For international purchasing managers and aerospace engineers using Boeing, Airbus, or GE design drawings, replacement reliability is a critical pain point. When a design specifies Inconel 718 alloy, but the supply chain provides GH4169 alloy, several crucial questions arise:
Does the Chinese-made GH4169 alloy meet the stringent chemical purity requirements of AMS 5662?
After double aging heat treatment, are its mechanical properties identical to Inconel 718 alloy?
Can the Factory Test Certificate (MTC) pass the rigorous aerospace quality audits?
At Gnee Alloy, we eliminate these risks. Our GH4169 bright bars are manufactured to globally recognized standards and are interchangeable with UNS N07718 alloy, ensuring the integrity of critical components.
Click to obtain the technical equivalent certificate and MTC sample
What is GH4169 (UNS N07718) Bright Rod Used for in the Aerospace Industry?
What is GH4169 (UNS N07718) Bright Rod Used for in the Aerospace Industry?
GH4169 (UNS NO7718) bright bar is a high-performance nickel-chromium-based superalloy widely used in the aerospace industry to manufacture critical high-stress components operating at extreme temperatures up to 700°C (1300°F). Due to its excellent tensile strength, creep resistance, and fatigue life, it is commonly used in the manufacture of jet engine gas turbines, compressor blades, fasteners, shafts, and rocket engine components.
What is GH4169 equivalent to?
Inconel 718
GH4169 is a high-strength, nickel-based superalloy primarily used in aerospace and high-temperature applications. It is equivalent to: Inconel 718 (USA) Alloy 718 (UNS N07718)
1. GH4169 (UNS N07718) Bright Rod description
| Parameter | Description |
|---|---|
| Material | GH4169 (UNS N07718 / Inconel 718) |
| Product Form | Aerospace Bright Bar |
| Surface Condition | Bright, oxide-free, high gloss |
| Manufacturing Process | Cold Drawn / Peeled / Centerless Ground + Bright Heat Treatment |
| Applicable Standards | AMS 5662, AMS 5663, ASTM B637, GE S400, PWA 1009 |
| Melting Process | VIM + VAR (double melt – mandatory) |
2. Physical properties of GH4169 aerospace-grade bright rods
| Property | Value | Significance |
|---|---|---|
| Density | 8.19 g/cm³ (0.296 lb/in³) | Weight calculation |
| Melting Range | 1260 – 1336°C (2300-2440°F) | Fire resistance margin |
| Thermal Conductivity (20°C) | 11.4 W/m·K | Heat dissipation |
| Thermal Conductivity (500°C) | ~16.0 W/m·K | High-temperature performance |
| Coefficient of Thermal Expansion (20-100°C) | 13.0 × 10⁻⁶/°C | Fitting compatibility |
| Coefficient of Thermal Expansion (20-600°C) | ~14.5 × 10⁻⁶/°C | High-temperature design |
| Specific Heat (20°C) | 435 J/kg·K | Thermal capacity |
| Specific Heat (600°C) | ~500 J/kg·K | High-temperature thermal capacity |
| Modulus of Elasticity (20°C) | ~200 GPa (29.0 × 10⁶ psi) | Stiffness |
| Modulus of Elasticity (600°C) | ~175 GPa (25.4 × 10⁶ psi) | Hot stiffness |
| Poisson's Ratio | 0.29 – 0.30 | Stress analysis |
| Electrical Resistivity | 1.25 µΩ·m | – |
| Magnetic Permeability | ~1.005 (slightly magnetic) | – |
Click to download the GH4169 alloy PDF file now
2. GH4169 bar technical specifications: "Fastener grade" standard
As a Tier-1 Supplier, our GH4169 is produced via the VIM + VAR (Double Melting) process to ensure an ultra-clean microstructure with zero non-metallic inclusions.
Standard Compliance: Fully compliant with AMS 5662 (Solution Treated) and AMS 5663 (Fully Aged).
Yield Strength (σp0.2): ≥ 1030 MPa (150 ksi).
Hardness: 36 - 44 HRC (After final aging).
Grain Size: Guaranteed ASTM E112 Level 8 or finer.
3. Main applications of GH4169 bright rods in the aerospace field
"Bright bar" refers to bar stock whose surface has been precision ground (usually with an h8-h11 tolerance), which is crucial for vibration resistance in automated CNC machining and high-speed assembly.
| Component Type | Why GH4169? | Surface Requirement |
| Aerospace Fasteners | Elite resistance to stress relaxation at 650°C. | h9/h10 Bright Ground for thread rolling. |
| Turbine Shafts | Exceptional High-Cycle Fatigue (HCF) strength. | Precision finish to eliminate stress initiators. |
| Fuel Injectors | Corrosion resistance and high-pressure stability. | Mirror Finish for zero-leakage sealing. |
| Structural Rings | Uniform grain structure prevents sagging. | Peeled or Bright finish for NDT inspection. |
4. Why buy from a certified manufacturer of superalloy Gnee Alloy?
✅️Global Compliance: Our material is a Cost-effective Solution that passes international audits without sacrificing Industrial Durability.
✅️Wholesale Pricing: Benefit from Direct Factory Price on bulk aerospace maintenance and production runs.
✅️100% NDT Testing: Every bright rod is Ultrasonic (UT) and Eddy Current tested to ensure zero internal voids.
✅️Fast Global Shipping: Optimized logistics for secure delivery to aerospace hubs in Europe, USA, and SE Asia.
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: Can GH4169 be used as a direct replacement for 2.4668 (NiCr19NbMo)?
A: Yes. GH4169 is the technical equivalent to the European grade 2.4668. Both materials conform to the same metallurgical strengthening mechanism (γ′′ phase) and are used interchangeably in global engineering.
Q2: Why is the "Bright" finish better than a "Peeled" surface for aerospace?
A: A Precision Ground Bright Finish ensures a smooth Ra ≤ 0.4μm surface. This eliminates microscopic surface defects that could lead to crack initiation under high-vibration engine environments, significantly extending the Material Life Cycle.
Q3: Is GH4169 suitable for cryogenic aerospace components?
A: Absolutely. One of the unique "Gene" traits of GH4169 is its exceptional toughness down to -253°C, making it the premier choice for liquid hydrogen fuel systems in space exploration.
Q4: Do you offer cut-to-length services for forged bars?
A: Yes. We provide specialized Custom Fabrication, including precision bandsaw cutting to provide ready-to-machine blanks, saving you material waste and labor costs.
