JPH03128122A - Accelerated cooling method of thick steel plate - Google Patents
Accelerated cooling method of thick steel plateInfo
- Publication number
- JPH03128122A JPH03128122A JP26546289A JP26546289A JPH03128122A JP H03128122 A JPH03128122 A JP H03128122A JP 26546289 A JP26546289 A JP 26546289A JP 26546289 A JP26546289 A JP 26546289A JP H03128122 A JPH03128122 A JP H03128122A
- Authority
- JP
- Japan
- Prior art keywords
- cooling
- leveler
- roller leveler
- leveling
- accelerated cooling
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
- B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0071—Levelling the rolled product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices 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
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Straightening Metal Sheet-Like Bodies (AREA)
Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
本発明は、厚鋼板の製造過程における仕上圧延後の厚鋼
板の加速冷却方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method for accelerated cooling of a thick steel plate after finish rolling in the manufacturing process of the steel plate.
（ロ）従来技術
従来の厚鋼板の製造過程の加速冷却方法においては、仕
上圧延後の厚鋼板をまず加速冷却装置で冷却し、次いで
ホットレベラによって形状矯正を行うか、または、先に
ホットレベラで形状矯正を行った後に加速冷却を行って
いた。(B) Prior Art In the conventional accelerated cooling method in the manufacturing process of thick steel plates, the thick steel plate after finish rolling is first cooled in an accelerated cooling device, and then the shape is corrected by a hot leveler, or the shape is first corrected by a hot leveler. Accelerated cooling was performed after straightening.
形状矯正を行う前に加速冷却を行うと、圧延形状（不良
形状）のまま冷却に入るので均一冷却が得られにくい、
その結果、形状矯正、空冷後に形状不良が再び現れる。If accelerated cooling is performed before shape correction, the rolled shape (defective shape) will enter cooling, making it difficult to obtain uniform cooling.
As a result, the defective shape reappears after shape correction and air cooling.
加速冷却前に形状矯正を行うと、冷却の均一性は得られ
るが、冷却後に発生した平坦不良は矯正不可能であるや
また、圧延直後の冷却ができないので、鋼板の機械的性
質も得にくい。If shape correction is performed before accelerated cooling, uniformity of cooling can be obtained, but it is impossible to correct flatness defects that occur after cooling, and it is also difficult to obtain mechanical properties of the steel sheet because cooling cannot be performed immediately after rolling. .
特開昭５４−１２４８６４号公報では、鋼板の直接焼入
れ方法を開示している。しかし、この方法は鋼板の冷却
後の復熱を考慮せずに冷却直後にレベリングを実施して
いる。JP-A-54-124864 discloses a method for directly hardening a steel plate. However, this method performs leveling immediately after cooling, without taking into account heat recovery after cooling the steel plate.
現在主流となっている加速冷却は、冷却停止温度が４０
０〜６００℃程度であり、鋼板の結晶粒径を微細にする
技術であり、焼入れ技術とは異なる。The current mainstream accelerated cooling has a cooling stop temperature of 40
The temperature is about 0 to 600°C, and it is a technique for making the crystal grain size of a steel plate finer, and is different from a quenching technique.
（ハ〉発明が解決しようとする課題
本発明が解決しようとする課題は、厚鋼板の製造過程に
おいて、加速冷却前後の工程を改善して、形状・平坦度
のよい加速冷却材を得ることにある。(c) Problem to be solved by the invention The problem to be solved by the invention is to improve the processes before and after accelerated cooling in the manufacturing process of thick steel plates, and to obtain an accelerated cooling material with good shape and flatness. be.
（ニ）課題を解決するための手段
本発明の厚鋼板の加速冷却方法は。リバース圧延機の出
側に、上部レベラロールを昇降移動できる第１ローラレ
ベラを配置し、該第１ローラレベラの出側直近に冷却装
置を設け、該冷却装置の出側に所定の間隔をあけて第２
ローラレベラを設けること、圧延材のリバース圧延中は
前記第１ローラレベラの上部レベラロールを上昇させて
おくこと、該リバース圧延完了直後の圧延材を前記第１
ローラレベラに誘導してレベリングを行うこと、該レベ
リング後の圧延材を前記冷却装置に導入して加速冷却を
行うこと、加速冷却後復熱した圧延材を前記第２ローラ
レベラに誘導してレベリングを行うことからなる手段に
よって、上記課題を解決している。(d) Means for Solving the Problems The method for accelerated cooling of thick steel plates of the present invention is as follows. A first roller leveler that can move the upper leveler roll up and down is arranged on the exit side of the reverse rolling mill, a cooling device is provided immediately on the exit side of the first roller leveler, and a second roller leveler is installed at a predetermined interval on the exit side of the cooling device.
