JP2005232482A - Method for continuously heat-treating hot-rolled steel plate - Google Patents

Method for continuously heat-treating hot-rolled steel plate Download PDF

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JP2005232482A
JP2005232482A JP2004039626A JP2004039626A JP2005232482A JP 2005232482 A JP2005232482 A JP 2005232482A JP 2004039626 A JP2004039626 A JP 2004039626A JP 2004039626 A JP2004039626 A JP 2004039626A JP 2005232482 A JP2005232482 A JP 2005232482A
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steel strip
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heat treatment
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hot rolling
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Tetsuo Nishida
哲郎 西田
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JFE Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for continuously heat-treating a hot-rolled steel plate, which controls a pate temperature more precisely than ever. <P>SOLUTION: This continuous heat treatment method is a technology that has improved the same method of connecting a steel strip in a preceding coil to a steel strip in the following coil, which have the same plate thicknesses in a specification after having been hot-rolled, and continuously passing them through a heat treatment apparatus which controls an atmospheric temperature to a predetermined one, specifically by connecting the head of the preceding steel strip in a hot rolling direction to the head of the following steel strip in the hot rolling direction, or connecting the end of the preceding steel strip in the hot rolling direction to the end of the following steel strip in the hot rolling direction; and further specifically, by preparing a forwardly wound coil which has wound up the steel strip in the hot rolling direction and a reversely wound coil which has rewound the steel strip so as to reverse the top to the end in the rolling direction, sequentially alternately connecting the steel strip from each coil, and heat-treating them. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、熱延鋼帯の連続熱処理方法に係わり、特に、先行コイルの鋼帯後端と後行コイルの鋼帯先端との接合点が連続熱処理装置の加熱帯を通過する際でも、板温の制御が安定して行える熱延鋼帯の熱処理技術に関する。   The present invention relates to a method for continuous heat treatment of a hot-rolled steel strip, and in particular, even when the junction point between the steel strip rear end of the preceding coil and the steel strip front end of the subsequent coil passes through the heating zone of the continuous heat treatment apparatus. The present invention relates to a heat treatment technology for a hot-rolled steel strip that can stably control the temperature.

熱延鋼帯の熱処理の一つに、熱間圧延で製造した鋼帯をコイル状に巻き取った後、そのコイル（１本は１０トン程度）をアンコイラーで巻き戻し、先行コイルの鋼帯後端と後行コイルの鋼帯先端とを順次溶接で接合して連続的に熱処理装置内を走行させる方法がある。例えば、熱処理として焼鈍を行う場合には、図３に示すような連続焼鈍装置が利用される。それは、図示していないラジアントチューブを間接加熱源として多数配設した炉４内を、加熱帯５、均熱帯６、冷却帯７のゾーンに分割し、各ゾーンを通過する鋼帯１を所定の温度に保持し、該鋼帯１に一定の熱サイクルを与えるものである。   One of the heat treatments for hot-rolled steel strip is to wind a steel strip manufactured by hot rolling into a coil shape, and then unwind the coil (about 10 tons) with an uncoiler. There is a method in which the end and the steel strip tip of the succeeding coil are sequentially welded to run in the heat treatment apparatus. For example, when annealing is performed as a heat treatment, a continuous annealing apparatus as shown in FIG. 3 is used. The furnace 4 in which a large number of radiant tubes (not shown) are arranged as indirect heating sources is divided into heating zones 5, soaking zones 6 and cooling zones 7, and the steel strip 1 passing through each zone is set to a predetermined range. The temperature is maintained and a constant thermal cycle is given to the steel strip 1.

ところが、熱処理するコイル状鋼帯の鋼種、板厚、板幅は種々異なるので、処理対象のコイルに応じて各ゾーンの雰囲気温度は変更する必要がある。また、コイル状鋼帯の鋼種、板厚、板幅が同一規格であっても、鋼帯の長手方向でそれぞれにバラツキがある。従って、炉内を通過する鋼帯を所定温度に保持するため、前記各ゾーンで温度制御を厳密に行なっている。   However, since the steel type, plate thickness, and plate width of the coiled steel strip to be heat-treated are different, it is necessary to change the ambient temperature of each zone according to the coil to be processed. Moreover, even if the steel type, plate thickness, and plate width of the coiled steel strip are the same standard, there are variations in the longitudinal direction of the steel strip. Therefore, in order to keep the steel strip passing through the furnace at a predetermined temperature, temperature control is strictly performed in each zone.

