GH3039 Alloy

GH3039 is an Fe-Ni-Cr-based solid solution strengthened wrought superalloy, primarily reinforced by the synergistic solid solution effect of chromium and molybdenum. It exhibits excellent high-temperature oxidation resistance, superior thermal corrosion resistance, and stable mechanical properties at both room and elevated temperatures, enabling long-term reliable operation in harsh high-temperature environments ranging from 850℃ to 1050℃. This alloy is widely applied in high-end manufacturing industries with strict requirements for material heat resistance and corrosion resistance, especially in scenarios involving continuous high-temperature exposure, corrosive media, 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 GH3039 is approximately 8.30g/cm³, which is slightly higher than that of GH3030 but still within the conventional range of Fe-Ni-Cr-based superalloys. This characteristic allows for flexible weight design of high-temperature components (such as medium-thickness furnace tubes and structural brackets), balancing load-bearing capacity and equipment lightweight requirements.
2. Thermal Properties:

◦ Melting temperature range: 1430-1490℃. The high and stable melting temperature range ensures the alloy maintains structural integrity without melting or severe softening under long-term ultra-high-temperature working conditions, providing a reliable material foundation for high-temperature applications such as aero-engine combustion chamber parts and chemical reactor cores.

◦ Thermal expansion coefficient: It measures about 12.5×10⁻⁶/℃ in the 20-100℃ range, and increases moderately to approximately 14.8×10⁻⁶/℃ when heated to 20-900℃. The gradual and stable change in thermal expansion coefficient minimizes thermal stress caused by rapid temperature fluctuations, significantly enhancing the alloy’s resistance to thermal fatigue cracking—critical for components undergoing cyclic heating and cooling (e.g., heat exchanger tubes and exhaust manifolds).

◦ Thermal conductivity: At 100℃, the thermal conductivity is around 15.5W/(m・K); at 900℃, it rises to roughly 22.8W/(m・K). The temperature-dependent increase in thermal conductivity promotes efficient heat transfer and dissipation in high-temperature components, avoiding excessive localized heat accumulation and subsequent degradation of material mechanical properties, thus extending the service life of parts.

1. Mechanical Properties (After standard heat treatment: 1100-1150℃ solid solution, air cooling):

◦ Yield strength (σ₀.₂, room temperature): ≥580MPa. This high yield strength enables the alloy to effectively resist plastic deformation under normal-temperature static loads, ensuring structural stability of components such as medium-load high-temperature fasteners and pressure-bearing sheet metal parts.

◦ Tensile strength (σᵦ, room temperature): ≥650MPa. The excellent tensile strength allows the alloy to withstand complex external forces (e.g., tension, pressure, and bending) in engineering applications, meeting the load-bearing requirements of key medium-temperature parts in chemical equipment and aerospace systems.

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

◦ High-temperature mechanical properties (at 900℃): The yield strength is ≥250MPa, the tensile strength is ≥320MPa, and the elongation is ≥15%. Even in high-temperature environments close to its service limit, it maintains sufficient strength and ductility, fully satisfying the long-term use demands of components such as high-temperature furnace tubes, turbine outer rings, and high-pressure steam pipes.

1. Magnetic Properties: GH3039 exhibits non-magnetic characteristics across its entire service temperature range (room temperature to 1050℃). 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

Leveraging its excellent comprehensive high-temperature performance, especially superior thermal corrosion resistance compared to GH3030, GH3039 alloy has become a key material in medium-to-high temperature high-end equipment manufacturing, with core application products including:

• Aerospace Field: It is mainly used to manufacture medium-load high-temperature components such as aero-engine combustion chamber casings (inner layers), afterburner barrels, and high-temperature air ducts. These parts operate in environments with high-temperature (700-1000℃), high-pressure gas, and fuel erosion; GH3039’s oxidation resistance and thermal stability ensure long-term stable operation. It is also applied in the thermal protection structures of aerospace vehicles, such as high-temperature brackets and heat shield panels in the propulsion system, and can be used as a substitute for GH3030 in more demanding thermal environments.
• Energy Field: In thermal power plants, it is used to produce high-temperature superheater tubes (auxiliary sections) and high-pressure steam headers, which withstand long-term exposure to high-temperature (450-600℃) and high-pressure steam. The alloy’s thermal stability and corrosion resistance extend the service life of equipment by 30% compared to conventional materials. In solar thermal power generation, it is utilized for manufacturing high-temperature heat absorber tubes of tower-type solar collectors, resisting high-temperature (up to 550℃) and outdoor environmental corrosion (e.g., UV radiation and sand erosion).
• Chemical Industry Field: It is ideal for manufacturing high-temperature reactor liners, heating furnace tubes, and corrosive medium transmission pipes in chemical plants. These components operate at 600-1000℃ in the presence of aggressive corrosive media (e.g., acidic gases, high-temperature molten salts, and organic solvents); GH3039’s resistance to high-temperature corrosion ensures continuous, stable production, reducing maintenance costs by 35% and minimizing production interruptions. It is also widely used in the manufacturing of catalyst support grids and distillation tower internals in petrochemical refining processes (e.g., ethylene cracking units).
• Other High-Temperature Fields: In the metallurgical industry, it is used to make high-temperature furnace rolls and vacuum heat treatment furnace muffle tanks, withstanding long-term high-temperature oxidation (up to 1000℃) and mechanical wear. In the automotive industry, it is applied to high-performance turbocharger housings and exhaust manifolds for racing cars and heavy-duty trucks, resisting high-temperature (up to 900℃) exhaust gas corrosion and thermal fatigue. In the medical industry, it is used in the core components of high-temperature sterilization equipment, such as sterilization chamber liners and heating element sleeves, ensuring the cleanliness, corrosion resistance, and structural stability of the equipment interior. It also finds use in high-temperature test equipment, such as sample holders for material thermal corrosion testing and medium-load high-temperature fixture components, providing reliable material performance data for industrial research and development.