JPH10121151A - Method for restraining contamination in continuous heat treatment furnace - Google Patents
Method for restraining contamination in continuous heat treatment furnaceInfo
- Publication number
- JPH10121151A JPH10121151A JP26839996A JP26839996A JPH10121151A JP H10121151 A JPH10121151 A JP H10121151A JP 26839996 A JP26839996 A JP 26839996A JP 26839996 A JP26839996 A JP 26839996A JP H10121151 A JPH10121151 A JP H10121151A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- steel strip
- gas
- cooling
- soaking
- 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.)
- Withdrawn
Links
Landscapes
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明方法は、連続熱処理炉
の炉内汚れ抑制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 suppressing contamination in a continuous heat treatment furnace.
【０００２】[0002]
【従来の技術】冷間圧延後の鋼帯は、周知のごとく加熱
炉、均熱炉及び冷却炉からなる連続熱処理炉へ導き、鋼
帯の熱処理（焼鈍）を施して軟質化し、鋼帯の加工性を
付与するものである。2. Description of the Related Art As is well known, a steel strip after cold rolling is led to a continuous heat treatment furnace comprising a heating furnace, a soaking furnace and a cooling furnace, where the steel strip is heat-treated (annealed) to be softened. It imparts processability.
【０００３】[0003]
【発明が解決しようとする課題】上記のごとき、鋼帯の
連続熱処理においては、冷間圧延時の圧延油が鋼帯表面
に付着しており、この付着圧延油が主として加熱炉の高
温下で分解してＣＯガスが加熱炉の雰囲気ガス中へ含有
し、鋼帯の通板により随伴して均熱炉へ流入するととも
に、更に均熱炉で鋼帯に残留する若干の圧延油がＣＯガ
ス化して、ＣＯガス含有雰囲気ガスとなる。特に、鋼帯
熱処理の生産性を向上するため高速通板すると、圧延油
の炉内持ち込み量が多くなり、均熱炉内等の雰囲気ガス
中のＣＯガス濃度がより高濃度になる。このようなＣＯ
ガス含有雰囲気ガスが通板鋼帯に随伴されて冷却炉へ流
入することになり、冷却炉で冷却され雰囲気ガス中のＣ
Ｏガスが炭化物となり、冷却炉内壁に煤となって付着し
て汚れが発生し、これが徐々に堆積し剥離脱落して通板
中（熱処理中）の鋼帯に付着して品質を劣化させるこに
なる。このような難点を回避するためには、定期的に操
業を停止して冷却炉内に付着堆積した煤を除去すること
になり、操業停止にともなう稼働率が低下（生産性の低
下）する課題がある。本発明方法は、このような課題を
有利に解決するためなされたものであり、連続熱処理炉
の均熱炉と冷却炉間のスロート部で通板中の鋼帯表裏面
に不活性ガスを吹き付けることにより、ＣＯガス含有雰
囲気ガスの冷却炉への流入を抑制し、冷却炉内壁への煤
（炭化物）付着による汚れを抑制する方法を提供するこ
とを目的とするものである。As described above, in the continuous heat treatment of the steel strip, the rolling oil during cold rolling adheres to the surface of the steel strip, and this adhered rolling oil is mainly deposited at a high temperature of a heating furnace. The CO gas is decomposed and contained in the atmosphere gas of the heating furnace. The gas passes through the steel strip and flows into the soaking furnace, and the rolling oil remaining in the steel strip in the soaking furnace further reduces CO gas. Into an atmosphere gas containing CO gas. In particular, when high-speed sheet passing is performed to improve the productivity of the steel strip heat treatment, the amount of rolling oil brought into the furnace increases, and the CO gas concentration in the atmosphere gas such as in the soaking furnace becomes higher. Such a CO
The gas-containing atmosphere gas flows into the cooling furnace accompanying the strip steel strip, and is cooled by the cooling furnace to remove the C in the atmosphere gas.
