WO2023105910A1 - ガスワイピングノズル及び溶融金属めっき鋼帯とガスワイピングノズルの製造方法 - Google Patents
ガスワイピングノズル及び溶融金属めっき鋼帯とガスワイピングノズルの製造方法 Download PDFInfo
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- WO2023105910A1 WO2023105910A1 PCT/JP2022/037767 JP2022037767W WO2023105910A1 WO 2023105910 A1 WO2023105910 A1 WO 2023105910A1 JP 2022037767 W JP2022037767 W JP 2022037767W WO 2023105910 A1 WO2023105910 A1 WO 2023105910A1
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- Prior art keywords
- gas wiping
- wiping nozzle
- steel strip
- ppi
- nozzle
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 61
- 239000010959 steel Substances 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 229910052751 metal Inorganic materials 0.000 claims abstract description 53
- 239000002184 metal Substances 0.000 claims abstract description 53
- 239000000919 ceramic Substances 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims description 24
- 230000003746 surface roughness Effects 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 8
- 238000003672 processing method Methods 0.000 claims description 8
- 230000007547 defect Effects 0.000 abstract description 12
- 239000007789 gas Substances 0.000 description 77
- 238000007747 plating Methods 0.000 description 12
- 239000002344 surface layer Substances 0.000 description 11
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 9
- 229910052725 zinc Inorganic materials 0.000 description 9
- 239000011701 zinc Substances 0.000 description 9
- 238000005422 blasting Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 238000005520 cutting process Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 229910001335 Galvanized steel Inorganic materials 0.000 description 5
- 239000008397 galvanized steel Substances 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- VNTLIPZTSJSULJ-UHFFFAOYSA-N chromium molybdenum Chemical compound [Cr].[Mo] VNTLIPZTSJSULJ-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005246 galvanizing Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000005524 ceramic coating Methods 0.000 description 2
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 210000004894 snout Anatomy 0.000 description 2
- 229910003470 tongbaite Inorganic materials 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000012951 Remeasurement Methods 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052575 non-oxide ceramic Inorganic materials 0.000 description 1
- 239000011225 non-oxide ceramic Substances 0.000 description 1
- 229910052574 oxide ceramic Inorganic materials 0.000 description 1
- 239000011224 oxide ceramic Substances 0.000 description 1
- 238000005240 physical vapour deposition Methods 0.000 description 1
- 238000003969 polarography Methods 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- -1 sialon Chemical compound 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 238000007581 slurry coating method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
- C23C2/18—Removing excess of molten coatings from elongated material
- C23C2/20—Strips; Plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/005—Nozzles or other outlets specially adapted for discharging one or more gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
- B05B1/04—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like
- B05B1/044—Slits, i.e. narrow openings defined by two straight and parallel lips; Elongated outlets for producing very wide discharges, e.g. fluid curtains
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
- B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
-
- 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
-
- 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
-
- 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
Definitions
- the present invention provides a gas wiping nozzle used in a hot-dip metal plating line for producing a hot-dip metal plated steel strip widely used in the fields of construction materials, automobiles, home appliances, etc., the hot-dip metal-plated steel strip and the gas wiping.
- the present invention relates to a nozzle manufacturing method.
- Hot-dip galvanized steel sheets which are a type of hot-dip galvanized steel strip, are widely used in fields such as building materials, automobiles, and home appliances. In these applications, hot-dip galvanized steel sheets are required to have excellent appearance. Here, since the appearance after coating is strongly affected by surface defects such as coating thickness unevenness, flaws, and adhesion of foreign matter, it is important that hot-dip galvanized steel sheets do not have surface defects.
- a steel strip S annealed in a continuous annealing furnace in a reducing atmosphere passes through a snout 10 and continuously enters a molten metal bath 14 in a plating tank 12.
- the steel strip S is pulled up above the molten metal bath 14 through the sink roll 16 and the support roll 18 in the molten metal bath 14, and after being adjusted to a predetermined plating thickness by the gas wiping nozzles 20, 20', It is cooled and led to the post-process.
