JP2012092362A - Apparatus and method for producing hot dip metal coated steel strip - Google Patents
Apparatus and method for producing hot dip metal coated steel strip Download PDFInfo
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本発明は、溶融めっきプロセスにおいて、通常通板速度においても、また高速通板時においても、溶融めっき浴上に発生するトップドロスの発生量を低減できる溶融金属めっき鋼帯製造装置及び溶融金属めっき鋼帯の製造方法に関するものである。 The present invention relates to a molten metal plating steel strip manufacturing apparatus and a molten metal plating that can reduce the amount of top dross generated on a hot dipping bath in a hot dipping process, both at a normal sheet feeding speed and at a high sheet feeding speed. The present invention relates to a method for manufacturing a steel strip.
連続溶融めっきプロセス等においては、溶融金属めっき鋼帯は、図８に示すように、一般に鋼帯１を、スナウト２内を通過させ、めっき槽３内に溶融金属が満たされているめっき浴４に浸漬させ、シンクロール５で方向転換した後、該鋼帯１を鉛直上方に引き上げる工程の後に、鋼帯表面に付着した溶融金属が板幅方向および板長手方向に均一に所定のめっき厚になるように、この鋼帯１を挟んで対向して設けた鋼帯幅方向に延在するワイピングノズル６から加圧気体を鋼帯上に噴出させて、余剰な溶融金属を絞り取り、溶融金属の付着量（めっき付着量）を制御することで製造される。 In a continuous hot dipping process or the like, as shown in FIG. 8, the hot metal plating steel strip generally passes the steel strip 1 through the snout 2 and the plating bath 4 in which the hot metal is filled in the plating tank 3. And after the step of pulling the steel strip 1 vertically upward, the molten metal adhering to the surface of the steel strip has a uniform plating thickness in the plate width direction and the plate longitudinal direction. As shown in the figure, a pressurized gas is jetted onto the steel strip from a wiping nozzle 6 extending in the steel strip width direction provided opposite to the steel strip 1 so as to squeeze out the excess molten metal. It is manufactured by controlling the adhesion amount (plating adhesion amount).
ガスワイピング部での鋼帯走行位置を安定化させるために、通常、シンクロール５上方の浴面下のめっき浴中に、サポートロール７が配置され、また合金化処理等を行う場合は必要に応じてワイピングノズル６上方にサポートロール８が設置される。 In order to stabilize the steel strip traveling position in the gas wiping part, the support roll 7 is usually disposed in the plating bath below the bath surface above the sink roll 5, and is necessary when alloying treatment is performed. Accordingly, the support roll 8 is installed above the wiping nozzle 6.
ワイピングノズル６は、多様な鋼帯幅に対応すると同時に鋼帯引き上げ時の幅方向のズレなどに対応するため、通常、鋼帯幅より長く、すなわち鋼帯１の幅端部より外側まで延びている。このような溶融金属めっき鋼帯製造装置では、衝突した噴流の乱れによって鋼帯下方に落下する溶融金属が周囲に飛び散る、いわゆるエッジスプラッシュが発生する。また同時に、図９に示すように、噴射されたガスが鋼帯に沿って流下してめっき浴面を激しく揺らしていわゆる浴面スプラッシュが発生する。エッジスプラッシュと浴面スプラッシュがトップドロスとなることで鋼帯の表面品質の低下を招くとともに、トップドロスを作業者が除去する必要がある等のデメリットが生じる。 The wiping nozzle 6 is usually longer than the width of the steel strip, that is, extending beyond the width end portion of the steel strip 1 in order to cope with various widths of the steel strip and at the same time shift in the width direction when the steel strip is pulled up. Yes. In such a molten metal-plated steel strip manufacturing apparatus, so-called edge splash occurs in which molten metal falling below the steel strip is scattered around due to the turbulence of the impinging jet. At the same time, as shown in FIG. 9, the injected gas flows down along the steel strip and vigorously shakes the plating bath surface, so-called bath surface splash occurs. When the edge splash and the bath surface splash become the top dross, the surface quality of the steel strip is deteriorated, and there are disadvantages such as the operator needing to remove the top dross.
また、連続プロセスにおいて、生産量を増加させるには、鋼帯通板速度を増加させればよいが、連続溶融めっきプロセスにおいてガスワイピング方式でめっき付着量を制御する場合、溶融金属の粘性により、鋼帯通板速度の増加に伴って鋼帯のめっき浴通過直後の初期付着量（持ち上げ量）が増加するため、めっき付着量を一定範囲内に制御するには、ワイピングガス圧力をより高圧に設定せざるを得ず、それによってスプラッシュおよびトップドロスが大幅に増加し、トップドロス除去作業頻度が増加する、トップドロス排出によって持ち出し亜鉛が増加して亜鉛歩留りが低下する等の問題がある。 Moreover, in order to increase the production amount in the continuous process, the steel plate passing speed may be increased. However, in the case of controlling the coating amount by the gas wiping method in the continuous hot dipping process, due to the viscosity of the molten metal, Since the initial adhesion amount (lifting amount) immediately after passing through the plating bath of the steel strip increases as the steel strip passage speed increases, the wiping gas pressure must be increased to control the plating coverage within a certain range. Therefore, there is a problem that splash and top dross increase significantly, the frequency of top dross removal work increases, and the zinc taken out by top dross discharge increases and the zinc yield decreases.
