	US 12,473,609 B2
	Coated steel substrate
Carlos Laliena Iranzo, Asturias (ES); and Marcos Perez Rodriguez, Asturias (ES)
Assigned to ArcelorMittal, Luxembourg (LU)
Appl. No. 16/768,569
Filed by ArcelorMittal, Luxembourg (LU)
PCT Filed Dec. 11, 2018, PCT No. PCT/IB2018/059873 § 371(c)(1), (2) Date May 29, 2020, PCT Pub. No. WO2019/123105, PCT Pub. Date Jun. 27, 2019.
Claims priority of application No. PCT/IB2017/058105 (WO), filed on Dec. 19, 2017.
Prior Publication US 2020/0318213 A1, Oct. 8, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. C21D 9/46 (2006.01); C21D 1/70 (2006.01); C21D 8/02 (2006.01); C21D 9/04 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/50 (2006.01)

CPC C21D 9/46 (2013.01) [C21D 1/70 (2013.01); C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C21D 9/04 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/50 (2013.01)]

21 Claims

1. A method for the manufacture of a coated steel substrate comprising:

a steel substrate;

a coating including nanographite flakes having a lateral size between 1 and 60 μm; and

a binder, wherein the steel substrate has a composition in weight percent as follows:

0.31≤C≤1.2%,

0.1≤Si≤1.7%,

0.7≤Mn≤3.0%,

P≤0.01%,

S≤0.1%,

Cr≤0.5%,

Ni≤0.5%,

Mo≤0.1%,

and on a purely optional basis, at least one of the following:

Nb≤0.05%,

B≤0.003%,

Ti≤0.06%,

Cu≤0.1%,

Co≤0.1%,

N≤0.01%,

V≤0.05%,

a remainder of the composition being made of iron and inevitable impurities resulting from processing, the method comprising the successive following steps:

providing the steel substrate; and

depositing an aqueous mixture on the steel substrate to form the coating,

wherein the steel substrate is a slab, a billet or a bloom.