9Cr鋼配管母材に関するサンプル採取加工精度の評価

抄録

With Gr. 91 boiler piping base metals used for a long time in ultra-supercritical (USC) power plant as target, a small sample was taken using the electric discharge sampling equipment, and we investigated the affected layer thickness by the electric discharge processing method, the dimensional accuracy of the small sample , and processing after sampling of small samples. As a result, it was confirmed that the thickness of the processing influence layer by the electric discharge processing method is within about 30 μm for both the sample and the pipe side, the sampling accuracy in the thickness direction of the sample is about ± 0.2 mm. In addition, almost no processing influence layer after grinder molding was found.