a roller leveler is provided, an upper leveler roll of the first roller leveler is raised during reverse rolling of the rolled material, and the rolled material immediately after the completion of the reverse rolling is
Leveling is performed by guiding the rolled material to a roller leveler; introducing the rolled material after leveling into the cooling device to perform accelerated cooling; and guiding the reheated rolled material after accelerated cooling to the second roller leveler to perform leveling. The above problem is solved by the following means.
（ホ〉作 用
本発明の方法においては、まず、圧延機の直後に−Ｌ部
レしラロールの昇降可能な第１ローラレベラを設置する
。圧延中は上部レベラロールが上昇しており、厚鋼板と
の干渉を防いでいる。仕上圧延完了直前に、上部レベラ
ロールが所定の位置に下降して来て、圧延で発生してい
る厚鋼板の反り、大波といった、大きな形状不良を矯正
する。その結果、冷却の均一性が向上する。(E) Function In the method of the present invention, first, a first roller leveler is installed immediately after the rolling mill, and the -L section leveler roll can be raised and lowered.During rolling, the upper leveler roll is raised, and the thick steel plate and Immediately before finish rolling is completed, the upper leveler roll descends to a predetermined position and corrects large shape defects such as warpage and large waves in the thick steel plate that occur during rolling.As a result, Improved uniformity of cooling.
次いで、加速冷却を行う。この加速冷却は、７００〜８
００℃で仕−Ｅげた厚鋼板を４００〜６００℃まで、水
冷し、通常の空冷で主伐する結晶粒径よりも、より細か
な粒径にして同一成分でも強度と靭性の高い鋼板をつく
る。冷却速度は、板厚に応じて変化するが、平均すると
、板厚２０ｘｚで１０°Ｃ／秒、板厚３０ｚｚで７℃／
秒程度である。Then, accelerated cooling is performed. This accelerated cooling is 700 to 8
A thick steel plate processed at 00°C is water-cooled to 400-600°C, and the grain size is made finer than that obtained by main cutting by ordinary air cooling, and a steel plate with high strength and toughness is produced even with the same composition. The cooling rate varies depending on the plate thickness, but on average, it is 10°C/sec for a plate thickness of 20xz and 7°C/sec for a plate thickness of 30zz.
It is about seconds.
加速冷却の完了後、厚鋼板が復熱してかち、別の第２ロ
ーラレベラで再びレベリングを行い、厚鋼板の平坦矯正
を行う。After the accelerated cooling is completed, the thick steel plate is reheated and then leveled again using another second roller leveler to flatten the thick steel plate.
本発明の方法においては、圧延完了後にレベリング（矯
正）を行う、圧延完了後の厚鋼板の形状は、通常、反り
とか波が発生しており、そのまま冷却装置に入ると冷却
の不均一が起る。例えば、厚鋼板の先が上がった部分は
水のかかり方が平坦部分と異なり冷却不良になる。した
がって、冷却前には板を平坦にしておく必要がある。In the method of the present invention, leveling (straightening) is performed after rolling is completed.The shape of the thick steel plate after rolling usually has warps or waves, and if it enters the cooling device as it is, uneven cooling will occur. Ru. For example, a portion of a thick steel plate with an elevated tip receives water differently than a flat portion, resulting in poor cooling. Therefore, it is necessary to flatten the plate before cooling.
レベリング直後に加速冷却を行う。圧延後、しばらくし
た後に冷却を実施すると、その間に厚鋼板の結晶粒径が
粗大化し、強度靭性が下がる。したがって、なるべく圧
延直後に冷却を開始するのが望ましい。Accelerated cooling is performed immediately after leveling. If cooling is performed after a while after rolling, the grain size of the thick steel plate will become coarser during that time, and the strength and toughness will decrease. Therefore, it is desirable to start cooling immediately after rolling.
