KR101126014B1 - Manufacturing Method of Galvannealed Steel Sheet - Google Patents
Manufacturing Method of Galvannealed Steel Sheet Download PDFInfo
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- KR101126014B1 KR101126014B1 KR1020090072768A KR20090072768A KR101126014B1 KR 101126014 B1 KR101126014 B1 KR 101126014B1 KR 1020090072768 A KR1020090072768 A KR 1020090072768A KR 20090072768 A KR20090072768 A KR 20090072768A KR 101126014 B1 KR101126014 B1 KR 101126014B1
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- steel sheet
- cooling
- dip galvanized
- alloyed hot
- galvanized steel
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 96
- 239000010959 steel Substances 0.000 claims abstract description 96
- 238000001816 cooling Methods 0.000 claims abstract description 59
- 230000001050 lubricating effect Effects 0.000 claims abstract description 41
- 229910001335 Galvanized steel Inorganic materials 0.000 claims abstract description 33
- 239000008397 galvanized steel Substances 0.000 claims abstract description 33
- 239000007864 aqueous solution Substances 0.000 claims abstract description 20
- 239000011248 coating agent Substances 0.000 claims abstract description 15
- 238000000576 coating method Methods 0.000 claims abstract description 15
- 238000005275 alloying Methods 0.000 claims abstract description 10
- 238000002347 injection Methods 0.000 claims description 20
- 239000007924 injection Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 11
- 239000007800 oxidant agent Substances 0.000 claims description 11
- 229910052698 phosphorus Inorganic materials 0.000 claims description 11
- 239000011574 phosphorus Substances 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 3
- 230000005684 electric field Effects 0.000 claims description 2
- 238000007747 plating Methods 0.000 description 12
- 238000005452 bending Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 10
- 229910019142 PO4 Inorganic materials 0.000 description 9
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 9
- 239000010452 phosphate Substances 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 6
- 230000001590 oxidative effect Effects 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 238000005246 galvanizing Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- -1 oxide Substances 0.000 description 1
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 description 1
- 239000003760 tallow Substances 0.000 description 1
- VKFFEYLSKIYTSJ-UHFFFAOYSA-N tetraazanium;phosphonato phosphate Chemical compound [NH4+].[NH4+].[NH4+].[NH4+].[O-]P([O-])(=O)OP([O-])([O-])=O VKFFEYLSKIYTSJ-UHFFFAOYSA-N 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—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
- C23C2/14—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
-
- 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
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
- C23C2/29—Cooling or quenching
-
- 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
Abstract
본 발명은 합금화 용융아연도금강판의 제조방법에 있어서, 합금화 단계 후 강판을 냉각하는 단계에서 수용액 액적을 이용하여 강판을 냉각하고, 더불어 윤활피막을 형성하는 합금화 용융아연도금강판의 제조방법을 제공하고자 한다. The present invention provides a method for producing an alloyed hot-dip galvanized steel sheet, in which the steel sheet is cooled using an aqueous solution droplet in the step of cooling the steel plate after the alloying step, and also forms a lubricating coating. do.
본 발명에 의하여 합금화 용융아연도금강판의 냉각시 수용액 액적을 균일하게 분사하여 강판의 온도를 균일하게 냉각시켜 형상이 우수한 합금화 용융아연도금강판을 제공할 수 있다. 더불어, 냉각과 동시에 윤활피막을 형성하여 합금화 용융아연도금강판의 표면마찰계수를 낮춤으로써 가공시 크랙을 방지할 수 있으며, 하나의 단계에서 냉각 및 윤활 피막을 제공할 수 있어 경제성을 높일 수 있다. According to the present invention, an aqueous solution droplet is uniformly sprayed upon cooling of the alloyed hot dip galvanized steel sheet to uniformly cool the temperature of the steel sheet, thereby providing an alloyed hot dip galvanized steel sheet having excellent shape. In addition, by forming a lubricating film at the same time with cooling to lower the surface friction coefficient of the alloyed hot-dip galvanized steel sheet to prevent cracks during processing, it is possible to provide a cooling and lubricating coating in one step to increase the economics.
합금화 용융아연도금강판, 대전전극, 냉각장치, 윤활피막 Alloyed hot dip galvanized steel sheet, charging electrode, cooling device, lubricating film
Description
본 발명은 대전전극을 이용하여 합금화 용융아연도금강판을 균일하게 냉각시키고 더불어 윤활피막을 형성하는 합금화 용융아연도금강판의 제조방법에 관한 것이다.The present invention relates to a method for producing an alloyed hot-dip galvanized steel sheet that uniformly cools an alloyed hot-dip galvanized steel sheet using a charging electrode and forms a lubricating film.
합금화 용융아연도금강판은 용융아연도금강판에 비해 용접성이 우수하고, 표면외관이 미려하여 가전제품 및 자동차의 판넬용으로 광범위하게 사용되고 있다.Alloyed hot-dip galvanized steel sheet has excellent weldability compared to hot-dip galvanized steel sheet and has a beautiful surface appearance, so it is widely used for home appliances and automobile panels.
합금화 용융아연도금강판은 강판을 도금욕에 침지하여 강판을 도금하고 와이핑에 의해 도금부착량을 조절한 후 강판을 500℃ 부근으로 가열하여 도금층에 포함한 아연과 소지철을 반응시켜 아연-철 합금이 되는 합금화 공정과 상기 공정 후 냉각공정을 거쳐 제조된다.The alloyed hot-dip galvanized steel sheet is coated with a steel plate by immersing the steel plate in a plating bath, and the coating amount is controlled by wiping, and then the steel plate is heated to around 500 ° C to react zinc and base iron in the plating layer to react the zinc-iron alloy. It is prepared through an alloying process and a cooling process after the process.
