JPH10192951A - Method and device for cooling high temp. steel plate - Google Patents

Method and device for cooling high temp. steel plate

Info

Publication number
JPH10192951A
JPH10192951A JP9006823A JP682397A JPH10192951A JP H10192951 A JPH10192951 A JP H10192951A JP 9006823 A JP9006823 A JP 9006823A JP 682397 A JP682397 A JP 682397A JP H10192951 A JPH10192951 A JP H10192951A
Authority
JP
Japan
Prior art keywords
cooling water
steel plate
nozzle
steel sheet
width direction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP9006823A
Other languages
Japanese (ja)
Other versions
JP3747546B2 (en
Inventor
Teruo Fujibayashi
晃夫 藤林
Hiroshi Kibe
洋 木部
Satoshi Kamioka
悟史 上岡
Shogo Tomita
省吾 冨田
Naoto Hirata
直人 平田
Isao Takahashi
高橋  功
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP00682397A priority Critical patent/JP3747546B2/en
Publication of JPH10192951A publication Critical patent/JPH10192951A/en
Application granted granted Critical
Publication of JP3747546B2 publication Critical patent/JP3747546B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B45/00Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203Cooling
    • B21B45/0209Cooling devices, e.g. using gaseous coolants
    • B21B45/0215Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0233Spray nozzles, Nozzle headers; Spray systems

Abstract

PROBLEM TO BE SOLVED: To uniformly cool a steel plate without generating irregularity in the width direction of the steel plate by demarcating a nozzle to plural nozzle chambers in the width direction with partition walls, adjusting a cooling water quantity of the nozzle chamber and controlling so that a cooling water quantity at both end parts is smaller than a cooling water quantity at the center part of the steel plate. SOLUTION: A cooling water injection mouth 8 of a skirt part 7/a skirt tip part of an upper slit nozzle/a lower part nozzle is demarcated to plural nozzle chambers 10 in the width direction of the steel plate. Water supply pipes 11 branched from a header pipe 6 are connected to each nozzle chamber 10 and arranged with flow rate regulating valves 12 and butterfly valves 13. A cooling water quantity of each nozzle chamber 10 is regulated by the flow rate regulating valve 12 and subjected to ON/OFF by the butterfly valve 13. By supplying a cooling water quantity suitable corresponding to a plate width of the steel plate to be cooled, excessive cooling of both ends of the steel plate is prevented.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】この発明は、熱間圧延された
高温鋼板を板幅方向に均一に冷却するための冷却方法お
よび冷却装置に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling method and a cooling apparatus for uniformly cooling a hot-rolled high-temperature steel sheet in the width direction.

【0002】[0002]

【従来の技術】熱間圧延された高温の鋼板は、一般に圧
延直後の水冷中に、温度分布や鋼板の形状または表面状
態の相違に起因して冷却むらが生じ、生成した冷却むら
のために、冷却後の鋼板に、変形、残留応力、材質のバ
ラツキなどの発生や、鋼板の変形による操業上のトラブ
ルが生じやすい。更に、鋼板が変形した場合には、圧延
後の精整工程においてプレスや矯正機等による成形作業
が必要になるために、コスト高になることが避けられな
かった。
2. Description of the Related Art Generally, hot-rolled high-temperature steel sheets have uneven cooling due to differences in temperature distribution and the shape or surface condition of the steel sheets during water cooling immediately after rolling. In addition, deformation, residual stress, unevenness of the material, etc., occur in the cooled steel sheet, and operation troubles due to the deformation of the steel sheet are likely to occur. Further, when the steel sheet is deformed, a forming operation using a press, a straightening machine, or the like is required in a refining process after rolling, so that an increase in cost cannot be avoided.

【0003】上述した問題を解決し、高温の鋼板を均一
に冷却するための装置や方法が従来から種々提案されて
いる。圧延後の高温の鋼板をオンラインで移送しながら
冷却する手段としては、水平に移送される鋼板の上下面
に対し、その板幅方向に冷却水を噴射して冷却すること
が一般的である。このとき、鋼板の板幅方法の冷却が均
一になるように冷却水の流量を調整して、板幅方向両端
部の冷却を制御することが重要である。
Various devices and methods for solving the above-mentioned problems and uniformly cooling a high-temperature steel plate have been proposed. As a means for cooling the hot-rolled steel sheet while transferring it on-line, cooling water is generally sprayed on the upper and lower surfaces of the horizontally transferred steel sheet in the width direction of the steel sheet to cool the steel sheet. At this time, it is important to control the cooling at both ends in the sheet width direction by adjusting the flow rate of the cooling water so that the cooling in the sheet width method becomes uniform.

