WO2013133205A1 - 溶融亜鉛ポットへのZn-Al合金供給方法、溶融亜鉛浴中Al濃度の調整方法及び、溶融亜鉛ポットへのZn-Al合金供給装置 - Google Patents
溶融亜鉛ポットへのZn-Al合金供給方法、溶融亜鉛浴中Al濃度の調整方法及び、溶融亜鉛ポットへのZn-Al合金供給装置 Download PDFInfo
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- WO2013133205A1 WO2013133205A1 PCT/JP2013/055821 JP2013055821W WO2013133205A1 WO 2013133205 A1 WO2013133205 A1 WO 2013133205A1 JP 2013055821 W JP2013055821 W JP 2013055821W WO 2013133205 A1 WO2013133205 A1 WO 2013133205A1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
- B05C3/02—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material
- B05C3/04—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material with special provision for agitating the work or the liquid or other fluent material
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
- C23C2/0034—Details related to elements immersed in bath
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
- C23C2/0034—Details related to elements immersed in bath
- C23C2/00342—Moving elements, e.g. pumps or mixers
- C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/50—Controlling or regulating the coating processes
- C23C2/52—Controlling or regulating the coating processes with means for measuring or sensing
- C23C2/521—Composition of the bath
Definitions
- the present invention relates to a method for supplying Zn—Al alloy to a hot dip zinc pot in a continuous hot dip galvanizing line for steel sheets, a method for adjusting the Al concentration in the hot dip zinc bath, and a device for supplying Zn—Al alloy to the hot dip zinc pot.
- the concentration of Al in the hot dip galvanizing bath in the hot dip galvanizing pot placed in the continuous hot dip galvanizing line of steel plates (weight% of Al with respect to the total hot dip galvanizing bath) It affects the quality of the alloy layer. Therefore, in order to stabilize the quality of the galvanized steel sheet, it is important to keep the Al concentration in the molten zinc bath constant.
- a zinc ingot containing Al is introduced into the molten zinc pot from above the molten zinc pot, so that the molten zinc in the molten zinc bath While keeping the amount constant, the Al concentration in the molten zinc was roughly adjusted (Patent Document 1).
- ICP analysis is carried out by pumping up a part of the molten zinc in the molten zinc pot, and the Al concentration in the molten zinc bath is measured by an Al concentration meter installed in the molten zinc pot.
- a Zn-Al alloy piece (so-called aluminum cake) having a higher concentration of Al than the zinc ingot containing Al is manually put into the surface layer of the molten zinc bath from above the molten zinc pot.
- a method of finely adjusting the Al concentration in the molten zinc has been adopted.
- the zinc ingot has a weight of several tens to several hundred kg
- the fine adjustment Zn—Al alloy piece (aluminum cake) has a weight of about 5 to 10 kg.
- Al in the zinc ingot containing Al and in the Zn-Al alloy piece has a specific gravity smaller than that of zinc. Therefore, when a zinc ingot containing Al or a Zn—Al alloy piece is charged by the method described above, Al is concentrated on the bath surface of the molten zinc bath, and the vicinity of the bath surface is in a high Al concentration state. On the other hand, the bottom of the molten zinc pot is in a low Al concentration state, and bottom dross is likely to be generated and deposited at the bottom. The bottom dross is wound up by the stirring flow in the pot and adheres to the steel sheet when the plate passing speed of the continuous galvanizing line becomes high.
- the present invention aims to solve the above-mentioned conventional problems. That is, the present invention always keeps the Al concentration in the hot dip zinc bath in the hot dip galvanizing line of the continuous hot dip galvanizing line of steel sheets, and even if high-speed threading is performed than before, pressing, insufficient alloying, It is an object to provide a method for supplying Zn-Al alloy to a molten zinc pot without generating an overalloy, a method for adjusting the Al concentration in the molten zinc bath, and a device for supplying Zn-Al alloy to the molten zinc pot. To do.
- the Zn—Al alloy supply method to the hot dip galvanizing pot is a method of supplying the Zn—Al alloy to the hot dip zinc pot containing the hot dip zinc bath in the hot dip galvanizing line.
- the inside of the insertion guide is pressurized with an inert gas The molten zinc bath is prevented from entering the insertion guide.
- the Zn—Al alloy may be in any one of a wire shape, a chip shape, and a powder shape.
- the supply portion of the insertion guide is between the front support roll in the molten zinc bath and the traveling steel plate. It may be installed in the generated discharge flow.
