Effet of Ti-microalloy Addition on the Formability and Mechanical Properties of a Low Carbon (ST 14) Steel

A low carbon Al-killed Ti-added steel was produced in Mobarakeh Steel Complex in Iran. Mechanical properties and microstructural characterizations of steel in the as-cast, hot-rolled, cold-rolled and annealed conditions are presented. Dilatometery tests were carried out to measure the finishing and annealing temperatures of steel. It was found that the ad dition o f small amo unts of Ti increased the transformation temperatures. In addition, microalloying with titanium improved the ductility of the produced slabs and hot rolled steel sheet. However, low temperature annealing of Ti-added cold-rolled steel sheets led to a decrease in ductility. The results indicate that the full softening of the Ti-added cold-rolled steel is co mpleted for an annealing time of 2hr at 800èC.