JPH10298730A - Black spot flaw prevention device for hot-dip galvanized steel sheet - Google Patents
Black spot flaw prevention device for hot-dip galvanized steel sheetInfo
- Publication number
- JPH10298730A JPH10298730A JP10892197A JP10892197A JPH10298730A JP H10298730 A JPH10298730 A JP H10298730A JP 10892197 A JP10892197 A JP 10892197A JP 10892197 A JP10892197 A JP 10892197A JP H10298730 A JPH10298730 A JP H10298730A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- cooling
- hot
- gas
- dust
- 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
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims description 26
- 239000008397 galvanized steel Substances 0.000 title claims description 26
- 206010027146 Melanoderma Diseases 0.000 title description 3
- 230000002265 prevention Effects 0.000 title 1
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 68
- 239000010959 steel Substances 0.000 claims abstract description 68
- 238000001816 cooling Methods 0.000 claims abstract description 63
- 239000000428 dust Substances 0.000 claims abstract description 40
- 239000007789 gas Substances 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000005275 alloying Methods 0.000 claims abstract description 14
- 239000000112 cooling gas Substances 0.000 claims abstract description 12
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000011248 coating agent Substances 0.000 claims abstract description 11
- 238000000576 coating method Methods 0.000 claims abstract description 11
- 239000010935 stainless steel Substances 0.000 claims abstract description 11
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 11
- 239000011701 zinc Substances 0.000 claims abstract description 11
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 11
- 238000005246 galvanizing Methods 0.000 claims abstract description 9
- 239000007921 spray Substances 0.000 claims abstract description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract description 38
- 239000002245 particle Substances 0.000 abstract description 22
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 abstract description 19
- 235000002639 sodium chloride Nutrition 0.000 abstract description 19
- 239000011780 sodium chloride Substances 0.000 abstract description 19
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000003584 silencer Effects 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003595 mist Substances 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 230000003449 preventive effect Effects 0.000 description 3
- 241001163841 Albugo ipomoeae-panduratae Species 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 241000221535 Pucciniales Species 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000006061 abrasive grain Substances 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000030279 gene silencing Effects 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Coating With Molten Metal (AREA)
Abstract
(57)【要約】
【課題】 鋼板表面に微細な塵・埃・酸化鉄・海塩粒子
等を直接吹き付けることがなく、その結果、製造された
合金化溶融亜鉛めっき鋼板に黒点疵を発生させることの
ない装置を提供する。
【解決手段】 鋼板１に溶融亜鉛めっきを施した後、付
着量制御装置で亜鉛付着量を調整し、合金化炉で加熱・
保持・冷却、あるいは、加熱・冷却して製造する合金化
溶融亜鉛めっき鋼板の表面に発生する黒点疵を防止する
装置である。鋼板１を冷却する保持帯兼用冷却帯７、Ｎ
ｏ１，２空冷帯８，９のガス吸引部から鋼板１への吹付
けノズルに至る接ガス部分をステンレス鋼板で製作す
る。ブロワー７ｃ，８ｂ，９ｂの入り側における冷却ガ
スの流速を１．０〜３．０ｍ／ｓとなすべく、フィルタ
ーボックス７ｆ，８ｅ，９ｅの入り側部分のダクト径を
大きくし、かつ、この大きくしたダクト部分に１５μｍ
以上の粉塵を除去するフィルター７ｈ，８ｇ，９ｇを配
置する。
(57) [Summary] [PROBLEMS] To prevent fine dust, dust, iron oxide, sea salt particles, etc. from being directly sprayed on the surface of a steel sheet, and as a result, to produce black spots on the manufactured galvannealed steel sheet. Equipment that does not SOLUTION: After subjecting a steel sheet 1 to hot-dip galvanizing, the amount of zinc coating is adjusted by a coating amount control device, and heating and heating is performed in an alloying furnace.
This device prevents black spots from being generated on the surface of a galvannealed steel sheet manufactured by holding and cooling or heating and cooling. Holding band / cooling band 7, which cools the steel sheet 1, N
o1, The gas contact part from the gas suction part of the air cooling zones 8 and 9 to the spray nozzle to the steel plate 1 is made of stainless steel plate. In order to make the flow velocity of the cooling gas at the entrance side of the blowers 7c, 8b, 9b to be 1.0 to 3.0 m / s, the duct diameter at the entrance side of the filter boxes 7f, 8e, 9e is increased, and 15μm on the duct part
Filters 7h, 8g and 9g for removing the above dust are arranged.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、溶融亜鉛めっき鋼
板の製造時、溶融亜鉛めっき鋼板の表面に発生する黒点
疵を防止する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 an apparatus for preventing black spots generated on the surface of a hot-dip galvanized steel sheet during the production of the hot-dip galvanized steel sheet.