- the gas wiping nozzles 20, 20' are arranged above the plating tank 12 so as to face each other with the steel strip S interposed therebetween, and blow gas toward both surfaces of the steel strip S from their injection ports. By this gas wiping, surplus molten metal is scraped off, the amount of plating deposited on the surface of the steel strip is adjusted, and the molten metal deposited on the surface of the steel strip is made uniform in the strip width direction and strip longitudinal direction.
- the gas wiping nozzles 20, 20′ are generally wider than the width of the steel strip, in order to accommodate various widths of the steel strip and to cope with misalignment in the width direction when the steel strip is pulled up. It extends outward from the end.
- a pair of gas wiping nozzles 20, 20' are arranged above the plating bath 12 so as to face each other with the steel strip S interposed therebetween.
- the gas wiping nozzles 20, 20' blow gas toward the steel strip S from injection ports 24 (slits) extending in the width direction X of the steel strip at their tips. Gas is blown toward one side of the steel strip from one gas wiping nozzle 20, and gas is blown toward the other side of the steel strip from the other gas wiping nozzle 20'.
- surplus molten metal is scraped off on both surfaces of the steel strip S, the coating amount is adjusted, and the thickness is made uniform in the width direction X and the length direction Z.
- the gas wiping nozzles 20, 20′ are usually configured to be longer than the width of the steel strip in order to accommodate various widths of the steel strip and to cope with positional deviation in the width direction when the steel strip is pulled up. It extends outward from the end.
- the wiping nozzle 20 has a nozzle header 26 and an upper nozzle member 21 and a lower nozzle member 22 connected to this nozzle header 26 .
- a slit 24 is defined at the tip of the wiping nozzle 20, and a hollow portion 25 communicating with the slit 24 is defined. That is, the tip portions of the upper and lower nozzle members 21 and 22 have planes facing each other in parallel, and the space between these planes serves as the slit 24 .
- the slit 24 constitutes a gas injection port and extends in the sheet width direction X. As shown in FIG.
- Patent Document 1 the surface of the gas ejection tip of the gas wiping nozzle is subjected to a surface treatment that implants ions such as carbon, nitrogen, boron, silicon, etc., to reduce the wettability of the splash and the nozzle, thereby reducing the splash. Techniques for easy removal are described.
- Patent Document 2 describes a technique for easily removing splash, like Patent Document 1, by forming the injection port of a gas wiping nozzle with a carbon material or ceramics.
- Patent Documents 1 and 2 did not completely remove the splash, and some of the splash remained. If the splash remains, the splash further accumulates and grows starting from that portion, and as the operating time increases, a more conspicuous linear mark is generated. Furthermore, when attempting to remove the adhering splashes by maintenance, a great deal of labor and time are required to remove them, and furthermore, there arises a problem that the surface of the nozzle is damaged.
- the present invention provides a gas wiping nozzle, a hot dip metal plated steel strip, and a gas wiping nozzle that can easily remove the molten metal splash and obtain a beautiful steel sheet without linear mark defects. It aims at providing the manufacturing method of.
- the gas wiping nozzle of the present invention uses a material that is difficult to wet with molten metal.
- Materials that are difficult to wet with molten metal refer to ceramics.
- a gas wiping nozzle that blows gas onto a steel strip pulled up from a molten metal bath to adjust the adhesion amount of molten metal on the surface of the steel strip, wherein at least the surface of the gas wiping nozzle is made of ceramics.
- the arithmetic mean roughness Ra and the peak count PPI which are indices indicating the surface roughness of the gas wiping nozzle, satisfy the following formula (1).
- PPI peak count (number of peaks per inch)
- Ra Arithmetic mean roughness [ ⁇ m] c1, c2: Constants
- the present invention provides a gas wiping nozzle that can easily remove the molten metal splash and manufacture a beautiful steel sheet without linear mark defects. As a result, in the production of hot-dip metal-plated steel strips, the yield is remarkably increased, and the industrial utility value is extremely high.
- FIG. 1 is a schematic diagram showing the configuration of a continuous hot-dip metal plating facility used in one embodiment of the present invention.
- FIG. 2 is a schematic perspective view of the gas wiping nozzle of the present invention.
- FIG. 3 is a schematic cross-sectional view of the gas wiping nozzle of the present invention perpendicular to the steel strip and bath surface.