【0004】通常、熱間圧延直後の鋼板の冷却手段とし
ては、鋼板の板幅方向に設けられたスリット状のラミナ
ーノズルまたは円管状のラミナーノズルから、ラミナー
状の冷却水を鋼板に向けて注水し、冷却することが一般
的に行われており、鋼板の板幅方向の冷却を均一に行う
手段として、例えば、次のような発明が開示されてい
る。
[0004] Usually, as a cooling means of the steel sheet immediately after hot rolling, laminar cooling water is injected toward the steel sheet from a slit-shaped laminar nozzle or a tubular laminar nozzle provided in the width direction of the steel sheet. Cooling is generally performed, and the following inventions are disclosed as means for uniformly cooling the steel sheet in the width direction.

【0005】(1) 特開昭55−153616号公報:ス
リット状のラミナーノズルから噴射される板幅中央部の
流量密度が、板幅端部の流量密度よりも大になるよう
に、板幅中央部からの距離の関数として、冷却水の流量
を分布し、鋼板端部の過冷却を防止する(以下、先行技
術1という)。
(1) Japanese Patent Application Laid-Open No. 55-153616: The width of the plate is adjusted so that the flow density at the center of the width of the plate sprayed from the slit laminar nozzle is larger than the flow density at the end of the width of the plate. Distributing the flow rate of cooling water as a function of the distance from the center to prevent overcooling of the steel plate end (hereinafter referred to as Prior Art 1).

【0006】(2) 特開昭58−32511号公報 鋼板端部の過冷却によるむらの発生を防止し、鋼板の幅
方向に多数設けられた円管ラミナーノズルからの流下水
による鋼板端部の過冷却を防止するために、鋼板端部の
円管ラミナーノズルの直下に遮蔽物を設け、鋼板端部に
流下する冷却水をカットする(以下、先行技術2とい
う)。 (3) 特開平1−284419公報:鋼板中央部と鋼板端
部とに選択的に注水するノズルを、鋼板の長さ方向に交
互に分割して配置し、それぞれの部位の冷却水量を制御
する(以下、先行技術3という)。
(2) Japanese Patent Application Laid-Open No. 58-32511 Unevenness due to supercooling of the steel plate end is prevented, and the steel plate end is caused by water flowing down from a large number of circular laminar nozzles provided in the width direction of the steel plate. In order to prevent overcooling, a shield is provided immediately below the circular tube laminar nozzle at the end of the steel plate to cut the cooling water flowing down to the end of the steel plate (hereinafter referred to as Prior Art 2). (3) Japanese Patent Application Laid-Open No. 1-284419: Nozzles for selectively injecting water into the central portion and the end portions of the steel plate are alternately arranged in the longitudinal direction of the steel plate to control the amount of cooling water in each portion. (Hereinafter referred to as Prior Art 3).

【0007】[0007]

【発明が解決しようとする課題】しかしながら、上述し
た先行技術1の方法の場合、関数通りの流量で冷却水を
流すことは、ノズルの本数の多い円管ラミナーノズルで
は可能であるが、厚鋼板を冷却する場合のように、強冷
却が必要な即ち流量密度が大きいスリット状ラミナーノ
ズルの場合には、幅方向の流量をこの式に応じて制御す
ることは不可能である。更に、スリット状ラミナーノズ
ルから流下した冷却水が鋼板上を流れ、鋼板の幅方向端
部から流出するので、鋼板端部の過冷却を防止すること
は不可能であった。
However, in the case of the above-mentioned prior art 1, it is possible to flow cooling water at a flow rate according to a function with a circular laminar nozzle having a large number of nozzles. In the case of a slit laminar nozzle that requires strong cooling, that is, has a large flow density, as in the case of cooling a fin, it is impossible to control the flow rate in the width direction according to this equation. Further, since the cooling water flowing down from the slit laminar nozzle flows on the steel sheet and flows out from the widthwise end of the steel sheet, it has been impossible to prevent overcooling of the steel sheet end.

【0008】先行技術2および先行技術3の方法の場合
には、流下した冷却水が結局鋼板上を流れ、鋼板端部か
ら流出するため、鋼板端部に流下する冷却水をカットし
ても鋼板端部の過冷却を防止することは不可能であっ
た。
In the methods of Prior Art 2 and Prior Art 3, since the cooling water that has flowed down eventually flows over the steel sheet and flows out from the end of the steel sheet, even if the cooling water that flows down to the end of the steel sheet is cut, the cooling water flowing down the steel sheet is cut. It was not possible to prevent overcooling of the ends.

