JPH08318306A - Descaling device for hot rolling stock - Google Patents

Descaling device for hot rolling stock

Info

Publication number
JPH08318306A
JPH08318306A JP12544795A JP12544795A JPH08318306A JP H08318306 A JPH08318306 A JP H08318306A JP 12544795 A JP12544795 A JP 12544795A JP 12544795 A JP12544795 A JP 12544795A JP H08318306 A JPH08318306 A JP H08318306A
Authority
JP
Japan
Prior art keywords
nozzle
descaling
scale
angle
descaling device
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
JP12544795A
Other languages
Japanese (ja)
Other versions
JP3386925B2 (en
Inventor
Takehiko Saito
剛彦 齊藤
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.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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 Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP12544795A priority Critical patent/JP3386925B2/en
Publication of JPH08318306A publication Critical patent/JPH08318306A/en
Application granted granted Critical
Publication of JP3386925B2 publication Critical patent/JP3386925B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE: To provide a descaling device with which pealability is improved as compared to conventional descaling, scales are almost peeled by one pass, productivity is raised and thermal loss is reduced. CONSTITUTION: In the descaling device for hot rolled steel sheets, descaling nozzles for spraying water jets in the reverse direction to the passing direction are provided in double-stage in front of a roughing mill, spray angles of the respective nozzles are taken as [the spray angle (θ1 ) of the prestage nozzle] <=[the spray angle (θ2 ) of the poststage nozzle] the spray angle (θ1 ) of the prestage nozzle is taken as 0<=θ1 <=15 deg. and the spray angle (θ2 ) of the poststage nozzle as 20<=θ2 <=40 deg..

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、熱間圧延ラインのデス
ケーリング装置に関し、特にスケール剥離性不良により
圧延材表面に生じるスケール疵を防ぐため、デスケーリ
ングを完全に行なうデスケーリング装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a descaling device for a hot rolling line, and more particularly to a descaling device for completely performing descaling in order to prevent scale defects on the surface of a rolled material due to defective scale peeling.

【0002】[0002]

【従来の技術】従来周知の鋼材の熱間圧延ラインにおい
ては、加熱炉で発生する鋼材表面のスケールを除去する
ために約100〜150kg/cm2のジェットデスケ
ーリング装置を設置し、水ジェットの吹きつけによって
スケールを剥離、除去しながら粗圧延を行なっている。
2. Description of the Related Art In a conventionally well-known hot rolling line for steel products, a jet descaling device of about 100 to 150 kg / cm 2 is installed to remove scales on the surface of steel products generated in a heating furnace. Rough rolling is performed while peeling and removing the scale by spraying.

【0003】前記デスケーリング装置によって剥離でき
ないスケールについては、スラブを複数回リバースさせ
て複数回デスケーリングを繰り返したり、あるいは水圧
をアップさせることによってスケールの剥離性を上げて
いる。
For a scale that cannot be peeled by the descaling device, the peelability of the scale is increased by reversing the slab a plurality of times to repeat descaling a plurality of times or increasing the water pressure.

【0004】前記のデスケーリングにおいては、複数回
スラブをリバースしてデスケーリングを行なうことは生
産性が悪くなり、また、水圧力をアップさせることは電
力原単位が上がるという欠点、問題点が生じる。
In the above-mentioned descaling, the reverse scaling of the slab a plurality of times reduces the productivity, and the increase of the water pressure causes a drawback that the power consumption rate increases. .

【0005】そこで、前記問題点を解決するために、特
開昭57ー103731号公報には、デスケーリングノ
ズルの前で鋼材表面のスケールを冷却し、熱収縮により
スケールにクラックを入れ、その後デスケーリングを行
なってスケールを除去する方法が開示されている。
In order to solve the above problems, Japanese Patent Laid-Open No. 57-103731 discloses that the scale on the surface of the steel material is cooled in front of the descaling nozzle, and the scale is cracked by heat shrinkage, and then the scale is descaled. A method of scaling to remove scale is disclosed.

【0006】また、従来、水ジェットによりデスケーリ
ングを完全に行なうために、デスケーリングの回数ある
いは水ジェットの圧力の指定はあったが、水ジェットの
吹きつけ角度については特に考慮されることなく、ほと
んどのノズルを従前どおり約15°に固定しているのが
現状である。
Further, conventionally, the number of times of descaling or the pressure of the water jet has been specified in order to completely perform the descaling by the water jet, but the spray angle of the water jet is not particularly considered, At present, most nozzles are fixed at about 15 ° as before.

【0007】[0007]

【発明が解決しようとする課題】しかしながら、前記公
報に開示されている方法では、表面を冷却することによ
り熱ロスが大きくなるため、予めスラブ温度を上げてお
かなくてはならないという欠点がある。
However, the method disclosed in the above publication has a drawback that the slab temperature must be raised in advance because the heat loss increases by cooling the surface.