【０００２】[0002]
【従来の技術】連続溶融亜鉛めっきラインにおいては、
溶融亜鉛めっき浴中でめっきされた鋼板は、付着量制
御装置で亜鉛付着量を調整された後、加熱帯，保持帯，
冷却帯で構成される合金化処理炉でのガルバニール処理
により、鋼素地と亜鉛層との間に相互拡散させた合金化
溶融亜鉛めっき（ＧＡ）鋼板となしたり、付着量制御
装置で亜鉛付着量を調整された後、鋼板をそのままの状
態で冷却し、美麗な華模様を生じるレギュラー（ノーマ
ル）スパングル鋼板（ＧＩ鋼板）となしたり、めっき
後の鋼板を、亜鉛結晶の成長速度より速い速度で多数の
核を生成させ、肉眼では判別できない微細な華模様を生
じさせるミニマイズド（ゼロ）スパングル鋼板となした
りしている。2. Description of the Related Art In a continuous hot-dip galvanizing line,
For the steel sheet plated in the hot-dip galvanizing bath, the zinc coating amount is adjusted by the coating amount control device, and then the heating zone, the holding zone,
By galvanizing treatment in an alloying treatment furnace consisting of a cooling zone, an alloyed hot-dip galvanized (GA) steel sheet is diffused between the steel base and the zinc layer. After the steel sheet is adjusted, the steel sheet is cooled as it is to make a regular (normal) spangle steel sheet (GI steel sheet) that produces a beautiful flower pattern, or the steel sheet after plating is formed at a speed higher than the growth rate of zinc crystals. For example, it is a minimized (zero) spangle steel sheet that generates a large number of nuclei and produces fine flower patterns that cannot be discerned by the naked eye.
【０００３】なかでも、ＧＡ鋼板は、塗膜の密着性、塗
装後の耐食性及びスポット溶接性等の特性を有するた
め、自動車用材料や家電製品に多く用いられている。こ
のＧＡ鋼板は、めっきの付着量を調整された後、加熱帯
において５００〜６００℃程度まで加熱され、その後、
保持帯で、ある一定温度に保持された後、保持帯の下流
側に設けられた冷却帯でガスジェット冷却やミスト冷却
され、ＧＡ鋼板となされた後、冷却帯の下流側に配置し
たトップロールにより進行方向を垂直方向から水平方向
に変更されて次工程に送られ、製品となされる。[0003] Among them, GA steel sheets are widely used for automotive materials and home electric appliances because they have properties such as adhesion of coating films, corrosion resistance after coating, and spot weldability. This GA steel sheet is heated to about 500 to 600 ° C. in a heating zone after the amount of plating is adjusted,
After being held at a certain temperature in the holding zone, gas jet cooling or mist cooling is performed in a cooling zone provided on the downstream side of the holding zone. As a result, the traveling direction is changed from the vertical direction to the horizontal direction, and the product is sent to the next process to be completed.
【０００４】この一連の工程において問題となるのが、
鋼板を冷却する際に吹き付けるガスやミストに含まれる
微細な塵・埃・酸化鉄・海塩粒子等である。すなわち、
鋼板を冷却するために、ブロワーでガスを吸引し、吹き
付ける場合、これらの微細な塵・埃・酸化鉄・海塩粒子
等も同時に吸引され、鋼板に吹き付けられる。その結
果、鋼板表面に付着した微細な塵・埃・酸化鉄・海塩粒
子等は、トップロール等で鋼板の表面に押し込まれ、製
品疵（以下、これを「黒点疵」という）となる。A problem in this series of steps is that
Fine dust, dust, iron oxide, sea salt particles, etc. contained in the gas and mist sprayed when cooling the steel sheet. That is,
When a gas is sucked and blown with a blower to cool the steel sheet, these fine dust, dust, iron oxide, sea salt particles, and the like are also sucked at the same time and sprayed on the steel sheet. As a result, fine dust, dust, iron oxide, sea salt particles and the like adhering to the surface of the steel sheet are pushed into the surface of the steel sheet by a top roll or the like, resulting in product flaws (hereinafter referred to as “black spot flaws”).
【０００５】また、反対に鋼板に吹き付けられた微細な
塵・埃・酸化鉄・海塩粒子等がロール側に押し込められ
た場合、ロール自体に疵が付くことによって、鋼板自体
に付着物がなくても、以後、ロールの回転周期毎に鋼板
の表面に疵が発生することになる。このようにしてでき
た黒点疵は、鋼板をプレスする際、プレスブツ発生の要
因となってしまう。その結果、需要家の品質上の要求を
満足できないことになる。On the other hand, when fine dust, dust, iron oxide, sea salt particles and the like sprayed on the steel sheet are pushed into the roll side, the roll itself is scratched, and there is no deposit on the steel sheet itself. However, thereafter, flaws are generated on the surface of the steel sheet every rotation cycle of the roll. The black spot flaws thus formed may cause press spots when pressing a steel sheet. As a result, the quality requirements of the consumer cannot be satisfied.
【０００６】ところで、従来の合金化処理装置におい
て、例えば特開昭６４−２８３５３号公報では、合金化
処理装置の保持帯と冷却帯の間に保熱箱及び冷却箱を交
換使用可能に配置し、保持帯と保熱箱、保熱箱と冷却
箱、または冷却箱と冷却帯の結合を、上下に伸縮できる
蛇腹等を用いて外気の侵入を防止するものが提案されて
いる。Meanwhile, in a conventional alloying apparatus, for example, in Japanese Patent Laid-Open No. 28353/1988, a heat retaining box and a cooling box are exchangeably disposed between a holding zone and a cooling zone of the alloying apparatus. In order to prevent external air from invading by using a bellows which can expand and contract up and down, it has been proposed to connect a holding band and a heat insulation box, a heat insulation box and a cooling box, or a cooling box and a cooling band.
