JPH09268358A - Method for producing alloyed hot-dip galvanized steel strip - Google Patents
Method for producing alloyed hot-dip galvanized steel stripInfo
- Publication number
- JPH09268358A JPH09268358A JP8019596A JP8019596A JPH09268358A JP H09268358 A JPH09268358 A JP H09268358A JP 8019596 A JP8019596 A JP 8019596A JP 8019596 A JP8019596 A JP 8019596A JP H09268358 A JPH09268358 A JP H09268358A
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- steel strip
- dip galvanized
- galvanized steel
- hot
- temperature
- Prior art date
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Abstract
(57)【要約】
【課題】合金化溶融亜鉛めっき鋼帯の腰折れ状しわの発
生を防ぐ合金化溶融亜鉛めっき鋼帯の製造方法を提供す
る。
【解決手段】溶融亜鉛めっき後の溶融亜鉛めっき鋼帯に
加熱合金化処理を施し、次いで合金化溶融亜鉛めっき鋼
帯を２４０℃以下に冷却し、かつ鋼帯の幅方向に中央部
と両端部とで温度差ΔＴが下式（１）となるように冷却
することを特徴とする合金化溶融亜鉛めっき鋼帯の製造
方法。
ΔＴ＝Ｔcenter−Ｔedge＜１０×σ＋５…（１）
但し、Ｔcenterは板幅中央部の温度（℃）、Ｔedgeは板
両端部の温度（℃）、σは上記工程で鋼帯に作用するラ
イン張力（引張り応力：ｋｇｆ／ｍｍ2 ）を表わす。
(57) Abstract: [PROBLEMS] To provide a method for producing an alloyed hot dip galvanized steel strip, which prevents the occurrence of waist creases in the alloy hot dip galvanized steel strip. SOLUTION: The hot-dip galvanized steel strip after hot-dip galvanizing is subjected to a heat alloying treatment, then the alloyed hot-dip galvanized steel strip is cooled to 240 ° C or lower, and the central portion and both end portions in the width direction of the steel strip. A method for manufacturing an alloyed hot-dip galvanized steel strip, which comprises cooling so that the temperature difference ΔT is expressed by the following equation (1). ΔT = T center −T edge <10 × σ + 5 (1) where T center is the temperature (° C.) at the center of the plate width , T edge is the temperature (° C.) at both ends of the plate, and σ is the steel strip in the above process. Indicates the line tension (tensile stress: kgf / mm 2 ) that acts.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、台金化溶融亜鉛め
っき鋼帯の製造方法の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method for manufacturing a base metal hot-dip galvanized steel strip.
【０００２】[0002]
【従来の技術】溶融亜鉛めっき後の鋼帯を合金化炉に通
し、加熱合金化処理を施し、その後トップロール（デフ
レクターロール）を介して搬送するとき、溶融状態のめ
っき金属が部分的にトップロールに付着しやすい。これ
を防止するため、合金化炉とトップロールの間で鋼帯を
冷却することが一般に行われているが、その冷却方法が
不適切な場合、めっき鋼帯の板両端部に腰折れ状のしわ
が発生することが知られている。2. Description of the Related Art When a hot-dip galvanized steel strip is passed through an alloying furnace, heat-alloyed, and then conveyed through a top roll (deflector roll), the molten metal is partially topped. Easy to stick to the roll. In order to prevent this, it is common practice to cool the steel strip between the alloying furnace and the top roll, but if the cooling method is not appropriate, the strips of the plated steel strip should be bent at both ends. It is known to cause fire.
