JPH0472021A - Continuous bright annealing method for stainless steel strip - Google Patents
Continuous bright annealing method for stainless steel stripInfo
- Publication number
- JPH0472021A JPH0472021A JP18257390A JP18257390A JPH0472021A JP H0472021 A JPH0472021 A JP H0472021A JP 18257390 A JP18257390 A JP 18257390A JP 18257390 A JP18257390 A JP 18257390A JP H0472021 A JPH0472021 A JP H0472021A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- atmospheric gas
- steel strip
- stainless steel
- heating zone
- 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
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 32
- 239000010935 stainless steel Substances 0.000 title claims abstract description 32
- 238000000137 annealing Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 43
- 239000000843 powder Substances 0.000 claims abstract description 32
- 238000001816 cooling Methods 0.000 claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 abstract description 15
- 239000010959 steel Substances 0.000 abstract description 15
- 238000011109 contamination Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 78
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 14
- 229910052802 copper Inorganic materials 0.000 description 14
- 239000010949 copper Substances 0.000 description 14
- 238000007789 sealing Methods 0.000 description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 241001248531 Euchloe <genus> Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、ステンレス鋼帯の連続光輝焼鈍方法に関する
もので、特に銅帯表面の斑点状汚れ発生を低減すること
のできる連続光輝焼鈍方法に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a continuous bright annealing method for stainless steel strips, and particularly to a continuous bright annealing method that can reduce the occurrence of speckled stains on the surface of a copper strip. It is something.
［従来の技術］
ステンレス鋼帯の連続光輝焼鈍では、焼鈍中に銅帯表面
か酸化することを防止する目的て、アンモニア分解ガス
等の還元性ガスを雰囲気ガスとして焼鈍炉内へ供給して
おり、供給された雰囲気ガスは、炉内にて発生する水分
により汚染され、徐々にその還元力を弱め（Ｐ ／
Ｐ＋＋２か大となるＰ 水蒸気分圧、Ｐ）１２水素分
圧）た１フエルトあるいはシールロール等て外気と遮断
されている炉入口シール部及び炉出口シール部より炉外
に放出される。[Prior art] In continuous bright annealing of stainless steel strips, a reducing gas such as ammonia decomposition gas is supplied as an atmosphere gas into the annealing furnace in order to prevent the surface of the copper strip from oxidizing during annealing. , the supplied atmospheric gas is contaminated by moisture generated in the furnace, gradually weakening its reducing power (P /
P (water vapor partial pressure, P) 12 (hydrogen partial pressure), which is larger than P++2, is released from the furnace through the furnace inlet seal and furnace outlet seal, which are isolated from the outside air using felts or seal rolls.
従来、この雰囲気ガスの焼鈍炉内への供給方法としては
、雰囲気ガスの還元力のイ〕効利用［、焼鈍される銅帯
表面の酸化反応か最も発生しやすい加熱帯後半部あるい
は冷却帯にその大半を供給する方法が採用されている。Conventionally, the method for supplying this atmospheric gas into the annealing furnace was to take advantage of the reducing power of the atmospheric gas [in the latter half of the heating zone or in the cooling zone, where oxidation reaction on the surface of the copper strip to be annealed is most likely to occur. The method of supplying most of it is adopted.
この方法の場合、炉入口シール部及び炉出口シール部よ
り炉外へ放出される雰囲気ガス量がほぼ等量である為、
加熱帯後半部あるいは冷却帯に供給された雰囲気ガスの
内、炉出口シール部よりの雰囲気ガス放出量に相当する
雰囲気ガスは、炉出口シール部に向って流れるか、炉出
口シール部よりの放出量を上回る残りの雰囲気ガスは加
熱帯内を炉入口シール部へ向って流れ、例えば「特公昭
５７−３７３３号公報」にも記されている通り、加熱帯
人口部に銅帯の進行方向と逆方向の雰囲気ガス流れを形
成する。In this method, the amount of atmospheric gas released from the furnace inlet seal and the furnace outlet seal to the outside of the furnace is approximately equal;
Among the atmospheric gases supplied to the latter half of the heating zone or the cooling zone, the amount of atmospheric gas equivalent to the amount of atmospheric gas released from the furnace exit sealing section either flows toward the furnace exit sealing section or is released from the furnace exit sealing section. The remaining atmospheric gas that exceeds the amount flows in the heating zone toward the furnace inlet seal, and as described in, for example, ``Special Publication No. 57-3733,'' the remaining atmospheric gas flows in the heating zone in the direction of travel of the copper strip. Create an atmospheric gas flow in the opposite direction.