【0009】このように、従来の方法では、鋼板端部の
過冷却による冷却むらを防止することができず、鋼板に
過冷却による筋状の材質欠陥が生じ、冷却後の鋼板の曲
がりやキャンバーの発生を防止することができなかっ
た。
As described above, in the conventional method, it is not possible to prevent uneven cooling due to overcooling of the steel plate end portion, and a streak-like material defect occurs in the steel plate due to overcooling, and the bent or cambered steel plate after cooling. Could not be prevented.

【0010】従って、この発明の目的は、上述した問題
を解決し、熱間圧延された高温鋼板を冷却するに際し、
その板幅方向にむらの生ずることがなく、均一に冷却す
ることができる、高温鋼板の冷却方法および冷却装置を
提供することにある。
[0010] Accordingly, an object of the present invention is to solve the above-mentioned problems, and to cool a hot-rolled hot steel sheet.
An object of the present invention is to provide a cooling method and a cooling device for a high-temperature steel sheet, which can be uniformly cooled without causing unevenness in the sheet width direction.

【0011】[0011]

【課題を解決するための手段】請求項1に記載の発明
は、上下に1対の拘束ロールが一定ピッチで複数組設け
られているテーブルローラ上を移送される高温の鋼板
を、前記複数組の拘束ロール間に、前記鋼板の上面に向
けて設けられた上部スリットノズルおよび前記鋼板の下
面に向けて設けられた下部スリットノズルの各々から噴
射される冷却水によって冷却する、高温鋼板の冷却方法
において、前記上部スリットノズルおよび前記下部スリ
ットノズルの各々を、隔壁によって幅方向に複数のノズ
ル室に区画し、このように、隔壁によって区画されたノ
ズル室から鋼板に対し噴射される冷却水の噴射量を、前
記鋼板の中央部に対する噴射量よりも、前記鋼板の両端
部に対する噴射量の方が少なくなるように制御すること
に特徴を有するものである。
According to a first aspect of the present invention, a plurality of sets of high-temperature steel sheets transferred on a table roller provided with a plurality of sets of a pair of restraining rolls at a constant pitch are provided. Between the constraining rolls, a cooling method for cooling the high-temperature steel sheet by cooling water injected from each of an upper slit nozzle provided toward the upper surface of the steel sheet and a lower slit nozzle provided toward the lower surface of the steel sheet. In the above, each of the upper slit nozzle and the lower slit nozzle is partitioned into a plurality of nozzle chambers in the width direction by partition walls, and thus, the injection of cooling water injected from the nozzle chambers partitioned by the partition walls onto the steel plate The amount is controlled such that the injection amount to both ends of the steel sheet is smaller than the injection amount to the central part of the steel sheet. That.

【0012】請求項2に記載の発明は、熱間圧延された
高温の鋼板を挟んで、その上下に1対の拘束ロールが一
定ピッチで複数組設けられ、前記複数組の拘束ロールの
相互間には、前記鋼板の上面に向け冷却水を噴射するた
めの上部スリットノズルおよび前記鋼板の下面に向け冷
却水を噴射するための下部スリットノズルが設けられて
いる高温鋼板の冷却装置において、前記上部スリットノ
ズルおよび前記下部スリットノズルの各々は、隔壁によ
って鋼板の板幅方向に複数のノズル室に区画されてお
り、このように区画された複数のノズル室の各々には、
冷却水の流量制御機構が設けられており、前記上部スリ
ットノズルおよび前記下部スリットノズルから前記鋼板
に向けて噴射される冷却水の流量が、前記鋼板の幅方向
に制御可能になっていることに特徴を有するものであ
る。
According to a second aspect of the present invention, a plurality of pairs of constraining rolls are provided at a constant pitch above and below a hot-rolled high-temperature steel plate. The high-temperature steel plate cooling device, wherein an upper slit nozzle for injecting cooling water toward the upper surface of the steel plate and a lower slit nozzle for injecting cooling water toward the lower surface of the steel plate are provided. Each of the slit nozzle and the lower slit nozzle is divided into a plurality of nozzle chambers in the width direction of the steel plate by the partition walls, and in each of the plurality of nozzle chambers thus partitioned,
A cooling water flow control mechanism is provided, and the flow rate of the cooling water injected toward the steel sheet from the upper slit nozzle and the lower slit nozzle can be controlled in the width direction of the steel sheet. It has features.

