JP3297216B2 - Hot steel sheet rolling method - Google Patents
Hot steel sheet rolling methodInfo
- Publication number
- JP3297216B2 JP3297216B2 JP22082394A JP22082394A JP3297216B2 JP 3297216 B2 JP3297216 B2 JP 3297216B2 JP 22082394 A JP22082394 A JP 22082394A JP 22082394 A JP22082394 A JP 22082394A JP 3297216 B2 JP3297216 B2 JP 3297216B2
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- JP
- Japan
- Prior art keywords
- cooling
- rolling
- steel sheet
- width
- spray
- 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.)
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- Control Of Metal Rolling (AREA)
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、熱鋼板を熱間圧延機で
冷却しながら圧延する熱鋼板の圧延方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rolling a hot steel sheet while cooling the hot steel sheet with a hot rolling mill.
【０００２】[0002]
【従来の技術】熱鋼板の圧延方法において、強度および
靱性に優れた鋼板の製造方法として制御圧延が広く用い
られるようになってきている。この制御圧延は、圧延中
の圧延温度を精度よく制御し、最終圧延仕上げ温度をＡ
ｒ3 変態点温度直上にすることにより組織を微細化し、
強度および靱性の改善を図ることができる。2. Description of the Related Art In a method for rolling a hot steel sheet, controlled rolling has been widely used as a method for producing a steel sheet having excellent strength and toughness. In this controlled rolling, the rolling temperature during rolling is accurately controlled, and the final rolling finishing temperature is set to A.
By making the temperature right above the r 3 transformation point, the structure is refined,
Strength and toughness can be improved.
【０００３】この制御圧延は、従来、図１０に示すよう
に、成品板厚ｔに対しある厚みの移送厚で一旦圧延を留
め、その後、自然放冷によりその時の温度Ｔ1 から所定
温度Ｔ2 まで冷却した後再び圧延を行い、成品板厚ｔに
なる最終圧延時の最終仕上げ温度がＡｒ3 変態点温度直
上になるようにしていた。冷却に自然放冷を採用する理
由は、例えば冷却速度の速い水冷では不均一冷却となら
ざるを得ず、大幅な歩留低下が発生するためである。Conventionally, as shown in FIG. 10, this controlled rolling temporarily stops rolling at a transfer thickness of a certain thickness with respect to a product sheet thickness t, and then is allowed to cool naturally to a predetermined temperature T 2 from the temperature T 1 at that time. After the cooling, the rolling was performed again, so that the final finishing temperature at the time of final rolling to obtain the product thickness t was just above the Ar 3 transformation point temperature. The reason why the natural cooling is adopted as the cooling is that, for example, water cooling with a high cooling rate has to be non-uniform cooling, and a large decrease in yield occurs.
【０００４】この制御圧延では、圧延を中断して冷却速
度の遅い自然放冷で冷却するために、圧延能率の低下が
著しい。また、自然放冷中の冷却制御手段がないため、
鋼板表裏面の温度偏差や鋼板フロント／テール部、板幅
エッジ部の温度低下が発生する。In this controlled rolling, since the rolling is interrupted and cooling is carried out by natural cooling with a slow cooling rate, the rolling efficiency is significantly reduced. In addition, since there is no cooling control means during natural cooling,
A temperature deviation between the front and rear surfaces of the steel sheet and a temperature drop at the front / tail portion of the steel plate and the edge portion of the width of the steel plate occur.
【０００５】この制御圧延に代わる方法として、例えば
特開昭５５−１０６６１５号公報には、放冷を水冷に代
えて圧延能率の低下を防止する方法が記載されている
が、鋼板内部の温度制御手段については記載されていな
い。As an alternative to the controlled rolling, for example, Japanese Patent Application Laid-Open No. Sho 55-106615 describes a method of preventing the reduction of the rolling efficiency by replacing water cooling with water cooling. No means is described.
