WO2018181940A1 - 溶融金属めっき鋼帯の製造方法およびその製造装置 - Google Patents
溶融金属めっき鋼帯の製造方法およびその製造装置 Download PDFInfo
- Publication number
- WO2018181940A1 WO2018181940A1 PCT/JP2018/013738 JP2018013738W WO2018181940A1 WO 2018181940 A1 WO2018181940 A1 WO 2018181940A1 JP 2018013738 W JP2018013738 W JP 2018013738W WO 2018181940 A1 WO2018181940 A1 WO 2018181940A1
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- WIPO (PCT)
- Prior art keywords
- roll
- steel strip
- gap
- bath
- molten metal
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 90
- 239000010959 steel Substances 0.000 title claims abstract description 90
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 27
- 239000002184 metal Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title abstract description 11
- 238000007747 plating Methods 0.000 claims abstract description 58
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 44
- 238000004519 manufacturing process Methods 0.000 claims description 27
- 229910001335 Galvanized steel Inorganic materials 0.000 claims 1
- 239000008397 galvanized steel Substances 0.000 claims 1
- 238000005246 galvanizing Methods 0.000 description 10
- 238000000926 separation method Methods 0.000 description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 6
- 229910052725 zinc Inorganic materials 0.000 description 6
- 239000011701 zinc Substances 0.000 description 6
- 238000007654 immersion Methods 0.000 description 5
- 239000010410 layer Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 210000004894 snout Anatomy 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Images
Classifications
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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
-
- 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
Definitions
- the present invention relates to a method for manufacturing a molten metal plated steel strip and a manufacturing apparatus therefor.
- a foreign substance called dross is generated in a continuous hot dip galvanizing method in which a hot dip galvanizing bath is manufactured by using a hot dip galvanizing bath as a hot dip galvanizing bath and allowing the steel strip to be continuously immersed and passed through the plating bath. It is known. The reason for this is that when the steel strip passes through the hot dip galvanizing bath, iron eluted from the steel strip reacts with the constituent elements (zinc and aluminum) in the hot dip galvanizing bath to produce intermetallic compounds. It is known that it occurs when zinc is oxidized.
- dross having a density higher than that of zinc becomes bottom dross (mainly Fe—Zn alloy) and settles and deposits in the hot dip galvanizing bath.
- bottom dross mainly Fe—Zn alloy
- top dross mainly zinc oxide, Fe—Al alloy
- Patent Document 1 discloses a current plate that is opposed to a band to be plated positioned between the sink roll and the support roll at a position that does not overlap the sink roll in a top view. Disclosed is a technology for guiding the flow of the accompanying flow, which has been changed by the support roll coming into contact with the plate to be plated, by the current plate, between the lower side of the sink roll or between the sink roll and the bottom of the bathtub Has been.
- Patent Document 2 discloses a technique for controlling the flow of molten zinc by arranging a baffle plate in the vicinity of the bath surface above the sink roll.
- the technique of the above-mentioned prior art document 1 separates the accompanying flow generated along with the passage of the zone to be plated and the flow at the bottom of the bath by introducing a current plate, and this suppresses the rolling up of the bottom dross.
- the plating bath is introduced from the outlet side of the support roll. It was inevitable that top dross floating in the plating bath in the region up to the bath surface of the steel would adhere to the steel strip.
- An object of the present invention is to produce a molten metal plated steel strip that can effectively avoid quality degradation of the steel strip due to adhesion of floating top dross in the region from the exit side of the support roll to the bath surface of the plating bath A method and a manufacturing apparatus thereof are proposed.
- a steel strip is continuously immersed in a bathtub containing a molten metal plating bath, and the direction of travel of the steel strip is changed by a sink roll disposed in the bath, and then the upper side of the sink roll and Molten metal with a plating layer formed on the outer surface by passing between the support rolls consisting of two rolls on the stabilizing side and the collect side, which are installed under the bath surface of the plating bath, and drawing them out of the bath.
- a rectifying plate that covers at least the upper surface side of the roll cylinder with a gap is disposed on the stabilizing side roll, and a space between the support roll exit side and the bath surface of the plating bath.
- a method of manufacturing a molten metal plated steel strip characterized by guiding a flow of a molten metal plating bath toward a steel strip located at a lower side of a roll on the stabilizing side through the gap.
- the gap dimension is continuously or intermittently enlarged from the entry side to the exit side of the gap, or the gap dimension is continuous or intermittent from the entry side to the center of the gap. It is preferable that the gap size is continuously or intermittently reduced from the enlarged portion of the gap size toward the exit side of the gap.
