn): ≤0.35
• Silicon (Si): ≤0.35

• Mechanical Properties:

  • Tensile Strength: ≥1035 MPa (150 ksi)

  • Yield Strength: ≥725 MPa (105 ksi)

  • Elongation: ≥12%

  • Hardness: ≤35 HRC

• Temperature Resistance:

  • Continuous Service: -423°C to 705°C (-700°F to 1300°F)

  • Short-term Exposure: Up to 980°C (1800°F)

Features of Inconel 718 Nickel Alloy Pipe

• High Strength: Maintains mechanical properties in extreme environments.
• Corrosion Resistance: Resists oxidation, pitting, and crevice corrosion in harsh media.
• Cryogenic Toughness: Performs well in sub-zero temperatures.
• Fatigue Resistance: Excellent resistance to cyclic stresses.
• Weldability: Can be welded using conventional methods (though post-weld heat treatment is recommended).

Standards & Specifications of Inconel 718 Nickel Alloy Pipe

• ASTM: B516/B516M (U-bend tubes), B517/B517M (welded), B444 (pipe)

• ASME: SB516, SB517, SB444

• AMS: 5596 (sheet/strip), 5662 (bar/forging)

• EN/DIN: 2.4668 (European equivalent)

• NACE: MR0175/ISO 15156 compliant for sour service.

Common Specifications of Inconel 718 Nickel Alloy Pipe

• Outer Diameter (OD): 6 mm to 250 mm (custom sizes available)

• Wall Thickness: 1 mm to 20 mm

• Length: Up to 12 meters (custom lengths possible)

• Forms: Straight lengths, U-tubes, coiled tubing.

Applications of Inconel 718 Nickel Alloy Pipe

• Aerospace: Jet engine components, turbine blades, exhaust systems.

• Oil & Gas: Downhole tubing, wellhead parts, subsea equipment.

• Chemical Processing: Reactors, heat exchangers, piping for corrosive fluids.

• Nuclear Industry: Reactor core components, fuel assemblies.

• Power Generation: Gas turbines, boiler components.

Inconel 718 seamless tubes are a premium choice for critical environments where reliability and durability are paramount.

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