The metal production efficiency in the case of continuous casting mostly depends on mechanical properties of copper plates in casting mold. Experiments had been provided on oxygen-free copper specimens under conditions of high-temperature — 23–400 °С. The relations betwen mechanical properties of deformed specimens (15–85 % degree of stain) and temperature had been studied. The casting mold plates made of oxygen-free copper were shown to have best operating propeties being deformed by 20–25 % degree of stain.