Manufacturing method for slab and continuous casting equipment

Patent metadata

Field	Value
Publication number	US-12515246-B2
Application number	US-201916976388-A
Country	US
Kind code	B2
Filing date	Feb 25, 2019
Priority date	Mar 2, 2018
Publication date	Jan 6, 2026
Grant date	Jan 6, 2026

Abstract

This manufacturing method for a slab is a method for manufacturing a slab by a continuous casting equipment including a twin-drum type continuous casting apparatus, a cooling apparatus, an in-line mill, and a coiling apparatus. The method includes calculating a friction coefficient from measured values of a rolling load and a forward slip when the slab is rolled, by use of a rolling analysis model, and controlling a lubrication condition during rolling of the slab so that the friction coefficient falls within a predetermined range, wherein, when the friction coefficient is calculated from the measured values of the rolling load and the forward slip by use of an Orowan theory and a deformation resistance model formula based on a Shida's approximate formula as the rolling analysis model, the predetermined range is 0.15 or more and 0.25 or less.

First claim

What is claimed is:

1 . A manufacturing method for a slab by a continuous casting equipment comprising:
a twin-drum continuous casting apparatus in which a pair of cooling drums having dimples formed on surfaces of the cooling drums and a pair of side weirs form a molten metal storage portion, and that casts a slab having protrusions formed by the dimples from molten metal stored in the molten metal storage portion while the pair of cooling drums are rotated; a cooling apparatus that is arranged on a downstream side of the twin-drum continuous casting apparatus and cools the slab; an in-line mill that is arranged on a downstream side of the cooling apparatus and performs one-pass rolling on the slab with a work roll at a rolling reduction of 10% or larger; and a coiling apparatus that is arranged on a downstream side of the in-line mill and coils the slab into a coil, the manufacturing method comprising:
calculating a friction coefficient from measured values of a rolling load and a forward slip when the slab is rolled using a rolling analysis model, the rolling analysis model using an Orowan theory and a deformation resistance model formula based on a Shida's approximate formula;
calculating a difference between the friction coefficient that was calculated and a target friction coefficient having a value within a predetermined range, the predetermined range being 0.15 or more and 0.25 or less;
calculating an adjustment amount of a lubrication condition corresponding to the difference that was calculated between the friction coefficient and the target friction coefficient; and
controlling the lubrication condition during rolling of the slab based on the adjustment amount that was calculated.

2 . The manufacturing method for a slab according to claim 1 , wherein
a height of each of the protrusions is 50 μm or higher and 100 μm or lower.

3 . The manufacturing method for a slab according to claim 2 , wherein
the lubrication condition is a supply amount of lubricating oil supplied to the work roll or the cast slab or combination thereof.

4 . The manufacturing method for a slab according to claim 1 , wherein
the lubrication condition is a supply amount of lubricating oil supplied to the work roll or the cast slab or combination thereof.

5 . A continuous casting equipment comprising:
a twin-drum continuous casting apparatus in which a pair of cooling drums having dimples formed on surfaces of the cooling drums and a pair of side weirs form a molten metal storage portion, and that casts a slab having protrusions formed by the dimples from molten metal stored in the molten metal storage portion while the pair of cooling drums are rotated; a cooling apparatus that is arranged on a downstream side of the twin-drum continuous casting apparatus and cools the slab; an in-line mill that is arranged on a downstream side of the cooling apparatus and performs one-pass rolling on the slab with a work roll at a rolling reduction of 10% or larger; a coiling apparatus that is arranged on a downstream side of the in-line mill and coils the slab into a coil; a measurement apparatus that actually measures a rolling load and a forward slip of the slab rolled with the in-line mill; and a lubrication control apparatus configured to:
calculate a friction coefficient from measured values of the rolling load and the forward slip using a rolling analysis model, the rolling analysis model using an Orowan theory and a deformation resistance model formula based on a Shida's approximate formula,
calculate a difference between the friction coefficient that was calculated and a target friction coefficient having a value within a predetermined range, the predetermined range being 0.15 or more and 0.25 or less;
calculate an adjustment amount of a lubrication condition corresponding to the difference that was calculated between the friction coefficient and the target friction coefficient; and
control the lubrication condition during rolling of the slab based on the adjustment amount that was calculated.

6 . The continuous casting equipment according to claim 5 , wherein
a height of each of the protrusions is 50 μm or higher and 100 μm or lower.

7 . The continuous casting equipment according to claim 6 , wherein
the lubrication control apparatus includes a friction coefficient adjuster that calculates a supply amount of lubricating oil required to control the friction coefficient and controls supply of the lubricating oil supplied to the in-line mill.

8 . The continuous casting equipment according to claim 5 , wherein
the lubrication control apparatus includes a friction coefficient adjuster that calculates a supply amount of lubricating oil required to control the friction coefficient and controls supply of the lubricating oil supplied to the in-line mill.

Assignees

• Nippon Steel Corp

Inventors

• Shiraishi Toshiyuki
• Nikkuni Daisuke
• Eto Manabu
• Miyazaki Masafumi

Classifications

• B22D11/055 Primary

  Cooling the moulds {(B22D11/04 takes precedence)} · CPC title

• B21B2001/028

  Slabs · CPC title

• B21B45/0251

  for strips, sheets, or plates · CPC title

• B22D11/0622

  formed by two casting wheels · CPC title

• B22D11/1206

  for plastic shaping of strands (rolling mills B21B1/46) · CPC title