WO2017200134A1 - 표면 품질이 우수한 용융도금강판을 제조하기 위한 질소구름을 형성하기 위한 장치 및 이를 이용한 도금강판을 제조하는 방법 - Google Patents
표면 품질이 우수한 용융도금강판을 제조하기 위한 질소구름을 형성하기 위한 장치 및 이를 이용한 도금강판을 제조하는 방법 Download PDFInfo
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- WO2017200134A1 WO2017200134A1 PCT/KR2016/005617 KR2016005617W WO2017200134A1 WO 2017200134 A1 WO2017200134 A1 WO 2017200134A1 KR 2016005617 W KR2016005617 W KR 2016005617W WO 2017200134 A1 WO2017200134 A1 WO 2017200134A1
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- steel sheet
- strip
- plating bath
- weight
- plating
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 132
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 43
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 35
- 239000002184 metal Substances 0.000 title claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 title claims description 75
- 239000010959 steel Substances 0.000 title claims description 75
- 238000000034 method Methods 0.000 title claims description 23
- 238000004519 manufacturing process Methods 0.000 title claims description 18
- 238000007747 plating Methods 0.000 claims abstract description 127
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 46
- 239000007789 gas Substances 0.000 claims abstract description 33
- 230000007797 corrosion Effects 0.000 claims description 35
- 238000005260 corrosion Methods 0.000 claims description 35
- 239000011777 magnesium Substances 0.000 claims description 32
- 229910045601 alloy Inorganic materials 0.000 claims description 26
- 239000000956 alloy Substances 0.000 claims description 26
- 229910052749 magnesium Inorganic materials 0.000 claims description 25
- 229910052782 aluminium Inorganic materials 0.000 claims description 24
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 23
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 23
- 239000011651 chromium Substances 0.000 claims description 21
- 229910052804 chromium Inorganic materials 0.000 claims description 19
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 18
- 229910000611 Zinc aluminium Inorganic materials 0.000 claims description 16
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 claims description 16
- 229910052710 silicon Inorganic materials 0.000 claims description 16
- 229910052791 calcium Inorganic materials 0.000 claims description 14
- 239000011575 calcium Substances 0.000 claims description 14
- 239000010703 silicon Substances 0.000 claims description 14
- 239000011701 zinc Substances 0.000 claims description 14
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 13
- 229910052725 zinc Inorganic materials 0.000 claims description 13
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 12
- 239000010936 titanium Substances 0.000 claims description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 8
- 229910052719 titanium Inorganic materials 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 239000007921 spray Substances 0.000 abstract description 7
- 238000005507 spraying Methods 0.000 abstract description 4
- 230000000630 rising effect Effects 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 28
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 15
- 230000000694 effects Effects 0.000 description 14
- 239000012298 atmosphere Substances 0.000 description 13
- 230000001590 oxidative effect Effects 0.000 description 13
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 11
- 239000001301 oxygen Substances 0.000 description 11
- 229910052760 oxygen Inorganic materials 0.000 description 11
- 230000008021 deposition Effects 0.000 description 9
- 238000001816 cooling Methods 0.000 description 8
- 229910001335 Galvanized steel Inorganic materials 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 7
- 239000008397 galvanized steel Substances 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 239000012299 nitrogen atmosphere Substances 0.000 description 7
- 230000003647 oxidation Effects 0.000 description 7
- 238000007254 oxidation reaction Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 230000005499 meniscus Effects 0.000 description 3
- 229910019018 Mg 2 Si Inorganic materials 0.000 description 2
- 229910017706 MgZn Inorganic materials 0.000 description 2
- 229910007570 Zn-Al Inorganic materials 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 229910000905 alloy phase Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000002845 discoloration Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910018134 Al-Mg Inorganic materials 0.000 description 1
- 229910021365 Al-Mg-Si alloy Inorganic materials 0.000 description 1
- 229910018137 Al-Zn Inorganic materials 0.000 description 1
- 229910018467 Al—Mg Inorganic materials 0.000 description 1
- 229910018573 Al—Zn Inorganic materials 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 229910019752 Mg2Si Inorganic materials 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 229910008458 Si—Cr Inorganic materials 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical class [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000003287 bathing Methods 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- -1 for example Substances 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
-
- 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
-
- 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
-
- 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
- C23C2/12—Aluminium or alloys based thereon
-
- 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
- C23C2/325—Processes or devices for cleaning the 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
- C23C2/34—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 relates to an apparatus for forming a nitrogen cloud (sheet) for producing a hot-dip galvanized steel sheet and a method for manufacturing a plated steel sheet using the same, and more specifically to a metal such as zinc or aluminum
- the present invention relates to a device for efficiently forming a non-oxidizing atmosphere in order to block a plated steel sheet from outside air in an apparatus for hot-dip plating, and a method of manufacturing a plated steel sheet using the same.
