The corrosion of low temperature reheater tubes in Russian-made unitts has close relationship with the control of environmental factors during the unit's shutdown maintenance phase. Through simulated tests

the influences of environmental factors

such as the relative humidity and temperature

and chemical dosing process on the corrosion of low temperature reheater material(12 Cr Mo V) with salts deposition were analyzed. The results indicate that

the relative humidity affected the most

keeping the relative humidity lower than 40% can prevent the corrosion on the low temperature reheater material with salts deposition. It suggests the active amine be used to protect the low temperature reheater material. Shutdown maintenances for Russian-made unitts are proposed with consideration of the shutdown time.