关键词: 超超临界机组, 四大管道, 表面质量, 硬度, 焊接缺陷

Abstract:

In this paper, common quality defects during factory preparation of the four major pipes in ultrasupercritical thermal power units are summarized and analyzed, such as surface quality, offdimension, hardness abnormal and metallographic structure abnormal, weld defects and so on. Then the corresponding quality control measures and suggestions are put forward, providing references for further improving the processing quality of the four major pipes.