O gas becomes carbide and becomes soot on the inner wall of the cooling furnace and adheres to it, producing dirt. This gradually accumulates, peels off, falls off, and adheres to the steel strip in the passing plate (during heat treatment) to deteriorate the quality. become. In order to avoid such difficulties, the operation is periodically stopped to remove soot that has adhered and accumulated in the cooling furnace, and the operation rate due to the operation stop is reduced (productivity is reduced). There is. The method of the present invention has been made to solve such a problem advantageously, and an inert gas is sprayed on the front and back surfaces of a steel strip during passing at a throat portion between a soaking furnace and a cooling furnace of a continuous heat treatment furnace. Accordingly, it is an object of the present invention to provide a method of suppressing the flow of the CO gas-containing atmosphere gas into the cooling furnace and suppressing the contamination due to the adhesion of soot (carbide) to the cooling furnace inner wall.
【０００４】[0004]
【課題を解決するための手段】本発明方法の特徴とする
ところは、連続熱処理炉の均熱炉と冷却炉間のスロート
部で、通板中の鋼帯表裏面へ鋼帯通板方向に対向して不
活性ガスを吹き付け、均熱炉内雰囲気ガスの冷却炉への
流入を抑制することを特徴とする連続熱処理炉の炉内汚
れ抑制方法。及び連続熱処理炉の均熱炉と冷却炉間のス
ロート部に一対の隔壁を設け、この隔壁間で通板中の鋼
帯表裏面へ鋼帯通板方向に対向して不活性ガスを吹き付
け、均熱炉内雰囲気ガスの冷却炉への流入を抑制するこ
とを特徴とする連続熱処理炉の炉内汚れ抑制方法。及び
連続熱処理炉の均熱炉と冷却炉間のスロート部に一対の
隔壁を設け、この隔壁間の前段隔壁鋼帯出側近傍から隔
壁の鋼帯通過間隙へ向って、通板中の鋼帯表裏面へ鋼帯
通板方向に対向して不活性ガスを吹き付け、均熱炉内雰
囲気ガスの冷却炉への流入を抑制することを特徴とする
連続熱処理炉の炉内汚れ抑制方法である。A feature of the method of the present invention is that a throat portion between a soaking furnace and a cooling furnace of a continuous heat treatment furnace is applied to a front side and a back side of a steel strip in the passing direction in the direction of the passing direction of the steel strip. A method for suppressing in-furnace contamination of a continuous heat treatment furnace, wherein an inert gas is sprayed oppositely to suppress the inflow of atmospheric gas in the soaking furnace into the cooling furnace. And a pair of partitions are provided at the throat portion between the soaking furnace and the cooling furnace of the continuous heat treatment furnace, and an inert gas is blown between the partition walls on the front and back surfaces of the steel strip during the passing in the steel strip passing direction, A method for suppressing in-furnace contamination of a continuous heat treatment furnace, characterized by suppressing inflow of atmospheric gas in a soaking furnace into a cooling furnace. A pair of partitions is provided at the throat portion between the soaking furnace and the cooling furnace of the continuous heat treatment furnace. This is a method for suppressing in-furnace contamination in a continuous heat treatment furnace, which comprises blowing an inert gas against the back surface in the steel strip passing direction to suppress the flow of atmospheric gas in the soaking furnace into the cooling furnace.
【０００５】[0005]
【発明の実施の形態】上記のごとき、連続熱処理炉の均
熱炉と冷却炉間のスロート部で、通板中の鋼帯に吹き付
ける不活性ガスとしては、一般に炉内雰囲気ガスは、Ｈ
2 ガス約１０％、残りＮ2 ガスからなっており、従って
Ｎ2 ガスを用いることが好ましい。不活性ガスの吹き付
けは、一般に配設しているスロート部高さ（８００〜９
００ｍｍ）であれば、鋼帯の進行方向（通板方向）に対
して３０〜６０°の吹き付け角度、流量１０〜３００Ｎ
ｍ3 ／ｈ、ガス吹き付けノズルと鋼帯距離７０〜１２０
ｍｍ、吹き付け圧力０．１〜０．５ＭＰａで、確実に鋼
帯が随伴する均熱炉内のＣＯガス含有雰囲気ガスの冷却
炉内への流入を抑制して、冷却炉内での雰囲気ガス中の
ＣＯガス冷却による炭化物の発生を抑え、冷却炉内壁へ
の堆積を抑制するものである。BEST MODE FOR CARRYING OUT THE INVENTION As described above, in the throat section between a soaking furnace and a cooling furnace of a continuous heat treatment furnace, as an inert gas blown to a steel strip in a sheet passing, generally, an atmosphere gas in the furnace is H
About 2 % of the two gases are composed of the remaining N 2 gas. Therefore, it is preferable to use the N 2 gas. The inert gas is blown at the height of the throat part generally provided (800 to 9).
