JPH0890047A - Production of controlled cooling steel plate - Google Patents

Production of controlled cooling steel plate

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Publication number
JPH0890047A
JPH0890047A JP22156394A JP22156394A JPH0890047A JP H0890047 A JPH0890047 A JP H0890047A JP 22156394 A JP22156394 A JP 22156394A JP 22156394 A JP22156394 A JP 22156394A JP H0890047 A JPH0890047 A JP H0890047A
Authority
JP
Japan
Prior art keywords
rolling
descaling
controlled cooling
pressure water
steel sheet
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
JP22156394A
Other languages
Japanese (ja)
Other versions
JP3235698B2 (en
Inventor
Kenichi Oe
憲一 大江
Atsushi Miyawaki
淳 宮脇
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.)
Kobe Steel Ltd
Original Assignee
Kobe Steel 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 Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP22156394A priority Critical patent/JP3235698B2/en
Publication of JPH0890047A publication Critical patent/JPH0890047A/en
Application granted granted Critical
Publication of JP3235698B2 publication Critical patent/JP3235698B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PURPOSE: To eliminate cooling irregularity at peripheries in a controlled cooling steel plate. CONSTITUTION: When a controlled cooling steel plate is produced by the hot rolling line which has a high pressure water descaling device between heating furnace and finish rolling mill, an edge rolling mill between heating furnace and roughing mill and a controlled cooling device backward finish rolling mill, the slab extracted from heating furnace is, before start of rolling, subjected to one or more times descaling at least with use of a high pressure water descaling device by high pressure water of >=3.0MPa collision pressure. Further, in rough rolling process after edge rolling, descaling of one or more times at least is executed with high pressure water of >=3.0MPa collision pressure, or in finish rolling process, descaling of one or more times at least including descaling, before finish rolling start, is executed with high pressure water of >=3.0MPa collision pressure and then hot rolling is executed, after completing hot rolling, controlled cooling is executed with use of the controlled cooling device.

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、制御冷却鋼板の製造工
程において、制御冷却停止時の鋼板表面の温度偏差(冷
却むら)を、特に、鋼板の先端部や幅方向端部に発生す
る冷却むらを防止する制御冷却鋼板の製造方法に関する
ものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling process for producing a controlled cooling steel sheet, in which a temperature deviation (cooling unevenness) on the surface of the steel sheet when the controlled cooling is stopped is generated particularly at the leading end or the widthwise end of the steel sheet. The present invention relates to a method for manufacturing a controlled cooling steel plate that prevents unevenness.

【0002】[0002]

【従来の技術】制御冷却鋼板の製造過程では、熱間圧延
に引き続くオンライン制御冷却において、冷却停止時の
温度偏差による冷却むらが鋼板表面に発生することがあ
る。この冷却むらの発生原因の一つは、スケール厚の不
均一によることが、材料とプロセスVol.4(1991-1563)に
報告されている。
2. Description of the Related Art In the process of manufacturing a controlled cooling steel sheet, unevenness of cooling may occur on the surface of the steel sheet due to temperature deviation when cooling is stopped in the online controlled cooling subsequent to hot rolling. It is reported in Material and Process Vol.4 (1991-1563) that one of the causes of this uneven cooling is due to non-uniform scale thickness.

【0003】従来、スケール疵防止等のスケールに起因
した課題を解決する手段として、例えば、デスケーリン
グ時の鋼板温度を限定するとともに、デスケーリングの
ポンプ吐出圧を高圧化してスケールの剥離性を改善する
方法などが提案されている。
Conventionally, as means for solving problems caused by scales such as prevention of scale defects, for example, the steel plate temperature at the time of descaling is limited, and the pump discharge pressure for descaling is increased to improve the peelability of the scale. The method of doing is proposed.

