JPH05339648A - Furnace body partition device for vertical type direct firing heating furnace - Google Patents
Furnace body partition device for vertical type direct firing heating furnaceInfo
- Publication number
- JPH05339648A JPH05339648A JP17497592A JP17497592A JPH05339648A JP H05339648 A JPH05339648 A JP H05339648A JP 17497592 A JP17497592 A JP 17497592A JP 17497592 A JP17497592 A JP 17497592A JP H05339648 A JPH05339648 A JP H05339648A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- roll chamber
- steel strip
- heating furnace
- roll
- 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.)
- Granted
Links
Landscapes
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は複数の炉体を有する竪型
直火加熱炉における炉体仕切装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a furnace body partitioning device in a vertical direct-fired heating furnace having a plurality of furnace bodies.
【０００２】[0002]
【従来の技術】ストリップに対して熱処理を施すべく加
熱炉、冷却炉等の熱処理炉内を連続的に通板させるスト
リップ連続熱処理設備がある。2. Description of the Related Art There is a strip continuous heat treatment facility for continuously passing through a heat treatment furnace such as a heating furnace or a cooling furnace to heat treat a strip.
【０００３】このような熱処理設備の一例としてのスト
リップの連続熱鈍処理設備にあっては、熱処理炉として
加熱炉、均熱炉、一次冷却炉及び二次冷却炉を有し、ス
トリップを各炉に連続的に通板させている。これらの炉
のうち加熱炉においては、複数の炉体より構成されてい
て、しかもストリップ表裏面に直火バーナによる火炎を
直接吹付けることにより、ストリップを急速加熱する所
謂竪型直火加熱炉を用いる技術が省エネルギーの観点か
ら広く採用されてきている。A continuous thermal annealing treatment equipment for strips as an example of such heat treatment equipment has a heating furnace, a soaking furnace, a primary cooling furnace and a secondary cooling furnace as heat treatment furnaces, and strips are provided in respective furnaces. Are continuously threaded. Among these furnaces, the heating furnace is a so-called vertical type direct heating furnace that is composed of a plurality of furnace bodies, and that directly sprays a flame from a direct-burning burner on the front and back surfaces of the strip to rapidly heat the strip. The technology used has been widely adopted from the viewpoint of energy saving.
【０００４】上記技術にあっては、急速加熱にともない
炉内温度も非常に高温となることから、この加熱炉を構
成する各部材の耐火性・耐熱性が問題視されている。特
に、各炉体にストリップを搬送するために、各炉体間に
跨って形成されたロール室内に設けられたターンロール
にあっては、ロール室内の温度がその品質に大きな影響
を与えるもので、例えば、ストリップの板温とロール室
内の温度との差が大きい場合、ターンロールがその幅方
向に不均一な温度分布となる。そのため、半径方向の熱
変化量、即ちヒートクラウンがロールの幅方向位置によ
り著しく異なるようになり、この状態で幅広のストリッ
プを搬送すると、ストリップが蛇行するウォークや、ス
トリップが幅方向に座屈変形するヒートバックル等が生
じる問題があるため、ロール室に侵入する高温ガスによ
る温度上昇を防止し、かつ温度を加熱ストリップより若
干高めに保持する必要がある。In the above technique, since the temperature inside the furnace becomes extremely high with rapid heating, the fire resistance and heat resistance of each member constituting this heating furnace are considered problematic. In particular, in the case of a turn roll provided in the roll chamber formed between the furnace bodies in order to convey the strip to each furnace body, the temperature in the roll chamber has a great influence on the quality. For example, if the difference between the strip plate temperature and the temperature in the roll chamber is large, the turn roll has a non-uniform temperature distribution in the width direction. Therefore, the amount of change in heat in the radial direction, that is, the heat crown, becomes significantly different depending on the position in the width direction of the roll, and when a wide strip is conveyed in this state, the strip meanders and the strip buckles and deforms in the width direction. Therefore, it is necessary to prevent the temperature from rising due to the high temperature gas that enters the roll chamber and to keep the temperature slightly higher than the heating strip.
