A coated steel substrate

Patent metadata

Field	Value
Publication number	US-2022411911-A1
Application number	US-202017771568-A
Country	US
Kind code	A1
Filing date	Oct 29, 2020
Priority date	Oct 29, 2019
Publication date	Dec 29, 2022
Grant date	—

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

1 - 17 . (canceled)

18 . 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%
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%,
a remainder of the composition being made of iron and inevitable impurities resulting from processing.

19 . The coated stainless-steel substrate as recited in claim 18 wherein a lateral size of the nanographites is between 1 and 65 μm.

20 . The coated stainless-steel substrate as recited in claim 18 wherein a width size of the nanographites is between 2 to 15 μm.

21 . The coated stainless-steel substrate as recited in claim 18 wherein a thickness of the nanographites is between 1 to 100 nm.

22 . The coated stainless-steel substrate as recited in claim 18 wherein a concentration of nanographites in the coating is between 5% and 70% by weight.

23 . The coated stainless-steel substrate as recited in claim 18 wherein a concentration of sodium silicate in the coating is between 35% and 75% by weight.

24 . The coated stainless-steel substrate as recited in claim 18 wherein a ratio in weight of nanographites with respect to the binder is between 0.05 and 0.9.

25 . The coated stainless-steel substrate as recited in claim 18 wherein a thickness of the coating is between 10 and 250 μm.

26 . The coated stainless-steel substrate as recited in claim 18 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.

27 . A method for the manufacture of a coated stainless-steel substrate 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.

28 . The method as recited in claim 27 further comprising drying the coating obtained in step B).

29 . The method as recited in claim 27 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.

30 . The method as recited in claim 28 wherein the drying is performed at a temperature between 50 and 150° C.

31 . 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 a coated stainless-steel substrate as recited in claim 18 .

32 . 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 a coated stainless-steel substrate as recited in claim 18

33 . A hot dip coating facility as recited in claim 32 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

• C04B14/024

  Graphite · CPC title

• C23C2/40

  Plates; Strips · CPC title

• C22C38/44

  with molybdenum or tungsten · CPC title

• C23C24/082 Primary

  without intermediate formation of a liquid in the layer · CPC title

• C22C38/001

  containing N · CPC title