- FIG. 4 is a schematic diagram showing the relationship between surface roughness and wettability based on Wenzel's formula.
- FIG. 5 is a graph showing the determination of the zinc deposition amount in relation to the arithmetic mean roughness Ra and the peak count PPI.
- FIG. 1 schematically shows the configuration of a continuous hot-dip galvanizing facility 100 used in one embodiment of the present invention.
- a conventional one can be used as the continuous hot dip galvanizing equipment 100 of the present invention.
- FIG. 2 is a perspective view schematically showing the gas wiping nozzle 20 of the present invention.
- the gas wiping nozzle 20 blows gas onto the steel strip S drawn up from the molten metal bath to adjust the amount of molten metal adhered to the surface of the steel strip. A conventional method can be used.
- the present invention is characterized by the material and surface roughness of the nozzle surface layer 23 of the gas wiping nozzle 20 with which the molten metal (splash) contacts. That is, at least the surface of the gas wiping nozzle 20 (that is, the nozzle surface layer 23) needs to be made of ceramics.
- the nozzle surface layer portion 23 is a region indicated by a dashed line as 23 in FIG. That is, on the outer surfaces of the upper and lower nozzle members 21 and 22, the region from AA' indicated by the two-dotted dashed line to the tip of the gas wiping nozzle 20 and not including the surface facing the hollow portion 25 of the nozzle. be.
- the gas wiping nozzle 20 is entirely made of ceramics, not just the surface.
- the reason why at least the surface of the gas wiping nozzle 20 is made of ceramic is that the ceramic does not react with the molten metal, so that it does not stick and the splash can be easily removed. Furthermore, as shown in FIG. 4, by increasing the surface roughness of the ceramics, the wettability between the molten metal and the gas wiping nozzle 20 is reduced, and the splash caused by the molten metal can be more easily removed. , the advantage of suppressing film thickness unevenness defects is obtained.
- the ceramics include oxide ceramics such as alumina, zirconia, magnesium oxide, and chromium oxide, and carbide ceramics such as silicon carbide, titanium carbide, and chromium carbide.
- carbide ceramics such as silicon carbide, titanium carbide, and chromium carbide.
- nitride ceramics such as silicon nitride, titanium nitride, sialon, and boron nitride
- boride ceramics such as zirconium boride and titanium boride are suitable, but the material is not limited to these.
- the carbide ceramics, nitride ceramics, and boride ceramics exemplified here may be collectively referred to as non-oxide ceramics.
- splashes often adhere to the vicinity of the ejection port of the gas wiping nozzle, so the upper nozzle member 21 and the lower nozzle member 22 shown in FIG. preferably.
- the method of forming the ceramic coating when forming the nozzle surface layer portion 23 with a ceramic coating is as follows. CVD method (low pressure, plasma) in vapor phase method, PVD method (vacuum deposition, ion plating), thermal spraying method in melt method, or slurry coating method in which a solution is applied and baked are suitable. It is not limited.
- the film thickness depends on the type of film and the method of forming the film, but is preferably about 5 to 100 ⁇ m in consideration of peeling due to nozzle cleaning.
- the surface roughness and PPI are controlled on the surface of the gas wiping nozzle 20 (that is, the nozzle surface layer 23).
- Formula (2) shows Wenzel's formula representing the relationship between the surface roughness and the wettability of the solid surface.
- Formula (2) is shown in Non-Patent Document 1.
- cos ⁇ w r cos ⁇ e (2)
- ⁇ e Contact angle of the liquid droplet leveled on the smooth surface
- r Area ratio of the roughened surface to the flat surface (r ⁇ 1)
- FIG. 4 shows a diagram schematically showing the wettability based on the formula (2).
- FIG. 4 shows that as the surface roughness increases, the contact angle further increases, in other words, the wettability decreases.
- the inventors decided to evaluate the wettability using the arithmetic mean roughness Ra and the peak count PPI, which are indices representing the surface roughness, instead of r in the formula (2). Specifically, the relationship between Ra and peak count PPI and wettability was investigated from experimental values by preparing samples with different Ra and PPI. The details and conditions of the experiment will be described below.
