JP5119787B2 - Operation method of continuous annealing line - Google Patents

Operation method of continuous annealing line Download PDF

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JP5119787B2
JP5119787B2 JP2007197271A JP2007197271A JP5119787B2 JP 5119787 B2 JP5119787 B2 JP 5119787B2 JP 2007197271 A JP2007197271 A JP 2007197271A JP 2007197271 A JP2007197271 A JP 2007197271A JP 5119787 B2 JP5119787 B2 JP 5119787B2
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furnace
roll
steel plate
steel sheet
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JP2009030138A (en
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聡洋 佐々木
通 椎名
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JFE Steel Corp
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Description

本発明は、鋼板の連続焼鈍ラインにおけるライン運転方法及び連続焼鈍設備に関し、
特に鋼板の連続的な搬送の停止（ライン運転停止）後に鋼板の連続的な搬送（ライン運転）を再開して鋼板を連続焼鈍する際の鋼板の破断を防止するのに好適な連続焼鈍ラインの運転方法、及び、連続焼鈍設備に関する。 The present invention relates to a line operation method and continuous annealing equipment in a continuous annealing line for steel sheets,
In particular, the continuous annealing line suitable for preventing the steel sheet from being broken when the continuous conveyance (line operation) of the steel sheet is resumed after the continuous conveyance of the steel sheet is stopped (line operation stop). The present invention relates to an operation method and continuous annealing equipment.

冷延鋼板の連続焼鈍ラインの焼鈍炉の構成例を図１に示す。この連続焼鈍ラインでは、焼鈍炉２は竪型焼鈍炉で、加熱帯３、均熱帯４、及び冷却帯（第１冷却帯５、第２冷却帯６及び第３冷却帯７）を備え、焼鈍炉２の入側及び出側には、それぞれルーパ（図示なし）が設けられている。加熱帯３、均熱帯４には、バーナ加熱による輻射管（図示なし）が配置されている。焼鈍炉２内には、鋼板１を搬送するロール（炉内ロール）８が設けられ、鋼板１を安定通板するため、該ロール８の形状は、ロール両端部の直径より中央部の直径を大きくした、凸クラウン形状が採用されている。   A structural example of an annealing furnace of a continuous annealing line for cold-rolled steel sheets is shown in FIG. In this continuous annealing line, the annealing furnace 2 is a vertical annealing furnace, and includes a heating zone 3, a soaking zone 4, and a cooling zone (first cooling zone 5, second cooling zone 6 and third cooling zone 7), and annealing. Loopers (not shown) are respectively provided on the entrance side and the exit side of the furnace 2. In the heating zone 3 and the soaking zone 4, a radiant tube (not shown) by burner heating is arranged. In the annealing furnace 2, a roll (in-furnace roll) 8 for conveying the steel plate 1 is provided, and in order to stably feed the steel plate 1, the shape of the roll 8 has a diameter at the center portion than the diameter at both ends of the roll. Enlarged convex crown shape is adopted.

加熱帯３、均熱帯４からの輻射熱によってロール８のクラウン形状が影響を受けるのを防止するため、炉内の上部及び下部にロール室を設けて、該ロール室内にロール８を配置している。図２はロール室を説明する概略断面図で、加熱帯３の最前段の炉内ロール近傍のロール室を示す。ロール室９は、鋼板１を導入、導出する開口部を有する仕切り１０によって加熱帯３、均熱帯４からの輻射加熱が防止される。   In order to prevent the crown shape of the roll 8 from being affected by the radiant heat from the heating zone 3 and the soaking zone 4, roll chambers are provided in the upper and lower portions of the furnace, and the roll 8 is disposed in the roll chamber. . FIG. 2 is a schematic cross-sectional view illustrating the roll chamber, and shows the roll chamber in the vicinity of the in-furnace roll in the foremost stage of the heating zone 3. In the roll chamber 9, radiation heating from the heating zone 3 and the soaking zone 4 is prevented by a partition 10 having an opening through which the steel plate 1 is introduced and led out.

