Plated steel sheet for hot stamping

Patent metadata

Field	Value
Publication number	US-11866828-B2
Application number	US-202117796057-A
Country	US
Kind code	B2
Filing date	Mar 9, 2021
Priority date	Mar 12, 2020
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

A plated steel sheet for hot stamping including a base metal and a galvanized layer that is formed on a surface of the base metal, wherein the galvanized layer includes a galvannealed layer, a solidified zinc layer, and an oxide layer containing Al, in this order from the base metal, and a proportion of a content of Zn (g/m 2 ) in the solidified zinc layer to a content of Zn (g/m 2 ) in the galvanized layer is 10 to 95%.

First claim

The invention claimed is:

1. A plated steel sheet for hot stamping comprising a base metal steel sheet and a galvanized layer as a plated layer that is formed on a surface of the base metal steel sheet, wherein
the galvanized layer includes a galvannealed layer, a solidified zinc layer, and an oxide layer containing Al, in this order from the base metal steel sheet,
a proportion of a content of Zn (g/m 2 ) in the solidified zinc layer to a content of Zn (g/m 2 ) in the galvanized layer is 10 to 95%, and
a chemical composition of the oxide layer satisfies Formula (i) shown below,
3.0≤Zn/Al≤6.0  (i)

where Zn and Al are contents of Zn and Al (g/m 2 ) contained in the oxide layer, respectively.

2. The plated steel sheet for hot stamping according to claim 1 , wherein an average thickness of the oxide layer is 1.0 μm or less.

3. The plated steel sheet for hot stamping according to claim 2 , wherein the content of Zn in the galvanized layer is 65 to 150 g/m 2 .

4. The plated steel sheet for hot stamping according to claim 3 , wherein a content of Fe in the galvanized layer is, in mass %, less than 7%.

5. The plated steel sheet for hot stamping according to claim 2 , wherein a content of Fe in the galvanized layer is, in mass %, less than 7%.

6. The plated steel sheet for hot stamping according to claim 1 , wherein the content of Zn in the galvanized layer is 65 to 150 g/m 2 .

7. The plated steel sheet for hot stamping according to claim 6 , wherein a content of Fe in the galvanized layer is, in mass %, less than 7%.

8. The plated steel sheet for hot stamping according to claim 1 , wherein a content of Fe in the galvanized layer is, in mass %, less than 7%.

Assignees

• Nippon Steel Corp

Inventors

• Takebayashi Hiroshi
• Akiba Kojiro
• Sengoku Akihiro

Classifications

• C23C2/06 Primary

  Zinc or cadmium or alloys based thereon · CPC title

• B21D22/022

  by heating the blank or stamping associated with heat treatment (C21D takes precedence) · CPC title

• B21D22/20

  Deep-drawing (special deep-drawing arrangements in, or in connection with, presses B21D24/00) · CPC title

• B32B15/013

  one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium · CPC title

• B32B15/04

  comprising metal as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a bituminous or tarry layer B32B11/08; next to a water-setting substance layer B32B13/06; next to a glass layer B32B17/061; next to a cellulosic plastic layer B32B23/042)} · CPC title