Cause Analysis of SA-210 Steel Water-Cooled Wall Leakage

When the SA-210 steel water-cooled pipes are under high temperature and high pressure, high pressure steam will generate an outward pressure on the inner wall of the pipes, which will cause the pipe to swell outward. If there is a small defect on the inner wall of the water-cooled tube, this defect will become a stress concentration point. The additional pressure acts on the stress concentration point to cause cracks, and after the cracks generated, lead to the cracks to expand at the same time. In the cracks, vapor will diffuse into the matrix along the cracks, occurring corrosion under the action of high temperature, which further accelerates crack growth. Eventually, it leads to water-cooled tube wall leakage.