図１のラインでは、鋼板１は加熱帯３の下側から炉内に導入される。鋼板１は、焼鈍炉２内を連続的に搬送されて焼鈍されるが、焼鈍炉２の設備故障、焼鈍炉２上流又は下流の設備故障、作業トラブル等の設備・作業トラブル等によって、焼鈍炉２内の鋼板１の連続的な搬送を停止（ライン運転停止）する場合がある。ライン運転停止後、焼鈍炉２は降温、冷却される。   In the line of FIG. 1, the steel plate 1 is introduced into the furnace from the lower side of the heating zone 3. Although the steel plate 1 is continuously conveyed in the annealing furnace 2 and annealed, the annealing furnace 2 is subject to an equipment failure such as an equipment failure of the annealing furnace 2, an equipment failure upstream or downstream of the annealing furnace 2, and a work trouble, etc. 2 may stop the continuous conveyance of the steel plate 1 (line operation stop). After the line operation is stopped, the annealing furnace 2 is cooled and cooled.

ライン運転停止の原因になった問題が解消されると、次のようにして連続焼鈍ラインのライン運転（鋼板の連続的な搬送）が再開される。   When the problem causing the line operation stop is resolved, the line operation (continuous conveyance of the steel sheet) of the continuous annealing line is resumed as follows.

加熱帯３、均熱帯４の温度を、鋼板を再結晶させることができる温度、例えば５００〜７００℃以上の温度域に昇温した後、低速でライン運転を再開し、途中でライン停止させずに炉速を徐々に上昇して所定炉速とし、また炉速上昇に合わせて加熱帯３、均熱帯４の温度を鋼板温度が所定焼鈍温度となるように徐々に所定焼鈍炉温度に上昇する。   After raising the temperature of the heating zone 3 and the soaking zone 4 to a temperature at which the steel sheet can be recrystallized, for example, a temperature range of 500 to 700 ° C. or higher, the line operation is resumed at a low speed, and the line is not stopped halfway. The furnace speed is gradually increased to a predetermined furnace speed, and the temperature in the heating zone 3 and the soaking zone 4 is gradually increased to the predetermined annealing furnace temperature so that the steel plate temperature becomes the predetermined annealing temperature in accordance with the increase in the furnace speed. .

このライン運転の再開方法では、炉内での鋼板（単に板とも言う）が軟化してバックリング（座屈）が成長しやすく、それによって板破断してライン運転停止に至ることがある。   In this method of resuming line operation, a steel plate (also simply referred to as a plate) in the furnace is softened, and buckling (buckling) is likely to grow.

近年、連続焼鈍技術の普及に伴い、多様な用途に供される低炭素鋼板、極低炭素鋼板が連続焼鈍ラインにおいて製造されているが、これらの鋼板の薄物、広幅材では、ライン運転再開作業の過程でバックリングによる板破断が特に発生しやすい。   In recent years, with the spread of continuous annealing technology, low-carbon steel sheets and ultra-low carbon steel sheets used for various applications are manufactured in continuous annealing lines. During the process, the plate breakage due to buckling is particularly likely to occur.

特許文献１には、ライン運転停止（ライン停止とも言う）中、連続熱処理炉内のヘルパーロールを、正方向と逆方向へ少なくとも半回転させて、ライン停止中に発生するヘルパーロールの熱変形を防止することで、ライン停止後の運転再開時に発生するヒートバックル（バックリング）を防止することが記載されている。   In Patent Literature 1, during the line operation stop (also referred to as line stop), the helper roll in the continuous heat treatment furnace is rotated at least halfway in the forward direction and the reverse direction, and thermal deformation of the helper roll that occurs during the line stop is performed. It is described that preventing a heat buckle (buckling) that occurs when the operation is resumed after the line is stopped by preventing it.

しかし、特許文献１に記載の方法でも、低炭素鋼板、極低炭素鋼板でライン運転再開時に発生するバックリングによる板破断を確実に防止することができない。
特開平３−３１４２８号公報 However, even the method described in Patent Document 1 cannot reliably prevent plate breakage due to buckling that occurs when line operation is resumed with a low-carbon steel plate or an ultra-low-carbon steel plate.
JP-A-3-31428

本発明は、上記従来技術の問題点を考慮し、ライン運転停止状態にある連続焼鈍ラインでのライン運転を再開する際に、低炭素鋼板や極低炭素鋼板等のバックリングが発生しやすい鋼板で発生するバックリングに起因する板破断を防止できる連続焼鈍ラインの運転方法を提供することを課題とする。 In consideration of the above-mentioned problems of the prior art, the present invention is a steel plate in which buckling such as a low carbon steel plate or an ultra low carbon steel plate is likely to occur when line operation is resumed in a continuous annealing line in a line operation stop state. in providing driving how the continuous annealing line capable of preventing a strip breakage due to buckling which occurs an object.

