JP2003328039A - Continuous annealing process for steel plate - Google Patents
Continuous annealing process for steel plateInfo
- Publication number
- JP2003328039A JP2003328039A JP2002133631A JP2002133631A JP2003328039A JP 2003328039 A JP2003328039 A JP 2003328039A JP 2002133631 A JP2002133631 A JP 2002133631A JP 2002133631 A JP2002133631 A JP 2002133631A JP 2003328039 A JP2003328039 A JP 2003328039A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- continuous annealing
- temperature
- steel sheet
- plate
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は鋼板の連続焼鈍方法
に関するものであり、更に詳細には先行材から焼鈍条件
の異なる後行材への変更を円滑に行なえるようにした鋼
板の連続焼鈍方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for continuously annealing a steel sheet, and more particularly to a method for continuously annealing a steel sheet which enables smooth change from a preceding material to a following material having different annealing conditions. It is about.
【０００２】[0002]
【従来の技術】例えば溶融亜鉛めっきラインにおいて
は、図５に示すようにめっき装置１の前段に無酸化炉２
と還元炉３と冷却炉４とを直列に配置したガス加熱式の
連続焼鈍炉５が配置されている。鋼板は無酸化炉２の内
部で例えば６００℃まで加熱されたうえ、還元炉３の内
部で鋼板の種類に応じた温度まで更に加熱され、冷却炉
４を通過する間に５００℃前後まで徐冷され、めっき装
置１に送られる。2. Description of the Related Art For example, in a hot dip galvanizing line, as shown in FIG.
A gas heating type continuous annealing furnace 5 in which a reducing furnace 3 and a cooling furnace 4 are arranged in series is arranged. The steel sheet is heated to, for example, 600 ° C. inside the non-oxidizing furnace 2 and further heated to a temperature according to the type of the steel sheet inside the reducing furnace 3 and gradually cooled to around 500 ° C. while passing through the cooling furnace 4. And sent to the plating apparatus 1.
【０００３】無酸化炉２の出口の板温は鋼板の種類に関
係なく一定に管理されているが、図６に示すように還元
炉３出口の板温は、高温サイクル品は８００℃、中温サ
イクル品は７５０℃、低温サイクル品は７００℃という
ように鋼板の種類により様々に設定されている。また鋼
板の板厚も様々である。このため先行材と後行材との鋼
種や板厚が異なる場合には、その境界部（条件変更部）
で焼鈍条件を急速に変化させる必要がある。しかしガス
加熱炉は温度変化に対する応答性が悪く、条件変更に迅
速に対応できない。このため、先行材から焼鈍条件の異
なる後行材への切り替えを行なう場合には、条件変更に
伴う欠陥が発生する。The sheet temperature at the outlet of the non-oxidizing furnace 2 is controlled to be constant regardless of the type of steel sheet, but as shown in FIG. 6, the sheet temperature at the outlet of the reducing furnace 3 is 800 ° C. for medium-temperature cycle products and medium temperature. The cycle product is set to 750 ° C, the low temperature cycle product is set to 700 ° C, and various settings are made according to the type of steel sheet. Further, the thickness of the steel plate also varies. Therefore, when the steel type and plate thickness of the preceding material and the following material are different, the boundary part (condition change part)
Therefore, it is necessary to rapidly change the annealing conditions. However, the gas heating furnace has poor responsiveness to changes in temperature and cannot respond quickly to changes in conditions. For this reason, when switching from the preceding material to the following material with different annealing conditions, a defect occurs due to the condition change.
【０００４】例えば図７は、板厚が１．２mmの先行材か
ら板厚が１．６mmの後行材に鋼板の種類が変化するとき
の無酸化炉２の状態を示したグラフである。後行材は先
行材よりも板厚が厚いので、板温を６００℃の一定温度
に維持するためにはガス量を増加させねばならず、先行
材の終端部から徐々にガス量を増加させている。しかし
先行材の品質に影響を及ぼすために昇温には限界があ
る。そのため板厚が１．６mmの後行材への条件変更点が
無酸化炉２内を通過する際に、図示のように板温が急激
に低下して管理限界である５７０℃を下回ってしまう。For example, FIG. 7 is a graph showing the state of the non-oxidizing furnace 2 when the type of steel sheet changes from a preceding material having a thickness of 1.2 mm to a trailing material having a thickness of 1.6 mm. Since the trailing material is thicker than the preceding material, the amount of gas must be increased in order to maintain the plate temperature at a constant temperature of 600 ° C, and the amount of gas is gradually increased from the end of the preceding material. ing. However, there is a limit to the temperature rise because it affects the quality of the preceding material. Therefore, when the condition change point for the trailing material with a plate thickness of 1.6 mm passes through the non-oxidizing furnace 2, the plate temperature sharply drops as shown in the figure and falls below the control limit of 570 ° C. .