【0004】[0004]

【発明が解決しようとする課題】しかしながら、これら
の方法によっても、加熱中、地鉄界面に生成している一
次スケール層は完全に除去できていないのが現状であ
る。たとえ熱間圧延中のデスケーリングでこのスケール
層が除去できたとしても、その後の圧延過程で二次スケ
ールが生成する。これらの加熱中や圧延中に生成したス
ケールが鋼板表面のスケール厚の不均一さの原因となっ
ており、そのため、制御冷却停止後の鋼板表面の温度偏
差は大きくなり、いわゆる冷却むらが発生する。
However, even with these methods, the current situation is that the primary scale layer formed at the interface of the base metal cannot be completely removed even by these methods. Even if this scale layer can be removed by descaling during hot rolling, secondary scale is generated in the subsequent rolling process. These scales generated during heating and rolling cause non-uniformity of the scale thickness of the steel sheet surface.Therefore, the temperature deviation of the steel sheet surface after the controlled cooling stop becomes large, and so-called cooling unevenness occurs. .

【0005】このような冷却むらが鋼板の長手方向先後
端部や幅方向端部に発生すると、この部分は強度不合格
となり、これによる冷却むら発生部の切り捨て量が増大
して歩留りが低下し、あるいは形状不良などの問題が発
生してくる。
When such cooling unevenness occurs at the front and rear ends of the steel sheet in the longitudinal direction and the end in the width direction, this portion becomes unacceptable for strength, and the cut-off amount of the cooling unevenness-caused portion due to this increases and the yield decreases. Or, a problem such as a defective shape occurs.

【0006】本発明は、上記の問題点を解決するために
なされたもので、熱間圧延工程で高圧水デスケーリング
装置を用いて鋼板表面のスケール厚を均一にすることに
よって、制御冷却鋼板に発生する冷却むらを防止する制
御冷却鋼板の製造方法であり、特に、鋼板の四周部に発
生する冷却むらを防止する制御冷却鋼板の製造方法を提
供することを目的とする。
The present invention has been made in order to solve the above-mentioned problems, and in a hot rolling process, a high-pressure water descaling device is used to make the scale thickness of the steel sheet surface uniform, thereby providing a controlled cooling steel sheet. It is an object of the present invention to provide a method for producing a controlled cooling steel sheet for preventing the occurrence of cooling unevenness, and particularly to provide a method for producing a controlled cooling steel sheet for preventing the occurrence of cooling unevenness at the four peripheral portions of the steel sheet.

【0007】[0007]

【課題を解決するための手段】本発明の要旨は、加熱炉
と粗圧延機間、および粗圧延機と仕上圧延機間に高圧水
デスケーリング装置を有し、さらに加熱炉と粗圧延機間
にエッジング圧延機を、仕上圧延機後方に制御冷却装置
を有する熱間圧延ラインで制御冷却鋼板を製造するに際
し、加熱炉から抽出した鋼片を、圧延開始前に前記高圧
水デスケーリング装置を用いて衝突圧が3.0MPa以上の高
圧水で少なくとも1回以上のデスケーリングを行い、さ
らにエッジング圧延以降の粗圧延工程で衝突圧が3.0MPa
以上の高圧水で少なくとも1回以上のデスケーリングを
行うか、または、仕上圧延工程で衝突圧が3.0MPa以上の
高圧水で仕上圧延開始前のデスケーリングを含めて少な
くとも1回以上のデスケーリングを行って熱間圧延し、
熱間圧延終了後、前記制御冷却装置を用いて制御冷却す
る制御冷却鋼板の製造方法である。
The gist of the present invention is to have a high-pressure water descaling device between the heating furnace and the rough rolling mill, and between the rough rolling mill and the finishing rolling mill, and further between the heating furnace and the rough rolling mill. In producing a controlled cooling steel plate in a hot rolling line having a controlled cooling device at the rear of the finishing rolling mill, a steel strip extracted from a heating furnace is used with the high-pressure water descaling device before starting rolling. Descaling is performed at least once with high-pressure water with a collision pressure of 3.0 MPa or more, and the collision pressure is 3.0 MPa in the rough rolling process after edging rolling.
At least one descaling with the above high pressure water or at least one descaling including the descaling before the start of finishing rolling with the high pressure water with a collision pressure of 3.0 MPa or more in the finishing rolling process. Go hot rolling
It is a method for producing a controlled cooling steel sheet, in which controlled cooling is performed using the controlled cooling device after hot rolling is completed.