【０００６】[0006]
【発明が解決しようとする課題】厚鋼板の冷却において
は、冷却速度が速くなるほど冷却の不均一、特に鋼板フ
ロント／テール部および板幅エッジ部に過冷却部が発生
し易くなる。そこで、このような不均一冷却に対する制
御手段を持たない水冷却は、制御圧延材のように鋼板内
部温度偏差の均一性を要求される鋼種には使用できな
い。しかし、自然放冷でも鋼板フロント／テール部およ
び板幅エッジ部に若干の過冷却部が発生することは避け
られず、この過冷却による歩留低下が発生する。In the cooling of a thick steel plate, as the cooling rate is increased, the cooling becomes more uneven, and particularly, a supercooled portion is more likely to be generated at a front / tail portion of the steel plate and a width edge portion of the steel plate. Therefore, water cooling without a control means for such non-uniform cooling cannot be used for a steel type which requires uniformity of the temperature deviation inside the steel sheet such as a controlled rolled material. However, even under natural cooling, it is inevitable that some supercooled portions occur at the front / tail portions of the steel sheet and the edge portions of the sheet width, and the yield decreases due to the supercooling.
【０００７】また、自然放冷は冷却速度が遅いため、長
い冷却時間すなわち圧延中断時間が必要となり、圧延能
率の低下が著しい。圧延能率の低下を防止するために
は、自然放冷を水冷等の急冷手段に変更することが望ま
しいが、急冷を採用すると鋼板内不均一冷却を助長する
ことになるので、不均一冷却を防止するための冷却手段
の開発が不可欠である。[0007] In addition, since natural cooling has a slow cooling rate, a long cooling time, that is, a rolling interruption time is required, and the rolling efficiency is significantly reduced. In order to prevent a reduction in rolling efficiency, it is desirable to change natural cooling to rapid cooling means such as water cooling.However, adopting rapid cooling promotes uneven cooling in the steel sheet, thus preventing uneven cooling. It is indispensable to develop a cooling means for cooling.
【０００８】図１０に鋼板温度履歴を示した自然放冷に
よる圧延は、表１に示すように、スラブ厚２４０ｍｍ、
成品板厚２０ｍｍの制御圧延材を圧延した例である。こ
の例では温度制御のための圧延中断時間が総圧延時間の
３３％を占めており、圧延能率の低下が著しい。[0008] As shown in Table 1, the steel sheet temperature history shown in FIG.
This is an example in which a controlled rolled material having a product thickness of 20 mm is rolled. In this example, the rolling interruption time for temperature control accounts for 33% of the total rolling time, and the rolling efficiency is significantly reduced.
【０００９】また、図１１および図１２には同じ例の冷
却終了時の板幅エッジ部および鋼板フロント／テール部
の温度パターンを示す。この例では、板幅エッジ部で約
９０ｍｍ、鋼板フロント／テール部で１．５ｍの温度低
下部が発生している。FIG. 11 and FIG. 12 show temperature patterns at the edge of the sheet width and at the front / tail of the sheet at the end of cooling in the same example. In this example, a temperature drop of about 90 mm occurs at the edge of the plate width and 1.5 m at the front / tail portion of the steel plate.
【００１０】[0010]
【表１】 [Table 1]
【００１１】また、冷却のみを自然放冷から水冷却に変
更した例の圧延スケジュールを表２に、鋼板温度履歴を
図１３に、冷却終了時の板幅エッジ部および鋼板フロン
ト／テール部の温度パターンを図１４、図１５に示す。Table 2 shows the rolling schedule of the example in which only cooling was changed from natural cooling to water cooling, and FIG. 13 shows the steel sheet temperature history. The temperatures of the sheet width edge portion and the steel plate front / tail portion at the end of cooling were shown. The patterns are shown in FIGS.
