JPWO2023281726A5

JPWO2023281726A5 -

Info

Publication number: JPWO2023281726A5
Application number: JP2023533008A
Authority: JP
Filing date: 2021-07-09
Publication date: 2023-12-21
Anticipated expiration: 2041-07-09

Description

本発明に係る浸漬ノズルは、流路と開口部とを備え、基端側から順に、第一部分、接続部分、および第二部分が設けられている浸漬ノズルであって、前記第一部分において、前記流路の横断面形状は円形であり、前記第二部分において、前記流路の横断面形状は矩形であり、前記接続部分において、前記流路の形状は、前記第一部分の前記流路と前記第二部分の前記流路とを連続的に接続する形状であり、前記第二部分において、前記矩形の長辺の長さａと短辺の長さｂとの比ａ／ｂは、３以上７以下であり、前記第二部分における前記流路の断面積Ｓ_２は、前記第一部分における前記流路の断面積Ｓ_１より大きく、前記開口部は、二つの第一開口部と、二つの第二開口部と、を含み、前記第一開口部は、前記第二部分の二つの前記短辺にそれぞれ対応する二つの側面に一つずつ開口しており、二つの前記第二開口部の一方は、二つの前記側面のうちの一方の側面と、前記第二部分の先端の面である底面と、にわたって開口しており、二つの前記第二開口部の他方は、二つの前記側面のうちの他方の側面と、前記底面と、にわたって開口しており、前記第一開口部の前記側面における開口面積Ｓ _３、ならびに、前記第二開口部の前記側面における開口面積Ｓ _４および前記底面における開口面積Ｓ _５は、以下の式（１）および式（２）を満たすことを特徴とする。
Ｓ _４＜Ｓ _５（１）
（Ｓ _４＋Ｓ _５）／Ｓ _３ ≧１．５（２） The immersion nozzle according to the present invention includes a flow path and an opening, and is provided with a first portion, a connection portion, and a second portion in order from the proximal end, wherein the first portion includes the The cross-sectional shape of the flow path is circular, in the second portion, the cross-sectional shape of the flow path is rectangular, and in the connection portion, the flow path has a shape that is similar to that of the flow path in the first portion. It has a shape that continuously connects the flow path of the second part, and in the second part, the ratio a/b of the length a of the long side and the length b of the short side of the rectangle is 3 or more. 7 or less, the cross-sectional area S ₂ of the flow path in the second portion is larger than the cross-sectional area S ₁ of the flow path in the first portion, and the opening portion has two first openings and two a second opening, and the first opening has one opening on each of two side surfaces corresponding to the two short sides of the second portion, and One side is open across one of the two side surfaces and the bottom surface, which is the top surface of the second part, and the other of the two second openings is between the two side surfaces. It is open across the other side surface and the bottom surface, and has an opening area S ₃ on the side surface of the first opening, an opening area S 4 on the side surface of the second opening, and an opening area S ₄ on the side surface of the second opening and the bottom surface. The opening area S5 _is characterized by satisfying the following equations (1) and (2) .
S ₄ <S ₅ (1)
(S ₄ +S ₅ )/S ₃ ≧1.5 (2)

薄スラブ連続鋳造において上記の構成の浸漬ノズルを用いると、メニスカス部分の皮張りを抑制しうる。ノズルから吐出される吐出流は、モールドの短辺に当たり上昇流と下降流に分離する。ここで、上昇流が過度に強い場合はパウダーの巻き込みなどが生じやすく、下降流が過度に強い場合は介在物や気泡などが浮上しにくい。上記の構成によれば、上昇流と下降流とのバランスが適正化され、過剰なメニスカス流動が抑制されうる。 When the immersion nozzle having the above configuration is used in continuous thin slab casting, skinning of the meniscus portion can be suppressed. The discharge flow discharged from the nozzle hits the short side of the mold and is separated into an upward flow and a downward flow. Here, if the upward flow is too strong, powder is likely to be engulfed, and if the downward flow is too strong, inclusions, bubbles, etc. are difficult to float. According to the above configuration, the balance between the upward flow and the downward flow can be optimized, and excessive meniscus flow can be suppressed.

Claims

An immersion nozzle comprising a flow path and an opening, and in which a first part, a connecting part, and a second part are provided in order from the proximal end,
In the first portion, the cross-sectional shape of the flow path is circular;
In the second portion, the cross-sectional shape of the flow path is rectangular;
In the connection portion, the flow path has a shape that continuously connects the flow path of the first portion and the flow path of the second portion,
In the second portion, the ratio a/b of the length a of the long side and the length b of the short side of the rectangle is 3 or more and 7 or less,
A cross-sectional area _S2 of the flow path in the second portion is larger than a cross-sectional area _S1 of the flow path in the first portion,
The openings include two first openings and two second openings,
The first openings are opened one each on two side surfaces corresponding to the two short sides of the second portion,
One of the two second openings is open across one of the two side surfaces and a bottom surface that is a top surface of the second portion,
The other of the two second openings is open across the other of the two side surfaces and the bottom surface,
The opening area S ₃ on the side surface of the first opening , the opening area S ₄ on the side surface and the opening area S ₅ on the bottom surface of the second opening are calculated by the following equations (1) and (2). Filling immersion nozzle.
S ₄ <S ₅ (1)
(S ₄ +S ₅ )/S ₃ ≧1.5 (2)

The immersion nozzle according to claim 1, wherein an opening area _S3 on the side surface of the first opening is smaller than an opening area _S6 on the flow path side.

The immersion nozzle according to claim 1 or 2, wherein the maximum width is 300 mm or less.