【０００３】このようなしわ発生を防止する従来技術と
して、たとえば特公平7-65153 号公報記載のものがあ
る。これは、溶融亜鉛めつき後の溶融亜鉛めっき鋼帯に
加熱合金化処理を施し、次いで合金化溶融亜鉛めっき鋼
帯を２５０〜４００℃に冷却する際に、該鋼帯の板幅方
向に中央部と両端部とで温度差を有し、その温度差の範
囲が−６０℃≦（中央部−両端部）≦＋３０℃になるよ
うに冷却して、しわの発生を防止しようとするものであ
る。As a conventional technique for preventing the occurrence of such wrinkles, there is, for example, one described in Japanese Patent Publication No. 7-65153. This is because when the hot-dip galvanized steel strip after hot dip galvanizing is subjected to a heat alloying treatment and then the alloyed hot-dip galvanized steel strip is cooled to 250 to 400 ° C., the steel strip is centered in the plate width direction. There is a temperature difference between the parts and both ends, and the temperature difference is cooled so that the range of the temperature difference is −60 ° C. ≦ (center part−both ends) ≦ + 30 ° C. to prevent the generation of wrinkles. is there.
【０００４】[0004]
【発明が解決しようとする課題】合金化溶融亜鉛めっき
鋼帯製造設備（ＣＧＬ）の溶融亜鉛ポットとトップロー
ルの間の鋼帯には、鋼帯を安定的に搬送するために、通
常、σ＝１〜５ｋｇｆ／ｍｍ2 のライン張力（引張り応
力）が作用している。しかしながら、鋼帯に中伸び等の
板形状乱れがあると、上記ライン張力は、板形状の乱れ
ていない板の局部に集中することになる。合金化溶融亜
鉛めっき鋼帯の腰折れ状しわは、この局部的に集中した
引張り応力が、材料の降伏応力を越えることによって発
生するものである。よって、腰折れ状しわの発生は、降
伏点伸びを有する材料で顕著であり、降伏点伸びの無い
材料では、しわの発生はない。The steel strip between the hot-dip zinc pot and the top roll of the galvannealed steel strip manufacturing facility (CGL) is usually σ in order to stably convey the steel strip. A line tension (tensile stress) of = 1 to 5 kgf / mm 2 is applied. However, if the steel strip has a plate shape disturbance such as medium elongation, the line tension is concentrated on a local portion of the plate where the plate shape is not disturbed. Waist creasing of the alloyed hot-dip galvanized steel strip is caused by the fact that the locally concentrated tensile stress exceeds the yield stress of the material. Therefore, the formation of waist-folded wrinkles is remarkable in the material having the yield point elongation, and the wrinkle does not occur in the material having no yield point elongation.
【０００５】ところで、材料の降伏応力の値は、同一材
料であっても温度によって変化し、鋼帯の温度が高くな
ると降伏応力は低下し、温度が低くなると降伏応力は大
きくなる。したがって、合金化溶融亜鉛めっき鋼帯の腰
折れ状しわの発生を防止するためには、まず、合金化炉
とトップロールの間での冷却を強化することによって、
鋼帯の温度を低下させ、降伏応力の値を高める必要があ
る。By the way, the value of the yield stress of a material changes depending on the temperature, even if the material is the same, the yield stress decreases as the temperature of the steel strip increases, and the yield stress increases as the temperature decreases. Therefore, in order to prevent the occurrence of crooked wrinkles in the alloyed hot-dip galvanized steel strip, first, by strengthening the cooling between the alloying furnace and the top roll,
It is necessary to lower the temperature of the steel strip and increase the yield stress value.
【０００６】次に、上記合金化炉とトップロールの間で
の冷却の際、板幅方向の冷却不均一、とりわけ板端部の
過冷却によって、通常、板幅中央部の温度が板両端部の
温度よりも高くなる。その結果、鋼帯に中伸びが発生
し、ライン張力（引張り応力）が板両端部に集中するこ
とにより、腰折れ状しわが発生する。したがって、合金
化溶融亜鉛めっき鋼帯の腰折れ状しわの発生を防止する
ためには、中伸びを発生させないこと、つまり、板幅方
向に温度分布がつかないように均一に冷却する必要があ
る。本発明は上記事情に鑑みてなされたもので、その目
的は合金化溶融亜鉛めっき鋼帯の腰折れ状しわの発生を
防止できる方法を提供する。Next, during cooling between the alloying furnace and the top roll, due to uneven cooling in the plate width direction, especially overcooling of the plate edges, the temperature at the center of the plate width is usually kept at both ends of the plate. Higher than the temperature of. As a result, middle stretch occurs in the steel strip, and line tension (tensile stress) concentrates at both ends of the plate, resulting in waist-folded wrinkles. Therefore, in order to prevent the occurrence of waist-wrinkled wrinkles in the alloyed hot-dip galvanized steel strip, it is necessary to prevent intermediate elongation, that is, to uniformly cool the strip so that there is no temperature distribution in the width direction. The present invention has been made in view of the above circumstances, and an object thereof is to provide a method capable of preventing the occurrence of waist creases in an alloyed hot-dip galvanized steel strip.
