JP2721293B2 - Induction heating furnace - Google Patents
Induction heating furnaceInfo
- Publication number
- JP2721293B2 JP2721293B2 JP4355272A JP35527292A JP2721293B2 JP 2721293 B2 JP2721293 B2 JP 2721293B2 JP 4355272 A JP4355272 A JP 4355272A JP 35527292 A JP35527292 A JP 35527292A JP 2721293 B2 JP2721293 B2 JP 2721293B2
- Authority
- JP
- Japan
- Prior art keywords
- heating furnace
- induction heating
- induction
- cover
- rolling mill
- 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.)
- Expired - Fee Related
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
- General Induction Heating (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、誘導加熱炉に関し、特
に連続鋳造により製造される一方向性電磁鋼板用スラブ
を熱間圧延に適した温度に加熱するための誘導加熱炉に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating furnace, and more particularly to an induction heating furnace for heating a slab for a grain-oriented electrical steel sheet manufactured by continuous casting to a temperature suitable for hot rolling. .
【０００２】[0002]
【従来の技術】方向性電磁鋼板の製造過程に於て、最終
仕上げ焼鈍で一次再結晶の正常粒成長を抑制して二次再
結晶を促進させるために、例えば、ＭｎＳ、ＡｌＮ、Ｃ
ｕ1.8、（Ｃｕ・Ｍｎ）1.8Ｓ、ＭｎＳｅ、ＢＮ等のよう
な析出分散相が用いられる。これら析出分散相は、微細
析出粒子として鋼中に均一に分散させる必要性があるた
め、スラブの段階で粗大に析出したものを、熱延に先立
つ加熱時に完全に固溶・拡散させることが必要である。
そのため、摂氏１２５０度〜１４００度といった高温で
加熱することが要求されるが、この場合、例えば特願平
３−６７１８３号明細書に記載されているように、誘導
加熱炉を用いた加熱が適している。2. Description of the Related Art In the manufacturing process of grain-oriented electrical steel sheets, for example, MnS, AlN, and C are used in order to suppress normal grain growth of primary recrystallization and promote secondary recrystallization in final finish annealing.
Precipitated and dispersed phases such as u 1.8 , (Cu · Mn) 1.8 S, MnSe, and BN are used. Since these precipitated dispersed phases need to be uniformly dispersed in steel as fine precipitated particles, it is necessary to completely dissolve and diffuse those that have coarsely precipitated in the slab stage during heating prior to hot rolling. It is.
Therefore, it is required to heat at a high temperature of 1250 to 1400 degrees Celsius. In this case, for example, as described in Japanese Patent Application No. 3-67183, heating using an induction heating furnace is suitable. ing.
【０００３】ところで、上記出願にて提案されているよ
うな圧延機に近接する位置は、周囲環境が高温多湿なた
め、誘導コイルなどの電気装置が設けられた誘導加熱炉
にとって好ましい環境とは言い難い。と言うのは、ライ
ン上を流れる加熱されたスラブの放射熱に直接曝される
と、誘導コイルの絶縁材が熱によって溶損する虞れがあ
る上、水デスケリング装置から噴射された微細な水滴と
共に飛散したスケールがコイルに付着すると、コイルが
ショートするなどしてインバータがトリップしたり、あ
るいはコイルの一部が焼損したりするトラブルを発生す
る可能性が高いからである。[0003] By the way, the position close to the rolling mill as proposed in the above-mentioned application is a preferable environment for an induction heating furnace provided with an electric device such as an induction coil because the surrounding environment is hot and humid. hard. This is because, when exposed directly to the radiant heat of the heated slab flowing on the line, the insulation of the induction coil may be melted by the heat and, together with the fine water droplets jetted from the water deskering device, If the scattered scale adheres to the coil, there is a high possibility that the inverter will trip due to a short-circuit of the coil or a part of the coil will be burnt.
【０００４】[0004]
【発明が解決しようとする課題】これらの問題に対処す
るために、誘導加熱炉の周囲を保護カバーで覆うことが
考えられたが、冷却のためにカバー内に外気を導入する
と、これが炉内に侵入して炉内の酸素濃度が高まり、そ
のためにスケールが著しく増加するといった不都合が生
じた。In order to address these problems, it has been considered to cover the periphery of the induction heating furnace with a protective cover. And the oxygen concentration in the furnace was increased, thereby causing a problem that the scale was significantly increased.