【０００５】そこで図７に示すようにラインスピードを
落とすとともにガス量を増加させることにより、板温を
上昇させて管理限界内に戻しているが、それまでに後行
材の頭の部分でかなりの長さにわたり「板温外れ」とな
る。また図８は板厚が１．２mmで設定温度の低い先行材
から、板厚が１．６mmで設定温度の高い後行材に鋼板の
種類が変化するときの還元炉３の状態を示したグラフで
ある。ここでも同様に、ラインスピードを落としている
にもかかわらず、後行材の頭の部分を急速に昇温させる
ことができず、かなりの長さにわたり「板温外れ」とな
る。Therefore, as shown in FIG. 7, the line speed is reduced and the gas amount is increased to raise the plate temperature to return it to the control limit, but by that time, the head portion of the trailing material has been considerably damaged. It is "out of plate temperature" over the length of. FIG. 8 shows the state of the reduction furnace 3 when the type of the steel sheet changes from a preceding material having a plate thickness of 1.2 mm and a low set temperature to a trailing material having a plate thickness of 1.6 mm and a high set temperature. It is a graph. In this case as well, even though the line speed is reduced, the head portion of the trailing material cannot be rapidly heated, resulting in "plate temperature deviation" over a considerable length.
【０００６】例えばラインスピードを１００ｍ/分とし
た場合、図７の無酸化炉２の「板温外れ」は１５０ｍに
達し、図８の還元炉３の「板温外れ」は３００ｍに達す
る。無酸化炉２の板温が低温側に外れるとカーボン残り
による不めっきを招き、高温側に外れるとめっきの密着
性の低下を招く。また還元炉３の板温が低温側に外れる
と未結晶による材質不良を招き、高温側に外れると粗大
粒による材質不良を招く。これらにより直接的な歩留ま
りの低下を生ずる。また、ラインスピードを落とすこと
によって後工程のめっき装置１などにも悪影響が生じ、
外観不良等の欠陥発生を招く。これらを総合すると、先
行材から焼鈍条件の異なる後行材への変更に伴う歩留ま
りの低下は大きい。For example, when the line speed is 100 m / min, the "plate temperature deviation" of the non-oxidizing furnace 2 of FIG. 7 reaches 150 m, and the "plate temperature deviation" of the reduction furnace 3 of FIG. 8 reaches 300 m. When the plate temperature of the non-oxidizing furnace 2 deviates to the low temperature side, non-plating due to carbon residue is caused, and when it deviates to the high temperature side, the adhesion of the plating deteriorates. Further, if the plate temperature of the reduction furnace 3 deviates to the low temperature side, material defects due to uncrystallized will occur, and if it deviates to the high temperature side, material defects due to coarse grains will occur. These cause a direct decrease in yield. In addition, reducing the line speed also has an adverse effect on the plating apparatus 1 in the subsequent process,
This causes defects such as poor appearance. When all of these are taken together, the yield decreases greatly when changing from the preceding material to the following material with different annealing conditions.
【０００７】[0007]
【発明が解決しようとする課題】本発明は上記した従来
の問題点を解決して、先行材から焼鈍条件の異なる後行
材への変更に伴う歩留まりの低下を最小限に抑制するこ
とができる鋼板の連続焼鈍方法を提供するためになされ
たものである。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art and can minimize the decrease in yield due to the change from the preceding material to the following material having different annealing conditions. It was made to provide a continuous annealing method for steel sheets.
