The transition to graphite of carbons containing sulfur and the effects of added iron and chromium on this process have been studied using X-ray diffraction analysis and electron microscopy. It was found that after heat treatment in the temperature interval 1300-1600°C carbons containing at least 1.5 mass% of sulfur, or 0.3 mass% of sulfur and 1.5 mass% of added Cr 2 O 3 become heterogeneous; they consist of an ultradisperse matrix and of large (> 100 nm) and sufficiently perfect (Δd/d 0 0 2 0.002) regions of coherent scattering with interlayer spacing d 0 0 2 that corresponds to the graphite-crystal structure. When disperse iron is added, the amount of the graphite phase in this temperature interval decreases by a factor of 2.