The possibility to expand the base of raw materials for carbonization using more lower grade and noncoking coals has been examined. Plastometric indices of the parent coals (C = 79.0-87.2 wt% daf): x, shrinkage of coal and y, thickness of the thermoplastic layer were determined. It was established that the addition of I M HCl to coal increases the thickness of the thermoplastic layer (y) of gaseous (C = 82.7 wt% daf) and rich (C = 87.2 wt% daf) coals by 15-20% and the strength of the solid carbonized residue from 64 up to 84% and from 92 up to 94%, respectively. A comparative evaluation of gaseous (C = 82.2-82.7 wt% daf) coal according the degree of its restorativity is given. The strength of the coke is obtained from untreated gaseous coal and with HCl additive in the temperature region of carbonization of 450-800 degreesC. It is established that the greatest increase of coke strength takes place in the temperature region of 550-750 degreesC. Data of X-ray diffraction show that structural changes take place at coal carbonization.