【００１２】[0012]
【表２】 [Table 2]
【００１３】これらからわかるように、自然放冷を水冷
に変更することで圧延能率は約３３％向上するが、板幅
エッジ部および鋼板フロント／テール部の温度降下量お
よび温度降下域の増加が著しく、歩留が約５％悪化す
る。As can be seen from the above, by changing the natural cooling to the water cooling, the rolling efficiency is improved by about 33%, but the temperature drop amount and the temperature drop area of the sheet width edge portion and the steel plate front / tail portion are increased. Significantly, the yield deteriorates by about 5%.
【００１４】そこで本発明は、厚鋼板の強度および靱性
向上のために所定の温度域で所定の圧下量が必要な制御
圧延方法において、熱間圧延機で圧延中の熱鋼板を制御
冷却することにより鋼板内部の所定温度偏差を確保し、
且つ、圧延能率の大幅な向上を図ることを目的とする。Accordingly, the present invention provides a controlled rolling method which requires a predetermined rolling reduction in a predetermined temperature range in order to improve the strength and toughness of a thick steel plate, wherein the hot rolling mill controls and cools the hot steel plate during rolling. Ensures a predetermined temperature deviation inside the steel sheet,
Moreover, it aims at achieving a significant improvement in rolling efficiency.
【００１５】[0015]
【課題を解決するための手段】本発明の熱鋼板の圧延方
法は、熱鋼板表裏面の熱鋼板進行方向に一つ以上の冷却
ヘッダーを有し、熱鋼板幅方向に複数のスプレーノズル
を有し、冷却ヘッダー単位の冷却水制御手段およびスプ
レーノズル単位のオンオフ制御手段を有する冷却装置を
圧延機の直前および／または直後に配置し、熱鋼板を冷
却しながら複数パス圧延する際、特定の圧延パスにおけ
る冷却スプレー幅を圧延中の鋼板幅以下に設定し、且
つ、鋼板フロント／テール部の特定範囲のスプレーを遮
断することを特徴とする熱鋼板の圧延方法である。その
際、圧延パス毎に冷却スプレー幅および鋼板フロント／
テール部のスプレー遮断長の設定を変更することが望ま
しい。The hot steel sheet rolling method of the present invention has one or more cooling headers in the advancing direction of the hot steel sheet on the front and back surfaces of the hot steel sheet, and has a plurality of spray nozzles in the width direction of the hot steel sheet. When a cooling device having a cooling water control means for each cooling header and an on / off control means for each spray nozzle is arranged immediately before and / or immediately after the rolling mill, a specific rolling process is performed when performing multiple-pass rolling while cooling a hot steel plate. A method for rolling a hot steel sheet, wherein a width of a cooling spray in a pass is set to be equal to or less than a width of a steel sheet being rolled, and a spray in a specific range of a front / tail portion of the steel sheet is cut off. At that time, the cooling spray width and steel plate front /
It is desirable to change the setting of the spray cutoff length of the tail section.
【００１６】[0016]
【作用】本発明により、冷却による圧延能率の低下が発
生せず、且つ、鋼板表裏全面にわたって均一な冷却が達
成できる。エッジマスキング制御は、所定の冷却スプレ
ー幅になるように冷却しない外側のスプレーノズルをオ
フにし、冷却する内側のスプレーノズルをオンにするこ
とで冷却スプレー幅を鋼板幅より狭くし、板幅エッジ部
の過冷却を防止する。この時の冷却スプレー幅と鋼板幅
との差をエッジマスキング量とする。また、フロント／
テールマスキング制御は、スプレーノズルを所定のタイ
ミングで一斉に噴射および停止することで行う。According to the present invention, the cooling efficiency does not decrease due to cooling, and uniform cooling can be achieved over the entire front and back surfaces of the steel sheet. In the edge masking control, the cooling spray width is made smaller than the steel plate width by turning off the outer spray nozzles that are not cooled so as to have a predetermined cooling spray width, and turning on the inner spray nozzles that are cooled, so that the plate width edge portion is formed. Prevent supercooling of the The difference between the cooling spray width and the steel sheet width at this time is defined as the edge masking amount. In addition, front /
The tail masking control is performed by simultaneously spraying and stopping the spray nozzles at a predetermined timing.