上記課題を解決する本発明の手段は次のとおりである。   Means of the present invention for solving the above-mentioned problems are as follows.

（１）ライン運転停止状態にある鋼板の連続焼鈍ラインのライン運転を再開して鋼板を連続焼鈍する際に、加熱帯のロール室内の最前段の炉内ロールに巻き付いている鋼板を、巻き付いている鋼板面に対向させて配置した加熱手段で加熱して、該鋼板の生焼け部を再結晶させ、その後ライン運転を行い、鋼板を連続焼鈍することを特徴とする連続焼鈍ラインの運転方法。   (1) When resuming the line operation of the continuous annealing line of the steel sheet in the line operation stop state and continuously annealing the steel sheet, the steel sheet wound around the in-furnace roll in the foremost stage in the roll chamber of the heating zone is wound. A method of operating a continuous annealing line, characterized in that the steel plate is heated by a heating means arranged to face the surface of the steel plate, the raw burned portion of the steel plate is recrystallized, then the line operation is performed, and the steel plate is continuously annealed.

本発明によれば、ライン運転停止状態にある冷延鋼板の焼鈍ラインにおいて、低炭素鋼板や極低炭素鋼板等のバックリングが発生しやすい鋼板のライン運転を再開する際に発生するバックリングに起因するストリップ破断を防止することができる。   According to the present invention, in the annealing line of a cold-rolled steel sheet in a line operation stop state, the buckling that occurs when resuming the line operation of a steel sheet that tends to generate buckling such as a low-carbon steel sheet or an ultra-low carbon steel sheet. The resulting strip break can be prevented.

ライン運転再開の際に、鋼板温度が再結晶しない温度域でライン運転を行うと、炉内での板の軟化を防止できるため、バックリングの成長に対しては有利である。しかし、図１に示した連続焼鈍ラインにおいて、極低炭素鋼板でライン停止後に低温でライン運転を行うと、やはりバックリングによる板破断が発生する問題があった。   When the line operation is resumed when the line operation is performed in a temperature range where the steel sheet temperature does not recrystallize, the softening of the plate in the furnace can be prevented, which is advantageous for the growth of buckling. However, in the continuous annealing line shown in FIG. 1, when line operation is performed at a low temperature after the line is stopped with an ultra-low carbon steel plate, there is still a problem that the plate breaks due to buckling.

そこで、本発明者らは、連続焼鈍ラインでライン運転停止後のライン運転再開の際に、極低炭素鋼板で発生するバックリングによる板破断について詳細に調査・観察を行った。その結果、このバックリングの起点は、高速から停止したときに、鋼板１の加熱帯３最前段のロール８直上に停止した部分に発生した極微小な絞り（しわ状）であり、これがライン運転再開時に炉内を通板される間の高温＋ロール変形による張力変動により大きなバックリングへと成長するとともに、該部分が再結晶が完了されていない生焼け（未焼鈍）であることで、脆性破断に至ることが確認された。   Therefore, the present inventors have investigated and observed in detail the plate breakage due to buckling that occurs in the ultra-low carbon steel plate when the line operation is resumed after the line operation is stopped in the continuous annealing line. As a result, the starting point of this buckling is an extremely fine restriction (wrinkle shape) generated at the portion stopped immediately above the roll 8 at the foremost stage of the heating zone 3 of the steel plate 1 when stopped from a high speed. When it restarts, it grows into a large buckling due to high temperature while passing through the furnace + tension variation due to roll deformation, and this part is burnt (unannealed) where recrystallization has not been completed. To be confirmed.

ライン停止したときに鋼板１の加熱帯３最前段のロール直上部分にあった部分が生焼け（未焼鈍）になる理由は次のように考えられる。   The reason why the portion of the steel sheet 1 that was immediately above the roll in the foremost stage of the heating zone 3 becomes burnt (unannealed) is considered as follows.