【０００７】[0007]
【課題を解決するための手段】すなわち本発明は、溶融
亜鉛めっき後の溶融亜鉛めっき鋼帯に加熱合金化処理を
施し、次いで得られた合金化溶融亜鉛めっき鋼帯を２４
０℃以下かつ鋼帯の幅方向に中央部と両端部との温度差
ΔＴが下式（１）となるように冷却することを特徴とす
る合金化溶融亜鉛めっき鋼帯の製造方法である。[Means for Solving the Problems] That is, according to the present invention, a hot-dip galvanized steel strip after hot dip galvanizing is subjected to a heat-alloying treatment, and then the obtained hot-dip galvanized steel strip is formed into 24 pieces.
A method for producing an alloyed hot-dip galvanized steel strip, which is characterized in that cooling is performed so that a temperature difference ΔT between a central portion and both end portions in the width direction of the steel strip is 0 ° C. or less and the following equation (1) is obtained.
【０００８】 ΔＴ＝Ｔcenter−Ｔedge＜１０×σ＋５…（１） 但し、Ｔcenterは板幅中央部の温度（℃）、Ｔedgeは板
両端部の温度（℃）、σは上記工程で鋼帯に作用するラ
イン張力（引張り応力：ｋｇｆ／ｍｍ2 ）を表わす。ΔT = T center −T edge <10 × σ + 5 (1) where T center is the temperature (° C.) at the center of the plate width , T edge is the temperature at both ends of the plate (° C.), and σ is the above process. The line tension (tensile stress: kgf / mm 2 ) acting on the steel strip is shown.
【０００９】[0009]
【発明の実施の形態】本発明では、まず、合金化炉とト
ップロールの間で、合金化溶融亜鉛めっき鋼帯を２４０
℃以下になるように冷却する。これにより、鋼帯の降伏
応力の値が高くなり、ライン張力（引張り応力）が局部
的に集中しても、腰折れ状しわが発生しにくくなる。さ
らに、上記冷却は、めっき金属のトップロール付着防止
にも効果的である。なお、２４０℃を越えると、鋼帯の
降伏応力の値が低く、腰折れ状しわが発生しやすくな
り、しかもめっき金属がトップロールに付着しやすくな
り、不適切である。BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, first, a galvannealed steel strip having a thickness of 240 mm is formed between an alloying furnace and a top roll.
Cool to below ℃. As a result, the value of the yield stress of the steel strip is increased, and even if the line tension (tensile stress) is locally concentrated, the waist creases are less likely to occur. Further, the above cooling is also effective in preventing the top roll adhesion of the plated metal. If the temperature exceeds 240 ° C., the yield stress of the steel strip is low, waist creases are likely to occur, and the plated metal tends to adhere to the top roll, which is unsuitable.