【０００７】また、特開平５−１７９４１５号公報で
は、合金化処理装置を構成する加熱帯の下流側に冷却帯
と保持帯を並列に設け、加熱帯で加熱された溶融亜鉛め
っき鋼板を直ちに冷却するか、一定時間保熱してから冷
却するかの選択を可能にした合金化処理装置が提案さ
れ、加熱炉をガス加熱方式とした場合、発生した高温ガ
スにより後続の冷却帯や保熱帯が熱影響を受けないよう
に炉をシール構造とし、発生した高温ガスはダクトを介
して排出するものが開示されている。In Japanese Patent Application Laid-Open No. 5-179415, a cooling zone and a holding zone are provided in parallel on the downstream side of a heating zone constituting an alloying apparatus, and a hot-dip galvanized steel sheet heated in the heating zone is immediately cooled. Or an alloying treatment system that allows the user to choose between keeping the heat for a certain period of time and then cooling it.If the heating furnace is of a gas heating type, the subsequent cooling zone and the tropical heat are heated by the generated high-temperature gas. It discloses that the furnace has a sealed structure so as not to be affected, and generated hot gas is discharged through a duct.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、上記し
た発明は、いずれも良好なＧＡ鋼板の製造が可能な装置
を提供することを目的としており、合金化処理時、鋼板
を冷却するガスやミスト内に含まれる微細な塵・埃・酸
化鉄・海塩粒子等に起因する黒点疵を防止することにつ
いては何らの対策をも講じていない。However, it is an object of the above-mentioned inventions to provide an apparatus capable of producing a good GA steel sheet, and to provide a gas or mist for cooling the steel sheet during alloying treatment. No measures have been taken to prevent black spots caused by fine dust, dust, iron oxide, sea salt particles and the like contained in the water.
【０００９】すなわち、特開昭６４−２８３５３号公報
では、保持帯，保熱箱，冷却箱，冷却帯については蛇腹
を用いて外気の侵入を防ぐ構造となっているが、逆にガ
スやミストを吹き付ける冷却帯側にはいかなる対策をも
講じていない。従って、微細な塵・埃・酸化鉄・海塩粒
子等が直接鋼板に吹き付けられてしまうことになる。こ
のことは、特開平５−１７９４１５号公報についても、
同様である。That is, in Japanese Patent Application Laid-Open No. 64-28353, a holding band, a heat storage box, a cooling box and a cooling band have a structure in which bellows are used to prevent the invasion of outside air. No countermeasures have been taken on the side of the cooling zone where the air is blown. Therefore, fine dust, dust, iron oxide, sea salt particles and the like are directly sprayed on the steel sheet. This is also true for Japanese Patent Application Laid-Open No. 5-179415.
The same is true.
【００１０】本発明は、上記した従来の問題点に鑑みて
なされたものであり、連続溶融亜鉛めっきラインにおい
て合金化溶融亜鉛めっき鋼板や、これ以外の溶融亜鉛め
っき鋼板（ＧＩ鋼板やミニマイズド（ゼロ）スパングル
鋼板）を製造する際、鋼板表面に微細な塵・埃・酸化鉄
・海塩粒子等を直接吹き付けることがなく、その結果、
製造された合金化溶融亜鉛めっき鋼板に黒点疵を発生さ
せることのない装置を提供することを目的としている。The present invention has been made in view of the above-mentioned conventional problems, and has been made in a continuous hot-dip galvanizing line. ) When manufacturing spangle steel sheet), fine dust, dust, iron oxide, sea salt particles, etc. are not directly sprayed on the steel sheet surface, and as a result,
An object of the present invention is to provide an apparatus that does not cause black spots on a manufactured galvannealed steel sheet.
【００１１】[0011]
【課題を解決するための手段】上記した目的を達成する
ために、本発明の溶融亜鉛めっき鋼板の黒点疵防止装置
は、鋼板を冷却する冷却帯のガス吸引部から鋼板への吹
付けノズルに至る接ガス部分をステンレス鋼板で製作す
ると共に、ブロワーの入り側における冷却ガスの流速を
１．０〜３．０ｍ／ｓとなすべく、ブロワーにおける入
り側部分のダクト径を大きくし、かつ、この大きくした
ダクト部分に１５μｍ以上の粉塵を除去するフィルター
を配置している。そして、このようにすることで、接ガ
ス部分に錆が発生せず、錆が鋼板の表面に付着すること
がない。また、１５μｍ以上の微細な塵・埃・酸化鉄・
海塩粒子等はフィルターで除去され、鋼板の表面に付着
することがない。In order to achieve the above-mentioned object, the present invention provides an apparatus for preventing black spots on a hot-dip galvanized steel sheet, which comprises a nozzle for spraying a gas from a gas suction part of a cooling zone for cooling the steel sheet to the steel sheet. The contacting gas portion is made of a stainless steel plate, and the duct diameter of the inlet side portion of the blower is increased so that the flow rate of the cooling gas at the inlet side of the blower is 1.0 to 3.0 m / s. A filter for removing dust of 15 μm or more is arranged in the enlarged duct portion. By doing so, rust does not occur in the gas contact portion, and rust does not adhere to the surface of the steel sheet. In addition, fine dust, dust, iron oxide,
Sea salt particles and the like are removed by the filter and do not adhere to the surface of the steel sheet.