【００１７】[0017]
【実施例】スラブ厚２４０ｍｍ、成品厚２０ｍｍの実施
例を示す。EXAMPLE An example in which the slab thickness is 240 mm and the product thickness is 20 mm will be described.
【００１８】制御圧延を行うため、成品厚の約２倍の板
厚で温度待ちを行った。温度待ち後、圧延を再開すると
きの鋼板温度は８５０℃以下とした。In order to perform the controlled rolling, the temperature was waited at a plate thickness approximately twice the product thickness. After waiting for the temperature, the temperature of the steel sheet when rolling was restarted was 850 ° C. or less.
【００１９】図１に圧延装置を示す。冷却装置２を圧延
機１の直前、直後にそれぞれ上下一対配置した。図２に
示すように、冷却装置の冷却ヘッダー４には、外部の冷
却制御装置６で１個１個単独にオンオフできるスプレー
ノズル５を配置した。FIG. 1 shows a rolling apparatus. A pair of upper and lower cooling devices 2 were arranged immediately before and immediately after the rolling mill 1, respectively. As shown in FIG. 2, spray nozzles 5 that can be turned on and off individually by an external cooling control device 6 are arranged in the cooling header 4 of the cooling device.
【００２０】この冷却装置を用いて、鋼板四周部の過冷
却防止のため、板幅エッジ部の過冷却を防止するエッジ
マスキング制御、および鋼板フロント／テール部の過冷
却を防止するフロント／テールマスキング制御を行っ
た。エッジマスキング制御は、複数のスプレーノズルの
オンオフを制御して鋼板幅と冷却スプレー幅との差で制
御を行った。また、フロント／テールマスキング制御
は、図３に示すように、鋼板先行端圧延時に圧延機ロー
ドセルに発生するオンオフ信号をもとに、所定の制御長
になった時点で、スプレーノズルを一斉にオフ状態から
オン状態に、または、オン状態からオフ状態に移行する
ことで制御を行った。Using this cooling device, edge masking control for preventing overcooling of the width edge of the steel plate and front / tail masking for preventing overcooling of the front / tail portion of the steel plate in order to prevent overcooling of the four peripheral portions of the steel plate. Control was performed. In the edge masking control, on / off of a plurality of spray nozzles was controlled to perform control based on a difference between a steel sheet width and a cooling spray width. Further, as shown in FIG. 3, the front / tail masking control simultaneously turns off the spray nozzles when a predetermined control length is reached based on an on / off signal generated at the rolling cell load cell during the leading end rolling of the steel sheet. Control was performed by transitioning from the on state to the on state or from the on state to the off state.
【００２１】この時の圧延スケジュールを表３に示す。
エッジマスキング制御は圧延第７〜１２パスで、フロン
ト／テールマスキング制御は圧延パス第９〜１２パスで
実施した。Table 3 shows the rolling schedule at this time.
The edge masking control was performed in the 7th to 12th rolling passes, and the front / tail masking control was performed in the 9th to 12th rolling passes.
【００２２】[0022]
【表３】 [Table 3]
【００２３】その結果、圧延後の鋼板四周部の温度分布
は格段に改善された。図４に板幅エッジ部の温度分布
を、図５に鋼板フロント／テール部の温度分布を示す。
これから判るように、従来の自然放冷による圧延に比
べ、板幅エッジ部で約３０℃、鋼板フロント／テール部
で約７０℃温度分布を改善できた。材質改善結果は、図
６〜９に示す。温度分布と同様に、従来の自然放冷によ
る圧延に比べ、ＹＰおよびＴＳも大幅に改善できた。こ
れにより、圧延能率で３３％、歩留で５％向上できた。As a result, the temperature distribution at the four peripheral portions of the steel sheet after rolling was remarkably improved. FIG. 4 shows the temperature distribution at the edge portion of the sheet width, and FIG.