【0008】[0008]

【作用】以下に、本発明について詳細に説明する。鋼板
の四周部に発生する冷却むらの一例を図2に示す。図2
に示すように、鋼板の長手方向端部から約50mmから 300
mmの領域と鋼板幅端部から約20mmから 100mmの領域の冷
却停止後の温度が高くなっている。このときの温度は、
鋼板表面中央部が 440〜460 ℃に対して四周部は 450〜
520 ℃で、四周部が中央部より10〜80℃高くなってい
る。このように四周部の冷却停止後の温度が高くなる
と、この部分は強度不足になり不合格となる。この現象
について、種々の検討を重ねた結果、鋼板の四周部に発
生する冷却むらは、熱間圧延工程におけるエッジング圧
延が原因であることを突き止めた。
The present invention will be described in detail below. FIG. 2 shows an example of the cooling unevenness generated on the four peripheral portions of the steel sheet. Figure 2
50mm to 300mm from the longitudinal edge of the steel plate as shown in
The temperature after cooling stop is high in the area of mm and the area of about 20 mm to 100 mm from the edge of the steel plate width. The temperature at this time is
The center of the steel plate surface is 440 to 460 ℃, while the four edges are 450 to 460 ℃
At 520 ℃, the circumference is 10 to 80 ℃ higher than the center. When the temperature of the four peripheral portions after cooling is increased in this way, this portion becomes insufficient in strength and is rejected. As a result of various studies on this phenomenon, it was found that the cooling unevenness occurring in the four peripheral portions of the steel sheet was caused by the edging rolling in the hot rolling process.

【0009】図3に従来の熱間圧延工程の一例を示す。
加熱された鋼片は加熱炉から抽出され、ついでデスケー
リング装置(Hydraulic Scale Breaker )で一次スケー
ルが除去され、粗圧延機、仕上圧延機で順次圧延され鋼
板に仕上げられる。この間、粗圧延機、仕上圧延機では
圧延機前後面のデスケーラーで二次スケールが除去され
る。また、鋼板の寸法、形状を整えるために、熱間圧延
ではエッジング圧延機(竪型圧延機)を少なくとも1回
以上使用する。圧延が終了した鋼板は制御冷却装置で制
御冷却され機械的性質の改善が行われる。
FIG. 3 shows an example of a conventional hot rolling process.
The heated steel slab is extracted from the heating furnace, the primary scale is removed by a descaling device (Hydraulic Scale Breaker), and the steel sheet is sequentially rolled by a rough rolling mill and a finish rolling mill to finish a steel sheet. During this period, in the rough rolling mill and the finishing rolling mill, the secondary scales are removed by the descalers on the front and rear surfaces of the rolling mill. Further, in order to adjust the size and shape of the steel sheet, an edging rolling mill (vertical rolling mill) is used at least once in hot rolling. The rolled steel sheet is controlled and cooled by a controlled cooling device to improve its mechanical properties.