【００１２】[0012]
【発明の実施の形態】本発明の溶融亜鉛めっき鋼板の黒
点疵防止装置は、鋼板に溶融亜鉛めっきを施した後、付
着量制御装置で亜鉛付着量を調整し、合金化炉で加熱・
保持・冷却、あるいは、加熱・冷却して製造する合金化
溶融亜鉛めっき鋼板や、鋼板に溶融亜鉛めっきを施した
後、付着量制御装置で亜鉛付着量を調整し、冷却して製
造する溶融亜鉛めっき鋼板の表面に発生する黒点疵を防
止する装置であって、鋼板を冷却する冷却帯のガス吸引
部から鋼板への吹付けノズルに至る接ガス部分をステン
レス鋼板で製作すると共に、ブロワーの入り側における
冷却ガスの流速を１．０〜３．０ｍ／ｓとなすべく、ブ
ロワーにおける入り側部分のダクト径を大きくし、か
つ、この大きくしたダクト部分に１５μｍ以上の粉塵を
除去するフィルターを配置したものである。BEST MODE FOR CARRYING OUT THE INVENTION The apparatus for preventing black spots on a hot-dip galvanized steel sheet according to the present invention is to apply a hot-dip galvanizing method to a steel sheet, then adjust the zinc adhesion amount by an adhesion amount control device, and then heat the steel sheet by an alloying furnace.
An alloyed hot-dip galvanized steel sheet manufactured by holding and cooling or heating and cooling, or hot-dip galvanized steel sheet, then adjusting the zinc coating amount with a coating amount controller and cooling to manufacture This device prevents black spots from being generated on the surface of a plated steel sheet. The gas contact part from the gas suction part of the cooling zone that cools the steel sheet to the spray nozzle on the steel sheet is made of stainless steel sheet, and the blower is inserted. In order to make the flow rate of the cooling gas on the side of the blower 1.0 to 3.0 m / s, the diameter of the duct on the entrance side of the blower is increased, and a filter for removing dust of 15 μm or more is arranged in the enlarged duct. It was done.
【００１３】すなわち、本発明では、ＧＡ鋼板やこれ以
外の溶融亜鉛めっき鋼板を製造する工程で、鋼板に溶融
亜鉛めっきを施した後、付着量制御装置で亜鉛付着量を
調整し、合金化炉で加熱・保持・冷却、または、加熱・
冷却する時、あるいは、亜鉛付着量の調整後、冷却する
時に、鋼板を冷却するために吹き付けるガス中に含ま
れ、黒点疵発生の原因となる微細な塵・埃・酸化鉄・海
塩粒子等を除去するために、冷却帯のブロワーの入り側
に、フィルターを設置するのである。That is, in the present invention, in the step of manufacturing a GA steel sheet or another hot-dip galvanized steel sheet, after applying a hot-dip galvanizing method to the steel sheet, the amount of zinc coating is adjusted by a coating amount control device, and the alloying furnace is manufactured. Heating / holding / cooling, or heating /
When cooling, or after adjusting the amount of zinc deposition, when cooling, fine dust, dust, iron oxide, sea salt particles, etc., contained in the gas blown to cool the steel sheet and cause black spots A filter is installed on the inlet side of the blower in the cooling zone in order to remove air.
【００１４】そして、本発明者が冷却ガス中に含まれる
微細な塵・埃・酸化鉄・海塩粒子等を採取し、検査した
結果、冷却ガス中に含まれる砂、酸化鉄、海塩粒子、砥
粒の平均粒子径は下記表１に示す如くであった。The present inventor has collected and inspected fine dust, dust, iron oxide, sea salt particles and the like contained in the cooling gas. As a result, sand, iron oxide and sea salt particles contained in the cooling gas have been obtained. The average particle size of the abrasive grains was as shown in Table 1 below.
【００１５】[0015]
【表１】 [Table 1]
【００１６】また、本発明者の実験によれば、１５μｍ
未満の微細な塵・埃・酸化鉄・海塩粒子等であれば、鋼
板の表面に付着して、トップロール等で鋼板の表面に押
し込まれても、製品の品質に影響を及ぼさない。従っ
て、本発明では、フィルターは粒径が１５μｍ以上の塵
・埃・酸化鉄・海塩粒子等を除去できるものを採用する
こととした。According to an experiment conducted by the present inventor, 15 μm
If the particles are less than fine particles such as dust, dust, iron oxide, and sea salt, they will not affect the quality of the product even if they adhere to the surface of the steel sheet and are pushed into the surface of the steel sheet by a top roll or the like. Therefore, in the present invention, a filter capable of removing dust, dust, iron oxide, sea salt particles and the like having a particle size of 15 μm or more is adopted.
【００１７】また、フィルターを通過する冷却ガスの流
速は３．０ｍ／ｓより大きくなると、圧力損失が大きく
なりすぎてブロワーやファンを必要以上に大きくしなけ
ればならなくなるので、本発明では、ブロワーにおける
入り側部分のダクト径を大きくして、ブロワーの入り
側、特に、フィルターボックス部では、１．０〜３．０
ｍ／ｓの流速で冷却ガスが流れるようにした。If the flow rate of the cooling gas passing through the filter is higher than 3.0 m / s, the pressure loss becomes too large and the blower and the fan must be made larger than necessary. The diameter of the duct at the entrance side of the blower is increased, and the entrance side of the blower, particularly, at the filter box, is 1.0 to 3.0.
The cooling gas was allowed to flow at a flow rate of m / s.
