Method of forming a hot stamped coated steel product

Patent metadata

Field	Value
Publication number	US-12454737-B2
Application number	US-202418670943-A
Country	US
Kind code	B2
Filing date	May 22, 2024
Priority date	Oct 30, 2006
Publication date	Oct 28, 2025
Grant date	Oct 28, 2025

Abstract

A hot stamped coated steel product, the hot stamped coated steel product comprising: a base steel; and a coating having a thickness of including, proceeding from the base steel outwards: (a) an interdiffusion layer, (b) an intermediate layer, (c) an intermetallic layer, and (d) a superficial layer, the base steel having a composition comprising: 0.15%<carbon<0.5%; 0.5%<manganese<3%; 0.1%<silicon<0.5%; 0.01%<chromium<1%; titanium<0.2%; aluminum<0.1%; phosphorus<0.1%; sulfur<0.05%; 0.0005%<boron<0.08%; a weight ratio of titanium content with respect to the nitrogen content being in excess of 3.42; a remainder being iron and impurities inherent in processing.

First claim

What is claimed is:

1 . A hot stamped coated steel product, the hot stamped coated steel product comprising:
a base steel; and a coating having a thickness of including, proceeding from the base steel outwards:
(a) an interdiffusion layer,
(b) an intermediate layer,
(c) an intermetallic layer, and
(d) a superficial layer,
the base steel having a composition comprising:
0.15%<carbon<0.5%;
0.5%<manganese<3%;
0.1%<silicon<0.5%;
0.01%<chromium<1%;
0%<titanium<0.2%;
aluminum<0.1%;
phosphorus<0.1%;
0 ppm<sulfur<=20 ppm;
0.0005%<boron<0.08%;
nitrogen;
a weight ratio of titanium content with respect to the nitrogen content being in excess of 3.42;
a remainder being iron and impurities inherent in processing.

2 . The hot stamped steel according to claim 1 , wherein said layer (a) has a thickness of 17 micrometers or less.

3 . The hot stamped steel according to claim 1 , wherein said layer (a) has a thickness of 15 micrometers or less.

4 . The hot stamped steel according to claim 1 , wherein said layer (a) has a thickness less than 10 micrometers.

5 . The hot stamped steel according to claim 1 , wherein a total thickness of layers (a) to (d) is greater than 30 micrometers.

6 . The hot stamped steel according to claim 1 , wherein the composition includes 5 ppm <=sulfur <=20 ppm.

7 . The hot stamped steel according to claim 1 , wherein the composition includes 11 ppm <=sulfur <=20 ppm.

8 . The hot stamped steel according to claim 1 , wherein the composition includes 0%<titanium<0.1%.

9 . The hot stamped steel according to claim 1 , wherein a bending angle at fracture of the hot stamped coated steel product is greater than 60%.

10 . The hot stamped steel according to claim 9 , wherein a mechanical resistance of the hot stamped coated steel product is greater than 1400 MPa.

11 . A hot stamped coated steel product, the hot stamped coated steel product comprising:
a base steel; and a coating having a thickness of including, proceeding from the base steel outwards:
(a) an interdiffusion layer,
(b) an intermediate layer,
(c) an intermetallic layer, and
(d) a superficial layer,
the base steel having a composition comprising:
0.15%<carbon<0.5%;
0.5%<manganese<3%;
0.1%<silicon<0.5%;
0.01%<chromium<1%;
0%<titanium<0.2%;
aluminum<0.1%;
phosphorus<0.1%;
0 ppm <=sulfur <=20 ppm;
0.0005%<boron<0.08%;
nitrogen;
a weight ratio of titanium content with respect to the nitrogen content being in excess of 3.42;
a remainder being iron and impurities inherent in processing.

12 . The hot stamped steel according to claim 11 , wherein said layer (a) has a thickness of 17 micrometers or less.

13 . The hot stamped steel according to claim 11 , wherein said layer (a) has a thickness of 15 micrometers or less.

14 . The hot stamped steel according to claim 11 , wherein said layer (a) has a thickness less than 10 micrometers.

15 . The hot stamped steel according to claim 11 , wherein a total thickness of layers (a) to (d) is greater than 30 micrometers.

16 . The hot stamped steel according to claim 11 , wherein the composition includes 0%<titanium<0.1%.

17 . The hot stamped steel according to claim 11 , wherein a bending angle at fracture of the hot stamped coated steel product is greater than 60%.

18 . The hot stamped steel according to claim 17 , wherein a mechanical resistance of the hot stamped coated steel product is greater than 1400 MPa.

19 . A hot stamped coated steel product, the hot stamped coated steel product comprising:
a base steel; and a coating having a thickness of including, proceeding from the base steel outwards:
(a) an interdiffusion layer,
(b) an intermediate layer,
(c) an intermetallic layer, and
(d) a superficial layer,
the base steel having a composition comprising:
0.15%<carbon<0.5%;
0.5%<manganese<3%;
0.1%<silicon<0.5%;
0.01%<chromium<1%;
0%<titanium<0.2%;
aluminum<0.1%;
phosphorus<0.1%;
0 ppm <sulfur <=20 ppm;
0.0005%<boron<0.08%;
a remainder being iron and impurities inherent in processing.

20 . The hot stamped steel according to claim 19 , wherein said layer (a) has a thickness of 17 micrometers or less.

21 . The hot stamped steel according to claim 19 , wherein said layer (a) has a thickness of 15 micrometers or less.

22 . The hot stamped steel according to claim 19 , wherein said layer (a) has a thickness less than 10 micrometers.

23 . The hot stamped steel according to claim 19 , wherein a total thickness of layers (a) to (d) is greater than 30 micrometers.

24 . The hot stamped steel according to claim 19 , wherein the composition includes 11 ppm <=sulfur <=20 ppm.

25 . The hot stamped steel according to claim 19 , wherein the composition includes 5 ppm <=sulfur <=20 ppm.

26 . The hot stamped steel according to claim 19 , wherein the composition includes 0%<titanium<0.1%.

27 . The hot stamped steel according to claim 19 , wherein a bending angle at fracture of the hot stamped coated steel product is greater than 60%.

28 . The hot stamped steel according to claim 27 , wherein a mechanical resistance of the hot stamped coated steel product is greater than 1400 MPa.

Assignees

• Arcelormittal

Inventors

• Drillet Pascal
• Spehner Dominique
• Kefferstein Ronald

Classifications

• C23C2/40

  Plates; Strips · CPC title

• C23C2/26

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

• C23C2/12

  Aluminium or alloys based thereon · CPC title

• B32B15/012

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

• Y10T428/12757

  Fe · CPC title