Energy-conserving, fast-cooling heat treating furnace

摘要

A heat treating furnace includes a vessel formed by inner and outer spaced apart walls, there being a hollow jacket between the walls. During the heating cycle, a vacuum is maintained in the jacket to reduce heat loss from the vessel and to keep the outer wall cool to the touch. During the cooling cycle, liquid is circulated through the jacket to cool the inner wall and to cool quenching gas being circulated within the vessel.