- test pieces with different surface roughness were immersed in the molten metal bath for a predetermined time, they were air-cooled to room temperature.
- the value obtained by dividing the difference in test piece weight before and after the experiment by the immersion area was recorded as the amount of zinc deposited [ ⁇ g/m 2 ], and judgment was made according to the following criteria.
- Test piece material Sialon Test piece dimensions: length 50 mm x width 50 mm x thickness 3 mm Arithmetic mean roughness Ra of test piece surface: 0.01 to 5 ⁇ m Peak count PPI on the surface of the test piece: 5 to 300 Molten metal species and temperature: Zinc 460°C Test time: 30 seconds The experimental results are shown in FIG. The arithmetic mean roughness Ra was measured according to JIS B 0601-2001. The cutoff wavelength for Ra measurement was set to 0.8 mm. The peak count PPI was measured according to SAE J911.
- the peak count level for PPI measurements was 0.635 ⁇ m. As can be seen from FIG. 5, it was found that the amount of zinc deposited decreased as Ra and PPI increased.
- the arithmetic mean roughness Ra is an index indicating the average height of irregularities obtained from the roughness curve of the ceramic surface.
- the area ratio of the rough surface increases.
- the peak count PPI is an index representing the number of protrusions per inch of the roughness curve of the ceramic surface. As the peak count PPI increases, the surface of the ceramics is given unevenness with a short pitch, so the area ratio of the rough surface to the smooth surface increases.
- the arithmetic mean roughness Ra and peak count PPI of the surface of the gas wiping nozzle satisfy formula (1).
- the values of the constants c1, c2 in the formula (1) change depending on the material of the ceramics used for the nozzle surface layer 23, so they need to be determined appropriately when manufacturing the gas wiping nozzle.
- the method for calculating c1 and c2 is calculated according to the following steps. Step 1: Determine the material of the nozzle and the composition of the molten metal.
- the processing method for giving the arithmetic mean roughness Ra and the peak count PPI can be arbitrarily selected. Examples include grinding (a cutting method using a grinder) and blasting (a processing method for imparting roughness by colliding with a workpiece called a projection material), but are not limited to these.
- Step 2 Prepare 10 to 20 samples with different Ra and PPI. From the viewpoint of processing accuracy of the wiping nozzle, it is desirable that the upper limit of Ra is 10 ⁇ m or less and the upper limit of PPI is 500 or less.
- Step 3 Perform the experiment described above and plot the graph shown in FIG.
- Step 6 Y is calculated by changing the values of c1′ and c2′ five times, and c1′ and c2′ when Y is the smallest are set to c1 and c2. Each constant is a constant calculated by multiple regression.
- the constants c1 and c2 in the equation (1) are mainly correlated with the free energy of formation when the ceramics used for the nozzle surface layer 23 generate oxides, and may be determined for each ceramic used for the nozzle surface layer 23. .
- the characteristics of the arithmetic mean roughness Ra and the peak count PPI formed on the nozzle surface layer portion 23 differ depending on the processing method. Therefore, in order to satisfy the formula (1), it is necessary to appropriately control the processing conditions according to the processing method of the gas wiping nozzle. For example, cutting and blasting change Ra and PPI as described below, so it is necessary to appropriately select them when manufacturing a gas wiping nozzle.
- Cutting Increasing the cutting speed increases the PPI while keeping Ra constant. Increasing the cutting edge radius reduces Ra. If the Ra of the cutting edge is decreased, the PPI will increase.
- Blasting If the grain size of the blasting material is reduced, Ra and PPI are reduced. If the material of the projection material is softened, Ra and PPI are reduced.
- a gas wiping nozzle having such a configuration is arranged opposite to the continuous hot dip metal plating facility 100 in FIG. As a result, by blowing gas onto the steel strip pulled up from the molten metal bath, the amount of molten metal deposited on both sides of the steel strip can be adjusted, and the hot-dip metal plated steel strip can be produced continuously.
- the slit of the gas wiping nozzle has a length L1 of 1800 mm, a depth L2 of 20 mm, and a width L3 of 1.2 mm. Further, the molten zinc bath temperature was 460°C, and the gas temperature T at the tip of the gas wiping nozzle was 80°C.
