GH1131 Alloy

GH1131 is a nickel-based solid solution strengthened wrought superalloy, primarily reinforced by the solid solution effect of chromium, tungsten, and cobalt. It delivers exceptional high-temperature oxidation resistance, superior thermal fatigue resistance, and stable mechanical properties at elevated temperatures, enabling long-term reliable operation in harsh thermal environments ranging from 900℃ to 1100℃. This alloy is widely utilized in high-end manufacturing industries that demand rigorous material performance, especially in scenarios involving high-temperature corrosion and cyclic thermal stress. 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 GH1131 is approximately 8.48g/cm³, slightly higher than that of common Fe-Ni-Cr-based superalloys. This density characteristic requires consideration in weight optimization during structural design of high-temperature components, while its outstanding mechanical strength effectively offsets the impact of higher density on overall load-bearing performance.
2. Thermal Properties:

◦ Melting temperature range: 1460-1520℃. The high and narrow melting temperature range ensures the alloy maintains structural integrity without melting or severe softening even in short-term ultra-high-temperature conditions, providing a robust material foundation for extreme thermal applications.

◦ Thermal expansion coefficient: It measures about 11.6×10⁻⁶/℃ in the 20-100℃ range, and increases moderately to approximately 13.0×10⁻⁶/℃ when heated to 20-1000℃. The stable and gradual change in thermal expansion coefficient minimizes thermal stress caused by temperature fluctuations, significantly enhancing the alloy’s resistance to thermal fatigue cracking.

◦ Thermal conductivity: At 100℃, the thermal conductivity is around 14.5W/(m・K); at 1000℃, it rises to roughly 23.8W/(m・K). The temperature-dependent increase in thermal conductivity facilitates efficient dissipation of local heat in high-temperature components, preventing excessive localized heating and subsequent degradation of material performance.

1. Mechanical Properties (After solution treatment at 1180-1230℃ and water cooling):

◦ Yield strength (σ₀.₂, room temperature): ≥680MPa. This high yield strength enables the alloy to resist plastic deformation effectively under normal-temperature static loads, ensuring long-term structural stability of components.

◦ Tensile strength (σᵦ, room temperature): ≥780MPa. The excellent tensile strength allows the alloy to withstand complex external forces (e.g., tension, bending, and shear) in engineering applications, meeting the load-bearing requirements of critical high-temperature parts.

◦ Elongation (δ₅, room temperature): ≥35%. Good plastic deformation capacity simplifies processing via forging, rolling, and stamping into complex-shaped components, while reducing the risk of cracking during manufacturing.

◦ High-temperature mechanical properties (at 1000℃): The yield strength is ≥290MPa, the tensile strength is ≥360MPa, and the elongation is ≥18%. Even near its upper service temperature limit, the alloy retains sufficient strength and ductility, fully satisfying the long-term operational demands of high-temperature structural parts.

1. Magnetic Properties: GH1131 maintains non-magnetic characteristics across its entire service temperature range (room temperature to 1100℃). This property is critical for applications in magnetic field-sensitive environments, such as high-temperature components installed near electromagnetic induction systems, precision magnetic instruments, or nuclear magnetic resonance (NMR) equipment.

3. Application Products

Leveraging its exceptional comprehensive high-temperature performance, GH1131 alloy has become a key material in advanced high-temperature equipment manufacturing, with core application products including:

• Aerospace Field: As a critical material for advanced aero-engines and aerospace propulsion systems, it is mainly used to manufacture high-temperature hot-end components such as turbine blades (medium-pressure stages), turbine disks, and combustion chamber liners. These parts operate in harsh environments with high-temperature (above 950℃) and high-pressure gas 冲刷，and GH1131’s high-temperature strength and oxidation resistance ensure safe and stable engine operation. It is also applied in the thermal protection systems of hypersonic aircraft to resist aerodynamic heating.
• Energy Field: In thermal power generation, it is used to produce ultra-supercritical boiler tubes and high-temperature headers, which withstand long-term erosion by high-temperature (above 600℃) and high-pressure (above 30MPa) steam. The alloy’s heat resistance and corrosion resistance improve power plant thermal efficiency while extending equipment service life. In nuclear energy, it is utilized for manufacturing high-temperature heat exchange tubes in fast neutron reactors, resisting corrosion by high-temperature liquid metal coolants and neutron radiation.
• Petrochemical Field: It is ideal for manufacturing high-temperature cracking furnace tubes and reactor cores in ethylene production units. These components operate at 950-1050℃ in the presence of corrosive media (e.g., hydrocarbons, hydrogen, and acidic gases), and GH1131’s resistance to high-temperature corrosion and creep ensures continuous, stable cracking processes, reducing maintenance costs and production downtime.
• Other High-Temperature Fields: In the metallurgical industry, it is used to make high-temperature furnace rolls and heating elements in continuous annealing furnaces, withstanding long-term high-temperature oxidation and mechanical wear. In the semiconductor industry, it is applied to high-temperature process chambers for epitaxial growth equipment, maintaining process environment purity and stability. It also finds use in high-temperature test equipment, such as heating furnace linings for material performance testing machines.