【０００５】[0005]
【発明が解決しようとする課題】そこで、炉体からロー
ル室への排ガスの侵入を遮断するためには、ストリップ
を水冷のダンパを用いるなどして直接挟みこんで排ガス
をシールする技術が一般的に用いられているが、ストリ
ップ表面にキズを発生させる虞があるため、実操業では
ストリップが通過し得る間隙を介してロール室と炉体と
を仕切るようにせざるを得ず、特に、炉内温度差の大き
い炉体間に形成されたロール室にあっては流れの早い排
ガスが侵入しようとするため、ロール室への排ガスの侵
入を完全に遮断することができず、この点の改良が望ま
れていた。Therefore, in order to block the invasion of exhaust gas from the furnace body to the roll chamber, a technique of directly sandwiching the strip by using a water-cooled damper and sealing the exhaust gas is generally used. However, since there is a risk of scratches on the strip surface, in actual operation, the roll chamber and the furnace body must be partitioned through a gap through which the strip can pass. In the roll chamber formed between the furnace bodies with a large temperature difference, the exhaust gas with a fast flow tries to invade, so it is not possible to completely block the invasion of the exhaust gas into the roll chamber. Was wanted.
【０００６】このような従来技術の問題点に鑑み、本発
明の主な目的は、直火バーナにより発生する高温の排ガ
スのロール室内への侵入を防止できる竪型直火加熱炉に
おける仕切装置を提供することにある。In view of the above problems of the prior art, a main object of the present invention is to provide a partitioning device in a vertical direct-fired heating furnace capable of preventing high temperature exhaust gas generated by a direct-burning burner from entering the roll chamber. To provide.
【０００７】[0007]
【課題を解決するための手段】上述した目的は本発明に
よれば、並設された２つの竪型炉体間にまたがって区画
形成されたロール室と、一方の炉体から他方の炉体へと
鋼帯を搬送するための前記ロール室内に回動自在に設け
られた一対のターンロールと、前記鋼帯を加熱するため
に該鋼帯に対向するように前記炉体に設けられた直火バ
ーナとを備える竪型直火加熱炉において、前記ターンロ
ール間の所定の位置に、該ロール室内の雰囲気ガスを熱
交換器を介して前記鋼帯の上下面に向けて吹付ける仕切
装置を備えることを特徴とする竪型直火加熱炉における
炉体仕切装置を提供することにより達成される。SUMMARY OF THE INVENTION According to the present invention, the above-mentioned object is to provide a roll chamber defined between two vertically arranged vertical furnace bodies, and one furnace body to the other furnace body. And a pair of turn rolls rotatably provided in the roll chamber for conveying the steel strip to the furnace, and a straight roll provided in the furnace body so as to face the steel strip to heat the steel strip. In a vertical direct heating furnace equipped with a fire burner, at a predetermined position between the turn rolls, a partition device for blowing the atmospheric gas in the roll chamber toward the upper and lower surfaces of the steel strip via a heat exchanger. The present invention is achieved by providing a furnace body partitioning device in a vertical open-fired heating furnace, which is characterized by including the above.
【０００８】[0008]
【作用】このようにすれば、ロール室内の雰囲気ガスを
熱交換器を介して鋼帯の上下面に向けて吹付けているの
で、ロール室内を通過しようとする流体の流れ、即ち直
火バーナにて発生した高温の排ガスの流れを遮断するこ
とができる。したがって、炉体とロール室とを流体によ
って仕切ることができるため、鋼帯への機械的な接触無
しで排ガスの流れを遮断していることから、シールによ
る鋼帯表面へのキズの発生を防止でき、そしてロール室
内は熱交換器により温度調節された雰囲気ガスによって
常時所定の温度に保つことができる。With this configuration, since the atmospheric gas in the roll chamber is blown toward the upper and lower surfaces of the steel strip through the heat exchanger, the flow of the fluid passing through the roll chamber, that is, the direct burner It is possible to shut off the flow of high-temperature exhaust gas generated in. Therefore, since the furnace body and the roll chamber can be partitioned by the fluid, the flow of exhaust gas is blocked without mechanical contact with the steel strip, preventing the occurrence of scratches on the steel strip surface due to the seal. And, the inside of the roll chamber can be constantly maintained at a predetermined temperature by the atmospheric gas whose temperature is adjusted by the heat exchanger.
