To put in a nut shell ‘Alloying with copper was found to results in promising benefits on mechanical properties of transformation-induced plasticity steels’. In this research, the CMnSiAlCu transformation-induced plasticity steels were annealed at two different temperatures. The unique combination of mechanical properties was obtained in new developed copper containing transformation-induced plasticity steels. It was also showed that by adding 2.4%Cu in transformation-induced plasticity steels and in both 770°C and 800°C annealing treated condition, the yield and tensile strengths were increased by more than 35% and 26%. Moreover, a detailed examination of deformation and strain hardening behaviour of the steels studied revealed that the lower annealing temperature leads to the more uniform strain distribution within the copper-added transformation-induced plasticity steel.
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