Abstract: The present invention includes: a conveying mechanism (110) that conveys a workpiece (200) in the longitudinal direction; a supporting mechanism (120) that is arranged on the downstream side in the conveyance direction of the workpiece (200) from the conveying mechanism (110); and a heating mechanism (130) that is arranged on the downstream side in the conveyance direction of the workpiece (200) from the supporting mechanism (120) and heats the workpiece (200), in which the supporting mechanism (120) is formed to include support rolls (121) that abut on an outer surface of the workpiece (200) and each include a hollow structure (122) allowing a cooling medium to pass therethrough therein.

Abstract: A circulation apparatus recovers cooling fluid after the cooling fluid is used for quenching and supplies the cooling fluid to a defoaming bath. A laminar flow weir of a defoaming apparatus partitions the defoaming bath into laminar and shallow flow baths. The laminar flow weir is lower than a side wall of the laminar flow bath. Cooling fluid from the circulation apparatus is supplied to the laminar flow bath and the cooling fluid is poured into the shallow bath from the laminar flow bath along the laminar flow weir. A filter covers an opening in a bottom portion of the shallow bath. The liquid level height in the shallow bath is less than the height of the laminar flow weir. A supply bath accumulates cooling fluid that passes through the filter, and supplies the cooling fluid to a cooling apparatus that sprays the cooling fluid onto a metallic material.

Abstract: A circulation apparatus recovers cooling fluid after the cooling fluid is used for quenching and supplies the cooling fluid to a defoaming bath. A laminar flow weir of a defoaming apparatus partitions the defoaming bath into laminar and shallow flow baths. The laminar flow weir is lower than a side wall of the laminar flow bath. Cooling fluid from the circulation apparatus is supplied to the laminar flow bath and the cooling fluid is poured into the shallow bath from the laminar flow bath along the laminar flow weir. A filter covers an opening in a bottom portion of the shallow bath. The liquid level height in the shallow bath is less than the height of the laminar flow weir. A supply bath accumulates cooling fluid that passes through the filter, and supplies the cooling fluid to a cooling apparatus that sprays the cooling fluid onto a metallic material.