RADIANT TUBE AND METHOD OF MANUFACTURING THE SAME

Disclosed are a radiant tube, and a manufacturing method thereof, wherein the radiant tub comprises : at least two straight pipe unit installed in the vertical direction; and at least one curved pipe unit communicating with the straight pipe unit. Moreover, the straight pipe unit and the curved pipe unit comprises : 0.30 to 0.50 wt% of C; 35 to 56 wt% of Ni; 25 to 36 wt% of Cr; 1 to 18 wt% of W; 0.5 wt% or less of Mo; and the remainder consisting Fe and inevitable impurities. In addition, the curved pipe unit additionally comprises 0.05 to 0.3 wt% of rear earth metal.