【０００５】本発明は、このような従来技術の不都合を
解消すべく案出されたものであり、その主な目的は、上
記種々のトラブルが生じることなく圧延機の近傍に設置
可能な構成の誘導加熱炉を提供することにある。The present invention has been devised to solve such disadvantages of the prior art, and its main object is to provide a structure which can be installed near a rolling mill without causing the above-mentioned various troubles. An object of the present invention is to provide an induction heating furnace.
【０００６】[0006]
【課題を解決するための手段】このような目的は、本発
明によれば、誘導コイルによって被圧延材を加熱するた
めに粗圧延機に近接する位置に設置される誘導加熱炉に
於て、当該誘導加熱炉の少なくとも誘導コイルの周囲を
カバーで覆い、かつカバー内の空気を換気手段で常時清
浄に保つことによって浮遊する粉塵や微細な水滴から誘
導コイルを保護すると共に、前記カバーの内圧を当該誘
導加熱炉の内圧よりも相対的に低くなるように圧力制御
手段で維持することによってカバー内の空気が誘導加熱
炉内に侵入しないようにしたことを特徴とする誘導加熱
炉を提供することによって達成される。SUMMARY OF THE INVENTION According to the present invention, there is provided an induction heating furnace installed at a position close to a rough rolling mill for heating a material to be rolled by an induction coil. At least around the induction coil of the induction heating furnace
Cover with a cover, and constantly clean the air inside the cover with ventilation.
Induced by floating dust and fine water droplets
Protects the conductive coil and induces the internal pressure of the cover
Pressure control so that it is relatively lower than the internal pressure of the induction heating furnace
Air in the cover is induction heated by means of maintenance
This is achieved by providing an induction heating furnace characterized in that it does not enter the furnace.
【０００７】[0007]
【作用】このような構成によれば、カバー内が清浄な空
気で常に置換されるので、誘導加熱炉周囲を浮遊する粉
塵および微細な水滴などが誘導コイルなどの電気部品に
付着することや、飽和水蒸気がコイルに凝縮すること
を、確実に防止し得る。しかも誘導加熱炉に近接する位
置を通過するスラブの放射熱にコイルが直接曝されずに
済むので、コイルの絶縁材の熱劣化を防止し得る。それ
に加えて、誘導加熱炉内圧に比してカバー内圧を相対的
に低く維持することにより、誘導加熱炉内への外気の侵
入を防止できる。According to this structure, since the inside of the cover is constantly replaced with clean air, dust and fine water droplets floating around the induction heating furnace adhere to electric components such as the induction coil, It is possible to reliably prevent the saturated steam from condensing on the coil. Moreover, since the coil does not need to be directly exposed to the radiant heat of the slab passing through the position close to the induction heating furnace, thermal deterioration of the insulating material of the coil can be prevented. In addition, by keeping the internal pressure of the cover relatively lower than the internal pressure of the induction heating furnace, it is possible to prevent outside air from entering the induction heating furnace.
【０００８】[0008]
【実施例】以下に添付の図面に示された具体的な実施例
に基づいて本発明の構成を詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the present invention will be described below in detail with reference to specific embodiments shown in the accompanying drawings.
【０００９】図１は、本発明が適用された誘導加熱炉を
設置した連続式熱間圧延設備の一例を示している。この
連続圧延設備は、ガス式スラブ加熱炉１、幅圧下用竪型
粗圧延機２、複数あるいは１台のスタンドからなる粗圧
延機３、および連続仕上げ圧延機４からなり、これら
は、ローラテーブル５をもって互いに連続している。FIG. 1 shows an example of a continuous hot rolling facility provided with an induction heating furnace to which the present invention is applied. This continuous rolling equipment comprises a gas slab heating furnace 1, a vertical rough rolling mill 2 for width reduction, a rough rolling mill 3 comprising a plurality of or one stand, and a continuous finishing rolling mill 4. 5 are continuous with each other.
