| 摘要 |
PURPOSE: A radiant tube of annealing furnace is provided which enables pipe members broken or damaged by heat source of high temperature combustion gas to be replaced with new ones so that non-broken or damaged pipe members are recycled. CONSTITUTION: In an annealing furnace for heat treating the strip by supplying a heat source to a radiant tube (1) comprising curved pipe members (120,140,160) connected to a plurality of straight pipe members (110,130,150,170), thereby indirectly heating a strip unidirectionally proceeded, the radiant tube of the annealing furnace is characterized in that a connection straight pipe at both ends of which flange parts (13a,13b) are respectively formed is changeably installed at the middle of length of the straight pipe members (110,130,150,170) which are frequently damaged by heat source of a burner (101), wherein the connection straight pipe comprises a corrugation part (15) to improve heat treatment efficiency by increasing an area through which combustion heat supplied from the burner (101) is radiated into the annealing furnace as radiant heat and reduce thermal expansion by absorbing thermal stress, and wherein the radiant tube of the annealing furnace comprises a guiding part (30) comprising a moving guider (31) installed at the curved pipe members (120,140,160) by idle rotationally assembling a roller member (32) to prevent lateral deformation thereof as minimizing friction generated during expansion according to thermal expansion of first to fourth straight pipe members (110,130,150,170), and a fixed guider (34) fixed to the annealing furnace with traveling female groove (33) for rolling guiding the roller member (32) being formed on the upper surface of the fixed guider (34).
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