High-performance GH4169 alloy for extreme environments
GH4169 alloy (also known as Inconel 718 or N07718) is a high-performance precipitation-strengthened nickel-based superalloy designed for extreme environments. Due to its excellent high-temperature strength, corrosion resistance, and machinability, it is widely used in the aerospace, nuclear energy, and oil and gas industries.
What is the composition of GH4169 alloy?
The chemical composition of GH4169 alloy is as follows: Ni 53.44%, Cr 18.56%, Mo 3.02%, Nb 5.3%, Al 0.44%, Ti 1.04%, C 0.026%, P 0.005%, S 0.001%, B 0.002%, Fe balance (weight percentage).
Chemical composition of GH4169 alloy(%)
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 50.0 – 55.0 |
| Chromium (Cr) | 17.0 – 21.0 |
| Iron (Fe) | Balance |
| Molybdenum (Mo) | 2.8 – 3.3 |
| Niobium (Nb) + Tantalum (Ta) | 4.75 – 5.5 |
| Titanium (Ti) | 0.65 – 1.15 |
| Aluminum (Al) | 0.2 – 0.8 |
| Cobalt (Co) | ≤ 1.0 |
| Manganese (Mn) | ≤ 0.35 |
| Silicon (Si) | ≤ 0.35 |
| Sulfur (S) | ≤ 0.015 |
| Phosphorus (P) | ≤ 0.015 |
| Carbon (C) | ≤ 0.08 |
| Copper (Cu) | ≤ 0.3 |
| Boron (B) | 0.001 – 0.006 |
Key Mechanical Properties
GH4169 is highly regarded for its excellent mechanical properties over a wide temperature range.
| Property | Value |
|---|---|
| Tensile Strength | ~1380 MPa (200 ksi) |
| Yield Strength | ~1035 MPa (150 ksi) |
| Elongation at Break | ~12 – 18% |
| Hardness (HRC) | 30 – 45 (depending on heat treatment) |
| Operating Temperature Range | -250°C to +700°C |
Performance in Extreme Environments
High Temperature: Its primary strengthening mechanism lies in the formation of stable precipitates that resist coarsening at high temperatures, crucial for components such as turbine blades and turbine disks.
High Stress and High Pressure: GH4169 alloy is widely used in high-load components due to its high yield strength and ultimate tensile strength. Under expected operating conditions, it can withstand enormous mechanical stress and pressure without permanent deformation or failure.
Corrosive Environments: Its composition (nickel-chromium based alloy) forms a stable passivation layer, protecting the alloy from various corrosive media and high-temperature corrosion, such as molten salt corrosion in high-temperature gas environments.
Manufacturing Challenges under Extreme Machining Conditions: While the final product exhibits excellent performance, the alloy's properties (low thermal conductivity, high strength) make it difficult to machine, typically requiring advanced cutting tools and cooling technologies to prevent rapid tool wear. Modern additive manufacturing technologies also require precise control of process parameters to ensure optimal microstructure uniformity and mechanical properties.
Key Applications
Due to these properties, GH4169 alloy is the material of choice for critical components in the following fields:
Aerospace: Aircraft engine components, such as turbine disks, blades, and combustion chamber liners.
Power Generation: Gas turbines in onshore power plants.
Oil & Gas/Nuclear Energy: Various components in the oil and nuclear industries requiring resistance to high temperatures, high pressures, and corrosive media.
Why Choose Gnee Nickel Alloy (Supplier Example)?
✅ Large stock of GH4169 alloy tubes/bars/plates/fittings available for fast shipping.
✅ Factory direct sales, highly competitive prices, excellent value for money.
✅ Comprehensive quality assurance: Material Testing Certificate (MTC), Chemical Composition Certificate, and Mechanical Properties Certificate.
✅ Value-added services: Slitting, cutting, polishing, surface treatment.
✅ Worldwide shipping, secure and reliable packaging, and provision of export-required documents.
Email: ss@gneemetal.com
Gnee Steel is a supplier of GH4169 alloy, offering a wide range of products including: seamless pipe (sizes: 4-219 mm; thickness: 0.5-20 mm); welded pipe (sizes: 5.0-1219.2 mm; thickness: 0.5-20 mm); plates (thickness: 0.1 to 100 mm; width: 10-2500 mm); strips; alloy round bars (diameter: 3-800 mm); flat bars (thickness: 2-100 mm; width: 10-500 mm); hexagonal bars (size: 2-100 mm); wire rods; and extruded profiles. We collaborate with steel mills to provide our customers with GH4169 alloy products that meet or exceed numerous leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN, and BS standards.
Gnee Steel stocks and sells GH4169, pipes, plates, strips, round bars, flat bars, forged billets, hexagonal steel, wire rods, and extruded profiles. Please feel free to contact us at ss@gneesteel.com for a quote.
