High-temperature alloy refers to a class of metal material based on iron, nickel, and cobalt and can work at high temperature under the action of 600℃ and certain stress; and has high-temperature strength, good oxidation resistance, and corrosion resistance, good fatigue performance, and fracture toughness. The alloys are a single austenitic tissue with good tissue stability and usage reliability at various temperatures.

Based on the above performance characteristics, and the high alloy degree of superalloy, also known as "superalloy", is an important material widely used in aviation, aerospace, petroleum, chemical industry, and ships. According to the matrix elements, the high-temperature alloy is divided into iron base, nickel base, cobalt-base, and other high-temperature alloys. Iron-based superalloy temperatures generally only reach 750 to 780℃, and for heat-resistant parts used at higher temperatures, a nickel-based, and the refractory metal-based alloy is used. Nickel-based superalloy occupies a particularly important position in the entire field of superalloy, which is widely used to manufacture Aerojet engines and various hottest end parts of industrial gas turbines.

The main application of the High-temperature alloy

1. Aerospace space field

Aero engines, known as the "flower of industry", are one of the most technical and difficult parts of the aviation industry. As an aircraft power engine, it is particularly important that the metal structure materials should have light quality, high strength, high toughness, high-temperature resistance, oxidation resistance, corrosion resistance, and other properties, which are almost the highest performance requirements in the structural materials.

A superalloy is a metal material capable of long-term working above 600℃ and under certain stress conditions. Hyperalloy was developed to meet the harsh requirements of modern aero-engines and has become an irreplaceable class of key materials for the thermal end parts of aero-engines. In advanced aero-engines, superalloy consumption has accounted for more than 50%.

In modern advanced aero-engines, superalloy materials account for 40% to 60% of the total engine volume. On aero-engine, superalloy is mainly used for four thermal section parts, combustion chamber, guide blade, turbine blade, and turbine discs, such as magazine, ring parts, afterburner, and tail nozzle.

2. Energy

Hypertemperature alloys are widely used in the energy field. In the high-parameter ultra-supercritical power generation boiler for coal power, Superheaters and superheaters must use good creep resistance, High-temperature alloy pipe with excellent oxidation resistance on the steam side and corrosion resistance on the flue gas side; In gas-electric gas turbines, Turbine blades and guide blades need the use of heat corrosion superalloy with excellent high-temperature corrosion resistance and long-term stable tissue; In the nuclear power sector, The steam generator must be a thermally with good corrosion resistance; In the field of coal gasification and energy conservation and emission reduction, Extensive use of high-temperature thermal corrosion resistance and high-temperature corrosion resistance performance of excellent high-temperature alloy; In oil and gas extraction, In particular, in deep wells, The rig is in an acidic environment of 4-150℃, together with CO2, The presence of H2S and sediment, etc. Corrosion-resistant wear-resistant thermally must be used.