Zn-plated hot stamped product

Patent metadata

Field	Value
Publication number	US-12546012-B2
Application number	US-202018010883-A
Country	US
Kind code	B2
Filing date	Oct 30, 2020
Priority date	Oct 30, 2020
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

This Zn-plated hot stamped product includes a steel, a Zn-based plating layer, and an oxide layer, in which an upper layer which is a region on a surface side of the Zn-based plating layer has a two-phase structure of a Γ phase and an Fe—Zn solid solution, and a lower layer which is a region of the Zn-based plating layer excluding the upper layer has a single-phase structure of an Fe—Zn solid solution, an upper layer thickness and a lower layer thickness satisfy the following expression, a Mn content ratio of Max. Mn/Min. Mn, which is a ratio of a maximum value Max. Mn to a minimum value Min. Mn of an Mn content on a surface of the Zn-plated hot stamped product, is 10.0 or less, and an average value Ave. Mn is 0.5 to 7.5% by mass %.

0.20≤upper layer thickness/(upper layer thickness+lower layer thickness)≤0.80

First claim

The invention claimed is:

1 . A Zn-plated hot stamped product comprising:
a steel; a Zn-based plating layer containing Zn formed on a surface of the steel; and an oxide layer containing Zn and Mn formed on a surface of the Zn-based plating layer, wherein the Zn-based plating layer includes a lower layer and an upper layer, wherein the upper layer is a region on the surface side of the Zn-based plating layer which has a two-phase structure in which a Fe—Zn solid solution is distributed in the Γ phase, and the lower layer is a region of the Zn-based plating layer on the steel side excluding the upper layer which has a single-phase structure of the Fe—Zn solid solution, an upper layer thickness and a lower layer thickness satisfy the following expression (1), and a maximum value Max. Mn, a minimum value Min. Mn, and an average value Ave. Mn of an Mn content by mass % on a surface of the Zn-plated hot stamped product satisfy the following expressions (2) and (3),
0.20≤upper layer thickness/(upper layer thickness+lower layer thickness)≤0.80  (1)

Ave. Mn=0.5 to 7.5  (2)

Max. Mn/Min. Mn≤10.0  (3).

2 . The Zn-plated hot stamped product according to claim 1 , wherein a proportion of the Γ phase in the two-phase structure of the Γ phase and the Fe—Zn solid solution of the upper layer is 20 to 80%.

3 . The Zn-plated hot stamped product according to claim 1 , wherein a Zn content of the Zn-based plating layer is 30.0% or more by mass %.

4 . The Zn-plated hot stamped product according to claim 1 , wherein a sheet thickness is 1.0 to 3.2 mm.

5 . The Zn-plated hot stamped product according to claim 2 , wherein a Zn content of the Zn-based plating layer is 30.0% or more by mass %.

6 . The Zn-plated hot stamped product according to claim 2 , wherein a sheet thickness is 1.0 to 3.2 mm.

7 . The Zn-plated hot stamped product according to claim 3 , wherein a sheet thickness is 1.0 to 3.2 mm.

8 . The Zn-plated hot stamped product according to claim 5 , wherein a sheet thickness is 1.0 to 3.2 mm.

Assignees

• Nippon Steel Corp

Inventors

• Sengoku Akihiro
• Akiba Kojiro
• Takebayashi Hiroshi
• Nonaka Toshiki

Classifications

• 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

• C23C2/26

  After-treatment (C23C2/14 takes precedence) · CPC title

• C23C2/28 Primary

  Thermal after-treatment, e.g. treatment in oil bath · CPC title

• C23C28/345

  with at least one oxide layer · CPC title

• C23C2/29

  Cooling or quenching · CPC title