Aviation-grade GH4169 Aircraft Engine Fuel Pipe

Gnee Super Alloy (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of aviation-grade gh4169 aircraft engine fuel pipe in China. If you're going to wholesale high quality aviation-grade gh4169 aircraft engine fuel pipe made in China, welcome to get free sample from our factory. Good service and reasonable price are available.

 

Aviation fuel systems allow for the utmost precision. Our Gnee Steel GH4169 fuel tubing is manufactured with precision processes to effectively prevent coking and withstand the intense pulsating pressures of modern turbines. We adhere to a strict zero-leakage policy, ensuring that every millimeter of tubing meets flight standards.

 

100% Traceability: Each batch comes with a Factory Test Certificate (MTC) corresponding to its furnace number.

Aerospace-Grade Cleanliness: Professional ultrasonic cleaning processes ensure that the tubing is free of oil, metal shavings, and microparticles.

High-Temperature Stability: Maintains structural integrity even under continuous operating temperatures up to 700°C (1300°F).

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Parameter	Description
Material	GH4169 (UNS N07718 / Inconel 718)
Product Form	Aviation Grade Seamless Tube – Aircraft Engine Fuel System
Wall Thickness	Thin wall – typically 0.020″ – 0.049″ (0.51 – 1.24 mm)
Design Requirements	High pressure fuel delivery, thermal stability, vibration resistance, fire resistance
Applicable Standards	AMS 5590, AMS 5589, ASTM B983, AS9100, FAA AC 43.13-1B
Typical Applications	Aircraft engine fuel manifold, fuel injection lines, fuel return lines, main fuel supply lines, high pressure fuel delivery systems

Note: GH4169 is widely used for aircraft engine fuel tubes due to its excellent combination of high strength, thermal stability, fatigue resistance, and corrosion resistance in fuel environments.

 

 

GH4169 seamless Tube Chemical Composition

Element	Composition (%)
Nickel (Ni)	50.0 – 55.0
Chromium (Cr)	17.0 – 21.0
Niobium (Nb) + Tantalum (Ta)	4.75 – 5.50
Molybdenum (Mo)	2.80 – 3.30
Titanium (Ti)	0.65 – 1.15
Aluminum (Al)	0.20 – 0.80
Cobalt (Co)	≤ 1.0
Iron (Fe)	Balance

 

Mechanical properties of GH4169 tube at high temperature

Temperature	Tensile Strength (Rm)	Yield Strength (Rp0.2)	Elongation (A5)	Hardness
650°C (1200°F)	≥ 1000 MPa	≥ 850 MPa	≥ 15 %	36 - 44 HRC

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OD (in)	OD (mm)	Wall (in)	Wall (mm)	Working Pressure (psi)	Typical Application
0.125	3.18	0.016	0.41	3,200	Pilot fuel lines, small engine control
0.125	3.18	0.020	0.51	4,200	Instrumentation, balance lines
0.188	4.78	0.020	0.51	2,800	Fuel return lines, low flow
0.188	4.78	0.028	0.71	4,200	Control lines, fuel metering
0.188	4.78	0.035	0.89	5,500	High pressure control
0.250	6.35	0.020	0.51	2,000	Fuel return, balance
0.250	6.35	0.028	0.71	3,000	Fuel supply, manifolds
0.250	6.35	0.035	0.89	4,000	High pressure supply
0.250	6.35	0.049	1.24	6,000	Extreme high pressure
0.313	7.95	0.028	0.71	2,400	Main fuel manifold
0.313	7.95	0.035	0.89	3,200	High flow supply
0.375	9.53	0.028	0.71	2,000	Main fuel lines
0.375	9.53	0.035	0.89	2,600	High pressure main supply
0.375	9.53	0.042	1.07	3,200	Large engine supply
0.500	12.70	0.035	0.89	1,900	Main fuel header
0.500	12.70	0.049	1.24	2,800	High flow / high pressure
0.500	12.70	0.065	1.65	3,900	Extreme duty
0.625	15.88	0.035	0.89	1,500	Large engine main feed
0.625	15.88	0.049	1.24	2,200	High volume supply
0.750	19.05	0.049	1.24	1,800	Large engine header
0.750	19.05	0.065	1.65	2,500	Heavy duty fuel system