【0013】[0013]

【発明の実施の形態】次に、この発明を図面を参照しな
がら説明する。図1は、この発明の装置の一実施態様を
示す概略斜視図、図2は、スリットノズル部分の拡大概
略斜視図である。図1および図2に示すように、鋼板1
を挟んでその上下に1対の拘束ロール2,3が一定ピッ
チ(例えば1000mmピッチ)で複数組(例えば20
組)設けられており、拘束ロール2,3の各組相互間の
鋼板上面側には、鋼板移送方向の上流側ロールから下流
側ロールに向けた上部スリットノズル4が設けられ、そ
して、鋼板下面側には、同じく鋼板移送方向の上流側ロ
ールから下流側ロールに向けた下部スリットノズル5が
設けられ、これらによって冷却ゾーンを形成している。
Next, the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view showing an embodiment of the apparatus of the present invention, and FIG. 2 is an enlarged schematic perspective view of a slit nozzle portion. As shown in FIG. 1 and FIG.
A pair of constraining rolls 2 and 3 are provided above and below at a constant pitch (for example, 1000 mm pitch).
An upper slit nozzle 4 is provided on the upper surface side of the steel sheet between each pair of the constraint rolls 2 and 3 from the upstream roll to the downstream roll in the steel sheet transport direction, and On the side, a lower slit nozzle 5 is also provided from the upstream roll to the downstream roll in the steel sheet transfer direction, and these form a cooling zone.

【0014】上部スリットノズル4および下部スリット
ノズル5は、ノズルに冷却水を供給するヘッダー管6
と、ヘッダー管6に取り付けられた、鋼板の移送方向に
屈曲すスカート部7と、その先端の冷却水吐出口8とか
らなっている。
An upper slit nozzle 4 and a lower slit nozzle 5 are provided with a header pipe 6 for supplying cooling water to the nozzle.
And a skirt portion 7 attached to the header tube 6 and bent in the direction in which the steel sheet is transported, and a cooling water discharge port 8 at the tip thereof.

【0015】上述した構造の上部スリットノズル4およ
び下部スリットノズル5の各々のスカート部7およびス
カート部先端の冷却水噴射口8は、隔壁9によって鋼板
の板幅方向に複数のノズル室10に区画されており、ス
カート部7が接続されているヘッダー管6も、複数のノ
ズル室10毎に隔壁9によって複数の室に区画されてい
る。スカート部7およびスカート部先端の冷却水噴射口
8を区画する隔壁9は、合流に際して冷却水中に乱流が
生じないように、滑らかな流線形状になっている。
The skirt portion 7 of each of the upper slit nozzle 4 and the lower slit nozzle 5 having the above-described structure and the cooling water injection port 8 at the tip of the skirt portion are partitioned into a plurality of nozzle chambers 10 by a partition wall 9 in the width direction of the steel plate. The header tube 6 to which the skirt portion 7 is connected is also divided into a plurality of chambers by the partition walls 9 for each of the plurality of nozzle chambers 10. The skirt portion 7 and the partition wall 9 that defines the cooling water injection port 8 at the tip of the skirt portion have a smooth streamline shape so that turbulence does not occur in the cooling water at the time of merging.

【0016】このように区画されたヘッダー管6の各室
毎に、冷却水供給管11が取り付けられており、冷却水
供給管11の途中には、独立して冷却水の流量を制御す
ることができる流量調整弁12、および、独立してO
N,OFF制御を行うことができるバタフライ弁13が
設けられている。
A cooling water supply pipe 11 is attached to each of the compartments of the header pipe 6 partitioned as described above. In the middle of the cooling water supply pipe 11, the flow rate of the cooling water can be independently controlled. Flow control valve 12 and O
A butterfly valve 13 capable of performing N, OFF control is provided.

【0017】この発明の装置は、上述のように構成され
ているので、冷却される鋼板1の板幅に応じ、適切な量
の冷却水を供給することができ、鋼板両端部に対する冷
却水の供給量を鋼板中央部に対する供給量よりも少なく
することによって、鋼板両端部の過冷却を防止すること
ができる。
Since the apparatus of the present invention is configured as described above, an appropriate amount of cooling water can be supplied according to the width of the steel sheet 1 to be cooled, and the cooling water is supplied to both ends of the steel sheet. By making the supply amount smaller than the supply amount to the central portion of the steel plate, it is possible to prevent the supercooling of both ends of the steel plate.

【0018】[0018]

【実施例】次に、この発明を実施例により説明する。 〔実施例1〕板幅2800mm、長さ28m、厚さ32m
m、初期温度920℃の熱間圧延後の厚鋼板を、図1お
よび図2に示した冷却装置に20mpm の速度で通過さ
せ、鋼板の両端部0.2mずつの冷却水が絞られる下記
条件で冷却した。
Next, the present invention will be described with reference to embodiments. [Example 1] Board width 2800 mm, length 28 m, thickness 32 m
The thick steel sheet after hot rolling at an initial temperature of 920 ° C. is passed through the cooling device shown in FIGS. 1 and 2 at a speed of 20 mpm, and the cooling water at both ends of the steel sheet is squeezed by 0.2 m at the following conditions. And cooled.