上記の問題を解決するため、トップドロスから酸化亜鉛を分離・回収する装置が以下の通り開示されている。 In order to solve the above problems, an apparatus for separating and recovering zinc oxide from top dross is disclosed as follows.
特許文献１には、金属めっき槽壁面近くに設けた、窒素ガスを供給したガスリフトポンプによってトップドロスをドロス分離器に送り、ドロス分離器内では塩化アンモニウム等の還元用薬剤と反応させ、還元されためっき金属をめっき浴へ戻すドロス回収再生装置が開示されている。 In Patent Document 1, the top dross is sent to the dross separator by a gas lift pump provided near the metal plating tank wall and supplied with nitrogen gas. In the dross separator, the top dross is reacted with a reducing agent such as ammonium chloride to be reduced. An apparatus for recovering and recovering dross that returns the plated metal to the plating bath is disclosed.
特許文献２には、めっき槽内に設けたドロス回収箱に集められたドロスにアルミニウム濃度が０．５〜１０ｗｔ％になるようにアルミニウムを添加した後に攪拌し、上部に浮遊したトップドロスを回収するトップドロスの分離回収装置が開示されている。 In Patent Document 2, aluminum is added to the dross collected in the dross collection box provided in the plating tank so that the aluminum concentration is 0.5 to 10 wt%, and then stirred, and the top dross floating above is collected. A top dross separation and recovery device is disclosed.
ところが、特許文献１に開示された装置では、高温のめっき金属を大型ポンプで移動させるために、間欠的に使用すると配管詰まり等のトラブルが発生し、連続使用すると操業条件によって増減するトップドロスに応じた分離処理が困難であるため、メンテナンス・コスト面での問題があって安定使用が困難であることがわかった。 However, in the apparatus disclosed in Patent Document 1, troubles such as clogging of pipes occur when used intermittently in order to move high-temperature plated metal with a large pump, and the top dross that increases or decreases depending on operating conditions when used continuously. It was found that stable separation was difficult due to problems in maintenance and cost because it was difficult to perform the separation process.
特許文献２に開示された装置では、ドロス回収箱の大きさが限定されるため、高速通板してトップドロスが増加したときに対応しきれなくなる、また実作業として、トップドロスを回収箱に掻き入れる作業、回収箱内にアルミニウムを添加し攪拌する作業、回収箱からトップドロスを排出する作業が発生し、亜鉛歩留り向上によるコスト低下より作業コストの方が大きくなる等の問題があった。 In the apparatus disclosed in Patent Document 2, since the size of the dross collection box is limited, it becomes impossible to respond when the top dross increases due to high-speed feeding, and as an actual work, the top dross is used as the collection box. There were problems such as scraping, adding and stirring aluminum in the recovery box, and discharging the top dross from the recovery box, resulting in higher work costs than lower costs due to improved zinc yield.
また、高速通板して比較的薄目付けの製品を製造する場合（例えば、溶融亜鉛めっき鋼帯の製造においては２．５ｍ／ｓ以上で、片面付着量が５０ｇ／ｍ２以下）、ガスワイピングで絞られて流下する余剰溶融めっき金属がワイピングノズルからの噴射ガスを巻き込む割合が多くなり、結果として形成するトップドロスには気泡が多く含まれることがわかった。ワイピングガスに非酸化性ガス（窒素等）を使用してめっき金属の酸化を少なくしても、トップドロス量が大幅に減少することはなく、気泡がより多く含まれて嵩密度が低下することで排出するトップドロスの体積が増加する問題があった。 Also, when producing relatively thin products by passing through high speed (for example, in the production of hot dip galvanized steel strip, it is 2.5 m / s or more and the amount of adhesion on one side is 50 g / m 2 or less). It was found that the surplus hot-dipped metal that was squeezed and flowed down increased the proportion of the gas injected from the wiping nozzle, and the resulting top dross contained many bubbles. Even if non-oxidizing gas (nitrogen, etc.) is used as the wiping gas to reduce the oxidation of the plating metal, the amount of top dross will not be significantly reduced, and more bubbles will be contained and the bulk density will be reduced. There was a problem that the volume of the top dross discharged at the time increased.
気泡部分にめっき金属が入り込むと、例えばＡｌ：０．１２〜０．１５％の低アルミ濃度の溶融亜鉛めっき浴において、浴温が４６０〜４７０℃に保たれていても、浴面上に溜まったトップドロスの表面温度を測定すると４２０〜４３０℃で亜鉛融点近くまで低下しており、溶融亜鉛の粘度低下によって酸化亜鉛や気泡と純亜鉛とが分離しにくい状態になっていることがわかった。そのため、トップドロスを排出するとめっき金属も多く排出される問題があった。すなわち、特許文献２の装置では、高速通板時に、作業性、コスト面の問題があった。 When the plating metal enters the bubble portion, for example, in a hot dip galvanizing bath having a low aluminum concentration of Al: 0.12 to 0.15%, even if the bath temperature is maintained at 460 to 470 ° C., it accumulates on the bath surface. When the surface temperature of the top dross was measured, it was found to be close to the melting point of zinc at 420 to 430 ° C., and it was found that zinc oxide, bubbles and pure zinc were difficult to separate due to a decrease in the viscosity of molten zinc. . Therefore, there is a problem that when the top dross is discharged, a large amount of plating metal is discharged. That is, the apparatus of Patent Document 2 has problems in terms of workability and cost during high-speed feeding.
