INFLUENCE OF RARE EARTH METALS ON MICROSTRUCTURE AND INCLUSIONS MORPHOLOGY G17CrMo5-5 CAST STEEL

This paper presents influence of rare earth metals (REM) on the microstructure and morphology of non-metallic inclusions of G17CrMo5-5 cast carbon steel The research has been performed on successive industrial melts. Each time about 2000 kg of liquid metal was modified. The REM was in the form of mishmetal of the composition 49,8% Ce, 21,8% La, 17,1% Nd, 5,5% Pr and 5,35% the rest of REM. The rare earth metals were put into the ladle during tapping of heat melt from the furnace.