JP4852999B2 - Steel manufacturing method and hot rolling equipment used therefor - Google Patents

Steel manufacturing method and hot rolling equipment used therefor Download PDF

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JP4852999B2
JP4852999B2 JP2005341322A JP2005341322A JP4852999B2 JP 4852999 B2 JP4852999 B2 JP 4852999B2 JP 2005341322 A JP2005341322 A JP 2005341322A JP 2005341322 A JP2005341322 A JP 2005341322A JP 4852999 B2 JP4852999 B2 JP 4852999B2
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hot rolling
steel material
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cooling
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JP2007144453A (en
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昭博 奥野
直人 平田
展也 池田
倫夫 田中
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JFE Steel Corp
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Description

本発明は、鋼材の製造方法およびそれ用いる熱間圧延設備に関するものである。 The present invention relates to steel production and hot rolling equipment Ru use therein.

例えば、厚板圧延においては、圧延途中で制御圧延(Controlled Rolling;CR)を施すことにより、優れた材質の鋼材を造り込んでいる。   For example, in thick plate rolling, an excellent steel material is built by performing controlled rolling (CR) during rolling.

その際に、制御圧延を行う時の温度(制御圧延開始温度)が低くかつ制御圧延を行う時の板厚(制御圧延開始板厚)が厚い場合には、圧延材が制御圧延開始温度になるまでにかなりの時間を要するため、熱間圧延機(可逆式熱間圧延機)近傍の搬送テーブル上で制御圧延開始温度になるまで圧延材を待機させていた。その結果、その冷却待ちによって熱間圧延機に空き時間が発生し、圧延能率が阻害されるという問題が生じていた。   At that time, when the temperature at the time of controlled rolling (controlled rolling start temperature) is low and the plate thickness at the time of controlled rolling (controlled rolling start plate thickness) is thick, the rolled material becomes the controlled rolling start temperature. Since a considerable amount of time is required, the rolled material is kept on standby until the controlled rolling start temperature is reached on the conveyance table in the vicinity of the hot rolling mill (reversible hot rolling mill). As a result, there is a problem that idle time is generated in the hot rolling mill due to the waiting for cooling, and the rolling efficiency is hindered.

このような冷却待ちによって熱間圧延機に空き時間が発生し圧延能率が阻害されるのを回避するために、例えば、特許文献1には、熱間圧延ラインの仕上圧延機入側において、搬送テーブル上の高温の圧延材を後続の圧延材が通過できる高さに持ち上げて待機状態に保持する片持ちフォーク状のアームを有する昇降装置を備えた圧延材の待機装置が開示されている。
特開平4−274814号公報
In order to avoid that the idle time is generated in the hot rolling mill due to such cooling waiting and the rolling efficiency is hindered, for example, in Patent Document 1, transport is performed on the finishing rolling mill entrance side of the hot rolling line. There is disclosed a standby device for a rolled material including a lifting device having a cantilevered fork-like arm that lifts a hot rolled material on a table to a height at which a subsequent rolled material can pass and holds it in a standby state.
JP-A-4-274814

しかし、前記特許文献1には、待機装置を用いて追い越し圧延を行うことができることが示唆されているが、冷却待ちを要する制御圧延材が含まれている場合に、どのように圧延を行えば、熱間圧延機の空き時間を低減して、圧延能率を向上させることができるかについては示されていない。   However, although it has been suggested in Patent Document 1 that overtaking rolling can be performed using a standby device, if a controlled rolling material that requires waiting for cooling is included, how to perform rolling? It is not shown whether the rolling mill efficiency can be improved by reducing the idle time of the hot rolling mill.

例えば、特許文献1に記載の待機装置を用いる場合、そのままでは、後続の圧延材を通過させた後、待機させていた制御圧延材をタイミング良く引き続いて圧延することが難しい。すなわち、待機装置にて制御圧延材を所定の温度になるまで空冷状態で待機させている間、追い越す圧延材を常に準備しておくことは難しく、熱間圧延機が空の状態になる状況が頻発する。そのため、時間当たりの生産量の減少を余儀なくされる。   For example, when the standby device described in Patent Document 1 is used, it is difficult to continue rolling the control rolled material that has been on standby with good timing after passing the subsequent rolled material. That is, it is difficult to always prepare the rolling material to be overtaken while the standby rolling device is waiting in the air-cooled state until the control rolled material reaches a predetermined temperature, and the hot rolling mill is in an empty state. Frequently occurs. Therefore, the production volume per hour is inevitably reduced.