［発明か解決しようとする課題］
前記従来技術においては、加熱帯入口部の雰囲気ガス流
れの方向か、焼鈍されるステンレス鋼帯の進行方向と逆
方向である。この為、ステンレス鋼帯の光輝焼鈍炉に特
有の加熱帯にて発生する白粉か、この雰囲気ガス流れに
のって炉導入部方向ｔ＼運ばれて焼鈍前の銅帯に付着す
る結果、焼鈍後の銅帯表面に斑点状イリれが発生すると
いう問題か生しる。[Problems to be Solved by the Invention] In the prior art described above, the flow direction of the atmospheric gas at the inlet of the heating zone is the direction opposite to the direction of movement of the stainless steel strip to be annealed. For this reason, the white powder generated in the heating zone peculiar to the bright annealing furnace for stainless steel strips is carried by the atmospheric gas flow in the direction of the furnace introduction section t\ and adheres to the copper strip before annealing. This may lead to the problem of spotty blemishes occurring on the surface of the copper strip afterward.
本発明は、この斑点状汚れ発生の低減を目的とする。The present invention aims to reduce the occurrence of this spotty stain.
［課題を解決するための手段］
本発明の要旨は、ステンレス鋼帯の連続光輝焼鈍におい
て、加熱帯あるいは冷却帯より一旦炉外へ吸引した雰囲
気ガスを炉導入部へ再び供給する炉外雰囲気ガス流れ軒
路を設けることにより、加熱帯人口部の雰囲気ガスの流
れ方向を焼鈍されるステンレス鋼帯の進行方向と同一方
向とすることを特徴とし、これにより焼鈍後の銅帯表面
の斑点状汚れ発生を低減するものである。[Means for Solving the Problems] The gist of the present invention is to provide an external atmosphere gas that is once sucked out of the furnace from a heating zone or a cooling zone and is supplied back to the furnace introduction section in continuous bright annealing of a stainless steel strip. By providing a flowing eaves path, the flow direction of the atmospheric gas in the heating zone population is made to be the same direction as the advancing direction of the stainless steel strip to be annealed. This is to reduce the occurrence of
以下本発明を竪形炉を例にとり、添付図面に基ついて説
明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings, taking a vertical furnace as an example.
ます、従来のステンレス鋼帯連続光輝焼鈍炉の設備及び
操業を第３図により説明する。First, the equipment and operation of a conventional stainless steel strip continuous bright annealing furnace will be explained with reference to FIG.
図中、１は炉導入部、２は加熱帯、３は冷却帯、４はト
ップロール、５は炉入口シール部、６は炉出口シール部
、７は光輝焼鈍されるステンレス鋼帯であり、８は加熱
帯人口部の雰囲気ガス流れ方向を示す矢印、９は焼鈍さ
れるステンレス鋼帯７の進行方向を示す矢印、ｖｌ、ｖ
２、■３は、各々炉導入部１、加熱帯２、冷却帯３への
雰囲気ガス供給量、ｖ５・ｖ６は各々炉入口シール部５
及び炉出口シール部６より炉外への雰囲気ガス放出量を
示す。In the figure, 1 is a furnace introduction part, 2 is a heating zone, 3 is a cooling zone, 4 is a top roll, 5 is a furnace entrance sealing part, 6 is a furnace exit sealing part, 7 is a bright annealed stainless steel strip, 8 is an arrow indicating the flow direction of atmospheric gas in the heating zone population, 9 is an arrow indicating the advancing direction of the stainless steel strip 7 to be annealed, vl, v
2 and 3 are the atmospheric gas supply amounts to the furnace introduction section 1, heating zone 2, and cooling zone 3, respectively, and v5 and v6 are the furnace inlet sealing section 5, respectively.
and the amount of atmospheric gas released from the furnace outlet seal portion 6 to the outside of the furnace.
