JPH06262244A - Continuous hot rolling method for billet - Google Patents

Continuous hot rolling method for billet

Info

Publication number
JPH06262244A
JPH06262244A JP5584093A JP5584093A JPH06262244A JP H06262244 A JPH06262244 A JP H06262244A JP 5584093 A JP5584093 A JP 5584093A JP 5584093 A JP5584093 A JP 5584093A JP H06262244 A JPH06262244 A JP H06262244A
Authority
JP
Japan
Prior art keywords
steel
joining
descaling
billet
billets
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.)
Pending
Application number
JP5584093A
Other languages
Japanese (ja)
Inventor
Takeshi Hirabayashi
毅 平林
Norio Takashima
典生 高島
Katsuhiro Takebayashi
克浩 竹林
Yusaku Fujii
雄作 藤井
Toshisada Takechi
敏貞 武智
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 Steel Corp
Original Assignee
Kawasaki 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 Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP5584093A priority Critical patent/JPH06262244A/en
Publication of JPH06262244A publication Critical patent/JPH06262244A/en
Pending legal-status Critical Current

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  • Metal Rolling (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

PURPOSE:To improve productivity by minimizing generation of scale at the non-joined part of a gap formed when billets are preliminarily joined and stably hot finish rolling under overall joining in the width direction. CONSTITUTION:When continuously hot rolling the billets fed in a group of finish rolls 5 after joining the rear end part of preceding billet 1 and the front end part of following billet 2, during transfer of joined billets, non-joined faces of remaining gap (g) between the billets are continuously jetted with descaling water by a descaling header 4 synchronously moving with the billets.

Description

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

【0001】[0001]

【産業上の利用分野】この発明は、シートバーやスラ
ブ、ビレットあるいはブルーム等の鋼片を数本乃至は数
十本にわたって連続して圧延するのに適した連続熱間圧
延方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous hot rolling method suitable for continuously rolling several to several tens of steel pieces such as sheet bars, slabs, billets and blooms. .

【0002】[0002]

【従来の技術】従来、鋼片の熱間圧延ラインでは、圧延
すべき鋼片を一本ずつ加熱、粗圧延、仕上げ圧延して所
望の厚さになる熱延板に仕上げられていたが、このよう
な圧延方式は、仕上げ圧延での、圧延素材の噛み込み不
良や尻抜け不良によるラインの停止が避けられず、また
圧延素材の先端、後端部の形状不良に起因した歩留り低
下も著しい不利があった。
2. Description of the Related Art Conventionally, in a hot rolling line for billets, the billets to be rolled are individually heated, rough-rolled and finish-rolled to finish a hot-rolled sheet having a desired thickness. In such a rolling method, stoppage of the line due to defective biting of the rolled material or defective removal of the tail is inevitable in finish rolling, and the yield is significantly reduced due to defective shape of the leading end and the trailing end of the rolled material. There was a disadvantage.

【0003】このため、最近では仕上げ圧延に先立って
圧延すべき鋼片の後端部、先端部をつなぎ合わせ、これ
を熱間圧延ラインに連続的に供給して圧延する圧延方式
が採用されるようになってきた。この点に関する先行技
術として特開昭61−144203号公報が参照される。
For this reason, recently, a rolling system has been adopted in which the rear end portion and the front end portion of the steel pieces to be rolled are joined prior to the finish rolling, and this is continuously supplied to the hot rolling line for rolling. It's starting to happen. Reference is made to JP-A-61-144203 as prior art regarding this point.

【0004】上記特開昭61−144203号公報にて開示され
ている技術は、先行して搬送される鋼片 (以下、先行鋼
片という) の後端部と後続して搬送される鋼片 (以下、
後行鋼片という) の先端部をその全面にわたって突き合
わせ、それらの幅方向両端部を予接合しこの状態を保持
したままで圧延しようとするものである。しかしながら
この技術は、予接合部分に十分な接合強度をもたせるた
めには接合時間を長くとる必要があって、そのためにラ
インの延長化を招く不利があった。
The technique disclosed in the above-mentioned Japanese Patent Laid-Open No. 61-144203 is such that a steel piece that is conveyed first (hereinafter referred to as a preceding steel piece) and a steel piece that is conveyed subsequently. (Less than,
The leading end portion of a trailing steel piece) is butted over its entire surface, both widthwise end portions thereof are pre-joined, and rolling is performed while maintaining this state. However, this technique requires a long joining time in order to give a sufficient joining strength to the pre-joint portion, which is disadvantageous in that the line is extended.