As can be seen, the temperature distribution was improved by about 30 ° C. at the edge of the sheet width and by about 70 ° C. at the steel sheet front / tail part, as compared with the conventional rolling by natural cooling. The results of the material improvement are shown in FIGS. Similar to the temperature distribution, YP and TS were also significantly improved as compared to the conventional rolling by natural cooling. This improved the rolling efficiency by 33% and the yield by 5%.
【００２４】[0024]
【発明の効果】本発明によれば、所定の温度域で所定の
圧下量が必要な制御圧延において、冷却による圧延能率
の低下を回避でき、且つ、鋼板表裏全面にわたって均一
な冷却が達成できる。According to the present invention, in controlled rolling requiring a predetermined amount of reduction in a predetermined temperature range, a reduction in rolling efficiency due to cooling can be avoided, and uniform cooling over the entire front and back surfaces of the steel sheet can be achieved.
【図１】本発明を実施するために使用する圧延装置の例
を示す図である。FIG. 1 is a diagram showing an example of a rolling mill used to carry out the present invention.
【図２】本発明を実施するために使用する冷却装置の例
を示す図である。FIG. 2 is a diagram showing an example of a cooling device used to carry out the present invention.
【図３】本発明法における冷却水の噴射パターンを示す
図である。FIG. 3 is a view showing an injection pattern of cooling water in the method of the present invention.
【図４】本発明法によりエッジマスキング制御しながら
圧延した鋼板の板幅エッジ部の温度分布を示す図であ
る。FIG. 4 is a diagram showing a temperature distribution at a width edge portion of a steel sheet rolled while performing edge masking control according to the method of the present invention.
【図５】本発明法によりフロント／テールマスキング制
御しながら圧延した鋼板の鋼板フロント／テール部の温
度分布を示す図である。FIG. 5 is a diagram showing a temperature distribution of a steel plate front / tail portion of a steel sheet rolled while performing front / tail masking control according to the method of the present invention.
【図６】本発明法によりエッジマスキング制御しながら
圧延した鋼板の板幅エッジ部における材質ＹＰの分布を
示す図である。FIG. 6 is a diagram showing a distribution of a material YP at a sheet width edge portion of a steel sheet rolled while performing edge masking control according to the method of the present invention.
【図７】本発明法によりエッジマスキング制御しながら
圧延した鋼板の板幅エッジ部における材質ＴＳの分布を
示す図である。FIG. 7 is a diagram showing a distribution of a material TS at a sheet width edge portion of a steel sheet rolled while performing edge masking control according to the method of the present invention.
【図８】本発明法によりフロント／テールマスキング制
御しながら圧延した鋼板の鋼板フロント／テール部にお
ける材質ＹＰの分布を示す図である。FIG. 8 is a diagram showing a distribution of a material YP in a steel plate front / tail portion of a steel sheet rolled while performing front / tail masking control according to the method of the present invention.
【図９】本発明法によりフロント／テールマスキング制
御しながら圧延した鋼板の鋼板フロント／テール部にお
ける材質ＴＳの分布を示す図である。FIG. 9 is a diagram showing a distribution of a material TS in a steel plate front / tail portion of a steel plate rolled while performing front / tail masking control according to the method of the present invention.
【図１０】従来の自然放冷による制御圧延における鋼板
温度履歴を示す図である。FIG. 10 is a diagram showing a steel sheet temperature history in conventional controlled rolling by natural cooling.
【図１１】従来の自然放冷による制御圧延で圧延した鋼
板の板幅エッジ部の温度分布を示す図である。FIG. 11 is a view showing a temperature distribution at a width edge portion of a steel sheet rolled by conventional control rolling by natural cooling.
【図１２】従来の自然放冷による制御圧延で圧延した鋼
板の鋼板フロント／テール部の温度分布を示す図であ
る。FIG. 12 is a diagram showing a temperature distribution of a steel plate front / tail portion of a steel plate rolled by conventional control rolling by natural cooling.
