| 摘要 |
PURPOSE:To extend the life of the titled tube provided with a U-shaped part for a heating furnace maintained under a non-oxidative atmosphere and to restore said tube in a way as that the effect of restoring the material quality can be expected when the tube is subjected to a heat treatment by sorting and reassembling the cut pipe materials in the stage of cutting, separating and reconditioning said tube. CONSTITUTION:An aged radiant tube 1 made of a heat resisting steel having >=1 U-shaped parts is removed from a furnace body. The tube is cut and separated to straight pipe parts and U-shaped pipe parts. The resulted cut pipe materials 2 are sorted to defectless pipe materials (a), reusable pipe materials (b) by repair and non-reusable pipe materials (c). The materials (b) are subjected to build-up welding and the materials (c) are discarded. Fresh pipe materials are properly replenished to the materials (a) and the materials (b) repaired by build- up welding and these materials are welded to intermediate built-up members 5, 5... which are built-up by welding to restore the tube 1. |