【0005】発明者らは、このような問題の解決を図る
ものとして、先行鋼片の後端部と後行鋼片の先端部を接
触させその領域にて鋼片の厚み方向に貫通する交番磁界
を印加しこの交番磁界によって誘起された誘導電流によ
って接合面を加熱するとともに押圧する、加熱・押圧処
理の組み合わせからなる接合方法を開発し、特開平4-89
109 号及び同4-89110 号各公報において開示した。この
接合法の開発により、従来に比べ、接合作業の迅速、簡
便化が可能となった。
The inventors of the present invention have attempted to solve such a problem by alternating the rear end portion of the preceding steel piece and the front end portion of the following steel piece so that the steel piece penetrates in that region in the thickness direction of the steel piece. We have developed a joining method consisting of a combination of heating and pressing, in which a magnetic field is applied and the joint surface is heated and pressed by the induced current induced by this alternating magnetic field.
No. 109 and No. 4-89110. With the development of this joining method, the joining work has become quicker and easier than ever before.

【0006】[0006]

【発明が解決しようとする課題】ところで、上記の接合
方法は、予接合部間に未接合のギャップが存在するた
め、その後の仕上げ圧延においてこのギャップを閉塞さ
せて全面接合とすることが望まれるところ、かかる未接
合面には、クロップシャー等による切断以降の2次スケ
ールが生成 (予接合前のクロップ切断から仕上げ圧延機
到着までに20〜40秒程度の接合・搬送時間を要し、スケ
ールの厚さが30〜50μm 程度となる) し、その厚さ如何
では仕上げ圧延時に全面にわたる接合が完了せず、十分
な接合強度が得られないこともあって板の分離破断を引
き起こすことがあり、この点に多少の改善の余地が残さ
れていた。
By the way, in the above joining method, since there is an unjoined gap between the pre-joined portions, it is desired to close this gap in the subsequent finish rolling to complete the joining. However, a secondary scale after cutting with a crop shear, etc., is generated on such unbonded surface. (It takes about 20 to 40 seconds for bonding and transportation time from crop cutting before pre-bonding to arrival at the finishing rolling mill, Thickness of 30 to 50 μm), and depending on the thickness, the joining over the entire surface during finish rolling may not be completed and sufficient joining strength may not be obtained, which may cause separation fracture of the plate. , There was some room for improvement in this respect.

【0007】なお、通常の熱間圧延ラインでは鋼片表面
に生成する酸化スケールの除去を目的に固定式の脱スケ
ールヘッダーを圧延ラインに沿って1箇所以上配置して
いるため、このようなヘッダーを利用して未接合面での
2次スケールを除去することも考えられるが、かかるヘ
ッダーは鋼片表面のスケールを有効に除去しかつ鋼片の
温度を過度に冷却しないようにデスケーリング水の圧力
や飛散幅、ノズル取付角が設定されているので上記のよ
うな接合方式によって生じたギャップの未接合面に対す
る脱スケールに関しては充分な処理時間が確保できな
い。
In a normal hot rolling line, fixed descaling headers are arranged at one or more locations along the rolling line for the purpose of removing oxide scale formed on the surface of the steel slab. Although it is conceivable to remove the secondary scale on the unbonded surface by utilizing the above, such a header effectively removes the scale on the surface of the billet and does not excessively cool the temperature of the billet. Since the pressure, the scattering width, and the nozzle mounting angle are set, it is not possible to secure a sufficient processing time for descaling of the gap generated by the above-described joining method on the unjoined surface.