【００１０】次に、鋼帯の幅方向に中央部と両端部との
温度差ΔＴが式（１）となるように冷却する。この式
（１）は、本発明者らが新たに見出だした知見である。
すなわち、本発明者らは、ライン張力（引張り応力）が
鋼帯の局部に集中する／しない条件、つまり、鋼帯に中
伸びが発生する／しない条件を明確にするために、板幅
方向に温度分布を有する板の変形解析を行った。その結
果、 １）中伸びは、板幅中央部の温度が板両端部の温度より
高いときのみに発生すること、 ２）板幅中央部と板両端部の温度差をΔＴとするとき、
中伸びは、ΔＴがある値以上の温度差で発生し、その値
以下の温度差ΔＴでは発生しないこと、つまり、中伸び
が発生する限界の温度差ΔＴが存在すること、 ３）ΔＴの値は、ライン張力（引張り応力）の大小によ
って異なること、を新たに見いだした。具体的に示す
と、ライン張力（引張り応力）σが、σ＝１、２、３、
４、５ｋｇｆ／ｍｍ2 の各ケースに対して、中伸びが発
生する限界の温度差ΔＴは、それぞれΔＴ＝１５、２
５、３５、４５、５５℃である。したがって、各ライン
張力σ（ｋｇｆ／ｍｍ2 ）に対して、板幅中央部と板両
端部の温度差ΔＴ（℃）が、ΔＴ＜１０×σ＋５となる
ようにすれば、中伸びの発生を防止でき、腰折れ状しわ
が発生しなくなる。Next, the steel strip is cooled in the width direction so that the temperature difference ΔT between the central portion and the both end portions becomes the equation (1). The formula (1) is a finding newly found by the present inventors.
That is, in order to clarify the condition that the line tension (tensile stress) concentrates / does not concentrate on a local portion of the steel strip, that is, the condition that medium elongation occurs / does not occur in the steel strip in the strip width direction. The deformation analysis of the plate with temperature distribution was performed. As a result, 1) medium elongation occurs only when the temperature at the center of the plate width is higher than the temperature at both ends of the plate, and 2) when the temperature difference between the center of the plate width and both ends of the plate is ΔT,
Medium elongation occurs at a temperature difference of a certain value ΔT or more, and does not occur at a temperature difference ΔT less than that value, that is, there is a limit temperature difference ΔT at which the medium elongation occurs, 3) The value of ΔT Newly found that the line tension (tensile stress) depends on the magnitude of the line tension. Specifically, the line tension (tensile stress) σ is σ = 1, 2, 3,
For each of the cases of 4 and 5 kgf / mm 2 , the temperature difference ΔT at which the intermediate elongation occurs is ΔT = 15 and 2 respectively.
5, 35, 45 and 55 ° C. Therefore, for each line tension σ (kgf / mm 2 ), if the temperature difference ΔT (° C.) between the center of the plate width and both ends of the plate is ΔT <10 × σ + 5, the occurrence of medium elongation will occur. It can be prevented and waist creases will not occur.
【００１１】つまり、本発明においては、溶融亜鉛めっ
き後の溶融亜鉛めっき鋼帯に加熱合金化処理を施し、次
いで合金化溶融亜鉛めっき鋼帯を２４０℃以下に冷却す
る際に、該鋼帯の板幅方向に中央部と両端部との温度差
ΔＴが式（１）となるように冷却し、次いでトップロー
ル（デフレクターロール）を介して搬送することで、合
金化溶融亜鉛めっき鋼帯の腰折れ状しわを防止する。That is, in the present invention, when the hot-dip galvanized steel strip after hot dip galvanizing is subjected to a heat alloying treatment and then the alloyed hot-dip galvanized steel strip is cooled to 240 ° C. or lower, Cooling is performed so that the temperature difference ΔT between the center and both ends in the plate width direction becomes the formula (1), and then it is conveyed through a top roll (deflector roll), so that the alloyed hot-dip galvanized steel strip is bent. Prevent wrinkles.
【００１２】 ΔＴ＝Ｔcenter−Ｔedge＜１０×σ＋５…（１） 但し、Ｔcenterは板幅中央部の温度（℃）、Ｔedgeは板
両端部の温度（℃）、σは上記工程（溶解亜鉛ポットと
トップロールの間）の鋼帯に作用するライン張力（引張
り応力、ｋｇｆ／ｍｍ2 ）を表わす。ΔT = T center −T edge <10 × σ + 5 (1) where T center is the temperature (° C.) at the center of the plate width , T edge is the temperature at both ends of the plate (° C.), and σ is the above step ( It represents the line tension (tensile stress, kgf / mm 2 ) acting on the steel strip between the molten zinc pot and the top roll.
