Carbon steel is one of the most common materials used in the construction of a chassis because it is strong, and can be machined easily. Other materials such as aluminium can also be used to build a chassis because it is a lightweight metal, that is strong and durable, easily machined, low density which results in low weight, corrosion resistant, and has excellent thermal conductivity. All these properties make aluminium the perfect choice for the construction of a chassis.
Some race cars, high performance supercars and exotic sports cars use carbon fibre in their chassis. Carbon fibre is lighter than aluminium and stronger than carbon steel, yet it is not a metal and doesn’t suffer from corrosion.