【００１８】また、本発明において、鋼板を冷却する冷
却帯のガス吸引部から鋼板への吹付けノズルに至る接ガ
ス部分をステンレス鋼板で製作するのは、以下の理由に
よるものである。すなわち、前記接ガス部分に、防錆処
理剤を塗布した鋼板を使用した場合には、防錆処理剤が
剥がれた後は錆が発生する。また、めっき鋼板を使用し
たとしても、１〜２年も経過すると、めっき鋼板の表面
に白錆等が発生する。そして、これらの錆が冷却ガス中
に含まれ、鋼板を冷却する時に同時に鋼板に吹き付けら
れると、黒点疵の発生要因となる。これに対して、ステ
ンレス鋼板を採用した場合には、防錆処理剤を塗布した
鋼板は勿論、めっき鋼板よりも耐食性に優れていて、錆
や白錆等が発生せず、また、めっき鋼板よりも溶接性が
良好であるからである。なお、ステンレス鋼板であれ
ば、特に限定しないが、ＳＵＳ３１６ステンレス鋼のほ
うが一般的に用いられるＳＵＳ３０４ステンレス鋼より
も耐孔性及び耐食性が良好で、溶接性がすぐれているの
で、ＳＵＳ３１６ステンレス鋼を採用することが望まし
い。Further, in the present invention, the gas contact portion from the gas suction portion of the cooling zone for cooling the steel plate to the spray nozzle for the steel plate is made of a stainless steel plate for the following reasons. That is, when a steel sheet coated with a rust preventive agent is used in the gas contact portion, rust is generated after the rust preventive agent is peeled off. Even if plated steel sheets are used, white rust or the like is generated on the surfaces of the plated steel sheets after one to two years. If these rusts are contained in the cooling gas and are sprayed on the steel sheet at the same time as the steel sheet is cooled, it causes black spots. On the other hand, when a stainless steel plate is used, not only steel plates coated with a rust preventive agent, but also have better corrosion resistance than plated steel plates, do not generate rust, white rust, etc. This is also because the weldability is good. As long as the stainless steel plate is not particularly limited, SUS316 stainless steel is used because SUS316 stainless steel has better porosity and corrosion resistance than SUS304 stainless steel generally used and has excellent weldability. It is desirable to do.
【００１９】[0019]
【実施例】以下、本発明に係る溶融亜鉛めっき鋼板の黒
点疵防止装置を図１及び図２に示す一実施例に基づいて
説明する。図１は本発明に係る溶融亜鉛めっき鋼板の黒
点疵防止装置を適用した合金化溶融亜鉛めっき鋼板製造
ラインの概略説明図、図２は本発明に係る溶融亜鉛めっ
き鋼板の黒点疵防止装置を構成するフィルターボックス
の正面図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An apparatus for preventing black spots on a hot-dip galvanized steel sheet according to the present invention will be described below with reference to one embodiment shown in FIGS. FIG. 1 is a schematic explanatory view of a production line for an alloyed hot-dip galvanized steel sheet to which the apparatus for preventing black spots of a hot-dip galvanized steel sheet according to the present invention is applied, and FIG. It is a front view of the filter box which performs.
【００２０】図面において、１は連続焼鈍炉で前処理さ
れた鋼板であり、溶融亜鉛めっき槽２に浸漬された後、
シンクロール３を経てガスワイピング装置４でめっき付
着量を調整されて、公知の機能であるオフライン退避機
能を有する合金化処理装置の加熱帯５で加熱される。In the drawing, reference numeral 1 denotes a steel sheet which has been pretreated in a continuous annealing furnace.
The amount of plating is adjusted by a gas wiping device 4 after passing through a sink roll 3, and is heated in a heating zone 5 of an alloying apparatus having an off-line retreat function, which is a known function.
【００２１】６は加熱帯５の出口に設置されたエアーカ
ーテンであり、加熱帯５で使用された燃焼排ガスがライ
ン外に排出されるのを防止するものである。加熱帯５で
加熱処理された鋼板１は、保持帯の機能と、屋外の大気
を吸引し、鋼板１に吹付けて冷却する冷却帯の機能を有
する保持帯兼用冷却帯７で冷却保持、または保持された
後、Ｎｏ１空冷帯８、Ｎｏ２空冷帯９で冷却され、その
後、トップロール１０に至り次工程に移る。なお、１１
はシンクロール３からトップロール１０に至るまでに鋼
板１がばたつくのを防止するタッチロールである。Reference numeral 6 denotes an air curtain installed at the exit of the heating zone 5 for preventing the combustion exhaust gas used in the heating zone 5 from being discharged out of the line. The steel sheet 1 which has been heat-treated in the heating zone 5 is cooled and held by the holding band / combination cooling zone 7 having the function of a holding zone and the function of a cooling zone for sucking outdoor air and spraying and cooling the steel sheet 1, or After being held, it is cooled in the No. 1 air cooling zone 8 and the No. 2 air cooling zone 9, and then reaches the top roll 10 and moves to the next step. Note that 11
Is a touch roll for preventing the steel plate 1 from fluttering from the sink roll 3 to the top roll 10.
【００２２】ところで、前記保持帯兼用冷却帯７は、冷
却帯本体７ａと、保持帯部７ｂと、屋外の大気を吸引す
るブロワー７ｃと、冷却ガスの風量を調整するサクショ
ンダンパー７ｄと、ブロワー７ｃの吸い込み音を消音す
るサイレンサー７ｅと、ブロワー７ｃに吸引される大気
中に含まれる塵・埃・酸化鉄・海塩粒子等を除去するフ
ィルターボックス７ｆ、及びこれらをつなぐダクト７ｇ
とで構成されている。The holding band / cooling band 7 includes a cooling band main body 7a, a holding band portion 7b, a blower 7c for sucking outdoor air, a suction damper 7d for adjusting a flow rate of cooling gas, and a blower 7c. 7e that silences the suction noise of air, a filter box 7f that removes dust, dust, iron oxide, sea salt particles and the like contained in the air sucked by the blower 7c, and a duct 7g that connects these.
