Abstract: A method for manufacturing mechanical components made of spheroidal cast iron, comprising the following steps: providing a casting of a mechanical cast iron component with a percentage of pearlitic structure greater than 70%, having a carbon content comprised between 2.5% and 4.0%, a silicon content comprised between 1.5% and 3.5%, a manganese content comprised between 0.6% and 1.2%, a molybdenum content comprised between 0% and 1%, and a chromium content comprised between 0% and 0.5%; bringing the cast iron casting with a percentage of pearlitic structure greater than 70% to a temperature that is higher than the upper austenitization temperature (Ac3) for the time required to obtain a fully austenitic structure; performing a thermal treatment for interrupted quenching in a salt bath, comprising a step of cooling the mechanical components in a salt bath at a cooling rate that is higher than the critical rate and an isothermal holding step at a temperature comprised between 250° C. and 320° C.

Abstract: A method for manufacturing mechanical components made of spheroidal cast iron, comprising the following steps: —providing a casting of a mechanical component made of cast iron having a structure which is at least partially ferritic and has a carbon content ranging from 2.5% to 4.0% and a silicon content ranging from 2.0% to 3.5%; —bringing the cast iron casting having an at least partially ferritic structure to a temperature for partial austenitizing which is higher than the lower limit austenitizing temperature (Ac1) and lower than the upper limit austenitizing temperature (Ac3) for a time required to obtain an at least partially austenitic structure; —performing a thermal treatment for isothermal hardening at a temperature ranging from 250° C. to 400° C. in order to obtain a matrix which has at least partially a pearlitic-ferritic or perferritic structure.

Abstract: A method for manufacturing mechanical components made of spheroidal cast iron, comprising the following steps: -providing a casting of a mechanical component made of cast iron having a structure which is at least partially ferritic and has a carbon content ranging from 2.5% to 4.0% and a silicon content ranging from 2.0% to 3.5%; -bringing the cast iron casting having an at least partially ferritic structure to a temperature for partial austenitizing which is higher than the lower limit austenitizing temperature (Ac1) and lower than the upper limit austenitizing temperature (Ac3) for a time required to obtain an at least partially austenitic structure; -performing a thermal treatment for isothermal hardening at a temperature ranging from 250° C. to 400° C. in order to obtain a matrix which has at least partially a pearlitic-ferritic or perferritic structure.