The well carburizing furnace is a new type of energy-saving cycle operated heat treatment electric furnace, mainly used for gas carburizing of steel parts. Due to the use of ultra lightweight energy-saving lining materials and advanced integrated water-cooled furnace sealing fans, this series of carburizing furnaces has uniform furnace temperature, fast heating, good insulation, accelerated workpiece carburizing speed, uniform carbon potential atmosphere, uniform infiltration layer, and no leakage when the furnace pressure is increased, improving production efficiency and carburizing quality.