GH1040 Alloy

GH1040 is an Fe-Ni-Cr-based solid solution strengthened wrought superalloy, whose performance is mainly enhanced by the solid solution effect of key elements such as chromium, nickel, and molybdenum. It exhibits excellent high-temperature oxidation resistance, good thermal stability, and reliable mechanical properties, enabling long-term stable operation in high-temperature environments ranging from 850℃ to 1050℃. This alloy is widely used in industries that have strict requirements for material heat resistance, corrosion resistance, and structural durability. 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 GH1040 is approximately 8.30g/cm³, which falls within the conventional density range of Fe-Ni-Cr-based superalloys. This characteristic facilitates accurate weight calculation during the structural design of high-temperature components, helping to balance the needs of equipment lightweight design and load-bearing capacity.
2. Thermal Properties:

◦ Melting temperature range: 1420-1480℃. The wide and high melting temperature range ensures that the alloy does not melt or undergo significant plastic deformation under harsh high-temperature working conditions, providing a reliable material guarantee for withstanding extreme thermal environments.

◦ Thermal expansion coefficient: It is about 11.8×10⁻⁶/℃ in the temperature range of 20-100℃, and increases to approximately 13.3×10⁻⁶/℃ when the temperature rises to 20-900℃. The stable change trend of the thermal expansion coefficient helps reduce thermal stress caused by temperature fluctuations, thereby minimizing the risk of component deformation or cracking due to thermal fatigue.

◦ Thermal conductivity: At 100℃, the thermal conductivity is around 15.0W/(m・K); when the temperature reaches 900℃, it increases to roughly 23.0W/(m・K). The gradual increase in thermal conductivity with temperature is beneficial for the rapid transfer of local heat in high-temperature components, avoiding excessive local temperature rise and subsequent degradation of material performance.

1. Mechanical Properties (After solution treatment at 1120-1170℃ and air cooling):

◦ Yield strength (σ₀.₂, room temperature): ≥560MPa. This high yield strength enables the alloy to effectively resist plastic deformation at normal temperature, ensuring the structural stability of components under static load conditions.

◦ Tensile strength (σᵦ, room temperature): ≥630MPa. The excellent tensile strength allows the alloy to withstand complex external forces such as tension and bending in engineering applications, meeting the load-bearing requirements of key components.

◦ Elongation (δ₅, room temperature): ≥32%. Good elongation endows the alloy with strong plastic deformation capacity, making it easy to be processed into components of various shapes through forging, rolling, and other processes, while reducing the probability of cracking during processing.

◦ High-temperature mechanical properties (at 900℃): The yield strength is ≥230MPa, the tensile strength is ≥300MPa, and the elongation is ≥16%. Even in high-temperature environments close to its service limit, the alloy can still maintain sufficient strength and plasticity, fully meeting the long-term use requirements of high-temperature structural parts.

1. Magnetic Properties: GH1040 remains non-magnetic in the entire service temperature range (from room temperature to 1050℃). This property makes it particularly suitable for applications in magnetic field-sensitive environments, such as high-temperature components installed near electromagnetic induction equipment, precision meters, or nuclear magnetic resonance-related devices.

3. Application Products

With its excellent comprehensive high-temperature performance, GH1040 alloy has been widely applied in multiple high-end manufacturing fields, and its core application products include:

• Aerospace Field: It is a key material for manufacturing high-temperature components of aero-engines, mainly used to produce combustion chamber components, afterburner inner casings, and high-temperature air ducts. These components are in a harsh environment scoured by high-temperature gas (above 900℃) for a long time, and the high-temperature strength and oxidation resistance of GH1040 can effectively ensure their safe and stable operation. Additionally, it is also used in the manufacturing of high-temperature structural parts for aerospace vehicles, such as heat-resistant brackets in the propulsion system.
• Energy Field: In thermal power plants, GH1040 is used to produce high-temperature superheater tubes, reheater tubes, and boiler header components. These components need to withstand the long-term erosion of high-temperature and high-pressure steam (with temperatures above 560℃ and pressures above 18MPa), and the excellent heat resistance and corrosion resistance of the alloy can significantly extend the service life of equipment while improving the thermal efficiency of power plants. In the nuclear energy field, it is applied to the manufacturing of high-temperature auxiliary heat exchanger components in nuclear reactor systems, resisting the corrosion of high-temperature coolants and the influence of weak radiation.
• Chemical Industry Field: It is suitable for manufacturing high-temperature reactor liners, heating furnace tubes, and chemical medium transmission pipelines in the chemical industry. These components often work in environments with high temperatures (up to 950℃) and corrosive media (such as acidic gases, high-temperature organic solvents, and molten salts), and the alloy’s resistance to high-temperature corrosion can ensure the continuous and stable operation of chemical production processes, reducing maintenance costs and production risks. Moreover, it is also used in the manufacturing of high-temperature cracking furnace tubes and catalyst support structures in the petrochemical industry.
• Other Fields: In the metallurgical industry, GH1040 is used to make high-temperature furnace rolls and heat-resistant guide rails in continuous annealing furnaces, withstanding long-term high-temperature oxidation and mechanical wear. In the automotive industry, it is applied to the manufacturing of high-temperature exhaust manifolds and turbocharger casings for high-performance commercial vehicles. In the medical industry, it is used in the core components of high-temperature sterilization cabinets and industrial-grade disinfection equipment, ensuring the reliability and stability of the sterilization process.