Vacuum Hardening Of Tool Steels
Hardening is a process in which steel parts are heated (at a controlled rate) untill the austenitic crystal phase is attained and is then quickly cooled (quenched) by introducing a suitable gas. The rate of quenching dependent on the Time-Temperature-Transformation (TTT) and Continuous Cooling Transformation CCT diagrams. An acceptable rate, for example is 28°C per minute. NATIONAL HEAT TREAT has 2 furnaces capable of performing this process.