Development of Long life-time elliptical radiant tube

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Other Title
  • 長寿命な楕円型ラジアントチューブの開発

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<p>Radiant tube (hereinafter called “RT”) is a heating facility used in a continuous annealing furnace. One of the problems of RT is to suppress creep deformation of RT under high temperature environment in the furnace. The suppression of the deformation of RT in the gravitational direction is particularly important in the vertical annealing furnace. In this study, the deformation quantity was compared using FEM for RT of the conventional circular shape and RT of the elliptical shape with high rigidity in the gravity direction. In addition, the structure which can relieve the concentration of stress was examined on the support of RT. An elliptical RT with the developed support was introduced into the annealing furnace, and the deformation rate of RT in the gravity direction was recorded for a long time. As the result, the deformation rate of the introduced RT became 1/6 of the conventional RT.</p>

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