【0010】図4は熱間圧延工程でエッジング圧延機を
使用する場合の説明図で、図4では鋼片を90°回転させ
てエッジング工程でエッジング圧延機を通して鋼板のト
ップ(T) 、ボトム(B) の形状を整え、その後、粗圧延機
で幅出し圧延して、最終鋼板の幅寸法を確保する。その
後、90°回転させて再度エッジング圧延機を通して鋼板
のサイドの形状を整え、粗圧延、仕上圧延の順に圧延を
行う。この間、最初にエッジング圧延機を通した時点で
鋼板トップ、ボトムのスケールが剥離し、つぎにエッジ
ング圧延機を通した時点で鋼板サイドのスケールが剥離
する。このように、エッジング圧延機を通すと鋼板の四
周部には、鋼板の他の部分よりもスケール層の薄い部分
が生じる。
FIG. 4 is an explanatory view when an edging rolling mill is used in the hot rolling process. In FIG. 4, the steel slab is rotated 90 ° and the edging rolling mill is used in the edging process to pass the top (T) and bottom () of the steel sheet. Align the shape of B), and then tenter rolling with a rough rolling mill to secure the width dimension of the final steel plate. After that, the steel sheet is rotated 90 °, passed through an edging rolling machine again to adjust the shape of the side of the steel sheet, and then rolled in the order of rough rolling and finish rolling. During this period, the scales on the top and bottom of the steel sheet are peeled off when the steel sheet is first passed through the edging rolling machine, and the scales on the steel sheet side are peeled off when the steel sheet is passed through the edging rolling machine. As described above, when the steel sheet is passed through the edging rolling mill, a portion where the scale layer is thinner than other portions of the steel sheet is formed on the four peripheral portions of the steel sheet.

【0011】エッジング圧延時には、鋼板端部から20〜
30mm入ったところから数十mm〜百数十mmの領域にかけて
スケールが剥離する。これは鋼片加熱時に生成したスケ
ールが抽出後のデスケーリングにより完全に除去されず
に残存していた地鉄界面の一次スケール、あるいは、そ
のスケールが完全に除去されたとしても、その後の熱間
圧延過程で生成した二次スケールがエッジング圧延時に
局所的に剥離したものである。このため、この状態で圧
延を仕上圧延まで行うと鋼板表面のスケール厚が不均一
となり、その後の制御冷却で冷却むらが発生する。
During edging rolling, 20 to 20
The scale peels off from the area of 30 mm to several tens of mm to several hundreds of tens of mm. This is due to the fact that the scale produced during the heating of the billet remains without being completely removed by descaling after extraction, or even if the scale is completely removed, the subsequent hot work The secondary scale generated in the rolling process is locally peeled during the edging rolling. Therefore, if rolling is performed up to finish rolling in this state, the scale thickness on the surface of the steel sheet becomes non-uniform, and uneven cooling occurs in the subsequent controlled cooling.

【0012】1150℃に加熱した鋼片から圧延した冷却む
らの発生した鋼板についてスケール厚さを調査した。そ
の結果、冷却停止後の温度の高い端部では、鋼板幅端部
から40mm位置のスケール厚さが 8〜12μm であるのに対
し、冷却停止後の温度の低い鋼板幅方向中央部のそれは
20〜35μm であった。この時の温度偏差は約60℃であっ
た。
[0012] Scale thickness was investigated for a steel sheet rolled from a billet heated to 1150 ° C and having uneven cooling. As a result, at the high temperature end after cooling stop, the scale thickness at the 40 mm position from the steel plate width end is 8 to 12 μm, while that at the cold steel plate width center after cooling stop is
It was 20 to 35 μm. The temperature deviation at this time was about 60 ° C.

【0013】材料とプロセスVol.4(1991-1563)に報告さ
れているように、鋼板表面にスケール厚の不均一がある
と、スケール厚の増大にともなう冷却促進効果により冷
却速度が異なり冷却むらが発生していまう。したがっ
て、本発明は鋼板表面のスケール厚を均一にして、制御
冷却鋼板の冷却むら発生を防止するものである。
As reported in Materials and Processes Vol. 4 (1991-1563), if the scale thickness of the steel sheet surface is non-uniform, the cooling rate will be different due to the cooling acceleration effect with the increase of the scale thickness, resulting in uneven cooling. Is happening. Therefore, the present invention makes the scale thickness of the steel plate surface uniform and prevents the occurrence of uneven cooling of the controlled cooling steel plate.

