| 摘要 |
Disclosed is a heat transfer tube for a steam generator, wherein the surface roughness of the inner surface of a tube is measured in the longitudinal direction, and the dimensional variability in the measured roughness curve at a 50 mm region is 4 µm or less, and amount of bending in a portion having a length of 1,000 mm from an end of the tube is 1 mm or less, so that an eddy-current inspection can be performed at a high S/N ratio when a tube is produced, and the inspection efficiency can be improved, and furthermore, when the tube is incorporated in a heat exchanger, the incorporation operation can be easily performed. It is preferable that the heat transfer tube for a steam generator is produced by processes including a cold working process wherein a drawing process is performed using a high-pressure lubricant having a pressure of 40 MPa or more, a solution heat treatment process, and a straightening process using a roll straightener. Furthermore, regarding the roll straightener, using a roll straightener wherein at least five pairs of drum-shaped straightening rolls which are vertically opposed to each other and which have rotation axes intersecting each other, is preferable. |
