PROBLEM TO BE SOLVED: To provide a multistage continuous carburizing and quenching furnace and a continuous carburizing and quenching method for obtaining uniform and high-quality carburizing and quenching with excellent productivity while keeping dimensional accuracy.;SOLUTION: A carburizing zone 11, a diffusing zone 12 and a temperature lowering zone 13 are arranged in sequence in a furnace, and the inside of the furnace is segmented into first to fourth stages of carburizing furnace areas I to IV by carry-in roller conveyers 14-1 to 14-4 and carry-out roller conveyers 15-1 to 15-4 of the first to fourth stages. Heat treatment pallets 50 each loaded with a metal material are sent to the carburizing areas I to IV at an interval corresponding to a quenching cycle in accordance with a preliminarily determined order of the carburizing furnace areas, and are subjected to uniform carburization in the carburizing furnace areas I to IV. The heat treatment pallets 50 from the temperature lowering zones 13-1 to 13-4 of the respective carburizing furnace areas I to IV in accordance with the order of the carburizing furnace areas are immersed in a quenching medium in a quenching zone 21 to carry out uniform quenching.;COPYRIGHT: (C)2006,JPO&NCIPI
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