Cast Iron

Cast iron, an iron-carbon alloy with carbon content exceeding 2%, has been fundamental to automotive manufacturing for over a century. Its excellent castability, vibration damping, wear resistance, and thermal properties make it irreplaceable in certain applications despite its weight. Gray cast iron remains the standard material for engine blocks and cylinder heads in many applications, offering superior vibration damping compared to aluminum, excellent machinability, and the ability to operate without cylinder liners. Its self-lubricating properties and heat retention characteristics are beneficial in engine applications. Ductile (nodular) cast iron, with spheroidal graphite structure, offers improved strength and ductility while retaining cast iron's beneficial properties. In braking systems, cast iron brake discs remain standard despite competition from carbon-ceramic alternatives. Cast iron's consistent friction properties, thermal stability, and cost-effectiveness ensure its continued use. The material's high heat capacity and thermal conductivity effectively manage the intense heat generated during braking, while its wear characteristics provide predictable performance throughout the disc's life.