Inconel 718 Alloy Pipe (Ni-Cr-Fe-Nb Alloy) | Unmatched High-Temperature Strength & Fatigue Resistance

✓ Ultra-High Yield Strength: Achieves 1,275 MPa yield strength after aging – 40% stronger than Inconel 625 at 650°C (1,202°F).

✓ Oxidation Resistance: Stable Cr₂O₃ oxide layer formation at 800°C (1,472°F), reducing scaling by 70% vs. 310S stainless steel.

✓ Cryogenic-to-High-Temperature Versatility: Maintains ductility from **-250°C (-418°F)** to 700°C (1,292°F).

✓ Precision Manufacturing: Seamless and welded pipes with **±0.1mm wall thickness tolerance** and Ra ≤1.6μm internal finish for high-pressure fluid/gas transfer.

Inconel 718 Alloy Pipe (Ni-Cr-Fe-Nb Alloy)

Engineered for aerospace, oil & gas, and nuclear applications demanding extreme mechanical strength and thermal stability, Inconel 718 alloy pipe combines a nickel-chromium-iron-niobium matrix (Ni-52.5%, Cr-19%, Fe-18.5%, Nb-5%, Mo-3%) to deliver exceptional yield strength, creep resistance, and corrosion resistance up to 700°C (1,292°F). Certified to AMS 5662/5663, ASTM B637, and ASME SB637, this age-hardenable superalloy outperforms Inconel 625 and Waspaloy in high-stress environments, offering 2x the fatigue lifespan of 316L stainless steel in cyclic load applications.

Sizes: OD 6mm–300mm (seamless) / OD 300mm–1,200mm (welded)
Wall Thickness: 1mm–50mm
Surface Finishes: Pickled, Electropolished, Grinded (Ra ≤0.8μm)
Mechanical Properties (Aged): Yield Strength ≥1,100 MPa | Tensile Strength ≥1,400 MPa | Elongation ≥12% | Hardness ≤40 HRC

Parameter Category	Value/Description
Material Standard	ASTM B637 (Seamless Pipe), ASTM B829 (Welded Pipe), AMS 5596 (Aerospace)
Chemical Composition (%)	Ni (Balance), Cr 17.0–21.0, Fe ≤18.0, Nb+Ta 4.75–5.50, Mo 2.80–3.30, Ti 0.65–1.15, Al 0.20–0.80, C ≤0.08, Mn ≤0.35, Si ≤0.35, S ≤0.015, P ≤0.015, Cu ≤0.30
Tensile Strength (MPa)	≥1240 (Solution Treated & Aged)
Yield Strength (MPa)	≥1035 (Solution Treated & Aged)
Elongation (%)	≥12 (in 50mm gauge length)
High-Temperature Strength	– 650°C: Tensile Strength ≥950 MPa – 650°C: 100h Creep Rupture Strength ≥300 MPa
Hardness	Brinell (HBW): 330–400; Rockwell (HRC): 35–45
Density (g/cm³)	8.19
Melting Range (°C)	1260–1336
Thermal Conductivity (W/m·K)	11.4 (at 20°C)
Thermal Expansion (10⁻⁶/°C)	13.0 (20–600°C)
Electrical Resistivity (Ω·m)	1.28 × 10⁻⁶ (at 20°C)
Elastic Modulus (GPa)	200
Oxidation Resistance	Excellent oxidation resistance up to 700°C in air. Stable under cyclic thermal stress.
Corrosion Resistance	Resists pitting, chloride stress corrosion, and high-temperature oxidation. Avoid strong acids (e.g., HNO₃).
Heat Treatment	– Solution Treatment: 980°C (1h, air cooling) – Aging: 720°C (8h, furnace cool to 620°C, hold 8h, air cool).
Surface Finishes	Annealed & Pickled, Cold-Drawn, Polished (Ra ≤0.8μm), or Hot-Finished.
Pipe Dimensions	– Outer Diameter (OD): 6mm–300mm (Seamless) – Wall Thickness: 0.5mm–25mm – Length: 1000mm–12000mm (customizable).
Key Applications	Aerospace fuel nozzles, nuclear reactor coolant pipes, oil/gas downhole tubing, chemical processing reactors, and high-pressure hydraulic systems.

Inconel 718 Alloy Pipe (Ni-Cr-Fe-Nb Alloy) Applications

Industry	Critical Use Cases	Inconel 718 Pipe Advantage
Aerospace	Jet engine fuel lines, turbine exhaust ducts	1,275 MPa yield strength at 650°C for 20,000+ flight cycles.
Oil & Gas	Subsea wellhead piping, sour gas injection lines	Resists H₂S/CO₂ corrosion at 200°C (392°F) + 25,000 psi.
Nuclear	Reactor coolant channels, control rod housings	Immune to neutron embrittlement and stress corrosion cracking (SCC).
Energy	Gas turbine fuel nozzles, steam valve components	Withstands creep deformation at 700°C (1,292°F).

Inconel 718 Alloy Pipe (Ni-Cr-Fe-Nb Alloy) Product Packaging

Inconel 718 Alloy Pipe (Ni-Cr-Fe-Nb Alloy) (UNS N06625/N07718, ASTM B705/ASME SB-705 compliant) are engineered for critical applications in aerospace propulsion, nuclear reactors, and subsea oil & gas systems (operating up to 1,200°C). To safeguard their metallurgical integrity and dimensional precision during global transit, we deploy aerospace-certified packaging systems and thermal-controlled logistics compliant with AMS 5581, NACE MR0175, and ISO 9328-3 standards.

Why Choose Us

Where Precision Meets Partnership，25 years of focus on metal material science，Not only a supplier, but also your engineering consultant，Fast and zero compromise，Sustainable trust cycle。

Inconel 718 Alloy Pipe (Ni-Cr-Fe-Nb Alloy) Shipping

Sea transport

40HQ container (loading capacity 28 tons) / bulk carrier (LCL minimum 1 ton)

Air transport

reach major airports around the world within 7 days (DDP/DAP terms)

Land transport

door-to-door within China (qualification for dangerous goods transportation)

Our Services

We guarantee global door-to-door delivery within 7–15 business days via partnerships with DHL, Maersk, and UPS.

FAQ

Q1: How does Inconel 718 compare to Waspaloy in high-temperature performance?

A: Inconel 718 offers 30% higher yield strength at 700°C and superior weldability, while Waspaloy excels in higher creep resistance above 700°C.

Q2: What aging treatment optimizes mechanical properties?

A: Solution anneal at 955–980°C (1,750–1,800°F) for 1h, air cool, then age at 720°C (1,328°F) for 8h and 620°C (1,148°F) for 8h to achieve AMS 5663 specs.

Q3: Are pipes certified for aerospace turbine components?

Full compliance includes: