The examined material comprised two grades of corrosion-resistant cast steel, namely GX2CrNiMoN25-6-3 and GX2CrNiMoCuN25-6-3-
3, used for example in elements of systems of wet flue gas desulphurisation in power industry. The operating conditions in media heated
up to 70°C and containing Cl- and SO4 ions and solid particles produce high erosive and corrosive wear.The work proposes an application
of the σ phase as a component of precipitation strengthening mechanism in order to increase the functional properties of the material.
The paper presents the results of examination of the kinetics of σ phase precipitation at a temperature of 800°C and at times ranging from
30 to 180 minutes. Changes in the morphology of precipitates of the σ phase were determined using the value of shape factor R.
Resistance to erosion-corrosion wear of duplex cast steel was correlated with the kinetics of sigma phase precipitating.