FIELD: metallurgy. SUBSTANCE: apparatus has casing provided with connecting pipes for supplying and discharging gas, ceramic pipe, heating unit made of fixed heater positioned inside the ceramic pipe and made of flexible current conducting jacket wherein blanks are received and movable additional heater mounted on the ceramic pipe and provided with a drive for moving them. The additional heater is made at least of two resistance member provided with independent leads for current supply. EFFECT: improved design. 2 cl, 1 dwg
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