Method of cooling control for steel plate, cooling control device, and method of manufacturing steel plate

Patent metadata

Field	Value
Publication number	US-12534775-B2
Application number	US-201917429413-A
Country	US
Kind code	B2
Filing date	Dec 2, 2019
Priority date	Feb 7, 2019
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

Abstract

A method of cooling control for a steel plate, a cooling control device, and a method of manufacturing a steel plate, which adjust an upper/lower water ratio and prevent C-warping during cooling. The method of cooling control includes: determining an upper/lower water ratio of a steel plate being cooled wherein at least one of a C-warping amount and a curvature is within a target permissible range, based on a past operating condition, a past upper/lower water ratio when cooling under the past operating condition has been implemented, and at least one of a past C-warping amount and a past curvature measured by a shape measuring meter at an outgoing side of a cooling zone when the cooling under the past operating condition is implemented; and adjusting an amount of cooling water to be blown onto the steel plate to reach the upper/lower water ratio.

First claim

The invention claimed is:

1 . A method of performing cooling control for a steel plate while making the steel plate pass through a cooling zone in a conveyance direction, the method comprising:
determining an upper/lower water ratio with respect to a steel plate to be cooled in such a manner that a curvature of the steel plate to be cooled is within a target permissible range, based on only (i) a past operating condition of a steel plate, (ii) a past upper/lower water ratio with respect to the steel plate when cooling under the past operating condition of the steel plate has been implemented, and (iii) a past curvature of the steel plate converted by the following equation based on a past C-warping amount of the steel plate immediately after being cooled in the cooling zone measured by a shape measuring meter arranged at an outgoing side of the cooling zone when the cooling under the past operating condition of the steel plate has been implemented: k=2×δ/((w/2) 2 +δ 2 ), wherein k: the curvature of the steel plate, δ: the C-warping amount of the steel plate, and w: a plate width of the steel plate; and adjusting an amount of cooling water to be blown onto the steel plate to reach the upper/lower water ratio determined in the determining the upper/lower water ratio, wherein the past C-warping amount of the steel plate is measured by the shape measuring meter without measuring an upper surface temperature and a lower surface temperature of the steel plate, and the upper/lower water ratio is determined without taking into consideration the upper surface temperature and the lower surface temperature of the steel plate.

2 . The method of performing cooling control for the steel plate according to claim 1 , wherein
the determining the upper/lower water ratio includes: collecting the past operating condition of the steel plate similar to an operating condition of the steel plate to be cooled, the past upper/lower water ratio with respect to the steel plate when the cooling under the past operating condition of the steel plate has been implemented, and the past curvature of the steel plate converted by the equation based on the past C-warping amount of the steel plate immediately after being cooled in the cooling zone measured by the shape measuring meter arranged at the outgoing side of the cooling zone when the cooling under the past operating condition of the steel plate has been implemented; calculating a relationship between the collected past upper/lower water ratio with respect to the steel plate and the past curvature of the steel plate; and setting the upper/lower water ratio with respect to the steel plate to be cooled in such a manner that the curvature of the steel plate to be cooled is within the target permissible range, from the calculated relationship between the past upper/lower water ratio of the steel plate and the past curvature of the steel plate.

3 . A method of manufacturing a steel plate, comprising performing cooling control for the steel plate using the method according to claim 1 .

4 . A method of manufacturing a steel plate, comprising performing cooling control for the steel plate using the method according to claim 2 .

5 . A system comprising:
a cooling control device for a steel plate performing cooling control while making the steel plate pass through a cooling zone in a conveyance direction; and a shape measuring meter arranged at an outgoing side of the cooling zone, wherein the cooling control device includes:
an upper/lower water ratio determination unit configured to determine an upper/lower water ratio with respect to a steel plate to be cooled in such a manner that a curvature of the steel plate to be cooled is within a target permissible range, based on only (i) a past operating condition of a steel plate, (ii) a past upper/lower water ratio with respect to the steel plate when cooling under the past operating condition of the steel plate has been implemented, and (iii) a past curvature of the steel plate converted by the following equation based on a past C-warping amount of the steel plate immediately after being cooled in the cooling zone measured by the shape measuring meter a when the cooling under the past operating condition of the steel plate has been implemented:
k=2×δ/((w/2) 2 +δ 2 ), wherein k: the curvature of the steel plate, δ: the C-warping amount of the steel plate, and w: a plate width of the steel plate, and
a cooling water amount adjustment unit configured to adjust an amount of cooling water to be blown onto the steel plate to reach the upper/lower water ratio determined by the upper/lower water ratio determination unit, wherein
the shape measuring meter is configured to measure the past C-warping amount of the steel plate without measuring an upper surface temperature and a lower surface temperature of the steel plate, and the upper/lower water ratio determination unit is configured to determine the upper/lower water ratio without taking into consideration the upper surface temperature and the lower surface temperature of the steel plate.

6 . The system according to claim 5 , wherein
the upper/lower water ratio determination unit includes: a collecting unit configured to collect the past operating condition of the steel plate similar to production specifications of the steel plate to be cooled, the past upper/lower water ratio with respect to the steel plate when the cooling under the past operating condition of the steel plate has been implemented, and the past curvature of the steel plate converted by the equation based on the past C-warping amount of the steel plate immediately after being cooled in the cooling zone measured by the shape measuring meter arranged at the outgoing side of the cooling zone when the cooling under the past operating condition of the steel plate has been implemented; a calculating unit configured to calculate a relationship between the collected past upper/lower water ratio with respect to the steel plate and the past curvature of the steel plate; and a setting unit configured to set the upper/lower water ratio with respect to the steel plate to be cooled in such a manner that the curvature of the steel plate to be cooled is within the target permissible range, from the calculated relationship between the past upper/lower water ratio of the steel plate and the past curvature of the steel plate.

Assignees

• Jfe Steel Corp

Inventors

• Ueoka Satoshi
• Hirano Takahiro
• KUMANO Ori

Classifications

• C22C38/18

  containing chromium · CPC title

• C22C38/04

  containing manganese · CPC title

• C22C38/02

  containing silicon · CPC title

• C21D9/46

  for sheet metals · CPC title

• C21D6/008

  containing Si · CPC title