CARBON STEEL SHEET SUPERIOR IN FORMABILITY AND MANUFACTURING METHOD THEREOF

摘要

The present invention provides a carbon steel sheet having high formability due to a microscopic and uniform carbide distribution and having a good characteristic of final heat treatment, and a manufacturing method thereof. Such a present invention provides a carbon steel sheet having excellent formability, wherein: the carbon steel sheet includes, in the unit of wt%, C at 0.2 - 0.5%, Mn at 0.1-1.2%, Si at less than or equal to 0.4%, Cr at less than or equal to 0.5%, Al at 0.01-0.1%, S at less than or equal to 0.012%, Ti at less than or equal to 0.5 x 48/14 x [N]% when the condition of B(atomic%)/N(atomic%)>l is satisfied or by 0.5 x 48/14 x [N]% to 0.03% when the condition of B and N is not satisfied, B at 0.0005 - 0.0080%, N at less than or equal to 0.006%, Fe, and extra inevitable elements; an average size of carbide is less than or equal to lµm; and an average grain size of ferrite is less than or equal to 5µm.