 

The most commonly used fuel line size for GH4169

Rank	OD (in)	OD (mm)	Wall (in)	Wall (mm)	Usage Frequency	Typical Engine Type
1	0.250	6.35	0.035	0.89	Very High	Turbofan (CFM56, LEAP, PW1000G)
2	0.188	4.78	0.028	0.71	Very High	Turbofan control lines
3	0.375	9.53	0.035	0.89	High	Main fuel supply
4	0.250	6.35	0.028	0.71	High	Fuel supply, manifolds
5	0.500	12.70	0.035	0.89	Medium	Main fuel header
6	0.188	4.78	0.020	0.51	Medium	Return lines, low flow
7	0.125	3.18	0.020	0.51	Medium	Pilot fuel, instrumentation
8	0.313	7.95	0.035	0.89	Medium	High flow manifolds
9	0.500	12.70	0.049	1.24	Low	Extreme pressure systems
10	0.375	9.53	0.042	1.07	Low	Large engine supply

Contact us to customize GH4169 products to fit your project dimensions

 

 

GH4169 Fuel Pipe: Critical Success Factors

Oxidation & Coking Resistance: The high Chromium and Nickel content prevents fuel carbonization (coking) inside the tube, which can clog fuel nozzles and cause engine flameouts.

Thermal Fatigue Strength: Engineered to withstand rapid cooling and heating cycles during engine start-up and full-throttle afterburner engagement.

Superior Weldability: Designed for seamless integration with fuel manifolds using TIG or Orbital welding, ensuring high-strength joints that won't crack under vibration.

 

 

Fuel Manifold: The main and auxiliary fuel delivery rings of a jet engine.

Afterburner Injector: Injects fuel into the high-speed exhaust stream.

Nozzle Cooling Lines: Ensures fuel injectors are maintained within a safe operating temperature range.

Auxiliary Power Unit Fuel System: Provides a reliable fuel supply to the auxiliary power unit.

 

 

Gnee Alloy as a trusted supplier, Gnee Alloy adheres to a "zero-defect" principle. Every GH4169 seamless pipe undergoes a rigorous inspection process before shipment.

Stage	Process	Objective
Initial	VIM + ESR Melting	Ensure ultra-high purity & grain refinement
Forming	Multi-pass Cold Rolling	Achieve ultra-thin walls and tight tolerances
Treatment	Vacuum Annealing	Relieve stress without surface oxidation
Finishing	Precision Straightening	Ensure perfect alignment for aerospace assembly
Quality	100% Ultrasonic + Eddy Current	Guarantee zero defects in thin cross-sections

 

GNEE Group GH4169 superalloy Packaging

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✅️Aerospace Wholesale Prices: Significant cost advantages available for bulk production contracts.

✅️Direct from the Factory: Direct communication with our superalloy engineers for customized specifications.

✅️Global Export Leader: Extensive experience exporting certified aerospace components to Russia (compliant with Russian Federation Higher Education Committee (GOST) standards) and Western markets.

 GH4169 certificate

 

Q: Can you provide pre-bent fuel pipe assemblies?
A: While our core strength is manufacturing high-precision straight seamless tubes, we collaborate with certified aerospace fabrication partners to provide bent, flared, and end-fitted assemblies based on your CAD drawings.

 

Q: What is the maximum operating temperature for these fuel pipes?
A: GH4169 (Inconel 718) is exceptionally stable and maintains high mechanical strength up to 700°C (1300°F), making it the standard for "hot zone" fuel delivery.

 

Q: How do you guarantee the internal cleanliness of the fuel pipes?
A: We use a proprietary alkaline cleaning and deionized water rinsing process followed by vacuum drying. Every tube is capped at both ends immediately after inspection to prevent environmental contamination during transit.

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