【００１０】粗圧延機３と連続仕上げ圧延機４との間に
は、粗圧延されたシートバーの保温およびエッジ部分の
保温あるいは加熱を行うためのバー加熱装置６およびエ
ッジ加熱装置７が、必要に応じて設けられる。Between the rough rolling mill 3 and the continuous finishing rolling mill 4, a bar heating device 6 and an edge heating device 7 for keeping the heat of the roughly rolled sheet bar and the heat or heating of the edge portion are required. It is provided according to.
【００１１】連続仕上げ圧延機４の直前には、クロップ
シャー８が設けられる場合があり、また幅圧下用竪型粗
圧延機２の直後には、幅圧下されたスラブを平坦に矯正
するか、あるいは更に圧下を加えて形状矯正するための
予備圧延機９が設けられる場合がある。In some cases, a crop shear 8 is provided immediately before the continuous finishing mill 4. Immediately after the vertical rough rolling mill 2 for width reduction, the slab whose width has been reduced is straightened. Alternatively, there may be a case where a preliminary rolling mill 9 for further reducing the shape and correcting the shape is provided.
【００１２】なお、連続仕上げ圧延機４の下流側には、
図示省略したが、巻き取り装置が設けられる。In addition, on the downstream side of the continuous finishing rolling mill 4,
Although not shown, a winding device is provided.
【００１３】幅圧下用竪型粗圧延機２と粗圧延機３との
間には、ローラテーブル５に対向して誘導加熱炉１１が
設けられる。この誘導加熱炉１１は、温度降下の時間を
極力与えずに速やかに粗圧延機３にスラブを噛込ませる
ことが好ましいことから、粗圧延機３にできるだけ近接
した位置に設けることが望ましい。An induction heating furnace 11 is provided between the vertical rough rolling mill 2 for width reduction and the rough rolling mill 3 so as to face the roller table 5. The induction heating furnace 11 is preferably provided at a position as close as possible to the rough rolling mill 3 because it is preferable that the slab be quickly bitten into the rough rolling mill 3 without giving a time of temperature decrease as much as possible.
【００１４】図２は、本発明に基づき構成された誘導加
熱炉１１の縦断面図である。この誘導加熱炉１１は、耐
火物からなる炉壁１２の外周部に誘導コイル１３を巻装
してなり、誘導コイル１３に電流を印加することによ
り、炉内に配設された置き台１４上に載架される被加熱
物としてのスラブ１５を発熱させるようになっている。
そして置き台１４は、昇降装置１６にて上下に駆動され
る支持架台１７上に設置されている。FIG. 2 is a longitudinal sectional view of the induction heating furnace 11 constructed according to the present invention. The induction heating furnace 11 has an induction coil 13 wound around an outer peripheral portion of a furnace wall 12 made of a refractory, and a current is applied to the induction coil 13 so that the induction coil 13 is placed on a table 14 disposed in the furnace. The slab 15 as an object to be heated mounted on the device is caused to generate heat.
The table 14 is installed on a support base 17 that is driven up and down by a lifting device 16.
【００１５】さて、連続熱間圧延設備の周囲環境は、一
般的に高温多湿であり、誘導加熱炉１１の誘導コイル１
３にとっては過酷な環境と言える。特にローラテーブル
５上を流れるスラブの熱によって誘導コイル１３の絶縁
材が溶損したり、微細な水滴やスケールが付着したりし
て誘導コイル１３がショートする虞れがある。そこで本
発明に於ては、誘導加熱炉１１の誘導コイル１３の周囲
を保護カバー１８にて覆うものとした。なお本実施例に
おいては、図２に示したように、誘導加熱炉１１の炉下
部を除く部分の全体を保護カバー１８で覆うものとして
いる。 The surrounding environment of the continuous hot rolling equipment is generally hot and humid.
For 3, it can be said that it is a harsh environment. In particular, the heat of the slab flowing on the roller table 5 may cause the insulating material of the induction coil 13 to be melted or adhered to minute water droplets or scales, and the induction coil 13 may be short-circuited. Therefore, in the present invention, the periphery of the induction coil 13 of the induction heating furnace 11 is covered with the protective cover 18. In this embodiment,
In this case, as shown in FIG.