本発明は、上記問題点を考慮し、より簡易な方法で、通常通板速度においても、また高速通板時においても、トップドロスの発生量を低減するとともに、トップドロス排出によるめっき金属の持ち出し量を減少することができる溶融金属めっき鋼帯製造装置及び溶融金属めっき鋼帯の製造方法を提供することを課題とする。 In consideration of the above problems, the present invention reduces the amount of top dross generated at a normal plate speed and at a high speed plate by a simpler method, and takes out plated metal by discharging the top dross. It is an object of the present invention to provide a molten metal plated steel strip manufacturing apparatus and a method of manufacturing a molten metal plated steel strip that can reduce the amount.
本発明者らは鋭意検討を重ねた。そして、気泡を多く含んだトップドロスは、最表面温度がめっき浴温程度になるように保熱されていれば、所定時間保熱静置するだけで十分に脱気され、同時に酸化金属とめっき金属との分離も進むことがわかった。したがって、金属めっき浴上に浮いたトップドロスの温度をめっき浴温程度になるように効率良く保温することで、上記課題を解決できることを見出し、本発明を完成させた。 The present inventors made extensive studies. If the top dross containing a large amount of air bubbles is kept warm so that the outermost surface temperature is about the temperature of the plating bath, it can be sufficiently deaerated just by keeping it warm for a predetermined time, and at the same time, the metal oxide and the plating are plated. It was found that separation from metal also progressed. Therefore, the inventors have found that the above problem can be solved by efficiently keeping the temperature of the top dross floating on the metal plating bath so as to be about the plating bath temperature, and have completed the present invention.
上記課題を解決する本発明の手段は下記のとおりである。 Means of the present invention for solving the above-mentioned problems are as follows.
［１］めっき槽内の溶融金属めっき浴から連続的に引き上げられる鋼帯の表面に、ワイピングノズルから気体を吹き付け、鋼帯表面のめっき付着量の制御を行う溶融金属めっき鋼帯の製造装置において、鋼帯引き上げ部前面のめっき槽壁側に少なくとも鋼帯引き上げ部前面のめっき浴面の３０％以上を覆う遮蔽板と、鋼帯引き上げ部とスナウトに挟まれるめっき浴面のスナウト側に少なくとも鋼帯引き上げ部とスナウトに挟まれるめっき浴面の３０％以上を覆う遮蔽板を、各々めっき浴面と間隔をあけて設けたことを特徴とする溶融金属めっき鋼帯製造装置。 [1] In a manufacturing apparatus for a molten metal plated steel strip that controls the amount of plating on the surface of the steel strip by blowing gas from the wiping nozzle onto the surface of the steel strip that is continuously pulled up from the molten metal plating bath in the plating tank. A shielding plate covering at least 30% of the plating bath surface on the front surface of the steel strip lifting portion on the plating tank wall side on the front surface of the steel strip lifting portion; and at least steel on the snout side of the plating bath surface sandwiched between the steel belt lifting portion and the snout. An apparatus for producing a molten metal-plated steel strip, characterized in that a shielding plate that covers 30% or more of the plating bath surface sandwiched between the strip lifting portion and the snout is provided at a distance from the plating bath surface.
［２］前記遮蔽板の少なくとも一方は、鋼帯面と直角方向に移動可能であることを特徴とする［１］に記載の溶融金属めっき鋼帯製造装置。 [2] The molten metal plated steel strip manufacturing apparatus according to [1], wherein at least one of the shielding plates is movable in a direction perpendicular to the steel strip surface.
［３］前記遮蔽板の少なくとも一方は、鋼帯面と直角方向の一方の端部側を支点として、他方の端部を上方に回動可能であることを特徴とする［１］又は［２］に記載の溶融金属めっき鋼帯製造装置。 [3] At least one of the shielding plates is capable of turning the other end upward with one end in a direction perpendicular to the steel strip surface as a fulcrum [1] or [2 ] The apparatus for manufacturing a molten metal-plated steel strip according to claim 1.
［４］前記遮蔽板のめっき浴面側の面は、熱反射率が７０％以上であることを特徴とする［１］〜［３］のいずれかに記載の溶融金属めっき鋼帯製造装置。 [4] The molten metal plated steel strip manufacturing apparatus according to any one of [1] to [3], wherein the surface on the plating bath surface side of the shielding plate has a heat reflectance of 70% or more.
［５］前記遮蔽板のめっき浴面側の面は、鋼帯から遠ざかると浴面との距離が大きくなることを特徴とする［１］〜［４］のいずれかに記載の溶融金属めっき鋼帯製造装置。 [5] The molten metal-plated steel according to any one of [1] to [4], wherein the surface on the plating bath surface side of the shielding plate has a greater distance from the bath surface as the distance from the steel strip increases. Band manufacturing equipment.
［６］前記遮蔽板は、鋼帯側端部に金属粉落下防止板が設けられていること特徴とする［１］〜［５］のいずれかに記載の溶融金属めっき鋼帯製造装置。 [6] The molten metal plated steel strip manufacturing apparatus according to any one of [1] to [5], wherein the shielding plate is provided with a metal powder fall prevention plate at an end portion on the steel strip side.
［７］ ［１］〜［６］のいずれかに記載の溶融金属めっき鋼帯製造装置を用いることを特徴とする溶融金属めっき鋼帯の製造方法。 [7] A method for producing a molten metal plated steel strip, comprising using the apparatus for producing a molten metal plated steel strip according to any one of [1] to [6].
