###### Abstract  
This article presents the properties of a Ti coating (angle of grain growth, thickness of the deposited layer, adhesion, and roughness of the deposited layer) deposited on the inner surface of a steel tube. The Ti coating was deposited using the EB PVD (electron beam physical vapor deposition) method. The areas in which the measurements were carried out are defined by the height of the measured area under the target (from 305 to 425 mm) and the radius of the tube (from 100 to 140 mm). The measurements showed that the angle of grain growth is in an interval from 40 to 61\({}^{\circ}\). The results of the statistical analysis demonstrate that the height of the measured area and the tube radius significantly impact the angle of grain growth and adhesion. On the other hand, the impact of the height of the measured area and the tube radius on the roughness of the applied coating was not confirmed. Ti layer; EB PVD; mechanical properties; method ANOVA; regression and correlation analysis 2024 14 6613 10.3390/2024/14/6613 10. The properties of thin layers (hardness, Young's modulus, roughness, coefficient of friction, etc.) can influence technological factors of the deposition--bias, density of the current, pressure in the vacuum chamber, and the position of the coated surface in the vacuum chamber. The Thornton diagram shows that the ratio of the substrates' temperature to the melting point of the material of the coating is up to 0.3 (the deposition temperature is up to 300 \({}^{\circ}\)C) [2]. The structure of the thin layer is made up of columnar-structured grains and nano, micro, and macro gaps (empty areas/gaps) [3]. The columns can grow perpendicular to the surface; however, they often grow at an angle that is lower than 90\({}^{\circ}\). When coating the inner surface of the cylinder with a diameter equal to 200 cm, the incidence angle is oblique. The coating therefore has a columnar structure, with columns growing at an angle that is less than 90\({}^{\circ}\)[4; 5]. We can perhaps conclude that the structure of the deposited coating has an impact on the mechanical and tribological properties of the coating. [PERSON] et al. [6] deposited a Cr film using the HiPIMS method (high-power impulse magnetron sputtering--HiPIMS) with a planar cathode target and auxiliary anode on the inner surface of the cylinder. The thickness of the Cr film-deposited auxiliary anode voltage of 60 V has decreased from 1.6 \(\upmu\)m to 0.1 \(\upmu\)m. On the other hand, hardness has increased from 7 GPa to 9.6 GPa [6]. The tube did not rotate during the coating deposition process. [PERSON] et al. [7] have deposited CrC\({}_{\text{x}}\) coating on the inner surface of the cylinder using liquid-injection metal-organic chemical vapor deposition. The technological parameters of the process were as follows: the temperature of the deposition was 450 \({}^{\circ}\)C to 400 \({}^{\circ}\)C, the pressure in the vacuum chamber was 7 \(\times\) 10\({}^{3}\) Pa, the gas H\({}_{2}\) flow rate was 500 cm\({}^{3}\)/min, the reactive gas C\({}_{7}\)H\({}_{8}\) flow rate was 250 cm\({}^{3}\)/min, and the reactive gas BBC bis(benzene) of chrome flow rate was 0.8 cm\({}^{3}\)/min.) They have obtained a CrC coating with a thickness equal to circa 1 \(\upmu\)m. The velocity of growth with a deposition temperature of 400 \({}^{\circ}\)C has decreased in a linear manner from 3.6 \(\upmu\)m/h to 0.5 \(\upmu\)m/h. At a temperature of 450 \({}^{\circ}\)C, the decrease was from 7.5 \(\upmu\)m/hour to 0.5 \(\upmu\)m/hour. [PERSON] et al. [8] have deposited a DLC coating on the inner surface of a steel cylinder using a hybrid pulse DC PECVD method [8]. A steel tube had a diameter equal to 10 cm and a length equal to 200 cm.