【０００９】[0009]
【実施例】以下、本発明の好適実施例を添付の図面につ
いて詳しく説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.
【００１０】図１は、本発明が適用された竪型直火加熱
炉の内部構造の概略を示す図であり、ストリップ１は、
デフレクタロール２を介してシール装置３より加熱炉内
に入り、ターンロール５、６で方向変換され、予備加熱
室７と無酸化炉加熱室８とで形成される屈曲加熱炉４内
を通過する。FIG. 1 is a diagram showing the outline of the internal structure of a vertical direct-fired heating furnace to which the present invention is applied.
It enters into the heating furnace from the sealing device 3 via the deflector roll 2, the direction is changed by the turn rolls 5 and 6, and it passes through the bending heating furnace 4 formed by the preheating chamber 7 and the non-oxidizing furnace heating chamber 8. ..
【００１１】無酸化炉加熱室８には、直火バーナ９が備
えられており、ここで燃焼した排ガスはストリップ１の
進行方向とは逆に無酸化炉加熱室８から煙道１０を通過
して予備加熱室７へ流れ、この予備加熱室７でストリッ
プ１を予備加熱し、最後に煙突１１を経て大気中に排出
される。An open flame burner 9 is provided in the non-oxidizing furnace heating chamber 8, and the exhaust gas burned therein passes through the flue 10 from the non-oxidizing furnace heating chamber 8 in the opposite direction to the traveling direction of the strip 1. To the preheating chamber 7, the strip 1 is preheated in the preheating chamber 7, and finally discharged through the chimney 11 into the atmosphere.
【００１２】予備加熱炉７と無酸化加熱炉８とを跨ぐよ
うにして区画形成されたロール室１２内のターンロール
５、６間の所定の位置には、ストリップ１の図の上下面
に向けて、主に窒素ガスからなる雰囲気ガスを吹付ける
仕切壁１３が設けられている。また、ロール室１２内の
雰囲気ガスは、ダクトを介して雰囲気ガス再循環ライン
１４に流れ、途中の熱交換器１５により冷却し、ブロワ
１６で昇圧してロール室１２内に再び吹込むようにされ
ている。At a predetermined position between the turn rolls 5 and 6 in a roll chamber 12 that is partitioned and formed so as to straddle the preheating furnace 7 and the non-oxidizing heating furnace 8, the strip 1 faces the upper and lower surfaces in the drawing. In addition, a partition wall 13 for spraying an atmosphere gas mainly composed of nitrogen gas is provided. Further, the atmospheric gas in the roll chamber 12 flows into the atmospheric gas recirculation line 14 through the duct, is cooled by the heat exchanger 15 in the middle, is pressurized by the blower 16 and is blown into the roll chamber 12 again. There is.
