What are the performance advantages of the GH4169 alloy?
What are the performance advantages of the GH4169 alloy?
GH4169 (UNS N07718) is a high-quality precipitation-hardening nickel-based superalloy renowned for its exceptional strength and stability over a temperature range of -253°C to 650°C. It is commonly used in the aerospace industry due to its high yield strength. Its key advantages include excellent fatigue resistance, good corrosion/oxidation resistance, good weldability, and high structural reliability even at extreme high temperatures.
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 Material Overview
| Parameter | Description |
|---|---|
| Material | GH4169 (UNS N07718 / Inconel 718) |
| Material Type | Wrought Nickel-based Superalloy |
| Strengthening Mechanism | γ″ + γ′ precipitation hardening |
| Product Forms | Bar, forging, plate, tube, strip, wire |
| Typical Applications | Turbine discs, compressor blades, fasteners, shafts, high-temperature structural components |
| Maximum Service Temperature | 650 – 700°C (load-bearing) |
2. Chemical composition of GH4169 (wt%)
| Element | Content (%) | Function | |
|---|---|---|---|
|
|
Nickel (Ni) | 50.0 – 55.0 | Matrix element; high-temperature stability |
| Chromium (Cr) | 17.0 – 21.0 | Oxidation and corrosion resistance | |
| Iron (Fe) | Balance (~18-20) | Fe-Ni-Cr base alloy | |
| Niobium (Nb) | 4.75 – 5.50 | Core strengthening element – γ'' former (Ni₃Nb) | |
| Molybdenum (Mo) | 2.80 – 3.30 | Solid-solution strengthening; creep resistance | |
| Titanium (Ti) | 0.65 – 1.15 | γ' strengthening (Ni₃(Al,Ti)) | |
| Aluminum (Al) | 0.20 – 0.80 | γ' strengthening; oxidation resistance | |
| Carbon (C) | ≤ 0.08 | Low carbon for toughness | |
| Manganese (Mn) | ≤ 0.35 | Deoxidizer | |
| Silicon (Si) | ≤ 0.35 | Deoxidizer | |
| Phosphorus (P) | ≤ 0.015 | Ensures toughness | |
| Sulfur (S) | ≤ 0.015 | Ensures hot workability | |
| Boron (B) | 0.002 – 0.006 | Grain boundary strengthener | |
| Cobalt (Co) | ≤ 1.00 | Residual element | |
| Copper (Cu) | ≤ 0.30 | Residual element |
3. Mechanical properties of GH4169 at temperature (Fully Aged)
| Property | Room Temp (20°C) | Elevated Temp (650°C) | Why it Matters |
| Yield Strength | ≥ 1030 MPa | ≥ 850 MPa | Elite structural load. |
| Tensile Strength | ≥ 1240 MPa | ≥ 1000 MPa | Prevents pressure bursting. |
| Hardness (HRC) | 36 - 44 | - | Superior wear resistance. |
Standards Compliance:
Aerospace: AMS 5662 (bars), AMS 5596 (plates), AMS 5589 (tubes).
Industrial: ASTM B637, ASTM B670.
Traceability: Each order includes a complete MTC 3.1 rolling test certificate documenting grain size and thermal analysis results.
Click to download the GH4169 alloy PDF file now
4. GH4169 Core Performance Advantages
High Temperature Strength: At temperatures below 650°C, GH4169 is a leading anti-deformation alloy, maintaining structural integrity even under immense thermal and mechanical stresses.
Excellent Fatigue and Creep Properties: This alloy maintains high strength under cyclic loading (high-cycle fatigue), making it ideal for rotating engine components.
Corrosion and Oxidation Resistance: At high temperatures, GH4169 exhibits excellent oxidation and corrosion resistance, ensuring long-term performance and reducing maintenance.
Good Weldability and Machinability: Unlike many other high-temperature alloys, GH4169 possesses excellent weldability (e.g., brazing), making it suitable for manufacturing complex welded structures in aerospace and nuclear energy applications.
High Surface Integrity: After treatment (e.g., high-energy composite modification), GH4169 achieves high residual compressive stress and high surface hardness, thereby increasing its fatigue limit, sometimes even doubling it (e.g., from 215 MPa to 517 MPa in specific tests).
5. GH4169's main applications
Due to these properties, GH4169 accounts for over 30% of the materials used in some advanced engines, for the following components:
Aircraft engine components (rotors, airfoils).
Nuclear engineering structures.
Chemical processing components.
Why choose Gnee Alloy, a Tier 1 manufacturer?
✅️Factory Direct Pricing: Eliminate middlemen and markups to ensure the best wholesale prices.
✅️Custom Processing: We offer precision cutting, centerless grinding (H8-H11), and custom forging services.
✅️Global Logistics: Optimized logistics system for fast delivery to over 50 countries and regions worldwide.
Contact us now to get the latest export price for GH4169 in 2026
FAQ
Q1: Is GH4169 truly interchangeable with Inconel 718?
A: Yes. GH4169 is the technical equivalent used in international blueprints for UNS N07718. They share the same chemical DNA and mechanical thresholds.
Q2: Why is the VIM+VAR process mandatory for aerospace?
A: VIM+VAR (Double Melting) is the only way to ensure the level of metallurgical cleanliness required to prevent Macro-segregation (Freckles) in rotating turbine parts.
Q3: Can GH4169 handle sour gas (H2S) environments?
A: Absolutely. When heat-treated to specific NACE limits, our GH4169 is fully compliant with NACE MR0175, making it a staple for high-pressure oil and gas downhole tools.
Q4: Do you offer trial orders for prototype development?
A: Yes. We support R&D with Flexible MOQs on our standard wholesale inventory of rods, sheets, and tubes.
