Abstract
Ductile irons of the type of Si-Mo are characterized by increased resistance to long-term influence of high temperatures and
cyclic temperature changes. They are mainly used in castings of combustion engine exhaust piping and other castings utilized at
temperatures of up to 850°C. The aim of the study is to verify the mechanical properties of non-alloyed cast iron EN CSN GJS
450, SiMo4-0.5 and SiMo5-1 ductile irons at temperatures of 700 to 800°C, and the extent of their superficial oxidation after longterm
annealing at a temperature of 900°C. Via chemical microanalysis the composition of oxidation products in the surface layer
was evaluated.
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