【００１３】上述のように構成された竪型直火加熱炉で
は、無酸化加熱炉８内の直火バーナ９にて発生した排ガ
スは、ドラフトにより図に矢印Ａで示されるように、煙
道１０を通って予備加熱炉７へ流入していく。そして、
予備加熱炉７の下部に設けられた排気装置を介して煙突
１１より排気される。この際に、大部分の排ガスは煙道
１０を通過するが、一部の排ガスは、ロール室１２を通
過して予備加熱室７へ流入しようとする。しかしなが
ら、ロール室１２内にはストリップの上下面に向けて雰
囲気ガスが吹付ける仕切壁１３が設けられているため、
図に矢印Ｂで示される無酸化加熱炉８からロール室１２
内を通過して予備加熱炉７へと流れる排ガスの流れを遮
断することができる。そして、吹付けられた雰囲気ガス
をダクトを介して吸引し、熱交換器１５により所定の温
度にして再度ブロワ１６により昇圧してロール室１２内
に再循環していることから、ロール室１２内を常に所定
の温度に保つことができる。したがって、排ガスがロー
ル室１２内に侵入しようとしても、予備加熱室７及び無
酸化加熱室８とロール室１２との境界部分には雰囲気ガ
スによる流体シールが存在するため、その侵入が防止さ
れて排ガスは煙道１０へと流れ、しかも、ストリップ１
の通過に伴い温度上昇したロール室１２内の雰囲気ガス
を冷却して再循環してロール室１２内が常時所定温度に
保たれていることから、各ターンロール５、６のヒート
クラウン量がその幅方向の位置により著しく異なること
がなく、ストリップ１にウォークやヒートバックル等の
不具合を生じることがない。In the vertical direct-fired heating furnace configured as described above, the exhaust gas generated in the direct-burning burner 9 in the non-oxidizing heating furnace 8 is flue gas as shown by an arrow A in the figure due to a draft. It flows through 10 into the preheating furnace 7. And
The gas is exhausted from the chimney 11 via an exhaust device provided in the lower portion of the preheating furnace 7. At this time, most of the exhaust gas passes through the flue 10, but some of the exhaust gas tries to flow into the preheating chamber 7 through the roll chamber 12. However, since the partition wall 13 in which the atmospheric gas is blown toward the upper and lower surfaces of the strip is provided in the roll chamber 12,
From the non-oxidizing heating furnace 8 indicated by arrow B in the figure to the roll chamber 12
It is possible to block the flow of the exhaust gas flowing through the inside to the preheating furnace 7. Then, the blown atmospheric gas is sucked through the duct, brought to a predetermined temperature by the heat exchanger 15 and boosted by the blower 16 again to be recirculated in the roll chamber 12, so that the inside of the roll chamber 12 is recirculated. Can always be kept at a predetermined temperature. Therefore, even if the exhaust gas tries to enter the roll chamber 12, there is a fluid seal due to the atmospheric gas at the boundary between the pre-heating chamber 7 and the non-oxidizing heating chamber 8 and the roll chamber 12, so that the invasion is prevented. The exhaust gas flows to the flue 10, and the strip 1
Since the atmospheric gas in the roll chamber 12 whose temperature has risen as it passes through is cooled and recirculated to keep the inside of the roll chamber 12 at a predetermined temperature at all times, the heat crown amounts of the respective turn rolls 5 and 6 are It does not significantly change depending on the position in the width direction, and the strip 1 does not have a problem such as a walk or a heat buckle.
【００１４】また、図に示されるように煙道１０より排
ガスを雰囲気ガス再循環ライン１４に導入することで、
ロール室１２より流出した雰囲気ガスの補給をすると共
に、排ガスの温度を利用してロール室１２内の温度を制
御することができ、例えば、ロール室１２内の温度を適
宜に調整することで、ストリップ１への予熱効果を高め
ることができる。Further, as shown in the figure, by introducing the exhaust gas from the flue 10 into the atmospheric gas recirculation line 14,
The temperature of the roll chamber 12 can be controlled by using the temperature of the exhaust gas while replenishing the atmospheric gas flowing out from the roll chamber 12, and, for example, by appropriately adjusting the temperature of the roll chamber 12, The preheating effect on the strip 1 can be enhanced.
【００１５】上記したように、従来形式の竪型直火加熱
炉にみられた炉体からロール室への排ガスの侵入を防止
するための複雑なシール装置を、流体によるシールを行
うことにより構造を簡素化すると共に、例えば鋼帯への
機械的な接触によるシール装置において発生していたス
トリップ表面のキズは、本発明品では非接触による遮断
を実現可能としているから一切有り得ない。また、ロー
ル室内の雰囲気ガスを再循環するため、特にランニング
コストアップにつながる雰囲気ガスの消費量を大幅に低
減することができることから、連続熱処理設備の稼働コ
ストを低減することができる。As described above, the complicated sealing device for preventing the inflow of exhaust gas from the furnace body into the roll chamber, which is found in the conventional vertical direct-fired heating furnace, is structured by performing fluid sealing. In addition, the scratches on the strip surface, which occur in the sealing device due to mechanical contact with the steel strip, are not possible at all because the product of the present invention can realize non-contact blocking. Further, since the atmosphere gas in the roll chamber is recirculated, the consumption amount of the atmosphere gas, which particularly leads to an increase in running cost, can be significantly reduced, so that the operating cost of the continuous heat treatment equipment can be reduced.
