Coated steel substrate

Patent metadata

Field	Value
Publication number	US-12522909-B2
Application number	US-202017771568-A
Country	US
Kind code	B2
Filing date	Oct 29, 2020
Priority date	Oct 29, 2019
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

A coated stainless-steel substrate including a coating including nanographites and a binder being sodium silicate, wherein the stainless-steel substrate has the following composition in weight percent: C≤1.2%, Cr≥11.0%, Ni≥8.0% and on a purely optional basis, one or more elements such as Nb≤6.0%, B≤1.0%, Ti≤3.0%, Cu≤5.0%, Co≤3.0%, N≤1.0%, V≤3.0%, Si≤4.0%, Mn≤5.0%, P≤0.5%, S≤0.5%, Mo≤6.0%, Ce≤1.0%, the remainder of the composition being made of iron and inevitable impurities resulting from the elaboration. A method for the manufacture of this coated stainless-steel substrate is also provided.

First claim

What is claimed is:

1 . A coated stainless-steel substrate comprising:
a stainless-steel substrate; and a coating comprising nanographites and a binder being sodium silicate, wherein the stainless-steel substrate has the following composition in weight percent:
C≤1.2%,
Cr≥11.0%,
Ni≥8.0%
0.0%≤Nb≤6.0%,
0.0%≤B≤1.0%,
0.0%≤Ti≤3.0%,
0.0%≤Cu≤5.0%,
0.0%≤Co≤3.0%,
0.0%≤N≤1.0%,
0.0%≤V≤3.0%,
0.0%≤Si≤4.0%,
0.0%≤Mn≤5.0%,
0.0%≤P≤0.5%,
0.0%≤S≤0.5%,
0.0%≤Mo≤6.0%,
0.0%≤Ce≤1.0%,
a remainder of the composition being made of iron and inevitable impurities resulting from processing.

2 . The coated stainless-steel substrate as recited in claim 1 wherein a lateral size of the nanographites is between 1 and 65 μm.

3 . The coated stainless-steel substrate as recited in claim 1 wherein a width size of the nanographites is between 2 to 15 μm.

4 . The coated stainless-steel substrate as recited in claim 1 wherein a thickness of the nanographites is between 1 to 100 nm.

5 . The coated stainless-steel substrate as recited in claim 1 wherein a concentration of nanographites in the coating is between 5% and 70% by weight.

6 . The coated stainless-steel substrate as recited in claim 1 wherein a concentration of sodium silicate in the coating is between 35% and 75% by weight.

7 . The coated stainless-steel substrate as recited in claim 1 wherein a ratio in weight of nanographites with respect to the binder is between 0.05 and 0.9.

8 . The coated stainless-steel substrate as recited in claim 1 wherein a thickness of the coating is between 10 and 250 μm.

9 . The coated stainless-steel substrate as recited in claim 1 wherein the coating further comprises clay, silica, quartz, kaolin, aluminium oxide, magnesium oxide, silicon oxide, titanium oxide, yttrium oxide, zinc oxide, aluminium titanate, carbides or mixtures thereof.

10 . The coated stainless-steel substrate as recited in claim 1 , wherein the coating consists of the nanographites, the binder and optional additives selected from a group consisting of clay, silica, quartz, kaolin, aluminium oxide, magnesium oxide, silicon oxide, titanium oxide, yttrium oxide, zinc oxide, aluminium titanate, carbides and mixtures thereof.

11 . The coated stainless-steel substrate as recited in claim 1 , wherein a lateral size of the nanographites is between 1 and 65 μm, a width size of the nanographites is between 2 to 15 μm, and a thickness of the nanographites is between 1 to 100 nm.

12 . A coated stainless-steel substrate comprising:
a stainless-steel substrate; and a coating comprising nanographites and a binder being sodium silicate, wherein the stainless-steel substrate has the following composition in weight percent:
C≤1.2%,
Cr≥11.0%,
Ni≥8.0%
0.0%≤Nb≤6.0%,
0.0%≤B≤1.0%,
0.0%≤Ti≤3.0%,
0.0%≤Cu≤5.0%,
0.0%≤Co≤3.0%,
0.0%≤N≤1.0%,
0.0%≤V≤3.0%,
0.0%≤Si≤4.0%,
0.0%≤Mn≤5.0%,
0.0%≤P≤0.5%,
0.0%≤S≤0.5%,
0.0%≤Mo≤6.0%,
0.0%≤Ce≤1.0%,

a remainder of the composition being made of iron and inevitable impurities resulting from processing,
wherein a concentration of nanographites in the coating is between 10% and 70% by weight.

13 . The coated stainless-steel substrate as recited in claim 12 wherein a concentration of nanographites in the coating is between 10% and 65% by weight.

14 . The coated stainless-steel substrate as recited in claim 13 wherein a lateral size of the nanographites is between 1 and 65 μm, a width size of the nanographites is between 2 to 15 μm, and a thickness of the nanographites is between 1 to 100 nm.

15 . The coated stainless-steel substrate as recited in claim 13 wherein a ratio in weight of nanographites with respect to the binder is between 0.05 and 0.9.

16 . A method for the manufacture of the coated stainless-steel substrate as recited in claim 1 comprising the successive following steps:
A. providing a stainless-steel substrate comprising in weight percent at most 1.2% C, at least 11.0% Cr and at least 8.0% Ni, a remainder of the composition being made of iron and inevitable impurities resulting from processing,
B. depositing on at least a part of the stainless-steel substrate of an aqueous mixture comprising nanographites and a binder being sodium silicate to form a coating.

17 . The method as recited in claim 16 further comprising drying the coating obtained in step B).

18 . The method as recited in claim 17 wherein the drying is performed at a temperature between 5° and 150° C.

19 . The method as recited in claim 16 wherein in step B), the aqueous mixture comprises from 40 to 110 g/L of nanographites and from 40 to 80 g/L of binder.

20 . A method for hot dip coating a steel strip comprising a step of moving the steel strip through a molten metal bath comprising a piece of equipment at least partially immersed in the bath, at least a part of the piece of equipment being made of the coated stainless-steel substrate as recited in claim 1 .

21 . A hot dip coating facility comprising a molten metal bath comprising a piece of equipment at least partially immersed in the bath, at least a part of the piece of equipment being made of the coated stainless-steel substrate as recited in claim 1 .

22 . The hot dip coating facility as recited in claim 21 wherein the piece of equipment is selected from the group consisting of a snout, an overflow, a sink roll, a stabilizing roll, a roll supporting arm, a roll flange, a pipeline and a pumping element.

Assignees

• Arcelormittal

Inventors

• Vu Thi Tan
• Megido Fernandez Laura
• Dominguez Fernandez Carlota
• Rodriguez Garcia Jorge
• NORIEGA PEREZ David
• Suarez Sanchez Roberto
• Blanco Roldan Cristina

Classifications

• C23C2/0038

  characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process · CPC title

• C23C2/00348

  Fixed work supports or guides · CPC title

• C23C2/00344

  Means for moving substrates, e.g. immersed rollers or immersed bearings · CPC title

• C23C2/0034

  Details related to elements immersed in bath · CPC title

• C23C2/40

  Plates; Strips · CPC title