- the method for adjusting the Al concentration in the molten zinc bath according to one aspect of the present invention is supplied by the Zn—Al alloy supplying method to the molten zinc pot according to any one of (1) to (3) above. And a control step of controlling the supply amount of the Zn—Al alloy according to the Al concentration measured by an Al concentration meter installed in the molten zinc pot.
- a Zn—Al alloy supply device to a hot dip zinc pot includes a Zn—Al alloy in a hot dip zinc pot containing a hot dip zinc bath in which a front support roll in a hot dip galvanizing line is immersed. Is provided between the inner wall on the downstream side in the traveling direction of the steel sheet of the molten zinc pot and the front support roll installed in the molten zinc bath.
- the Zn—Al alloy is supplied into the molten zinc bath from the supply part of the insertion guide.
- Al is uniformly diffused in the molten zinc bath by supplying Zn-Al alloy into the molten zinc pot from the supply section provided at the bottom of the pipe-shaped insertion guide, which is immersed within a depth of ⁇ 400 mm from Can be made.
- the amount of Zn—Al alloy to be supplied is controlled according to the Al concentration in the molten zinc bath measured by the Al concentration meter, so that the alloy of the iron and zinc is controlled.
- the Al concentration in the molten zinc bath including the surface of the steel plate causing the reaction can always be kept constant. For this reason, the quality of the alloy layer is stabilized, and it is possible to prevent the occurrence of insufficient alloying and over-alloying called raw burning.
- FIG. 1 1 is a hot dip galvanizing pot in a hot dip galvanizing line for steel sheets
- 2 is a hot dip galvanizing bath accommodated therein.
- a sink roll 3 Inside the molten zinc pot 1, a sink roll 3, a front support roll 4, and a back support roll 5 are installed so as to be immersed in the molten zinc bath 2.
- the steel sheet S is introduced into the molten zinc bath 2 from an oblique direction, reversed by the sink roll 3, and pulled up vertically between the front support roll 4 and the back support rule 5 in the molten zinc bath. It is done.
- the right direction in FIG. 1 is called the upstream side in the traveling direction of the steel sheet
- the left direction in the drawing is called the downstream side in the traveling direction of the steel sheet.
- a Zn—Al alloy addition device (Zn—Al alloy supply device) 6 is provided above the liquid surface of the molten zinc pot 1. The details are as shown in FIG.
- a Zn—Al alloy wire 7 is wound around a drum 8, and the drum 8 is rotated by a motor 9, whereby the Zn—Al alloy wire 7 is drawn downward through guide rollers 10, 10 to form a pipe shape.
- the molten zinc bath 2 is supplied from a supply portion provided at the lower portion of the insertion guide 11. Considering the safety of the work of exchanging the Zn—Al alloy wire, it is preferable that the drum 8 is disposed above the work floor 19, not on the molten zinc bath surface.
- the supply of the Zn—Al alloy wire 7 is preferably continuous, but may be intermittent supply with a short cycle.
- the insertion guide 11 is made of a heat-resistant ceramic such as alumina, and is located between the inner wall 20 on the downstream side in the traveling direction of the steel sheet of the molten zinc pot and the front support roll installed in the molten zinc bath, that is, It is installed in the hot dip galvanizing bath on the left side of the paper than the front support roll. Furthermore, the above-mentioned supply part is set so that the depth may be within ⁇ 400 mm from the lower end of the front support roll 4 in the molten zinc bath.
- the entire addition device 6 is housed in an airtight seal box 12, and an inert gas such as nitrogen gas or Ar gas is supplied through a valve 13 from a gas supply device (not shown).
- a pressure gauge 14 detects the internal pressure of the hermetic seal box 12. This pressure gauge controls the pressure inside the insertion guide 11 by controlling the amount of inert gas supplied from the gas supply device through the valve 13. The supplied inert gas pushes down the molten zinc that is about to enter the inside of the insertion guide 11 to, for example, the vicinity of the lower end of the insertion guide 11.
- the Zn—Al alloy wire 7 descends to the lower end of the insertion guide 11 without coming into contact with the molten zinc, and begins to melt in contact with the molten zinc as soon as it exits from the lower end, that is, from the Zn—Al alloy. Feeding into the molten zinc bath is started.