本発明によれば、めっき浴を覆う遮蔽板をめっき浴と間隔をあけて設置し、トップドロスの温度をめっき浴温程度になるように保熱することで、通常通板速度においても、通板速度を上昇した場合も、トップドロス中の気泡を抜き、トップドロスの体積を低減できることから、トップドロス除去作業の負荷を軽減でき、また酸化金属とめっき金属の分離を促進してめっき金属の持ち出しを抑制することでめっき金属歩留まりの低下を抑制できる。また、トップドロスの発生量を低減できることで溶融金属めっき鋼帯のトップドロスに起因する欠陥の発生を低減できる効果もある。また、本発明には、特許文献１のようなメンテナンス面の問題もない。 According to the present invention, a shielding plate covering the plating bath is installed at a distance from the plating bath, and the top dross is kept at a temperature approximately equal to the temperature of the plating bath, so that even at a normal plate passing speed, Even when the plate speed is increased, bubbles in the top dross can be removed and the volume of the top dross can be reduced, reducing the load of top dross removal work, and promoting the separation of the metal oxide and plating metal, By suppressing the carry-out, it is possible to suppress the decrease in the yield of plated metal. Moreover, since the amount of generation | occurrence | production of top dross can be reduced, there also exists an effect which can reduce generation | occurrence | production of the defect resulting from the top dross of a hot-dip metal plating steel strip. Further, the present invention does not have a maintenance problem as in Patent Document 1.
以下、図面を参照して本発明の実施の形態を説明する。 Embodiments of the present invention will be described below with reference to the drawings.
図１は本発明の溶融金属めっき鋼帯製造装置の一実施形態を示す概略斜視図である。図１において、１は鋼帯、２はスナウト、３はめっき槽、６はワイピングノズル、１１、１２は遮蔽板である。なお、本明細書において、鋼帯引き上げ部後面、鋼帯引き上げ部前面は、各々、図１において、鋼帯引き上げ部の左側（スナウト側）、鋼帯引き上げ部の右側（反スナウト側）を指している。 FIG. 1 is a schematic perspective view showing an embodiment of the apparatus for producing a molten metal plated steel strip of the present invention. In FIG. 1, 1 is a steel strip, 2 is a snout, 3 is a plating tank, 6 is a wiping nozzle, and 11 and 12 are shielding plates. In addition, in this specification, the steel band lifting part rear surface and the steel band lifting part front surface respectively refer to the left side (snout side) of the steel band lifting part and the right side (anti-snout side) of the steel band lifting part in FIG. ing.
遮蔽板１１は鋼帯引き上げ部前面に、遮蔽板１２は鋼帯引き上げ部とスナウト間に配置され、またいずれも鉛直方向位置がワイピングノズル６より低く、めっき浴面と間隔をあけ、めっき浴面を覆うように配置されている。遮蔽板１１、１２は、鋼帯幅方向の幅は最大鋼帯幅以上の幅を有することが好ましく、めっき浴の鋼帯幅方向全幅を覆う幅を有することがより好ましい。 The shielding plate 11 is disposed in front of the steel strip lifting portion, and the shielding plate 12 is disposed between the steel strip lifting portion and the snout. In both cases, the vertical position is lower than that of the wiping nozzle 6 and is spaced from the plating bath surface. It is arranged to cover. The shielding plates 11 and 12 preferably have a width in the steel strip width direction equal to or greater than the maximum steel strip width, and more preferably have a width that covers the entire width of the plating bath in the steel strip width direction.
図２は図１の溶融金属めっき鋼帯製造装置の遮蔽板１１の一実施形態を示す側面図である。遮蔽板１１は、鋼帯幅方向の幅は最大鋼帯幅以上の幅を有し、鋼帯引き上げ部前面の溶融金属めっき浴面を覆う板状構造物２１を備える。該板状構造物２１は、鋼帯厚み方向の寸法が前記板状構造物と同程度の寸法で、鋼帯幅方向寸法がめっき槽幅より広幅のフレーム２４の上部に固定され、前記フレーム２４の鋼帯幅方向の両側の下部に取り付けられた車輪取り付け部材２５に可動用車輪２２が取り付けされている。可動用車輪２２はめっき槽外の床面上を鋼帯厚み方向に移動可能で、遮蔽板１１をめっき浴を覆わない位置まで移動可能である。遮蔽板１１が所定の位置を移動できるように、ガイドレール等を設置してもかまわない。板状構造物２１の鋼帯側端部に上端を該板状構造物２１上に突出させて取り付けた金属粉落下防止板２３を備える。鋼帯方向に移動したときに、遮蔽板１１が鋼帯１に当たらないように、車輪止めを設置しておく必要がある。 FIG. 2 is a side view showing an embodiment of the shielding plate 11 of the molten metal plated steel strip manufacturing apparatus of FIG. The shielding plate 11 includes a plate-like structure 21 having a width in the steel strip width direction equal to or greater than the maximum steel strip width and covering the molten metal plating bath surface in front of the steel strip lifting portion. The plate-like structure 21 is fixed to the upper part of a frame 24 whose dimension in the steel strip thickness direction is the same as that of the plate-like structure and whose width in the steel strip width direction is wider than the plating tank width. The movable wheel 22 is attached to a wheel attachment member 25 attached to the lower part on both sides in the steel strip width direction. The movable wheel 22 can move on the floor surface outside the plating tank in the thickness direction of the steel strip, and can move the shielding plate 11 to a position where the plating bath is not covered. A guide rail or the like may be installed so that the shielding plate 11 can move in a predetermined position. A metal powder fall prevention plate 23 attached to the end of the plate-like structure 21 with the upper end protruding on the plate-like structure 21 is provided. It is necessary to install a wheel stopper so that the shielding plate 11 does not hit the steel strip 1 when moving in the steel strip direction.