【0019】 拘束ロール :1000mmピッチ 上部及び下部スリットノズル: 幅 :5m スリットギャップ:10mm ノズル室 :板幅方向に11室に分割 ノズル室の幅 :板幅方向中央部 2m 板幅方向両端部 0.3m 冷却水噴射口角度:鋼板に対し15° 冷却水噴射量密度:中央部及びその両隣部1個の計3個のノズル: 3000l/min mn(冷却幅2.6mに相当) 両端部を含む外側ノズル:1000l/min m 鋼板の板幅方向における冷却水の速度分布は、図3に示
す通りである。熱間圧延後の厚鋼板を上述した条件で冷
却装置に通し、30秒経過した段階で、鋼板板幅方向の
温度プロファイルを測定した。測定結果を図4に示す。
Restraining roll: 1000 mm pitch Upper and lower slit nozzles: Width: 5 m Slit gap: 10 mm Nozzle chamber: divided into 11 chambers in the board width direction Nozzle chamber width: Central part in the board width direction 2 m Both ends in the board width direction 0. 3m Cooling water injection port angle: 15 ° with respect to steel plate Cooling water injection amount density: 3 nozzles in total at the central part and one on both sides: 3000l / min mn (equivalent to a cooling width of 2.6m) Outside including both ends Nozzle: 1000 l / min m The velocity distribution of the cooling water in the width direction of the steel sheet is as shown in FIG. The thick steel plate after the hot rolling was passed through a cooling device under the above-mentioned conditions, and after 30 seconds had elapsed, the temperature profile in the width direction of the steel plate was measured. FIG. 4 shows the measurement results.

【0020】図4において、(a) は本発明の方法によっ
て冷却したときの板幅方向の温度プロファイルである。
図から明らかなように、本発明方法によれば、板幅方向
に均一に冷却することができた。また、上記によって急
冷された鋼板を、冷却床において常温まで空冷したが、
反り等の歪みは全く発生しなかった。そして、冷却後、
幅方向に400mmの条材に切断したが、キャンバーは発
生せず、また、板幅方向の硬度を測定したが、特に焼き
むらが生ずることはなく、均一な硬度分布にすることが
できた。
FIG. 4A shows a temperature profile in the sheet width direction when cooled by the method of the present invention.
As is clear from the figure, according to the method of the present invention, it was possible to cool uniformly in the sheet width direction. In addition, the steel plate quenched by the above was air-cooled to room temperature in the cooling floor,
No distortion such as warpage occurred. And after cooling,
It was cut into strips having a width of 400 mm in the width direction, but no camber was generated, and the hardness in the width direction of the plate was measured.

【0021】〔実施例2〕板幅4300mm、長さ15
m、厚さ25mm、初期温度890℃の熱間圧延後の厚鋼
板を、図1および図2に示した冷却装置に25mpm の速
度で通過させ、鋼板の両端部0.25mずつの冷却水が
絞られる下記条件で冷却した。
[Embodiment 2] Board width 4300 mm, length 15
The hot-rolled thick steel sheet having a thickness of 25 mm and an initial temperature of 890 ° C. was passed through the cooling device shown in FIGS. 1 and 2 at a speed of 25 mpm, and cooling water at both ends of the steel sheet was discharged at a rate of 0.25 m. It was cooled under the following conditions to be squeezed.

【0022】 拘束ロール :1000mmピッチ 上部及び下部スリットノズル: 幅 :5m スリットギャップ:10mm ノズル室 :板幅方向に11室に分割 ノズル室の幅 :板幅方向中央部 2m 板幅方向両端部 0.3m 冷却水噴射口角度:鋼板に対し15° 冷却水噴射量密度:中央部及びその両隣部3個の計7個のノズル: 3000l/min mn(冷却幅2.6mに相当) 両端部を含む外側ノズル:1000l/min m 図4の(b) は、上述した方法によって冷却したときの、
板幅方向の温度プロファイルである。図から明らかなよ
うに、本発明方法によれば、板幅方向に均一に冷却する
ことができた。また、上記によって急冷された鋼板を、
冷却床において常温まで空冷したが、反り等の歪みは全
く発生しなかった。そして、冷却後、幅方向に400mm
の条材に切断したが、キャンバーは発生せず、また、板
幅方向の硬度を測定したが、特に焼きむらが生ずること
はなく、均一な硬度分布にすることができた。
Constraining roll: 1000 mm pitch Upper and lower slit nozzles: Width: 5 m Slit gap: 10 mm Nozzle chamber: divided into 11 chambers in the board width direction Nozzle chamber width: Central part in the board width direction 2 m Both ends in the board width direction 0. 3m Cooling water injection port angle: 15 ° with respect to steel plate Cooling water injection amount density: 7 nozzles in total at the center and on both sides: 3000l / min mn (equivalent to a cooling width of 2.6m) Outside including both ends Nozzle: 1000 l / min m FIG. 4 (b) shows the result of cooling by the method described above.
It is a temperature profile in a board width direction. As is clear from the figure, according to the method of the present invention, it was possible to cool uniformly in the sheet width direction. Also, the steel plate quenched by the above,
After cooling to room temperature in the cooling bed, no distortion such as warpage occurred. And after cooling, 400mm in the width direction
No camber was generated, and the hardness was measured in the width direction of the sheet. As a result, no uneven baking occurred and a uniform hardness distribution was obtained.