00 mm), a spray angle of 30 to 60 ° and a flow rate of 10 to 300 N with respect to the traveling direction (passing direction) of the steel strip.
m 3 / h, distance between gas spray nozzle and steel strip 70-120
mm, with a spray pressure of 0.1 to 0.5 MPa, the CO gas-containing atmosphere gas in the soaking furnace, which is accompanied by a steel strip, is reliably prevented from flowing into the cooling furnace. The generation of carbides due to the cooling of the CO gas is suppressed, and the deposition on the inner wall of the cooling furnace is suppressed.
【０００６】また、高温の不活性ガス吹き付けにより、
鋼帯の急冷による形状が悪化（ヒートバックル）するの
を防止して以降の炉内搬送ロール位置での蛇行を防ぎ、
鋼帯巾方向両端部の擦疵発生をすることが好ましく。吹
き付け不活性ガス温度としては、２００℃以上で冷却炉
入側温度（約６００℃）以下が好適である。このような
不活性ガス温度に調整する方法としては、例えば均熱炉
内へガス導管を配置して不活性ガスを均熱炉内経由でス
ロート部ガスノズルへ供給し、均熱炉内熱と熱交換して
高温に調整することによって、コスト的に有利に温度調
整することができる。Further, by blowing a high-temperature inert gas,
Prevents deterioration of the shape (heat buckle) due to rapid cooling of the steel strip and prevents meandering at the position of the transfer rolls in the furnace after that,
It is preferable that scratches occur at both ends in the width direction of the steel strip. The temperature of the sprayed inert gas is preferably not lower than 200 ° C. and not higher than the cooling furnace inlet side temperature (about 600 ° C.). As a method of adjusting the temperature of the inert gas, for example, a gas conduit is arranged in the soaking furnace, the inert gas is supplied to the throat section gas nozzle via the soaking furnace, and the heat in the soaking furnace is reduced. By exchanging and adjusting to a high temperature, the temperature can be adjusted advantageously in terms of cost.
【０００７】このように均熱炉と冷却炉のスロート部で
通板中の鋼帯に不活性ガスを吹き付け、均熱炉内のＣＯ
ガス含有雰囲気ガスの冷却炉内への流入を抑制する他、
例えばスロート部に一対の隔壁を設け、この隔壁間で上
記のごとく不活性ガスを投入することにより、炉内雰囲
気ガスの冷却炉への流入を抑制することができる。As described above, the inert gas is blown onto the steel strip passing through the throat portions of the soaking furnace and the cooling furnace, and the CO in the soaking furnace is blown.
In addition to suppressing the flow of gas-containing atmosphere gas into the cooling furnace,
For example, by providing a pair of partition walls in the throat portion and supplying the inert gas between the partition walls as described above, it is possible to suppress the in-furnace atmosphere gas from flowing into the cooling furnace.
【０００８】この他、上記のごとく一対の隔壁間の前段
隔壁（鋼帯進行方向入側隔壁の鋼帯出側（隔壁内）近傍
から隔壁の鋼帯通過間隙部の鋼帯表裏面へ向け、不活性
ガスを吹き付けることにより、鋼帯が随伴する（特に鋼
帯表面付近で随伴する）均熱炉のＣＯガス含有雰囲気ガ
ス、即ち境界層流れを隔壁の鋼帯通過間隙部から均熱炉
へ剥離拡散して押し戻し、一層確実に冷却炉へのＣＯガ
ス含有雰囲気ガスの流入を抑制することができる。In addition, as described above, the front partition wall between the pair of partition walls (from the vicinity of the steel strip exit side (inside of the partition wall) of the partition wall on the entrance side in the traveling direction of the steel strip) is directed toward the front and back surfaces of the steel strip in the steel strip passage gap of the partition wall. By spraying the active gas, the CO gas-containing atmosphere gas of the soaking furnace accompanied by the steel strip (especially near the steel strip surface), that is, the boundary layer flow is separated from the steel strip passing gap of the partition wall into the soaking furnace. It diffuses and pushes back, so that the inflow of the CO gas-containing atmosphere gas into the cooling furnace can be suppressed more reliably.