本発明は、上記のような事情に鑑みてなされたものであり、冷却待ちを要する制御圧延材が含まれている場合でも、熱間圧延機の空き時間を低減して、圧延能率を向上させることができる鋼材の製造方法とそれ用いる熱間圧延設備を提供することを目的とするものである。 The present invention has been made in view of the circumstances as described above, and reduces the idle time of a hot rolling mill and improves the rolling efficiency even when a control rolled material requiring waiting for cooling is included. it it is an object to provide a hot rolling facility Ru using the method and its production of steel can.

上記課題を解決するために、本発明は以下の特徴を有する。   In order to solve the above problems, the present invention has the following features.

[1]可逆式熱間圧延機の上流側に、温度計を有し、冷却待ちを要する圧延材を搬送テーブル上から上方に持ち上げて後続の圧延材が通過できる場所に待機させるための待機装置としての保持装置を備え、かつ該待機装置としての保持装置は待機中の前記冷却待ちを要する圧延材を冷却する水冷装置を有する熱間圧延設備を用いた鋼材の製造方法であって、
冷却待ちを要する鋼材を前記可逆式熱間圧延機で所定の板厚に圧延した後、該冷却待ちを要する鋼材を前記待機装置としての保持装置で後続の鋼材が通過できる場所に待機させ、後続の鋼材を前記可逆式熱間圧延機で圧延する一方で、待機中の前記冷却待ちを要する鋼材を所定温度になるように水冷した後、搬送テーブル上に戻し、前記後続の鋼材に引き続いて前記可逆式熱間圧延機で仕上圧延することを特徴とする鋼材の製造方法。
[1] A standby device that has a thermometer on the upstream side of the reversible hot rolling mill, and lifts the rolled material that needs to be cooled from the transfer table upwards so that the subsequent rolled material can pass through. A holding device as the standby device, and the holding device as a standby device is a method of manufacturing a steel material using a hot rolling facility having a water cooling device for cooling the rolled material that is waiting to be cooled .
After rolling the steel material that needs to be cooled to a predetermined thickness with the reversible hot rolling mill, the steel material that needs to be cooled is waited at a place where the subsequent steel material can pass through the holding device as the standby device, While rolling the steel material with the reversible hot rolling mill, the steel material that needs to be cooled while waiting is water-cooled so as to reach a predetermined temperature, and then returned to the transfer table, followed by the subsequent steel material. A method for producing a steel material, comprising finish rolling with a reversible hot rolling mill.

]前記[1]に記載の鋼材の製造方法に用いる熱間圧延設備であって、
可逆式熱間圧延機の上流側に、温度計を有し、冷却待ちを要する圧延材を搬送テーブル上から上方に持ち上げて後続の圧延材が通過できる場所に待機させるための待機装置としての保持装置を備え、かつ該待機装置としての保持装置は待機中の前記冷却待ちを要する圧延材を冷却する水冷装置を有することを特徴とする熱間圧延設備。
[ 2 ] A hot rolling facility used in the method for producing a steel material according to [1] ,
Upstream of the reversible hot rolling mill, it has a thermometer and holds it as a standby device for lifting the rolled material that needs to wait for cooling from the transfer table and waiting it in a place where the following rolled material can pass. A hot-rolling facility comprising a device and a holding device as a standby device includes a water-cooling device that cools the rolled material that is in a standby state and needs to be cooled.

本発明においては、後続の圧延材の圧延終了時刻に合わせて、待機中の圧延材(制御圧延材)を水冷装置によって所定時刻に所定温度になるように冷却することが可能であるので、熱間圧延機が空になることなく圧延材を圧延することができ、圧延能率を向上させることができる。   In the present invention, in accordance with the rolling end time of the subsequent rolled material, the standby rolled material (control rolled material) can be cooled to a predetermined temperature at a predetermined time by a water cooling device. The rolled material can be rolled without emptying the intermediate rolling mill, and the rolling efficiency can be improved.

