Granted Patent
B2
US 12,454,737 · App. 18/670,943 · Granted Oct 28, 2025
Method of forming a hot stamped coated steel product
Inventors:
Pascal Drillet (Rozerieulles, FR); Dominique Spehner (Balan, FR); Ronald Kefferstein (Saint Mitre les Ramparts, FR)
Assignee:
ArcelorMittal
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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.
Claims (83)
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.
Assignments (3)
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded May 22, 2024
From: SPEHNER, DOMINIQUE
To: ARCELORMITTAL FRANCE
Reel/Frame 067490/0919 →
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded May 22, 2024
From: KEFFERSTEIN, RONALD; DRILLET, PASCAL
To: ARCELORMITTAL
Reel/Frame 067490/0995 →
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded May 22, 2024
From: ARCELORMITTAL FRANCE
To: ARCELORMITTAL
Reel/Frame 067501/0001 →
Continuity (8)
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