- the material of the gas wiping nozzle was sialon, alumina, chromium molybdenum steel with a sialon coating of 80 ⁇ m, and chromium molybdenum steel was used as the material with a contact angle of less than 90 degrees.
- the linear mark occurrence rate was evaluated in each invention example and comparative example.
- the linear mark occurrence rate [%] is the ratio of the steel strip length determined to have linear mark defects in the inspection process to the length of the steel strip passed under each manufacturing condition. The presence or absence of linear mark defects was visually checked, and a linear mark generation rate of 0.5% or less was regarded as acceptable. Further, after the production was completed, the gas wiping nozzle was disassembled and visually inspected to confirm the presence or absence of surface flaws (nozzle flaws) on the gas wiping nozzle. Table 1 shows the results. In addition, "appropriate PPI range derived from Ra value" in Table 1 represents the range of peak count PPI that satisfies the relationship of formula (1) with respect to each arithmetic mean roughness Ra.
- invention examples 1-9 were able to significantly reduce the linear mark generation rate more than comparative examples 1-3. Further, no surface flaws were observed on the gas wiping nozzle under any conditions of Invention Examples 1 to 9, whereas flaws were observed in Comparative Example 1. This is probably because many linear mark defects occurred and the cleaning frequency of the gas wiping nozzle increased.
- the gas wiping nozzle and the method for manufacturing a hot-dip metal plated steel strip of the present invention it is possible to easily remove molten metal splash adhering to the gas wiping nozzle, and to obtain a beautiful steel plate free of linear mark defects. . Therefore, the hot-dip metal-plated steel strip can be produced with a high yield, and the industrial utility value is very large.
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Abstract
Description
PPI>c1×Ra+c2 (1)
PPI:ピークカウント(1インチ当たりの山の数)
Ra:算術平均粗さ[μm]
c1、c2:定数
上記知見に基づき完成された本発明の要旨は以下のとおりである。
[1]溶融金属浴から引き上げられた鋼帯にガスを吹き付けて、前記鋼帯の表面の溶融金属の付着量を調整するガスワイピングノズルにおいて、前記ガスワイピングノズルは、少なくともその表面がセラミックスで構成され、かつ該ガスワイピングノズルの表面粗度を示す指標である算術平均粗さRa及びピークカウントPPIが下記式(1)を満たす、ガスワイピングノズル。
