GH3030 Alloy

GH3030 is an Fe-Ni-Cr-based solid solution strengthened wrought superalloy, mainly reinforced by the solid solution effect of chromium. It possesses excellent high-temperature oxidation resistance, good thermal stability, and reliable room-temperature and high-temperature mechanical properties, enabling long-term stable operation in harsh high-temperature environments ranging from 800℃ to 1000℃. This alloy is widely applied in high-end manufacturing industries with strict requirements for material high-temperature oxidation resistance and processability, especially in scenarios involving continuous high-temperature exposure and moderate load-bearing. The following is a detailed breakdown of its chemical composition, physical properties, and application products.

1. Chemical Composition (Mass Fraction, %)

2. Physical Properties

1. Density: At room temperature, the density of GH3030 is approximately 8.0g/cm³, which is lower than that of most nickel-based precipitation-hardening superalloys. This characteristic is highly advantageous for weight optimization during the structural design of high-temperature components (such as thin-walled furnace tubes and sheet metal parts), helping to reduce the overall weight of equipment while ensuring load-bearing performance.
2. Thermal Properties:

◦ Melting temperature range: 1370-1420℃. The stable melting temperature range ensures the alloy maintains structural integrity without melting or severe softening under long-term high-temperature working conditions, providing a reliable material foundation for high-temperature applications such as chemical reactor liners and aero-engine combustion chamber parts.

◦ Thermal expansion coefficient: It measures about 13.5×10⁻⁶/℃ in the 20-100℃ range, and increases moderately to approximately 16.0×10⁻⁶/℃ when heated to 20-800℃. The relatively stable change in thermal expansion coefficient helps reduce thermal stress caused by temperature fluctuations, enhancing the alloy’s resistance to thermal fatigue cracking—critical for components undergoing cyclic heating and cooling (e.g., heat exchanger tubes).

◦ Thermal conductivity: At 100℃, the thermal conductivity is around 15.2W/(m・K); at 800℃, it rises to roughly 21.5W/(m・K). The temperature-dependent increase in thermal conductivity promotes efficient heat transfer in high-temperature components, avoiding excessive localized heat accumulation and subsequent degradation of material performance, thus extending the service life of parts.

1. Mechanical Properties (After standard heat treatment: 980-1020℃ solid solution, water cooling or air cooling):

◦ Yield strength (σ₀.₂, room temperature): ≥240MPa. This moderate yield strength enables the alloy to resist plastic deformation under normal-temperature static loads, ensuring structural stability of components such as low-load high-temperature fasteners and sheet metal structural parts.

◦ Tensile strength (σᵦ, room temperature): ≥520MPa. The reliable tensile strength allows the alloy to withstand moderate external forces (e.g., tension and pressure) in engineering applications, meeting the load-bearing requirements of non-critical high-temperature parts in chemical equipment and aerospace auxiliary systems.

◦ Elongation (δ₅, room temperature): ≥30%. The excellent plastic deformation capacity makes the alloy easy to process into complex-shaped components via rolling, bending, stamping, and welding processes, reducing the risk of cracking during manufacturing and improving production efficiency.

◦ High-temperature mechanical properties (at 800℃): The yield strength is ≥100MPa, the tensile strength is ≥190MPa, and the elongation is ≥20%. Even in high-temperature environments, it maintains good ductility and load-bearing capacity, fully satisfying the long-term use demands of components such as high-temperature exhaust pipes and low-pressure heat exchanger tubes.

1. Magnetic Properties: GH3030 exhibits non-magnetic characteristics across its entire service temperature range (room temperature to 1000℃). This feature makes it highly suitable for applications in magnetic field-sensitive environments, such as high-temperature components near electromagnetic induction equipment, precision magnetic instruments, and nuclear reactor magnetic measurement systems, without interfering with the normal operation of surrounding devices.

3. Application Products

Relying on its excellent high-temperature oxidation resistance and good processability, GH3030 alloy has become a widely used material in medium-temperature high-end equipment manufacturing, with core application products including:

• Aerospace Field: It is mainly used to manufacture non-load-bearing high-temperature components such as aero-engine combustion chamber casings (outer layers), high-temperature exhaust pipes, and aircraft auxiliary power unit (APU) heat exchanger tubes. These parts operate in environments with high-temperature (600-900℃) and gas erosion; GH3030’s oxidation resistance ensures long-term stable operation. It is also applied in the thermal insulation layers of aerospace vehicle cabins and high-temperature wire sheaths, providing reliable thermal protection.
• Energy Field: In thermal power plants, it is used to produce low-pressure heater tubes and high-temperature steam pipelines (auxiliary systems), which withstand long-term exposure to high-temperature steam (300-500℃). The alloy’s thermal stability and corrosion resistance extend the service life of equipment. In solar thermal power generation, it is utilized for manufacturing heat absorber tubes of parabolic trough solar collectors, resisting high-temperature (up to 400℃) and outdoor environmental corrosion.
• Chemical Industry Field: It is ideal for manufacturing high-temperature furnace tubes, reactor liners, and chemical medium transmission pipes in chemical plants. These components operate at 500-900℃ in the presence of corrosive media (e.g., acidic gases, organic vapors, and high-temperature molten salts); GH3030’s resistance to high-temperature corrosion ensures continuous, stable production, reducing maintenance costs by 25% and minimizing production interruptions. It is also widely used in the manufacturing of distillation tower internals and catalyst support grids in petrochemical refining processes.
• Other High-Temperature Fields: In the metallurgical industry, it is used to make heat treatment furnace muffle tanks and stainless steel annealing furnace conveyor belts, withstanding long-term high-temperature oxidation (up to 900℃) and mechanical wear. In the medical industry, it is applied to high-temperature sterilization equipment chambers and disinfection furnace inner liners, ensuring the cleanliness and corrosion resistance of the equipment interior. It also finds use in high-temperature test equipment, such as sample holders for material oxidation resistance testing and low-load high-temperature fixture components, providing a cost-effective material option for industrial research and development.