- Hot-Dip Metal Coated Steel Sheet is widely used as part of securing corrosion resistance of steel sheet.
- the typical galvanized steel sheet (GI) is widely used on the basis of economical efficiency and abundant resources, and is one of the most used galvanized steel sheets.
- GI galvanized steel sheet
- Al-Zn aka Galvalume
- the aluminum plated steel sheet has excellent corrosion resistance and heat resistance compared to galvanized steel sheet, and is widely applied to automobile mufflers, home appliances, and heat resistant materials.
- an aluminum steel sheet containing Ti in iron of Japanese Patent Laid-Open No. 57-47861 an aluminum plated steel sheet containing C, Si, Cu, Ni and a small amount of Cr in iron of Japanese Patent Laid-Open No. 63-184043, of Japanese Patent Laid-Open No. 60-243258
- Si of 10% or less is added to the aluminum plating bath. Since the plated steel sheet produced by this method is relatively excellent in workability and heat resistance, it is widely used in heat-resistant parts such as mufflers, water heaters, heaters, rice cookers, and the like of automobiles.
- the silicon added to suppress the formation of the alloy layer in some cases, rather than damage the surface appearance of the plated steel sheet has a problem that has a clear appearance
- the damage of the surface appearance by the addition of silicon is a small amount of magnesium It is known to solve to some extent by addition.
- Zn-Al alloy plated steel sheet As described above, there is a disadvantage that the cut processing does not exhibit sufficient corrosion resistance. This phenomenon is due to the deterioration of the corrosion resistance due to the reduction of the sacrificial anti-corrosive zinc that the surface exposed to the cut end portion prevents corrosion of iron due to the zinc-aluminum alloy layer.
- Zn-Al alloy plated steel sheet has a disadvantage in that the plating layer is formed in a form that does not have a heterogeneous alloy phase, so that the interface is weak at the time of use after bending processing or drawing processing, thereby deteriorating corrosion resistance after processing.
- Hot-dip galvanized steel sheet depends not only on the composition of the plating bath, but also on the technique of controlling the surface of the steel sheet coming out of the plating bath.
- the components of the hot dip layer for example, Zn, Al, Mg, etc., combine with oxygen in the air to form an oxide film, which is a factor of lowering the surface quality of the plated steel sheet.
- a plated steel sheet product in which Mg is added to the plating bath is more problematic in appearance quality of the surface than in the case of general GI and GL plating baths, which is a problem caused by oxidative properties of Mg elements.
- Mg is a highly oxidizing element, and the oxidation reactivity is particularly high in a high temperature plating bath, which causes oxides or Mg fine oxides bound to other elements to be squeezed onto the strip, causing problems of deterioration of the surface of the plated steel sheet.
- the strip deposited on the molten metal from the plating bath (pot) is exposed to the air, and a method of plating a non-oxidizing atmosphere to prevent oxidation in a section where cooling is performed and a device therefor are well known.
- a method of plating a non-oxidizing atmosphere to prevent oxidation in a section where cooling is performed and a device therefor are well known.
- the conventional method or apparatus has various problems.
- each plating bath is 460 °C (general zinc-aluminum plated bath) and 600 °C (galvalume steel plate bath) 650 °C (aluminum plated bath) due to the sealed box shape. As a result, the hot heat inside is not properly released into the atmosphere and the temperature inside the box / vessel is raised.
- a cooling device In order to prevent this problem, a cooling device must be separately configured to prevent the temperature rise of various electric devices. It also reduces the lifetime of various electrical devices.
- the purpose of forming a non-oxidizing atmosphere by injecting nitrogen gas is to prevent oxidation on the surface of plating molten metal and to prevent the generated oxide from adsorbing to Strip.