例えば、鋼板に所定の熱サイクルを与える連続熱処理炉において、板厚、板温等の熱負荷が変化する時には、所定のタイミングで伝熱式に基づき加熱条件の設定替えをするフィードフォワード制御を行い、所定時間経過後は前記加熱条件設定値を初期値として板温偏差に応じて加熱条件を修正するフィードバック制御を行う板温制御方法が提案されている（特許文献１参照）。また、炉内に配設されたラジアントチューブ内の燃料流量を調節して、ストリップ（鋼帯）の温度を制御する連続焼鈍炉の鋼帯温度制御方法において、焼鈍条件変更時に、加熱帯の各ゾーンを通板中の先行板の現在炉温と後行板の目標設定炉温から変更すべき炉温差を求め、該炉温差に対応する燃料流量差を求め、該燃料差を最小時間で達成すべく、一時的に最大燃料流量で最大燃焼すべき時間又は最小燃料流量で最小燃焼すべき時間を求め、後行板の負荷の方が先行板の負荷よりも高い時は、帯の板変更点が加熱帯の入口を通過する前に、前記最大燃焼すべき時間だけ最大燃焼させ、一方、後行板の負荷の方が先行板の負荷よりも低い時は、帯の板変更点が加熱帯を通過した直後から、前記最小燃焼すべき時間だけ最小燃焼させる連続焼鈍炉の鋼帯温度制御方法も開示されている。そして、これらの先行技術により、目標板温への制御がかなり高い精度で行えるようになった。しかしながら、その制御には、まだ十分に満足できない結果も生じることもある。そこで、鋼帯の変更位置前後での板温制御の精度を高めるために、板厚が同一規格のコイル、すなわち熱間圧延後の目標板厚が同一のコイルを順次接合して熱処理装置内を通過させ、板厚変化による熱負荷の変化を回避することを試みたが、いまだ十分な結果が得られていない。
特開平６−４９５４６号公報 特開昭６１−１１３７２８号公報 For example, in a continuous heat treatment furnace that gives a predetermined heat cycle to a steel plate, when the heat load such as the plate thickness and the plate temperature changes, feed forward control is performed to change the heating condition based on the heat transfer equation at a predetermined timing. In addition, a plate temperature control method has been proposed in which after a predetermined time has elapsed, feedback control for correcting the heating condition according to the plate temperature deviation is performed using the heating condition set value as an initial value (see Patent Document 1). Moreover, in the steel strip temperature control method for a continuous annealing furnace in which the temperature of the strip (steel strip) is controlled by adjusting the fuel flow rate in the radiant tube disposed in the furnace, Find the furnace temperature difference to be changed from the current furnace temperature of the preceding board in the zone passing plate and the target set furnace temperature of the succeeding board, find the fuel flow difference corresponding to the furnace temperature difference, and achieve the fuel difference in the minimum time Therefore, temporarily find the time to burn at the maximum fuel flow or the time to burn at the minimum fuel flow, and if the load on the trailing plate is higher than the load on the preceding plate, change the strip plate. Before the point passes through the inlet of the heating zone, the maximum combustion is performed for the maximum time to be burned. On the other hand, when the load on the trailing plate is lower than the load on the preceding plate, the plate change point of the strip is Immediately after passing through the tropics, continuous annealing is performed for minimum combustion for the minimum combustion time. Strip temperature control method of is also disclosed. With these prior arts, control to the target plate temperature can be performed with considerably high accuracy. However, the control may still have unsatisfactory results. Therefore, in order to increase the accuracy of sheet temperature control before and after the steel strip change position, coils with the same standard thickness, i.e., coils with the same target thickness after hot rolling, are sequentially joined in the heat treatment apparatus. Attempts were made to pass through and avoid changes in the thermal load due to changes in plate thickness, but sufficient results have not yet been obtained.
Japanese Patent Laid-Open No. 6-49546 JP-A-61-113728

本発明は、かかる事情に鑑み、従来より精度の高い板温制御が可能な熱延鋼帯の連続熱処理方法を提供することを目的としている。   In view of such circumstances, an object of the present invention is to provide a continuous heat treatment method for a hot-rolled steel strip capable of controlling the plate temperature with higher accuracy than before.

発明者は、かかる事情に鑑み、従来の連続熱処理方法を見直し、その成果を本発明に具現化した。   In view of such circumstances, the inventor has reviewed the conventional continuous heat treatment method and embodied the result in the present invention.

