GH4169 Seamless Pipe

Manufactured by hot extrusion from vacuum-induction-melted (VIM) and vacuum-arc-remelted (VAR) billet stock, GH4169 seamless pipe features a fully seamless structure without longitudinal weld seams or heat-affected zones.

The alloy achieves outstanding mechanical performance through γ'' (Ni₃Nb) and γ' (Ni₃(Al,Ti)) precipitation strengthening during a controlled aging process, delivering:

● Yield strength above 1034 MPa
● Service temperature capability up to 700°C
● Excellent creep resistance
● Superior fatigue strength
● Long-term structural stability under thermal cycling

These properties make GH4169 seamless pipe a preferred material for aerospace engines, gas turbines, nuclear systems, and high-pressure oilfield equipment.

Why Choose GH4169 Seamless Pipe?

Seamless Structure for Improved Reliability

Unlike welded nickel alloy pipe, GH4169 seamless pipe is produced through hot extrusion, forming continuous grain flow along the tube wall.
This manufacturing process eliminates potential weak points caused by welding and provides:

● No longitudinal weld seam
● No heat-affected zone
● Improved circumferential ductility
● Better resistance to pressure fluctuations and fatigue loading

For rotating equipment and high-temperature components exposed to thousands of operating cycles, this seamless structure provides enhanced service reliability.

Precipitation Hardening for High Strength

GH4169 obtains its exceptional strength through a carefully controlled heat-treatment process rather than simple alloy composition.
The typical process includes:

● Solution annealing at 950–980°C
● Aging at 720°C for 8 hours
● Controlled cooling to 620°C
● Secondary aging for 8 hours

This aging cycle creates strengthening precipitates throughout the material, achieving a balance of:

● High yield strength
● Good elongation
● Excellent creep resistance
● Stable performance at elevated temperatures

Ji Lai Da performs extrusion, solution treatment, and aging internally to maintain consistent quality and full traceability for every production lot.

Key Specification Parameters

Main Applications

1.Aerospace Industry

GH4169 seamless pipe is widely used in aircraft and aero-engine applications where strength retention at high temperatures is critical.

Typical applications include:
● Engine mounting frames
● Turbine casings
● Combustor liners
● Turbine shroud rings
● Afterburner components

The alloy maintains mechanical performance under continuous exposure to vibration, thermal cycling, and elevated operating temperatures.

2.Power Generation Industry

In industrial gas turbines, combustion-zone components operate under extreme thermal conditions where ordinary stainless steels cannot provide sufficient service life.

GH4169 is commonly selected for:
● High-temperature turbine components
● Combustion system parts
● Pressure-bearing structures

Its excellent fatigue and creep resistance support long-term operation measured in tens of thousands of hours.

3.Nuclear and Oil & Gas Applications

GH4169 seamless pipe is also used in demanding environments requiring high strength and corrosion resistance.

Applications include:
● Nuclear fuel channel brackets
● Control rod guide tubes
● HPHT wellhead equipment
● Downhole tools
● Subsurface safety valve housings

The material performs reliably under conditions involving high pressure, elevated temperature, hydrogen sulfide, and corrosive media.

Manufacturing Process and Quality Control

Jiangsu Ji Lai Da Nickel-Based Alloy Co., Ltd. produces GH4169 seamless pipe at its Wuxi facility using controlled manufacturing procedures from billet preparation to final inspection.

The production process includes: 1.VIM + VAR billet preparation 2.Hot extrusion forming 3.Solution annealing 4.Aging treatment 5.Ultrasonic inspection 6.Mechanical and dimensional testing

Each production lot is supplied with complete documentation, including:
● EN 10204 3.1 mill test certificate
● Chemical composition report
● Heat treatment record
● Mechanical testing results
● Inspection documentation

This traceability system allows aerospace, energy, and industrial customers to verify material quality throughout the entire supply chain.

Ordering Information

When requesting a quotation for GH4169 seamless pipe, customers should provide:
● Required diameter and wall thickness
● Applicable standard (GB/T, ASTM B670, AMS 5596, etc.)
● Operating temperature and pressure
● Heat treatment requirements
● Inspection specifications
● Required quantity

Ji Lai Da's technical team reviews each requirement before production to ensure the supplied GH4169 seamless pipe meets the required mechanical properties, dimensional tolerances, and application standards.

FAQ

Q: Is GH4169 the same as Inconel 718?

A: Yes. GH4169 is the Chinese designation under GB/T 14992 for the alloy known as Inconel 718 (UNS N07718) in the ASTM system. Chemistry and mechanical requirements are equivalent across both standards.

Q: Can GH4169 seamless pipe be used above 700 °C?

A: Extended service above 700 °C is not recommended because gamma-double-prime precipitates begin to coarsen, reducing long-term strength. For continuous operation above 700 °C, consider GH4145 (Inconel X-750) or GH4099 instead.

Q: Do you supply in the solution-annealed condition only?

A: Yes. Specify on your purchase order whether you need the aged condition or annealed-only. Jiangsu Ji Lai Da Nickel-Based Alloy Co., Ltd. can ship either, and the mill test certificate will reflect the actual condition supplied.

Q: What non-destructive testing is performed on GH4169 seamless pipe?

A: Ultrasonic testing per ASTM E213 and eddy-current inspection per ASTM E309 are standard on every lot. Additional testing methods can be arranged upon request when you place your order.