【0008】そこで、本発明は、従来のデスケーリング
に比べて剥離性が向上し、1パスでスケールがほぼ剥離
され、生産性が向上し、熱ロスも低減できるデスケーリ
ング装置を提供するものである。
Therefore, the present invention provides a descaling device which has improved peelability as compared with conventional descaling, scale is almost peeled off in one pass, productivity is improved, and heat loss is reduced. is there.

【0009】[0009]

【課題を解決するための手段】本発明においては、熱間
圧延鋼板のデスケーリング装置において、粗圧延機前に
通板方向と逆方向に水ジェットを吹きつけるデスケーリ
ングノズルを2段設置し、各ノズルの吹きつけ角度を前
段ノズルの吹きつけ角度(θ1)≦後段ノズルの吹きつ
け角度(θ2)とする。
According to the present invention, in a descaling device for hot rolled steel sheets, two stages of descaling nozzles for spraying a water jet in the direction opposite to the sheet passing direction are installed in front of the rough rolling mill. The spraying angle of each nozzle is defined as the spraying angle of the former nozzle (θ 1 ) ≦ the spraying angle of the latter nozzle (θ 2 ).

【0010】特に、前記前段ノズルの吹きつけ角度(θ
1)を0≦θ1≦15°とし、後段ノズルの吹きつけ角度
(θ2)を20°≦θ2≦40°にしてスケールを剥離す
るものである。
Particularly, the spraying angle (θ
1 ) is 0 ≦ θ 1 ≦ 15 °, and the spray angle (θ 2 ) of the latter stage nozzle is 20 ° ≦ θ 2 ≦ 40 °, and the scale is peeled off.

【0011】図2は、各ノズルの角度を変化させてデス
ケーリングの状態について試験した結果を示すグラフ
で、前段ノズルの吹きつけ角(θ1)を0°≦θ1≦15
°、後段ノズルの吹きつけ角度(θ2)を20°≦θ2
40°の範囲とすることによりデスケーリングが完全に
行なわれることが分かる。なお、水圧は従来から採用さ
れているとおりの100〜150kg/cm2の範囲で
ある。
FIG. 2 is a graph showing the results of testing the state of descaling by changing the angle of each nozzle. The blowing angle (θ 1 ) of the preceding nozzle is 0 ° ≦ θ 1 ≦ 15.
°, the spraying angle (θ 2 ) of the latter stage nozzle is 20 ° ≦ θ 2
It can be seen that the descaling is completely performed when the range is 40 °. The water pressure is in the range of 100 to 150 kg / cm 2 as conventionally used.

【0012】[0012]

【作用】本発明によれば、前段ノズルの吹きつけ角度
(θ1)≦後段ノズルの吹きつけ角度(θ2)としたこと
により、前段ノズルの吹きつけによりスケールにクラッ
クが入り、後段ノズルの吹きつけによりクラックの入っ
たスケールを剥離することができる。
According to the present invention, by setting the spraying angle (θ 1 ) of the front stage nozzle ≦ the spraying angle (θ 2 ) of the rear stage nozzle, the spraying of the front stage nozzle causes cracks in the scale, The scale with cracks can be peeled off by spraying.

【0013】[0013]

【実施例】図1により本発明の実施例について説明す
る。
EXAMPLE An example of the present invention will be described with reference to FIG.

【0014】熱間圧延する鋼材4は加熱炉で1200〜
1300°Cに加熱されるが、鋼材の表面は炉内の空気
で酸化され、厚さ数mmのスケール5が生成する。粗圧
延設備1の前には前段のデスケーリングノズル2及び後
段のデスケーリングノズル3の2段からなるデスケーリ
ングノズルが設置され、前段ノズルの吹きつけ角度(θ
1)≦後段ノズルの吹きつけ角度(θ2)に設定されてお
り、前段ノズルの吹きつけによりスケールにクラックを
入れ、次いで後段ノズルの吹きつけによりスケールを剥
離する。
The steel material 4 to be hot-rolled is heated in a heating furnace from 1200 to
Although heated to 1300 ° C, the surface of the steel material is oxidized by the air in the furnace, and the scale 5 having a thickness of several mm is generated. In front of the rough rolling equipment 1, a descaling nozzle consisting of two stages, a descaling nozzle 2 in the former stage and a descaling nozzle 3 in the latter stage, is installed, and the blowing angle (θ
1 ) ≦ The spray angle (θ 2 ) of the rear nozzle is set, and the scale is cracked by spraying the front nozzle, and then the scale is peeled off by spraying the rear nozzle.