図３は図１の溶融金属めっき鋼帯製造装置の遮蔽板１２の一実施形態を示す側面図である。遮蔽板１２は、鋼帯幅方向の幅は最大鋼帯幅以上の幅を有し、鋼帯引き上げ部後面の溶融金属めっき浴面を覆う板状構造物３１を備える。該板状構造物３１は、スナウト側端部が、鋼帯幅方向寸法がめっき槽幅より広幅のフレーム３４の上部に蝶番３２を介して取り付けられている。前記フレーム３４の鋼帯幅方向の両側の下部の４箇所に該フレーム３４をめっき槽外の床面上に載置する脚部３５が取り付けられている。板状構造物３１の鋼帯側端部に上端を該板状構造物３１上に突出させて取り付けた金属粉落下防止板３３を備える。なお、蝶番３２による板状構造物３１の上方への回転は、板状構造物３１がスナウト２に接触する程度まで回転できるようにしてもよい。 FIG. 3 is a side view showing an embodiment of the shielding plate 12 of the apparatus for manufacturing a molten metal plated steel strip of FIG. The shielding plate 12 includes a plate-like structure 31 that has a width in the steel strip width direction equal to or greater than the maximum steel strip width and covers the molten metal plating bath surface on the rear surface of the steel strip lifting portion. The plate-like structure 31 has a snout side end attached to an upper portion of a frame 34 having a steel strip width direction dimension wider than the plating tank width via a hinge 32. Leg portions 35 for mounting the frame 34 on the floor surface outside the plating tank are attached to the lower portion of both sides of the frame 34 in the width direction of the steel strip. A metal powder fall prevention plate 33 is provided at the steel strip side end portion of the plate-like structure 31 with the upper end protruding on the plate-like structure 31. Note that the upward rotation of the plate-like structure 31 by the hinge 32 may be rotated to the extent that the plate-like structure 31 comes into contact with the snout 2.
ガスワイピング方式で溶融金属めっき鋼帯を製造すると、生成したトップドロスは、図４の矢印の領域、すなわち、鋼帯引き上げ部前面のめっき槽壁側の浴面、及び、鋼帯引き上げ部とスナウトに挟まれるめっき浴面のスナウト側の浴面に溜まる。そのため、遮蔽板は、前記した図４の矢印の領域を覆うように配置する。図４の矢印の領域を覆うように遮蔽板を配置すると、気泡を多く含んだトップドロスは、最表面温度がめっき浴温程度になるように保熱できることから、浴上に溜まっている間に十分に脱気され、同時に酸化金属とめっき金属との分離も進む。生成したトップドロスが図４の矢印の領域に溜まらないと、本発明で意図する作用効果が奏されない。そのため、本発明では、遮蔽板をめっき浴面と間隔をあけて設ける。遮蔽板は、トップドロスと接触しないように配置することが好ましい。 When a hot-dip metal-plated steel strip is manufactured by the gas wiping method, the generated top dross includes the region indicated by the arrow in FIG. 4, that is, the bath surface on the plating tank wall side in front of the steel strip lifting portion, and the steel strip lifting portion and the snout. It accumulates on the bath surface on the snout side of the plating bath surface sandwiched between. Therefore, the shielding plate is disposed so as to cover the area of the arrow in FIG. When the shielding plate is arranged so as to cover the area of the arrow in FIG. 4, the top dross containing a large amount of air bubbles can be kept so that the outermost surface temperature is about the temperature of the plating bath. It is sufficiently deaerated, and at the same time, the separation of the metal oxide and the plated metal proceeds. If the generated top dross does not accumulate in the area of the arrow in FIG. 4, the intended effect of the present invention is not achieved. Therefore, in this invention, a shielding board is provided at intervals with a plating bath surface. The shielding plate is preferably arranged so as not to contact the top dross.
脱気およびめっき金属との分離が進んだトップドロスを回収する際は、遮蔽板１１を、めっき浴面を覆わない位置に移動させて浴面からトップドロスを掬い出せばよい、また遮蔽板１２の板状構造物３１を蝶番３２で回転させてめっき浴面を覆わないようにした後、浴面からトップドロスを掬い出せばよい。 When recovering the top dross that has been deaerated and separated from the plating metal, the shielding plate 11 may be moved to a position that does not cover the plating bath surface, and the top dross may be scooped out from the bath surface. After rotating the plate-like structure 31 with a hinge 32 so as not to cover the plating bath surface, the top dross may be scooped out from the bath surface.
トップドロスを脱気することで、通常通板速度においても、高速通板時においても、トップドロスの体積を低減できる。トップドロスの体積を低減することで、トップドロス除去作業の負荷を軽減でき、まためっき金属との分離も進むことからめっき金属の歩留まりの低下を抑制できる。また、トップドロスの発生量を低減できることによって、溶融金属めっき鋼帯のトップドロスに起因する欠陥の発生を低減できる。 By degassing the top dross, the volume of the top dross can be reduced at both the normal plate passing speed and the high plate passing speed. By reducing the volume of the top dross, it is possible to reduce the load of the top dross removal work, and the separation from the plating metal proceeds, so that it is possible to suppress a decrease in the yield of the plating metal. Moreover, generation | occurrence | production of the defect resulting from the top dross of a hot-dip metal plating steel strip can be reduced by being able to reduce the generation amount of a top dross.