【0023】〔比較例〕実施例1と同じ装置を使用し、
板幅2800mm、長さ28m、厚さ32mm、初期温度9
20℃の熱間圧延後の厚鋼板を20mpm の速度で通過さ
せ、下記条件で冷却した。
Comparative Example Using the same apparatus as in Example 1,
Board width 2800mm, length 28m, thickness 32mm, initial temperature 9
The steel plate after the hot rolling at 20 ° C. was passed at a speed of 20 mpm and cooled under the following conditions.

【0024】 拘束ロール :1000mmピッチ 上部及び下部スリットノズル: 幅 :5m スリットギャップ :10mm ノズル室 :板幅方向に11室に分割 ノズル室の幅 :板幅方向中央部 2m 板幅方向両端部 0.3m 冷却水噴射口角度 :鋼板に対し15° 冷却水噴射量密度 :中央部及びその両隣部2個の計5個のノズル: 3000l/min mn(冷却幅3.2mに相当) 両端部を含む外側ノズル:3000l/min m 図4の(c) は、上述した方法によって冷却したときの、
板幅方向の温度プロファイルである。図から明らかなよ
うに、比較例の如く区画した各ノズル室からの冷却水噴
射量密度が同じ場合には、板幅方向端部には低温帯が存
在し、過冷却になった。また、上記によって急冷された
鋼板を、冷却床において常温まで空冷したところ、C反
りが発生した。そして、冷却後、幅方向に400mmの条
材に切断したが、分割されたスリットノズルの下流部分
を含む条材にはキャンバーが発生した。また、板幅方向
の硬度を測定したところ、分割した板端部には焼きむら
による硬度の低い部分が存在していた。
Constraining roll: 1000 mm pitch Upper and lower slit nozzles: Width: 5 m Slit gap: 10 mm Nozzle chamber: divided into 11 chambers in the board width direction Nozzle chamber width: Central part in the board width direction 2 m Both ends in the board width direction 0. 3m cooling water injection port angle: 15 ° with respect to steel plate Cooling water injection amount density: 5 nozzles in total at the central part and two adjacent parts: 3000 l / min mn (equivalent to a cooling width of 3.2 m) Outside including both ends Nozzle: 3000 l / min m (c) of FIG.
It is a temperature profile in a board width direction. As is clear from the figure, when the cooling water injection amount density from each of the partitioned nozzle chambers was the same as in the comparative example, a low-temperature zone was present at the end in the plate width direction, and supercooling occurred. When the steel sheet quenched as described above was air-cooled to a normal temperature in a cooling floor, C warpage occurred. After cooling, the strip was cut into 400 mm in the width direction, but camber occurred in the strip including the downstream portion of the split slit nozzle. Further, when the hardness in the width direction of the plate was measured, a portion having a low hardness due to uneven baking was present at the end of the divided plate.

【0025】[0025]

【発明の効果】以上述べたように、この発明によれば、
熱間圧延された高温鋼板を冷却するに際し、鋼板の幅方
向に制御可能に冷却水を噴射することができるので、板
幅方向にむらの生ずることがなく、均一な冷却を行うこ
とができ、歪みの発生が防止され、鋼板の形状不良が皆
無になると共に、各種サイズの鋼板に適した量の冷却水
を噴射することができるから、冷却水の無駄がなくなっ
て経済性が向上する等、多くの工業上有用な効果がもた
らされる。
As described above, according to the present invention,
In cooling the hot-rolled high-temperature steel sheet, since cooling water can be jetted in a controllable manner in the width direction of the steel sheet, there is no unevenness in the width direction of the steel sheet, and uniform cooling can be performed. The generation of distortion is prevented, the shape defect of the steel sheet is eliminated, and the amount of cooling water suitable for steel sheets of various sizes can be injected, so that cooling water is not wasted and economic efficiency is improved. Many industrially useful effects are provided.

【図面の簡単な説明】[Brief description of the drawings]

【図1】この発明の装置の一実施態様を示す概略斜視図
である。
FIG. 1 is a schematic perspective view showing an embodiment of the apparatus of the present invention.

