EFFECT OF CORROSION ON TORSIONAL STRENGTH OF HEAT TREATED STEEL WELDS

This study investigates the effect of heat treatment processes—annealing, tempering, and normalizing—on the mechanical properties, corrosion resistance, and torsional strength of low-carbon steel. Heat treatment was performed within specific temperature ranges for each process: annealing (538°C-649°C), tempering (149°C-316°C), and normalizing (760°C-816°C). The steel samples were then subjected to corrosion tests in sulfuric acid (H₂SO₄) and torsional strength evaluations. Results indicate that annealing enhanced the ductility and refined the microstructure of the steel, though it was susceptible to corrosion, especially at higher acid concentrations. Tempering improved toughness but reduced corrosion resistance, with a marked increase in corrosion rates compared to untreated steel. Normalizing produced a more uniform structure but provided limited protection against acid-induced corrosion. Torsional testing revealed that low-carbon steel exhibited moderate strength, with its behavior influenced by heat treatment conditions and microstructural changes. The findings underscore the need for further research to develop strategies to enhance the corrosion resistance of low-carbon steel, particularly in acidic environments.