【0015】前段ノズル2の吹きつけ角度(θ1)を0
≦θ1≦15°とし、後段ノズルの吹きつけ角度
(θ2)を20°≦θ2≦40°にすることによりスケ
ールを確実に剥離することができる。
The spraying angle (θ 1 ) of the front nozzle 2 is set to 0.
By setting ≦ θ1 ≦ 15 ° and setting the spray angle (θ 2 ) of the latter stage nozzle to 20 ° ≦ θ2 ≦ 40 °, the scale can be reliably peeled off.

【0016】なお、本発明によれば、水ジェット6の圧
力は、従来のデスケーリングで採用されている100〜
150kg/cm2で、なんら変更する必要はない。
According to the present invention, the pressure of the water jet 6 is 100 to 100 which is used in the conventional descaling.
It is 150 kg / cm 2 and does not need to be changed.

【0017】[0017]

【発明の効果】本発明の効果は、次のとおりである。The effects of the present invention are as follows.

【0018】(1) 本発明によれば、従来のデスケー
リングに比べ、完全にスケールを剥離することができる
ため、圧延材表面にスケールに起因するスケール疵がな
くなる。
(1) According to the present invention, the scale can be completely peeled off as compared with the conventional descaling, so that there is no scale flaw on the surface of the rolled material due to the scale.

【0019】(2) 本発明によれば、従来のデスケー
リングに比べ、剥離性が向上するために、1パスでスケ
ールがほぼ剥離されるので、生産性が向上し、従来の複
数パスによる熱ロスも低減できる。
(2) According to the present invention, since the peelability is improved as compared with the conventional descaling, the scale is almost peeled in one pass, so that the productivity is improved and the heat generated by the conventional multiple passes is improved. Loss can also be reduced.

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

【図1】本発明によるデスケーリング装置の説明図。FIG. 1 is an explanatory diagram of a descaling device according to the present invention.

【図2】ノズルの角度を変化させた時のデスケーリング
状態を示すグラフ。
FIG. 2 is a graph showing a descaling state when the nozzle angle is changed.

【符号の説明】[Explanation of symbols]

1 粗圧延機、 2 前段ノズル、 3 後段ノズル、
4 スラブ、 5スケール、 6 水ジェット
1 rough rolling mill, 2 pre-stage nozzles, 3 post-stage nozzles,
4 slabs, 5 scales, 6 water jets

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 熱間圧延鋼板のデスケーリング装置にお
いて、粗圧延機前に通板方向と逆方向に水ジェットを吹
きつけるデスケーリングノズルを2段設置し、各ノズル
の吹きつけ角度を前段ノズルの吹きつけ角度(θ1)≦
後段ノズルの吹きつけ角度(θ2)としたことを特徴と
する熱間圧延素材のデスケーリング装置。
1. A descaling device for hot-rolled steel sheets, wherein two stages of descaling nozzles for spraying a water jet in a direction opposite to the sheet passing direction are installed in front of the rough rolling mill, and the spraying angle of each nozzle is a pre-stage nozzle. Spraying angle (θ 1 ) ≦
Descaling device for hot-rolled material, characterized by the spray angle (θ 2 ) of the latter stage nozzle.
【請求項2】 前記前段ノズルの吹きつけ角度(θ1
を0≦θ1≦15°とし、後段ノズルの吹きつけ角度
(θ2)を20°≦θ2≦40°としたことを特徴とする
請求項1記載の熱間圧延素材のデスケーリング装置。
2. The spraying angle (θ 1 ) of the pre-stage nozzle
Is 0 ≦ θ 1 ≦ 15 °, and the spraying angle (θ 2 ) of the latter stage nozzle is 20 ° ≦ θ 2 ≦ 40 °.
JP12544795A 1995-05-24 1995-05-24 Hot rolling material descaling equipment Expired - Fee Related JP3386925B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12544795A JP3386925B2 (en) 1995-05-24 1995-05-24 Hot rolling material descaling equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12544795A JP3386925B2 (en) 1995-05-24 1995-05-24 Hot rolling material descaling equipment

Publications (2)

Publication Number Publication Date
JPH08318306A true JPH08318306A (en) 1996-12-03
JP3386925B2 JP3386925B2 (en) 2003-03-17

Family

ID=14910316

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12544795A Expired - Fee Related JP3386925B2 (en) 1995-05-24 1995-05-24 Hot rolling material descaling equipment

Country Status (1)

Country Link
JP (1) JP3386925B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101791614A (en) * 2010-03-24 2010-08-04 中国石油集团渤海石油装备制造有限公司 Method for removing scale and dirt from surface of steel plate
JP2013086090A (en) * 2011-10-24 2013-05-13 Tdk Corp Method and device for cleaning using steam

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101791614A (en) * 2010-03-24 2010-08-04 中国石油集团渤海石油装备制造有限公司 Method for removing scale and dirt from surface of steel plate
JP2013086090A (en) * 2011-10-24 2013-05-13 Tdk Corp Method and device for cleaning using steam

Also Published As

Publication number Publication date
JP3386925B2 (en) 2003-03-17

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