【0014】本発明では、加熱炉から抽出した鋼片表面
の一次スケールを除去するために、圧延開始前に高圧水
デスケーリング装置を用いて衝突圧が3.0MPa以上の高圧
水で少なくとも1回以上のデスケーリングを行う。高圧
水の衝突圧を3.0MPa以上にした理由は、図1に示すよう
に、高圧水の衝突圧が3.0MPa以上であれば、加熱温度が
1000℃から1230℃までの鋼片表面の一次スケールはほと
んど除去できるからである。
In the present invention, in order to remove the primary scale on the surface of the billet extracted from the heating furnace, a high-pressure water descaling device is used before the start of rolling, and at least once with high-pressure water having a collision pressure of 3.0 MPa or more. Descaling of. As shown in Fig. 1, the reason why the collision pressure of the high-pressure water is set to 3.0 MPa or more is that if the collision pressure of the high-pressure water is 3.0 MPa or more, the heating temperature is
This is because most of the primary scale on the surface of the billet from 1000 ℃ to 1230 ℃ can be removed.

【0015】さらにエッジング圧延で四周部のスケール
が剥離した部分とそうでない部分のスケール厚の不均一
をなくすために、エッジング圧延以降の粗圧延工程で衝
突圧が3.0MPa以上の高圧水で少なくとも1回以上のデス
ケーリングを行うか、または、仕上圧延工程で衝突圧が
3.0MPa以上の高圧水で仕上圧延開始前のデスケーリング
を含めて少なくとも1回以上のデスケーリングを行う。
このように、エッジング圧延後に衝突圧が3.0MPa以上の
高圧水でデスケーリングすることによって、残存一次ス
ケールおよび熱間圧延中に生成した二次スケールは除去
され、これ以降の圧延中に生成する鋼板表面の二次スケ
ール厚は均一となり、その後の制御冷却において冷却む
らが発生することはなくなる。
Further, in order to eliminate the unevenness of the scale thickness in the part where the scale is separated and the part where the scale is not present in the four circumferences in the edging rolling, in the rough rolling step after the edging rolling, the impact pressure is at least 1 with high pressure water of 3.0 MPa or more. Descaling more than one time, or collision pressure during finish rolling process
Descaling is performed at least once with high-pressure water of 3.0 MPa or more, including descaling before the start of finish rolling.
In this way, after the edging rolling, the collision pressure is descaled with high-pressure water of 3.0 MPa or more, the residual primary scale and the secondary scale produced during hot rolling are removed, and the steel sheet produced during the subsequent rolling. The secondary scale thickness on the surface becomes uniform, and uneven cooling does not occur in the subsequent controlled cooling.

【0016】以上のように、デスケーリングして熱間圧
延することによって、鋼板表面のスケール厚は均一にな
り、その後の制御冷却装置を用いる制御冷却において冷
却むらが発生するこはない。
As described above, by descaling and hot rolling, the scale thickness on the surface of the steel sheet becomes uniform, and uneven cooling does not occur in the subsequent controlled cooling using the controlled cooling device.

【0017】[0017]

【実施例】以下に、本発明の実施例について説明する。
1150℃で大気雰囲気中で加熱した鋼片を、加熱炉から抽
出後、表1に示す条件でデスケーリングを行い、1パス
の粗圧延を行った後、エッジング量20mmのエッジング圧
延を行った。エッジング圧延を行った後は、表1に示す
条件でデスケーリングを行い粗圧延、仕上圧延の順に熱
間圧延を行い板厚22mmの鋼板に仕上げた。熱間圧延終了
後は制御冷却装置で 870℃から 450℃まで制御冷却を行
った。冷却停止後、赤外線放射温度計で鋼板中央部と四
周部の温度を測定した。中央部と四周部の温度差を表1
に示す。
EXAMPLES Examples of the present invention will be described below.
A steel slab heated at 1150 ° C. in an air atmosphere was extracted from the heating furnace, descaled under the conditions shown in Table 1, rough-rolled for one pass, and then edging-rolled with an edging amount of 20 mm. After the edging rolling, descaling was performed under the conditions shown in Table 1 and hot rolling was performed in the order of rough rolling and finish rolling to finish a steel sheet having a thickness of 22 mm. After completion of hot rolling, controlled cooling was performed from 870 ° C to 450 ° C with a controlled cooling device. After the cooling was stopped, the temperatures of the central portion of the steel plate and the four peripheral portions were measured with an infrared radiation thermometer. Table 1 shows the temperature difference between the central part and the four peripheral parts.
Shown in