【図2】スリットノズルの拡大概略斜視図である。FIG. 2 is an enlarged schematic perspective view of a slit nozzle.

【図3】鋼板の板幅方向における冷却水の速度分布を示
す図である。
FIG. 3 is a diagram illustrating a velocity distribution of cooling water in a width direction of a steel sheet.

【図4】鋼板板幅方向の温度プロファイルを示す図であ
る。である。
FIG. 4 is a view showing a temperature profile in a width direction of a steel sheet. It is.

【符号の説明】[Explanation of symbols]

1 鋼板 2 拘束ロール 3 拘束ロール 4 上部スリットノズル 5 下部スリットノズル 6 ヘッダー管 7 スカート部 8 噴射口 9 隔壁 10 ノズル室 11 冷却水供給管 12 流量調整弁 13 バタフライ弁 DESCRIPTION OF SYMBOLS 1 Steel plate 2 Restraining roll 3 Restraining roll 4 Upper slit nozzle 5 Lower slit nozzle 6 Header pipe 7 Skirt part 8 Injection port 9 Partition wall 10 Nozzle room 11 Cooling water supply pipe 12 Flow control valve 13 Butterfly valve

───────────────────────────────────────────────────── フロントページの続き (72)発明者 冨田 省吾 東京都千代田区丸の内一丁目1番2号 日 本鋼管株式会社内 (72)発明者 平田 直人 東京都千代田区丸の内一丁目1番2号 日 本鋼管株式会社内 (72)発明者 高橋 功 東京都千代田区丸の内一丁目1番2号 日 本鋼管株式会社内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shogo Tomita 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Naoto Hirata 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Sun (72) Inventor: Isao Takahashi 1-1-2, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd.

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 上下に1対の拘束ロールが一定ピッチで
複数組設けられているテーブルローラ上を移送される高
温の鋼板を、前記複数組の拘束ロール間に、前記鋼板の
上面に向けて設けられた上部スリットノズルおよび前記
鋼板の下面に向けて設けられた下部スリットノズルの各
々から噴射される冷却水によって冷却する、高温鋼板の
冷却方法において、 前記上部スリットノズルおよび前記下部スリットノズル
の各々を、隔壁によって幅方向に複数のノズル室に区画
し、このように、隔壁によって区画されたノズル室から
鋼板に対し噴射される冷却水の噴射量を、前記鋼板の板
幅方向中央部に対する噴射量よりも、前記鋼板の板幅方
向両端部に対する噴射量の方が少なくなるように制御す
ることを特徴とする、高温鋼板の冷却方法。
1. A high-temperature steel sheet transported on a table roller provided with a plurality of sets of a pair of upper and lower restraining rolls at a constant pitch is directed between the plurality of restraining rolls toward the upper surface of the steel sheet. A method for cooling a high-temperature steel sheet, wherein cooling is performed by cooling water injected from each of an upper slit nozzle provided and a lower slit nozzle provided toward a lower surface of the steel sheet, wherein each of the upper slit nozzle and the lower slit nozzle is provided. Is divided into a plurality of nozzle chambers in the width direction by the partition walls. In this manner, the injection amount of the cooling water injected to the steel sheet from the nozzle chambers partitioned by the partition walls is injected to the central portion in the plate width direction of the steel sheets. A method for cooling a high-temperature steel sheet, characterized in that the injection amount of the steel sheet to both ends in the sheet width direction is controlled to be smaller than the injection amount.
【請求項2】 熱間圧延された高温の鋼板を挟んで、そ
の上下に1対の拘束ロールが一定ピッチで複数組設けら
れ、前記複数組の拘束ロールの相互間には、前記鋼板の
上面に向け冷却水を噴射するための上部スリットノズル
および前記鋼板の下面に向け冷却水を噴射するための下
部スリットノズルが設けられている高温鋼板の冷却装置
において、 前記上部スリットノズルおよび前記下部スリットノズル
の各々は、隔壁によって鋼板の板幅方向に複数のノズル
室に区画されており、このように区画された複数のノズ
ル室の各々には、冷却水の流量制御機構が設けられてお
り、前記上部スリットノズルおよび前記下部スリットノ
ズルから前記鋼板に向けて噴射される冷却水の流量が、
前記鋼板の板幅方向に制御可能になっていることを特徴
とする、高温鋼板の冷却装置。
2. A plurality of sets of a pair of restraining rolls are provided at a constant pitch above and below a hot-rolled high-temperature steel sheet, and an upper surface of the steel sheet is provided between the plurality of sets of restraining rolls. A high-temperature steel plate cooling device provided with an upper slit nozzle for injecting cooling water toward and a lower slit nozzle for injecting cooling water toward the lower surface of the steel plate, wherein the upper slit nozzle and the lower slit nozzle Are partitioned into a plurality of nozzle chambers in the width direction of the steel plate by the partition walls, and each of the plurality of nozzle chambers partitioned in this manner is provided with a flow rate control mechanism for cooling water, The flow rate of the cooling water injected toward the steel plate from the upper slit nozzle and the lower slit nozzle,
A cooling device for a high-temperature steel plate, wherein the cooling device can be controlled in a width direction of the steel plate.
JP00682397A 1997-01-17 1997-01-17 Method and apparatus for cooling high temperature steel sheet Expired - Fee Related JP3747546B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP00682397A JP3747546B2 (en) 1997-01-17 1997-01-17 Method and apparatus for cooling high temperature steel sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP00682397A JP3747546B2 (en) 1997-01-17 1997-01-17 Method and apparatus for cooling high temperature steel sheet