本発明の実施形態を図面に基づいて説明する。なお、ここでは、圧延材が鋼材である場合を例にして述べる。   Embodiments of the present invention will be described with reference to the drawings. Here, a case where the rolled material is a steel material will be described as an example.

図1は、本発明の一実施形態に係る熱間圧延設備のレイアウトと、その熱間圧延設備を用いた鋼材の製造方法の手順を示す図である。図1において、1は加熱炉、3は待機装置としての保持装置、4は可逆式熱間圧延機である。   FIG. 1 is a diagram showing a layout of a hot rolling facility according to an embodiment of the present invention and a procedure of a method for manufacturing a steel material using the hot rolling facility. In FIG. 1, 1 is a heating furnace, 3 is a holding device as a standby device, and 4 is a reversible hot rolling mill.

ここで、保持装置3は、可逆式熱間圧延機4の上流側に設けられ、高温の鋼材を搬送テーブル上から後続の鋼材が通過できる高さに持ち上げて保持し、待機させるためのものである。そして、保持装置3は、保持している高温の鋼材を冷却するための水冷装置41を有している。また、保持装置3には、鋼材の温度を測定するために、温度計5が取り付けられている。   Here, the holding device 3 is provided on the upstream side of the reversible hot rolling mill 4 to lift and hold a high-temperature steel material to a height at which the subsequent steel material can pass from the transfer table, and to wait. is there. And the holding | maintenance apparatus 3 has the water cooling apparatus 41 for cooling the high temperature steel material currently hold | maintained. Moreover, the thermometer 5 is attached to the holding device 3 in order to measure the temperature of the steel material.

図2は、上記の保持装置3の一例を示す図である。この保持装置3は、搬送テーブル(ローラテーブル)11の両側に対向して設けられた支柱21と、対向する2本の支柱21に支持されながら支柱21に沿って昇降する横フレーム31と、横フレーム31に取り付けられ、搬送方向に延びる縦フレーム32と、縦フレーム32に2個1組で搬送方向に対して互いに対向するように取り付けられた複数組(例えば、10組)の支持アーム33と、それぞれの対向する支持アーム33に支持され、鋼材10を上面に載せて保持する複数本(例えば、10本)の保持ローラ34とを備えている。そして、横フレーム31を支柱21に沿って昇降させるために、各支柱21にそれぞれ近接して電動シリンダ22と作動用モータ23が設けられている。なお、保持ローラ34はテーブルローラ12とテーブルローラ12の間に位置するようになっており、待機させる鋼材10が保持ローラ34上に停止したら、そのまま保持ローラ34上に鋼材10を載せて所定の高さまで持ち上げるようになっている。   FIG. 2 is a diagram illustrating an example of the holding device 3 described above. The holding device 3 includes a support column 21 provided on both sides of a transport table (roller table) 11, a horizontal frame 31 that moves up and down along the support column 21 while being supported by two opposing support columns 21, and a horizontal frame 31. A vertical frame 32 attached to the frame 31 and extending in the transport direction, and a plurality of sets (for example, 10 pairs) of support arms 33 attached to the vertical frame 32 so as to face each other in the transport direction. And a plurality of (for example, ten) holding rollers 34 that are supported by the opposing support arms 33 and hold the steel material 10 on the upper surface. In order to move the horizontal frame 31 up and down along the columns 21, an electric cylinder 22 and an operating motor 23 are provided in close proximity to the columns 21. The holding roller 34 is positioned between the table roller 12 and the table roller 12. When the steel material 10 to be standby is stopped on the holding roller 34, the steel material 10 is placed on the holding roller 34 as it is and a predetermined amount is set. It is designed to lift to height.

