| abstract |
A hot-rolled steel sheet having excellent formability and a method for manufacturing the same are provided. The hot-rolled steel sheet of the present invention, by weight, carbon (C): 0.08 to 0.4%, silicon (Si): 0.5 to 2.5%, manganese (Mn): 0.8 to 3.0%, aluminum (Al): 0.01 to 0.1% , phosphorus (P): 0.001 to 0.05%, sulfur (S): 0.001 to 0.05%, nitrogen (N): 0.001 to 0.02%, the remainder including Fe and other unavoidable impurities, 20 μm or more from the surface of the steel sheet and t/ The microstructure of the surface layer having a thickness in the range of 4 or less, in area%, includes tempered martensite and bainitic ferrite: 67 to 95%, retained austenite: 5 to 30%, and martensite: 3% or less And, the area fraction occupied by needle-shaped retained austenite among the retained austenite is 90% or more of the total retained austenite, and the steel sheet microstructure in the deep part excluding the surface layer part, in area%, bainitic ferrite: 60 to 95 %, retained austenite: 5-30%, martensite: 10% or less. |