【００１６】[0016]
【発明の効果】以上の説明により明らかなように、本発
明による竪型直火加熱炉における炉体仕切装置によれ
ば、ロール室内の雰囲気ガスを再循環して鋼帯の上下面
に向けて吹付ける仕切装置により、炉体からロール室へ
流れる流体を遮断することができる。したがって、簡単
な構造でロール室内を常時所定温度に保つことができる
ため、これまでのような複雑な仕切装置は不要となり、
設備費を大幅に削減でき、しかも機械的な鋼帯への接触
がないことから、鋼帯表面にはのキズが発生することが
ない。また、ロール室内の雰囲気ガスを再びロール室内
に循環することから、コストの高い雰囲気ガスを有効利
用することができ、ラインの稼働コストを低減すること
ができ、その効果は大である。As is apparent from the above description, according to the furnace body partitioning device in the vertical direct-fired heating furnace according to the present invention, the atmospheric gas in the roll chamber is recirculated toward the upper and lower surfaces of the steel strip. The spraying partition device can shut off the fluid flowing from the furnace body to the roll chamber. Therefore, since the roll chamber can be always kept at a predetermined temperature with a simple structure, a complicated partitioning device as in the past is unnecessary,
Since the equipment cost can be significantly reduced and there is no mechanical contact with the steel strip, no scratches are generated on the surface of the steel strip. Further, since the atmospheric gas in the roll chamber is circulated again in the roll chamber, the costly atmospheric gas can be effectively used, the operating cost of the line can be reduced, and the effect is great.
【図１】本発明が適用された竪型直火加熱炉の概略構成
を示す図である。FIG. 1 is a diagram showing a schematic configuration of a vertical open flame heating furnace to which the present invention is applied.
１ ストリップ ２ デフレクタロール ３ シール装置 ４ 竪型直火加熱炉 ５、６ ターンロール ７ 予備加熱室 ８ 無酸化加熱室 ９ 直火バーナ １０ 煙道 １１ 煙突 １２ ロール室 １３ 仕切壁 １４ 雰囲気ガス再循環ライン １５ 熱交換器 １６ ブロワ 1 strip 2 deflector roll 3 sealing device 4 vertical direct heating furnace 5, 6 turn roll 7 preheating chamber 8 non-oxidizing heating chamber 9 direct fire burner 10 flue 11 chimney 12 roll chamber 13 partition wall 14 atmosphere gas recirculation line 15 Heat exchanger 16 Blower
Claims (1)
て区画形成されたロール室と、 一方の炉体から他方の炉体へと鋼帯を搬送するための前
記ロール室内に回動自在に設けられた一対のターンロー
ルと、 前記鋼帯を加熱するために該鋼帯に対向するように前記
炉体に設けられた直火バーナとを備える竪型直火加熱炉
において、 前記ターンロール間の所定の位置に、該ロール室内の雰
囲気ガスを熱交換器を介して前記鋼帯の上下面に向けて
吹付ける仕切装置を備えることを特徴とする竪型直火加
熱炉における炉体仕切装置。1. A roll chamber partitioned and formed between two vertical furnace bodies arranged in parallel, and a roll chamber for transporting a steel strip from one furnace body to the other furnace body. In a vertical direct-fired heating furnace comprising a pair of rotatably provided turn rolls, and a direct-fire burner provided in the furnace body so as to face the steel strip to heat the steel strip, Furnace in a vertical direct-fired heating furnace, characterized by comprising a partitioning device for blowing atmospheric gas in the roll chamber toward upper and lower surfaces of the steel strip through a heat exchanger at predetermined positions between the turn rolls. Body partition device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4174975A JP2693689B2 (en) | 1992-06-08 | 1992-06-08 | Furnace body partitioning device for vertical open flame heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4174975A JP2693689B2 (en) | 1992-06-08 | 1992-06-08 | Furnace body partitioning device for vertical open flame heating furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05339648A true JPH05339648A (en) | 1993-12-21 |
| JP2693689B2 JP2693689B2 (en) | 1997-12-24 |
Family
ID=15988022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4174975A Expired - Lifetime JP2693689B2 (en) | 1992-06-08 | 1992-06-08 | Furnace body partitioning device for vertical open flame heating furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2693689B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006307244A (en) * | 2005-04-26 | 2006-11-09 | Nippon Steel Corp | Sealing unit and sealing method for cooling process in continuous heat treatment facility for steel strip |
