回転炉床式加熱炉

Japanese Patent JP7192810

B2

To provide a rotary hearth type heating furnace capable of uniformly heating a billet.SOLUTION: The rotary hearth type heating furnace that heats a billet 1, is provided with an annular hearth that rotates in a circumferential direction. The hearth has a billet placing portion 10 provided with a first refractory 20 and a second refractory 30 arranged alternately in a radial direction of the hearth, an upper surface of the first refractory 20 constitutes a support surface for supporting the billet 1, an upper surface of the second refractory 30 is located at least 10 mm below the support surface, the billet placing portion 10 has in order from an outer circumference to an inner circumference of the hearth, (1) an outer peripheral side large distance portion 40 where a distance between the first refractories 20 in the radial direction of the hearth is L1, (2) a small distance portion 50 where a distance between the first refractories 20 in the radial direction of the hearth is L2, and (3) an inner peripheral side large distance portion 60 where a distance between the first refractories 20 in the radial direction of the hearth is L3, in which L2