It is composed of
【００２３】また、Ｎｏ１空冷帯８，Ｎｏ２空冷帯９
は、屋外の大気を吸引して鋼板１に吹付けて冷却するも
ので、それぞれ、冷却帯本体８ａ，９ａと、屋外の大気
を吸引するブロワー８ｂ，９ｂと、冷却ガスの風量を調
整するサクションダンパー８ｃ，９ｃと、ブロワー８
ｂ，９ｂの吸い込み音を消音するサイレンサー８ｄ，９
ｄと、ブロワー８ｂ，９ｂに吸引される大気中に含まれ
る塵・埃・酸化鉄・海塩粒子等を除去するフィルターボ
ックス８ｅ，９ｅ、及びこれらをつなぐダクト８ｆ，９
ｆとで構成されている。No. 1 air cooling zone 8, No. 2 air cooling zone 9
Is a device that sucks the outdoor air and blows it to the steel plate 1 to cool it. The cooling zone main bodies 8a and 9a, the blowers 8b and 9b that suck the outdoor air, and the suction that adjusts the air volume of the cooling gas are provided. Damper 8c, 9c and blower 8
b, 9b silencers 8d, 9 for silencing the suction sound
d, filter boxes 8e, 9e for removing dust, dust, iron oxide, sea salt particles and the like contained in the air sucked by the blowers 8b, 9b, and ducts 8f, 9 connecting these.
f.
【００２４】本発明に係る溶融亜鉛めっき鋼板の黒点疵
防止装置は、例えば上記したような合金化処理装置に適
用して、製造される合金化溶融亜鉛めっき鋼板の黒点疵
を防止する装置であり、次のような構成である。The apparatus for preventing black spots on a hot-dip galvanized steel sheet according to the present invention is an apparatus for preventing black spots on a manufactured hot-dip galvanized steel sheet by applying it to, for example, the above-described alloying apparatus. The configuration is as follows.
【００２５】すなわち、本発明に係る溶融亜鉛めっき鋼
板の黒点疵防止装置は、鋼板１を冷却または保持する保
持帯兼用冷却帯７，Ｎｏ１空冷帯８，Ｎｏ２空冷帯９の
ガス吸引部から鋼板１への吹付けノズルに至る接ガス部
分、すなわち、保持帯兼用冷却帯７では、冷却帯本体７
ａ，保持帯部７ｂ，ブロワー７ｃ，サクションダンパー
７ｄ，サイレンサー７ｅ，フィルターボックス７ｆ，及
びダクト７ｇを、また、Ｎｏ１空冷帯８，Ｎｏ２空冷帯
９では、冷却帯本体８ａ，９ａ，ブロワー８ｂ，９ｂ，
サクションダンパー８ｃ，９ｃ，サイレンサー８ｄ，９
ｄ，フィルターボックス８ｅ，９ｅ，及びダクト８ｆ，
９ｆを例えばＳＵＳ３１６ステンレス鋼板で製作するの
である。That is, the apparatus for preventing black spots on a hot-dip galvanized steel sheet according to the present invention comprises a cooling zone 7 for cooling or holding the steel sheet 1, a No. 1 air-cooling zone 8, and a No. 2 air-cooling zone 9. In the gas contact portion reaching the spray nozzle to the nozzle, that is, in the holding zone / cooling zone 7, the cooling zone body 7
a, the holding band 7b, the blower 7c, the suction damper 7d, the silencer 7e, the filter box 7f, and the duct 7g. In the No. 1 air cooling zone 8, No. 2 air cooling zone 9, the cooling zone main bodies 8a, 9a, the blowers 8b, 9b. ,
Suction damper 8c, 9c, silencer 8d, 9
d, filter boxes 8e, 9e, and duct 8f,
9f is made of, for example, a SUS316 stainless steel plate.
【００２６】加えて、本発明に係る溶融亜鉛めっき鋼板
の黒点疵防止装置では、ブロワー７ｃ，８ｂ，９ｂの入
り側における冷却ガスの流速を１．０〜３．０ｍ／ｓと
なすべく、例えば図２に示すように、フィルターボック
ス７ｆ，８ｅ，９ｅのダクト径を大きくし、かつ、この
大きくしたダクト部分に１５μｍ以上の塵・埃・酸化鉄
・海塩粒子等を除去するフィルター７ｈ，８ｇ，９ｇを
配置しているのである。In addition, in the apparatus for preventing black spots on a hot-dip galvanized steel sheet according to the present invention, the flow rate of the cooling gas at the entry side of the blowers 7c, 8b, 9b is set to 1.0 to 3.0 m / s, for example. As shown in FIG. 2, filters 7h, 8g for increasing the duct diameter of filter boxes 7f, 8e, 9e and for removing dust, dust, iron oxide, sea salt particles and the like having a size of 15 μm or more in the enlarged duct portion. , 9g are arranged.
【００２７】ところで、フィルターボックス７ｆ，８
ｅ，９ｅへのフィルター７ｈ，８ｇ，９ｇの配置手段に
ついては、特に限定されるものではないが、例えば枠内
にフィルター７ｈ，８ｇ，９ｇを固定したものを、フィ
ルターボックス７ｆ，８ｅ，９ｅの例えば幅方向に固定
したレールに沿って摺動させることで配置するようにす
れば、フィルター７ｈ，８ｇ，９ｇの取り替えが容易に
行えることになる。この時、レールとフィルターボック
ス７ｆ，８ｅ，９ｅとはシール溶接しておくことは勿論
であり、また、フィルター７ｈ，８ｇ，９ｇを固定した
枠間、及び枠とフィルターボックス７ｆ，８ｅ，９ｅ間
は弾力性部材を介在させて、大気が全てフィルター７
ｈ，８ｇ，９ｇを通るようにしておくことは言うまでも
ない。By the way, the filter boxes 7f, 8
The means for arranging the filters 7h, 8g, 9g on the filters e, 9e is not particularly limited. For example, a filter in which the filters 7h, 8g, 9g are fixed in a frame is provided in the filter boxes 7f, 8e, 9e. For example, if the filter is arranged by sliding along a rail fixed in the width direction, the filters 7h, 8g, and 9g can be easily replaced. At this time, the rails and the filter boxes 7f, 8e, 9e are, of course, sealed with a seal, and between the frames to which the filters 7h, 8g, 9g are fixed, and between the frames and the filter boxes 7f, 8e, 9e. Is a filter 7 with an elastic material
Needless to say, pass through h, 8g and 9g.
