Steel plate and a method of manufacturing the same

The present invention provides a method of manufacturing a steel sheet excellent in ductility after the heat treatment and cold formability. Steel sheet of the present invention, component composition, by mass%, C: 0.10~0.40%, Si: 0.30~1.00%, Mn: 0.30~1.00%, Al: 0 .001~0.10%, P: 0.0001~0.02%, S: containing from 0.0001 to 0.01%, in the steel sheet and the balance being Fe and impurities, the number of carbides in the ferrite grain beyond the ratio (B / a) is the number of ones ferrite grain boundary carbide (B) with respect to (a), the ferrite grain diameter is at 5μm or 50μm or less, 2.0 .mu.m average particle diameter of carbide is 0.4μm or more or less, and the pearlite area ratio is 6% or less, a Vickers hardness is equal to or less than 170HV than 120 HV.