In the core components of jet engines or land-based gas turbines, many parts operate under extreme conditions. Material reliability is a primary concern for purchasing managers and design engineers. When fuel lines and hydraulic lines are exposed to temperatures up to 700°C (1292°F) and high-frequency vibrations, standard alloys typically exhibit the following problems:
Vibration-induced fatigue: Microcracks appear at joints or on the pipe walls.
Creep deformation: The pipe "stretches" or sags, leading to assembly interference.
Pressure rupture: Unable to withstand the high-pressure fluids during peak temperatures.
Our GH4169 high-temperature nickel alloy tubing is designed for structural integrity in these mission-critical turbine environments. Recognized globally as a replacement for Inconel 718, it sets the industry benchmark for industrial durability.
Request a quote and technical data sheet for GH4169 immediately
GH4169 (Inconel 718) Seamless Tubing for Turbine Engines
GH4169 (Inconel 718) Seamless Tubing for Turbine Engines
GH4169, equivalent to Inconel 718 (UNS NO7718) tubing, is a precipitation-hardening nickel-based superalloy tubing widely used in the aerospace and power generation industries for manufacturing seamless steel tubing for turbine engines. Due to its high tensile strength, fatigue strength, and creep rupture resistance at temperatures up to 700°C (1300°F), it is a standard material for critical hot-end components.
What are the disadvantages of Inconel 718?
Disadvantages and alternatives of Inconel 718
While Inconel 718 boasts excellent mechanical and corrosion resistance properties, it also has some drawbacks: High cost: Due to its complex manufacturing process, Inconel 718 is expensive. Difficult to process: Its high hardness makes material removal difficult and accelerates tool wear.
1. GH4169 seamless tube Chemical Composition (%)
| Element | Ni | Cr | Nb (Niobium) | Mo | Ti | Al | Fe |
| Spec | 50.0-55.0 | 17.0-21.0 | 4.75-5.50 | 2.80-3.30 | 0.65-1.15 | 0.20-0.80 | Balance |
2. Mechanical properties of GH4169 seamless tube
GH4169 is a precipitation-hardening superalloy. Its properties are primarily driven by the γ′′ (γ′′) phase, which ensures that the material maintains its stiffness and strength even when heated.
GH4169 Technical Specifications (Standard Aging Condition):
| Temperature (℃/°F) | Yield Strength σp0.2 (MPa) | Tensile Strength σb (MPa) | Elongation (%) |
| 20°C (Room) | ≥ 1030 | ≥ 1240 | ≥ 12 |
| 650°C (1200°F) | ≥ 850 | ≥ 1000 | ≥ 15 |
| 700°C (1292°F) | ≥ 750 | ≥ 950 | ≥ 18 |
Our tubing is manufactured using a VIM + VAR (double melt) process to ensure ultra-low impurity content, which is key to maximizing the fatigue life of rotating turbine components.
Click to download the GH4169 alloy PDF file now
3. GH4169 standard compliance
Aviation: AMS 5589, AMS 5590.
Industrial: ASTM B637, ASTM B670.
International Equivalent: Inconel 718, UNS N07718, W.Nr. 2.4668.
4. GH4169 Tube Applications
As a reliable supplier, Gnee Steel offers the following GH4169 solutions:
Aircraft Engine Fuel Lines: For delivering high-temperature, high-pressure aviation fuel.
Hydraulic Actuator Lines: Precision lines for flight control systems.
Exhaust Manifolds: Resistant to thermal fatigue and oxidation.
Turbine Fasteners and Rings: Custom-made thick-walled tubing for structural components.
Why choose to source GH4169 seamless steel pipes from Gnee Steel?
✅️Direct Factory Pricing: Benefit from Wholesale Pricing on premium superalloys.
✅️MTC 3.1 Traceability: Every order includes a complete Mill Test Certificate and NDT reports (Ultrasonic & Eddy Current testing).
✅️Precision Fabrication: We offer h8-h11 tolerances and Cut-to-Length services for ready-to-install fuel lines.
✅️Fast Global Shipping: We maintain an extensive In-Stock Inventory of Sch 40 and Sch 80 seamless pipes.
Gnee Steel GH4169 Certificate
📦 Packaging and Shipping
All Nickel Based Alloy products are packaged using the following methods:
Wooden pallets or crates
Moisture-proof packaging
Labels with furnace number, standard, and size labels
Shipped worldwide by sea, air, or express
Gnee Steel GH4169 Product Packing
Contact us for the latest export price quote for GH4169 Alloy
FAQ
Q1: Is GH4169 identical to Inconel 718 for turbine service?
A: Yes. GH4169 is the designation used in Chinese national standards (GB/T 14992) and is chemically and mechanically identical to Inconel 718. It is used as a direct replacement in international turbine blueprints.
Q2: How do you prevent "Weld Decay" in welded GH4169 pipes?
A: We specialize in Seamless Tubing, which eliminates the weld seam risk. If welded pipes are required for large-diameter ducting, we perform a mandatory Double-Aging Heat Treatment to restore structural integrity to the weld zone.
Q3: Can GH4169 handle cryogenic fuel as well as turbine heat?
A: Absolutely. One of the reasons GH4169 is a "superalloy" is its versatility. It maintains toughness down to -253°C, making it ideal for rocket engine fuel systems (Liquid Hydrogen/Oxygen).
Q4: What is the lead time for custom-size aerospace tubing?
A: We have standard schedules In Stock for immediate dispatch. Custom-drawn sizes typically have a lead time of 4-6 weeks with a flexible low MOQ.
