Plated steel sheet for hot press forming having excellent impact property, hot press formed part, and manufacturing method thereof

1. A hot press formed part comprising:

a base material;

a plated layer comprising aluminum (Al) on the base material; and

a carbon-enriched layer formed in a surface layer part of the base material,

wherein the carbon-enriched layer means a region which the carbon content is 110% or more of an average carbon amount (C 0 ) of the base material,

wherein the surface layer part means a region from an interface between the base material and the plated layer to a depth of 200 μm,

wherein the carbon-enriched layer has a thickness of 10 to 150 μm, and

wherein the interface between the base material and the plated layer means a point at which content of aluminum (Al) is 1%, and

wherein the content of aluminum (Al) is analyzed by a Glow Discharge Spectrometer (GDS) method.

2. The hot press formed part of claim 1 , wherein the base material has a microstructure comprising, by area fraction, 90% or more of martensite or bainite as a main phase, 10% or less of ferrite, and 5% or less of residual austenite.

3. The hot press formed part of claim 1 , wherein the base material comprises, by wt %, 0.15-0.4% of C, 0.1-1.0% of Si, 0.6-3.0% of Mn, 0.001-0.05% of P, 0.0001-0.02% of S, 0.01-0.1% of Al, 0.001-0.02% of N, 0.001-0.01% of B, 0.01-0.5% of Cr, 0.01-0.05% of Ti, and the balance of Fe and inevitable impurities.

4. The hot press formed part of claim 3 , wherein the base material further comprises, by wt %, at least one selected from Mo, Nb, and V in such a manner that a sum thereof is 0.05 to 0.5 wt %.

5. The hot press formed part of claim 1 , which has tensile strength (TS) of 1300 MPa or more and impact absorption energy (IE) of 4.0 J or more measured using a sample having a thickness of 1.5 mm at 25° C.

6. The hot press formed part of claim 1 , which has a product (TS×IE) of tensile strength (TS) and impact absorption energy (IE), measured using a sample having a thickness of 1.5 mm at 25° C., greater than or equal to 8000 MPa·J.

7. The hot press formed part of claim 1 ,

wherein the carbon-enriched layer has a thickness of 21 to 150 μm.

8. The hot press formed part of claim 7 ,

wherein the carbon-enriched layer has a thickness of 40 to 150 μm.

9. The hot press formed part of claim 8 ,

wherein the carbon-enriched layer has a thickness of 51 to 150 μm.

10. The hot press formed part of claim 3 , wherein the plated layer is an Al—Si plated layer.