Taking the heat-resistant steel T92 used for high temperature superheater of ultra supercritical boilers as the research object

considering the stress factors in the working process of the superheater

the stress was applied to the C-type specimen in advance by bolting

then the high temperature salt test was carried out in muffle furnace. The results show that

to a certain extent

the melting and volatilization of the composite sulphate at 700 ℃ affected the high temperature corrosion behavior of the coated samples of T92 steel. In the case of stress-free loading

the corrosion form of the T92 steel at 700 ℃ was mainly high temperature oxidation. In the case of stress loading

the stress at 700 ℃ had a positive effect on salt corrosion. For T92 steel pipelines in superheaters of large scale boilers

the effect of stress change on high temperature performance of the pipe should be noticed during the operation.