【０００８】[0008]
【課題を解決するための手段】上記の課題を解決するた
めになされた本発明は、ガス加熱式の連続焼鈍炉による
鋼板の連続焼鈍方法において、先行材と後行材との境界
の条件変更部を、ラインスピードを変更させることなく
炉内に通板させるとともに、連続焼鈍炉に設置した誘導
加熱装置により、条件変更部の板温を迅速に変更するこ
とを特徴とするものである。なおガス加熱式の連続焼鈍
炉が、無酸化炉と還元炉と冷却炉とを直列に配置した連
続焼鈍炉であり、無酸化炉の入口と還元炉の入口とにそ
れぞれ設置した誘導加熱装置により、条件変更部の板温
を変更することが好ましい。DISCLOSURE OF THE INVENTION The present invention, which has been made to solve the above problems, is to change the condition of the boundary between the preceding material and the following material in the continuous annealing method for the steel sheet by the gas heating type continuous annealing furnace. The parts are passed through the furnace without changing the line speed, and the plate temperature of the condition changing part is rapidly changed by the induction heating device installed in the continuous annealing furnace. Note that the gas heating type continuous annealing furnace is a continuous annealing furnace in which a non-oxidizing furnace, a reducing furnace, and a cooling furnace are arranged in series, and the induction heating device is installed at the inlet of the non-oxidizing furnace and the inlet of the reducing furnace, respectively. It is preferable to change the plate temperature of the condition changing unit.
【０００９】本発明によれば、応答性に優れた誘導加熱
装置をガス加熱式の連続焼鈍炉の入口等に設置し、後行
材の板温を変更しておくことによって、先行材と後行材
との境界の条件変更部が炉内を通過することに伴う板温
変動を最小限に抑制し、「板温外れ」を大幅に短縮でき
る。またラインスピードを一定とするため、前後の工程
に悪影響を及ぼすことがない。According to the present invention, an induction heating device having excellent responsiveness is installed at the entrance of a gas-heating type continuous annealing furnace, and the plate temperature of the following material is changed, whereby The plate temperature fluctuation caused by the condition changing part at the boundary with the row material passing through the furnace can be minimized, and the "plate temperature deviation" can be greatly shortened. Further, since the line speed is constant, there is no adverse effect on the front and rear processes.
【００１０】[0010]
【発明の実施の形態】以下に本発明の好ましい実施形態
を示す。図１において、１は溶融亜鉛めっきを行うめっ
き装置であり、その前段に無酸化炉２と還元炉３と冷却
炉４とを直列に配置したガス加熱式の連続焼鈍炉５が配
置されていることは従来と同様である。しかし本発明で
は従来とは異なり、連続焼鈍炉５に誘導加熱装置６、７
が設置されている。この実施形態では、誘導加熱装置６
は無酸化炉２の入口に設置されており、誘導加熱装置７
は還元炉３の入口に設置されている。BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention are shown below. In FIG. 1, reference numeral 1 is a plating apparatus for hot dip galvanizing, and a gas heating type continuous annealing furnace 5 in which a non-oxidizing furnace 2, a reducing furnace 3 and a cooling furnace 4 are arranged in series is arranged in the preceding stage. This is the same as the conventional one. However, in the present invention, unlike the prior art, the continuous annealing furnace 5 is provided with the induction heating devices 6 and 7.
Is installed. In this embodiment, the induction heating device 6
Is installed at the entrance of the non-oxidizing furnace 2, and the induction heating device 7
Is installed at the inlet of the reduction furnace 3.
【００１１】誘導加熱装置６，７は電磁誘導により鋼板
を直接加熱することができるものであり、ガス加熱とは
異なり電力調整によって鋼板の加熱温度を迅速に変化さ
せることができる特性を持っている。この特性を利用し
て、本発明では以下に述べるように、先行材と後行材と
の境界の条件変更部が炉内を通過することに伴う板温変
動を、ラインスピードを一定に保ったままで最小限に抑
制する。The induction heating devices 6 and 7 are capable of directly heating the steel sheet by electromagnetic induction, and have a characteristic that, unlike gas heating, the heating temperature of the steel sheet can be rapidly changed by adjusting the electric power. . By utilizing this characteristic, in the present invention, as described below, the plate temperature fluctuation caused by the condition changing part at the boundary between the preceding material and the following material passing through the furnace is kept constant at the line speed. To a minimum.