【０００９】このようにして、均熱炉内のＣＯガス含有
雰囲気ガスが冷却炉内へ流入することを抑制し、冷却炉
内雰囲気ガス中のＣＯガス濃度の上昇を抑えることによ
って、冷却炉内壁への炭化物付着による汚れを抑制する
ものであるが、冷却炉内雰囲気ガス中のＣＯガス濃度と
しては、冷却炉炉温等によって若干異なるが、一般に使
用されている連続熱処理炉の冷却炉炉温６００〜１５０
℃の場合には、冷却炉内雰囲気ガス中のＣＯガス濃度を
３００ＰＰｍ以下にすることによって、炭化物の冷却炉
内壁への付着堆積による汚れを著しく抑制することがで
き、上記のごとき本発明方法によって、確実に冷却炉内
雰囲気ガス中のＣＯガス濃度を３００ＰＰｍ以下にする
ことができる。In this way, the CO gas-containing atmosphere gas in the soaking furnace is suppressed from flowing into the cooling furnace, and the rise in the CO gas concentration in the cooling furnace atmosphere gas is suppressed. Although the concentration of CO gas in the atmosphere gas in the cooling furnace slightly varies depending on the temperature of the cooling furnace, the temperature of the cooling furnace of a generally used continuous heat treatment furnace is controlled. 600-150
In the case of ° C., by setting the CO gas concentration in the atmosphere gas in the cooling furnace to 300 PPm or less, it is possible to significantly suppress the contamination due to the adhesion and deposition of carbides on the inner wall of the cooling furnace. In addition, the CO gas concentration in the atmosphere gas in the cooling furnace can be reliably reduced to 300 PPm or less.
【００１０】次に、本発明方法の一例を図面によって説
明する。図１において、加熱炉１、均熱炉２及び徐冷炉
３と急冷炉４からなる冷却炉５を連設した連続熱処理炉
６の均熱炉２と均熱炉５間のスロート部７へ不活性ガス
導管８を均熱炉２内を経由して配置し、この不活性ガス
導管８の先端にガスノズル９、９ａを設け、鋼帯１０進
行方向に対向せしめて鋼帯の表裏面へ指向配置すし、通
板鋼帯１０に不活性ガスを吹き付け、鋼帯１０が随伴す
る均熱炉２内のＣＯガス含有雰囲気ガスをシールして冷
却炉５内への流入を抑制して、冷却炉５内でのＣＯガス
冷却による発生炭化物（煤）１１の冷却炉５内壁への付
着を抑制するものである。鋼帯１０への吹き付け不活性
ガスは、均熱炉２の不活性ガス導管８を通過するとき、
均熱炉２内熱により加熱し高温にしてガスノズル９、９
ａから鋼帯１０へ吹き付け、鋼帯１０の急冷による形状
悪化を防止して、以降の搬送ロール１２位置での蛇行を
防止することによって、鋼帯１０巾方向両端部の疵発生
を防止する。Next, an example of the method of the present invention will be described with reference to the drawings. In FIG. 1, a heating furnace 1, a soaking furnace 2, and a cooling furnace 5 composed of an annealing furnace 3 and a quenching furnace 4, which are connected in series, are inert to a throat portion 7 between the soaking furnace 2 and the soaking furnace 5. The gas conduit 8 is disposed inside the soaking furnace 2, and gas nozzles 9 and 9 a are provided at the tip of the inert gas conduit 8 so as to face the steel strip 10 in the traveling direction so as to be directed to the front and back surfaces of the steel strip. An inert gas is blown to the steel strip 10 to seal the CO-containing atmosphere gas in the soaking furnace 2 accompanied by the steel strip 10 to suppress the inflow into the cooling furnace 5. This suppresses the adhesion of the carbide (soot) 11 generated by the CO gas cooling to the inner wall of the cooling furnace 5. When the inert gas sprayed on the steel strip 10 passes through the inert gas conduit 8 of the soaking furnace 2,
Gas nozzles 9 and 9
a, the shape of the steel strip 10 is prevented from deteriorating due to quenching, and the meandering at the position of the transport roll 12 is prevented, thereby preventing the occurrence of flaws at both ends in the width direction of the steel strip 10.
