GH4090 is a Ni-Cr-Co-based precipitation hardening deformed high-temperature alloy with a service temperature of up to 920°C. The alloy has high tensile strength and creep resistance, good oxidation resistance and corrosion resistance at 815℃~870℃, and has high fatigue strength under repeated alternating effects of cold and heat.
GH4090 has good processing and welding properties. Suitable for making aerospace turbine engine turbine disks, blades, high-temperature fasteners, clamps, sealing rings and elastic components, etc. The main products are hot-rolled bars, cold-drawn bars, cold-rolled plates, strips and cold-drawn wires.
GH4090 has been used to make high-temperature spring components, high-temperature fasteners, combustion chamber clamps, stop pins and other parts of aero engines. Similar brands are also used abroad to make aero-engine turbine blades, turbine disks and other parts. GH4090 has good anti-oxidation and corrosion resistance below 1040℃, and is prone to intergranular oxidation above 1040℃.
GH4090 Composition content
Ni≤49.8%
Co：15.0%~21.0%
Cr：18.0%~21.0%
Ti：2.0%~3.0%
AI：1.0%~2.0%
Fe≤1.5%
Si≤0.8%
Mn≤0.4%
Cu≤0.2%
Zr≤0.15%
C≤0.13%
B≤0.02%
P≤0.02%
S≤0.015%
Pb≤0.002%
Bi≤0.0001%
Mechanical and Physical Properties
| Property | Test Temperature | Typical Value |
|---|---|---|
| Tensile Strength (Rm) | 20°C | ≥ 1080 MPa |
| 800°C | ≥ 735 MPa | |
| Yield Strength (Rp0.2) | 20°C | ≥ 695 MPa |
| 800°C | ≥ 590 MPa | |
| Elongation (A) | 20°C | ≥ 20% |
| Creep Rupture Strength | 900°C / 1000h | ~ 60 MPa |
| Hardness (HB) | 20°C | 310 - 400 |
Physical Properties:
Density: 8.18 g/cm³
Melting Range: 1315 - 1385°C
Coefficient of Thermal Expansion (20-100°C): 12.8 x 10⁻⁶ /°C
Thermal Conductivity (100°C): ~11.5 W/(m·K)
Processing and Fabrication Technology
Heat Treatment Regimen
Proper heat treatment is critical to unlock GH4090's full potential. The standard process involves:
Solution Treatment: Heating to 1080°C ± 10°C, holding for a sufficient time (depending on section thickness), followed by rapid cooling (air or oil quenching). This step dissolves the γ' formers (Al, Ti) into the matrix and adjusts the grain size.
Aging (Precipitation) Treatment: Reheating to 700°C - 750°C, holding for 16-24 hours, then air cooling. This controlled aging precipitates a fine, uniform dispersion of the γ' phase, providing optimal strength.
Critical Control: Precise temperature control during solution treatment is essential to avoid localized melting or excessive grain growth.
Forming and Machining
Hot Working: GH4090 is typically forged or rolled in the temperature range of 1100°C - 1150°C. It has good hot workability within this window but requires higher power equipment than conventional steels.
Machinability: It is considered difficult to machine, similar to other age-hardened superalloys. Recommendations include:
Using rigid machine setups and sharp, premium-grade carbide tools with specialized coatings (e.g., AlTiN).
Employing lower cutting speeds, moderate feed rates, and positive rake angles.
Utilizing high-pressure, copious coolant to control heat and improve tool life.
Welding Performance
GH4090 is weldable but requires strict procedures due to susceptibility to strain-age cracking in the heat-affected zone (HAZ).
Preferred Process: Gas Tungsten Arc Welding (GTAW/TIG).
Filler Metal: Use a matching composition filler wire or a compatible nickel-based superalloy wire (e.g., GH3030 or equivalent).
Pre- & Post-Weld Practice: Preheating (200-300°C) and a mandatory full post-weld heat treatment (solution + aging) are essential to restore properties and relieve stresses.
Applications and Industry-Specific Uses
Aerospace and Aviation
This is the primary application domain for GH4090.
Jet Engine Turbine Blades: Its flagship use is in high-pressure turbine blades and vanes, where it withstands extreme centrifugal loads and gas temperatures.
Combustion Chamber Components: Used in liners and flame holders due to its exceptional oxidation resistance and thermal fatigue strength.
Exhaust Systems: Employed in afterburner parts and thrust reverser components.
Power Generation
Gas Turbine Components: Used in land-based and marine gas turbines for power generation and mechanical drive, including blades, disks, and rings in the hot section.
Nuclear Reactors: Suitable for certain high-temperature core components and fastening systems due to its good radiation resistance and stability.
Industrial and Automotive
High-Temperature Furnace Fixtures: Used for trays, brackets, and radiant tubes.
Turbocharger Components: Applied in high-performance automotive and diesel turbocharger turbines.
Hot-Working Tooling: Occasionally used for dies and tools in high-temperature metal forming.
Our factory
Our factory is located in a major industrial hub in China, equipped with modern production facilities and a comprehensive quality management system. Covering an area of 25,000 square meters, the factory is outfitted with advanced smelting, forging, rolling, and precision machining production lines, specializing in the research, development, and manufacturing of nickel-based alloys, high-temperature alloys, and special copper alloys. We strictly adhere to the ISO 9001 quality management system and leverage laboratory equipment such as spectral analysis, metallographic testing, and mechanical property testing to ensure end-to-end quality control from raw materials to finished products. Additionally, the factory supports large-scale customized production capabilities, catering to the precision material needs of global clients in high-end sectors such as aerospace, energy and chemical engineering, and shipbuilding.
Product packaging
To ensure that our nickel-based alloy products (such as Hastelloy, Monel, and Inconel series) arrive in optimal condition for global customers, we employ an industrial-grade, multi-layered professional packaging solution:
Inner Layer Protection: Each piece of bar, plate, or tube is tightly wrapped with anti-rust oil paper/VCI film to effectively isolate moisture and prevent surface oxidation and corrosion.
Middle Layer Reinforcement: Customized foam corner protectors and waterproof stretch film are used to secure the products, preventing friction and collisions during transportation. Precision components are individually packed in blister trays or separate plastic boxes to ensure structural integrity.
Outer Layer Identification: Products are packaged in high-strength waterproof woven bags or wooden/steel crates, with clear product labels (material grade, dimensions, heat number, standard) and international shipping symbols (moisture-proof, upward, fragile, etc.) attached, complying with export packaging standards.
Full Traceability: Each batch includes a unique logistics barcode and quality certificate, enabling end-to-end traceability and ensuring transparent and reliable delivery.
We commit to providing comprehensive protection for every nickel-based alloy product from factory to your hands, guaranteeing consistent quality throughout.