【図１３】従来の水冷による制御圧延における鋼板温度
履歴を示す図である。FIG. 13 is a diagram showing a steel sheet temperature history in conventional control rolling by water cooling.
【図１４】従来の水冷による制御圧延で圧延した鋼板の
板幅エッジ部の温度分布を示す図である。FIG. 14 is a diagram showing a temperature distribution at a width edge portion of a steel sheet rolled by conventional control rolling by water cooling.
【図１５】従来の水冷による制御圧延で圧延した鋼板の
鋼板フロント／テール部の温度分布を示す図である。FIG. 15 is a diagram showing a temperature distribution of a steel plate front / tail portion of a steel plate rolled by conventional control rolling by water cooling.
１ 圧延機 ２ 冷却装置 ３ 熱鋼板 ４ 冷却ヘッダー ５ スプレーノズル ６ 冷却制御装置 DESCRIPTION OF SYMBOLS 1 Rolling machine 2 Cooling device 3 Hot steel plate 4 Cooling header 5 Spray nozzle 6 Cooling control device
フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B21B 37/00 - 37/78 B21B 45/02 Continuation of front page (58) Field surveyed (Int.Cl. 7 , DB name) B21B 37/00-37/78 B21B 45/02
Claims (2)
上の冷却ヘッダーを有し、熱鋼板幅方向に複数のスプレ
ーノズルを有し、冷却ヘッダー単位の冷却水制御手段お
よびスプレーノズル単位のオンオフ制御手段を有する冷
却装置を圧延機の直前および／または直後に配置し、熱
鋼板を冷却しながら複数パス圧延する際、特定の圧延パ
スにおける冷却スプレー幅を圧延中の鋼板幅以下に設定
し、且つ、鋼板フロント／テール部の特定範囲のスプレ
ーを遮断することを特徴とする熱鋼板の圧延方法。1. A cooling water control means and a spray nozzle unit each having one or more cooling headers in a hot steel sheet traveling direction on the front and rear surfaces of the hot steel sheet and a plurality of spray nozzles in a width direction of the hot steel sheet. When a cooling device having on / off control means is disposed immediately before and / or immediately after a rolling mill, and a plurality of passes are rolled while cooling a hot steel plate, a cooling spray width in a specific rolling pass is set to be equal to or less than a width of a steel plate being rolled. A method for rolling a hot steel sheet, wherein a spray in a specific range of a front / tail portion of the steel sheet is cut off.
いて、圧延パス毎に冷却スプレー幅および鋼板フロント
／テール部のスプレー遮断長の設定を変更することを特
徴とする熱鋼板の圧延方法。2. The method for rolling a hot steel sheet according to claim 1, wherein the setting of the cooling spray width and the spray cutoff length of the front / tail portion of the steel sheet is changed for each rolling pass. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22082394A JP3297216B2 (en) | 1994-08-24 | 1994-08-24 | Hot steel sheet rolling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22082394A JP3297216B2 (en) | 1994-08-24 | 1994-08-24 | Hot steel sheet rolling method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0857520A JPH0857520A (en) | 1996-03-05 |
| JP3297216B2 true JP3297216B2 (en) | 2002-07-02 |
Family
ID=16757116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22082394A Expired - Fee Related JP3297216B2 (en) | 1994-08-24 | 1994-08-24 | Hot steel sheet rolling method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3297216B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104138911B (en) * | 2014-05-27 | 2016-06-29 | 南京钢铁股份有限公司 | A kind of method of cut deal intermediate blank rapid water cooling temperature control |
| JP6658457B2 (en) * | 2016-11-02 | 2020-03-04 | Ｊｆｅスチール株式会社 | Thick steel plate manufacturing method and rolling pass schedule setting method |
| CN115090685A (en) * | 2022-06-06 | 2022-09-23 | 首钢京唐钢铁联合有限责任公司 | Strip steel control method, device, equipment and medium |
-
1994
- 1994-08-24 JP JP22082394A patent/JP3297216B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0857520A (en) | 1996-03-05 |
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