このような設備により、ステンレス鋼帯７は炉入口シー
ル部５より炉内へ入り、炉導入部１内を上昇通過し、最
上部のトップロール４にて進行方向を下向きに転換して
加熱帯２に入る。加熱帯２内で、ステンレス鋼帯７は所
定の温度に加熱、均熱された後、冷却帯３内て常温近く
まて冷却されて炉出口シール部６を通って炉外へ出る。With this kind of equipment, the stainless steel strip 7 enters the furnace through the furnace inlet seal 5, ascends through the furnace introduction section 1, changes its direction of travel downward at the top roll 4, and closes the heating zone. Enter 2. The stainless steel strip 7 is heated and soaked to a predetermined temperature in the heating zone 2, then cooled to near room temperature in the cooling zone 3, and exits the furnace through the furnace outlet seal 6.
この場合、炉内への雰囲気ガスとして、炉導入部１へｖ
ｌ、加熱帯２へＶ２、冷却帯３へｖ３の量のアンモニア
分解ガス等の還元性ガスが供給され、炉入口シール部５
よりｖ５、炉出口シール部６より■６の量の雰囲気ガス
か炉外へ放出されている。In this case, v
1, a reducing gas such as ammonia decomposition gas is supplied to the heating zone 2 in an amount of V2, and to the cooling zone 3 in an amount of v3, and the furnace inlet seal part 5
Therefore, an amount of atmospheric gas of v5 is released from the furnace outlet seal portion 6 to the outside of the furnace.
従来、この雰囲気ガスの供給方法としては、雰囲気ガス
の還元力の有効利用上、焼鈍される銅帯表面の酸化反応
か最も発生しやすい加熱帯２の後半部及び冷却帯３にそ
の大半を供給する方法か採用されている。しかしこの場
合、炉入口シール部５及び炉出口シール部６よりの雰囲
気ガス放出量ｖ５、ｖ６かほぼ同一である為、加熱帯２
及び冷却帯３へ供給された雰囲気ガスｖ２＋■３の内、
炉出口シール部６よりの放出量シロに相当する量は、該
炉出ロジール部へ向って流れるか、残量（Ｖ２＋Ｖ３）
−ｖ６は、加熱帯２の人口部に鋼帯７の進行方向９と逆
方向の上昇雰囲気ガス流れ８を形成し、炉導入部１を経
由して炉入口シール部５へ向う。この為、加熱帯２内て
発生する白粉もこの上昇雰囲気ガス流れ８にのってＬ昇
し、炉導入部１方向へ運ばれる。このようなステンレス
鋼帯の光輝焼鈍において、本発明者は調査の結果、以下
の知見を得た。Conventionally, the method of supplying this atmospheric gas has been to supply most of it to the latter half of the heating zone 2 and the cooling zone 3, where oxidation reactions on the surface of the annealed copper strip are most likely to occur, in order to effectively utilize the reducing power of the atmospheric gas. What method is being adopted? However, in this case, since the amounts of atmospheric gas released from the furnace inlet seal part 5 and the furnace outlet seal part 6 are almost the same, v5 and v6, the heating zone 2
And of the atmospheric gas v2+■3 supplied to the cooling zone 3,
The amount equivalent to the amount released from the furnace outlet seal part 6 flows toward the furnace outlet seal part, or the remaining amount (V2 + V3)
-v6 forms an upward atmospheric gas flow 8 in the opposite direction to the traveling direction 9 of the steel strip 7 in the artificial part of the heating zone 2, and heads to the furnace inlet sealing part 5 via the furnace introduction part 1. For this reason, the white powder generated within the heating zone 2 also rises L along with the rising atmospheric gas flow 8 and is carried toward the furnace introduction section 1. Regarding bright annealing of such a stainless steel strip, the present inventor obtained the following knowledge as a result of investigation.
