Seamless Inconel 718 Tube

Inconel 718 Seamless Tube

UNS N07718 | 2.4668 | ASTM B167
Inconel 718 Seamless Tube (N07718 / 2.4668) is manufactured to ASTM B167 from tube billet, cold-drawn to the required outside diameter and wall thickness. Supplied from our Wenzhou mill with EN 10204 3.1 mill test certificate, PMI and dimensional inspection on request.
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Inconel 718 Product Overview and Advantages

What is a Seamless Inconel 718 Tube?

A SeamlessInconel 718 tube (UNS N07718) is a high-performance nickel-chromium-iron superalloy pipe produced from a solid billet without any welding seams.

Compared to welded tubes, seamlessInconel 718 tubing offers:

  • Superior structural integrity
  • Enhanced pressure resistance
  • Zero weld-related failure risk

This makes it ideal for high-temperature, high-pressure, and corrosive environments.

Inconel 718 is a precipitation-hardenednickel alloy known for its excellent tensile strength, creep resistance, and rupture strength at temperatures up to 1300°F (704°C).

Key Advantages of Inconel 718 Seamless Tubes

1. High-Temperature Strength

Maintains excellent mechanical properties from cryogenic temperatures to 704°C (1300°F), making it suitable for extreme thermal environments.

FeatureDescription
2. Superior Corrosion Resistance
  • Resistant to oxidation and scaling
  • Excellent resistance to stress corrosion cracking (SCC)
  • Performs reliably in acidic and H₂S (sour gas) environments

3. High Pressure Capability

Produced in accordance with ASTM B829, enabling higher allowable pressure ratings for oil & gas and hydraulic systems.

4. Excellent Fatigue Resistance

Ideal for applications involving cyclic loads, vibration, and dynamic stress.

Inconel 718 Product Specifications and Data

To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for Inconel 718.

The composition of Inconel 718 is carefully balanced to achieve its superior high-temperature strength and corrosion resistance.

Chemical Composition of Inconel 718

GradeNiCrFeMnNbMoTiCSiSPCoB
High50.0-
55.0		17.00-21.00Bal≤0.354.75-
5.50		2.80-
3.30		0.65-
1.15		≤0.08≤0.35≤0.015≤0.015≤1.0≤0.006

Inconel 718 is specifically designed to maintain its strength and shape in high-stress, high-temperature environments.

Typical Mechanical Properties of Inconel 718

Tensile StrengthYield StrengthElongationHardness
≥ 1240 MPa≥ 1034 MPa≥20%≤40 HRC

These physical properties highlight the material's ability to perform reliably under a wide range of conditions.

Typical Physical Properties of Inconel 718

DensityMelting PointThermal ExpansionThermal ConductivityModulus of ElasticityElectrical Resistivity
8.22 g/cm³1260 - 1336 °C13.0 µm/m·°C (20-100°C)11.4 W/m·K (20°C)200 GPa1.2 x 10⁻⁶ Ω·m (20°C)
Nominal Outside Diameter, in. (mm)Outside Diameter in. (mm)Thickness of Specified Nominal Wall , %Thickness of Specified Minimum Wall , %
PlusMinusPlusMinusPlusMinus
Over 0.400 (10) to 5/8 (16), excl0.005 (0.13)0.005 (0.13)1515300
5/8 (16) to 1 1/2 (38), incl0.0075 (0.19)0.0075 (0.19)1010220
Over 1 1/2 (38) to 3 (76), incl0.010 (0.25)0.010 (0.25)1010220
Over 3 (76) to 4 1/2 (114), incl0.015 (0.38)0.015 (0.38)1010220
Over 4 1/2 (114) to 6 (152), incl0.020 (0.51)0.020 (0.51)12.512.5280
Over 6 (152) to 6 5/8 (168), incl0.025 (0.64)0.025 (0.64)12.512.5280
Over 6 5/8 (168) to 8 5/8 (219), incl0.031 (0.79)0.031 (0.79)12.512.5280

Applications of Inconel 718 Seamless Tubing

IndustryTypical Applications
Aerospace Industry
  • Jet engine components
  • Rocket motors
  • High-temperature fasteners
IndustryTypical Applications
Oil & Gas (HPHT Applications)
  • Downhole tubing
  • Wellhead components
  • Subsea valves
Power Generation
  • Gas turbines
  • Nuclear reactor systems
Cryogenic Systems
  • LNG storage
  • Low-temperature piping
IndustryTypical Applications
5. Quality Inspection
  • 100% Eddy Current Testing (ECT)
  • Ultrasonic Testing (UT)
  • Hydrostatic Testing
IndustryTypical Applications
Why Choose Our Inconel 718 Seamless Pipes?
  • Produced according to ASTM B829 / ASME standards
  • Suitable for marine, offshore, and aerospace applications
  • Available with third-party inspection (e.g., ABS, PED)
  • Full traceability and high-performance reliability

Frequently Asked Questions About Inconel 718 Seamless Tubes

What is Inconel 718 Seamless Tube?

A Seamless Inconel 718 tube (UNS N07718) is a high-performance nickel-chromium-iron superalloy pipe produced from a solid billet without any welding seams.

Which standards does Inconel 718 Seamless Tube comply with?

Inconel 718 Seamless Tube is produced to ASTM B829, ASTM B167.

What are the typical applications of Inconel 718 Seamless Tube?

Typical uses of Inconel 718 Seamless Tube include: Jet engine components; Rocket motors; High-temperature fasteners; Downhole tubing.

Request a Inconel 718 Tube Quotation

Send us your specification for High seamless tube — OD, wall thickness, standard and quantity — and our engineering team will reply with a quotation within 24 hours.

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Inconel 718 Related Grades and Product Forms

Other grades in the Xinzhe seamless range, and the same alloy in alternative product forms:

Product ranges:Inconel Alloy Pipes·Stainless Steel Pipes