【００１３】なお、本発明では、中央部と両端部との温
度差ΔＴが下式（１）となるように冷却するが、必ずし
も中央部と両端部との温度を測定することに限定されな
い。中央部と両端部との温度差ΔＴを算出できれば、他
の箇所を測定することも可能である。In the present invention, cooling is performed so that the temperature difference ΔT between the central portion and both end portions is expressed by the following equation (1), but it is not necessarily limited to measuring the temperature between the central portion and both end portions. If the temperature difference ΔT between the central portion and both end portions can be calculated, it is possible to measure other points.
【００１４】また、鋼帯の板幅方向の温度調節は、たと
えば、鋼帯の板幅方向にガス冷却用のノズルを複数個配
置し、各ノズルの流量を調整することによってなされ
る。以上説明したように、鋼帯を合金化炉とトップロー
ルの間で２４０℃以下になるように冷却することで、鋼
帯の降伏応力を高める。次に、板幅中央部と板端部の温
度差ΔＴを式（１）を満足するように冷却することで、
中伸びの発生を防止し、ライン張力の板端部への局部集
中を回避する。このように本発明では、降伏応力を高く
して、かつライン張力が局部に集中しないようにしたの
で、鋼帯に働く引張り応力が降伏応力を越えなくなり、
降伏点伸びを有する材料であっても、腰折れ状しわは発
生しない。The temperature control of the steel strip in the plate width direction is performed, for example, by disposing a plurality of gas cooling nozzles in the steel strip plate width direction and adjusting the flow rate of each nozzle. As described above, the yield stress of the steel strip is increased by cooling the steel strip between the alloying furnace and the top roll to 240 ° C. or lower. Next, by cooling the temperature difference ΔT between the plate width center part and the plate edge part so as to satisfy the equation (1),
Prevents the occurrence of medium elongation and avoids local concentration of line tension at the plate edge. As described above, in the present invention, since the yield stress is increased and the line tension is not concentrated locally, the tensile stress acting on the steel strip does not exceed the yield stress,
Even if the material has a yield point elongation, waist-folding wrinkles do not occur.
【００１５】さらに、本発明では、中伸びの発生する板
幅中央部と板端部の温度差ΔＴがライン張力によって異
なることから、従来技術のように、中伸び発生を防止す
るための温度管理をΔＴ＝一定値とするのではなく、ラ
イン張力に応じてΔＴの管理をするようにしたので、腰
折れ状しわの発生を完全に防止することができる。ま
た、合金化炉とトップロールの間で、鋼帯を２４０℃以
下になるように冷却することで、めっき金属のトップロ
ール付着の問題が完全に防止できる。Further, according to the present invention, since the temperature difference ΔT between the central portion of the plate width and the end portion of the plate where the intermediate elongation occurs is different depending on the line tension, the temperature control for preventing the occurrence of the intermediate elongation as in the prior art. Since ΔT is not set to be a constant value, but ΔT is managed according to the line tension, it is possible to completely prevent the occurrence of waist-folded wrinkles. Further, by cooling the steel strip between the alloying furnace and the top roll so as to be 240 ° C. or lower, the problem of adhesion of the plated metal to the top roll can be completely prevented.