Publications (2)

Publication Number Publication Date
JPH10192951A true JPH10192951A (en) 1998-07-28
JP3747546B2 JP3747546B2 (en) 2006-02-22

Family

ID=11648948

Family Applications (1)

Application Number Title Priority Date Filing Date
JP00682397A Expired - Fee Related JP3747546B2 (en) 1997-01-17 1997-01-17 Method and apparatus for cooling high temperature steel sheet

Country Status (1)

Country Link
JP (1) JP3747546B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012040575A (en) * 2010-08-16 2012-03-01 Sumitomo Metal Ind Ltd Method of determining refrigerant flow rate and cooling device for steel plate
JP2014051695A (en) * 2012-09-05 2014-03-20 Ihi Corp Heat treatment apparatus, and heat treatment method
KR101461728B1 (en) * 2012-12-21 2014-11-14 주식회사 포스코 Correcting apparatus for heat treatment roll forming
EP2939751A4 (en) * 2012-12-25 2016-01-27 Jfe Steel Corp Cooling method and cooling device for hot-rolled steel strip
US11033942B2 (en) * 2016-08-09 2021-06-15 Toshiba Mitsubishi-Electric Industrial Systems Corporation Rolling mill exit side temperature control system

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JPS62133057A (en) * 1985-12-06 1987-06-16 Nippon Kokan Kk <Nkk> Gas wiping nozzle
JPS62289315A (en) * 1986-06-09 1987-12-16 Kobe Steel Ltd Cooling device for high temperature steel plate
JPS63168216A (en) * 1986-12-29 1988-07-12 Ishikawajima Harima Heavy Ind Co Ltd Cooler for metal sheet
JPS63168215A (en) * 1986-12-29 1988-07-12 Ishikawajima Harima Heavy Ind Co Ltd Cooler for metal sheet
JPH01186210A (en) * 1988-01-22 1989-07-25 Ishikawajima Harima Heavy Ind Co Ltd Cooling nozzle for metallic plate

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6037063U (en) * 1983-08-18 1985-03-14 新日本製鐵株式会社 Cooling nozzle protection device
JPS62133057A (en) * 1985-12-06 1987-06-16 Nippon Kokan Kk <Nkk> Gas wiping nozzle
JPS62289315A (en) * 1986-06-09 1987-12-16 Kobe Steel Ltd Cooling device for high temperature steel plate
JPS63168216A (en) * 1986-12-29 1988-07-12 Ishikawajima Harima Heavy Ind Co Ltd Cooler for metal sheet
JPS63168215A (en) * 1986-12-29 1988-07-12 Ishikawajima Harima Heavy Ind Co Ltd Cooler for metal sheet
JPH01186210A (en) * 1988-01-22 1989-07-25 Ishikawajima Harima Heavy Ind Co Ltd Cooling nozzle for metallic plate

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012040575A (en) * 2010-08-16 2012-03-01 Sumitomo Metal Ind Ltd Method of determining refrigerant flow rate and cooling device for steel plate
JP2014051695A (en) * 2012-09-05 2014-03-20 Ihi Corp Heat treatment apparatus, and heat treatment method
KR101461728B1 (en) * 2012-12-21 2014-11-14 주식회사 포스코 Correcting apparatus for heat treatment roll forming
EP2939751A4 (en) * 2012-12-25 2016-01-27 Jfe Steel Corp Cooling method and cooling device for hot-rolled steel strip
EP2939751B1 (en) 2012-12-25 2017-06-07 JFE Steel Corporation Cooling method and cooling device for hot-rolled steel strip
US9833822B2 (en) 2012-12-25 2017-12-05 Jfe Steel Corporation Method and apparatus for cooling hot-rolled steel strip
US11033942B2 (en) * 2016-08-09 2021-06-15 Toshiba Mitsubishi-Electric Industrial Systems Corporation Rolling mill exit side temperature control system

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