GH4169 High-pressure Hydraulic Tube For Aviation Fluid Systems
As a leading supplier and manufacturer in China, GNEE Steel provides cost-effective nickel-based alloy products.
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Gnee Super Alloy (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of gh4169 high-pressure hydraulic tube for aviation fluid systems in China. If you're going to wholesale high quality gh4169 high-pressure hydraulic tube for aviation fluid systems made in China, welcome to get free sample from our factory. Good service and reasonable price are available.
Modern aerospace hydraulic systems operate under continuous pulsating pressure and extreme temperature gradients. Standard stainless steel tubing (such as 321 or 316L) experiences a significant decrease in strength above 500°C, while our GH4169 (Inconel 718) hydraulic tubing maintains its superior fatigue strength and structural integrity even in high-temperature hydraulic fluid environments reaching 600°C to 700°C.
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GH4169 High-pressure hydraulic tube for aviation fluid systems introduce
GH4169 (also known as Inconel 718) is a nickel-based high-temperature alloy tubing widely used in high-pressure hydraulic systems in aerospace fluid systems, especially in aircraft engines and high-pressure hydraulic actuators. It is chosen for its excellent strength, high-temperature fatigue performance, and superior corrosion resistance.
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High-pressure GH4169 Tube Description
| Parameter | Description |
|---|---|
| Material | GH4169 (UNS N07718 / Inconel 718) |
| Product Form | High Pressure Seamless Tube |
| Manufacturing Process | Cold Drawn / Cold Rolled (Pilgered) |
| Pressure Rating | Designed for high pressure service (up to 15,000+ psi / 1034+ bar) |
| Applicable Standards | ASTM B983, AMS 5589, AMS 5590, GB/T 14994, ASME Section VIII |
High-pressure hydraulic GH4169 Tube Specification
Chemical composition (mass percentage) of GH4169 hydraulic hose
Conforming to GB/T 14992 & AMS 5589 standards.
| Ni | Cr | Nb | Mo | Ti | Al | Fe | C |
| 50.0-55.0 | 17.0-21.0 | 4.75-5.50 | 2.80-3.30 | 0.65-1.15 | 0.20-0.80 | Bal. | ≤ 0.08 |
Mechanical properties of GH4169 hydraulic hose (at room temperature and high temperature)
Tested in Solution Annealed + Precipitation Hardened (Aged) condition.
| Condition | Tensile Strength (Rm) | Yield Strength (Rp0.2) | Elongation (A5) | Operating Temp |
| Room Temp | ≥ 1275 MPa | ≥ 1035 MPa | ≥ 12 % | -250°C to 700°C |
| At 650°C | ≥ 1000 MPa | ≥ 850 MPa | ≥ 15 % | Max 700°C |
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Common Dimensions of GH4169 Hydraulic Pipes
Custom sizes and ultra-thin walls are available upon request.
| Outer Diameter (OD) | Wall Thickness (WT) | Tolerance (OD) | Tolerance (WT) |
| 6.35 mm (1/4") | 0.5 mm - 1.0 mm | ± 0.05 mm | ± 10 % |
| 9.53 mm (3/8") | 0.7 mm - 1.2 mm | ± 0.05 mm | ± 10 % |
| 12.7 mm (1/2") | 0.8 mm - 1.5 mm | ± 0.08 mm | ± 10 % |
| 19.05 mm (3/4") | 1.0 mm - 2.0 mm | ± 0.10 mm | ± 10 % |
Contact us to customize GH4169 products to fit your project dimensions
Main Applications of GH4169 Pipe
GH4169 high-pressure hydraulic hoses are core components for aerospace hydraulic lines, piping systems, and aircraft engine fuel systems, where high pressure and reliability are critical.
GH4169 Non-destructive Testing (NDT) Requirements for Tubes
Gnee Alloy as a trusted supplier, Gnee Steel adheres to a "zero-defect" principle. Every GH4169 seamless pipe undergoes a rigorous inspection process before shipment.
Manufacturing Process & Quality Control
Our vertically integrated production ensures zero-defect tubing.
| Step | Process Description | Quality Control |
| Melting | VIM (Vacuum Induction) + ESR (Electroslag) | Chemical Analysis |
| Forming | Hot Extrusion + Multiple Cold Drawing | Dimensional Check |
| Cleaning | Ultrasonic Degreasing | Inner Surface Inspection |
| Heat Treat | Bright Annealing (BA) in Hydrogen | Microstructure Analysis |
| Testing | 100% Eddy Current & Hydrostatic | Leak-Proof Guarantee |
| Test Method | Requirement | Standard | Notes |
|---|---|---|---|
| Ultrasonic Testing (UT) | 100% (mandatory for heavy wall) | ASTM E213 | Longitudinal and transverse waves |
| Eddy Current Testing (ET) | 100% | ASTM E426 | Surface inspection |
| Hydrostatic Test | 100% | ASME Section VIII | Minimum test pressure per code |
| Liquid Penetrant Inspection (LPI) | As specified | ASTM E1417 | Surface crack detection |
| Visual Inspection | 100% | ASTM E543 | ID and OD inspection |
| Borescope Inspection | 100% | – | For small diameter heavy wall tubes |
GNEE Group GH4169 superalloy Packaging
GNEE Group GH4169 superalloy Packaging
Contact us to choose your preferred packaging and shipping method
Why Choose Gnee Steel's GH4169 Tubing?
As a leading exporter of GH4169 steel pipe, Gnee Steel provides comprehensive support for aerospace projects, from prototype to mass production.
✅️Wholesale Prices: Highly competitive pricing for large-scale aerospace and defense contracts.
✅️Global Logistics: Professional shipping services to Russia, Europe, and North America, fully compliant with customs regulations.
✅️Certifications: Each shipment comes with a Level 3.1 corrosion resistance test certificate and a non-destructive testing report.
GH4169 certificate
FAQ
Q: Do these tubes support orbital welding?
A: Yes. We strictly control the trace elements (like Sulfur and Phosphorus) in our GH4169 material, resulting in excellent weld pool stability. This makes our tubes perfect for automated orbital welding in modern aircraft assembly lines.
Q: What is the standard burst pressure for your 718 hydraulic tubes?
A: Burst pressure is a function of the Diameter-to-Wall ratio and the heat treatment condition. We can provide a specific burst pressure calculation report based on your required OD and Wall Thickness to ensure a 4:1 safety factor.
Q: Can you provide these tubes in a "Bright Annealed" state?
A: Absolutely. Most of our hydraulic lines are delivered with a Bright Annealed (BA) finish to ensure the interior is completely free of oxides and scales, preventing contamination of sensitive valves.
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