【００１６】[0016]
【実施例】図１は、本発明を合金化溶融亜鉛めっき鋼帯
製造設備（ＣＧＬ）の合金化炉とトップロールの間の冷
却帯に適用したときの結果を示したものである。実施例
においては、鋼帯の板幅方向にガス冷却用のノズルを複
数個配置し、各ノズルの流量を調整することによって、
板幅方向の温度分布を変化させ、かつ板幅内の最高温度
が２４０℃以下になるようにした。図の横座標はライン
張力σ（ｋｇｆ／ｍｍ2 ）、縦座標は板幅中央部と板両
端部の温度差ΔＴ（℃）であり、図中の（○）は腰折れ
状しわが発生しなかったデータ、（Δ）および（×）は
腰折れ状しわが発生したデータで、（Δ）は軽度のも
の、（×）は重度なものを示す。また、図中の直線は、
ΔＴ＝１０×σ＋５なる関係を表しており、この直線よ
り上の領域は、ΔＴ＞１０×σ＋５となり中伸びが発生
すると予想される領域、直線より下の領域は、ΔＴ＜１
０×σ＋５であり中伸びが発生しないと予想される領域
である。EXAMPLE FIG. 1 shows the results of applying the present invention to a cooling zone between an alloying furnace and a top roll of a galvannealed steel strip manufacturing facility (CGL). In the example, a plurality of gas cooling nozzles are arranged in the width direction of the steel strip, and by adjusting the flow rate of each nozzle,
The temperature distribution in the plate width direction was changed, and the maximum temperature within the plate width was set to 240 ° C or less. The abscissa of the figure is the line tension σ (kgf / mm 2 ), the ordinate is the temperature difference ΔT (° C) between the center of the plate width and both ends of the plate, and (○) in the figure shows no waist creases. The data (Δ) and (×) are the data on which the waist-folded wrinkles are generated, (Δ) shows a mild one, and (×) shows a severe one. The straight line in the figure is
The relationship above ΔT = 10 × σ + 5 is expressed. The area above this straight line is ΔT> 10 × σ + 5 and the area where medium elongation is expected to occur, and the area below the straight line is ΔT <1.
It is 0 × σ + 5, which is a region in which it is expected that medium elongation will not occur.
【００１７】図１の特性から明らかなように、腰折れ状
しわが発生したデータはこの直線より上の領域に、腰折
れ状しわが発生しなかったデータはこの直線より下の領
域に位置しており、前記式（１）によって中伸びの発生
を抑制することにより、腰折れ状しわが防止できること
が確認された。As is clear from the characteristics shown in FIG. 1, the data in which the waist creases are generated is located in the area above this line, and the data in which the waist creases are not generated are located in the area below this line. It was confirmed that the waist creases can be prevented by suppressing the occurrence of intermediate elongation by the formula (1).
【００１８】[0018]
【発明の効果】以上のように、本発明によれば、合金化
炉とトップロールの間で、鋼帯の降伏応力を高めるため
に、鋼帯を２４０℃以下に冷却し、さらに、中伸びによ
るライン張力の局部集中を防止するために、板幅中央部
と板端部の温度差ΔＴを調整するようにしたので、合金
化溶融亜鉛めっき鋼帯の腰折れ状しわの発生を防ぐこと
ができる。As described above, according to the present invention, in order to increase the yield stress of the steel strip between the alloying furnace and the top roll, the steel strip is cooled to 240 ° C. or lower and further subjected to medium elongation. In order to prevent the local concentration of the line tension due to the above, the temperature difference ΔT between the plate width center part and the plate end part is adjusted, so that it is possible to prevent the occurrence of waist creasing wrinkles in the alloyed hot dip galvanized steel strip. .
【図１】本発明を合金化溶融亜鉛めっき鋼帯製造設備
（ＣＧＬ）の合金化炉とトップロールの間の冷却帯に適
用したときの腰折れ状しわの発生状況を示した図。FIG. 1 is a diagram showing the occurrence of waist creases when the present invention is applied to a cooling zone between an alloying furnace and a top roll of a galvannealed steel strip manufacturing facility (CGL).
───────────────────────────────────────────────────── フロントページの続き (72)発明者 木戸 章雅 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 野出 俊策 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 中村 清治 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shomasa Kido 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd. No. Nihon Steel Tube Co., Ltd. (72) Inventor Seiji Nakamura 1-2 1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Tube Co., Ltd.
