Tubing is crucial in core components of aero-engine fuel systems and high-pressure hydraulic actuators. For aerospace procurement managers and engineers, the biggest challenges in sourcing GH4169 seamless tubing include:
Inconsistent wall thickness (poor concentricity): Uneven wall thickness leads to localized stress concentrations, potentially causing tubing to burst during high-pressure hydraulic cycles.
Grain size defects: Coarse grain structures significantly reduce the material's high-cycle fatigue life, leading to premature crack initiation.
Substitution risks: Using "commercial-grade" 718 alloy may not meet the purity requirements of the VIM+VAR dual-melting process needed for flight safety components.
At Gnee Steel, we eliminate these risks. As a dedicated Tier-1 supplier, Gnee Steel offers aerospace-grade GH4169 tubing designed for superior structural integrity.
Click to get a quote for GH4169 aerospace seamless tubing
AMS 5589 and AMS 5590 aerospace standard GH4169 (Inconel 718) seamless tubing
AMS 5589 and AMS 5590 aerospace standard GH4169 (Inconel 718) seamless tubing
AMS 5589 and AMS 5590 are aerospace standards for seamless, heat-resistant, and corrosion-resistant nickel alloy tubing made of Inconel 718 (GH4169/UNS N07718). These standards require the use of high-strength, precipitation-hardened tubing for high-stress aerospace/gas turbine applications (up to 1300°F/704°C), commonly found in jet engines, rocket engines, and cryogenic systems.
What are the AMS standards for INCONEL 718?
AMS 5596, AMS 5662, ASTM B637. UNS N07718 high-temperature alloy (UNS N07718) is stocked and manufactured in the following forms: bars, flat bars, wires, bulk coils, reels, plates, tubes, fittings, discs, and machined parts.
AMS 5589/5590 Inconel 718 Seamless Tubing Overview
Standards: AMS 5589 (often thin-wall), AMS 5590 (typically standard or heavy wall).
Material: Nickel Alloy 718 (UNS N07718, W.Nr 2.4668, GH4169).
Key Properties: Excellent tensile, creep, and rupture strength at elevated temperatures (up to 1300°F/704°C); excellent corrosion and oxidation resistance up to 1800°F.
Processing: Seamless, usually supplied in annealed or precipitation-hardened (aged) conditions.
Applications: Jet engine combustion chambers, rocket propulsion systems, gas turbines, cryogenic tankage, and high-pressure fluid lines.
Heat Treatment: AMS 5590 is often solution annealed (e.g., 1950°F) and then aged (precipitation hardened) to reach the required tensile properties.
1. GH4169 Seamless Steel Tube Technical Specifications
We have a large inventory of aviation-grade pipes available for wholesale and can ship at any time.
| Standard | Designation | Condition | Typical Application |
| AMS 5589 | Inconel 718 | Solution Treated | Aero-engine high-pressure fuel lines. |
| AMS 5590 | Alloy 718 | Bright Annealed | Precision hydraulic actuator tubing. |
| ASTM B637 | UNS N07718 | Fully Aged | High-strength fasteners & structural conduit. |
2. Mechanical properties of GH4169 seamless tube at 650°C (1200°F)
| Mechanical Performance at 650°C (1200°F) | Value |
|---|---|
| Yield Strength (0.2% Offset) | ≥ 850 MPa |
| Tensile Strength | ≥ 1000 MPa |
| Hardness | 36 – 44 HRC (After final aging) |
Click to download the GH4169 alloy PDF file now
3. AMS 5589 / AMS 5590 Comparison
AMS 5589 is typically used for thin-walled, high-precision hydraulic or fuel lines that require high stress fracture strength.
AMS 5590 is typically used for medium- to thick-walled lines in pressurized applications requiring higher structural strength and operating at higher temperatures.
Contact our professionals to recommend the right alloy for your project
4. GH4169 seamless steel pipe quality assurance
As an AS9100 Certified Manufacturer, we provide the documentation necessary to pass the most rigorous audits:
✅️100% NDT Inspection: Every single meter undergoes Ultrasonic Testing (UT) and Eddy Current Testing (ET).
✅️Hydrostatic Pressure Testing: Verified to withstand peak industrial pressure limits.
✅️MTC 3.1 Traceability: Full heat analysis and mechanical test reports included with every shipment.
✅️Surface Integrity: We guarantee a Smooth Finish (Ra ≤ 0.8μm) with zero surface oxidation.
Gnee Steel GH4169(inconel 718)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: What is the main difference between AMS 5589 and AMS 5590?
A: AMS 5589 specifies material in the solution-treated condition (Pickled finish), ideal for parts requiring further forming or welding. AMS 5590 is typically for Bright Annealed (BA) tubing, which offers a cleaner internal surface for hydraulic systems.
Q2: How do you guarantee the grain size requirement?
A: Through a combination of precise cold-reduction ratios and vacuum solution annealing at 940°C - 1010°C. Every batch is metallographically tested to confirm compliance with ASTM E112 Level 8+.
Q3: Can you provide GH4169 tubing with custom h-tolerances for actuators?
A: Yes. We offer centerless grinding and precision drawing to achieve h8, h9, or h10 tolerances for applications requiring an interference fit.
Q4: Do you support small-batch prototype orders?
A: Absolutely. We offer Flexible MOQs for aerospace R&D and prototype development in standard Sch 40 and Sch 80 sizes.
