It is deemed that the dissimilar steel welding between the locating piece and reheater tubes and unproper structure of the location piece are the major reason that causes the tube leakage.

• 分析了再热器管频繁泄漏的原因,认为定位块与再热器管的异种钢焊接及定位块结构的不合理是导致泄漏的主要原因,同时提出了改造方案。