| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a repairing structure of a hot blasting tube, in which the hot blasting tube attached to a hot stove for a blast furnace developing crack caused by stress corrosion crack on an iron shell can be repaired with a form without accompanied with the danger, such as again the development of crack caused by stress corrosion crack, the breakage of the iron shell caused by potential development and also, the durability term after repairing is drastically extended. SOLUTION: This structure has a new iron shell 2A coating the whole peripheral section welded to a flange 5 at both ends of the section containing the crack developed part over the whole periphery of both side edges and a gap layer 3 arranged between both new and old iron shells 2A, 2, and a welded part is applied with a residual stress removing annealing. As the other way, the gap layer 3 is filled up with an acid-proof castable refractory or always supplied with the air, having the same pressure or higher as the high temp. air in the inner part of the hot blasting tube 1.</p> |