【００１１】上記のごとく、均熱炉と冷却炉間のスロー
ト部での不活性ガス吹き付けによる均熱炉からのＣＯガ
ス含有雰囲気ガスの流入を抑制する具体例を挙げる。図
２（イ）に示すごとく、ガスノズル９、９ａから鋼帯１
０進行方向に対向して不活性ガスを吹き付け、鋼帯１０
が随伴する均熱炉２内のＣＯガス含有雰囲気ガスをシー
ルする。また、図２の（ロ）に示すごとく、スロート部
７に仕切り壁１３、１３ａからなる隔壁１４と、仕切り
壁１３ｂ、１３ｃからなる隔壁１４ａの一対配設し、こ
の隔壁１４、１４ａ間の後段隔壁１４ａ（鋼帯１０進行
方向出側隔壁１４ａ）の鋼帯１０入側からガスノズル
９、９ａにより不活性ガスを投入し、隔壁１４とガスノ
ズル９、９ａ間のガス圧を高めて、スロート部７内で均
熱炉２内からのＣＯガス含有雰囲気ガスをシールして冷
却炉５への流入を抑制する。更に、図２の（ハ）に示す
ごとく、前段隔壁１４の鋼帯１０出側近傍でガスノズル
９、９ａから鋼帯１０進行方向に対向して、隔壁１４の
鋼帯１０通過間隙に向って不活性ガスを吹き付け、鋼帯
１０が随伴する鋼帯１０近傍の均熱炉２内からのＣＯガ
ス含有雰囲気ガス、即ち境界層流れを剥離拡散して押し
戻すことによって、シールし冷却炉５への流入を抑制す
る。As described above, a specific example of suppressing the flow of the atmosphere gas containing CO gas from the soaking furnace by blowing the inert gas at the throat portion between the soaking furnace and the cooling furnace will be described. As shown in FIG. 2 (a), the steel strip 1 is connected to the gas nozzles 9, 9a.
0 Inert gas is blown against the steel strip 10
Seals the atmosphere gas containing CO gas in the heat equalizing furnace 2 accompanied by. Further, as shown in FIG. 2B, a pair of a partition wall 14 composed of the partition walls 13 and 13a and a partition wall 14a composed of the partition walls 13b and 13c are disposed in the throat portion 7, and a subsequent stage between the partition walls 14 and 14a. An inert gas is introduced from the inlet side of the steel strip 10 of the partition wall 14a (the exit side wall 14a in the traveling direction of the steel strip 10) by the gas nozzles 9 and 9a, and the gas pressure between the partition wall 14 and the gas nozzles 9 and 9a is increased. The CO-containing atmosphere gas from inside the soaking furnace 2 is sealed in the inside to suppress the inflow into the cooling furnace 5. Further, as shown in FIG. 2C, the gas nozzles 9 and 9a face the steel strip 10 in the advancing direction in the vicinity of the steel strip 10 exit side of the former partition wall 14 and are not directed toward the steel strip 10 passage gap of the partition wall 14. An active gas is sprayed to peel and diffuse and push back the CO-containing atmosphere gas, ie, the boundary layer flow, from inside the soaking furnace 2 near the steel strip 10 accompanied by the steel strip 10, thereby sealing and flowing into the cooling furnace 5. Suppress.
【００１２】[0012]
【実施例】次に、本発明方法の実施例を比較例とともに
挙げる。Next, examples of the method of the present invention will be described together with comparative examples.
