Manufacturing Method of Carbon Steel Sheet Superior in Formability

A manufacturing method of carbon steel sheet having excellent formability, the method comprising:

• manufacturing a steel slab that comprises, 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 0.5×48/14×[N] %, B at 0.0005-0.0080%, N at less than or equal to 0.006%, Fe, and extra inevitable impurities, where the condition of B(atomic %)/N(atomic %)>1 is satisfied;
• manufacturing a hot rolled steel sheet by reheating and hot rolling the slab with a finishing temperature that is greater than or equal to an Ar3 transformation temperature;
• cooling the hot rolled steel sheet at a cooling speed in a range of 20° C./sec-100° C./sec;
• and
• manufacturing a hot rolled coil by winding the cooled hot rolled steel sheet at a temperature in a range of Ms to 530° C.