【0018】[0018]

【表1】 [Table 1]

【0019】表1に示すように、本発明例のNo.4は、鋼
片抽出後衝突圧が3.0MPaの高圧水デスケーリングを1回
行い一次スケールを除去したのち、エッジング圧延後に
同様なデスケーリングを1回行っている。No.5、6 は、
鋼片抽出後にデスケーリングを1回行った後、仕上圧延
開始前にデスケーリングを1回行い、さらにNo.6は、仕
上圧延中にデスケーリングを2回行っている。このよう
に、エッジング圧延後の熱間圧延過程で、衝突圧が3.0M
Pa以上の高圧水デスケーリングを行うことによって、エ
ッジング圧延時のスケール剥離に起因する鋼板表面のス
ケール厚の不均一はなくなる。したがって、制御冷却に
よる冷却むらが発生せず、鋼板中央部と四周部の温度差
は 0℃から10℃と極めて小さい。
As shown in Table 1, in No. 4 of the present invention, after extracting the billet, high pressure water descaling with a collision pressure of 3.0 MPa was performed once to remove the primary scale, and then the same descaling was performed after edging rolling. Scaling is done once. No.5 and 6 are
After descaling once after extracting the billet, descaling was performed once before the start of finish rolling, and in No. 6, descaling was performed twice during finish rolling. Thus, in the hot rolling process after edging rolling, the collision pressure is 3.0M.
By performing high-pressure water descaling of Pa or more, non-uniformity of the scale thickness on the steel sheet surface due to scale peeling during edging rolling is eliminated. Therefore, uneven cooling due to controlled cooling does not occur, and the temperature difference between the central portion of the steel sheet and the four peripheral portions is extremely small, 0 ° C to 10 ° C.

【0020】他方、比較例のNo.1、2 は、本発明例と同
様に鋼片抽出後と、エッジング圧延後または仕上圧延開
始前にデスケーリングを1回行っているが、衝突圧が0.
8MPaと小さいため、鋼板表面のスケール厚は均一になら
ず冷却むらが発生し、鋼板中央部と四周部の温度差は43
℃と62℃で大きい。また、No.3は、鋼片抽出後は衝突圧
が3.0MPaの高圧水デスケーリングを1回行い一次スケー
ルを除去しているが、エッジング圧延後のデスケーリン
グの衝突圧が0.8MPaと小さいため、二次スケールが除去
されず、鋼板表面のスケール厚は均一にならず冷却むら
が発生し、鋼板中央部と四周部の温度差は38℃と大き
い。
On the other hand, in Comparative Examples Nos. 1 and 2, descaling was performed once after the billet extraction and after the edging rolling or before the start of the finish rolling as in the case of the present invention, but the collision pressure was 0. .
Since it is as small as 8 MPa, the scale thickness on the surface of the steel sheet is not uniform and uneven cooling occurs, and the temperature difference between the central portion of the steel sheet and the four peripheral portions is 43
Great at ℃ and 62 ℃. In No. 3, the high-pressure water descaling with a collision pressure of 3.0 MPa was performed once after the steel billet was extracted to remove the primary scale, but the descaling collision pressure after edging rolling was as low as 0.8 MPa. The secondary scale was not removed, the scale thickness of the steel sheet surface was not uniform, and uneven cooling occurred, and the temperature difference between the central portion of the steel sheet and the four peripheral portions was as large as 38 ° C.