- the position where the supply of the Zn—Al alloy into the molten zinc bath starts corresponds to the supply portion of the insertion guide. Note that it is not desirable to use air (atmosphere) instead of inert gas because molten zinc and Zn—Al alloy may be oxidized.
- a suitable number of Al concentration meters 15 are installed in the molten zinc pot 1.
- the supply amount of the Zn—Al alloy is controlled according to the Al concentration measured by the Al concentration meter 15.
- the supply amount of the Zn—Al alloy can be controlled, for example, by changing the feed speed of the wire 7. If the wire feed rate is increased, the wire may not be dissolved immediately even when it comes into contact with molten zinc. In such a case, the wire may be preheated.
- FIG. 3 is a view showing the flow of the molten zinc bath generated inside the molten zinc pot 1.
- the roll rotating flow B by the front support roll 4 and the accompanying flow A in the vicinity of the steel plate S collide, and a strong discharge flow C is generated toward the downstream side (left side of the paper) in the traveling direction of the steel plate.
- the discharge flow C collides with the wall surface and is separated into upper and lower parts, and circulates through the entire molten zinc pot 1.
- the Zn—Al alloy can be diffused efficiently and uniformly on the strong discharge flow C. It was.
- the discharge flow C is directed toward the downstream side in the steel plate traveling direction of the front support roll. Therefore, the present inventors considered that it is effective to install the insertion guide so that the supply portion of the insertion guide is on the downstream side in the steel plate traveling direction with respect to the front support roll. Then, in order to perform a more detailed study on the installation position of the insertion guide, the present inventors conducted a test using a 1/5 scale water model similar to the actual machine and the fluid number several times, Flow analysis was performed. For the flow analysis, an acrylic tracer having a particle size of 50 ⁇ m was used.
- the acrylic tracer was added from various depths, and the number of detected tracers was counted by the particle counters 16, 17 and 18 on the bath surface side and the bath bottom side.
- the positions of these particle counters 16, 17, 18 are shown in FIGS. 4A and 4B.
- the (tracer detection number on the bath surface side / tracer detection number on the bath bottom side) is the tracer detection ratio ⁇ , and the relationship between the distance from the lower end of the front support roll 4 to the acrylic tracer addition position and the tracer detection ratio ⁇
- the results are summarized in the graph of FIG.
- the distance from the front support roll of FIG. 5 is the value converted into the distance in an actual installation from the ratio of the magnitude
- FIG. 4A is a side view of the water tank used in the water model test.
- FIG. 4B is a plan view of the water tank.
- the particle counters 16, 17, and 18 are installed at different positions in the depth direction and the width direction of the steel plate.
- the tracer The detection ratio ⁇ was close to 1, that is, it was confirmed that the acrylic tracer was evenly dispersed on the bath surface side and the bath bottom side. Therefore, in the present invention, the Zn—Al alloy is supplied from the supply portion of the insertion guide 11 immersed at a depth within ⁇ 400 mm from the lower end of the front support roll 4. In order to disperse more evenly, the depth is preferably ⁇ 300 mm from the lower end of the front support roll 4, and more preferably ⁇ 200 mm.
- the addition position of the acrylic tracer was changed in the width direction of the steel sheet S, and the number of detected tracers was counted by a particle counter on the bath surface side and the bath bottom side at the same position in the width direction. Then, (the number of detected tracers on the bath surface side + the number of detected tracers on the bath bottom side) / the number of input tracers was defined as a tracer detection ratio ⁇ and summarized in the graph of FIG.
- the number of tracer detections on the bath surface side used when obtaining ⁇ is the result of measurement by the particle counter 16 of FIG. 4A, and the number of tracer detections on the bath bottom side is determined by the particle counter 18 of FIG. 4A.
- the steel plate width ratio on the horizontal axis of this graph is a value (L / W) obtained by dividing the distance L from the edge of the steel plate to the addition position of the acrylic tracer by the plate width W of the steel plate as shown in FIG.
- the steel sheet width ratio (L / W) is preferably 0 to 100%, more preferably 20 to 80%, and most preferably 40 to 60%.
- the contents of the present invention described above were confirmed by an actual machine.
- the molten zinc pot has a size of 3.1 m ⁇ 3.9 m ⁇ 2.6 m (depth), and the supply portion of the insertion guide is the same height (depth) as the lower end of the front support roll.
- -Al alloy was supplied.
- an Al concentration meter was installed at each of the X, Y, and Z positions shown in FIG. 8 in the molten zinc bath.