【表１】 [Table 1]
【００１３】[0013]
【表２】（表１の続き） [Table 2] (Continuation of Table 1)
【００１４】[0014]
【表３】（表２の続き） [Table 3] (Continuation of Table 2)
【００１５】注１：連続熱処理炉は、一般に使用されて
いる加熱炉、均熱炉及び冷却炉（徐冷炉と急冷炉）から
なり、各炉内雰囲気ガスは、Ｈ2 ガス８％、残りＮ2 ガ
スを使用し、板幅７００〜１０００ｍｍ、板厚０．１５
〜０．４ｍｍに冷間圧延でハーム系圧延油を用いて圧延
した極低炭素鋼帯を熱処理した。 注２：各炉の在炉時間は、鋼帯の熱処理在炉時間。 注３：スロート部吹き付けガスは、Ｎ2 ガスを使用。 注４：ガス吹き付け角度は、鋼帯進行方向への対向角
度。 注５：ガス吹き付け距離は、ガス吹き付けノズルと鋼帯
間距離。 注６：ガス吹き付け位置のＡは、均熱炉と冷却炉間のス
ロート部で鋼帯表裏面にガスを吹き付けた。Ｂは、図２
（ロ）に示すごとき後段隔壁１４ａの鋼帯入側から鋼帯
表裏面へガスを吹き付けた。Ｃは、図２（ハ）に示すご
とき前段隔壁１４の鋼帯出側近傍で隔壁１４の鋼帯１０
通過間隙へ向って、鋼帯表裏面へガスを吹き付けた。 注７：ガス吹き付けノズルは、鋼帯巾方向５０ｍｍピッ
チで孔径３ｍｍ。 注８：隔壁は、図２（ロ）、（ハ）に示すごとくスロー
ト部（高さ８２０ｍｍ）に上部仕切り壁高さ３４０ｍ
ｍ、下部仕切り壁高さ３１０ｍｍからなる隔壁を間隔１
７０ｍｍで隔壁一対を配設した。 注９：煤除去間隔は、冷却炉内壁へ煤が付着堆積し、除
去した間隔（期間）。Note 1: The continuous heat treatment furnace is composed of generally used heating furnace, soaking furnace and cooling furnace (slow cooling furnace and quenching furnace), and the atmosphere gas in each furnace is 8% H 2 gas and the remaining N 2 gas. Using gas, plate width 700 to 1000 mm, plate thickness 0.15
The ultra-low carbon steel strip rolled by cold rolling to ０．４0.4 mm using harm-based rolling oil was heat-treated. Note 2: In-furnace time in each furnace is the time in heat treatment of steel strip. Note 3: throat blowing gas, using N 2 gas. Note 4: The gas spraying angle is the angle facing the steel strip traveling direction. Note 5: The gas spray distance is the distance between the gas spray nozzle and the steel strip. Note 6: In the gas spraying position A, gas was sprayed on the front and back surfaces of the steel strip at the throat portion between the soaking furnace and the cooling furnace. B is FIG.
As shown in (b), gas was blown to the front and back surfaces of the steel strip from the steel strip entry side of the latter partition wall 14a. C is the steel strip 10 of the bulkhead 14 near the steel strip exit side of the former bulkhead 14 as shown in FIG.
Gas was blown to the front and back surfaces of the steel strip toward the passage gap. Note 7: The gas spray nozzle has a hole diameter of 3 mm at a pitch of 50 mm in the width direction of the steel strip. Note 8: As shown in FIGS. 2 (b) and (c), the partition wall is 340m high at the throat (height: 820mm).
m, partition walls consisting of a lower partition wall height of 310 mm and an interval of 1
A pair of partition walls was provided at 70 mm. Note 9: The soot removal interval is the interval (period) during which soot adhered and accumulated on the inner wall of the cooling furnace and was removed.
【００１６】[0016]
【発明の効果】本発明方法によれば、連続熱処理炉の冷
却炉内壁への炭化物（煤）堆積による汚れを著しく抑制
することができ、炭化物除去による連続熱処理炉の稼働
率を向上し、生産性を高めることができる。また、炭化
物除去の間隔が長期になることから、炭化物除去のコス
ト（人手等）を軽減することができる等の優れた効果が
得られる。According to the method of the present invention, fouling due to the accumulation of carbides (soot) on the inner wall of the cooling furnace of the continuous heat treatment furnace can be remarkably suppressed, and the operation rate of the continuous heat treatment furnace by removing the carbides can be improved to improve the production efficiency. Can be enhanced. In addition, since the intervals of carbide removal are long, excellent effects such as reduction of the cost of removing carbides (manually) can be obtained.