【００１２】前記したと同様に板厚が１．２mmの先行材
から板厚が１．６mmの後行材に鋼板の種類が変化する場
合を例として説明する。図２は無酸化炉２を通過する際
の鋼板温度の変化を示すグラフであり、先行材は無酸化
炉２の出口で板温管理範囲内にまで加熱されているが、
板厚が厚い後行材は熱容量が大きいために、そのままで
は板温管理下限以下にまで温度ドロップしてしまう。そ
のドロップ幅は例えば６０℃である。Similar to the above, the case where the type of the steel plate changes from the preceding material having a plate thickness of 1.2 mm to the following material having a plate thickness of 1.6 mm will be described as an example. FIG. 2 is a graph showing a change in the steel plate temperature when passing through the non-oxidizing furnace 2. The preceding material is heated to the plate temperature control range at the outlet of the non-oxidizing furnace 2,
Since the succeeding material with a large plate thickness has a large heat capacity, the temperature will drop below the plate temperature control lower limit as it is. The drop width is, for example, 60 ° C.
【００１３】そこで本発明では、無酸化炉２の入口に設
置されている誘導加熱装置６を後行材に切り替わった瞬
間から作動させ、無酸化炉２の入口における後行材を加
熱して昇温させる。これにより後行材は図２に示すよう
に加熱されて行き、無酸化炉２の出口温度が板温管理範
囲内に入るようになる。なお入口温度により昇温勾配は
変化するので、無酸化炉２の入口における誘導加熱装置
６による昇温幅は、例えば１００℃程度となる。Therefore, in the present invention, the induction heating device 6 installed at the inlet of the non-oxidizing furnace 2 is activated from the moment when the material is switched to the trailing material, and the trailing material at the inlet of the non-oxidizing furnace 2 is heated to rise. Let it warm. As a result, the following material is heated as shown in FIG. 2, and the outlet temperature of the non-oxidizing furnace 2 comes to fall within the plate temperature control range. Since the temperature rise gradient changes depending on the inlet temperature, the temperature rise range by the induction heating device 6 at the inlet of the non-oxidizing furnace 2 is, for example, about 100 ° C.
【００１４】このようにして、無酸化炉２の入口に設置
されている誘導加熱装置６を用いて、板厚が１．２mmの
先行材から板厚が１．６mmの後行材に鋼板の種類が変化
した場合にも、ラインスピードを一定に保ったままで無
酸化炉２の出口温度を一定に保つことができる。同様
に、還元炉３の入口に設置された誘導加熱装置７を用い
て、還元炉３の出口温度を後行材に適した温度に調整す
ることができる。さらに、上記とは逆に先行材よりも後
行材の板厚が薄い場合にも、誘導加熱装置６、７を後行
材に切り替わった瞬間から停止させることにより、ライ
ンスピードを一定に保ったままで同様に板温制御を行う
ことができる。In this way, the induction heating device 6 installed at the inlet of the non-oxidizing furnace 2 is used to change a steel sheet from a preceding material having a thickness of 1.2 mm to a succeeding material having a thickness of 1.6 mm. Even when the type changes, the outlet temperature of the non-oxidizing furnace 2 can be kept constant while the line speed is kept constant. Similarly, the outlet temperature of the reducing furnace 3 can be adjusted to a temperature suitable for the succeeding material by using the induction heating device 7 installed at the inlet of the reducing furnace 3. Further, conversely to the above, even when the trailing material is thinner than the leading material, the line speed is kept constant by stopping the induction heating devices 6 and 7 from the moment of switching to the trailing material. Similarly, the plate temperature control can be performed.
【００１５】図３は本発明の効果を示すグラフであり、
図７に示した場合と同様に、板厚が１．２mmの先行材か
ら板厚が１．６mmの後行材に鋼板の種類が変化するとき
の無酸化炉２の状態を示したグラフである。図示のよう
に、条件変更点において誘導加熱装置６を動作させるこ
とにより、ラインスピードを一定に保ったままで板温を
一定に保つことができ、「板温外れ」を防止できる。な
お、後行材に移行した後はガス量を増加させるととも
に、誘導加熱装置６の出力を次第に絞って行けばよい。FIG. 3 is a graph showing the effect of the present invention.