【0008】ここに、鋼片表面のスケールを剥離させる
のに必要な処理時間は5〜50msec程度であることが知ら
れていて、例えば鋼片の搬送速度1m/sec ,デスケー
リング水の飛散幅を15mm, デスケーリング水噴射ノズル
の角度を鋼片表面を基準にして15°とすると鋼片表面の
デスケーリングに確保できる処理時間は15×10-3(m)/
1(m/sec) =15(msec)になる。これに対して、未接合面
(鋼片端面) のデスケーリングに確保できる処理時間は
15×10-3(m) /1(m/sec) ÷sin 15°=3.9(msec) であ
り、鋼片の端面でのデスケーリングでは、同一条件下で
鋼片表面のデスケーリング時間の約25%程度しか確保で
きず、脱スケールを充分に行えない不利があった(図4
参照)。端面デスケーリングにおいて必要処理時間を確
保するために鋼片の搬送速度を0.78(m/sec)(約22%の減
速) まで落とせば5msec程度の処理時間を確保すること
ができるが、搬送速度の低下は同時に生産能率を22%低
下させることにもなるし、また、この時点でスケール
(1次スケール) を剥離させることができても仕上げ圧
延群の第1スタンドに到達するまでの時間が長ければそ
の間の復熱による2次スケールの生成は避けられない。
It is known that the processing time required to peel off the scale on the surface of the steel slab is about 5 to 50 msec. For example, the transport speed of the steel slab is 1 m / sec, and the width of the descaling water is scattered. Is 15 mm and the angle of the descaling water injection nozzle is 15 ° with reference to the surface of the slab, the processing time that can be secured for descaling the surface of the slab is 15 × 10 -3 (m) /
It becomes 1 (m / sec) = 15 (msec). On the other hand, unbonded surface
The processing time that can be secured for the descaling of (steel end face) is
15 × 10 -3 (m) / 1 (m / sec) ÷ sin 15 ° = 3.9 (msec). With descaling at the end face of the billet, the descaling time of the billet surface is approximately the same under the same conditions. There was a disadvantage that we could only secure about 25% and could not perform descaling sufficiently (Fig. 4
reference). In order to secure the required processing time for end face descaling, the processing time of about 5 msec can be secured if the transportation speed of the billet is reduced to 0.78 (m / sec) (deceleration of about 22%). At the same time, the decrease will reduce the production efficiency by 22%, and at this point, the scale
Even if the (primary scale) can be peeled off, if the time required to reach the first stand of the finish rolling group is long, generation of secondary scale due to recuperation during that time is unavoidable.

【0009】この発明は、ギャップの未接合面で問題と
なる2次スケールの生成を回避し、仕上げ圧延において
板幅方向全域にわたる接合を可能にして安定した連続熱
間圧延が実施できる方法を提案することを目的とするも
のである。
The present invention proposes a method capable of avoiding the generation of secondary scale, which is a problem in the unbonded surface of the gap, and enabling bonding throughout the strip width direction in finish rolling to perform stable continuous hot rolling. The purpose is to do.

【0010】[0010]

【課題を解決するための手段】この発明は、先行する鋼
片の後端部およびこれに引き続く後続の鋼片の先端部の
それぞれに切断加工を施し、次いで各鋼片をその幅方向
の少なくとも両端部で接合した後に、仕上げ圧延機群に
送給して連続的に熱間圧延するに当たり、接合処理を終
えた鋼片の搬送過程で、鋼片と同期して移動するデスケ
ーリングヘッダーにより鋼片相互間に残存するギャップ
の未接合面に対して継続してデスケーリング水を噴射す
ることを特徴とする熱間圧延における鋼片の接合方法で
ある。
According to the present invention, a cutting process is performed on each of a rear end portion of a preceding steel piece and a leading end portion of a succeeding steel piece that follows the steel piece, and then each steel piece is cut at least in its width direction. After joining at both ends, when it is fed to the finishing rolling mill group and continuously hot-rolled, the steel sheet is moved by the descaling header that moves in synchronization with the billet during the conveying process of the finished billet. A method for joining steel slabs in hot rolling, characterized by continuously injecting descaling water to an unjoined surface of a gap remaining between the pieces.

