It melts at 3727 C. The stable form of carbon at room temperature is Graphite which has a hexagonal crystal structure. (Top diagram) Diamond is metastable at room temperature and has a diamond cubic ...

The interstitial alloy between carbon and iron has a complex phase diagram ... body-centered cubic. Low carbon steel alloys have a composition close to the Eutectoid composition: Fe - 0.77 wt% C. The ...