- surface oxide generated on the surface of molten metal (Top Dross) is not easy to remove
- Air Knife is a method of filling by using injected nitrogen for plating deposition control and supplying from other supply line from outside.
- the amount of nitrogen injected from the continuous zinc plating line Air Knife is usually 3000 ⁇ 6000m3 / hr, which is not enough to fill the box type oxygen with nitrogen, and as mentioned earlier, Nitrogen gas should be additionally supplied from outside. To this end, 3000 ⁇ 4000m3 / hr of nitrogen should be supplied in addition to the nitrogen supplied from Air Knife. Works.
- the present invention has been made in view of the above point, and an object of the present invention is to provide an apparatus for forming a non-oxidizing atmosphere in the steel sheet coming from the surface of the plating bath in the production of hot-dip steel sheet.
- Another object of the present invention is to provide a method for producing a plated steel sheet excellent in surface appearance and corrosion resistance.
- the present invention is installed between the plating bath surface for hot-dip plating and the air knife facility for controlling the thickness of the plating metal attached to the surface of the strip circumference of the strip rising from the plating bath It is achieved by providing an apparatus for forming a nitrogen cloud (membrane) in the.
- the apparatus of the present invention the slit through which the strip passes through a spaced apart from the surface of the plating bath, having a semi-cylindrical body, the bottom of which is open toward the plating bath surface, the upper surface of the body And a lower gas discharge part is formed around the lower end of the body to inject nitrogen gas toward the plating bath surface to block external air, and crosses the bottom of the body in the width direction of the strip. It is disposed on both sides of the inner gas discharge unit for injecting nitrogen gas toward the strip, the inside of the body is characterized in that a plurality of injection nozzles for injecting nitrogen gas toward the strip is formed.
- the present invention provides a method of manufacturing a zinc-aluminum alloy plated steel sheet using the apparatus.
- the zinc-aluminum alloy plated steel sheet is 35 to 55% by weight of zinc, 0.5 to 3% by weight of silicon, 0.005 to 1.0% by weight of chromium, 0.01 to 3.0% by weight of magnesium, and 0.001 to 0.1% by weight of titanium. It is characterized by producing a zinc-aluminum alloy plated steel sheet excellent in workability and corrosion resistance by plating in the plating bath containing aluminum and inevitable impurities. According to this, the produced plated steel sheet has excellent surface appearance and corrosion resistance.
- the plating bath may further include 1 to 10% by weight of calcium based on the total weight of magnesium.
- the apparatus of the present invention there is an effect of forming a nitrogen cloud (veil) around the steel sheet exiting the plating bath to prevent contact with external air before the steel sheet (strip) reaches the air knife facility.
- the apparatus of the present invention is to inject the nitrogen gas into the inside of the body to fill the inside of the body with nitrogen gas as a whole, the bottom opening of the body through the lower gas discharge portion formed in the bottom of the body to block the nitrogen gas from the outside air And injecting nitrogen gas toward the strip through the inner gas discharge portion at both sides of the strip rising from the surface of the plating bath, to block the plating metal attached to the strip from the outside air from the moment of exiting the surface of the plating bath. Doing.
- the apparatus of the present invention may further form an upper gas discharge portion for injecting nitrogen gas in the direction of the strip passing through the slit on both sides of the slit.
- the outside air containing oxygen is prevented from entering the inside of the body through the slit.
- the inner gas discharge part may include a circular pipe body in which a plurality of nozzles for discharging nitrogen gas are formed at regular intervals in a longitudinal direction, and a housing in which a concave groove is formed in the longitudinal direction to accommodate one side surface of the pipe body, and the pipe body. Corresponding grooves are formed to include a fixed block to allow the pipe body to be seated at both ends of the pipe body, the pipe body and the housing may be formed with one or more passages through which nitrogen gas moves.
- the present invention has the effect of improving the quality of the hot-dip galvanized steel sheet by preventing the contact with the outside air before the steel sheet exiting the plating bath passes through the air knife.
- Figure 3 is a perspective view of the body portion according to an embodiment of the present invention.
- Figure 4 is an enlarged partial view of the body portion in another embodiment of the present invention.
- FIG. 5 is a perspective view of a body portion according to another embodiment of the present invention.
- Figure 6 is a perspective view of the inner gas discharge unit in another embodiment of the present invention.