【0011】[0011]

【作用】接合処理 (予接合) の完了時点では、鋼片相互
の幅方向中央部には概ね5〜50mm程度のギャップが存在
することになる(図2参照)が、このようなギャップが
あっても仕上げ圧延にて鋼片の後端部、先端部の幅方向
中央域のメタルフローを促進させることができれば板幅
方向の全域にわたる接合が可能(図3参照)であり、し
たがってギャップを残したままで鋼片の接合を終える接
合形式では、接合時間の短縮や鋼片を押圧する際の押圧
力の軽減を図るという点では極めて有効な手段といえ
る。
[Function] When the joining process (pre-joining) is completed, there is a gap of approximately 5 to 50 mm in the widthwise central portions of the steel pieces (see Fig. 2), but there is such a gap. Even if the finish rolling can promote the metal flow in the widthwise central region of the rear end and the front end of the steel slab, it is possible to join over the entire width of the strip (see Fig. 3), and thus leave a gap. It can be said that the joining method in which the joining of the steel pieces is finished as it is is an extremely effective means in terms of shortening the joining time and reducing the pressing force when pressing the steel pieces.

【0012】ところがこの時、幅中央部のギャップの未
接合面に2次スケールが生成していると、その厚みによ
っては十分な接合が望み得ないことは、前述したとおり
である。
However, as described above, at this time, if a secondary scale is formed on the unbonded surface of the gap at the center of the width, sufficient bonding cannot be expected depending on the thickness of the secondary scale.

【0013】この発明では、先行鋼片の後端部と後行鋼
片の先端部を予接合したのち、その搬送過程で鋼片と同
期して移動するデスケーリングヘッダーによりギャップ
の未接合面に対して継続してデスケーリング水を噴射し
仕上げ圧延に到達するまでの間でスケールを除去すると
ともに、その後の復熱による2次スケールの生成を抑制
するようにしたので、仕上げ圧延における鋼片の幅方向
中央域のメタルフローの促進による圧接にて予接合部を
除く領域についても金属的に接合され、以降の圧延にお
いてその部分から破断分離するようなことがない充分な
接合強度が得られることになる。
In the present invention, after the pre-bonding of the trailing end of the preceding steel slab and the leading end of the trailing steel slab, the descaling header that moves in synchronism with the steel slab in the process of conveying it is applied to the unbonded surface of the gap. On the other hand, by continuously spraying descaling water and removing the scale until it reaches the finish rolling, the generation of secondary scale due to the subsequent heat recovery is suppressed, so A region other than the pre-bonded part is also metal-bonded by pressure welding due to the promotion of metal flow in the widthwise central region, and sufficient bonding strength that does not cause fracture separation from that part in subsequent rolling can be obtained. become.

【0014】図1は、この発明を実施するのに用いて好
適な設備を示したものであって、図中1は先行鋼片、2
は先行鋼片1に引き続く後行鋼片、3は加熱接合装置で
あって、この加熱接合装置3は切断加工を施した先行鋼
片1の後端部および後行鋼片2の先端部をその板幅方向
の少なくとも両端部において接合する。また、4は台車
4aを備え、接合処理 (予接合) を終えた鋼片1,2の
搬送過程で鋼片と同期して移動(クランプ4bで挟み込
む)するデスケーリングヘッダーであって、このデスケ
ーリングヘッダー4は予接合を施した鋼片の相互間に残
存するギャップg(図1参照)の未接合面に対して仕上
げ圧延機群5に至るまでの間継続してデスケーリング水
を噴射する。
FIG. 1 shows equipment suitable for carrying out the present invention. In FIG.
Is a trailing steel piece following the leading steel piece 1, and 3 is a heating and welding apparatus. The heating and welding apparatus 3 connects the trailing end portion of the leading steel piece 1 and the leading end portion of the trailing steel piece 2 that have been cut. It joins at least both ends of the board width direction. Reference numeral 4 denotes a descaling header which includes a carriage 4a and which moves (sandwiches with a clamp 4b) in synchronization with the steel pieces 1 and 2 after the joining process (pre-bonding) is completed. The scaling header 4 continuously injects descaling water onto the unbonded surfaces of the gap g (see FIG. 1) remaining between the pre-bonded steel pieces until reaching the finish rolling mill group 5. .

