Analýza nehomogenity mechanických vlastností žebírkového drátu z oceli B500B po válcování za tepla a po natažení za studena

Abstract

This bachelor thesis deals with analysis of non-homogeneity of mechanical properties of ribbed wire from B500B steel after hot rolling and after cold stretching. In the operating experiment, wire samples were obtained after hot rolling (30 samples) and after cold stretching (18 samples). These samples were used for the tensile test. We obtained value of ultimate tensile stress, yield strength and elongation, which characterize changes in wire properties over its length after hot rolling and subsequent cold stretching. By analysing these values, we have shown that the main cause of the inhomogeneity of the mechanical properties of the ribbed wire over its length is the method of laying the wire threads on the chain conveyor of the wire rod line in ArcelorMittal Ostrava (KDT AMO). A rather surprising finding is that the subsequent cold stretching increase mechanical properties inhomogeneity.