The physical and chemical analysis of conditions of appearance and increase of transverse defects in shield pipes

By results of electron probe analysis of surfaces of shield pipes of boiler БК3-420-140-5 features of defeat of metal depending on exploitation factors are established. The presented experimental results and their discussion allow to consider, that appearance and increase of transverse defects at the organization of a normal thermal regime are related with conditions of formation of primary slag sedimentation and amount thermal-changes undergone by shield panels.