すなわち、本発明は、熱間圧延で製造した板厚が同一規格である先行する鋼帯と後行する鋼帯とを接合し、雰囲気温度を所定温度に制御している熱処理装置を連続的に通過させる熱延鋼帯の連続熱処理方法において、先行する鋼帯の熱間圧延方向先端と後行する鋼帯の熱間圧延方向先端とを接合するか、又は先行する鋼帯の熱間圧延方向後端と後行する鋼帯の熱間圧延方向後端とを接合することを特徴とする熱延鋼帯の連続熱処理方法である。   That is, the present invention continuously joins a preceding steel strip having the same thickness and a subsequent steel strip manufactured by hot rolling and continuously controls the atmospheric temperature to a predetermined temperature. In the continuous heat treatment method of the hot-rolled steel strip to be passed, the hot rolling direction tip of the preceding steel strip and the hot rolling direction tip of the subsequent steel strip are joined or the hot rolling direction of the preceding steel strip A continuous heat treatment method for a hot-rolled steel strip, characterized in that a rear end and a rear end in the hot rolling direction of a subsequent steel strip are joined.

また、本発明は、熱間圧延で製造した板厚が同一規格である先行する鋼帯と後行する鋼帯とを接合し、雰囲気温度を所定温度に制御している熱処理装置を連続的に通過させる熱延鋼帯の連続熱処理方法において、前記熱間圧延の圧延方向に沿って鋼帯を巻き取った正巻きコイルと、該圧延方向に関して鋼帯の先後端を逆にして再度巻き直した逆巻きコイルとを準備し、それぞれのコイルからの鋼帯を交互に順次接合していくことを特徴とする熱延鋼帯の連続熱処理方法である。   The present invention also provides a continuous heat treatment apparatus that joins a preceding steel strip and a subsequent steel strip manufactured by hot rolling to the same standard and controls the ambient temperature to a predetermined temperature. In the continuous heat treatment method of the hot-rolled steel strip to be passed, the normal winding coil that has wound the steel strip along the rolling direction of the hot rolling, and the rewinding with the front and rear ends of the steel strip reversed in the rolling direction This is a continuous heat treatment method for hot-rolled steel strips, characterized in that reverse-wound coils are prepared and steel strips from the respective coils are alternately and sequentially joined.

さらに、これらの方法は、前記鋼帯の鋼種及び板幅が同一規格であったり、あるいは前記熱処理が焼鈍である場合に好ましく適用できる。   Furthermore, these methods can be preferably applied when the steel type and plate width of the steel strip are the same standard, or when the heat treatment is annealing.

本発明では、板厚が同一規格の熱延鋼帯のコイルを製造毎に１本おきに先後端が逆になるように巻き直してから順次接合し、熱処理装置に通板するようにしたので、接合部での急峻な板厚変動が解消され、板温制御が円滑に行われるようになる。特に、その効果は、同一規格の鋼種，板厚及び板幅の鋼帯を熱処理する際に有効である。   In the present invention, the coil of the hot-rolled steel strip having the same standard thickness is re-rolled every other production so that the leading and trailing ends are reversed, and then sequentially joined, and then passed through the heat treatment apparatus. As a result, steep plate thickness fluctuations at the joints are eliminated, and plate temperature control is performed smoothly. In particular, the effect is effective when heat treating steel strips of the same standard steel type, thickness and width.

以下、発明をなすに至った経緯をまじえ、本発明の最良の実施形態を説明する。   Hereinafter, the best embodiment of the present invention will be described based on the background of the invention.

まず、発明者は、従来の熱処理方法において板温制御が安定しない原因を追求した。その結果、コイル変更により鋼帯１を接合する時に、図２に板断面で模式的に示すように、先行コイルの鋼帯後端と後行コイルの鋼帯先端との接合（溶接）部に段差２が生じていることを見出した。この段差２は、熱間圧延で鋼帯を製造する際、圧延方向に沿ってその先端の肉厚が後端より薄くなることに起因している（例えば、目標肉厚２．２ｍｍの鋼帯で先後端の差（Δｔ）が０．１ｍｍ程度ある）。この程度の段差は、製品の板厚としては許容範囲にあるので、熱処理においては、まったく配慮されていなかった。   First, the inventor sought the cause of unstable plate temperature control in the conventional heat treatment method. As a result, when the steel strip 1 is joined by changing the coil, as shown schematically in FIG. 2 in the cross section of the plate, the joining (welding) portion between the steel strip rear end of the preceding coil and the steel strip front end of the succeeding coil It was found that a step 2 occurred. This level difference 2 is due to the fact that when manufacturing a steel strip by hot rolling, the thickness at the front end becomes thinner than the rear end along the rolling direction (for example, a steel strip having a target thickness of 2.2 mm). And the difference (Δt) between the front and rear ends is about 0.1 mm). Such a level difference is within an allowable range as the thickness of the product, so that no consideration was given to the heat treatment.