Similar to the case shown in FIG. 7, a graph showing the state of the non-oxidizing furnace 2 when the type of the steel sheet changes from a preceding material having a thickness of 1.2 mm to a trailing material having a thickness of 1.6 mm. is there. As shown in the figure, by operating the induction heating device 6 at the condition change point, the plate temperature can be kept constant while the line speed is kept constant, and “plate temperature deviation” can be prevented. It should be noted that after the transition to the subsequent material, the gas amount may be increased and the output of the induction heating device 6 may be gradually reduced.
【００１６】また図４は図８と同様に、板厚が１．２mm
で設定温度の低い先行材から、板厚が１．６mmで設定温
度の高い後行材に鋼板の種類が変化するときの還元炉３
の状態を示したグラフである。本発明によれば条件変更
点において誘導加熱装置７を動作させることにより、ラ
インスピードを一定に保ったままで板温を急速に後行材
の設定温度まで昇温させることができ、「板温外れ」を
防止できる。Further, in FIG. 4, the plate thickness is 1.2 mm, as in FIG.
In the reduction furnace 3 when the type of steel plate changes from a preceding material with a low set temperature to a trailing material with a plate thickness of 1.6 mm and a high set temperature.
It is a graph showing the state of. According to the present invention, by operating the induction heating device 7 at the condition change point, the plate temperature can be rapidly raised to the set temperature of the following material while keeping the line speed constant. Can be prevented.
【００１７】前記したように、ラインスピードを１００
ｍ/分とした場合、従来は無酸化炉２の「板温外れ」は
１５０ｍに達し、還元炉３の「板温外れ」は３００ｍに
達していたのであるが、本発明によれば無酸化炉２の
「板温外れ」も還元炉３の「板温外れ」も、１０ｍ以下
にまで大幅に短縮することができた。As described above, the line speed is 100
In the case of m / min, conventionally, the “plate temperature deviation” of the non-oxidizing furnace 2 reached 150 m, and the “plate temperature deviation” of the reducing furnace 3 reached 300 m, but according to the present invention, no oxidation occurs. Both the "plate temperature deviation" of the furnace 2 and the "plate temperature deviation" of the reduction furnace 3 could be significantly shortened to 10 m or less.
【００１８】[0018]
【発明の効果】以上に説明したように、本発明の鋼板の
連続焼鈍方法は、応答性に優れた誘導加熱装置をガス加
熱式の連続焼鈍炉の入口等に設置し、条件変更部の通過
と同時に後行材の板温を急速に変更するようにしたもの
である。これによって炉出口における後行材の板温変動
を最小限に抑制し、「板温外れ」を大幅に短縮できる。
また従来のように板温調整のためにラインスピードを変
化させる必要がないため、前後工程に悪影響を及ぼすこ
ともない。この結果、本発明によれば連続焼鈍ラインの
総合的な歩留まりを１．２％程度向上させることが可能
となった。As described above, according to the continuous annealing method for a steel sheet of the present invention, an induction heating device having excellent responsiveness is installed at the inlet of a gas heating type continuous annealing furnace, and the condition changing portion is passed through. At the same time, the plate temperature of the subsequent material is changed rapidly. As a result, the plate temperature fluctuation of the following material at the furnace outlet can be suppressed to the minimum, and the "plate temperature deviation" can be greatly shortened.
Further, since it is not necessary to change the line speed for adjusting the plate temperature as in the conventional case, it does not adversely affect the front and rear processes. As a result, according to the present invention, it is possible to improve the overall yield of the continuous annealing line by about 1.2%.
【図１】本発明の実施形態を示す断面図である。FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
【図２】本発明の作用を説明するグラフである。FIG. 2 is a graph illustrating the operation of the present invention.
【図３】鋼板の種類が変化するときの無酸化炉の状態を
示したグラフである。FIG. 3 is a graph showing the state of the non-oxidizing furnace when the type of steel sheet changes.
【図４】鋼板の種類が変化するときの還元炉の状態を示
したグラフである。FIG. 4 is a graph showing the state of the reduction furnace when the type of steel sheet changes.
【図５】従来例を示す断面図である。FIG. 5 is a cross-sectional view showing a conventional example.
【図６】鋼板の連続焼鈍の温度変化を説明するグラフで
ある。FIG. 6 is a graph illustrating a temperature change in continuous annealing of a steel sheet.