トップドロスはめっき浴面の前記した領域に溜まるので、遮蔽板は、めっき浴面の全てを覆う必要はない。連続溶融亜鉛めっき鋼板製造ラインにおいて、製造条件（板サイズ、ライン速度、ガスワイピング設定）を一定とし、浴面に浮いているトップドロスを除去した後、めっき浴面遮蔽率を変化させた本発明の遮蔽板を配置して２時間後のトップドロス発生量を比較した結果を図５に示す。遮蔽位置は、鋼帯引き上げ部前面のめっき槽壁側、鋼帯引き上げ部とスナウトに挟まれるめっき浴面のスナウト側（図４の矢印部分）から遮蔽するようにした。トップドロス発生量は、２時間後に生成していたトップドロスを汲み上げ、遮蔽板を配置しなかった場合の汲み上げ量（汲み上げ体積）を１００とした場合の比率で示している。図５に示すとおり、被覆率が３０％未満になるとトップドロス発生量を抑制する効果が低下することがわかった。そのため、本発明では遮蔽板のめっき浴面の被覆率を３０％以上とした。トップドロス発生量を抑制する点からは、被覆率は高い方が好ましいが、高すぎると遮蔽板が鋼帯に近づくことになり、エッジスプラッシュが遮蔽板上に堆積しやすくなって遮蔽板清掃頻度が高くなる。したがって、遮蔽率は９０％以下が好ましい。 Since the top dross accumulates in the aforementioned region of the plating bath surface, the shielding plate does not need to cover the entire plating bath surface. In the continuous hot-dip galvanized steel sheet manufacturing line, the manufacturing conditions (plate size, line speed, gas wiping settings) are made constant, the top dross floating on the bath surface is removed, and the plating bath surface shielding rate is changed FIG. 5 shows the result of comparison of the amount of generated top dross after 2 hours with the shielding plate. The shield position was shielded from the plating tank wall side on the front surface of the steel strip lifting portion, and from the snout side (arrow portion in FIG. 4) of the plating bath surface sandwiched between the steel strip lifting portion and the snout. The top dross generation amount is shown as a ratio when the top dross generated after 2 hours is pumped and the pumping amount (pumping volume) when the shielding plate is not arranged is 100. As shown in FIG. 5, it was found that when the coverage ratio was less than 30%, the effect of suppressing the amount of top dross generated decreased. Therefore, in this invention, the coverage of the plating bath surface of a shielding board was 30% or more. From the standpoint of reducing the amount of top dross generated, a higher coverage is preferable, but if it is too high, the shielding plate will approach the steel strip, and edge splash will easily accumulate on the shielding plate, and the shielding plate will be cleaned frequently. Becomes higher. Therefore, the shielding rate is preferably 90% or less.
遮蔽板１１、１２は各々金属粉落下防止板２３、３３を備えることで、遮蔽板上に堆積した金属粉が鋼帯側に飛散するのを防止することができる。金属粉落下防止板２３、３３と遮蔽板１１、１２とのなす角度は、直角または鈍角であると鋼帯側に再飛散する恐れがあるため、鋭角であることが好ましく、金属粉落下防止板の突出高さはその目的から５０〜２００ｍｍの範囲内であることが好ましい。 The shielding plates 11 and 12 include the metal powder fall prevention plates 23 and 33, respectively, so that the metal powder deposited on the shielding plate can be prevented from scattering to the steel strip side. The angle formed between the metal powder fall prevention plates 23 and 33 and the shielding plates 11 and 12 is preferably an acute angle because there is a risk of re-scattering to the steel strip side when the angle is a right angle or an obtuse angle. The protrusion height is preferably in the range of 50 to 200 mm for the purpose.
遮蔽板の浴面側の面（下面）は、鋼帯から遠ざかると浴面との距離が大きくなるようにすることが好ましい。遮蔽板の浴面側の面の形状は特に限定されない。遮蔽板の浴面側の面と浴面との距離は、図６（ａ）に示すように鋼帯から遠ざかると浴面との距離が直線状に増加してもよいし、図６（ｂ）に示すように非直線状に増加してもよい。これによって、浴面の熱をトップドロスが溜まりやすい箇所に選択的に反射させ、保熱効果をより向上させることができる。遮蔽板はトップドロスと接触しない位置に配置することが好ましい。 It is preferable that the surface (lower surface) on the bath surface side of the shielding plate is such that the distance from the bath surface increases as the distance from the steel strip increases. The shape of the surface on the bath surface side of the shielding plate is not particularly limited. As shown in FIG. 6 (a), the distance between the surface of the shielding plate on the bath surface side and the bath surface may increase linearly as the distance from the bath surface increases as the distance from the steel strip increases. ) As shown in FIG. As a result, the heat of the bath surface can be selectively reflected to the location where the top dross tends to accumulate, and the heat retention effect can be further improved. The shielding plate is preferably arranged at a position where it does not contact the top dross.
