A turbocharger is a device that increases the intake pressure and power of an engine by converting exhaust airflow into mechanical energy. Turbochargers are usually composed of high-temperature, high-pressure, and high-speed airflow, so their materials must have characteristics of high temperature resistance, corrosion resistance, and high strength.

The most important components in a turbocharger are the turbine impeller and compressor impeller, which are usually made of high-temperature alloy steel. High temperature alloy steel is a special alloy material with good high-temperature strength and corrosion resistance, which can withstand the effects of high-temperature airflow and high-speed rotation.

Other components of turbochargers, such as bearings, shaft sleeves, turbine shafts, compressor shafts, etc., are usually made of high-strength steel or titanium alloy. Steel has good strength and stiffness, which can withstand the high-speed rotation of turbochargers; Titanium alloy has the advantages of good corrosion resistance and light weight, which can reduce the overall weight of turbochargers.

The casing of a turbocharger is usually made of cast or forged aluminum alloy. Aluminum alloy has excellent strength, rigidity, and corrosion resistance, while also being lightweight, which can reduce the weight of the entire turbocharger.

In summary, the material of the turbocharger must have characteristics of high temperature resistance, corrosion resistance, and high strength to ensure its normal operation in high temperature, high pressure, and high-speed airflow environments, and to provide stable turbocharging effects.