【0015】上記の構成になる設備にて鋼片の連続熱間
圧延を行うにはまず、鋼片1, 2のそれぞれに、切断加
工装置(図示省略)を用いて各鋼片の突き合わせ状態で
その幅方向の少なくとも両端が接触するような平面形状
になるように切断加工するか、もしくは鋼片相互の突き
合わせ状態で両者の間にすき間がないように切断加工し
てその後に先行鋼片1の後端部および/または後行鋼片
2の先端部の少なくとも幅方向の両端部に減厚加工を施
す。
In order to carry out continuous hot rolling of the steel pieces in the equipment having the above-mentioned structure, first, a cutting processing device (not shown) is used for each of the steel pieces 1 and 2 in a butt state of the steel pieces. It is cut so as to have a planar shape such that at least both ends in the width direction are in contact with each other, or in a state where the steel pieces are butted to each other so that there is no gap between the two, then the preceding steel piece 1 is cut. At least the widthwise end portions of the trailing end portion and / or the leading end portion of the trailing steel piece 2 are subjected to thickness reduction processing.

【0016】そして、図2に示すように加熱接合装置3
にて、各鋼片1,2を相互に接合すべく加熱・押圧処理
にて鋼片の接合面積を漸次拡大していき、必要とされる
接合代Wが得られた時点で予接合を完了する。ここに、
加熱・押圧処理としては、 1)接合予定部が接触状態又は非接触状態の如何にかかわ
らず、予接合部の温度が目標温度に達した時点で加熱を
停止し、ついで押圧する方法、 2)接合予定部が接触状態又は非接触状態の如何にかかわ
らず、接合予定部の温度が接合可能温度に達したなら
ば、加熱は継続したままで押圧を開始する方法、 3)最初から鋼片同士を押圧し、接触部の加熱も同時に行
う方法、 4)所定の接合代まで押圧したのち、加熱する方法、 など、いずれの方法でもよい。
Then, as shown in FIG.
Then, the joining area of the steel pieces is gradually increased by heating and pressing to join the steel pieces 1 and 2 to each other, and the pre-joining is completed when the required joining margin W is obtained. To do. here,
As the heating / pressing treatment, 1) a method of stopping the heating when the temperature of the pre-bonded part reaches the target temperature and then pressing, regardless of whether the planned joining part is in the contact state or the non-contact state, 2) Regardless of whether the planned joining part is in contact or non-contact state, if the temperature of the planned joining part reaches the joining possible temperature, pressing is started while continuing heating, 3) Steel pieces from the beginning Any method may be used, such as a method of pressing and heating the contact portion at the same time, 4) a method of heating after pressing to a predetermined joining margin.

【0017】次に、デスケーリングヘッダー4のクラン
プ4bにて鋼片をその厚さ方向に挟み込み、台車4aを
デスケーリングヘッダー4とともに仕上げ圧延に向けて
同期移動させ該デスケーリングヘッダー4のノズルから
デスケーリング水を継続して噴射しこれによってギャッ
プgの未接合面のスケールを除去するとともに再びスケ
ールが生成しないようにする。そしてこれにつづく仕上
げ圧延機群5にて鋼片の連続熱間仕上げ圧延を行う。
Next, the steel piece is sandwiched by the clamp 4b of the descaling header 4 in the thickness direction, and the carriage 4a is moved together with the descaling header 4 toward the finish rolling synchronously, and the descaling header 4 descales from the nozzle. The scaling water is continuously jetted to remove the scale on the unbonded surface of the gap g and prevent the scale from being generated again. Then, in the subsequent finishing rolling mill group 5, continuous hot finish rolling of the steel pieces is performed.