| WO2024056068A1 (en) * | 2022-09-15 | 2024-03-21 | 宝山钢铁股份有限公司 | Jet-type direct-fired preheating system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5354106A (en) * | 1976-10-27 | 1978-05-17 | Nippon Steel Corp | Vertical direct heating furnace |
| JPS63103027A (en) * | 1986-10-20 | 1988-05-07 | Mitsubishi Heavy Ind Ltd | Non-contacting gas sealing apparatus |
-
1992
- 1992-06-08 JP JP4174975A patent/JP2693689B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5354106A (en) * | 1976-10-27 | 1978-05-17 | Nippon Steel Corp | Vertical direct heating furnace |
| JPS63103027A (en) * | 1986-10-20 | 1988-05-07 | Mitsubishi Heavy Ind Ltd | Non-contacting gas sealing apparatus |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006307244A (en) * | 2005-04-26 | 2006-11-09 | Nippon Steel Corp | Sealing unit and sealing method for cooling process in continuous heat treatment facility for steel strip |
| WO2024056068A1 (en) * | 2022-09-15 | 2024-03-21 | 宝山钢铁股份有限公司 | Jet-type direct-fired preheating system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2693689B2 (en) | 1997-12-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6652681B2 (en) | Method of reheating metallurgical products | |
| GB1601052A (en) | Furnaces | |
| US4691898A (en) | Continuous annealing furnace for metallic strip | |
| JP2693689B2 (en) | Furnace body partitioning device for vertical open flame heating furnace | |
| EP0233944B1 (en) | Continuous strip steel processing line having direct firing furnace | |
| JPH10183258A (en) | Device for controlling gas flow | |
| WO2019221496A1 (en) | Atmospheric gas sealing means for continuous-thermal treatment furnace and control method therefor | |
| KR101150371B1 (en) | Bright annealin gfurnace including gas blocking member | |
| JP4069642B2 (en) | Horizontal furnace for continuous strip annealing | |
| US3035824A (en) | Furnace with cooled and recirculated atmosphere | |
| JPH09272919A (en) | Continuous heating method and apparatus therefor | |
| JPH04124585A (en) | Cooling device utilizing nitrogen gas for continuous furnace | |
| JP4752526B2 (en) | Continuous heating furnace and control method thereof | |
| JP3143937B2 (en) | Continuous annealing furnace | |
| JPH09170749A (en) | Heating furnace and its operating method | |
| JPH08291329A (en) | Continuous heating method | |
| JPH0693341A (en) | Continuous heat treatment method for steel strip | |
| EP0372128A1 (en) | Tunnel kilns | |
| KR20140057129A (en) | Method for manufacturing steel plate | |
| JPH0551644B2 (en) | ||
| JPH03260023A (en) | Continuous annealing furnace of sheet metal | |
| JPS6029426A (en) | Device for controlling temperature in roll chamber of vertical type plural pass direct-firing heating furnace | |
| JPS6176610A (en) | Operating method of continuous heat treating furnace | |
| KR20040032426A (en) | An apparatus for preventing the difference of temperature of strip in heating furnace | |
| JPH08176679A (en) | Continuous heating of steel strip and device therefor |
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: 19970819 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313122 |
|
| R371 | Transfer withdrawn |
Free format text: JAPANESE INTERMEDIATE CODE: R371 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313121 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20070905 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080905 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090905 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100905 Year of fee payment: 13 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110905 Year of fee payment: 14 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110905 Year of fee payment: 14 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120905 Year of fee payment: 15 |
|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120905 Year of fee payment: 15 |