図１に示した連続焼鈍ラインにおいて、冷間圧延された鋼板１は、焼鈍炉２に通板され、加熱帯３及び均熱帯４で所定温度で加熱焼鈍された後、冷却帯５〜７で冷却される。加熱帯３は、ほぼ常温の鋼板を再結晶温度以上の温度域に昇温するため、加熱帯３の入口に近い部分では、鋼板１には再結晶完了前の生焼け部分が存在する。   In the continuous annealing line shown in FIG. 1, the cold-rolled steel sheet 1 is passed through an annealing furnace 2 and heated and annealed at a predetermined temperature in a heating zone 3 and a soaking zone 4, and then in cooling zones 5 to 7. To be cooled. Since the heating zone 3 raises the temperature of the steel sheet having a substantially normal temperature to a temperature range equal to or higher than the recrystallization temperature, in the portion near the entrance of the heating zone 3, the steel plate 1 has an unburned portion before completion of recrystallization.

ライン停止すると、焼鈍炉加熱バーナを消火するが、ライン停止直後、加熱帯３内は高温であるため、加熱帯３の温度が鋼板が再結晶しない温度域に低下するまでの間に、加熱帯３前段の炉内にあった鋼板（図２の鋼板１ａ及び１ｃ）は再結晶温度以上の温度域に加熱されて、生焼け部分は再結晶する。一方、ロール室９は、加熱帯３に比べて温度が低く、加熱帯３からの輻射加熱も少ない。ライン停止時に焼鈍炉の入口に最も近い加熱帯３の最前段の炉内ロール近傍のロール室９内にあった鋼板（図２の鋼板１ｂ）の温度は再結晶温度以上の温度域まで加熱されることがないため、ライン停止後も生焼けのままであるとともに該最前段のロール８直上に停止した部分には極微小な絞り（しわ状）が発生している。   When the line is stopped, the annealing furnace heating burner is extinguished. Immediately after the line is stopped, the heating zone 3 is at a high temperature, and therefore the heating zone 3 is heated until the temperature of the heating zone 3 falls to a temperature range where the steel sheet does not recrystallize. 3 The steel plates (steel plates 1a and 1c in FIG. 2) in the former stage furnace are heated to a temperature range equal to or higher than the recrystallization temperature, and the burnt portion is recrystallized. On the other hand, the temperature of the roll chamber 9 is lower than that of the heating zone 3, and there is little radiation heating from the heating zone 3. When the line is stopped, the temperature of the steel plate (steel plate 1b in FIG. 2) in the roll chamber 9 near the in-furnace roll in the foremost stage of the heating zone 3 closest to the inlet of the annealing furnace is heated to a temperature range above the recrystallization temperature. Therefore, even after the line is stopped, it is still burnt, and a very small aperture (wrinkle shape) is generated at the portion stopped just above the foremost roll 8.

鋼板長手方向では、軟質の焼鈍板１ａ及び１ｃに局部的に硬質の未焼鈍板１ｂが接続された状態の特異な構造となっており、この特異な構造がライン運転再開時に板破断を発生させると考えられた。しかも、極低炭素鋼板は、低炭素鋼板に比べて、再結晶温度が高く、また焼鈍後は軟質であるため、バックリングがより発生しやすい。   In the longitudinal direction of the steel sheet, it has a unique structure in which a hard unannealed plate 1b is locally connected to the soft annealed plates 1a and 1c, and this unique structure causes plate breakage when line operation resumes. It was considered. In addition, since the ultra-low carbon steel plate has a higher recrystallization temperature and is soft after annealing, buckling is more likely to occur.

以上から、ライン停止時にロール室内にあった鋼板のうちで最前段の炉内ロール近傍の生焼け部分１ｂを再結晶させて前述の特異な構造をなくした上で、ライン運転を再開すれば、バックリングによる板破断を防止できると考えた。本発明は、この知見に基づきなされたものである。   From the above, when the line operation is resumed after re-crystallizing the raw burned portion 1b near the in-furnace roll among the steel sheets that were in the roll chamber when the line was stopped, the line operation was resumed. It was thought that plate breakage due to the ring could be prevented. The present invention has been made based on this finding.

以下、本発明の実施の形態について詳しく説明する。   Hereinafter, embodiments of the present invention will be described in detail.