- the present invention provides a sink roll that is disposed in a bathtub that accommodates a molten metal plating bath and changes a traveling direction of a steel strip that is continuously immersed in the bathtub, and above the sink roll,
- a support roll composed of two rolls on the stabilizing side and the collect side, which is installed under the bath surface of the bath, and passes between the support rolls through a steel strip whose traveling direction has been changed by the sink roll.
- the gap from the inner wall to the roll drum of the stabilizing roll is 5 to 60 mm, and the distance from the upper end to the surface of the steel strip
- the horizontal distance is 50 to 100 mm, and the roll cylinder of the roll on the stabilizing side is 60 to 135 ° from the upper end to the bottom of the bathtub with respect to the rotation center of the roll.
- An apparatus for producing a molten metal-plated steel strip characterized in that a rectifying plate having a length covering the area is provided.
- the present invention provides a sink roll that is disposed in a bathtub that accommodates a molten metal plating bath and changes a traveling direction of a steel strip that is continuously immersed in the bathtub, and a molten metal plating that is above the sink roll and that is above the molten metal plating.
- a support roll composed of two rolls on the stabilizing side and the collect side, which is installed under the bath surface of the bath, and passes between the support rolls through a steel strip whose traveling direction has been changed by the sink roll.
- the gap from the inner wall to the roll cylinder of the stabilizing side roll is 10 to 40 mm, from the upper end to the surface of the steel strip.
- the distance between the horizontal rolls is 50 to 100 mm, and the roll cylinder of the roll on the stabilizing side is directed to the bottom side of the bathtub from the upper end on the basis of the rotation center of the roll.
- An apparatus for producing a hot-dip metal-plated steel strip characterized in that a rectifying plate having a length covering in a range of is provided.
- the gap dimension is continuously or intermittently enlarged from the entry side to the exit side of the gap, or the gap dimension is continuous or intermittent from the entry side to the center of the gap. It is preferable that the gap dimension is continuously or intermittently reduced from the enlarged portion of the gap dimension toward the exit side of the gap.
- the continuous expansion and reduction of the gap dimension means that the gap dimension gradually increases and decreases along the outer surface of the roll cylinder of the stabilizing side roll.
- the fact that the dimension is intermittently enlarged and reduced means that the gap dimension is enlarged and reduced stepwise (stepwise) along the outer surface of the roll cylinder of the roll on the stabilizing side.
- the flow of the molten metal plating bath toward the steel strip located between the exit side of the support roll and the bath surface of the plating bath is directed away from the steel strip by the current plate, that is, Since it can guide to the lower side of the roll on the stabilizing side, it is possible to suppress the top dross from adhering to the steel strip in that region.
- the gap is tapered such that the gap dimension continuously or intermittently expands from the entry side to the exit side of the gap, or the gap dimension is continuous from the entry side to the center of the gap, or
- a dross near the steel strip in the plating bath is formed by a mountain-shaped, crescent-shaped shape in which the gap dimension continuously or intermittently decreases from the central portion toward the exit side of the gap while intermittently expanding. It can be discharged efficiently.
- the gap into a mountain shape and a crescent shape, the flow rate of the molten metal plating bath located in the gap is increased, and the dross discharge efficiency near the steel strip is further enhanced.
- FIG. 1 is a diagram (sectional view) schematically showing an apparatus for producing a molten metal-plated steel strip suitable for use in the practice of the present invention
- FIG. 2 is an enlarged view of the main part of the apparatus shown in FIG. FIG.
- reference numeral 1 is a bathtub for housing a molten metal plating bath M
- 2 is a snout for guiding the steel strip S to be plated into the bathtub 1 and the tip portion is immersed in the plating bath
- 3 is in the bathtub 1 Is installed on the sink roll 4 for changing the traveling direction of the steel strip S
- 4 is provided above the sink roll 3 and below the bath surface of the molten metal plating bath, and is a support roll for guiding the steel strip S and correcting its shape. It is.
- the support roll 4 is composed of two rolls, a roll 4a on the stabilizing side (a support roll on the side closer to the bath surface (upper side)) and a roll 4b on the collect side (a support roll on the side farther from the bath surface (lower side)). Has been.
- Numeral 5 is a wiping nozzle disposed so as to sandwich the steel strip S on the bath surface of the molten metal plating bath.
- the wiping nozzle 5 has a function of adjusting the thickness of the plating layer by blowing gas to the outer surface of the steel strip S on the outlet side of the plating bath.
- Numeral 6 is a current plate that covers at least the upper surface side of the stabilizing roll 4a with a gap t (see FIG. 2).
- the current plate 6 has an inner wall 6a formed along the outer surface of the roll body of the stabilizing roll 4a.
