Cummins Engine Part Exhaust Manifold 4386606 For Cummins QSX15 Engine

Characteristics and requirements of exhaust manifold materials

With the advancement of engine technology, the structure of the exhaust manifold has become more complicated. In addition to working under cyclic alternating temperature conditions, the exhaust manifold material is required not only to have good high temperature performance, but also to have good casting performance.

1.Good high-temperature oxidation resistance: The gas manifold has been working under high-temperature cycling for a long time, and the oxidation resistance of the material at high temperatures directly affects the service life of the exhaust manifold. Ordinary cast iron obviously cannot meet the requirements, and alloying elements need to be added to the material to improve the high temperature oxidation resistance of the material.
2.Stable microstructure: In the range of room temperature to working temperature, the material should not undergo phase change or minimize phase change as much as possible. Because the phase change will cause volume changes, causing internal stress or deformation, affecting the product's performance and life. Therefore, the matrix material is preferably a stable ferrite or austenitic structure.
3.Small thermal expansion coefficient: a small thermal expansion coefficient is beneficial to reduce the thermal stress and thermal deformation of the exhaust manifold, and is beneficial to improve the performance and service life of the product.
4.Excellent high temperature strength: it must meet the necessary strength requirements when the product is used at high temperatures.
5.Good process performance and low cost: There are many types of heat-resistant and high-temperature resistant metal materials, but due to the complex shape of the exhaust manifold, the material used to manufacture the exhaust manifold must have good manufacturability, and its cost must meet Demand for mass production in the automotive industry.