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Formation of structure and properties
of complex alloy cast steel

The patters of the effect of change in the chemical composition and modes of heat treatment on the structure
and complex of mechanical properties of cast steel VKL-3 (12Kh2NVML) are studied. The experimental melting of steel with increased content of chromium, silicon, nickel and molybdenum is obtained. The steel of this
composition has reduced ductility and toughness. At the same time, experimental steel melting makes it possible
to the model segregation zones with increased content of alloying elements in the steel of typical composition
that has chemical and structural heterogeneity and heterogeneity of ductility and toughness. It is shown that the
use of the fi nal heat treatment with the adjusted modes (in particular, increased temperature and time of tempering) allows increasing the ductility of the steel to the required values, but the impact strength does not reach the
required levels. The recommendations for maintaining of the alloying elements content near the lower allowable
limit are given.