【００２８】上記したような本発明に係る溶融亜鉛めっ
き鋼板の黒点疵防止装置を、合金化処理装置に適用した
場合には、屋外の大気中に含まれる黒点疵発生の原因と
なりうる、粒子径が１５μｍ以上の塵・埃・酸化鉄・海
塩粒子等を除去できると共に、接ガス部分も錆が発生し
なくなるので、合金化溶融亜鉛めっき鋼板の黒点疵発生
の割合が、従来は平均１．６件／月であったのが、０件
／月になった。When the apparatus for preventing black spots on a hot-dip galvanized steel sheet according to the present invention as described above is applied to an alloying apparatus, the particle size which may cause the generation of black spots contained in outdoor air is considered. Can remove dust, dust, iron oxide, sea salt particles, and the like having a size of 15 μm or more, and rust does not occur in the gas contact portion. From 6 cases / month to 0 cases / month.
【００２９】また、合金化処理を行わない溶融亜鉛めっ
き鋼板（ＧＩ鋼板）を製造する際に、本発明に係る溶融
亜鉛めっき鋼板の黒点疵防止装置を適用した場合にも、
溶融亜鉛めっき鋼板の黒点疵発生の割合が、従来は平均
０．７件／月であったのが、０件／月になった。Further, when manufacturing a hot-dip galvanized steel sheet (GI steel sheet) that is not subjected to alloying treatment, the apparatus for preventing black spots on a hot-dip galvanized steel sheet according to the present invention is also applicable.
The rate of occurrence of black spots on the hot-dip galvanized steel sheet was reduced from 0.7 cases / month on average to 0 cases / month.
【００３０】[0030]
【発明の効果】以上説明したように、本発明に係る溶融
亜鉛めっき鋼板の黒点疵防止装置によれば、従来、殆ど
除去されずに次の工程に送られていた、黒点疵の原因と
なりうる微細な塵・埃・酸化鉄・海塩粒子等を除去でき
ると共に、接ガス部分に錆が発生しなくなるので、黒点
疵のない高品質な溶融亜鉛めっき鋼板を製造できる。As described above, according to the apparatus for preventing black spots on a hot-dip galvanized steel sheet according to the present invention, black spots which have been conventionally sent to the next step without being removed can be a cause. Fine dust, dust, iron oxide, sea salt particles and the like can be removed, and rust does not occur in the gas contact portion, so that a high quality hot-dip galvanized steel sheet without black spots can be manufactured.
【図１】本発明に係る溶融亜鉛めっき鋼板の黒点疵防止
装置を適用した合金化溶融亜鉛めっき鋼板製造ラインの
概略説明図である。FIG. 1 is a schematic explanatory view of a production line for an alloyed hot-dip galvanized steel sheet to which a device for preventing black spots on a hot-dip galvanized steel sheet according to the present invention is applied.
【図２】本発明に係る溶融亜鉛めっき鋼板の黒点疵防止
装置を構成するフィルターボックスの正面図である。FIG. 2 is a front view of a filter box included in the apparatus for preventing black spots on a galvanized steel sheet according to the present invention.