【図１】本発明方法の一例を示す側面図である。FIG. 1 is a side view showing an example of the method of the present invention.
【図２】ガスシールの一例を示す側面図である。FIG. 2 is a side view showing an example of a gas seal.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 満武 和夫 愛知県東海市東海町５−３ 新日本製鐵株 式会社名古屋製鐵所内 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kazuo Manbu 5-3 Tokai-cho, Tokai-shi, Aichi Prefecture Nippon Steel Corporation Nagoya Works
Claims (5)
ート部で、通板中の鋼帯表裏面へ鋼帯通板方向に対向し
て不活性ガスを吹き付け、均熱炉内雰囲気ガスの冷却炉
への流入を抑制することを特徴とする連続熱処理炉の炉
内汚れ抑制方法。An inert gas is blown at a throat portion between a soaking furnace and a cooling furnace of a continuous heat treatment furnace so that an inert gas is blown to the front and back surfaces of the steel strip in the passing in the steel strip passing direction. A method for suppressing in-furnace contamination of a continuous heat treatment furnace, comprising suppressing gas from flowing into a cooling furnace.
ート部に一対の隔壁を設け、この隔壁間で通板中の鋼帯
表裏面へ鋼帯通板方向に対向して不活性ガスを吹き付
け、均熱炉内雰囲気ガスの冷却炉への流入を抑制するこ
とを特徴とする連続熱処理炉の炉内汚れ抑制方法。2. A pair of partition walls are provided in a throat portion between a soaking furnace and a cooling furnace of a continuous heat treatment furnace, and between the partition walls, the front and back surfaces of a steel strip being passed are opposed to each other in a steel strip passing direction and are inactive. A method for suppressing contamination in a furnace of a continuous heat treatment furnace, which comprises blowing a gas to suppress a flow of atmospheric gas in the soaking furnace into a cooling furnace.
ート部に一対の隔壁を設け、この隔壁間の前段隔壁鋼帯
出側近傍から隔壁の鋼帯通過間隙へ向って、通板中の鋼
帯表裏面へ鋼帯通板方向に対向して不活性ガスを吹き付
け、均熱炉内雰囲気ガスの冷却炉への流入を抑制するこ
とを特徴とする連続熱処理炉の炉内汚れ抑制方法。3. A pair of partition walls are provided at a throat portion between a soaking furnace and a cooling furnace of a continuous heat treatment furnace, and a portion between the partition walls near a steel strip exit side of a former partition wall and a gap passing through a steel strip of the partition walls. A method for suppressing in-furnace contamination in a continuous heat treatment furnace, characterized in that an inert gas is blown against the front and back surfaces of the steel strip in the steel strip passing direction so as to suppress the inflow of atmospheric gas in the soaking furnace into the cooling furnace. .
ことを特徴とする請求項１または請求項２または請求項
３に記載の連続熱処理炉の炉内汚れ抑制方法。4. The method according to claim 1, wherein an inert gas having a temperature of 200 ° C. or higher is blown.
を３００ＰＰｍ以下にすることを特徴とする請求項１ま
たは請求項２または請求項３または請求項４に記載の連
続熱処理炉の炉内汚れ抑制方法。5. The furnace of the continuous heat treatment furnace according to claim 1, wherein the CO gas concentration in the atmosphere gas in the cooling furnace is set to 300 PPm or less. Dirt control method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26839996A JPH10121151A (en) | 1996-10-09 | 1996-10-09 | Method for restraining contamination in continuous heat treatment furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26839996A JPH10121151A (en) | 1996-10-09 | 1996-10-09 | Method for restraining contamination in continuous heat treatment furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10121151A true JPH10121151A (en) | 1998-05-12 |
Family
ID=17457945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26839996A Withdrawn JPH10121151A (en) | 1996-10-09 | 1996-10-09 | Method for restraining contamination in continuous heat treatment furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10121151A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8850715B2 (en) * | 2006-09-07 | 2014-10-07 | Eisenmann Ag | Process and installation for drying articles |
-
1996
- 1996-10-09 JP JP26839996A patent/JPH10121151A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8850715B2 (en) * | 2006-09-07 | 2014-10-07 | Eisenmann Ag | Process and installation for drying articles |
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| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
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