ACCURACY OF DRAWN SEAMLESS STEEL TUBES MANUFACTURED UNDER REAL MASS-PRODUCTION CONDITIONS

Abstract

This paper focuses on assessing the dimensional and geometric accuracy of cold-drawn seamless precision steel tubes manufactured under real mass-production conditions. The primary objective of the research was to determine the variability of key dimensional parameters (outer diameter (OD), inner diameter (ID) and wall thickness (WT)) and geometric parameters (concentricity and roundness) along the full length of the tubes, with a particular focus on evaluating standard deviations. A key novelty of this study lies in the inclusion of concentricity and roundness measurements—parameters that, although critical for certain applications, are not typically included in standard product documentation unless specifically requested by the customer. While standard specifications generally report only basic dimensional parameters, this research extends the scope to include additional geometric characteristics, thereby filling a gap in publicly accessible production data. The results provide valuable and previously unavailable insights for those involved in or interested in precision tube applications.