- the current plate 6 is preferably equal to or wider than the roll body of the roll 4a.
- the rectifying plate 6 may be made of a material that is resistant to molten zinc.
- SUS having a thickness of 15 mm or more or a steel material provided with a ceramic coat is suitable.
- the gap t is such that the gap dimension continuously or intermittently expands from the entry side t1 to the exit side t2 of the gap t, for example, as shown in FIG. 3, or from the entry side t1 of the gap t to the center. While the gap dimension continuously or intermittently expands toward the portion t3, the gap dimension continuously or intermittently decreases from the central portion t3, which is the maximum expansion portion of the gap dimension, toward the exit side t2 of the gap t.
- FIG. 4 shows an example of the gap t, and are not limited to the illustrated shape.
- the gap dimension of the central portion t3 of the gap t is shown as the largest, but the place where the gap dimension is the largest is the entry side of the gap t. You may shift to the t1 side or the exit t2 side.
- FIG. 6 Normally, in the surface layer region of the plating bath, since the plating bath flows toward the steel strip S as shown in FIG. 5 (flows from the wall surface side of the bathtub 1 toward the steel strip S), FIG. 6 or FIG. As shown in Fig. 3, the apparatus (conventional apparatus) in which the current plates 7 and 8 are installed behind the roll 4a in the plating bath on the side of the stabilizing roll 4a (the support roll on the side close to the bath (upper side)) is applied.
- the flow of the plating bath is allowed to flow through the gap t to the stabilizing side, although it is difficult to avoid the top dross existing in the region. Therefore, adhesion of the top dross to the steel strip S can be suppressed.
- the gap t is set to 5 to 60 mm because the flow of the plating bath can be efficiently guided to the entry side of the gap t by setting the gap t to 5 to 60 mm. It is.
- the gap t is more preferably 10 to 40 mm.
- the separation distance L from the upper end portion 6b of the current plate 6 to the surface of the steel strip S is set to 50 to 100 mm, because the separation distance L is set to 50 to 100 mm. This is because the flow of the plating bath can be smoothly introduced into the gap t. If the separation distance L exceeds 100 mm, the distance to the steel strip S becomes too wide, so that it is difficult to guide the dross into the gap t and the dross is caught in the steel strip S, while the separation distance L is 50 mm. If it is less than that, the dross may adhere to the steel strip S when the dross is guided into the gap t.
- the current plate 6 covers the roll cylinder of the roll 4a on the stabilizing side in the range of 60 to 135 ° because the range covers the roll cylinder of the roll 4a on the stabilizing side. Is less than 60 °, the flow of the plating bath cannot be efficiently guided to the lower side of the stabilizing side roll 4a, while the range covering the roll cylinder of the stabilizing side roll 4a exceeds 135 °. This is because there is a concern that the flow of the plating bath reaches the steel strip S located below the stabilizing side roll 4a and entrains the dross.
- the upper end of the immersion depth of the current plate 6 is preferably 10 mm or less from the bath surface so as not to inhibit surface layer flow. Moreover, the upper end of the immersion depth of the current plate 6 is installed above the upper surface of the support roll 4 (position close to the liquid level). The upper end of the dipping depth of the rectifying plate 6 is automatically determined by the installation position of the roll 4a on the stabilizing side of the support roll 4, for example, the stabilizing of the support roll 4 at a position 60 mm deep from the bath surface. If the upper surface of the side roll 4a is located, the thickness of the current plate 6 is 10 mm, and the gap t is 10 mm, the upper end of the immersion depth of the current plate 6 is located at a depth of 40 mm from the bath surface. It will be.
- the stabilizing roll 4a is disposed on the back side of the steel strip S (the steel plate side in the positional relationship between the sink roll and the steel plate), and the collect side roll 4b is disposed on the front side of the steel strip S (sink roll).
- the example is described on the sink roll side
- the collect side roll 4b is arranged on the back side of the steel strip S
- the stabilizing side roll 4a is arranged on the front side of the steel strip.
- the rectifying plate 6 is provided on the roll positioned above, that is, the roll 4a on the stabilizing side.
- Example 1 A cold rolled steel strip having a width of 800 to 1900 mm and a thickness of 0.4 to 4.0 mm is applied to a manufacturing apparatus as shown in FIG. Hot dip galvanization after performing hot dip galvanizing treatment under the conditions of 460 ° C., plating adhesion amount: 45 to 90 g / m 2 per side, and line speed: 60 to 150 mpm.
