| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat exchange tube which has a high breakdown-strength. SOLUTION: A heat exchange tube A comprises a tube body 70 with its inside being a fluid path 60, while the inside and outside surfaces being the coming/outgoing surface for the heat of fluid. On walls 30 and 40 of the tube body 70 opposite to each other, cup-like protrusion walls 80, 80 and so on. (first protrusion wall) which expand toward facing walls are formed, with the protrusion tip ends of the wall parts 80, 80 and so on, being joint parts 90, 90 and so on protruding linearly. The joint parts 90, 90 and so on abuts in abut in a straight form with respect to the facing walls and are fixed.
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