Cover the entire part except the part with the protective cover 18
I have.
【００１６】保護カバー１８には、吸引ブロワ１９と外
気導入ダクト２０とが接続されている。これにより、保
護カバー１８内の換気が常時行われるようになってい
る。The protective cover 18 is connected to a suction blower 19 and an outside air introduction duct 20. Thereby, ventilation in the protective cover 18 is always performed.
【００１７】誘導加熱炉１１の最も圧力の低い下部装入
開口付近の圧力とカバー内圧とをそれぞれ別個に測定す
るために、圧力検出器２１・２２が適所に設けられてい
る。これら圧力検出器２１・２２の出力は、制御装置２
３に接続されている。In order to separately measure the pressure near the lower charging opening of the induction heating furnace 11 and the inner pressure of the cover, pressure detectors 21 and 22 are provided at appropriate places. The outputs of these pressure detectors 21 and 22 are
3 is connected.
【００１８】このような構成をもって、例えば、容量が
５０ｍ３／ｍｉｎの吸引ブロワ１９を用い、保護カバー
１８内の空気を吸引し、かつ外気導入ダクト２０から清
浄な空気を導入した。そして誘導加熱炉１１の内圧と保
護カバー１８の内圧とを比較し、炉内圧が０．２mmＡ
ｑ、カバー内圧が−０．３mmＡｑとなるように吸引ブロ
ワ１９の吸引量を制御して保護カバー１８内の誘導加熱
炉１１内に対する負圧傾向状態を維持することにより、
誘導加熱炉１１内に保護カバー１８内の空気が侵入する
虞れを皆無にすることができる。With such a configuration, for example, a suction blower 19 having a capacity of 50 m3 / min is used to suck the air in the protective cover 18 and introduce clean air from the outside air introduction duct 20. Then, the internal pressure of the induction heating furnace 11 is compared with the internal pressure of the protective cover 18, and the furnace internal pressure is set to 0.2 mmA.
q, induction heating in the protective cover 18 by controlling the suction amount of the suction blower 19 so that the cover internal pressure becomes -0.3 mmAq.
By maintaining the negative pressure tendency state inside the furnace 11 ,
The possibility that air in the protective cover 18 enters the induction heating furnace 11 can be completely eliminated.
【００１９】なお、上記吸引ブロワ１９に加えて押し込
みブロワを誘導加熱炉１１に接続し、誘導加熱炉１１内
に吹き込む不活性ガスの圧力が保護カバー１８内圧より
も高くなるようにしても同様な効果が得られる。この場
合は、例えば容量が５０ｍ3／ｍｉｎの送風機で誘導加
熱炉１１内に送気し、誘導加熱炉１１の内圧を０．８mm
Ａｑにし、かつ保護カバー１８の内圧が０．３mmＡｑを
越えないように維持することにより、好適なエアパージ
効果が得られる。The same applies to the case where a push-in blower is connected to the induction heating furnace 11 in addition to the suction blower 19 so that the pressure of the inert gas blown into the induction heating furnace 11 becomes higher than the internal pressure of the protective cover 18. The effect is obtained. In this case, for example, air is blown into the induction heating furnace 11 by a blower having a capacity of 50 m 3 / min, and the internal pressure of the induction heating furnace 11 is set to 0.8 mm.
By setting the pressure to Aq and maintaining the internal pressure of the protective cover 18 not to exceed 0.3 mmAq, a suitable air purge effect can be obtained.
【００２０】[0020]
【発明の効果】このように本発明によれば、スラブの熱
や微細な水滴から誘導コイルを保護し得るので、従来は
環境が過酷なために到底設置できなかったようなところ
にも誘導加熱炉を設置することができるようになる。従
って、熱間圧延設備のレイアウトの自由度が高くなり、
作業工程の合理化を推進するうえに多大な効果を奏する
ことができる。また、誘導コイルの周囲に送り込んだ空
気が誘導加熱炉内には侵入しないので、鋼材のスケール
発生量を増大させずに済み、品質向上を達成するうえに
も効果的である。As described above, according to the present invention, the heat of the slab is
And can protect the induction coil from fine water droplets.