即ち、ステンレス鋼帯の光輝焼鈍炉に特有の白粉は、■
鋼帯７の温度か約３００℃程度以下の低温部でのみ鋼帯
７に付着する。Ｏ酸化物を含むという特性をもっている
。この為、炉導入部１方向に運ばれた白粉は、加熱帯２
０人口部及び炉導入部１て焼鈍前の低温の鋼帯７の表面
に付着する。そしてこの白粉の付着した鋼帯７が焼鈍さ
れる過程で高温になると、白粉中の酸化物と鋼帯７との
間て酸素の授与が行われ、鋼帯７の表面が局部的に酸化
されてテンパーカラーを生じ、斑点状汚れとなって、焼
鈍後の銅帯７表面に残るという知見を得た。In other words, the white powder peculiar to bright annealing furnaces for stainless steel strips is ■
It adheres to the steel strip 7 only in the low-temperature part, which is about 300° C. or lower than the temperature of the steel strip 7. It has the characteristic of containing O oxide. For this reason, the white powder transported in the direction of the furnace introduction section 1 is transferred to the heating zone 2.
It adheres to the surface of the low-temperature steel strip 7 before annealing at the zero population part and the furnace introduction part 1. When the steel strip 7 with this white powder attached becomes high temperature in the process of being annealed, oxygen is provided between the oxides in the white powder and the steel strip 7, and the surface of the steel strip 7 is locally oxidized. It has been found that temper color occurs and speckled stains remain on the surface of the copper strip 7 after annealing.
そこて以」二の知見に基づき本発明においては、この白
粉か炉導人部工方向へ運ばれて鋼帯７の表面■に付着し
斑点状汚れか発生することを低減する為、第１図に示す
ような設備によってステンレス鋼帯の連続光輝焼鈍を実
施するものである。図中の番号１〜９及び符号Ｖ、・ｖ
２・■３・■、・ｖ６は第３図と同様であるか、ＩＯは
雰囲気ガス昇圧装置、１１は雰囲気ガス中の白粉を除去
する装置、１２は雰囲気ガス冷却装置、■１は炉外雰囲
気ガス流れを形成している雰囲気ガス流量をそれぞわ示
している。即ち、本発明では、雰囲気ガス昇圧装置１０
を用いて、加熱帯２あるいは冷却帯３より一旦雰囲気ガ
スを炉外へ吸引した後炉導入部１へ再び供給することに
より、加熱帯２人口部の雰囲気ガス流れ方向８を焼鈍さ
れる鋼帯７の進行方向９と同一方向とする。この場合、
加熱帯２人口部の雰囲気ガス流れ方向８を焼鈍される鋼
帯７の進行方向９と同一方向とする為には、加熱帯２あ
るいは冷却帯３より炉導入部１へ向う炉外雰囲気ガス流
れを形成する雰囲気ガス流量ｖ１を、炉入口シール部５
よりの雰囲気ガス放出量ＶＳと炉導入部１への雰囲気ガ
ス供給夕Ｖ１との差ν５−ν１よｒ）も犬きくする必要
かある。コノ様ニＶｒ＞Ｖｓ−Ｖ＋、即チＶ、＋ ｖ、
＞ Ｖ。Therefore, based on the second knowledge, in the present invention, in order to reduce the possibility that this white powder is carried towards the furnace guide section and adheres to the surface (2) of the steel strip 7, causing spot-like stains, Continuous bright annealing of stainless steel strips is carried out using the equipment shown in the figure. Numbers 1 to 9 and symbols V, ・v in the figure
2・■3・■,・v6 are the same as in Fig. 3, IO is the atmosphere gas booster, 11 is the device for removing white powder in the atmosphere gas, 12 is the atmosphere gas cooling device, and ■1 is the outside of the furnace. The atmospheric gas flow rates forming the atmospheric gas flows are shown respectively. That is, in the present invention, the atmospheric gas pressurization device 10
The steel strip to be annealed is drawn in the atmospheric gas flow direction 8 of the heating zone 2 by first sucking the atmospheric gas out of the furnace from the heating zone 2 or the cooling zone 3 and then supplying it again to the furnace introduction section 1. The direction of movement is the same as the direction of movement 9 of 7. in this case,
In order to make the flow direction 8 of the atmospheric gas in the heating zone 2 in the same direction as the traveling direction 9 of the steel strip 7 to be annealed, the flow of the atmospheric gas outside the furnace from the heating zone 2 or the cooling zone 3 toward the furnace introduction section 1 is required. The atmospheric gas flow rate v1 that forms the furnace inlet seal part 5
It is also necessary to carefully consider the difference ν5-ν1 between the amount of atmospheric gas released VS and the amount V1 of atmospheric gas supplied to the furnace introduction section 1. Mr. Kono Vr>Vs-V+, so V, + v,
＞V.