冷却後復熱の時間を設ける。冷却直後は表面温度と板幅
中心温度との差があるため、この温度差が減少するまで
復熱させる必要がある。そこで、冷却完了後にしばらく
距離をおいた場所に第２ローラレベラを置き、復熱後に
レベリングを行う。Allow time for reheating after cooling. Immediately after cooling, there is a difference between the surface temperature and the center temperature of the plate width, so it is necessary to reheat until this temperature difference decreases. Therefore, a second roller leveler is placed at a location a short distance after cooling is completed, and leveling is performed after recuperation.
レベリング後、完全冷却（空冷）を行う。第２ローラレ
ベラで矯正を行った後、通常冷却床へ送る。After leveling, perform complete cooling (air cooling). After straightening with the second roller leveler, it is normally sent to a cooling bed.
従来までのような不均一冷却、レベリングでは、レベリ
ングによって一度は平坦になるものの、その後の空冷過
程で平坦度不良が生じる。本工程では、これを防止する
ことができる。In conventional non-uniform cooling and leveling, although the surface becomes flat once through leveling, poor flatness occurs during the subsequent air cooling process. In this step, this can be prevented.
（へ）実施例
本発明の厚鋼板の加速冷却方法の実施例について説明す
る。(f) Example An example of the method for accelerated cooling of thick steel plates according to the present invention will be described.
本発明の加速冷却方法は、第１図に示すように、リバー
ス圧延機１の出側に、上部レベラロール２１を昇降移動
できる第１ローラレベラ２を配置し、第１ローラレベラ
２の出側直近に冷却装置３を設け、冷却装置３の出側に
所定の間隔Ｓをあけて第２ローラレベラ４を設ける。In the accelerated cooling method of the present invention, as shown in FIG. 1, a first roller leveler 2 that can move an upper leveler roll 21 up and down is arranged on the exit side of a reverse rolling mill 1, and cooling is performed immediately adjacent to the exit side of the first roller leveler 2. A device 3 is provided, and a second roller leveler 4 is provided at a predetermined interval S on the exit side of the cooling device 3.
圧延材５のリバース圧延中は第１ローラレベラ２の上部
レベラロール２１を上昇させておく。リバース圧延完了
直後の圧延材５を第１ローラレベラ２に誘導してレベリ
ングを行う。レベリング後の圧延材５を冷却装置３に導
入して加速冷却を行う。During reverse rolling of the rolled material 5, the upper leveler roll 21 of the first roller leveler 2 is raised. The rolled material 5 immediately after completion of reverse rolling is guided to the first roller leveler 2 and leveled. The rolled material 5 after leveling is introduced into the cooling device 3 to perform accelerated cooling.
加速冷却後復熱した圧延材５を第２ローラレベラ１１に
誘導してレベリングを行う。After accelerated cooling, the reheated rolled material 5 is guided to the second roller leveler 11 for leveling.
第１ローラレベラ２の上部レベラロール２は、慣用の流
体圧シリンダ、スクリ、Ｊ、機構等の移動機構２２によ
って昇降される。The upper leveler roll 2 of the first roller leveler 2 is raised and lowered by a moving mechanism 22 such as a conventional hydraulic cylinder, scraper, J, mechanism, or the like.
リバース圧延機と冷却装置３との間隔は約３０ｚである
。冷却装置３の出側と第２ローラレベラ４の天測との間
隔Ｓは約３０ｚである。The distance between the reverse rolling mill and the cooling device 3 is approximately 30z. The distance S between the outlet side of the cooling device 3 and the astronomical position of the second roller leveler 4 is approximately 30z.
本発明の方法の具体的実施例について説明する。A specific example of the method of the present invention will be described.
厚鋼板の寸法は、板厚２０ｚｚ ｘ板幅３０００ｉｕ＋
Ｘ板長２０ｚである。The dimensions of the thick steel plate are plate thickness 20zz x plate width 3000iu+
The X plate length is 20z.
加速冷却の結宅を第１ｋに示す。な才３従来法としては
、特開昭５４−１２４８６４号公報開示によった。The result of accelerated cooling is shown in 1k. A conventional method is disclosed in Japanese Patent Application Laid-open No. 124864/1983.
第１表 （ト）効 果 本発明の方法によれば、 下記の効果が得られる。Table 1 (g) Effect According to the method of the invention, The following effects can be obtained.