さらに、この保持装置3には、保持ローラ34上の鋼材10を冷却するための水冷装置41が設けられている。水冷装置41は、搬送方向に延びる所定本数(ここでは3本)の上ヘッダ42とそれに取り付けられた上ノズル43、および、搬送方向に延びる所定本数(ここでは2本)の下ヘッダ44とそれに取り付けられた下ノズル45を備えている。なお、水冷装置41による冷却によって鋼材10に冷却ムラが生じることを防止するために、モータ35によってベルト36を介して保持ローラ34を駆動することにより、鋼材10をオッシレーションできるようになっている。   Further, the holding device 3 is provided with a water cooling device 41 for cooling the steel material 10 on the holding roller 34. The water-cooling device 41 includes a predetermined number (three in this case) of upper headers 42 and three upper nozzles 43 attached thereto, and a predetermined number (two in this case) of lower headers 44 extending in the conveying direction. An attached lower nozzle 45 is provided. In order to prevent cooling unevenness from occurring in the steel material 10 due to cooling by the water cooling device 41, the steel material 10 can be oscillated by driving the holding roller 34 via the belt 36 by the motor 35. .

そして、このような熱間圧延設備を用いて、制御圧延材(第1のスラブA)と通常圧延材(第2のスラブB)を組み合わせて圧延する場合には、以下のような(1)〜(6)の手順により圧延を行う。ここで、制御圧延材は冷却待ちを要する鋼材の例として上げたものであり、通常圧延材は冷却待ちを要しない鋼材の例として上げたものである。   And when using such a hot rolling equipment and rolling by combining a control rolled material (first slab A) and a normal rolled material (second slab B), the following (1) Rolling is performed by the procedure of (6). Here, the control rolled material is an example of a steel material that needs to wait for cooling, and the normal rolled material is an example of a steel material that does not need to wait for cooling.

なお、可逆式熱間圧延機4において制御圧延材を圧延する際に、スラブ厚(例えば、215mm)から制御圧延開始板厚(例えば、80mm)までの圧延を粗圧延と呼び、制御圧延開始板厚から仕上板厚(仕上圧延後の板厚)までの圧延を仕上圧延と呼ぶことにする。   In addition, when rolling a control rolling material in the reversible hot rolling mill 4, rolling from a slab thickness (for example, 215 mm) to a control rolling start plate thickness (for example, 80 mm) is called rough rolling, and the control rolling start plate Rolling from the thickness to the finish plate thickness (plate thickness after finish rolling) is referred to as finish rolling.

(1)加熱炉1で所定温度(例えば、1150℃)に加熱された第1のスラブAは、搬送テーブル上を搬送され、保持装置3をそのまま通過して可逆式熱間圧延機4へ送られる。そして、可逆式熱間圧延機4で粗圧延を行う。   (1) The first slab A heated to a predetermined temperature (for example, 1150 ° C.) in the heating furnace 1 is transported on the transport table, passes through the holding device 3 as it is, and is sent to the reversible hot rolling mill 4. It is done. Then, rough rolling is performed by the reversible hot rolling mill 4.

(2)粗圧延が終了した第1のスラブAは、保持装置3に搬送され、保持装置3によって搬送テーブル上から上方に持ち上げられて保持される。   (2) The first slab A that has been subjected to rough rolling is transported to the holding device 3 and is lifted upward from the transport table by the holding device 3 and held.

(3)続いて、可逆式熱間圧延機4での第1のスラブAの粗圧延の進行に合わせて、第2のスラブBが加熱炉1から抽出され、保持装置3に保持された直後の第1のスラブAを追い越して、可逆式熱間圧延機4に到着する。   (3) Subsequently, immediately after the second slab B is extracted from the heating furnace 1 and held in the holding device 3 in accordance with the progress of the rough rolling of the first slab A in the reversible hot rolling mill 4. The first slab A is overtaken and arrives at the reversible hot rolling mill 4.

(4)可逆式熱間圧延機4に到着した第2のスラブBは、所定の仕上板厚まで圧延された後、精整工程に送られる。   (4) The second slab B that has arrived at the reversible hot rolling mill 4 is rolled to a predetermined finishing plate thickness, and then sent to the finishing step.

