Mechanical tools

. n ame four different types of surface hardening process . the purpose of case hardening . the purpose of carburising . the process of gas carburising Most of the components must have a hard, wear resisting surface supported by a tough, shock resisting core for better service condition and longer life. This combination of different properties can be obtained in single piece of steel by surface hardening. Types of surface hardening Case hardening Nitriding Flame hardening Induction hardening Surface hardening processes can be classified as -processes in which the whole component is heated, Eg. Case hardening and nitriding -processes in which only the surface of the component is heated Eg. Flame hardening and induction hardening Case hardening Parts to be hardened by this process are made from a steel with a carbon content of 0.15% so that they will not respond to direct hardening. The steel is subjected to treatment in which the carbon content of the surface layer is increased to about...