In structural components of the plant, the effect of high temperature fatigue is very important design factor. In this paper, we conducted high temperatures fatigue tests at the perforated plate of SUS304 commonly used in the plant. We conducted fatigue tests at 500℃, 550℃, 600℃ and 650℃. We evaluated the effect of temperature on fatigue strength. Also, cracks occurred at hole sides are measured by a CCD camera and the crack growth is calculated from photographs.