(5)一方、保持装置3に保持されている第1のスラブAは、第2のスラブBの圧延中に、水冷装置2によって所定の温度に冷却される。その際、第2のスラブBの圧延が終了したら、直ちに第1のスラブAの仕上圧延が開始できるように、保持装置3および搬送テーブル上での空冷時間と水冷装置41での水冷時間を調整する。
すなわち、保持装置3で第1のスラブAを保持中に、第1のスラブAの温度を温度計5によって測定し、その測温結果に基づいて、第2のスラブBの圧延終了予測時刻に、第1のスラブAの温度が制御圧延可能な温度(例えば、850℃)となるように、水冷装置41での水冷開始時刻と水冷終了時刻を設定する。そして、その設定に基づいて、第1のスラブAを水冷装置41によって水冷を行う。
(5) On the other hand, the first slab A held by the holding device 3 is cooled to a predetermined temperature by the water cooling device 2 during the rolling of the second slab B. At that time, when the rolling of the second slab B is completed, the air cooling time on the holding device 3 and the transfer table and the water cooling time on the water cooling device 41 are adjusted so that finish rolling of the first slab A can be started immediately. To do.
That is, while holding the first slab A by the holding device 3, the temperature of the first slab A is measured by the thermometer 5, and the rolling completion predicted time of the second slab B is based on the temperature measurement result. The water cooling start time and the water cooling end time in the water cooling device 41 are set so that the temperature of the first slab A becomes a temperature at which control rolling is possible (for example, 850 ° C.). And based on the setting, the 1st slab A is water-cooled with the water-cooling apparatus 41. FIG.

(6)そして、水冷装置41での水冷が終了した第1のスラブAは、搬送テーブル上に戻されて、可逆式熱間圧延機4に搬送され、第2のスラブBの圧延終了に引き続いて、仕上圧延された後、精整工程に送られる。   (6) Then, the first slab A that has been cooled by the water cooling device 41 is returned to the transport table, transported to the reversible hot rolling mill 4, and subsequently the second slab B is rolled. After finishing rolling, it is sent to the finishing process.

このように、この実施形態においては、後続の鋼材の圧延終了時刻に合わせて、保持装置3で待機している制御圧延材を水冷装置41によって所定時刻に所定温度になるように冷却できるので、熱間圧延機4が空になることなく鋼材を圧延することができ、例えば、従来の1.7倍の圧延能率を得ることができる。   Thus, in this embodiment, the control rolling material waiting in the holding device 3 can be cooled to a predetermined temperature at a predetermined time by the water cooling device 41 in accordance with the rolling end time of the subsequent steel material. The steel material can be rolled without the hot rolling mill 4 being empty, and, for example, a rolling efficiency 1.7 times that of the conventional rolling mill can be obtained.

なお、この実施形態においては、鋼材の待機装置として、鋼材を搬送テーブル上から後続の鋼材が通過できる高さに持ち上げて保持する保持装置を用いているが、本発明は、それに限定されることはなく、例えば、鋼材を搬送テーブル上から横方向に移動させて、後続の鋼材が通過できるようにする横移動式の待機装置を用いてもよい。本発明の待機装置として例に上げた、鋼材を搬送テーブル上から後続の鋼材が通過できる高さに持ち上げて保持する保持装置であれば、鋼材を搬送テーブル上から移動したり、鋼材を搬送テーブル上に戻したりするのが容易であり、応答性に富むので好ましい。   In this embodiment, a holding device that lifts and holds the steel material to a height at which the subsequent steel material can pass from the transfer table is used as the steel material standby device, but the present invention is limited thereto. Instead, for example, a lateral movement type standby device that moves the steel material laterally from the transfer table so that the subsequent steel material can pass may be used. As an example of the standby device of the present invention, if the holding device lifts and holds the steel material to a height at which the subsequent steel material can pass from the conveying table, the steel material is moved from the conveying table or the steel material is conveyed to the conveying table. It is preferable because it can be easily returned to the top and has high responsiveness.

また、この実施形態においては、圧延材が鋼材の場合を例にして説明したが、本発明は、それに限定されることはなく、圧延材がアルミニウム等の非鉄金属材料の場合にも適用することができる。   Further, in this embodiment, the case where the rolled material is a steel material has been described as an example. However, the present invention is not limited thereto, and the present invention is also applicable to a case where the rolled material is a non-ferrous metal material such as aluminum. Can do.

