In high-risk engineering projects, the choice of materials determines the success or failure of the project. Never risk using "general-purpose" materials in critical areas.
While many alloy products offer "heat resistance," our Gnee Alloy GH4169 (equivalent to Alloy 718) is specifically designed and manufactured to maintain structural integrity in environments where standard stainless steel and lower-grade nickel-based alloys would soften and sag. Whether you're facing the scorching temperatures of a jet engine or the absolute zero temperatures of liquid hydrogen, we offer industrial-grade durability that meets your design specifications.
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Applications of GH4169 | Procurement Guide for Aerospace and Nuclear Energy Industries
Applications of GH4169 | Procurement Guide for Aerospace and Nuclear Energy Industries
GH4169 (also known as Inconel 718 or UNS N07718) is a precipitation-hardening nickel-based superalloy widely used in extreme high-temperature and high-pressure environments. It is characterized by excellent fatigue resistance, creep resistance, and corrosion resistance at operating temperatures up to 650°C to 700°C.
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. Chemical composition (wt.%) of GH4169
| GH4169(Inconel 718) | Element | Weight % |
|---|---|---|
|
|
Nickel (Ni) | 50 – 55 |
| Chromium (Cr) | 17 – 21 | |
| Iron (Fe) | Balance (Rest) | |
| Molybdenum (Mo) | 2.8 – 3.3 | |
| Niobium (Nb) | 4.75 – 5.5 | |
| Titanium (Ti) | 0.65 – 1.15 | |
| Aluminum (Al) | 0.2 – 0.8 | |
| Cobalt (Co) | ≤ 1 | |
| Manganese (Mn) | ≤ 0.35 | |
| Silicon (Si) | ≤ 0.35 | |
| Carbon (C) | ≤ 0.08 | |
| Phosphorus (P) | ≤ 0.015 | |
| Sulfur (S) | ≤ 0.015 | |
| Boron (B) | ≤ 0.006 | |
| Copper (Cu) | ≤ 0.3 |
2. GH4169 - UNS N07718 High Temperature Alloy Mechanical Properties
| Element | Yield Strength (0.2%Offset) | Melting Point | Density | Tensile Strength | Elongation |
| GH4169/718 | MPa – 1034 | 1336 °C (2437 °F) | 8.19 g/cm3 | MPa – 1241 | Min 10 % |
3. Physical properties of grade GH4169
| Property | Density kg/dm3 |
Temperature T °C/F |
Specific heat J / kgK |
Thermal conductivity W/mK |
Electric resistance µΩ·cm |
Modulus of elasticity kN/mm2 |
Expansion rate |
|---|---|---|---|---|---|---|---|
| 581 (≥) | 287 (≥) | 22 | 43 | 23 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 321 | |
| Temp. °C/°F |
Creep strain limit (10000h) (Rp1,0) N/mm2 |
Creep rupture strength (10000h) (Rp1,0) N/mm2 |
|||||
| 151 | 625 | 645 |
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Key Applications of GH4169
Aerospace Industry (Aircraft Engines and Rockets)
Turbine disks and compressor blades: Used in rotor components requiring high strength at high temperatures.
Structural components: Engine casings, combustion chambers, and afterburners.
Fasteners and tubing: High-pressure seamless tubing and high-strength fasteners that maintain integrity under cyclic loading.
Advantages: Our bars and forgings have yield strengths exceeding 1030 MPa and maintain their stiffness at 650°C, ensuring tolerances for rotating components are controlled within one-thousandth of an inch.
Nuclear Energy Industry
Reactor internals: Components in pressurized water reactors (PWRs) and fast neutron reactors requiring high radiation resistance.
Fuel assemblies: High-temperature structural elements within fuel assemblies.
Heat exchangers and piping: Components exposed to corrosive nuclear environments.
Other key applications
Industrial gas turbines: Components requiring creep resistance.
Petrochemical/Oil & Gas: Downhole tools and wellhead components requiring resistance to acid gases and corrosion.
Advantages: Our materials undergo special heat treatment to meet NACE MR0175 / ISO 15156 hardness limits, effectively preventing sulfide stress cracking (SSC).
7. GH4169 Application Selection Matrix
| Industry Sector | Critical Component | Technical Requirement | Our Material Solution |
| Aerospace | Turbine Discs & Shafts | High-Cycle Fatigue (HCF) | AMS 5662 / VIM+VAR |
| Fasteners | Aero-Engine Bolts | Stress Relaxation Resistance | AMS 5663 / Fully Aged |
| Oil & Gas | Downhole & Wellhead | H2S & Pitting Resistance | NACE MR0175 Compliant |
| Nuclear | Reactor Core Supports | Radiation & Thermal Stability | High-Purity Forged Bar |
| Cryogenics | Liquid H2 / O2 Tanks | Impact Toughness at -253°C | Seamless Tubing |
8. Why choose Tier 1 supplier Gnee Alloy?
✅️Zero-Risk Substitution: Our GH4169 is the direct technical equivalent to Inconel 718 and UNS N07718, globally accepted in international blueprints.
✅️Wholesale Pricing: Benefit from Direct Factory Price on bulk tonnage for large-scale energy and defense projects.
✅️MTC 3.1 Traceability: Full heat analysis and mechanical verification provided with every shipment.
✅️Custom Fabrication: We offer precision cutting, centerless grinding, and specialized thermal treatment to match your assembly line.
Contact us now to get the latest export price for GH4169 in 2026
FAQ
Q1: Is GH4169 the most cost-effective solution compared to Inconel 625?
A: If your application requires high yield strength and fatigue resistance, Yes. While 625 is excellent for corrosion, it lacks the precipitation-hardening strength of 718. Using 718 allows for thinner, lighter designs with a higher safety factor.
Q2: Can you provide GH4169 for high-vibration environments?
A: Absolutely. By utilizing the VIM+VAR process, we eliminate the non-metallic inclusions that initiate fatigue cracks, ensuring our rods and tubes have the longest possible service life under vibration.
Q3: Does GH4169 meet nuclear safety standards?
A: Yes. We supply GH4169 that complies with ASME BPVC Section III and specialized nuclear codes for core structural members and high-strength springs.
Q4: Do you support small-batch prototype development?
A: Yes. As a Reliable Supplier, we support innovation by offering flexible MOQs on our Wholesale Inventory of standard sizes.