The induction heating furnace can be installed in a place where it could not be installed due to the severe environment . Therefore, the degree of freedom in the layout of the hot rolling equipment is increased,
A great effect can be achieved in promoting the rationalization of the work process. In addition, the air sent around the induction coil
Since air does not enter the induction heating furnace, it is not necessary to increase the scale generation amount of the steel material, which is effective in achieving quality improvement.
【図１】本発明による誘導加熱炉を設置した連続式熱間
圧延設備の説明図。FIG. 1 is an explanatory view of a continuous hot rolling equipment provided with an induction heating furnace according to the present invention.
【図２】本発明の一実施例を示す垂直断面図。FIG. 2 is a vertical sectional view showing one embodiment of the present invention.
１ ガス式スラブ加熱炉 ２ 幅圧下用竪型粗圧延機 ３ 粗圧延機 ４ 連続仕上げ圧延機 ５ ローラテーブル ６ バー加熱装置 ７ エッジ加熱装置 ９ 予備圧延機 １１ 誘導加熱炉 １２ 炉壁 １３ 誘導コイル １４ 置き台 １５ スラブ １６ 昇降装置 １７ 支持架台 １８ 保護カバー １９ 吸引ブロワ ２０ 外気導入ダクト ２１・２２ 圧力検出器 ２３ 制御装置DESCRIPTION OF SYMBOLS 1 Gas-type slab heating furnace 2 Vertical rough rolling mill for width reduction 3 Rough rolling mill 4 Continuous finishing rolling mill 5 Roller table 6 Bar heating device 7 Edge heating device 9 Pre-rolling machine 11 Induction heating furnace 12 Furnace wall 13 Induction coil 14 Table 15 Slab 16 Lifting device 17 Supporting stand 18 Protective cover 19 Suction blower 20 Outside air introduction duct 21 ・ 22 Pressure detector 23 Control device
───────────────────────────────────────────────────── フロントページの続き (72)発明者 石井 守 姫路市広畑区富士町１番地 新日本製鐵 株式会社 広畑製鐵所内 (56)参考文献 特開 平４−61784（ＪＰ，Ａ) 特開 昭50−137314（ＪＰ，Ａ) 特開 昭64−62411（ＪＰ，Ａ) 実開 平３−89153（ＪＰ，Ｕ) 特公 昭63−4611（ＪＰ，Ｂ２) ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mamoru Ishii 1 Fujimachi, Hirohata-ku, Himeji-shi Nippon Steel Corporation Hirohata Works (56) References JP-A-4-61784 (JP, A) JP-A-50-137314 (JP, A) JP-A-64-62411 (JP, A) JP-A-3-89153 (JP, U) JP-B-63-4611 (JP, B2)
Claims (1)
ために粗圧延機に近接する位置に設置される誘導加熱炉
に於て、 当該誘導加熱炉の少なくとも前記誘導コイルの周囲をカ
バーで覆い、かつ前記カバー内の空気を換気手段で常時
清浄に保つことにより、浮遊する粉塵や微細な水滴が前
記誘導コイルに接触しないようにすると共に、 前記カバーの内圧を当該誘導加熱炉の内圧よりも相対的
に低くなるように圧力制御手段で維持することによって
前記カバー内の空気が当該誘導加熱炉内に侵入しないよ
うにした ことを特徴とする誘導加熱炉。In an induction heating furnace installed near a rough rolling mill to heat a material to be rolled by the induction coil, at least a periphery of the induction coil of the induction heating furnace is cooled.
Cover with a bar, and always ventilate the air inside the cover with ventilation.
Keeping them clean ensures that floating dust and fine water droplets
Not to contact the induction coil, and make the internal pressure of the cover relative to the internal pressure of the induction heating furnace.
By maintaining the pressure control means
The air in the cover does not enter the induction heating furnace.