遮蔽板１１、１２の保温性を増すために、遮蔽板１１、１２の浴面側の面（下面）は、高熱反射の表面になるようにするのがよい。具体的な手法には高熱反射塗料の塗布、機械的な鏡面加工等が挙げられるが、いずれの手法でもよく、それ以外の手法でも構わない。図７はオフラインの小型溶融亜鉛浴に遮蔽板を設置し、その下面の熱反射率を変化させた場合のトップドロス表面温度の測定結果である。浴温設定（浴表面から２００ｍｍ深さ）４６０℃に対して、熱反射率が７０％以上であれば、トップドロス表面がほぼ浴温に近い温度（２℃以内）となることがわかった。したがって保温性を維持するためには、遮蔽板の浴面側の面の熱反射率は７０％以上であることが望ましい。遮蔽板の浴面側の面は金属ヒュームによって「曇る」ので、遮蔽板の浴面側の面の熱反射率を定期的に確認し、曇りが顕著であるときは遮蔽板を交換しながら操業するのが望ましい。なお、反射率は次のようにして求めた。遮蔽板の下面の温度を、遮蔽板の下面に取り付けた熱電対と輻射温度計とで測定し、輻射温度計の放射率を調整して熱電対の温度と同じ温度になる放射率ε０を求め、下式から、遮蔽板の浴面側の面の熱反射率γ（％）を求めた。
γ＝（１−ε０）×１００（％）
本発明では、トップドロスの発生をゼロにはできないが、特許文献１や２のように浴面から浴中にトップドロスを回収するための構造物を設置する必要がなく、少量発生したトップドロスは従来通りに手動および自動回収装置等で回収することが可能である。
In order to increase the heat retaining properties of the shielding plates 11 and 12, the surface (lower surface) on the bath surface side of the shielding plates 11 and 12 is preferably a highly heat reflective surface. Specific methods include application of a highly heat-reflective coating, mechanical mirror finishing, etc., but any method may be used, and other methods may be used. FIG. 7 shows the measurement results of the top dross surface temperature when a shielding plate is installed in an off-line small molten zinc bath and the heat reflectance of the lower surface is changed. It was found that when the heat reflectance is 70% or higher with respect to the bath temperature setting (depth of 200 mm from the bath surface) of 460 ° C., the top dross surface is close to the bath temperature (within 2 ° C.). Therefore, in order to maintain heat retention, it is desirable that the heat reflectance of the surface of the shielding plate on the bath surface side is 70% or more. The surface on the bathing surface side of the shielding plate is “clouded” by metal fume, so check the heat reflectance of the surface on the bathing surface side of the shielding plate regularly, and if fogging is noticeable, operate while replacing the shielding plate. It is desirable to do. The reflectance was determined as follows. Measure the temperature of the lower surface of the shielding plate with a thermocouple and radiation thermometer attached to the lower surface of the shielding plate, and adjust the emissivity of the radiation thermometer to obtain the emissivity ε0 at the same temperature as the thermocouple temperature. From the following formula, the heat reflectance γ (%) of the surface of the shielding plate on the bath surface side was determined.
γ = (1−ε0) × 100 (%)
In the present invention, the generation of top dross cannot be reduced to zero, but there is no need to install a structure for collecting the top dross from the bath surface into the bath as in Patent Documents 1 and 2, and a small amount of top dross is generated. Can be recovered manually and automatically with an automatic recovery device.
以下の溶融亜鉛めっき鋼帯の製造試験を行った。溶融亜鉛めっき鋼帯の製造条件は、ワイピングノズルのスリットギャップ０．９ｍｍ、ワイピングノズル−鋼帯間距離８ｍｍ、溶融亜鉛浴からのワイピングノズル高さ４５０ｍｍ、溶融亜鉛浴温度４６０℃とし、鋼帯サイズは、０．８ｍｍ厚×１．２ｍ幅、めっき付着量は片面５０ｇ／ｍ２とした。 The following hot-dip galvanized steel strip production test was conducted. The production conditions of the hot dip galvanized steel strip are as follows: slit width of the wiping nozzle is 0.9 mm, distance between the wiping nozzle and the steel strip is 8 mm, height of the wiping nozzle from the hot dip zinc bath is 450 mm, hot dip zinc bath temperature is 460 ° C. Was 0.8 mm thickness x 1.2 m width, and the amount of plating was 50 g / m 2 on one side.
本発明例は、遮蔽板は、板幅方向２．５ｍ×板厚方向０．５ｍの大きさで、市販のアルミ製フレームで形成された枠に、２ｍｍ厚のアルミ板を貼り付けたものとし、各角に設けた脚部の先端にはキャスターをつけて手動にて移動可能な構造とした。前記アルミ板の鋼帯側端部にアルミ板より上に突出させて高さ１００ｍｍ、厚さ３．２ｍｍの金属粉落下防止板（鋼帯）をアルミ板との角度が７０度となるように取り付けた。めっき槽の縁には突起を設けており、遮蔽板はポット内に転落することも、鋼帯に衝突することもないようにしてある。遮蔽板の浴面側の面は高熱反射塗料が塗布されており、初期状態での熱反射率は８０％であった。鋼帯引き上げ部とスナウトに挟まれるめっき浴面はスナウトから遮蔽板で覆い、スナウトから鋼帯引き上げ部までのめっき浴面の５０％を覆うようにした。鋼帯引き上げ部前面のめっき浴面は、めっき槽壁部から遮蔽板で覆い、鋼帯引き上げ部前面のめっき浴面の５０％を覆うようにした。遮蔽板と浴面との距離は３００ｍｍとした。 In the example of the present invention, the shielding plate has a size of 2.5 m in the plate width direction and 0.5 m in the plate thickness direction, and a 2 mm thick aluminum plate is attached to a frame formed of a commercially available aluminum frame. In addition, a caster is attached to the tip of each leg provided at each corner so that it can be moved manually. A metal powder fall prevention plate (steel strip) having a height of 100 mm and a thickness of 3.2 mm is projected on the steel strip side end of the aluminum plate so that the angle with the aluminum plate is 70 degrees. Attached. Protrusions are provided on the edges of the plating tank so that the shielding plate does not fall into the pot or collide with the steel strip. The surface on the bath surface side of the shielding plate was coated with a high heat reflective paint, and the heat reflectivity in the initial state was 80%. The plating bath surface sandwiched between the steel strip lifting portion and the snout was covered with a shielding plate from the snout, and 50% of the plating bath surface from the snout to the steel strip lifting portion was covered. The plating bath surface on the front side of the steel strip lifting part was covered with a shielding plate from the plating tank wall so as to cover 50% of the plating bath surface on the front side of the steel strip lifting part. The distance between the shielding plate and the bath surface was 300 mm.