Claims (1)
に加熱合金化処理を施し、次いで得られた合金化溶融亜
鉛めっき鋼帯を２４０℃以下かつ鋼帯の幅方向に中央部
と両端部との温度差ΔＴが下式（１）となるように冷却
することを特徴とする合金化溶融亜鉛めっき鋼帯の製造
方法。 ΔＴ＝Ｔcenter−Ｔedge＜１０×σ＋５…（１） 但し、Ｔcenterは板幅中央部の温度（℃）、Ｔedgeは板
両端部の温度（℃）、σは上記工程で鋼帯に作用するラ
イン張力（引張り応力：ｋｇｆ／ｍｍ2 ）を表わす。1. A hot-dip galvanized steel strip after hot-dip galvanizing is subjected to a heat-alloying treatment, and then the obtained galvannealed steel strip is cut at a temperature of 240 ° C. or less and in the width direction of the steel strip at the center and both ends. And a method for producing an alloyed hot-dip galvanized steel strip, characterized in that cooling is performed so that a temperature difference ΔT between and is expressed by the following formula (1). ΔT = T center −T edge <10 × σ + 5 (1) where T center is the temperature (° C.) at the center of the plate width , T edge is the temperature (° C.) at both ends of the plate, and σ is the steel strip in the above process. Indicates the line tension (tensile stress: kgf / mm 2 ) that acts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08019596A JP3221315B2 (en) | 1996-04-02 | 1996-04-02 | Manufacturing method of galvannealed steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08019596A JP3221315B2 (en) | 1996-04-02 | 1996-04-02 | Manufacturing method of galvannealed steel strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09268358A true JPH09268358A (en) | 1997-10-14 |
| JP3221315B2 JP3221315B2 (en) | 2001-10-22 |
Family
ID=13711610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08019596A Expired - Fee Related JP3221315B2 (en) | 1996-04-02 | 1996-04-02 | Manufacturing method of galvannealed steel strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3221315B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002256408A (en) * | 2001-02-28 | 2002-09-11 | Nisshin Steel Co Ltd | Method for manufacturing continuously hot-dipped steel sheet free from creases |
| JP2006274421A (en) * | 2005-03-30 | 2006-10-12 | Jfe Steel Kk | Combustion control method for continuous heating furnace |
| JP2013245376A (en) * | 2012-05-25 | 2013-12-09 | Jfe Steel Corp | Method for producing hot-dip galvanized steel plate |
| KR20170021310A (en) | 2014-07-24 | 2017-02-27 | 신닛테츠스미킨 카부시키카이샤 | Cooling method and cooling device for strip steel |
| JP7722618B1 (en) * | 2024-03-27 | 2025-08-13 | Ｊｆｅスチール株式会社 | High-strength hot-dip galvanized steel sheet and method for manufacturing the same |
| JP7722617B1 (en) * | 2024-03-27 | 2025-08-13 | Ｊｆｅスチール株式会社 | High-strength hot-dip galvanized steel sheet and method for manufacturing the same |
-
1996
- 1996-04-02 JP JP08019596A patent/JP3221315B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002256408A (en) * | 2001-02-28 | 2002-09-11 | Nisshin Steel Co Ltd | Method for manufacturing continuously hot-dipped steel sheet free from creases |
| JP2006274421A (en) * | 2005-03-30 | 2006-10-12 | Jfe Steel Kk | Combustion control method for continuous heating furnace |
| JP2013245376A (en) * | 2012-05-25 | 2013-12-09 | Jfe Steel Corp | Method for producing hot-dip galvanized steel plate |
| KR20170021310A (en) | 2014-07-24 | 2017-02-27 | 신닛테츠스미킨 카부시키카이샤 | Cooling method and cooling device for strip steel |
| US10465262B2 (en) | 2014-07-24 | 2019-11-05 | Nippon Steel Corporation | Method for cooling steel strip and cooling apparatus |
| JP7722618B1 (en) * | 2024-03-27 | 2025-08-13 | Ｊｆｅスチール株式会社 | High-strength hot-dip galvanized steel sheet and method for manufacturing the same |
| JP7722617B1 (en) * | 2024-03-27 | 2025-08-13 | Ｊｆｅスチール株式会社 | High-strength hot-dip galvanized steel sheet and method for manufacturing the same |
| WO2025203937A1 (en) * | 2024-03-27 | 2025-10-02 | Ｊｆｅスチール株式会社 | High-strength hot-dip galvanized steel sheet and method for producing same |
| WO2025203938A1 (en) * | 2024-03-27 | 2025-10-02 | Ｊｆｅスチール株式会社 | High-strength hot-dip galvanized steel sheet and method for producing same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3221315B2 (en) | 2001-10-22 |
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