Hot stamping component and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-2021187583-A1
Application number	US-202017110092-A
Country	US
Kind code	A1
Filing date	Dec 2, 2020
Priority date	Dec 20, 2019
Publication date	Jun 24, 2021
Grant date	—

Abstract

Disclosed is a hot-stamping component, which includes a base steel plate; and a plated layer on the base steel plate and including a first layer, a second layer, and an intermetallic compound portion having an island shape in the second layer, wherein the first layer and the second layer are sequentially stacked, and an area fraction of the intermetallic compound portion with respect to the second layer is an amount of 20% to 60%.

First claim

1 . A hot-stamping component comprising:
a base steel plate; and a plated layer on the base steel plate, the plated layer comprising a first layer, a second layer, and an intermetallic compound portion having an island shape in the second layer, wherein the first layer and the second layer are sequentially stacked, and an area fraction of the intermetallic compound portion with respect to the second layer is 20% to 60%.

2 . The hot-stamping component of claim 1 , wherein the second layer comprises at least one of an FeAl 3 phase and an Fe 2 Al 5 phase, and an average grain size of the FeAl 3 phase and the Fe 2 Al 5 phase is 3 μm to 15 μm.

3 . The hot-stamping component of claim 1 , wherein the intermetallic compound portion is discontinuously arranged in the second layer.

4 . The hot-stamping component of claim 1 , wherein the intermetallic compound portion comprises an amount of 62 wt % to 67 wt % of iron (Fe), an amount of 2 wt % to 6 wt % of silicon (Si), and an amount of 30 wt % to 34 wt % of aluminum (Al).

5 . The hot-stamping component of claim 1 , wherein a content of aluminum in the intermetallic compound portion is greater than a content of aluminum in the second layer.

6 . The hot-stamping component of claim 1 , wherein the plated layer further comprises a surface layer stacked on the second layer, and an average thickness of the surface layer is 100 nm to 200 nm.

7 . The hot-stamping component of claim 1 , wherein the base steel plate comprises an amount of 0.19 wt % to 0.38 wt % of carbon (C), an amount of 0.1 wt % to 1 wt % of silicon (Si), an amount of 1 wt % to 2 wt % of manganese (Mn), an amount of greater than 0 wt % and less than or equal to 0.03 wt % of phosphorus (P), an amount of greater than 0 wt % and less than or equal to 0.01 wt % of sulfur (S), an amount of 0.1 wt % to 0.6 wt % of chromium (Cr), an amount of 0.01 wt % to 0.05 wt % of titanium (Ti), an amount of 0.001 wt % to 0.005 wt % of boron (B), remaining iron (Fe), and unavoidable impurities.

8 . A method of manufacturing the hot-stamping component of claim 1 , the method comprising:
manufacturing a plated steel plate by immersing a base steel plate in a plating bath comprising aluminum and silicon; coating the plated steel plate with an oil comprising an ester-based compound; forming a blank by cutting the plated steel plate coated with the oil; and heating the blank in a heating furnace.

9 . The method of claim 8 , wherein the oil is coated at 0.1 g/m 2 to 10 g/m 2 on the plated steel plate.

10 . The method of claim 9 , wherein the oil comprises an amount of 10 wt % to 30 wt % of hydrotreated heavy paraffin refined oil, an amount of 30 wt % to 50 wt % of solvent-dewaxed heavy paraffin refined oil, an amount of 1 wt % to 5 wt % of solvent-refined heavy paraffin refined oil, and an amount of 10 wt % to 40 wt % of an ester-based compound.

11 . The method of claim 8 , wherein in the heating of the blank in the heating furnace, the heating furnace has a plurality of sections having different temperature ranges from each other, and the blank is heated in stages in the heating furnace.

12 . The method of claim 11 , wherein in the heating of the blank in the heating furnace, at least two blanks having different thicknesses from each other are simultaneously transferred into the heating furnace.

13 . The method of claim 8 , further comprising, after the heating of the blank, transferring the heated blank from the heating furnace to a press mold;
forming a molded body by hot-stamping the transferred blank; and cooling the formed molded body.

Assignees

• Hyundai Steel Co

Inventors

• Kim Hye Jin
• Hwang Kyu Yeon
• Jung Hyun Yeong
• Lee Jin Ho
• Jung Seung Pill

Classifications

• C23C2/40

  Plates; Strips · CPC title

• C23C2/12

  Aluminium or alloys based thereon · CPC title

• C23C2/022

  by heating · CPC title

• C23C2/29

  Cooling or quenching · CPC title

• C23C2/28

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