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AssigneeNippon Steel Corporation
InventorsMasahiro Kubo, Soshi Fujita, Yoshiaki Nakazawa, Hideaki Irikawa, Masahiro Fuda
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A method of producing a hot press-formed product includes subjecting an Al-plated steel sheet having a zinc compound layer or a metallic zinc layer, as an outermost layer, provided on an Al plating layer to hot press forming using a die. The die includes a hard layer having a skewness (Rsk), as measured in a direction from the outside of a die hole toward the inside of the die hole, of 1.3 or less and a hardness Hv_Die of HV 2,000 or more, over the entirety of a region of a steel sheet contact surface that is adjacent to a die shoulder portion. The steel sheet contact surface is a surface located outside of the die hole and configured to contact the Al-plated steel sheet that is to be subjected to the hot press forming.
A method of producing a hot press-formed product, the method comprising:
A die, comprising a hard layer having a skewness (Rsk), as measured in a direction from an outside of a die hole toward an inside of the die hole, of 1.3 or less and a hardness Hv_Die of HV 2,000 or more, over an entirety of a region of a die shoulder adjacent surface that is adjacent to a die shoulder portion, the die shoulder adjacent surface being located outside of the die hole and adjacent to the die shoulder portion.
Dependencies are inferred from the claim text.