その他の製造条件および製品品質の指標となるトップドロス発生量の調査結果を表１に示す。トップドロス発生量は、トップドロスを１辺５０ｃｍ、深さ５０ｃｍの角型回収箱に回収し、その回収箱数をポット通過鋼帯表面積１００ｋｍ２当たりの数字で示した数値である。 Table 1 shows the results of the investigation of the amount of top dross generated as an index of other manufacturing conditions and product quality. The amount of generated top dross is a numerical value obtained by collecting the top dross in a rectangular collection box having a side of 50 cm and a depth of 50 cm, and the number of collection boxes is represented by a number per 100 km 2 of the surface area of the steel strip passing through the pot.
通板速度２．２ｍ／ｓの条件では、遮蔽板を使用しない通常操業の比較例１はトップドロス発生量（亜鉛浴通過鋼帯表面積１００ｋｍ２当たり）が２．９箱であったのに対し、本発明例１は１．８箱でおよそ３８％減少した。通板速度を３．０ｍ／ｓに上昇した条件では、遮蔽板を使用しない比較例２は、比較例１と比べて、通板速度は１．３６倍であるのに対して、トップドロス発生量は５．４箱で１．８５倍に増加した。この発生量では、トップドロスを汲み出すために工場オペレーターが常時２名で作業しなければならず、表面欠陥の増加だけでなく、オペレーター人数の増加によるコストアップの問題がある。一方、本発明例２はトップドロス発生量が２．８箱となり、比較例２より４８％減少し、比較例１とほぼ同量の回収量に留まっており、通板速度を上昇しても十分な効果が確認できた。 In the condition of the plate passing speed of 2.2 m / s, the comparative example 1 of the normal operation without using the shielding plate had a top dross generation amount (per 100 km 2 of the zinc bath passage steel strip surface area) of 2.9 boxes. Inventive Example 1 was reduced by about 38% in 1.8 boxes. Under the condition that the sheet passing speed was increased to 3.0 m / s, the comparative example 2 in which the shielding plate is not used is 1.36 times faster than the comparative example 1, whereas the top dross is generated. The amount increased 1.85 times in 5.4 boxes. With this generated amount, the factory operator must always work with two people in order to pump out the top dross, which causes not only an increase in surface defects but also a cost increase due to an increase in the number of operators. On the other hand, in Example 2 of the present invention, the amount of top dross generated was 2.8 boxes, which was 48% lower than that in Comparative Example 2, and remained almost the same as in Comparative Example 1, and even when the plate passing speed was increased. A sufficient effect was confirmed.
本発明によれば、通常通板速度においても、また通板速度を上昇しても、トップドロスの発生量を低減し、また、トップドロス排出によるめっき金属の持ち出し量を減少し、表面欠陥の無いめっき鋼帯を高い生産性を維持したまま安定製造することが可能となる。 According to the present invention, the amount of top dross generated is reduced at both the normal plate feed speed and the plate feed speed, and the amount of plated metal taken out by top dross discharge is reduced. It is possible to stably produce a plated steel strip without maintaining high productivity.
１ 鋼帯
２ スナウト
３ めっき槽
４ 溶融金属めっき浴（めっき浴）
５ シンクロール
６ ワイピングノズル
７ サポートロール
８ サポートロール
１１、１２、１３ 遮蔽板
２１、３１ 板状構造物
２２ 可動用車輪
２３、３３ 金属粉落下防止板
２４、３４ フレーム
２５ 車輪取り付け部材
３２ 蝶番
３５ 脚部
1 Steel strip 2 Snout 3 Plating tank 4 Molten metal plating bath (plating bath)
DESCRIPTION OF SYMBOLS 5 Sink roll 6 Wiping nozzle 7 Support roll 8 Support roll 11, 12, 13 Shield plate 21, 31 Plate-like structure 22 Wheel 23, 33 Metal powder fall prevention plates 24, 34 Frame 25 Wheel attachment member 32 Hinge 35 Leg Part
Claims (7)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114560223A (en) * | 2022-01-24 | 2022-05-31 | 中铁上海工程局集团有限公司 | Non-stop slag discharge soil bucket and use method thereof |
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| JPS5482335A (en) * | 1977-12-14 | 1979-06-30 | Nisshin Steel Co Ltd | Molten metal plating apparatus for steel belt and method of using same |
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