Steel sheet for hot press formed member
AssigneePosco
InventorsSeong-Woo Kim, Jin-Keun Oh, A-Ra Cho, Hyeon-Jeong Shin
Life of this patent
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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.
Claims9
A hot press formed member, comprising:
- 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, 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 glow discharge emission spectrometry (GDS) analysis is 7wt %/um or less, wherein an average content of Fe of the entire plating layer is 40 wt % or more, and wherein the average content of Fe refers to a value calculated by integrating a curve representing the Fe content across an entire thickness of the plating layer to obtain an integral, as analyzed from the surface of the plating layer to the interface with the steel sheet via glow discharge emission spectrometry, and dividing the integral by the entire thickness of the plating layer.
A hot press formed member, comprising:
- 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, 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 glow discharge emission spectrometry (GDS) analysis is 5wt %/μm or less, wherein an average content of Fe of the entire plating layer is 40 wt % or more, and wherein the average content of Fe refers to a value calculated by integrating a curve representing the Fe content across an entire thickness of the plating layer to obtain an integral, as analyzed from the surface of the plating layer to the interface with the steel sheet via glow discharge emission spectrometry, and dividing the integral by the entire thickness of the plating layer.
A hot press formed member, comprising:
- 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 15um is zero, 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 glow discharge emission spectrometry (GDS) analysis is 7wt %/μm or less, wherein an average content of Fe of the entire plating layer is 40 wt % or more, wherein the average content of Fe refers to a value calculated by integrating a curve representing the Fe content across an entire thickness of the plating layer to obtain an integral, as analyzed from the surface of the plating layer to the interface with the steel sheet via glow discharge emission spectrometry, and dividing the integral by the entire thickness of the plating layer, and wherein the steel sheet comprises, by wt %, carbon (C):
- 0.04% to 0.5%, silicon (Si):
- 0.01% to 2%, manganese (Mn):
- 0.01% to 10%, aluminum (AI):
- 0.001% to 1.0%, phosphorus (P):
- 0.05% or less, sulfur(S):
- 0.02% or less, nitrogen (N):
- 0.02% or less, and residual iron (Fe) and inevitable impurities.
Dependencies are inferred from the claim text.