■圧延直後にレベリングおよび水冷を行うことで、鋼板
が平坦状態で水冷が可能となり、均一冷却が可能となる
。■ By performing leveling and water cooling immediately after rolling, water cooling can be performed while the steel plate is flat, making uniform cooling possible.
■圧延直後にレベリングおよび水冷を行うことにより、
冶金的な結晶粒径の微細化に効果をもたらし、高強度、
高靭性鋼の製造が可能となる。■By leveling and water cooling immediately after rolling,
It has the effect of metallurgically refining the grain size, resulting in high strength and
It becomes possible to manufacture high-toughness steel.
■鋼板復熱後にレベリングを行うことにより、平坦度不
良が発生しない加速冷却鋼板の製造が可能となる。■ By leveling the steel plate after reheating, it becomes possible to manufacture accelerated cooling steel plates without flatness defects.
■平用度不良率を促來法よりも半減することができる９■It is possible to reduce the average defective rate by half compared to the promotion method9
第１図は厚鋼板の製造過程にわける本発明の方法を適用
したラインの説明図。FIG. 1 is an explanatory diagram of a line to which the method of the present invention is applied, divided into the manufacturing process of thick steel plates.
Claims (1)
できる第１ローラレベラを配置し、該第１ローラレベラ
の出側直近に冷却装置を設け、該冷却装置の出側に所定
の間隔をあけて第２ローラレベラを設けること、圧延材
のリバース圧延中は前記第１ローラレベラの上部レベラ
ロールを上昇させておくこと、該リバース圧延完了直後
の圧延材を前記第１ローラレベラに誘導してレベリング
を行うこと、該レベリング後の圧延材を前記冷却装置に
導入して加速冷却を行うこと、加速冷却後復熱した圧延
材を前記第２ローラレベラに誘導してレベリングを行う
ことからなる厚鋼板の加速冷却方法。A first roller leveler that can move the upper leveler roll up and down is arranged on the exit side of the reverse rolling mill, a cooling device is provided immediately on the exit side of the first roller leveler, and a second roller leveler is installed at a predetermined interval on the exit side of the cooling device. providing a roller leveler; raising an upper leveler roll of the first roller leveler during reverse rolling of the rolled material; guiding the rolled material immediately after completion of the reverse rolling to the first roller leveler for leveling; and leveling. A method for accelerated cooling of a thick steel plate, which comprises introducing the subsequent rolled material into the cooling device to perform accelerated cooling, and guiding the reheated rolled material after accelerated cooling to the second roller leveler to perform leveling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26546289A JPH03128122A (en) | 1989-10-12 | 1989-10-12 | Accelerated cooling method of thick steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26546289A JPH03128122A (en) | 1989-10-12 | 1989-10-12 | Accelerated cooling method of thick steel plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03128122A true JPH03128122A (en) | 1991-05-31 |
Family
ID=17417508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26546289A Pending JPH03128122A (en) | 1989-10-12 | 1989-10-12 | Accelerated cooling method of thick steel plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03128122A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1110218A (en) * | 1997-06-27 | 1999-01-19 | Nkk Corp | Cooling method for hot steel sheet |
| WO2003033185A1 (en) * | 2001-10-10 | 2003-04-24 | Jfe Steel Corporation | Method of manufacturing steel plate |
| KR100660201B1 (en) * | 2005-07-20 | 2006-12-21 | 주식회사 포스코 | Manufacturing method of thick plate with excellent flatness |
| JP2012245521A (en) * | 2011-05-25 | 2012-12-13 | Jp Steel Plantech Co | Roller leveler, and treatment equipment and treatment method of metal plate using the same |
-
1989
- 1989-10-12 JP JP26546289A patent/JPH03128122A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1110218A (en) * | 1997-06-27 | 1999-01-19 | Nkk Corp | Cooling method for hot steel sheet |
| WO2003033185A1 (en) * | 2001-10-10 | 2003-04-24 | Jfe Steel Corporation | Method of manufacturing steel plate |
| JP2010029943A (en) * | 2001-10-10 | 2010-02-12 | Jfe Steel Corp | Method of manufacturing steel plate |
| KR100660201B1 (en) * | 2005-07-20 | 2006-12-21 | 주식회사 포스코 | Manufacturing method of thick plate with excellent flatness |
| JP2012245521A (en) * | 2011-05-25 | 2012-12-13 | Jp Steel Plantech Co | Roller leveler, and treatment equipment and treatment method of metal plate using the same |
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