KR20000045528A - Method of producing mini spangle melt-coated steel plate having excellent surface appearance - Google Patents
Method of producing mini spangle melt-coated steel plate having excellent surface appearance Download PDFInfo
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- KR20000045528A KR20000045528A KR1019980062087A KR19980062087A KR20000045528A KR 20000045528 A KR20000045528 A KR 20000045528A KR 1019980062087 A KR1019980062087 A KR 1019980062087A KR 19980062087 A KR19980062087 A KR 19980062087A KR 20000045528 A KR20000045528 A KR 20000045528A
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- South Korea
- Prior art keywords
- steel sheet
- steel plate
- aqueous solution
- high voltage
- spangle
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 45
- 239000010959 steel Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000007864 aqueous solution Substances 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 230000005684 electric field Effects 0.000 claims abstract description 11
- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 238000007747 plating Methods 0.000 claims description 26
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 22
- 239000008397 galvanized steel Substances 0.000 claims description 22
- 238000004519 manufacturing process Methods 0.000 claims description 16
- 238000005507 spraying Methods 0.000 claims description 10
- 239000007921 spray Substances 0.000 abstract description 18
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 6
- 239000011701 zinc Substances 0.000 description 6
- 229910052725 zinc Inorganic materials 0.000 description 6
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/005—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means the high voltage supplied to an electrostatic spraying apparatus being adjustable during spraying operation, e.g. for modifying spray width, droplet size
-
- 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
- C23C2/26—After-treatment
Abstract
Description
본 발명은 표면 외관이 우수한 미니 스팡글 용융도금강판 제조 방법에 관한 것으로, 보다 상세하게는 도금층이 에어와이핑되어 도금 부착량이 조정된후 미응고된 도금층에 물 혹은 수용액을 분사하여 도금층을 응고시킬 때 정전기적 인력을 적용시켜 도금층을 균일하고 신속하게 응고시킴으로써 표면 외관이 우수한 미니 스팡글 용융도금강판을 제조하는 방법에 관한 것이다.The present invention relates to a method for producing a mini-spangle hot-dip galvanized steel sheet having an excellent surface appearance, and more particularly, after the plating layer is air wiped to adjust the coating amount, the water is sprayed onto the unsolidified plating layer to solidify the plating layer. The present invention relates to a method for producing a mini-spangle hot-dip galvanized steel sheet having excellent surface appearance by applying an electrostatic attraction when solidifying the plating layer uniformly and quickly.
용융아연도금강판에서는 통상 표면에 큰 아연 결정(스팡글:Spangle)이 형성되어 도장후 강판 외관에 악영향을 미친다.In hot-dip galvanized steel sheets, large zinc crystals (spangles) are usually formed on the surface, which adversely affects the appearance of the steel sheet after coating.
그래서 이 스팡글을 소실시키기 위하여 여러 가지 방법이 제안되었는데, 첫째로, 저 Pb 농도를 갖는 도금욕을 사용하는 방법이 있으며, 둘째로, 도금후에 스킨 패스 압연을 실시하는 방법, 셋째로, 아연 도금층의 응고 직전에 물 또는 수용액을 분사하는 방법등이 이용되고 있다.Therefore, various methods have been proposed to dissipate this spangle. Firstly, there is a method of using a plating bath having a low Pb concentration, and secondly, a method of performing skin pass rolling after plating, and thirdly, a zinc plating layer. A method of spraying water or an aqueous solution immediately before solidification is used.
그러나, 저 Pb 농도를 갖는 도금욕을 사용하는 방법은 아연욕조의 유동성이 감소하여 작업이 어려운 문제점이 있으며, 또한 이러한 조성의 도금욕에서는 스팡글이 있는 레귤러 스팡글(Regular Spangle) 용융도금강판을 제조하는 것이 곤란하여 생산가능한 제품이 미니 스팡글 용융도금강판으로 제한되는 문제가 있다.However, the method of using a plating bath having a low Pb concentration has a problem that it is difficult to work due to the reduced fluidity of the zinc bath, and also in the plating bath having such a composition, a regular spangle hot-dip galvanized steel sheet with spangles is used. Difficult to manufacture, there is a problem that the product that can be produced is limited to mini-spangle hot-dip steel sheet.
