In engineering structure castings play important role, spatially in minus
temperature. These conditions arise with additional stresses cracks and defects in steel
castings. Since different properties of materials show different crack propagation, it is
necessary to find the limiting parameters, which ensure the proper work of machines.
For this reason, this chapter describes the fracture toughness, transition temperature,
brittle and ductile fractures, chemical composition of cast steels and effect of heat
treatment.
Keywords: Brittle fracture, Effect of alloying, Inclusions, Micro-porosity,
Transition temperature.
