Turbocharger Housing: Unveiling the Secrets of Six Power-Packed Materials!

Currently, the main materials used for turbocharger housing are cast iron and cast steel, with six specific materials:

Cast Iron Materials Turbocharger Housing

  1. Gray Cast Iron: Contains alloying elements such as Cr, Ni, Si, which improve high-temperature fatigue performance and oxidation resistance. It operates at temperatures below 500°C.

    Gray cast iron is commonly used in turbocharger housings, cylinder blocks, cylinder heads, and gearbox bodies in automobiles.
  2. Ductile Iron: Also known as nodular cast iron, it controls the amount of pearlite in the iron matrix, reducing internal stress in the turbocharger housing and extending its lifespan. Ductile iron is suitable for working environments with temperatures below 650°C.

    It is used in turbocharger housings, crankshafts, rocker arms, front and rear wheel hubs, brake calipers, and other automotive components.
  3. Silicon Molybdenum Cast Iron: Contains alloying elements such as Si and Mo, which enhance the high-temperature and oxidation resistance of the cast iron. It can operate at a maximum temperature of 760°C.

    Silicon molybdenum cast iron is also used in some automotive exhaust manifolds.
  4. High-Nickel Austenitic Heat-Resistant Ductile Iron: Contains alloying elements such as Ni and Cr, providing high strength, hardness, and oxidation resistance. It can operate at a maximum temperature of 880°C.

    In automotive engineering, high-nickel austenitic heat-resistant ductile iron is used to manufacture crankshafts, cylinder blocks, exhaust manifolds, turbocharger housings, and other components that require high strength and wear resistance.

Stainless Steel Materials Turbocharger Housing

  1. Cast Austenitic Stainless Steel: Contains high levels of valuable elements such as Ni and W. It can operate at a maximum temperature of 1150°C.
  2. Cast Ferritic Stainless Steel: Contains 8% to 30% Cr and may have a small amount of Ni or no Ni at all. Its microstructure is ferritic, and it can operate at a maximum temperature of 950°C.

    Apart from turbocharger housings, most of the automotive exhaust systems are made of cast ferritic stainless steel, which is a major component in automotive stainless steel applications. Additionally, stainless steel is extensively used in automotive fuel tanks, car frames, heat exchangers, and various automotive accessories.