또한, 두 번째의 스킨패스 압연을 실시하는 방법에서는 완전히 스팡글을 제거하는 것이 불가능하다.In addition, in the method of performing the second skin pass rolling, it is impossible to completely remove the spangle.
따라서, 현재는 아연도금층의 응고 직전에 물 또는 수용액을 분사하는 방법이 많이 이용되며, 수용액으로는 중인산염 수용액이 주로 사용된다.Therefore, at present, a method of spraying water or an aqueous solution immediately before the solidification of the galvanized layer is widely used, and an aqueous solution of heavy acid salt is mainly used as the aqueous solution.
그러나, 중인산염 수용액 분사법에서는 용액 분사 시기의 선정이 매우 중요하며, 선정이 조금이라도 잘못되면 불균일한 스팡글이 형성되는 문제점이 있다.However, the selection of the solution injection timing is very important in the heavy salt aqueous solution spray method, there is a problem that non-uniform spangles are formed if the selection is a little wrong.
즉, 강판의 온도가 높을 때 분사하면 도금층이 용융아연 상태이므로 수용액의 분사궤적이 도금층에 나타나는 문제가 있으며, 이를 해결하기 위하여 응고 직전에 수용액을 분사하는 것이 중요한 데, 약간이라도 분사 시기가 늦을 경우에는 스팡글리 불균일하게 형성되어 표면 외관이 불량해지는 문제가 있다.That is, when spraying when the temperature of the steel sheet is high, the plating layer is in the molten zinc state, so there is a problem in that the spray traces of the aqueous solution appear in the plating layer. In order to solve this problem, it is important to spray the aqueous solution immediately before solidification. There is a problem that the spangles are unevenly formed and the surface appearance is poor.
특히, 수용액 분사방법에 있어서는 분사 위치가 라인 스피드, 강판 두께, 도금 부착량 등에 의해 변화되므로 현장에서 관리에 어려움이 크다.In particular, in the aqueous solution spraying method, since the spraying position is changed by line speed, steel plate thickness, plating amount, etc., it is difficult to manage on site.
본 발명은 상기 설명한 미니 스팡글의 생성을 방지하기 위해 아연 도금층의 응고 직전에 물 또는 수용액을 분사하는 방법의 문제점을 해결하기 위하여 이루어진 것으로, 정전기적 인력을 적용시켜 도금층을 균일하고 신속하게 응고시킴으로써 표면 외관이 우수한 미니 스팡글 용융도금강판을 제조하는 방법을 제공함에 그 목적이 있다.The present invention was made to solve the problem of the method of spraying water or an aqueous solution immediately before the solidification of the zinc plated layer to prevent the formation of the mini-spangle described above, by applying an electrostatic attraction to solidify the plated layer uniformly and quickly It is an object of the present invention to provide a method for producing a mini-spangle hot dip galvanized steel sheet having excellent surface appearance.
도 1 은 종래기술의 용융도금강판 제조 장치를 개략적으로 도시한 도면,1 is a view schematically showing a hot-dip galvanized steel sheet manufacturing apparatus of the prior art,
도 2 는 본 발명을 실시하기 위한 용융도금강판 제조장치를 도시한 도면이다.2 is a view showing a hot-dip galvanized steel sheet manufacturing apparatus for practicing the present invention.