とすることにより、炉導入部１へ供給された雰囲気ガス
の総量Ｖ、＋ Ｖ、の内、炉入口シール部５よりの雰囲
気ガス放出量Ｖ５に相当する量は炉人［）シール部５へ
向うか、残量Ｖ、＋ Ｖ、 −Ｖ５は加熱帯２に向フて
流れ、加熱帯２人口部に焼鈍されるｉＪ４帯７の進行方
向９と同一方向の雰囲気ガス流れ８が形成される。By doing so, out of the total amount of atmospheric gas V, + V, supplied to the furnace introduction section 1, the amount corresponding to the amount of atmospheric gas released from the furnace inlet sealing section 5, V5, is transferred to the furnace operator [) to the sealing section 5. The remaining amounts V, +V, -V5 flow toward the heating zone 2, and an atmospheric gas flow 8 is formed in the same direction as the traveling direction 9 of the iJ4 zone 7 to be annealed in the heating zone 2. .
［作用］
このように本発明の方法にてステンレス鋼帯の連続光輝
焼鈍を行うことにより、加熱帯２人「１部の雰囲気ガス
流れ方向８を焼鈍されるステンレス鋼帯７の進行方向９
と同一方向とすることがてきる。この為、加熱帯２にて
発生する白粉が炉導入部１方向へ直接運ばハて炉導入部
１て焼鈍市１の低温の鋼帯７の表面に付着することか防
止てきる。[Function] By performing continuous bright annealing of the stainless steel strip by the method of the present invention, as described above, two people in the heating zone "one part of the atmospheric gas flow direction 8 is moved in the advancing direction 9 of the stainless steel strip 7 to be annealed."
can be in the same direction as Therefore, the white powder generated in the heating zone 2 is directly transported toward the furnace introduction section 1 and is prevented from adhering to the surface of the low-temperature steel strip 7 in the annealing chamber 1 in the furnace introduction section 1.
又炉外の雰囲気ガス流れ経路を経て炉導入部１へ供給さ
れる雰囲気ガスｖｒ中に含まれる白粉についても、加熱
帯２あるいは冷却帯３より炉導入部１へ至る過程で低温
である冷却帯２の炉壁あるいは炉外雰囲気ガス流わ経路
の管壁へ付着し、その濃度か従来法において加熱帯２よ
り炉導入部１へ直接運ばれていた場合に比へて減じる為
、炉導入部１での鋼帯７への白粉付着量も従来法に比べ
て減じる。従って、銅帯７表面の斑点状汚れ発生か低減
できる。In addition, regarding the white powder contained in the atmospheric gas vr supplied to the furnace introduction section 1 via the atmospheric gas flow path outside the furnace, there is a cooling zone at a low temperature in the process from the heating zone 2 or the cooling zone 3 to the furnace introduction section 1. It adheres to the furnace wall of No. 2 or the pipe wall of the outside-furnace atmosphere gas flow path, and its concentration is reduced compared to when it is directly conveyed from the heating zone 2 to the furnace introduction section 1 in the conventional method. The amount of white powder adhering to the steel strip 7 in step 1 is also reduced compared to the conventional method. Therefore, the occurrence of speckled stains on the surface of the copper strip 7 can be reduced.
