Steel sheet for hot press formed member
AssigneePosco
InventorsSeong-Woo KIM, Jin-Keun OH, A-Ra CHO, Hyeon-Jeong SHIN
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Abstract
The present invention relates to a hot press formed member. A hot press formed member according to one aspect of the present invention comprises a steel sheet; and a plating layer on the steel sheet, wherein a number of voids per 1000 μm2 of an area from an interface between the plating layer and the steel sheet to 15 μm is zero and wherein a concentration gradient at a section having an Fe content of 45% to 80% in the plating layer in a thickness direction from a surface of the plating layer according to a result of GDS analysis is 7 wt %/μm or less.
Claims19
A hot press formed part, comprising:
- a steel sheet;
- and
- a plating layer on the steel sheet,
- wherein an Fe concentration gradient in a section of the plating layer where the Fe content is 45 wt % or more and 80 wt % or less in the thickness direction from the surface of the plating layer according to the result of GDS analysis is 7 wt %/μm or less,
- wherein an average content of Fe of the plating layer is 40 wt % or more, and
- wherein a number of voids per 1000 μm2 of an area from an interface between the plating layer and the steel sheet to 15 μm is 10 or less.
A hot press formed part, comprising:
- a steel sheet;
- and
- a plating layer on the steel sheet,
- wherein an Fe concentration gradient in a section of the plating layer where the Fe content is 45 wt % or more and 80 wt % or less in the thickness direction from the surface of the plating layer according to the result of GDS analysis is 7 wt %/μm or less, and
- wherein an average content of Fe of the plating layer is 40 wt % or more.
A hot press formed part, comprising:
- a steel sheet;
- and
- a plating layer on the steel sheet,
- wherein an Fe concentration gradient in a section of the plating layer where the Fe content is 45 wt % or more and 8 0wt % or less in the thickness direction from the surface of the plating layer according to the result of GDS analysis is 7 wt %/μm or less.
Dependencies are inferred from the claim text.