〈도면의 주요 부분에 대한 부호의 설명〉<Explanation of symbols for main parts of drawing>
1: 강판 2: 도금욕 3: 에어 나이프 4: 스프레이 노즐1: steel plate 2: plating bath 3: air knife 4: spray nozzle
5: 고전압 발생기 6: 전극5: high voltage generator 6: electrode
상기 목적을 달성하기 위한 본 발명의 표면 외관이 우수한 미니 스팡글 용융도금강판을 제조하는 방법은, 용융도금강판의 도금 부착량을 에어 와이핑하여 조정후 스팡글 발생을 방지하기 위하여 미응고 도금층에 물 혹은 수용액을 분사하여 용융도금강판을 제조하는 방법에 있어서, 물 혹은 수용액의 미립 방울이 강판과의 정전기 인력에 의해 강판에 부착되도록 전기장을 형성하는 것을 특징으로 하는 구성이다.The method for producing a mini-spangle hot-dip galvanized steel sheet having an excellent surface appearance of the present invention for achieving the above object is, by air-wiping the coating weight of the hot-dip galvanized steel sheet to prevent spangles after adjustment to prevent water or water in the non-coagulated plating layer. In the method of manufacturing a hot-dip galvanized steel sheet by spraying an aqueous solution, the electric field is formed so that fine droplets of water or aqueous solution adhere to the steel sheet by electrostatic attraction with the steel sheet.
또한, 본 발명에서 전기장은 고전압 발생기에 의해 발생된 고전압을 대전시키는 전극과 그라운드에 연결된 강판 사이에 형성된다.Further, in the present invention, the electric field is formed between the electrode for charging the high voltage generated by the high voltage generator and the steel plate connected to the ground.
이하에서는 양호한 실시예와 관련하여 본 발명을 상세하게 설명한다.Hereinafter, the present invention will be described in detail with reference to the preferred embodiments.
먼저, 본 발명의 미니 스팡글 용융도금강판을 제조하기 위한 장치를 도 1 및 도 2 와 관련하여 설명한다.First, an apparatus for manufacturing a mini spangle hot-dip galvanized steel sheet of the present invention will be described with reference to FIGS. 1 and 2.
도 1 은 종래 실시중인 미니 스팡글 용융도금강판을 제조하기 위한 장치를 개략적으로 도시한 도면인데, 도금욕이 담겨진 도금욕조(2)에 강판(1)이 침적된후에 에어나이프(3)를 통과하면서 강판 표면의 도금 부착량을 조정하고, 강판 표면의 미응고 도금층에 스팡글(Spangle)이 형성되는 것을 방지하기 위해 물 또는 수용액을 분사하는 스프레이 노즐(4) 사이를 도금 강판(1)이 통과하도록 구성하였다.1 is a view schematically showing an apparatus for manufacturing a mini-spangle hot-dip galvanized steel sheet according to the prior art, which is passed through an air knife 3 after the steel sheet 1 is deposited in a plating bath 2 containing a plating bath. While the plated steel sheet 1 is passed between the spray nozzles 4 for spraying water or an aqueous solution in order to adjust the amount of plating on the surface of the steel sheet and to prevent the formation of spangles in the non-solidified plating layer on the surface of the steel sheet. Configured.
도 2 는 본 발명을 실시하기 위한 미니 스팡글 용융도금강판 제조장치를 도시한 도면인데, 스프레이 노즐(4) 사이를 도금 강판(1)이 통과하는 중에 노즐에서 분사된 물 또는 수용액이 정전기적 인력에 의해 강판 표면에 균일하게 효과적으로 부착되도록 전기장 발생 수단을 설치함을 특징으로 한다.2 is a view showing a mini-spangle hot-dip galvanized steel sheet manufacturing apparatus for carrying out the present invention, wherein the water or aqueous solution sprayed from the nozzle during the passage of the plated steel sheet 1 between the spray nozzles (4) electrostatic attraction It characterized in that the electric field generating means is installed to be uniformly and effectively attached to the surface of the steel sheet.
이 전기장 발생수단은, (+) 및 (-)의 두 단자가 구비되고 전극에 고전압을 공급하기 위한 고전압 발생기(5)와, 접지되지 않은 단자에 전기적으로 연결되어 강판(1)과의 사이에 전기장을 형성하도록 스프레이 노즐(4) 내측에 설치된 한 쌍의 전극(6)을 구비한다.The electric field generating means is provided with a high voltage generator (5) for supplying a high voltage to the electrode, having two terminals (+) and (-), and electrically connected to an ungrounded terminal, A pair of electrodes 6 provided inside the spray nozzle 4 to form an electric field is provided.