本発明の一実施形態に係る熱間圧延設備のレイアウトと、その熱間圧延設備を用いた鋼材の製造方法の手順を示す図である。It is a figure which shows the procedure of the manufacturing method of the steel materials using the layout of the hot rolling equipment which concerns on one Embodiment of this invention, and the hot rolling equipment. 本発明の一実施形態における保持装置の一例を示す図である。It is a figure which shows an example of the holding | maintenance apparatus in one Embodiment of this invention.

符号の説明Explanation of symbols

1 加熱炉
3 保持装置
4 可逆式熱間圧延機
5 温度計
10 鋼材
11 搬送テーブル
12 テーブルローラ
21 支柱
22 電動シリンダ
23 作動用モータ
31 横フレーム
32 縦フレーム
33 支持アーム
34 保持ローラ
35 モータ
36 ベルト
41 水冷装置
42 上ヘッダ
43 上ノズル
44 下ヘッダ
45 下ノズル
DESCRIPTION OF SYMBOLS 1 Heating furnace 3 Holding device 4 Reversible hot rolling mill 5 Thermometer 10 Steel material 11 Transfer table 12 Table roller 21 Post 22 Electric cylinder 23 Actuating motor 31 Horizontal frame 32 Vertical frame 33 Support arm 34 Holding roller 35 Motor 36 Belt 41 Water cooling device 42 Upper header 43 Upper nozzle 44 Lower header 45 Lower nozzle

Claims (2)

可逆式熱間圧延機の上流側に、温度計を有し、冷却待ちを要する圧延材を搬送テーブル上から上方に持ち上げて後続の圧延材が通過できる場所に待機させるための待機装置としての保持装置を備え、かつ該待機装置としての保持装置は待機中の前記冷却待ちを要する圧延材を冷却する水冷装置を有する熱間圧延設備を用いた鋼材の製造方法であって、
冷却待ちを要する鋼材を前記可逆式熱間圧延機で所定の板厚に圧延した後、該冷却待ちを要する鋼材を前記待機装置としての保持装置で後続の鋼材が通過できる場所に待機させ、後続の鋼材を前記可逆式熱間圧延機で圧延する一方で、待機中の前記冷却待ちを要する鋼材を所定温度になるように水冷した後、搬送テーブル上に戻し、前記後続の鋼材に引き続いて前記可逆式熱間圧延機で仕上圧延することを特徴とする鋼材の製造方法。
Upstream of the reversible hot rolling mill , it has a thermometer and holds it as a standby device for lifting the rolled material that needs to wait for cooling from the transfer table and waiting it in a place where the following rolled material can pass. And a holding device as the standby device is a method of manufacturing a steel material using a hot rolling facility having a water cooling device that cools the rolled material that needs to be cooled while waiting ,
After rolling the steel material that needs to be cooled to a predetermined thickness with the reversible hot rolling mill, the steel material that needs to be cooled is waited at a place where the subsequent steel material can pass through the holding device as the standby device, While rolling the steel material with the reversible hot rolling mill, the steel material that needs to be cooled while waiting is water-cooled so as to reach a predetermined temperature, and then returned to the transfer table, followed by the subsequent steel material. A method for producing a steel material, comprising finish rolling with a reversible hot rolling mill.
請求項1に記載の鋼材の製造方法に用いる熱間圧延設備であって、
可逆式熱間圧延機の上流側に、温度計を有し、冷却待ちを要する圧延材を搬送テーブル上から上方に持ち上げて後続の圧延材が通過できる場所に待機させるための待機装置としての保持装置を備え、かつ該待機装置としての保持装置は待機中の前記冷却待ちを要する圧延材を冷却する水冷装置を有することを特徴とする熱間圧延設備。
A hot rolling facility used in the method of manufacturing a steel material according to claim 1 ,
Upstream of the reversible hot rolling mill , it has a thermometer and holds it as a standby device for lifting the rolled material that needs to wait for cooling from the transfer table and waiting it in a place where the following rolled material can pass. equipped with a device, and the holding apparatus as該待machine apparatus hot rolling equipment characterized in that it comprises a water cooling device for cooling the rolled material requiring said cooling waiting waiting.
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