GH1333 Alloy

GH1333 is a nickel-based precipitation-hardening wrought superalloy, primarily strengthened by the precipitation of γ’ phase (Ni₃Al, Ti, Nb) and supplemented by solid solution strengthening of chromium and tungsten. It exhibits exceptional high-temperature creep resistance, excellent thermal stability, and strong resistance to high-temperature oxidation and thermal corrosion, enabling long-term stable operation in harsh high-temperature environments ranging from 900℃ to 1100℃. This alloy is widely applied in high-end manufacturing industries with stringent requirements for material high-temperature performance, especially in scenarios involving long-term high-temperature load-bearing, cyclic thermal stress, and aggressive corrosive media. 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 GH1333 is approximately 8.35g/cm³, which is slightly higher than that of conventional nickel-based precipitation-hardening superalloys. This characteristic requires consideration in weight optimization during the structural design of high-temperature rotating components (such as turbine disks), while its outstanding high-temperature strength effectively offsets the impact of higher density on overall load-bearing efficiency.
2. Thermal Properties:

◦ Melting temperature range: 1380-1440℃. The stable and high 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 load-bearing applications such as aero-engine hot-end rotating parts.

◦ Thermal expansion coefficient: It measures about 11.6×10⁻⁶/℃ in the 20-100℃ range, and increases moderately to approximately 13.2×10⁻⁶/℃ when heated to 20-1000℃. The gradual and uniform 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 frequent cyclic heating and cooling (e.g., combustion chamber liners).

◦ Thermal conductivity: At 100℃, the thermal conductivity is around 14.8W/(m・K); at 1000℃, it rises to roughly 23.5W/(m・K). The temperature-dependent increase in thermal conductivity promotes efficient dissipation of local heat in high-temperature components, avoiding excessive localized heating and subsequent degradation of material mechanical properties, thereby extending the service life of key parts.

1. Mechanical Properties (After standard heat treatment: 1100-1140℃ solid solution + 820-860℃ aging for 12h, air cooling):

◦ Yield strength (σ₀.₂, room temperature): ≥800MPa. This high yield strength enables the alloy to effectively resist plastic deformation under normal-temperature static loads, ensuring long-term structural stability of components such as high-temperature fasteners and compressor disks (high-pressure stages).

◦ Tensile strength (σᵦ, room temperature): ≥950MPa. 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 in advanced aero-engines and industrial gas turbines.

◦ Elongation (δ₅, room temperature): ≥15%. The moderate plastic deformation capacity ensures the alloy can be processed into complex-shaped components via forging, rolling, and precision machining processes, while reducing the risk of cracking during manufacturing and assembly.

◦ High-temperature mechanical properties (at 1000℃): The yield strength is ≥450MPa, the tensile strength is ≥550MPa, and the elongation is ≥10%. More importantly, its creep rupture strength reaches ≥250MPa at 1000℃ for 1000h—far exceeding the performance of many similar alloys—fully satisfying the long-term high-temperature load-bearing demands of structural parts such as turbine blades (medium-pressure stages) and turbine disks.

1. Magnetic Properties: GH1333 exhibits weakly magnetic characteristics at room temperature; as the temperature rises to its service temperature range (900-1100℃), the magnetic property gradually fades to near non-magnetic. This feature makes it suitable for most industrial environments, and only when used near high-precision magnetic instruments (e.g., aerospace navigation sensors or nuclear reactor magnetic measurement devices) does its weak magnetic influence need to be evaluated and controlled.

3. Application Products

Leveraging its excellent comprehensive high-temperature performance, GH1333 alloy has become a core material in advanced high-temperature equipment manufacturing, with key application products including:

• Aerospace Field: As a critical material for advanced aero-engines and gas turbines, it is mainly used to manufacture high-temperature load-bearing and rotating components such as turbine disks (medium-pressure stages), turbine blades (low-to-medium pressure stages), high-temperature fasteners, and combustion chamber liners. These parts operate in harsh environments with high-temperature (above 950℃), high rotational speed (up to 15,000 rpm), and gas erosion; GH1333’s high-temperature creep resistance and oxidation resistance ensure safe and stable operation of the engine. It is also applied in the thermal protection system of hypersonic aircraft, such as high-temperature structural brackets and heat shield components in the propulsion system.
• Energy Field: In gas turbine power generation (especially combined cycle power plants), it is used to produce turbine rotor disks, combustion chamber support rings, and high-temperature heat exchanger tubes, which withstand long-term erosion by high-temperature (above 900℃) and high-pressure gas. The alloy’s thermal stability and creep resistance improve the efficiency of gas turbines (up to 58% for advanced combined cycle power generation) while extending the equipment’s service life to over 120,000 hours. In the nuclear energy field, it is utilized for manufacturing high-temperature structural parts in nuclear reactor secondary loop systems (e.g., steam generator tubes), resisting corrosion by high-temperature high-pressure steam and weak radiation.
• Petrochemical Field: It is ideal for manufacturing high-temperature centrifugal compressor impellers, high-temperature valve stems, and reactor inner liners in large-scale petrochemical plants. These components operate at 850-1050℃ in the presence of corrosive media (e.g., hydrocarbons, hydrogen sulfide, and high-temperature molten salts); GH1333’s resistance to high-temperature corrosion and creep ensures continuous, stable operation of the equipment, reducing maintenance costs by 35% and minimizing production downtime.
• Other High-Temperature Fields: In the metallurgical industry, it is used to make high-temperature rolling mill work rolls (for stainless steel hot rolling) and vacuum heat treatment furnace baskets, withstanding long-term high-temperature oxidation (up to 1050℃) and heavy mechanical load. In the marine engineering field, it is applied to high-temperature exhaust manifold components of large marine gas turbines, resisting the combined corrosion of high-temperature exhaust gas and marine salt spray. It also finds use in high-temperature test equipment, such as high-temperature creep test fixtures and thermal fatigue test specimens for material performance testing machines, providing reliable material performance data for industrial research.