１ 鋼板 ７ 保持帯兼用冷却帯 ７ａ 冷却帯本体 ７ｂ 保持帯部 ７ｃ ブロワー ７ｄ サクションダンパー ７ｅ サイレンサー ７ｆ フィルターボックス ７ｇ ダクト ７ｈ フィルター ８ Ｎｏ１冷却帯 ８ａ 冷却帯本体 ８ｂ ブロワー ８ｃ サクションダンパー ８ｄ サイレンサー ８ｅ フィルターボックス ８ｆ ダクト ８ｇ フィルター ９ Ｎｏ２冷却帯 ９ａ 冷却帯本体 ９ｂ ブロワー ９ｃ サクションダンパー ９ｄ サイレンサー ９ｅ フィルターボックス ９ｆ ダクト ９ｇ フィルター DESCRIPTION OF SYMBOLS 1 Steel plate 7 Holding band combined cooling band 7a Cooling band main body 7b Holding band part 7c Blower 7d Suction damper 7e Silencer 7f Filter box 7g Duct 7h Filter 8 No1 cooling band 8a Cooling band main body 8b Blower 8c Suction damper 8e Filter silencer 8e Filter silencer 8g Filter 9 No2 Cooling Zone 9a Cooling Zone Main Body 9b Blower 9c Suction Damper 9d Silencer 9e Filter Box 9f Duct 9g Filter
Claims (1)
量制御装置で亜鉛付着量を調整し、合金化炉で加熱・保
持・冷却、あるいは、加熱・冷却して製造する合金化溶
融亜鉛めっき鋼板や、鋼板に溶融亜鉛めっきを施した
後、付着量制御装置で亜鉛付着量を調整し、冷却して製
造する溶融亜鉛めっき鋼板の表面に発生する黒点疵を防
止する装置であって、鋼板を冷却する冷却帯のガス吸引
部から鋼板への吹付けノズルに至る接ガス部分をステン
レス鋼板で製作すると共に、ブロワーの入り側における
冷却ガスの流速を１．０〜３．０ｍ／ｓとなすべく、ブ
ロワーにおける入り側部分のダクト径を大きくし、か
つ、この大きくしたダクト部分に１５μｍ以上の粉塵を
除去するフィルターを配置したことを特徴とする溶融亜
鉛めっき鋼板の黒点疵防止装置。1. After hot-dip galvanizing a steel sheet, the amount of zinc is adjusted by a coating amount control device, and the alloyed hot-dip zinc is produced by heating / holding / cooling in an alloying furnace or heating / cooling. Coated steel sheet, after applying hot-dip galvanizing to the steel sheet, adjust the zinc adhesion amount with an adhesion amount control device, is a device to prevent black spots generated on the surface of the hot-dip galvanized steel sheet produced by cooling, The gas contact part from the gas suction part of the cooling zone for cooling the steel sheet to the spray nozzle to the steel sheet is made of stainless steel sheet, and the flow rate of the cooling gas on the inlet side of the blower is 1.0 to 3.0 m / s. In order to achieve this, the diameter of the duct on the entrance side of the blower is increased, and a filter that removes dust of 15 μm or more is disposed in the enlarged duct portion. Apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10892197A JP3603534B2 (en) | 1997-04-25 | 1997-04-25 | Black spot flaw prevention device for hot-dip galvanized steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10892197A JP3603534B2 (en) | 1997-04-25 | 1997-04-25 | Black spot flaw prevention device for hot-dip galvanized steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10298730A true JPH10298730A (en) | 1998-11-10 |
| JP3603534B2 JP3603534B2 (en) | 2004-12-22 |
Family
ID=14497033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10892197A Expired - Fee Related JP3603534B2 (en) | 1997-04-25 | 1997-04-25 | Black spot flaw prevention device for hot-dip galvanized steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3603534B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002309359A (en) * | 2001-04-12 | 2002-10-23 | Nkk Corp | Method for manufacturing hot-dip metal coated steel strip |
| WO2008044716A1 (en) * | 2006-10-13 | 2008-04-17 | Nippon Steel Corporation | Apparatus and process for producing steel sheet plated by hot dipping with alloyed zinc |
| JP2008115462A (en) * | 2006-10-13 | 2008-05-22 | Nippon Steel Corp | Production equipment and production method of alloyed hot dip galvanized steel sheet |
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| CN104264090A (en) * | 2014-09-28 | 2015-01-07 | 江苏大力神科技股份有限公司 | Zinc spangle controlling device |
| KR20210072444A (en) * | 2019-12-09 | 2021-06-17 | 주식회사 포스코 | Furnace management system in continuous galvaniging line |
| WO2022053847A1 (en) * | 2020-09-08 | 2022-03-17 | Arcelormittal | Filtration system |
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- 1997-04-25 JP JP10892197A patent/JP3603534B2/en not_active Expired - Fee Related
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| JP2002309359A (en) * | 2001-04-12 | 2002-10-23 | Nkk Corp | Method for manufacturing hot-dip metal coated steel strip |
| JP4736223B2 (en) * | 2001-04-12 | 2011-07-27 | Ｊｆｅスチール株式会社 | Manufacturing method of molten metal plated steel strip |
| US8402909B2 (en) | 2006-10-13 | 2013-03-26 | Nippon Steel & Sumitomo Metal Corporation | Production facility and production process for hot dip galvannealed steel plate |
| WO2008044716A1 (en) * | 2006-10-13 | 2008-04-17 | Nippon Steel Corporation | Apparatus and process for producing steel sheet plated by hot dipping with alloyed zinc |
| JP2008115462A (en) * | 2006-10-13 | 2008-05-22 | Nippon Steel Corp | Production equipment and production method of alloyed hot dip galvanized steel sheet |
| US8844462B2 (en) | 2006-10-13 | 2014-09-30 | Nippon Steel & Sumitomo Metal Corporation | Production facility and production process for hot dip galvannealed steel plate |
| KR101178614B1 (en) * | 2006-10-13 | 2012-08-30 | 신닛뽄세이테쯔 카부시키카이샤 | Apparatus and process for producing steel sheet plated by hot dipping with alloyed zinc |
| JP2009013481A (en) * | 2007-07-06 | 2009-01-22 | Nippon Steel Corp | Alloying furnace equipment |
| KR101048167B1 (en) * | 2008-10-23 | 2011-07-08 | 현대하이스코 주식회사 | Continuous hot dip plating device that provides excellent surface quality and manufacturing method using the same |
| CN104264090A (en) * | 2014-09-28 | 2015-01-07 | 江苏大力神科技股份有限公司 | Zinc spangle controlling device |
| KR20210072444A (en) * | 2019-12-09 | 2021-06-17 | 주식회사 포스코 | Furnace management system in continuous galvaniging line |
| WO2022053847A1 (en) * | 2020-09-08 | 2022-03-17 | Arcelormittal | Filtration system |
| WO2022053927A1 (en) * | 2020-09-08 | 2022-03-17 | Arcelormittal | Filtration system |
| CN115867686A (en) * | 2020-09-08 | 2023-03-28 | 安赛乐米塔尔公司 | Filter system |
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