- Figure 7 is an exploded perspective view of the inner gas discharge unit according to another embodiment of the present invention.
- FIG. 8 is a cross-sectional view taken along line AA ′ of FIG. 6.
- Figure 9 is a bottom view of the body portion according to another embodiment of the present invention.
- the device of the present invention is spaced a certain distance from the plating bath surface 10, it is located below the air knife facility (2) .
- the device of the invention has a body 3.
- the body portion 3 is a semi-cylindrical dome shape, the upper surface is formed with a slit 32 through which the plated strip 100 passes in the longitudinal direction of the body portion (3).
- the slit 32 is formed larger than the thickness and width of the strip (100).
- Body portion 3 may be made of iron plate.
- the bottom of this body part 3 is open toward the surface 10 of the plating bath.
- a bottom gas discharge portion 33 for injecting nitrogen gas toward the surface 10 of the plating bath is formed at the bottom edge of the body 3.
- the lower gas discharge part 33 is similar to a device called an air curtain, and sprays compressed nitrogen gas downward through a slit 33a (see FIG. 9) to form an air film (air curtain) to form the lower gas discharge part.
- the inside and outside of (33) are isolated from outside air.
- the apparatus of the present invention comprises a plurality of nozzles 34 for injecting nitrogen gas into the body 3.
- the nozzles 34 form nitrogen clouds S in the body 3 by injecting nitrogen gas toward the center of the body 3.
- the apparatus of the present invention crosses the bottom surface of the body 3 in the width direction of the strip 100, the inner side is disposed opposite to both sides of the strip 100 to inject nitrogen gas toward the strip 100 It includes a gas discharge portion 31.
- Nitrogen gas is injected from the moment when the strip 100 emerges from the surface 10 of the plating bath, thereby preventing oxygen from affecting the surface of the strip 100. It also has the effect of discharging the heat emitted from the strip 100 to the outside of the device. That is, since the apparatus of the present invention is spaced apart from the plating bath surface 10, and the lower surface is open, the strips are formed by the nitrogen gas injected from the nozzle 34 and the inner gas discharge part 31. 100) and the heat emitted from the molten metal 1 can be easily discharged to the outside.
- forming a non-oxidizing atmosphere by injecting nitrogen into the steel sheet exiting the plating bath is a known technique (D1 to D6) as described above.
- a closed space such as a box
- the heat of the molten metal is not discharged to the outside, so that the internal machinery and various Damage and malfunction of the sensor will occur.
- the apparatus since a closed space must be opened for the periodic removal of oxides generated on the surface of the plating bath, the apparatus has a disadvantage in that the operation of the apparatus is stopped or the quality is deteriorated by the inflow of external air.
- the apparatus of the present invention is installed at the bottom of the air knife facility 2 that controls the amount of plated metal attached to the strip 100.
- the inner gas discharge unit 31 is directly covered with a steel plate in a state surrounded by a dome-shaped body 3 and blocked outside air by nitrogen injected from the lower gas discharge unit 33 formed at the lower edge of the body 3. Injecting nitrogen in the direction (100) and the remaining space is filled with nitrogen discharged from the injection nozzle 34 to form a space (S) in which a non-oxidizing atmosphere formed by nitrogen is formed as shown in FIG. will be.
- the apparatus of the present invention is spaced apart from the surface 10 of the plating bath by a certain distance, it is easy to insert the equipment to remove the molten surface oxide by manpower or the apparatus, and nitrogen is continuously sprayed during the removal operation. This has the advantage of not stopping.
- the molten metal surface oxide formed on the surface of the molten metal could not be prevented from adhering to the steel sheet or forming a fine oxide film by magnesium.
- Nitrogen is injected from the inclined downward direction in the direction of the steel sheet 100 to force the surface oxide of the molten metal pushed out of the steel sheet 100, the molten surface oxide is buried in the steel sheet 100 or fine oxidation It is possible to suppress the occurrence of the film more efficiently.
- reference numeral 50 denotes a meniscus formed by molten metal attached to both surfaces of the steel sheet 100 and drawn up from the surface of the plating bath, and the amount of molten metal contained in the meniscus is the steel sheet 100. It becomes the thickness of the plated metal attached to the, it is controlled by the moving speed of the steel sheet, the pressure of nitrogen gas injected from the air knife (2).