しかしながら、発明者は、熱処理における板温制御にとってこの現象を非常に重要とみた。そのような板厚の急変は、板温制御における応答性に影響が大きいと考えたのである。つまり、従来の板厚フィードフォワード制御では、急峻な板厚変動で加熱炉の燃料流量を調整しても、その応答が遅く、板温制御の精度を改善することはできないと予想した。   However, the inventor regarded this phenomenon as very important for the plate temperature control in the heat treatment. It was thought that such a sudden change in the plate thickness had a great influence on the responsiveness in the plate temperature control. In other words, in the conventional plate thickness feedforward control, even if the fuel flow rate of the heating furnace was adjusted with a steep plate thickness variation, the response was slow, and the accuracy of the plate temperature control could not be improved.

そこで、本発明者は、この段差２を解消するには、図１に板断面で模式的に示すような接合部にすれば良いと考えた。接合部での板厚の変化が滑らかになるからである。すなわち、先行する鋼帯の熱間圧延方向先端と後行する鋼帯の熱間圧延方向先端とを接合するか、又は先行する鋼帯の熱間圧延方向後端と後行する鋼帯の熱間圧延方向後端とを、接合前に向きを変えてから接合する。具体的には、熱間圧延で製造した鋼帯１の熱間圧延方向先端と後端とを通常とは逆にして巻き取ったもの（逆巻きコイルという）を準備する。この準備は、オフラインに巻き直し機が一式あれば可能である。そして、通常の熱間圧延で巻き取ったコイル（正巻きコイルという）と、上記逆巻きコイルの二種類のコイルを交互に巻き戻し、連続して接合して熱処理を試行したところ、従来より非常に良好な板温制御が実施できたので、このような接合部にすることを要件に本発明を完成させたのである。   In view of this, the present inventor has considered that in order to eliminate the step 2, a joining portion as schematically shown in FIG. This is because the change in the plate thickness at the joint becomes smooth. That is, the leading end in the hot rolling direction of the preceding steel strip and the leading end in the hot rolling direction of the following steel strip are joined, or the trailing end of the preceding steel strip in the hot rolling direction and the heat of the following steel strip The rear end of the intermediate rolling direction is joined after the direction is changed before joining. Specifically, a steel strip 1 manufactured by hot rolling is prepared by winding up the front end and the rear end in the hot rolling direction opposite to the normal one (referred to as a reverse winding coil). This preparation is possible if you have a set of rewinding machines offline. And when the coil wound up by normal hot rolling (referred to as a forward winding coil) and the two types of the above-mentioned reverse winding coil were rewound alternately and joined together and tried to heat treatment, Since good plate temperature control could be carried out, the present invention was completed on the requirement that such a joint be used.

熱間圧延工程で、板厚２．２ｍｍ×板幅１００ｍｍの炭素鋼帯を製造し、コイル状に巻き取った。コイル１個分の鋼帯長さは、５００ｍである。このコイルを図３に示したような連続焼鈍装置に順次供給して焼鈍したが、その際に本発明に係る熱処理方法を適用した。つまり、オフラインに設けた一対のアンコイラー及びコイラーを利用して、製造したコイルの半数を鋼帯の先後端が逆になるように巻き直し、前記逆巻きコイルとした。そして、連続焼鈍装置のラインに、巻き直しを行わなかった前記正巻きコイルと前記逆巻きコイルとを交互に接合して供給した。なお、この場合の板温制御方法としては、前記特許文献１記載の技術を採用している。また、加熱帯５内及び均熱帯６内の目標雰囲気温度は、それぞれ１１００℃及び１０２０℃で、冷却帯の温度は、２００〜３００℃の範囲で順次低下させている。   In the hot rolling process, a carbon steel strip having a plate thickness of 2.2 mm and a plate width of 100 mm was produced and wound into a coil. The length of the steel strip for one coil is 500 m. The coils were sequentially supplied to a continuous annealing apparatus as shown in FIG. 3 and annealed. At that time, the heat treatment method according to the present invention was applied. That is, using a pair of uncoilers and coilers provided off-line, half of the manufactured coils were rewound so that the front and rear ends of the steel strips were reversed to form the reverse-wound coil. And the said normal winding coil and the said reverse winding coil which were not rewinded were joined and supplied to the line of the continuous annealing apparatus alternately. In this case, as the plate temperature control method, the technique described in Patent Document 1 is adopted. Moreover, the target atmospheric temperatures in the heating zone 5 and the soaking zone 6 are 1100 ° C. and 1020 ° C., respectively, and the temperature in the cooling zone is sequentially reduced in the range of 200 to 300 ° C.