【図７】鋼板の種類が変化するときの従来の無酸化炉の
状態を示したグラフである。FIG. 7 is a graph showing the state of a conventional non-oxidizing furnace when the type of steel sheet changes.
【図８】鋼板の種類が変化するときの従来の還元炉の状
態を示したグラフである。FIG. 8 is a graph showing the state of a conventional reduction furnace when the type of steel sheet changes.
１ めっき装置 ２ 無酸化炉 ３ 還元炉 ４ 冷却炉 ５ ガス加熱式の連続焼鈍炉 ６ 誘導加熱装置 ７ 誘導加熱装置 1 Plating equipment 2 non-oxidizing furnace 3 reduction furnace 4 cooling furnace 5 Gas heating type continuous annealing furnace 6 induction heating device 7 Induction heating device
Claims (2)
続焼鈍方法において、先行材と後行材との境界の条件変
更部を、ラインスピードを変更させることなく炉内に通
板させるとともに、連続焼鈍炉に設置した誘導加熱装置
により、条件変更部の板温を迅速に変更することを特徴
とする鋼板の連続焼鈍方法。1. A method for continuously annealing a steel sheet in a gas heating type continuous annealing furnace, wherein a condition changing part at a boundary between a preceding material and a following material is passed through the furnace without changing a line speed, A continuous annealing method for a steel sheet, characterized in that an induction heating device installed in a continuous annealing furnace is used to rapidly change the sheet temperature in a condition changing section.
還元炉と冷却炉とを直列に配置した連続焼鈍炉であり、
無酸化炉の入口と還元炉の入口とにそれぞれ設置した誘
導加熱装置により、条件変更部の板温を変更することを
特徴とする請求項１記載の鋼板の連続焼鈍方法。2. A gas heating type continuous annealing furnace is a continuous annealing furnace in which a non-oxidizing furnace, a reducing furnace and a cooling furnace are arranged in series,
The continuous annealing method for a steel sheet according to claim 1, wherein the sheet temperature of the condition changing section is changed by induction heating devices respectively installed at the inlet of the non-oxidizing furnace and the inlet of the reducing furnace.
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| JP2002133631A JP2003328039A (en) | 2002-05-09 | 2002-05-09 | Continuous annealing process for steel plate |
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|---|---|---|---|
| JP2002133631A JP2003328039A (en) | 2002-05-09 | 2002-05-09 | Continuous annealing process for steel plate |
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| WO2008126911A1 (en) | 2007-04-05 | 2008-10-23 | Nippon Steel Corporation | Method of continuous annealing for steel strip with curie point and continuous annealing apparatus therefor |
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2002
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2008126911A1 (en) | 2007-04-05 | 2008-10-23 | Nippon Steel Corporation | Method of continuous annealing for steel strip with curie point and continuous annealing apparatus therefor |
| RU2617085C2 (en) * | 2012-09-03 | 2017-04-19 | ДжФЕ СТИЛ КОРПОРЕЙШН | Device for quick heating of continuous oxyging line |
| US10072318B2 (en) | 2012-09-03 | 2018-09-11 | Jfe Steel Corporation | Rapid heating apparatus of continuous annealing line |
| CN104342547A (en) * | 2013-07-31 | 2015-02-11 | 宝山钢铁股份有限公司 | Grading type hot blowing method of continuous annealing furnace |
| CN104342547B (en) * | 2013-07-31 | 2017-03-01 | 宝山钢铁股份有限公司 | A kind of stagewise thermal purging method of continuous annealing furnace |
| JP2015030891A (en) * | 2013-08-05 | 2015-02-16 | Ｊｆｅスチール株式会社 | Method and apparatus for control of continuous annealing line |
| WO2015099402A1 (en) | 2013-12-25 | 2015-07-02 | 주식회사 포스코 | Continuous annealing apparatus for strip and continuous annealing method for same |
| US10358691B2 (en) | 2013-12-25 | 2019-07-23 | Posco | Apparatus for continuous annealing of strip and method for continuous annealing of same |
| US10604820B2 (en) | 2013-12-25 | 2020-03-31 | Posco | Method of continuously annealing a strip |
| KR20210030030A (en) | 2019-09-09 | 2021-03-17 | 주식회사 포스코 | Method for manufacturing a high strength steel sheet having good bending-formability by using slloy steel |
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