고전압발생기(5)의 하나의 단자는 그라운드에 접지되며, 강판(1)이 이송되는 하류 방향의 롤(7)도 그라운드에 접지되어 강판(1)과 전극(6) 사이에 전기장이 형성될 수 있는 것이다.One terminal of the high voltage generator 5 is grounded, and the roll 7 in the downstream direction in which the steel sheet 1 is conveyed is also grounded to ground to form an electric field between the steel sheet 1 and the electrode 6. It is.
본 발명 장치에서는 스프레이 노즐(4)과 강판(1) 사이의 거리가 종래 보다 멀게 설치된다.In the apparatus of the present invention, the distance between the spray nozzle 4 and the steel sheet 1 is provided farther than before.
다음에 본 발명의 미니 스팡글 용융도금강판 제조방법을 설명한다.Next, the mini-spangle hot-dip galvanized steel sheet manufacturing method of this invention is demonstrated.
도금욕을 통과한 강판(1)은 에어나이프(3) 사이를 통과하면서 에어와이핑하여 도금 부착량이 조정된다.The steel plate 1 which passed the plating bath is air-wiped while passing between the air knifes 3, and plating amount is adjusted.
이어서, 스프레이 노즐(4) 사이를 통과하면서 강판에 부착된 미응고 상태의 도금층에 물 혹은 수용액이 안개와 같은 상태로 분사되는 데, 이때, 고전압 발생기(5)에 의해 공급된 고전압이 대전된 전극(6)과 그라운드에 접지된 강판(1) 사이에는 고전압의 전기장이 형성되고 있다.Subsequently, water or an aqueous solution is sprayed into the uncoagulated plating layer attached to the steel sheet while passing through the spray nozzles 4 in a state of fog, and at this time, the high voltage charged electrode supplied by the high voltage generator 5 is applied. An electric field of high voltage is formed between the steel plate 1 grounded at 6 and the ground.
따라서, 분사된 물 혹은 수용액의 미립 방울은 고전압 전극(6)과 같은 극성을 갖도록 정전대전되며, 이로써 정전대전된 물 혹은 수용액의 미립 방울과 강판(1) 사이에 정전기적 인력이 발생하여 미립 방울은 강판에 균일하게 효과적으로 부착되어 스팡글의 생성을 방지한다.Therefore, the fine droplets of the sprayed water or aqueous solution are electrostatically charged to have the same polarity as the high voltage electrode 6, whereby electrostatic attraction is generated between the fine droplets of the electrostatically charged water or aqueous solution and the steel sheet 1. The silver is uniformly and effectively attached to the steel sheet to prevent the generation of spangles.
본 발명에서는 강판에 분사되는 수용액의 분사 압력을 가능한 낮추는데, 스프레이 노즐(4)에 공급되는 공기압을 낮추거나, 스프레이 노즐(4)과 강판(1) 사이의 거리가 종래 보다 멀게 스프레이 노즐(4)을 설치함으로써 이를 달성할 수 있다.In the present invention, the spray pressure of the aqueous solution sprayed on the steel sheet is lowered as much as possible, and the air pressure supplied to the spray nozzle 4 is lowered or the distance between the spray nozzle 4 and the steel sheet 1 is farther than that of the conventional spray nozzle 4. This can be achieved by installing.
본 발명에서는 특히 스프레이 노즐(4)과 강판(1) 사이의 거리를 종래 보다 멀게하여 분무된 수용액의 방울을 작게 하면서도 강판에 가해지는 분사 압력을 낮춘다.In the present invention, in particular, the distance between the spray nozzle 4 and the steel sheet 1 is made farther than before, thereby reducing the spray pressure applied to the steel sheet while reducing the droplet of the sprayed aqueous solution.