Induction furnace, characterized in that there was Unishi.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4355272A JP2721293B2 (en) | 1992-12-17 | 1992-12-17 | Induction heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4355272A JP2721293B2 (en) | 1992-12-17 | 1992-12-17 | Induction heating furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06184625A JPH06184625A (en) | 1994-07-05 |
| JP2721293B2 true JP2721293B2 (en) | 1998-03-04 |
Family
ID=18442968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4355272A Expired - Fee Related JP2721293B2 (en) | 1992-12-17 | 1992-12-17 | Induction heating furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2721293B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102564124A (en) * | 2011-07-28 | 2012-07-11 | 郑坚明 | Industrial electromagnetic smelting furnace |
| CN103045811A (en) * | 2012-12-19 | 2013-04-17 | 苏州工业园区姑苏科技有限公司 | Barstock rotating induction quenching device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4690654B2 (en) * | 2004-02-05 | 2011-06-01 | 新日本製鐵株式会社 | Furnace wall structure of induction heating furnace |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50137314A (en) * | 1974-04-23 | 1975-10-31 | ||
| JPS634611A (en) * | 1986-06-25 | 1988-01-09 | Hitachi Ltd | Semiconductor device and manufacture thereof |
| JPS6462411A (en) * | 1987-08-31 | 1989-03-08 | Kawasaki Steel Co | Method for controlling atmosphere in induction heating furnace |
| JP2940085B2 (en) * | 1990-06-27 | 1999-08-25 | 三菱電機株式会社 | Induction heating device for slab material |
| US6735096B2 (en) * | 2002-01-10 | 2004-05-11 | Digipower Manufacturing Inc. | Uninterruptible DC power system |
-
1992
- 1992-12-17 JP JP4355272A patent/JP2721293B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102564124A (en) * | 2011-07-28 | 2012-07-11 | 郑坚明 | Industrial electromagnetic smelting furnace |
| CN103045811A (en) * | 2012-12-19 | 2013-04-17 | 苏州工业园区姑苏科技有限公司 | Barstock rotating induction quenching device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06184625A (en) | 1994-07-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2011095961A2 (en) | Slab processing method and slab processing system | |
| JP2002538310A (en) | Method and apparatus for heating metal strip | |
| JP2721293B2 (en) | Induction heating furnace | |
| JP4055440B2 (en) | Direct-rolling method for continuous cast slabs | |
| JPS58120733A (en) | Continuous annealing method of electromagnetic steel plate | |
| JP3575400B2 (en) | Direct-feed rolling method of continuous cast slab | |
| JP2695394B2 (en) | Operating method of continuous heat treatment furnace | |
| JP2693690B2 (en) | Method and device for transporting unidirectional electrical steel sheet coil | |
| JP3345769B2 (en) | Method for producing hot-rolled steel strip and hot-rolling equipment line used for this method | |
| JP2863351B2 (en) | Heating method of directional magnetic steel slab | |
| US6439883B1 (en) | Threading and scale removal device | |
| JP2971289B2 (en) | Vertical induction heating furnace with lower loading | |
| JP3371820B2 (en) | Continuous heat treatment method for steel strip | |
| JP3168753B2 (en) | Threading method in direct reduction heating equipment of continuous metal strip processing line | |
| JPS59190327A (en) | Method for keeping hot slab hot | |
| JP3033888B2 (en) | Steel strip support for annealing furnace | |
| JPS58120731A (en) | Continuous annealing furnace for electrical steel plate | |
| KR100451823B1 (en) | Slow Cooling Method For Hot Rolled Wire Rod | |
| JPS6213248A (en) | Continuous casting machine | |
| JPS6321565Y2 (en) | ||
| JPS58120732A (en) | Continuous annealing furnace for electromagnetic steel plate | |
| JP2001073041A (en) | Method for controlling temperature of steel sheet and temperature controlling device | |
| JPS6044120A (en) | Heat radiation preventing device of hot strip mill | |
| JPH08127819A (en) | Method and device for flattened annealing for grain oriented silicon steel sheet | |
| JPH06212268A (en) | Induction heating furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19971028 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20071121 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20081121 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20081121 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091121 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101121 Year of fee payment: 13 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101121 Year of fee payment: 13 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20111121 Year of fee payment: 14 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20111121 Year of fee payment: 14 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20121121 Year of fee payment: 15 |
|
| LAPS | Cancellation because of no payment of annual fees |