【0021】[0021]

【発明の効果】以上述べたところから明らかなように、
本発明によれば、制御冷却鋼板の四周部に発生する冷却
むらが防止でき、このため、冷却むらによる強度不足が
なくなり歩留りが向上し、形状不良もなくなる。
As is apparent from the above description,
According to the present invention, it is possible to prevent uneven cooling from occurring in the four peripheral portions of the controlled cooling steel sheet, so that insufficient strength due to uneven cooling is eliminated, yield is improved, and defective shapes are eliminated.

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

【図1】一次スケールの除去に及ぼす高圧水の衝突圧の
影響を示す図である。
FIG. 1 is a diagram showing the effect of high-pressure water collision pressure on the removal of primary scale.

【図2】鋼板四周部に発生した冷却むらの一例を示す図
である。
FIG. 2 is a diagram showing an example of cooling unevenness generated on the four peripheral portions of a steel plate.

【図3】従来の熱間圧延工程の一例を示す図である。FIG. 3 is a diagram showing an example of a conventional hot rolling process.

【図4】熱間圧延工程でエッジャーを使用する場合の説
明図である。
FIG. 4 is an explanatory diagram when an edger is used in a hot rolling process.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 加熱炉と粗圧延機間、および粗圧延機と
仕上圧延機間に高圧水デスケーリング装置を有し、さら
に加熱炉と粗圧延機間にエッジング圧延機を、仕上圧延
機後方に制御冷却装置を有する熱間圧延ラインで制御冷
却鋼板を製造するに際し、加熱炉から抽出した鋼片を、
圧延開始前に前記高圧水デスケーリング装置を用いて衝
突圧が3.0MPa以上の高圧水で少なくとも1回以上のデス
ケーリングを行い、さらにエッジング圧延以降の粗圧延
工程で衝突圧が3.0MPa以上の高圧水で少なくとも1回以
上のデスケーリングを行うか、または、仕上圧延工程で
衝突圧が3.0MPa以上の高圧水で仕上圧延開始前のデスケ
ーリングを含めて少なくとも1回以上のデスケーリング
を行って熱間圧延し、熱間圧延終了後、前記制御冷却装
置を用いて制御冷却することを特徴とする制御冷却鋼板
の製造方法。
1. A high-pressure water descaling device is provided between the heating furnace and the rough rolling mill, and between the rough rolling mill and the finishing rolling mill, and an edging rolling mill is further provided between the heating furnace and the rough rolling mill, and the rear of the finishing rolling mill is provided. In producing a controlled cooling steel plate in a hot rolling line having a controlled cooling device, the steel billet extracted from the heating furnace is
Before rolling, the high-pressure water descaling device is used to perform descaling with high-pressure water having a collision pressure of 3.0 MPa or more at least once, and in the rough rolling process after edging rolling, the collision pressure is 3.0 MPa or more. Descaling with water at least once or using high-pressure water with a collision pressure of 3.0 MPa or more in the finishing rolling process to perform descaling at least once including the descaling before the start of finishing rolling. A method for producing a controlled cooling steel sheet, which comprises performing hot rolling and performing controlled cooling using the controlled cooling device after completion of hot rolling.
JP22156394A 1994-09-16 1994-09-16 Manufacturing method of controlled cooling steel sheet Expired - Fee Related JP3235698B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22156394A JP3235698B2 (en) 1994-09-16 1994-09-16 Manufacturing method of controlled cooling steel sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22156394A JP3235698B2 (en) 1994-09-16 1994-09-16 Manufacturing method of controlled cooling steel sheet

Publications (2)

Publication Number Publication Date
JPH0890047A true JPH0890047A (en) 1996-04-09
JP3235698B2 JP3235698B2 (en) 2001-12-04

Family

ID=16768696

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22156394A Expired - Fee Related JP3235698B2 (en) 1994-09-16 1994-09-16 Manufacturing method of controlled cooling steel sheet

Country Status (1)

Country Link
JP (1) JP3235698B2 (en)

Also Published As

Publication number Publication date
JP3235698B2 (en) 2001-12-04

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