PPI>c1×Ra+c2 (1)
PPI:ピークカウント(1インチ当たりの山の数)
Ra:算術平均粗さ[μm]
c1、c2:定数
[2]前記ガスワイピングノズルの材質がセラミックスである、[1]に記載のガスワイピングノズル。
[3]前記溶融金属浴に連続的に鋼帯を浸漬し、前記溶融金属浴から引き上げられる鋼帯を挟んで互いに対向して配置された、[1]又は[2]に記載のガスワイピングノズルから、前記鋼帯にガスを吹き付けて、該鋼帯の両面の溶融金属の付着量を調整して、連続的に溶融金属めっき鋼帯を製造する、溶融金属めっき鋼帯の製造方法。
[4][1]又は[2]に記載のガスワイピングノズルの製造方法であって、ガスワイピングノズル又はガスワイピングノズルの表面を構成する材質を選択する工程と、ガスワイピングノズルの表面の加工方法と加工条件を選択する工程と、を含み、該ガスワイピングノズルの表面粗度を示す指標である算術平均粗さRa及びピークカウントPPIが式(1)を満たすように、前記材質、及び/又は、前記加工方法と前記加工条件を選択する、ガスワイピングノズルの製造方法。
PPI>c1×Ra+c2 (1)
PPI:ピークカウント(1インチ当たりの山の数)
Ra:算術平均粗さ[μm]
c1、c2:定数
PPI>c1×Ra+c2 (1)
PPI:ピークカウント(1インチ当たりの山の数)
Ra:算術平均粗さ[μm]
c1、c2:定数
式(1)を満たさない場合には、ガスワイピングノズルから完全にスプラッシュを除去できず、溶融亜鉛めっき鋼板に線状マーク欠陥が発生してしまう。この式(1)を満たすためには、スプラッシュが接触するガスワイピングノズル表面の算術平均粗さRaやピークカウントPPIを制御する必要がある。
cosθw=rcosθe (2)
θw:粗化表面における見かけの接触角
θe:平滑表面に整地した液滴の接触角
r:平面に対する粗面の面積比(r≧1)
(2)式を基に、濡れ特性を模式的に表した図を図4に示す。図4は表面粗さが増加するにつれて、接触角がさらに増加する、換言すれば、濡れにくくなることを示している。
表面粗さの異なる試験片を溶融金属浴に所定時間浸漬した後、空冷で室温まで冷却した。実験前後の試験片重量の差分を浸漬面積で除算した値を亜鉛付着量[μg/m2]として記録し、以下の基準により判定を行った。
×:不合格:亜鉛付着量≧5.0μg/m2
〇:合格:亜鉛付着量<5.0μg/m2
実験条件:
試験片材質:サイアロン
試験片の寸法:縦50mm×横50mm×厚み3mm
試験片表面の算術平均粗さRa:0.01~5μm
試験片表面のピークカウントPPI:5~300
溶融金属種及び温度:亜鉛460℃
試験時間:30秒
実験結果を図5に示す。算術平均粗さRaの測定は、JIS B 0601-2001に則って測定した。Raの測定におけるカットオフ波長は0.8mmとした。ピークカウントPPIの測定は、SAE J911に則って測定した。PPIの測定におけるピークカウントレベルは0.635μmとした。図5から分かるように、RaおよびPPIの増加に伴い、亜鉛付着量が減少することが判明した。算術平均粗さRaは、セラミックス表面の粗さ曲線から得られる凹凸の平均的な高さを示す指標であり、算術平均粗さRaが大きいほどセラミックス表面の凹凸振幅が大きくなって、平滑面に対する粗面の面積率が増加する。一方、ピークカウントPPIは、セラミックス表面の粗さ曲線の1インチあたりの凸部の数を表す指標である。ピークカウントPPIが大きいほどセラミックス表面に短ピッチの凹凸が付与されることになるため、平滑面に対する粗面の面積率が増加することになる。したがって、Wenzelの式の通り、Ra及びPPIの増加に伴い平滑面に対する粗面の面積率が増加した結果、接触角が増加したため、亜鉛の付着量が減少した。換言すれば、濡れにくくなると推定される。なお、ここでは亜鉛を用いているが、他の金属、例えば、AlやCu等に対しても適用可能である。
PPI>c1×Ra+c2 (1)
PPI:ピークカウント(1インチ当たりの山の数)
Ra:算術平均粗さ[μm]
c1、c2:定数
なお、式(1)中の定数c1、c2の値は、ノズル表層部23に用いるセラミックスの材質によって変化するため、ガスワイピングノズルを製造する際には適宜求める必要がある。このc1、c2の算出方法は、以下のステップに沿って算出する。
ステップ1:ノズルの材質、溶融金属の成分を決める。これらの条件が異なる場合は、c1、c2の値に影響するため、その都度再測定を行う。なお、算術平均粗さRaおよびピークカウントPPIを付与するための加工方法は、任意に選択できる。例えば、研削加工(グラインダーによる切削加工方法)やブラスト加工(投射材と呼ばれる加工物に衝突させて、粗さを付与する加工方法)等が挙げられるが、これらに限定されるものではない。
ステップ2:Ra、PPIが異なるサンプルを10~20種用意する。なお、ワイピングノズルの加工精度の観点から、Raの上限は10μm以下、PPIの上限は500以下とするのが望ましい。
ステップ3:上述の実験を行い、図5に示すグラフをプロットする。
