Steel castings are often used in the construction of valve chambers of steam turbines. Stringent requirements are
set due to the continuous operation of the material at elevated temperatures, in the order of 300ºC to 600ºC. The
material of the valve chamber must be resistant to fatigue-creep changes as well as corrosion. This material must be
also resistant to dynamic damage which occures when the turbine is starting and stopping. Dynamic damage is
induced by a short-lasting but intense accumulation of localized stresses. The castings of the valve chambers of the
steam turbine are usually made from the “three-component” type CrMoV-cast steel. Mentioned castings of the valve
chamber are continuously subjected to high temperatures, either constant and periodically variable stresses. Due to
this, the degradation process of material of the castings is taking place. It is caused by physicochemical processes
such as: creep, relaxation, thermal fatigue, corrosion, erosion and changes in material properties, e.g. displacement
of the critical point of brittleness. Finally, first cracks and deformations can be observed in the material during the
operation. The art presents the process of revitalization technology of the steam turbine valve chamber which was
subjected to long-term operation at high temperatures. The revitalization process is aimed at improving the plastic
properties of the material and, as the result, extending its service life. The research presented in the article show that
impact strength of the chamber material after revitalization is very high. Also the strength properties of the valve
chamber, after revitalization, are high and in line with the requirements. The study show that the revitalization of the
valve chamber was carried out correctly and restored the material to plastic deformation.
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