- the inner gas discharge part 31 serves to physically remove the Dross generated from the meniscus outermost surface so as not to adhere to the plated steel sheet or suppress the oxidizing atmosphere in which the Dross occurs.
- FIGS. 4 to 5 show an apparatus according to another embodiment of the present invention.
- a pair of upper gas discharge parts 35 for injecting nitrogen gas in the direction of the slit 32 from both sides of the slit 32 formed on the upper surface of the body 3 of the apparatus of the present invention are additionally formed.
- the nitrogen gas injected at such a strong pressure is mixed with the outside air to vortex It can also form.
- Such vortices may enter the inside of the body 3 through the slit 32, and in order to prevent this, an upper gas discharge part 35 is formed above the slit 32 to inject nitrogen gas therefrom. It is to prevent the oxygen mixed in the vortex from entering the body 3 through the slit 32.
- the inner gas discharge part 31 may have a circular pipe main body 31a and one side surface of the pipe main body 31a in which a plurality of nozzles 311 for discharging nitrogen gas are formed at regular intervals in the longitudinal direction.
- a housing 31b having a concave groove 314 formed in the longitudinal direction and a recess 330 corresponding to the pipe main body 31a are formed to accommodate the pipe main body 31a at both ends of the pipe main body 31a. It includes a fixed block (31c) to be.
- one or more nitrogen supply holes 315 and 312 are provided in the pipe main body 31a and the housing 31b to provide a passage for supplying nitrogen gas.
- the housing 31b, the pipe body 31a and the fixing block 31c are fixed by fixing bolts 318 passing through the screw holes 316 and 317.
- caps 313 having an outer diameter larger than the outer diameter of the pipe main body 31a are formed at both ends of the pipe main body 31a.
- the operator can loosen the fixing bolt 318, grab the cap 313 to rotate the pipe body 31a by a predetermined angle.
- a plurality of nozzles 311 are formed on the pipe main body 31a, but nitrogen gas may be discharged through the slits long cut like the air curtain.
- FIG. 9 exemplarily illustrates a state in which the inner gas discharge part 31 having a slit shape is formed in the body 3.
- FIG. 9 is a view seen from the bottom of the body 3, in which an inner gas discharge part 31 having a slit 33f for ejecting nitrogen gas is fixed to the body 3 by a support bridge 39.
- the device of the present invention forms a nitrogen barrier in only a portion of the bottom of the air knife, there is no spangle minimizing interference element due to the deformation of the structure due to the latent heat generated in the conventional Box Type and the decrease in cooling capacity after plating.
- the device of the present invention is not a box type like a conventional device that covers the entire air knife that controls the coating amount from the surface of the molten metal, but the lower section of the air knife where oxidation occurs or the dross can be adsorbed onto the strip. It forms a nitrogen curtain (nitrogen film) using a nozzle to form nitrogen DAM. It is not a method of filling nitrogen into the enclosed space, but by injecting nitrogen into the upper and lower portions of the lower section of the air knife to form a nitrogen barrier (S) and maintaining the inside in a nitrogen atmosphere, so that the gas flows smoothly from the inside to the outside of the device. Do not keep.
- the nitrogenous membrane (S) of the present invention is formed only in a part of the bottom of the air knife as can be seen in the drawing, it does not affect any structure (parts) other than the surface of the molten metal plating and the plating is in progress. Therefore, there is a low possibility of error caused by heat of electric devices for driving air knife such as structure deformation and various sensors and motors due to heat generated in the conventional Box Type.
- the device of the present invention is not directly contacted or deposited with the surface of the molten metal, but is spaced a certain distance from the surface of the molten metal, so that there is no obstacle when removing Dross by using a manpower or a robot through this space.
- it is effective to maintain nitrogen atmosphere because it always maintains the curtain of nitrogen curtain type sprayed through the nozzle even when the device or tool is inserted in the space to remove Top Dross.
- the present invention includes the effect of physically preventing the adsorption of the Top Dross and the fine oxide film on the Strip while forming a nitrogen atmosphere to suppress the Top Oxide and the fine oxide film on the upper surface of the molten metal.
- the present invention forms a nitrogen barrier in the lateral direction of the plating bath when nitrogen is injected downward from the lower nitrogen gas discharge unit 33 (see FIG. 1). It physically prevents the movement to the vicinity of the strip, so that it does not adsorb on the strip.