이로써, 종래의 경우, 강판의 온도가 고온인 관계로 주위 분위기와의 온도 차이에 의해 대류 현상이 발생하는 열적 경계층이 형성되어 수용액 방울이 부착되는 것이 방해받고, 이를 극복하기 위해 수용액의 분사 압력을 증가시키고 이 경우 분사된 기체의 난류화가 극심해져 미응고된 도금층에 분사 궤적이 전사되어 외관의 불균일을 유발하고, 이를 방지하기 위해 공기압을 낮출 경우 수용액 방울이 열적 경계층을 극복하지 못하여 스팡글이 형성되는 문제가 해결되며, 분사 궤적이 도금층에 나타나는 것을 방지하기 위해 응고 직전에 분사하는 경우 스팡글이 도금층 표면에 형성되는 문제를 해결할 수 있다.Thus, in the conventional case, since the temperature of the steel sheet is a high temperature, a thermal boundary layer in which convection occurs due to a temperature difference with the ambient atmosphere is prevented from adhering to the droplets of the aqueous solution, and an injection pressure of the aqueous solution is increased to overcome this. In this case, the turbulent turbulence of the injected gas is so severe that the injection trajectory is transferred to the uncondensed plating layer, causing unevenness in appearance. Is solved, and when spraying just before solidification in order to prevent the injection trajectory from appearing in the plating layer, the problem that the spangles are formed on the plating layer surface can be solved.
또한, 정전기적 인력을 적용시키지 않는 경우 분사된 수용액 방울이 강판과 충돌후 튀기는 양이 많아 냉각 효과가 저하하나 본 발명에서와 같이 정전기적 인력을 발생시키면 분사된 수용액이 튀기는 양이 감소되어 스팡글 형성을 더욱 효과적으로 방지할 수 있다.In addition, when the electrostatic attraction is not applied, the sprayed aqueous solution drops after the collision with the steel sheet, so the cooling effect is reduced, but when the electrostatic attraction is generated as in the present invention, the amount of the sprayed aqueous solution splashes is reduced to form spangles. Can be prevented more effectively.
이하에서는 실시예와 관련하여 본 발명을 보다 상세하게 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.
실시예Example
미니 스팡글 용융도금강판 제조장치에서, 아연을 기본으로 하고, Pb: 0012 중량%, Al: 0.18 중량%의 조성을 갖는 도금욕에 침적한 강판을 에어와이핑하여 도금 부착량을 편면당 150 g/㎡ 부착시킨 후에, 스프레이 노즐을 통해 중인산염 수용액을 이송되는 강판에 분사함과 동시에 표 1 에 나타낸 바와 같이, 고전압발생기의 인가 전압을 변화시켜 강판과 전극 상이에 정전 자기장을 형성시켜 용융도금강판을 제조하였다.In the apparatus for producing a mini-spangle hot-dip galvanized steel sheet, the coating weight is 150 g / m2 per side by air-wiping a steel plate deposited in a plating bath having a composition of zinc, Pb: 0012 wt% and Al: 0.18 wt%. After the adhesion, the aqueous solution of heavy acid salt is sprayed through the spray nozzle onto the steel sheet to be transported, and at the same time, as shown in Table 1, the applied voltage of the high voltage generator is changed to form an electrostatic magnetic field between the steel sheet and the electrode to produce a hot-dip galvanized steel sheet. It was.
제조된 강판의 표면 외관을 검사한 결과를 표 1 에 나타내었는데, 불균일로 판단한 것은 강판 표면에 큰 스팡글이 형성된 경우이며, 스팡글 형성이 식별하기 어려운 정도이고 수용액 방울이 강판 표면에 충돌시 나타나는 분사궤적의 발생이 없으면 균일한 것으로 판단하였다.Table 1 shows the results of inspecting the surface appearance of the manufactured steel sheet, which was determined to be non-uniform when large spangles were formed on the surface of the steel sheet. If no trajectory occurred, it was judged to be uniform.
[표 1]TABLE 1
이로부터 알 수 있는 바와 같이, 정전 전기장을 형성시킴이 없는 종래 방법으로 제조한 경우에는 큰 스팡글이 형성되어 강판 표면이 불균일함에 반하여,본 발명에 의해 제조된 용융도금강판에서는 강판 표면에 분사된 용액에 의한 분사궤적이 나타나지 않으며 발생된 미니 스팡글이 식별할 수 없을 정도이어서 강판 표면의 외관이 균일함을 알 수 있다.As can be seen from this, when manufactured by the conventional method without forming an electrostatic electric field, large spangles are formed and the surface of the steel sheet is uneven, whereas in the hot dip galvanized steel sheet manufactured by the present invention, The spray traces by the solution do not appear and the generated mini spangle is indistinguishable, indicating that the appearance of the steel sheet is uniform.