【0018】鋼片の復熱による新たな2次スケールの生
成を防止するためにはたとえばC:0.03〜0.07%の低C
鋼においてはその温度を700 ℃以下に冷却すればよいこ
とが別の調査から明らかになっていて、デスケーリング
水の噴射時間 (冷却時間) tは、噴射前の鋼片温度T1
を1000℃、比熱Cを0.151Kcal/kg℃、比重ρを7850kg/m
3,デスケーリング水 (冷却水) の温度をT2 、鋼片表面
間の冷却熱伝達率αを575kcal/m2hr℃、冷却浸透深さd
を3mmとした場合に ρCdLl ΔT1 =α (T1 −T2) lt t=ρCdΔT1 /α (T1 −T2)より t=7850×0.15×3×10-3×(1000 −700)/575 ×(700
−30) ÷3600=10.0秒 であり、上記の条件では鋼片の移動に併せてデスケーリ
ングヘッダー4を10秒程度移動しながらデスケーリング
水を噴射すればよいことになる。これは噴射条件の変更
によって適宜適切な値に設定される。なお、上掲図1で
はデスケーリングヘッダー4をクランプ4bを用いて同
期させる場合を例にして示したが、この発明はこれにの
み限定されるものではなく位置検出センサを備えたもの
など種々の機構のものが採用できる。
In order to prevent the generation of a new secondary scale due to the reheating of the steel billet, for example, C: 0.03 to 0.07% low C
Another study has revealed that the temperature of steel may be cooled to 700 ° C. or lower, and the injection time (cooling time) t of the descaling water is the billet temperature T 1 before injection.
1000 ℃, specific heat C 0.151Kcal / kg ℃, specific gravity ρ 7850kg / m
3 , temperature of descaling water (cooling water) is T 2 , cooling heat transfer coefficient α between the billet surfaces is 575 kcal / m 2 hr ℃, cooling penetration depth d
When is set to 3 mm, ρCdLl ΔT 1 = α (T 1 −T 2 ) lt t = ρCdΔT 1 / α (T 1 −T 2 ) From t = 7850 × 0.15 × 3 × 10 −3 × (1000 −700) / 575 x (700
-30) ÷ 3600 = 10.0 seconds. Under the above conditions, it is sufficient to spray the descaling water while moving the descaling header 4 for about 10 seconds along with the movement of the billet. This is set to an appropriate value by changing the injection condition. Although FIG. 1 above shows the case where the descaling header 4 is synchronized by using the clamp 4b as an example, the present invention is not limited to this, and various types such as those having a position detection sensor are provided. A mechanical type can be adopted.

【0019】[0019]

【実施例】厚さ260 mm, 幅1200mmの低炭素鋼スラブに粗
圧延を施して厚さ30mm, 幅1200mmのシートバーとした
後、切断装置によって先行シートバーの後端部および後
行シートバーの先端部をその突き合わせ状態で幅方向の
端部が接触するような形状にそれぞれ切断し、ついで交
番磁界発生装置からなる加熱接合装置にてシートバーの
幅方向の両端部を予接合(接合代:200mm ,ギャップの
寸法:20mm)し、さらに仕上げ圧延機に到達するまでの
間でシートバーの搬送と同期して移動するデスケーリン
グヘッダーを用いて圧力150 kgf/cm2 , 単位幅当たりの
流量30l/sec/mの条件でギャップの未接合面に対してデ
スケーリング水を継続して噴射し、これに続いて圧延機
群にて板厚が3mmになる熱間圧延を施した。
[Examples] A low carbon steel slab having a thickness of 260 mm and a width of 1200 mm was roughly rolled into a sheet bar having a thickness of 30 mm and a width of 1200 mm, and then the trailing end portion of a preceding sheet bar and a trailing sheet bar were cut by a cutting device. The front end of the sheet bar is cut into a shape such that the ends in the width direction come into contact with each other in the abutted state, and then both ends in the width direction of the sheet bar are pre-bonded (bonding margin) with a heating and bonding device composed of an alternating magnetic field generator. : 200 mm, gap size: 20 mm), and pressure 150 kgf / cm 2 , flow rate per unit width using a descaling header that moves in synchronization with the conveyance of the sheet bar until it reaches the finishing mill. Descaling water was continuously sprayed on the unbonded surface of the gap under the condition of 30 l / sec / m, and then hot rolling was performed by a rolling mill group to a plate thickness of 3 mm.

【0020】上記の圧延の結果、予接合してから単にス
ケールブレーカーを通過せさて圧延を行った場合におい
ては板幅中央部の接合不良に起因した破断が20%の割合
で発生していたものが皆無となり、安定した圧延が可能
であることが確かめられた。
As a result of the above rolling, when pre-bonding and then simply passing through a scale breaker for rolling, 20% of fractures were caused due to poor bonding in the central portion of the sheet width. However, it was confirmed that stable rolling was possible.

