The selection of materials for machine parts and devices depends on their properties and the operating conditions of the part. Correctly chosen materials for parts ensure the reliability and durability of machine operation. Physical properties are inherent to every material. All physical properties of materials depend on the structure of their atoms. The most important physical properties are: density, thermal expansion, thermal and magnetic properties, electrical conductivity, the material's ability to resist oxidation (corrosion) at normal and elevated temperatures, in air, in gaseous or liquid environments. These values are taken into account in the practical use of materials [6].