本発明を適用した場合の加熱帯５における板温制御の状況例を、横軸に鋼帯長さ（又は時間）、縦軸に温度偏差（板温及び炉温のそれぞれについて、目標温度と実際の温度との差）を用いて、図４に示す。また、比較のため、本発明を適用しない連続焼鈍も行ったが、その場合の板温制御の状況例を同様に図５に示す。さらに、板温の測定には、非接触式放射温度計を利用している。   Example of plate temperature control in the heating zone 5 when the present invention is applied, the horizontal axis indicates the steel strip length (or time), and the vertical axis indicates the temperature deviation (the target temperature and the actual temperature for each of the plate temperature and the furnace temperature). 4 is shown in FIG. For comparison, continuous annealing without applying the present invention was also performed. FIG. 5 shows an example of the plate temperature control in that case. Furthermore, a non-contact type radiation thermometer is used for measuring the plate temperature.

図４及び図５より、従来は接合部（溶接位置）付近で板温偏差が±１０℃を超える板温制御しかできなかったが、本発明を適用すれば、確実に±１０℃で制御できることが明らかである。その結果、本発明を適用した場合の焼鈍材の長手方向における特性（引張り強度、歪等）のバラツキが低減し、製品品質が従来より格段に向上した。   4 and 5, conventionally, only the plate temperature control in which the plate temperature deviation exceeds ± 10 ° C. was possible in the vicinity of the joint (welding position). However, if the present invention is applied, it can be reliably controlled at ± 10 ° C. Is clear. As a result, variation in the characteristics (tensile strength, strain, etc.) in the longitudinal direction of the annealed material when the present invention was applied was reduced, and the product quality was significantly improved as compared with the prior art.

なお、上記実施例は、同一規格の鋼種，板厚及び板幅のコイル状鋼帯を接合した場合であるが、本発明は、板厚が同じであれば、鋼種及び板幅の規格が異なるコイル状鋼帯同士を接合する場合に適用しても良い。そのような場合にも、板温制御の精度が向上するからである。また、本発明でいう熱処理方法としては、必ずしも「焼鈍」に限らない。「焼準」に利用しても良い。   In addition, although the said Example is a case where the coiled steel strip of the same specification steel grade, board thickness, and board width is joined, if the board thickness is the same, the standard of steel grade and board width will differ. You may apply when joining coiled steel strips. This is because the accuracy of the plate temperature control is improved also in such a case. Further, the heat treatment method in the present invention is not necessarily limited to “annealing”. It may be used for “normalization”.

本発明に係る鋼帯の連続熱処理における鋼帯の接合状態を模式的に示す断面図である。It is sectional drawing which shows typically the joining state of the steel strip in the continuous heat processing of the steel strip which concerns on this invention. 従来の鋼帯の連続熱処理における鋼帯の接合状態を模式的に示す断面図である。It is sectional drawing which shows typically the joining state of the steel strip in the continuous heat processing of the conventional steel strip. 一般的な鋼帯の連続焼鈍装置を示す縦断面図である。It is a longitudinal cross-sectional view which shows the continuous annealing apparatus of a general steel strip. 本発明に係る鋼帯の連続焼鈍方法を適用した場合の板温制御状況を示す図である。It is a figure which shows the board temperature control condition at the time of applying the continuous annealing method of the steel strip which concerns on this invention. 従来の鋼帯の連続焼鈍方法における板温制御状況を示す図であるである。It is a figure which shows the board temperature control condition in the conventional continuous annealing method of a steel strip.