しかし、単に上記の様な炉外雰囲気ガス１ｆＬれを形成
し、冷却帯３の炉壁あるいは炉外雰囲気ガス流れ経路の
管壁への付着に頼るのみでは雰囲気ガスｖ１中の白粉の
減少が十分てはなく、従って銅帯７表面の斑点状汚れ発
生低減効果も十分とは言えない。However, simply forming 1 fL of outside-furnace atmospheric gas as described above and relying on its adhesion to the furnace wall of the cooling zone 3 or the pipe wall of the outside-furnace atmospheric gas flow path is insufficient to reduce the white powder in the atmospheric gas v1. Therefore, the effect of reducing the occurrence of speckled stains on the surface of the copper strip 7 cannot be said to be sufficient.
そこて、本発明の実施態様としては、炉外雰囲気ガス流
れ経路内に、白粉除去装置１１を設置する。この白粉除
去装置１１は、金属製あるいは布製のフィルターを用い
て雰囲気ガス中の白粉を捕集除去するものてあり、この
装置を設置して雰囲気ガス中の白粉を除去することによ
り炉導入部１へは白粉の非常に少ない雰囲気ガスがイノ
（給される為、斑灼状汚れ発生を一層低減することがて
きる。Therefore, in an embodiment of the present invention, a white powder removing device 11 is installed in the outside atmosphere gas flow path. This white powder removing device 11 uses a metal or cloth filter to collect and remove white powder in the atmospheric gas, and by installing this device and removing white powder in the atmospheric gas, the furnace introduction section Since an atmospheric gas with very little white powder is supplied to the surface, the occurrence of patchy stains can be further reduced.
また、この場合において加熱帯２あるいは冷却帯３より
炉外雰囲気ガス流れ経路を軒て、炉導入部１へ供給され
る雰囲気ガスしのガス温度が約３００℃程度以上の高温
である時には、炉外雰囲気ガス流れ経路内の白粉除去装
置１１と加熱帯２あるいは冷却帯３よりの雰囲気ガス吸
引口との間に雰囲気ガス冷却装置１２を設置することが
望ましい。In this case, when the gas temperature of the atmospheric gas supplied from the heating zone 2 or the cooling zone 3 to the furnace introduction section 1 through the outside atmosphere gas flow path is approximately 300°C or higher, the furnace It is desirable to install an atmospheric gas cooling device 12 between the white powder removing device 11 in the external atmospheric gas flow path and the atmospheric gas suction port from the heating zone 2 or the cooling zone 3.
この雰囲気ガス冷却装置１２を設置して白粉除去装置１
１通過時の雰囲気ガスのガス温度を約３４０”Ｃ以下の
低温にすることにより、白粉除去装置１１ての白粉の捕
集除去が促進される。この為、白粉除去装置１１を通過
後の炉外雰囲気ガス流れし中の白粉の量が一段と低減さ
れ、結果として、銅帯７表面の斑点状汚れ発生を尚−層
低バすることがてきる。なお、焼鈍されるステンレス鋼
帯が進行方向を転回するトップロール近傍の炉壁には加
熱帯側に什切り板Ｉ３を設けることによってステンレス
鋼帯の進行方向にガスを有効に流すことがてきる。By installing this atmospheric gas cooling device 12, the white powder removing device 1
By lowering the gas temperature of the atmospheric gas during the first passage to a low temperature of about 340"C or less, collection and removal of white powder in the white powder removing device 11 is promoted. For this reason, after passing through the white powder removing device 11, The amount of white powder in the flow of external atmospheric gas is further reduced, and as a result, the occurrence of speckled stains on the surface of the copper strip 7 can be further reduced.It should be noted that the stainless steel strip to be annealed is By providing a cutting plate I3 on the heating zone side on the furnace wall near the top roll that rotates, gas can be effectively flowed in the direction of movement of the stainless steel strip.
さらにこの場合、炉導入部１への雰囲気ガスの再供給方
法として第２図に示す方法を実施することか望ましい。Furthermore, in this case, it is preferable to implement the method shown in FIG. 2 as a method of resupplying atmospheric gas to the furnace introduction section 1.