- Example 2 It has a structure as shown in FIG. 3 having a gap having a taper shape in which the gap dimension is continuously enlarged from the entrance side to the exit side of the gap (gap dimension of the entry side t1 is 10 mm and the gap dimension of the exit side t2 is 20 mm).
- Manufacturing device top of immersion depth of rectifying plate: 10 mm, angle ⁇ : 90 °, separation distance L: 100 mm) and gap size continuously enlarged from the entrance side to the center of the gap (gap on entry side t1) FIG.
- Example 4 shows a crescent-shaped gap having a size of 10 mm and a gap size of 40 mm at the center portion t3, while the gap size is reduced from the center portion toward the exit side of the gap (a gap size of 10 mm at the exit side t2).
- the manufacturing apparatus the upper end of the rectifying plate immersion depth: 40 mm, the angle ⁇ : 135 °, the separation distance L: 100 mm
- Dross when applied was investigated foreign matter number average of factors (conditions of the plating process, check condition number of foreign matter average of dross caused Same as Example 1).
- the average number of foreign matters caused by dross is 13.5, which is a further improvement in quality compared to the number 4 in Table 1.
- the average number of foreign substances caused by dross is 1.1 for those having a crescent-shaped gap, which is a further improvement in quality compared to No. 6 in Table 1. It was confirmed that it was possible.
- the present invention it is possible to provide a method and a manufacturing apparatus capable of manufacturing a hot-dip metal-plated steel strip in which surface defects due to adhesion of dross are suppressed.
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Abstract
Description
該サポートロールのうちのスタビライジング側のロールに、そのロール胴の少なくとも上面側を隙間を隔てて覆い隠す整流板を配置し、該サポートロールの出側からめっき浴の浴面に至るまでの間に位置する鋼帯へ向かう溶融金属めっき浴の流れを、該隙間を通して該スタビライジング側のロールの下方側へ誘導することを特徴とする溶融金属めっき鋼帯の製造方法である。前記隙間としては、該隙間の入側から出側に向けて隙間寸法が連続的または断続的に拡大するもの、あるいは、該隙間の入側から中央部へ向けて隙間寸法が連続的または断続的に拡大する一方、該隙間寸法の拡大部位から該隙間の出側へ向けて隙間寸法が連続的または断続的に縮小するものが好ましい。
図1は、本発明の実施に用いて好適な溶融金属めっき鋼帯の製造装置を模式的に示した図(断面表示)であり、図2は、図1に示した装置の要部を拡大して示した図である。
幅800~1900mm、厚さ0.4~4.0mmの冷延鋼帯を、表1に示すような整流板を設置した上掲図1に示す如き製造装置を適用して浴温度:450~460℃、めっき付着量:片面当たり45~90g/m2、ライン速度:60~150mpmの条件のもとに溶融亜鉛めっき処理を実施し、該冷延鋼帯を300t処理した後の溶融亜鉛めっき鋼帯(コイル)から、500mm×500mmの供試材各5枚を採取し、採取した各5枚の供試材にハット型加工(ポンチ径:300mmφ(R:21mm)、しわ押さえ圧:320kN、ポンチスピード:320mm/min、成形高さ:27mm)を施し、得られた5個のハットの上面の平坦部分をそれぞれ♯150の砥石で一往復研磨した後にドロス起因の異物の個数を測定し、ハット5個の異物の個数を平均してハット1個当たりの異物個数として表1に示した。なお、砥石でハットの上面を研磨したのは、異物を目視で確認しやすくするためである。