ステップ4:仮のc1’、c2’を決め、前記グラフにy=c1’x+c2’の線を引く。
ステップ5:実験結果のPPIとステップ4のグラフのyの差分の二乗の合計値(Y)を計算する。(Y=Σ(PPI-y)2)
ステップ6:c1’、c2’の値を5回変えてYを計算し、最もYが小さかった時のc1’、c2’をc1、c2とする。なお、各定数は重回帰で算出した定数である。
切削加工:
切削速度を速くすれば、Raは一定のまま、PPIが増加する。
切削刃先半径を大きくすれば、Raは減少する。
切削刃のRaを小さくすれば、PPIは増加する。
ブラスト加工:
投射材の粒径を小さくすれば、Ra、PPIは減少する。
投射材の材質を柔らかくすれば、Ra、PPIは減少する。
10 スナウト
12 めっき槽
14 溶融金属浴
16 シンクロール
18 サポートロール
20、20’ ガスワイピングノズル
21 上ノズル部材
22 下ノズル部材
23 ノズル表層部
24 噴射口(スリット)
25 中空部
26 ノズルヘッダ
27 ガス供給路
28 ガス供給管
29 溶融金属(スプラッシュ)
30 材質
θe、θw 接触角
L1 スリットの長さ
L2 スリットの奥行き
L3 スリットの幅
Claims (4)
- 溶融金属浴から引き上げられた鋼帯にガスを吹き付けて、前記鋼帯の表面の溶融金属の付着量を調整するガスワイピングノズルにおいて、前記ガスワイピングノズルは、少なくともその表面がセラミックスで構成され、かつ該ガスワイピングノズルの表面粗度を示す指標である算術平均粗さRa及びピークカウントPPIが式(1)を満たす、ガスワイピングノズル。
PPI>c1×Ra+c2 (1)
PPI:ピークカウント(1インチ当たりの山の数)
Ra:算術平均粗さ[μm]
c1、c2:定数 - 前記ガスワイピングノズルの材質がセラミックスである、請求項1に記載のガスワイピングノズル。
- 前記溶融金属浴に連続的に鋼帯を浸漬し、前記溶融金属浴から引き上げられる鋼帯を挟んで互いに対向して配置された、請求項1又は2に記載のガスワイピングノズルから、前記鋼帯にガスを吹き付けて、該鋼帯の両面の溶融金属の付着量を調整して、連続的に溶融金属めっき鋼帯を製造する、溶融金属めっき鋼帯の製造方法。
- 請求項1又は2に記載のガスワイピングノズルの製造方法であって、
ガスワイピングノズル又はガスワイピングノズルの表面を構成する材質を選択する工程と、
ガスワイピングノズルの表面の加工方法と加工条件を選択する工程と、を含み、
該ガスワイピングノズルの表面粗度を示す指標である算術平均粗さRa及びピークカウントPPIが式(1)を満たすように、前記材質、及び/又は、前記加工方法と前記加工条件を選択する、ガスワイピングノズルの製造方法。
PPI>c1×Ra+c2 (1)
PPI:ピークカウント(1インチ当たりの山の数)
Ra:算術平均粗さ[μm]
c1、c2:定数
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0617560B2 (ja) | 1986-06-19 | 1994-03-09 | 新日本製鐵株式会社 | 金属帯の表面処理におけるガスワイピングノズル |
JPH0827555A (ja) * | 1994-07-12 | 1996-01-30 | Nippon Steel Corp | 溶融金属めっき用スリットノズル |
KR20070117405A (ko) * | 2006-06-08 | 2007-12-12 | 주식회사 포스코 | 용융아연도금용 가스 와이핑 장치 |
JP2008190001A (ja) | 2007-02-06 | 2008-08-21 | Mitsubishi-Hitachi Metals Machinery Inc | ワイピングノズル |
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0617560B2 (ja) | 1986-06-19 | 1994-03-09 | 新日本製鐵株式会社 | 金属帯の表面処理におけるガスワイピングノズル |
JPH0827555A (ja) * | 1994-07-12 | 1996-01-30 | Nippon Steel Corp | 溶融金属めっき用スリットノズル |
KR20070117405A (ko) * | 2006-06-08 | 2007-12-12 | 주식회사 포스코 | 용융아연도금용 가스 와이핑 장치 |
JP2008190001A (ja) | 2007-02-06 | 2008-08-21 | Mitsubishi-Hitachi Metals Machinery Inc | ワイピングノズル |
Non-Patent Citations (1)
Title |
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REVIEW OF POLAROGRAPHY, vol. 54, no. 2, 2008 |
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