図中の番号２．４．７〜１２及び符号Ｖ、は第１図と同
様であるか、１４は加熱帯２の直前に位置し鋼帯７の表
面に向い、鋼帯７の進行方向９と同方向に傾斜する方向
に開口し、これより雰囲気ガスを供給するノズルを示す
。即ち、このようなノズル１４を介して、炉導入部１へ
の雰囲気ガスの再供給を行うことにより、加熱帯２人口
部に形成される鋼帯７の進行方向９と同一方向の雰囲気
ガス流れ８か強められ、白粉の炉導入部１への侵入をよ
り効果的に防止し、結果として銅帯７表面の斑点状汚れ
発生低減効果か一層高まる。Numbers 2.4.7 to 12 and the symbol V in the figure are the same as those in FIG. This shows a nozzle that opens in a direction inclined in the same direction as the nozzle and from which atmospheric gas is supplied. That is, by resupplying the atmospheric gas to the furnace introduction section 1 through such a nozzle 14, the atmospheric gas flow in the same direction as the traveling direction 9 of the steel strip 7 formed in the heating zone 2 inlet section is achieved. 8 is strengthened, the intrusion of white powder into the furnace introduction part 1 is more effectively prevented, and as a result, the effect of reducing the occurrence of speckled stains on the surface of the copper strip 7 is further enhanced.
以上述へたような本発明の方法を実施した場合、白粉は
冷却帯３へ運ばれ、冷却帯３内のステンレス鋼帯７へ付
着するか、冷却帯３内の銅帯７はもはや表面酸化か発生
するような高温となることはなく、従って斑点状汚れ発
生には至らない。When the method of the present invention as described above is carried out, white powder is transported to the cooling zone 3 and adheres to the stainless steel strip 7 in the cooling zone 3, or the copper strip 7 in the cooling zone 3 is no longer surface oxidized. There is no high temperature that would cause staining, and therefore spotty stains do not occur.
［実施例］
第１図及び第２図に示した装置を用いて、ＳＵ′５４３
０ステンレス鋼帯（板厚］、Ｏｍｍ 、板幅１００１０
０Ｏを焼鈍温度８５０℃、露点−３２℃以下で光輝焼鈍
した場合の雰囲気ガスの供給、放出条件、加熱帯入口部
の雰囲気ガス流れ状況、炉外雰囲気ガス経路中の白粉除
去装置の有無、雰囲気ガス冷却装置の有無及び炉導入部
への雰囲気ガス再供給時のノズル使用の有無と、ステン
レス鋼帯表面の斑点状汚れ発生状況との関係を表１にま
とめて示す。[Example] Using the apparatus shown in FIGS. 1 and 2, SU'543
0 stainless steel strip (plate thickness), Omm, plate width 10010
Atmosphere gas supply and discharge conditions, atmosphere gas flow condition at the entrance of the heating zone, presence or absence of a white powder removal device in the outside furnace atmosphere gas path, and atmosphere when bright annealing 0O at an annealing temperature of 850°C and a dew point of -32°C or less Table 1 summarizes the relationship between the presence or absence of a gas cooling device and the use of a nozzle when resupplying atmospheric gas to the furnace inlet, and the occurrence of speckled stains on the surface of the stainless steel strip.
［発明の効果コ
本発明によればステンレス鋼帯の連続光輝焼鈍において
、加熱帯内て発生する白粉の炉導入部への侵入を防止す
ることができる。この為、該炉導入部でステンレス鋼帯
に付着した白粉中の酸化物によって加熱帯内て銅帯が局
部的に酸化して生しる斑点状汚れを低減することができ
る。また本発明の実施態様によって炉外雰囲気ガス流れ
経路に白粉除去装置を設置した場合は、炉導入部へ再供
給される雰囲気ガス中の白粉を除去することかできるの
て斑点状汚れの発生をより一層低減することかてきる。[Effects of the Invention] According to the present invention, white powder generated in the heating zone can be prevented from entering the furnace introduction section during continuous bright annealing of stainless steel strips. Therefore, spot stains caused by local oxidation of the copper strip within the heating zone due to oxides in the white powder adhering to the stainless steel strip at the furnace introduction section can be reduced. Furthermore, if a white powder removal device is installed in the outside-of-furnace atmospheric gas flow path according to the embodiment of the present invention, it is possible to remove white powder from the atmospheric gas that is re-supplied to the furnace introduction section, thereby preventing the occurrence of speckled dirt. It is possible to reduce this even further.
