발간논문

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Vol.28, No.3, 235 ~ 244, 1990
Title
Effect of Hot rolling Conditions on the Mechanical Properties of Cold - Rolled and Annealed Ultra- Low Carbon Steels
김교성Gyo Sung Kim, 권오준Oh Joon Kwon, 장래웅R . W . Chang
Abstract
A laboratory investigation was carried out to study the effect of hot rolling conditions on the mechanical properties of cold rolled and continuously annealed ultra-low carbon steels stabilized with Titanium. The drawability(r￣-values) of cold rolled and annealed steels was found to be very sensitive to the microstructure of hot bands. Higher r￣-values were observed when the grain structure of the hot bands were more uniform and finer. The as-hot rolled grain structure was fine and uniform when FT was higher than Ar₃. If FT was lower than Ar₃, the grain structure was pancaked or abnormally coarse when the amount of deformation was small. However, when the amount of deformation was sufficiently large and CT was relatively high, the grain structure was uniform and fine by the recrystallization of ferrite. This led to the development of a new hot rolling process where the reheating temperature was adjusted to a lower level so that strips were finish rolled in the ferrite region.
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