따라서, 상기 설명한 바와 같은 본 발명에 의하면, 미니 스팡글 용융도금강판 제조 공정을 간단화할 수 있어서 제조가 용이하고 용융도금강판의 표면 외관이 양호한 등 유용한 효과가 달성된다.Therefore, according to the present invention as described above, it is possible to simplify the mini-spangle hot-dip galvanized steel sheet manufacturing process, so that useful effects such as easy production and good surface appearance of the hot-dip galvanized steel sheet are achieved.
Claims (2)
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| KR10-1998-0062087A KR100380134B1 (en) | 1998-12-30 | 1998-12-30 | Manufacturing method of hot dip galvanized steel sheet with excellent surface appearance |
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| KR10-1998-0062087A KR100380134B1 (en) | 1998-12-30 | 1998-12-30 | Manufacturing method of hot dip galvanized steel sheet with excellent surface appearance |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100415677B1 (en) * | 1999-12-28 | 2004-01-31 | 주식회사 포스코 | A Method for Producing Spangle Free Hot Dip Galvanizing Steel Sheet |
| KR100504370B1 (en) * | 2000-12-27 | 2005-07-28 | 주식회사 포스코 | Method and apparatus for producing the zinc plated steel |
| KR100742832B1 (en) * | 2004-12-28 | 2007-07-25 | 주식회사 포스코 | Galvanized Steel-Sheet Without Spangle, Manufacturing Method Thereof and Device Used Therefor |
| KR100815818B1 (en) * | 2001-12-26 | 2008-03-20 | 주식회사 포스코 | Apparatus for continuous metal coating of strip and method for continuous metal coating of strip using the same |
| WO2017111484A1 (en) * | 2015-12-22 | 2017-06-29 | 주식회사 포스코 | Hot-dip galvanized steel sheet with excellent surface quality and resistance to low temperature brittle fracture |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54139839A (en) * | 1978-04-24 | 1979-10-30 | Nippon Parkerizing Co Ltd | Pulverizing method for spangles of galvanized steel sheet |
| JPS54160524A (en) * | 1978-06-09 | 1979-12-19 | Nippon Steel Corp | Fining device for spangle in hot galvanization |
| US4500561A (en) * | 1983-07-25 | 1985-02-19 | Inland Steel Company | Minimization of spangling on hot dip galvanized steel strip |
-
1998
- 1998-12-30 KR KR10-1998-0062087A patent/KR100380134B1/en not_active IP Right Cessation
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100415677B1 (en) * | 1999-12-28 | 2004-01-31 | 주식회사 포스코 | A Method for Producing Spangle Free Hot Dip Galvanizing Steel Sheet |
| KR100504370B1 (en) * | 2000-12-27 | 2005-07-28 | 주식회사 포스코 | Method and apparatus for producing the zinc plated steel |
| KR100815818B1 (en) * | 2001-12-26 | 2008-03-20 | 주식회사 포스코 | Apparatus for continuous metal coating of strip and method for continuous metal coating of strip using the same |
| KR100742832B1 (en) * | 2004-12-28 | 2007-07-25 | 주식회사 포스코 | Galvanized Steel-Sheet Without Spangle, Manufacturing Method Thereof and Device Used Therefor |
| WO2017111484A1 (en) * | 2015-12-22 | 2017-06-29 | 주식회사 포스코 | Hot-dip galvanized steel sheet with excellent surface quality and resistance to low temperature brittle fracture |
| US11078564B2 (en) | 2015-12-22 | 2021-08-03 | Posco | Hot-dip galvanized steel sheet with excellent surface quality and resistance to low temperature brittle fracture |
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| KR100380134B1 (en) | 2003-07-10 |
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