| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a temperature decrease tube which improves the strength reliability and durability under an environment in which temperature changes occur repeatedly.SOLUTION: A temperature decrease tube 10 sprays a coolant to high temperature steam circulating in a pipeline to decrease a temperature of the pipeline. In the temperature decrease tube 10, a two layer composite material 23, which is formed by joining two metal materials, i.e. a first plate-like metal material 21 and a second plate-like metal material 22, is bent into a tube shape to form a tube part. The first metal material 21 is disposed at the inner side of the second metal material 22. A linear expansion coefficient of the first metal material 21 is set so as to be smaller than a linear expansion coefficient of the second metal material 22.</p> |