図３は、本発明の実施の形態に係る連続焼鈍設備のロール室の要部構成を示す概略断面図である。加熱帯３のロール室９の最前段の炉内ロール８の直上に、ロール８に巻きついている鋼板１を加熱するヒータ（加熱手段）１１が、ロール８に巻き付いている鋼板面に近接して対向配置されている。ヒータ１１は公知のものを使用できる。本実施の形態では、ヒータ１１は、電熱式チューブヒータで構成されている。本発明法では、このヒータ１１を用いて、ライン停止時にロール室内にあった鋼板の生焼け部分を加熱、再結晶させる。   FIG. 3 is a schematic cross-sectional view showing the main configuration of the roll chamber of the continuous annealing facility according to the embodiment of the present invention. A heater (heating means) 11 that heats the steel sheet 1 wound around the roll 8 is located immediately above the in-furnace roll 8 in the foremost stage of the roll chamber 9 of the heating zone 3 in proximity to the steel sheet surface that is wound around the roll 8. Opposed. A known heater 11 can be used. In the present embodiment, the heater 11 is composed of an electrothermal tube heater. In the method of the present invention, this heater 11 is used to heat and recrystallize the burnt portion of the steel sheet that was in the roll chamber when the line was stopped.

具体的には、バックリングの問題がある鋼板について、以下の手順でライン停止後のライン運転再開を行う。なお、以下の説明は、図１の連続焼鈍ラインを念頭において、説明する。加熱帯３は３ゾーンあり、各ゾーン毎の炉温制御が可能である。   Specifically, for a steel plate having a buckling problem, the line operation is resumed after the line is stopped by the following procedure. The following description will be made with the continuous annealing line in FIG. 1 in mind. The heating zone 3 has three zones, and furnace temperature control for each zone is possible.

（１）ライン停止状態で、ヒータ１１を運転し、加熱帯３のロール室９内の最前段の炉内ロール８直上にある鋼板を加熱し、生焼け部を再結晶させる。再結晶温度は鋼成分組成によって異なるのでヒータの設定温度を鋼成分に応じて変えることが好ましい。   (1) With the line stopped, the heater 11 is operated to heat the steel plate immediately above the foremost furnace roll 8 in the roll chamber 9 of the heating zone 3 and recrystallize the burned portion. Since the recrystallization temperature varies depending on the steel component composition, it is preferable to change the set temperature of the heater according to the steel component.

ここで、例えば低炭素鋼板の加熱温度は６００〜７００℃程度、極低炭素鋼板では７５０〜７８０℃程度とすることが好ましい。ただし、低炭素鋼板はＣ含有量が０．０１〜０．１質量％程度、極低炭素鋼板はＣ含有量が０．００５質量％以下程度の鋼板である。再結晶させたら、ヒータ１１の運転を停止する。   Here, for example, the heating temperature of the low carbon steel plate is preferably about 600 to 700 ° C., and the extremely low carbon steel plate is preferably about 750 to 780 ° C. However, the low carbon steel plate is a steel plate having a C content of about 0.01 to 0.1% by mass, and the extremely low carbon steel plate is a steel plate having a C content of about 0.005% by mass or less. After recrystallization, the operation of the heater 11 is stopped.

次にライン運転を開始し炉速と焼鈍炉温度を所定炉速と所定焼鈍炉温度に移行させて鋼板を連続焼鈍する。ここで、所定炉速、所定焼鈍温度とは、鋼板を連続焼鈍するために適宜設定されるものである。生焼け部分にあった特異な構造をなくした上でライン運転を行うので、ライン運転再開時のバックリングによる板破断を防止できる。   Next, the line operation is started, the furnace speed and the annealing furnace temperature are shifted to the predetermined furnace speed and the predetermined annealing furnace temperature, and the steel sheet is continuously annealed. Here, the predetermined furnace speed and the predetermined annealing temperature are appropriately set in order to continuously anneal the steel sheet. Since the line operation is performed after eliminating the peculiar structure in the burnt portion, it is possible to prevent the plate from being broken due to buckling when the line operation is resumed.

なお、加熱帯３及び均熱帯４の炉温は６００℃以下の低温となってからライン運転を開始することが好ましい。   In addition, it is preferable to start a line operation after the furnace temperature of the heating zone 3 and the soaking zone 4 becomes low temperature of 600 degrees C or less.