- the present invention having the effect of preventing adsorption on the strip after plating at the same time as forming the nitrogen atmosphere is different from the conventional apparatus for suppressing the oxide by forming only the existing nitrogen atmosphere.
- the device of the present invention forms a nitrogen atmosphere only for a part of the space required at the bottom of the air knife, even with a small amount of nitrogen emitted from the lower nitrogen gas discharge unit 33, the nitrogen membrane can be maintained and maintained at a pressure higher than normal pressure. It is more efficient than the conventional box type that supplies nitrogen.
- the present invention can also reduce the nitrogen usage.
- the present invention is a production method that can exhibit a more effective oxide production inhibitory, adsorption prevention effect than the conventional method.
- the present invention using the above device, zinc-aluminum alloy plated steel sheet 35 to 55% by weight of zinc, 0.5 to 3% by weight of silicon, 0.005 to 1.0% by weight of chromium, 0.01 to 3.0% by weight of magnesium, 0.001 to Provided is a method for producing a zinc-aluminum alloy plated steel sheet excellent in workability and corrosion resistance by plating in the plating bath containing 0.1% by weight, the remainder of which is aluminum and inevitably contained impurities.
- the present invention is a zinc-aluminum-based alloy plated steel plate to be plated in the plating bath having the plating composition as described above in a portion spaced apart from the surface of the plating bath, and at the bottom of the air knife installation, by forming a nitrogen dam on the surface of the plating bath The fine oxide film produced in contact with oxygen is prevented from adsorbing to the steel sheet.
- the plating bath comprises 35 to 55% by weight of zinc.
- Zinc has a sacrificial anticorrosive property than base iron to prevent corrosion. It is necessary to secure more than 35% by weight. If it is less than this, the plating bath fluidity and corrosion resistance are lowered, and if it is abnormal, the temperature of the plating bath must be increased, resulting in an operational problem with an increase in the top dross. This becomes bad.
- the cost is increased due to the increase in the aluminum ratio of the plated steel sheet, thereby lowering the economic efficiency.
- the plating bath of the present invention contains 0.5 to 3.0% by weight of silicon.
- Silicon has the effect of imparting gloss by improving the fluidity of the plating bath with the purpose of suppressing the growth of the alloy layer, and the amount of addition should be added at least 0.5% by weight. This is an important role of silicon in the plating layer to control the alloy layer formation of the base steel sheet and aluminum, if the addition amount is 0.5% by weight or less, the function is limited and the workability is significantly reduced.
- the addition of more than 3% by weight of the Mg2Si phase acts as a contributing factor to the improvement of the corrosion resistance of the coating layer, resulting in excessive surface roughness and surface discoloration, premature surface discoloration and post-treatment coating properties appear to be inhibited do. Therefore, it is preferable to make the addition amount of silicone into 0.5 to 3 weight%.
- Chromium added to the plating bath forms a dense passivated oxide film on the surface of the plating layer to improve the corrosion resistance of the aluminum plated steel sheet and to form a uniform distribution of chromium elements in the plating bath, thereby miniaturizing the grains of the plating layer. .
- a band of Al-Zn-Si-Cr mixture of a certain type integrated in the plating layer (Fig. 2) and the chromium component in the plating layer reacts with aluminum to form an AlCr2 phase. It acts to improve corrosion resistance.
- the role of chromium is controlled to 3% by weight or less of the silicon content to act as a factor that controls the excessive precipitation in the form of acicular shape of the silicon component in the plating layer.
- the content of chromium having such an effect should be added at least 0.1.
- the content of chromium is 0.005 to 1.0% by weight. If the content of chromium is less than 0.005% by weight, there is little effect of uniform distribution in the plating bath. If the content of chromium is more than 1.0% by weight, the temperature of the plating bath is required to increase as the content of chromium increases. (dross) is increased, there is a problem that the dross is attached to the plated steel sheet surface damage appearance. Therefore, it is preferable that the addition amount of chromium is 0.005 to 1.0 weight%.
- the plating bath of the present invention also contains 0.01 to 3.0% by weight of magnesium.
- Magnesium added with the chromium combines with oxygen in the air in contact with the plating layer to form a passivation film to prevent the diffusion of oxygen into the alloy layer and to prevent further corrosion to improve corrosion resistance.
