Continuous casting mold, continuous casting device, and continuous casting method

Patent metadata

Field	Value
Publication number	US-11045867-B2
Application number	US-202016738141-A
Country	US
Kind code	B2
Filing date	Jan 9, 2020
Priority date	Feb 12, 2019
Publication date	Jun 29, 2021
Grant date	Jun 29, 2021

Abstract

A crack-free continuous casting mold configured so that occurrence of cracks at a casting billet can be reduced even in a case where a casting speed exceeds 500 mm/min. The continuous casting mold continuously casts a casting billet while cooling molten metal by a cooling device provided at a cooling casting mold. The cooling device includes multiple cooling nozzles configured to release coolant water to the casting billet pulled out of the cooling casting mold to cool the casting billet. Multiple ejection ports of the multiple cooling nozzles are arranged along an outer circumferential direction of a surface of the casting billet. Each ejection port has a short side and a long side, and is configured such that the long side is arranged along an axial direction of the casting billet.

First claim

What is claimed is:

1. A continuous casting mold for continuously casting a casting billet while cooling molten metal by a cooling device provided at a cooling casting mold, wherein
the cooling device includes multiple cooling nozzles configured to release coolant water to the casting billet pulled out of the cooling casting mold to cool the casting billet,
multiple ejection ports of the multiple cooling nozzles are arranged along an outer circumferential direction of a surface of the casting billet, and
each ejection port has a short side and a long side, a short axis and a long axis, or a long axis and a center line crossing the long axis, is formed in a shape elongated in a long side direction or a long axis direction, and is configured such that the long side or the long axis is arranged along an axial direction of the casting billet, wherein each ejection port of the cooling nozzles is formed in a rectangular shape, a distance L 1 until completion of solidification after a start of solidification of an ingot forming the casting billet cooled with the coolant water released from each ejection port is set to satisfy Expression (1) below, and a length β of the long side of each ejection port is set to satisfy Expression (2) below:

L
⁢
1

=

(

D
2

-
δ

)

tan
⁢
ψ

[

Expression
⁢

⁢
1

]

[Expression 2] β≥L 1 ×sin φ where in Expressions (1) and (2), L 1 represents the distance (mm) until completion of solidification after the start of solidification of the ingot, D represents a diameter (mm) of the casting billet, δ represents a thickness (mm) of a solidified shell layer of the casting billet, ψ represents a solidification angle (degrees) of a boundary between the molten metal and the solidified ingot with respect to a center line of the casting billet, β represents the length (mm) of the long side of each ejection port, and φ represents an angle (degrees) between a surface of each cooling nozzle perpendicular to a casting direction and an inclined surface.

2. The continuous casting mold according to claim 1 , wherein
each ejection port of the cooling nozzles is formed to have an ejection port short side length of 0.1 mm to 5.0 mm.

3. The continuous casting mold according to claim 2 , wherein a coverage ratio C defined by Expression (3) below is set to 60% to 100% as in Expression (4):

[

Expression
⁢

⁢
3

]

C
=

N
×

(

cos
⁢

⁢
θ
×

(

α
+

β
×
tan
⁢

⁢
θ

)

)

D
⁢

×

⁢
π

×
100

Expression
⁢

⁢

(
3
)

[

Expression
⁢

⁢
4

]

60
≤
C
≤
100

Expression
⁢

⁢

(
4
)

where in Expressions (3) and (4),
C represents the coverage ratio (%),
N represents the number (ports) of ejection ports of the cooling nozzles,
θ represents an inclination angle (degrees) of each ejection port of the cooling nozzles with respect to a radial direction perpendicular to an axis of the casting billet,
α represents a length (mm) of the short side of each ejection port of the cooling nozzles,
β represents a length (mm) of

Assignees

• Kobe Steel Ltd

Inventors

• Konishi Yuki
• Hirukawa Kenichi
• Sawada Hiroki

Classifications

• B22D11/055 Primary

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

• B22D11/22

  for cooling cast stock or mould · CPC title

• B22D11/143

  for horizontal casting · CPC title

• B22D11/04 Primary

  into open-ended moulds (B22D11/06, B22D11/07 take precedence; plants for continuous casting, e.g. for upwardly drawing the strand B22D11/14) · CPC title

• B22D11/207

  responsive to thickness of solidified shell · CPC title