- X is in the vicinity of the inner wall surface on the upstream side in the traveling direction of the steel sheet and is 200 mm below the liquid surface (bath surface), and Y is also in the vicinity of the inner wall surface on the upstream side in the traveling direction of the steel sheet and 2000 mm below the liquid surface. Is the position. Z is the width direction outside of the front support roll, and the depth is the same as X.
- FIG. 9 shows the change in Al concentration at the X position.
- the vertical axis is a first Al concentration index expressed by Al concentration in the prior art / Al concentration in the method of the present invention.
- Al concentration greatly changed due to the loading of the aluminum cake.
- FIG. 10 shows a change in the ratio of the Al concentration at the Y position to the Al concentration at the X position (second Al concentration index) in the prior art and the method of the present invention.
- the value is always less than 1 and it can be seen that Al supply to the bath bottom is insufficient.
- the value was stable at about 1, and it was confirmed that the Al concentration difference between the bath surface and the bath bottom of the molten zinc bath could be eliminated.
- FIG. 11 shows a change in the ratio of the Al concentration at the Z position to the Al concentration at the X position (third Al concentration index).
- the Al concentration is remarkably increased by the introduction of the aluminum cake, and the Al concentration greatly fluctuates with the passage of time. That is, it can be seen that it takes a long time to stabilize the Al concentration.
- the value of the third Al concentration index is always stable, and the Al concentration can be stabilized over the entire molten zinc pot.
- FIG. 12 shows how the dross rolling-up rate changes depending on the sheet feed speed (line speed: LS).
- the dross rolling-up rate is a value obtained by indexing the dross floating number with the dross floating number at 100 m / min, which is a conventional sheet passing speed, being 100. This decrease in dross buoyancy indicates a decrease in dross accumulation.
- the dross rolling-up rate can be suppressed to 100%, and the sheet passing regulation speed can be increased by 30 m / min compared to the conventional case. As a result, productivity can be improved, and in the actual operation, the failure rate of alloying has been reduced to 1 ⁇ 2 of the conventional rate.
- the present invention is not limited to the above-described embodiment, and various design changes can be made without departing from the scope of the invention.
- the Zn—Al alloy is added in the form of a wire.
- the form of the Zn—Al alloy is not necessarily limited to the wire.
- a form can be adopted.
- a chip shape or a powder shape it may be supplied from a supply portion of a pipe-shaped insertion guide using a quantitative cutout device such as a granular material.
- the Zn—Al alloy is added.
- it dissolves in the molten zinc bath, it can be applied to other alloys such as a Zn—Al—Mg alloy.
- the Zn—Al alloy is supplied from the supply part provided at the lower part of the insertion guide, but the position of the supply part is not limited to the lower part of the insertion guide.
- the pressure of the inert gas is controlled so that the dissolution start position of the Zn—Al alloy is near the center of the insertion guide, and a hole is made in the side surface near the center of the insertion guide, and the Zn—Al The alloy may be fed into the molten zinc bath.
- the position (hole) into which the Zn—Al alloy is introduced may be at a position within ⁇ 400 mm from the lower end of the front support roll.
- a straight pipe-shaped guide is used as the insertion guide.
- the insertion guide may have a shape other than a straight shape, for example, a shape having a curvature. Good.
- Al can be uniformly dispersed in the molten zinc bath. Insufficient alloying due to non-uniformity, overalloying, etc. are not generated.
- Al can be uniformly diffused in the molten zinc bath. For this reason, generation
- heterogenous is suppressed, Even if it raises a plate-feeding speed, the pushing rod resulting from winding up of a bottom dross will reduce. For this reason, productivity can be improved.