- the presence of the Mg 2 Si phase (see FIGS. 1 and 2) formed by the reaction of magnesium and silicon in the plating layer and the MgZn 2 phase formed by the reaction of magnesium and zinc are corroded by formation of a local battery along with the sacrificial corrosion resistance of zinc in the course of corrosion. It is to reduce the speed.
- the amount of magnesium added is less than 0.01% by weight, the effect of improving corrosion resistance due to dispersion and oxidation characteristics is small. If the amount of magnesium exceeds 3.0% by weight, the plating bath is saturated and the melting point is increased. As a result of deterioration of surface quality, the production process increases with the increase of manufacturing cost.
- the addition amount of magnesium is 0.01 to 3.0 weight%.
- the plating bath of the present invention also contains calcium 1 to 10% by weight of magnesium.
- the calcium added together with the magnesium and chromium prevents the phenomenon of inhibiting the production of magnesium oxide generated at the surface of the molten metal by causing the magnesium microoxide film to adhere to the surface of the plated steel sheet to inhibit the appearance quality.
- the mechanism of the method of suppressing the oxidizing power of the molten metal by adding calcium is that the ignition temperature of the Mg molten metal increases by 200 ° C or more due to the addition of calcium.
- An increase in the ignition temperature of the Mg alloy due to the addition of calcium generally forms an oxide layer formed on the surface. It is possible to effectively block the inflow of oxygen by changing from the porous oxide layer to the dense oxide layer.
- the amount of calcium added is less than 1% by weight of magnesium, the dispersibility is low, and the inhibitory effect of the MgO oxide film is less, and when the amount of calcium exceeds 10% by weight of magnesium, the plating layer is formed by the intermetallic compound generation of aluminum and calcium. It may cause deterioration of processability. Therefore, the amount of calcium added is preferably 1 to 10% by weight of the magnesium weight ratio.
- 0.001 to 0.1 weight% of titanium is included in order to refine
- the present invention is based on miniaturizing a spangle by adding chromium, magnesium, calcium, and titanium to a plating bath containing aluminum, zinc, and silicon, which are conventional galvalume-plated steel, in an appropriate composition at the same time, thereby creating many opportunities for nucleation. do.
- the added components are dispersed in the plating layer after the steel plate is plated in the molten metal to form a myriad of nuclei such as Mg 2 Si phase, MgZn 2 phase, AlCr 2 phase, and the like to interfere with each other between grain boundaries during the solidification of the plating material.
- nuclei such as Mg 2 Si phase, MgZn 2 phase, AlCr 2 phase, and the like to interfere with each other between grain boundaries during the solidification of the plating material.
- the temperature of the steel plate at the time of bathing in a molten plating bath to 570-650 degreeC, and the molten metal temperature to 550-650 degreeC.
- the bath temperature of the steel sheet is 550 °C or less, the fluidity of the plating bath is reduced, and the appearance of the plating film is poor, and coating adhesion is degraded.
- the temperature is over 650 °C, thermal diffusion of the steel sheet is accelerated, resulting in abnormal growth of the alloy layer. This is because the workability is deteriorated and at the same time, a problem of excessive generation of the Fe oxide layer in the molten metal occurs.
- the plating deposition amount is set on the basis of one side of 20 ⁇ 100g / m2. If the plating deposition amount is below 20g / m2, the air pressure of the air knife equipment that controls the deposition amount is excessively increased, which causes variation in plating deposition amount. Along with this, the rapid increase in surface oxides in the melt results in damage to the appearance of the coating and deposition of oxide dross.
- a stripped cold rolled steel sheet having a thickness of 0.8 mm, a width of 120 mm, and a length of 250 mm was plated using the apparatus according to claim 3 of the present invention.
- Table 1 shows the evaluation results based on the single-side plating adhesion amount of the manufactured zinc-aluminum alloy plated steel sheet.
- Corrosion resistance and processability were evaluated. Corrosion resistance was compared with 5% according to KSD 9504 test method and evaluated at initial red blue development time (5%) in 35 °C NaCl salt spray test atmosphere. According to the 180 ⁇ OT bending test, the width of the crack (the width of the fracture surface) generated after observing with a stereo microscope of 30 to 50 magnification was measured to measure the width of the fracture surface. Comparative evaluation. Observation of the alloy phase using an X-ray diffraction (XRD) equipment.