【0021】[0021]

【発明の効果】この発明によれば、鋼片の予接合の際に
形成されるギャップの未接合面でのスケールの生成を極
めて小さくできるので、板幅方向全域にわたる接合の下
に熱間仕上げ圧延を安定して実施することが可能で、生
産性の向上を図ることができる。
EFFECTS OF THE INVENTION According to the present invention, the generation of scale on the unbonded surface of the gap formed during the pre-bonding of steel slabs can be made extremely small. Rolling can be performed stably, and productivity can be improved.

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

【図1】この発明の実施に用いて好適な設備の構成を示
した図である。
FIG. 1 is a diagram showing a configuration of equipment suitable for implementing the present invention.

【図2】鋼片の接合状況を示した図である。FIG. 2 is a diagram showing a joining state of steel pieces.

【図3】鋼片の接合状況を示した図である。FIG. 3 is a diagram showing a joining state of steel pieces.

【図4】デスケーリング水の噴射状況を示した図であ
る。
FIG. 4 is a diagram showing an injection situation of descaling water.

【符号の説明】[Explanation of symbols]

1 先行鋼片 2 後行鋼片 3 加熱接合装置 4 デスケーリングヘッダー 5 仕上げ圧延機群 1 Leading billet 2 Trailing billet 3 Heating and joining device 4 Descaling header 5 Finishing and rolling mill group

───────────────────────────────────────────────────── フロントページの続き (72)発明者 竹林 克浩 千葉県千葉市中央区川崎町1番地 川崎製 鉄株式会社技術研究本部内 (72)発明者 藤井 雄作 千葉県千葉市中央区川崎町1番地 川崎製 鉄株式会社技術研究本部内 (72)発明者 武智 敏貞 千葉県千葉市中央区川崎町1番地 川崎製 鉄株式会社千葉製鉄所内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Katsuhiro Takebayashi 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Corporation Technical Research Headquarters (72) Inventor Yusaku Fujii 1 Kawasaki-cho, Chuo-ku, Chiba (72) Inventor Tosada Takechi, 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Co., Ltd. Chiba Works

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 先行する鋼片の後端部およびこれに引き
続く後続の鋼片の先端部のそれぞれに切断加工を施し、
次いで各鋼片をその幅方向の少なくとも両端部にて接合
した後に、仕上げ圧延機群に送給して連続的に熱間圧延
するに当たり、 接合処理を終えたのちの鋼片の搬送過程で、鋼片と同期
して移動するデスケーリングヘッダーにより鋼片相互間
に残存するギャップの未接合面に対して継続してデスケ
ーリング水を噴射することを特徴する鋼片の連続熱間圧
延方法。
1. A cutting process is applied to each of a trailing end portion of a preceding steel piece and a leading end portion of a succeeding steel piece subsequent thereto,
Next, after joining each steel slab at least at both ends in the width direction, when feeding the slabs to the finishing rolling mill group and continuously hot rolling, in the process of conveying the slabs after the joining process, A continuous hot rolling method for a steel strip, characterized in that a descaling header that moves in synchronization with the steel strip continuously injects descaling water to the unbonded surface of the gap remaining between the steel strips.
JP5584093A 1993-03-16 1993-03-16 Continuous hot rolling method for billet Pending JPH06262244A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5584093A JPH06262244A (en) 1993-03-16 1993-03-16 Continuous hot rolling method for billet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5584093A JPH06262244A (en) 1993-03-16 1993-03-16 Continuous hot rolling method for billet

Publications (1)

Publication Number Publication Date
JPH06262244A true JPH06262244A (en) 1994-09-20

Family

ID=13010204

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5584093A Pending JPH06262244A (en) 1993-03-16 1993-03-16 Continuous hot rolling method for billet

Country Status (1)

Country Link
JP (1) JPH06262244A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0832700A1 (en) * 1996-09-25 1998-04-01 DANIELI & C. OFFICINE MECCANICHE S.p.A. Method to weld billets leaving a furnace and a rolling line adopting the method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0832700A1 (en) * 1996-09-25 1998-04-01 DANIELI & C. OFFICINE MECCANICHE S.p.A. Method to weld billets leaving a furnace and a rolling line adopting the method
US5931370A (en) * 1996-09-25 1999-08-03 Danieli & C. Officine Meccaniche Spa Method to weld billets leaving a furnace and a rolling line adopting the method

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