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Abstract
Description
本願は、2012年03月05日に、日本に出願された特願2012-047546号に基づき優先権を主張し、その内容をここに援用する。
また、溶融亜鉛ポット内の溶融亜鉛の一部を汲み上げて実施するICP分析や、溶融亜鉛ポット内に設置したAl濃度計により溶融亜鉛浴中のAl濃度を測定し、溶融亜鉛浴中のAl濃度が低下してきたときには、Alを含有した亜鉛インゴットよりも含有Al濃度が高いZn-Al合金片(いわゆる、アルミケーキ)を人手により溶融亜鉛ポットの上方から溶融亜鉛浴の表層に投入することによって、溶融亜鉛中のAl濃度を微調整する方法が採用されていた。一般に、上記亜鉛インゴットは重量が数十~数百kgであり、微調整用のZn-Al合金片(アルミケーキ)は重量が5~10kg程度である。
(1)すなわち、本発明の一態様に係る溶融亜鉛ポットへのZn-Al合金供給方法は、溶融亜鉛めっきライン中の溶融亜鉛浴を収容する溶融亜鉛ポットにZn-Al合金を供給する方法であって、前記Zn-Al合金を、パイプ状の挿入ガイドの下部に設けられた供給部から供給する供給工程を有し;前記供給部は、前記溶融亜鉛ポットの、鋼板の進行方向における下流側の内壁と前記溶融亜鉛浴中に設置されたフロントサポートロールとの間でかつ、前記フロントサポートロールの下端から±400mm以内の深さに浸漬され、前記挿入ガイドの内部は不活性ガスによって加圧され、前記溶融亜鉛浴の前記挿入ガイドの前記内部への侵入が防止されている。
図1において、1は鋼板の溶融亜鉛めっきライン中の溶融亜鉛ポットであり、2はその内部に収容された溶融亜鉛浴である。溶融亜鉛ポット1の内部にはシンクロール3、フロントサポートロール4、バックサポートロール5が溶融亜鉛浴2に浸漬された状態で設置されている。鋼板Sは図1に示すように斜め方向から溶融亜鉛浴2中に導入され、シンクロール3で反転したうえ、溶融亜鉛浴中のフロントサポートロール4、バックサポートルール5の間から垂直上方に引き上げられる。本実施形態においては、図1の紙面右方向を鋼板の進行方向における上流側、紙面左方向を鋼板の進行方向における下流側と呼ぶ。
図3は溶融亜鉛ポット1の内部に生成される溶融亜鉛浴の流動を示す図である。溶融亜鉛浴2中では、フロントサポートロール4によるロール回転流Bと鋼板Sの近傍の随伴流Aとが衝突し、鋼板の進行方向における下流側(紙面左側)に向かう強い吐出流Cが発生する。吐出流Cは壁面に衝突して上下に分離し、溶融亜鉛ポット1の全体を循環する。本実施形態では、挿入ガイド11からZn-Al合金が供給される位置を吐出流C中とすることで、この強い吐出流Cに乗せてZn-Al合金を効率的にかつ均一に拡散させることとした。
ここで、εを求める際に用いた浴面側でのトレーサ検出数は、図4Aのパーティクルカウンタ16により測定した結果であり、浴底側でのトレーサ検出数は、図4Aのパーティクルカウンタ18により測定した結果である。
なお、図4Aは水モデル試験に用いた水槽の側面図である。図4Bは、水槽の平面図である。図4A、図4Bから分かるように、パーティクルカウンタ16、17、18は、深さ方向及び鋼板の幅方向において異なる位置に設置される。
このグラフの横軸の鋼板幅率は、図6に示すとおり鋼板のエッジからアクリルトレーサの添加位置までの距離Lを、鋼板の板幅Wで割った値(L/W)である。図7には鋼板の板幅の外側(鋼板幅率=110%)に設置したパーティクルカウンタによって検出されたトレーサ数を投入トレーサ数で割ったトレーサ検出比μも併せて表示した。なお、μを求める際に用いたパーティクルカウンタは、図4Aのパーティクルカウンタ17である。
Al濃度の測定のために、溶融亜鉛浴中の図8に示すX、Y、Z位置にそれぞれAl濃度計を設置した。Xは鋼板進行方向における上流側の内壁面の近傍で、液面(浴面)から200mm下の位置であり、Yは同じく鋼板進行方向における上流側の内壁面の近傍で、液面から2000mm下の位置である。Zはフロントサポートロールの幅方向外側で、深さはXと同一である。
2 溶融亜鉛浴
3 シンクロール
4 フロントサポートロール
5 バックサポートロール
6 添加装置(Zn-Al合金供給装置)
7 Zn-Al合金のワイヤ
8 ドラム
9 モータ
10 ガイドローラ
11 挿入ガイド
12 気密シールボックス
13 バルブ
14 圧力計
15 Al濃度計
16、17、18 パーティクルカウンタ
19 作業床
20 内壁
21 供給部
Claims (5)
- 溶融亜鉛めっきライン中の溶融亜鉛浴を収容する溶融亜鉛ポットにZn-Al合金を供給する方法であって、
前記Zn-Al合金を、パイプ状の挿入ガイドの下部に設けられた供給部から供給する供給工程を有し;
前記供給部は、前記溶融亜鉛ポットの、鋼板の進行方向における下流側の内壁と前記溶融亜鉛浴中に設置されたフロントサポートロールとの間でかつ、前記フロントサポートロールの下端から±400mm以内の深さに浸漬され;
前記挿入ガイドの内部は不活性ガスによって加圧され、前記溶融亜鉛浴の前記挿入ガイドの前記内部への侵入が防止されている
