The paper presents a study of the chemical composition and selected thermal operations on uniformity of the structure and properties of 75 mm thick cast iron (casting mould YIV). HB hardness distribution was investigated on cross-section of the samples. Rp02, Rm, A5 was determined from tensile specimens cut from the centre and outer sections of the casting YIV. Samples were taken from two plates cut at intervals of 25 mm from the bottom of the casting. Metallographic microsections were made of the grip sections of the tensile specimens. It was found that the applied heat treatment ferritizing annealing, normalizing and the additive alloy (Cu) reduce differences in mechanical properties and structure of matrix in thick-walled castings.Keywords: thick-walled castings, cast iron, heterogeneity, structure, mechanical properties
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