また、炉速は、低速、例えば１０ｍｐｍ程度とし、バックリング程度を観察しながら、炉速を所定の設定速度へ近づけるように適宜速度に増速し、また加熱帯３及び均熱帯４の炉温を板温が所定板温になるように制御する。   Further, the furnace speed is set to a low speed, for example, about 10 mpm, the furnace speed is appropriately increased so as to approach the predetermined set speed while observing the buckling degree, and the furnace temperature in the heating zone 3 and the soaking zone 4 is also increased. Is controlled so that the plate temperature becomes a predetermined plate temperature.

バックリングが発生しやすい極低炭素鋼板や低炭素鋼板等の鋼板に対して、ライン停止後のライン運転再開を上述の方法で行うことによって、ライン運転再開時に発生するバックリングに起因するストリップ破断を顕著に低減することができる。   Strip breakage due to buckling that occurs when line operation is resumed by performing line operation resumption after line stop for steel plates such as ultra-low carbon steel plates and low carbon steel plates that are prone to buckling. Can be significantly reduced.

冷延鋼板の連続焼鈍ラインにおいて、板厚０．２５ｍｍ未満の鋼板に対して、本発明の手段（１）の方法でライン運転を行ったところ、バックリングに起因するストリップ破断件数は、従来法では４．５回／年であったものが０．５回／年に減少した。   In a continuous annealing line for cold-rolled steel sheets, line operation was performed on the steel sheet having a thickness of less than 0.25 mm by the method of the means (1) of the present invention. Then, it decreased from 4.5 times / year to 0.5 times / year.

本発明の方法は、ライン停止状態にある連続焼鈍ラインのライン運転を再開する際に、低炭素鋼板や極低炭素鋼板等のバックリングが発生しやすい鋼板で発生するバックリングに起因する板破断を防止する方法として利用することができる。 In the method of the present invention, when the line operation of a continuous annealing line in a line stop state is resumed, plate breakage caused by buckling that occurs in a steel plate that is likely to generate buckling such as a low-carbon steel plate or an ultra-low carbon steel plate. It can be used as a method for preventing this .

冷延鋼板の連続焼鈍ラインの焼鈍炉の構成例を示す概略図であるIt is the schematic which shows the structural example of the annealing furnace of the continuous annealing line of a cold-rolled steel plate. 焼鈍炉のロール室を示す概略断面図である。It is a schematic sectional drawing which shows the roll chamber of an annealing furnace. 本発明の実施の形態にかかる連続焼鈍設備のロール室の要部を示す概略断面図である。It is a schematic sectional drawing which shows the principal part of the roll chamber of the continuous annealing equipment concerning embodiment of this invention.

符号の説明Explanation of symbols

１ 鋼板
２ 焼鈍炉
３ 加熱帯
４ 均熱帯
５ 第１冷却帯
６ 第２冷却帯
７ 第３冷却帯
８ ロール（炉内ロール）
９ ロール室
１０ 仕切り
１１ ヒータ（加熱手段） 1 Steel plate 2 Annealing furnace 3 Heating zone 4 Soaking zone 5 First cooling zone 6 Second cooling zone 7 Third cooling zone 8 Roll (roll in the furnace)
9 Roll chamber 10 Partition 11 Heater (heating means)

Claims (1)

ライン運転停止状態にある鋼板の連続焼鈍ラインのライン運転を再開して鋼板を連続焼鈍する際に、加熱帯のロール室内の最前段の炉内ロールに巻き付いている鋼板を、巻き付いている鋼板面に対向させて配置した加熱手段で加熱して、該鋼板の生焼け部を再結晶させ、その後ライン運転を行い、鋼板を連続焼鈍することを特徴とする連続焼鈍ラインの運転方法。 When the line operation of the continuous annealing line of the steel sheet in the line operation stop state is resumed and the steel sheet is continuously annealed, the steel sheet wound around the foremost roll in the heating chamber roll chamber, A continuous annealing line operating method, characterized in that the steel plate is heated by a heating means arranged opposite to the steel plate, the raw burned portion of the steel sheet is recrystallized, then the line operation is performed, and the steel sheet is continuously annealed.
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