ことを特徴とする溶融亜鉛ポットへのZn-Al合金供給方法。 - 前記Zn-Al合金が、ワイヤ状、チップ状、パウダー状の何れか一つの形態であることを特徴とする請求項1に記載の溶融亜鉛ポットへのZn-Al合金供給方法。
- 前記挿入ガイドの前記供給部が、前記溶融亜鉛浴中の前記フロントサポートロールと走行する前記鋼板との間で発生する吐出流中に設置されていることを特徴とする請求項1に記載の溶融亜鉛ポットへのZn-Al合金供給方法。
- 請求項1~3のいずれか一項に記載の溶融亜鉛ポットへのZn-Al合金供給方法によって供給される前記Zn-Al合金の供給量を、前記溶融亜鉛ポット内に設置したAl濃度計により測定されたAl濃度に応じて制御する制御工程を有することを特徴とする溶融亜鉛浴中のAl濃度の調整方法。
- 溶融亜鉛めっきライン中のフロントサポートロールが浸漬された溶融亜鉛浴を収容する溶融亜鉛ポットにZn-Al合金を供給する装置であって、
下部に供給部を有し、前記溶融亜鉛ポットの鋼板の進行方向における下流側の内壁と前記溶融亜鉛浴中に設置された前記フロントサポートロールとの間に設置されたパイプ状の挿入ガイドと;
前記挿入ガイドの内部へ不活性ガスを供給するガス供給装置と;
を有し、
前記供給部の設置位置が、前記溶融亜鉛浴中でかつ前記フロントサポートロールの下端から±400mm以内の深さであり、
前記Zn-Al合金は、前記挿入ガイドの前記供給部から前記溶融亜鉛浴中に供給される;
ことを特徴とする溶融亜鉛ポットへのZn‐Al合金供給装置。
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CN201380001688.9A CN103620080B (zh) | 2012-03-05 | 2013-03-04 | 向熔融锌锅供给Zn-Al合金的方法、熔融锌液中Al浓度的调整方法以及向熔融锌锅供给Zn-Al合金的装置 |
MX2013014821A MX349453B (es) | 2012-03-05 | 2013-03-04 | Método de suministro de la aleación zn-ai al crisol de zinc fundido, método de ajuste de la concentración de ai en el baño de zinc fundido, y aparato para el suministro de la aleación zn-ai al crisol de zinc fundido. |
US14/124,306 US9458530B2 (en) | 2012-03-05 | 2013-03-04 | Method of supplying Zn—Al alloy to molten zinc pot, method of adjusting concentration of Al in molten zinc bath, and apparatus for supplying Zn—Al alloy to molten zinc pot |
BR112013032170-9A BR112013032170B1 (pt) | 2012-03-05 | 2013-03-04 | Método de suprimento de liga de zn-al a uma cuba de zinco fundido, método de ajuste da concentração de al em banho de zinco fundido, e aparelho para suprimento de liga de zn-al a cuba de zinco fundido |
JP2013531594A JP5423929B1 (ja) | 2012-03-05 | 2013-03-04 | 溶融亜鉛ポットへのZn−Al合金供給方法、溶融亜鉛浴中Al濃度の調整方法及び、溶融亜鉛ポットへのZn−Al合金供給装置 |
KR1020137032806A KR101555118B1 (ko) | 2012-03-05 | 2013-03-04 | 용융 아연 포트에의 Zn―Al 합금 공급 방법, 용융 아연욕 중 Al 농도의 조정 방법 및, 용융 아연 포트에의 Zn―Al 합금 공급 장치 |
US15/254,972 US9834834B2 (en) | 2012-03-05 | 2016-09-01 | Apparatus for supplying Zn—Al alloy to molten zinc pot |
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US15/254,972 Division US9834834B2 (en) | 2012-03-05 | 2016-09-01 | Apparatus for supplying Zn—Al alloy to molten zinc pot |
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