- XRD X-ray diffraction
- Degree of dross generation The result of measuring the amount of dross generated on the upper part of the plating bath after the preparation of the molten plating specimen by the plating composition.
- Shear surface corrosion resistance The degree of red blue color development after 1,000 hours of salt spray test was evaluated.
- Corrosion resistance of plate The degree of red blue color development after 2,500 hours of salt spray test was evaluated.
- the amount of dross generated in the case of plating using the apparatus according to the present invention is small, and also the workability and corrosion resistance of the steel sheet plated according to the invention example are excellent. That is, in the case of the invention example, even after the 180 ° OT bending test was performed (cracked surface) was determined to be 10 ⁇ 20 ⁇ m superior to the case of the comparative example, also in the corrosion resistance even in the case of the invention example, in the flat end red blue plating amount At 50g / m 2 on one side, more than 3,000 hours and the red-blue shear part is more than 1000 hours, which is much better than the existing composition. As a result of visual observation, it was shown that the surface appearance of the production example to which the apparatus of the present invention was applied was better than that of the comparative example. This is a result of the miniaturization of the sequin size.
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- Engineering & Computer Science (AREA)
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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ES201890066A ES2725126B1 (es) | 2016-05-17 | 2016-05-27 | Aparato para formar una nube de nitrogeno para fabricar una chapa de acero recubierta por inmersion en caliente con una calidad de la superficie excelente y metodo para fabricar una chapa de acero recubierta por inmersion en caliente de cinc y aluminio utilizando el mismo aparato. |
NZ721156A NZ721156A (en) | 2016-05-17 | 2016-05-27 | Apparatus for forming nitrogen cloud to produce hot-dip coated steel sheet with excelent surface quality and method for producing zinc-aluminum hot-dip coated steel sheet using the same |
GB1817297.3A GB2564365B (en) | 2016-05-17 | 2016-05-27 | Apparatus for forming nitrogen cloud to produce hot-dip coated steel sheet with excelent surface quality and method for producing zinc-aluminium hot-dip coate |
DE112016006868.9T DE112016006868B4 (de) | 2016-05-17 | 2016-05-27 | Vorrichtung zum Bilden einer Stickstoffwolke zur Herstellung eines schmelztauchbeschichteten Stahlblechs mit hervorragender Oberflächenqualität und Verfahren zur Herstellung eines mit Zink-Aluminium schmelztauchbeschichteten Stahlblechs unter Verwendung desselben |
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KR10-2016-0060100 | 2016-05-17 | ||
KR1020160060100A KR101758717B1 (ko) | 2016-05-17 | 2016-05-17 | 표면 품질이 우수한 용융도금강판을 제조하기 위한 질소구름을 형성하기 위한 장치 및 이를 이용한 아연-알루미늄합금도금강판을 제조하는 방법 |
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PCT/KR2016/005617 WO2017200134A1 (ko) | 2016-05-17 | 2016-05-27 | 표면 품질이 우수한 용융도금강판을 제조하기 위한 질소구름을 형성하기 위한 장치 및 이를 이용한 도금강판을 제조하는 방법 |
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KR (1) | KR101758717B1 (es) |
DE (1) | DE112016006868B4 (es) |
ES (1) | ES2725126B1 (es) |
GB (1) | GB2564365B (es) |
NZ (1) | NZ721156A (es) |
WO (1) | WO2017200134A1 (es) |
Cited By (1)
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CN115354257A (zh) * | 2022-08-30 | 2022-11-18 | 武汉钢铁有限公司 | 一种气刀 |
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KR101944963B1 (ko) | 2018-01-15 | 2019-02-07 | (주)탑스 | 기판 도금 장치용 고정지그 |
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GB2564365B (en) | 2021-11-03 |
GB2564365A (en) | 2019-01-09 |
NZ721156A (en) | 2019-06-28 |
DE112016006868B4 (de) | 2022-10-20 |
KR101758717B1 (ko) | 2017-07-18 |
DE112016006868T5 (de) | 2019-03-07 |
GB201817297D0 (en) | 2018-12-05 |
ES2725126R1 (es) | 2019-09-27 |
ES2725126B1 (es) | 2020-07-17 |
ES2725126A2 (es) | 2019-09-19 |
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