Definition - What does Graphitization mean?
Graphitization is the formation of graphite (free carbon) in iron or low-alloy steel, which occurs when their components are exposed to elevated temperatures over a long period.
The formation of graphite is due to the nucleation and growth process that occurs when the steel is exposed to temperatures above 800°F (1470°C). Graphite is a weak material with very low ductility and low resistance to thermal or mechanical fatigue or shock. Graphitization causes localized and weak areas on the affected steel component.