第１図、第２図は本発明を説明する図、第３図は従来法
を説明する図である。1 and 2 are diagrams for explaining the present invention, and FIG. 3 is a diagram for explaining the conventional method.
Claims (1)
るいは冷却帯より一旦炉外へ吸引した雰囲気ガスを炉導
入部へ再び供給する炉外雰囲気ガス流れ経路を設けるこ
とにより、加熱帯入口部の雰囲気ガスの流れ方向を焼鈍
されるステンレス鋼帯の進行方向と同一方向とすること
を特徴とするステンレス鋼帯の連続光輝焼鈍方法。 ２、炉外雰囲気ガス流れ経路に白粉除去装置を設置した
ことを特徴とする請求項１記載のステンレス鋼帯の連続
光輝焼鈍方法。[Claims] 1. In continuous bright annealing of stainless steel strips, by providing an outside-furnace atmospheric gas flow path for supplying the atmospheric gas once sucked out of the furnace from the heating zone or the cooling zone to the furnace introduction part, A continuous bright annealing method for a stainless steel strip, characterized in that the flow direction of atmospheric gas at the entrance of the heating zone is the same as the traveling direction of the stainless steel strip to be annealed. 2. The continuous bright annealing method for a stainless steel strip according to claim 1, wherein a white powder removing device is installed in the outside-furnace atmosphere gas flow path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2182573A JP2520507B2 (en) | 1990-07-12 | 1990-07-12 | Continuous bright annealing method for stainless steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2182573A JP2520507B2 (en) | 1990-07-12 | 1990-07-12 | Continuous bright annealing method for stainless steel strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0472021A true JPH0472021A (en) | 1992-03-06 |
| JP2520507B2 JP2520507B2 (en) | 1996-07-31 |
Family
ID=16120644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2182573A Expired - Lifetime JP2520507B2 (en) | 1990-07-12 | 1990-07-12 | Continuous bright annealing method for stainless steel strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2520507B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002003954A (en) * | 2000-05-25 | 2002-01-09 | Stein Heurtey | Method for safely operating heat treatment enclosure under controlled atmosphere, and plant used therefor |
| JP2011144433A (en) * | 2010-01-15 | 2011-07-28 | Nippon Metal Ind Co Ltd | Continuous annealing furnace |
| JP2011144402A (en) * | 2010-01-12 | 2011-07-28 | Daido Steel Co Ltd | Continuous bright-annealing method |
| JP2012233238A (en) * | 2011-05-02 | 2012-11-29 | Ihi Corp | Continuous heating furnace |
| EP2434026A4 (en) * | 2009-05-20 | 2016-09-07 | Chugai Ro Kogyo Kaisha Ltd | Continuous annealing furnace |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55176355U (en) * | 1979-06-07 | 1980-12-17 | ||
| JPS62177126A (en) * | 1986-01-31 | 1987-08-04 | Nisshin Steel Co Ltd | Method for continuously annealing strip |
-
1990
- 1990-07-12 JP JP2182573A patent/JP2520507B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55176355U (en) * | 1979-06-07 | 1980-12-17 | ||
| JPS62177126A (en) * | 1986-01-31 | 1987-08-04 | Nisshin Steel Co Ltd | Method for continuously annealing strip |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002003954A (en) * | 2000-05-25 | 2002-01-09 | Stein Heurtey | Method for safely operating heat treatment enclosure under controlled atmosphere, and plant used therefor |
| EP2434026A4 (en) * | 2009-05-20 | 2016-09-07 | Chugai Ro Kogyo Kaisha Ltd | Continuous annealing furnace |
| JP2011144402A (en) * | 2010-01-12 | 2011-07-28 | Daido Steel Co Ltd | Continuous bright-annealing method |
| JP2011144433A (en) * | 2010-01-15 | 2011-07-28 | Nippon Metal Ind Co Ltd | Continuous annealing furnace |
| JP2012233238A (en) * | 2011-05-02 | 2012-11-29 | Ihi Corp | Continuous heating furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2520507B2 (en) | 1996-07-31 |
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