隙間の入側から出側に向けて隙間寸法を連続的に拡大(入側t1の隙間寸法10mm、出側t2の隙間寸法20mm)したテーパー形状をなす隙間を有する図3に示す如き構造からなる製造装置(整流板の浸漬深さの上端:10mm、角度θ:90°、離間距離L:100mm)および隙間の入側から中央部へ向けて隙間寸法を連続的に拡大(入側t1の隙間寸法10mm、中央部t3の隙間寸法40mm)する一方、該中央部から隙間の出側に向けて隙間寸法を縮小(出側t2の隙間寸法10mm)した三日月形状をなす隙間を有する図4に示す如き構造からなる製造装置(整流板の浸漬深さの上端:40mm、角度θ:135°、離間距離L:100mm)を使用して実施例1と同様の冷延鋼帯に溶融亜鉛めっき処理を施した場合のドロス起因の異物個数平均値を調査した(めっき処理の条件、ドロス起因の異物個数平均値の調査条件は実施例1と同じ)。その結果、テーパー形状をなす隙間を有するものにあってはドロス起因の異物個数平均値(個/ハット1個)は13.5であり、表1の番号4のものに比較してさらに品質改善が可能であることが、また、三日月形状をなす隙間を有するものにあってはドロス起因の異物個数平均値は1.1であり、表1の番号6のものに比較してさらに品質改善が可能であることが確認された。
2 スナウト
3 シンクロール
4 サポートロール
4a スタビライジング側のロール
4b コレクト側のロール
5 ワイピングノズル
6 整流板
6a 内壁
6b 上側先端部
7 整流板
8 整流板
S 鋼帯
Claims (7)
- 溶融金属めっき浴を収容する浴槽に鋼帯を連続的に浸漬させ、該浴槽中に配設されたシンクロールにより該鋼帯の進行方向を転換したのち、該シンクロールの上方かつ、めっき浴の浴面下に設置された、スタビライジング側およびコレクト側の2つのロールからなるサポートロールの相互間を通過させて浴外へ引き出すことにより外表面にめっき層が形成された溶融金属めっき鋼帯を製造する方法において、
該サポートロールのうちのスタビライジング側のロールに、そのロール胴の少なくとも上面側を隙間を隔てて覆い隠す整流板を配置し、該サポートロールの出側からめっき浴の浴面に至るまでの間に位置する鋼帯へ向かう溶融金属めっき浴の流れを、該隙間を通して該スタビライジング側のロールの下方側へ誘導することを特徴とする溶融金属めっき鋼帯の製造方法。 - 前記隙間は、該隙間の入側から出側に向けて隙間寸法が連続的または断続的に拡大するものであることを特徴とする請求項1に記載した溶融金属めっき鋼帯の製造方法。
- 前記隙間は、該隙間の入側から中央部へ向けて隙間寸法が連続的または断続的に拡大する一方、該隙間寸法の拡大部位から該隙間の出側へ向けて隙間寸法が連続的または断続的に縮小するものであることを特徴とする請求項1に記載した溶融金属めっき鋼帯の製造方法。
- 溶融金属めっき浴を収容する浴槽内に配置され該浴槽内に連続的に浸漬される鋼帯の進行方向を転換するシンクロールと、該シンクロールの上方かつ、溶融金属めっき浴の浴面下に設置された、スタビライジング側およびコレクト側の2つのロールからなるサポートロールとを備え、該シンクロールにより進行方向が転換された鋼帯を、該サポートロールの相互間を通過させて浴外へ引き出すことにより外表面にめっき層が形成された溶融金属めっき鋼帯を製造する製造装置であって、
該サポートロールのうちのスタビライジング側のロールに、そのロール胴の外表面に沿う内壁を有し該内壁から該スタビライジング側のロールのロール胴に至るまでの隙間が5~60mm、上側先端部から該鋼帯の表面に至るまでの離間距離が水平距離にして50~100mmであり、かつ、該スタビライジング側のロールのロール胴を該ロールの回転中心を基準にして該上側先端部から該浴槽の底部側へ向け60~135°の範囲で覆う長さをもった整流板を設けた、ことを特徴とする溶融金属めっき鋼帯の製造装置。 - 溶融金属めっき浴を収容する浴槽内に配置され該浴槽内に連続的に浸漬される鋼帯の進行方向を転換するシンクロールと、該シンクロールの上方かつ、溶融金属めっき浴の浴面下に設置された、スタビライジング側およびコレクト側の2つのロールからなるサポートロールとを備え、該シンクロールにより進行方向が転換された鋼帯を、該サポートロールの相互間を通過させて浴外へ引き出すことにより外表面にめっき層が形成された溶融金属めっき鋼帯を製造する製造装置であって、
該サポートロールのうちのスタビライジング側のロールに、そのロール胴の外表面に沿う内壁を有し該内壁から該スタビライジング側のロールのロール胴に至るまでの隙間が10~40mm、上側先端部から該鋼帯の表面に至るまでの離間距離が水平距離にして50~100mmであり、かつ、該スタビライジング側のロールのロール胴を該ロールの回転中心を基準にして該上側先端部から該浴槽の底部側へ向け60~135°の範囲で覆う長さをもった整流板を設けた、ことを特徴とする溶融金属めっき鋼帯の製造装置。 - 前記隙間は、該隙間の入側から出側に向けて隙間寸法が連続的または断続的に拡大するものであることを特徴とする請求項4または5に記載した溶融金属めっき鋼帯の製造装置。
- 前記隙間は、該隙間の入側から中央部へ向けて隙間寸法が連続的または断続的に拡大する一方、該隙間寸法の拡大部位から該隙間の出側へ向けて隙間寸法が連続的または断続的に縮小するものであることを特徴とする請求項4または5に記載した溶融金属めっき鋼帯の製造装置。
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