符号の説明Explanation of symbols

１ 鋼帯
２ 段差
３ ローラ
４ 炉
５ 加熱帯
６ 均熱帯
７ 冷却帯 1 Steel strip 2 Step 3 Roller 4 Furnace 5 Heating zone 6 Soaking zone 7 Cooling zone

Claims (4)

熱間圧延で製造した板厚が同一規格である先行する鋼帯と後行する鋼帯とを接合し、雰囲気温度を所定温度に制御している熱処理装置を連続的に通過させる熱延鋼帯の連続熱処理方法において、先行する鋼帯の熱間圧延方向先端と後行する鋼帯の熱間圧延方向先端とを接合するか、又は先行する鋼帯の熱間圧延方向後端と後行する鋼帯の熱間圧延方向後端とを接合することを特徴とする熱延鋼帯の連続熱処理方法。 A hot-rolled steel strip that joins a preceding steel strip with the same thickness and a subsequent steel strip manufactured by hot rolling and continuously passes through a heat treatment device that controls the ambient temperature to a predetermined temperature. In the continuous heat treatment method, the leading end in the hot rolling direction of the preceding steel strip and the leading end in the hot rolling direction of the following steel strip are joined, or the trailing end in the hot rolling direction of the preceding steel strip is followed. A method for continuous heat treatment of a hot-rolled steel strip, characterized by joining a rear end in a hot rolling direction of the steel strip. 熱間圧延で製造した板厚が同一規格である先行する鋼帯と後行する鋼帯とを接合し、雰囲気温度を所定温度に制御している熱処理装置を連続的に通過させる熱延鋼帯の連続熱処理方法において、
前記熱間圧延の圧延方向に沿って鋼帯を巻き取った正巻きコイルと、該圧延方向に関して鋼帯の先後端を逆にして再度巻き直した逆巻きコイルとを準備し、それぞれのコイルからの鋼帯を交互に順次接合していくことを特徴とする熱延鋼帯の連続熱処理方法。 A hot-rolled steel strip that joins a preceding steel strip with the same thickness and a subsequent steel strip manufactured by hot rolling and continuously passes through a heat treatment device that controls the ambient temperature to a predetermined temperature. In the continuous heat treatment method of
Preparing a normal winding coil wound around the steel strip along the rolling direction of the hot rolling, and a reverse winding coil rewinded with the front and rear ends of the steel strip reversed with respect to the rolling direction. A continuous heat treatment method for hot-rolled steel strips, characterized by alternately joining steel strips one after another. 前記先行する鋼帯及び後行する鋼帯の鋼種及び板幅が同一規格であることを特徴とする請求項１又は２記載の熱延鋼帯の連続熱処理方法。 The method for continuous heat treatment of a hot-rolled steel strip according to claim 1 or 2, wherein the preceding steel strip and the following steel strip have the same steel grade and sheet width. 前記熱処理が焼鈍であることを特徴とする請求項１〜３のいずれかに記載の熱延鋼帯の連続熱処理方法。 The said heat processing is annealing, The continuous heat processing method of the hot-rolled steel strip in any one of Claims 1-3 characterized by the above-mentioned.
JP2004039626A 2004-02-17 2004-02-17 Method for continuously heat-treating hot-rolled steel plate Withdrawn JP2005232482A (en)

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Cited By (2)

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WO2016052474A1 (en) * 2014-10-03 2016-04-07 Ｊｆｅスチール株式会社 Hearth roll and continuous annealing facility
WO2019163746A1 (en) 2018-02-22 2019-08-29 Ｊｆｅスチール株式会社 Steel sheet heating method in continuous annealing and continuous annealing facility

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016052474A1 (en) * 2014-10-03 2016-04-07 Ｊｆｅスチール株式会社 Hearth roll and continuous annealing facility
JP2016074931A (en) * 2014-10-03 2016-05-12 Ｊｆｅスチール株式会社 Hearth roll and continuous annealing facility
CN106715727A (en) * 2014-10-03 2017-05-24 杰富意钢铁株式会社 Hearth roll and continuous annealing facility
RU2674175C2 (en) * 2014-10-03 2018-12-05 ДжФЕ СТИЛ КОРПОРЕЙШН Hearth roll and continuous annealing facility
US10337082B2 (en) 2014-10-03 2019-07-02 Jfe Steel Corporation Hearth roll and continuous annealing facility
WO2019163746A1 (en) 2018-02-22 2019-08-29 Ｊｆｅスチール株式会社 Steel sheet heating method in continuous annealing and continuous annealing facility
KR20200099591A (en) 2018-02-22 2020-08-24 제이에프이 스틸 가부시키가이샤 Heating method and continuous annealing facility of steel sheet in continuous annealing

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