그러나, 냉각공정에 있어서, 강판의 온도가 250~300℃인 상태로 강판이 포트 상부에 있는 탑 롤을 통과하게 되면 도금층이 강판으로부터 탈락되고 상기 탈락된 도금층이 롤에 부착되어 덴트성 결함을 유발하고, 또한, 강판의 열에 의해 롤 수명이 짧아지는 문제점이 발생될 수 있다. 이를 방지하기 위하여, 강판을 충분히 냉각하여 강판 온도를 가능한 한 낮게 하는 것이 바람직하다.However, in the cooling process, when the steel sheet passes through the top roll in the upper portion of the pot at a temperature of 250 to 300 ° C., the plating layer is dropped from the steel sheet, and the peeled plating layer adheres to the roll, causing a dent defect. In addition, a problem of shortening the roll life due to heat of the steel sheet may occur. In order to prevent this, it is preferable to sufficiently cool the steel sheet to make the steel sheet temperature as low as possible.
일반적으로 강판을 냉각시키는 방법으로는 공냉 또는 수냉 방식이 사용되고 있다. 공냉 방식은 냉각에 필요한 설비가 간단한 장점이 있지만 냉각속도가 느려서 냉각에 많은 시간이 필요하며, 이를 위해서, 강판의 진행속도를 느리게 하거나, 탑 롤을 지상에서 높게 설치하여 냉각시간을 길게 가져가야 하므로 생산성이 떨어지고, 설비비가 많이 소요된다. In general, air or water cooling is used as a method of cooling the steel sheet. Air-cooling method has the advantage that the equipment required for cooling has a simple advantage, but it requires a lot of time for cooling due to the slow cooling speed. For this purpose, it is necessary to slow down the speed of steel sheet or install the top roll on the ground to increase the cooling time. Productivity falls and equipment costs are high.
반면에, 수냉 방식은 공냉 방식에 비하여 냉각 효율은 좋으나, 강판에 물을 균일하게 분사하지 못할 경우, 강판 부위별로 온도 편차가 발생하여 강판에 굴곡이 발생하고 형상이 불량해지기 쉽다. 특히, 폭 방향으로 다수의 노즐을 설치함에 따라, 폭 방향으로 분사용액의 운동궤적을 균일하게 제어하는 것이 매우 힘들고 강판의 폭이 넓어질수록 형상 불량의 위험은 커지게 된다. On the other hand, the water-cooling method has better cooling efficiency than the air-cooling method, but when water is not uniformly sprayed on the steel sheet, temperature deviation occurs for each steel sheet, causing bending to the steel sheet and poor shape. In particular, as a plurality of nozzles are installed in the width direction, it is very difficult to uniformly control the motion trajectory of the injection solution in the width direction, and the wider the width of the steel sheet, the greater the risk of poor shape.
또한, 합금화 용융아연도금강판은 아연도금강판보다 표면마찰계수가 높아서 프레스 가공시 크랙이 발생할 가능성이 높고, 이를 방지하기 위하여는 소지철이 충 분한 성형성을 가져야 한다. 소지철의 성형성은 강중 탄소함량이 낮을수록 향상되지만, 제조원가가 상승되는 문제점이 있다. In addition, the alloyed hot-dip galvanized steel sheet has a higher surface friction coefficient than the galvanized steel sheet, so it is more likely to cause cracks during press working, and in order to prevent this, the base iron should have sufficient formability. Formability of the base iron is improved as the carbon content in the steel is lower, but there is a problem that the manufacturing cost is increased.
이를 해결하기 위하여, 합금화 용융아연도금강판의 표면에 윤활피막을 형성하고 그 부착량은 50~200mg/㎡로 제어하여 도금층의 마찰계수를 낮추고 있다. 윤활 처리된 합금화 용융아연도금강판은 종래에 사용된 합금화 용융아연도금강판보다 강판 구입비용이 저렴하고, 강판의 프레스 가공이 용이하다. 윤활피막처리에 있어서 피막성분으로는 인산염계, 산화물계 및 Ni등의 금속계 등 다양하고, 상기 윤활피막처리는 도금층을 완전히 냉각시킨 후 소지철의 재질을 확보하고 형상교정이 목적인 조질압연을 실시하고 난 후에 강판 표면에 실시한다.In order to solve this problem, a lubricating film is formed on the surface of the alloyed hot-dip galvanized steel sheet and its adhesion amount is controlled to 50 to 200 mg / m 2 to lower the friction coefficient of the plating layer. The lubricated alloyed hot-dip galvanized steel sheet is cheaper in steel sheet purchase cost than the conventional alloyed hot-dip galvanized steel sheet, and the press working of the steel sheet is easy. In the lubrication coating treatment, there are various coating components such as phosphate, oxide, and Ni-based metals.The lubrication coating treatment is to cool the plated layer, secure the material of the base iron, and perform temper rolling for the purpose of shape correction. After it is carried out on the surface of the steel sheet.
인산염계의 윤활피막을 형성하기 위해서는 인산염계의 용액을 강판 표면에 도포한 후 수분을 증발시키고, 피막의 구성물들을 반응시킨 후 건조시킬 수 있는 설비가 필요하다. 더불어, Ni등의 금속계에서는 전기도금 설비가 필요하다. 상술한 바와 같이, 종래에는 윤활피막처리를 하기 위한 별도의 설비가 필요하며, 피막건조 혹은 전기도금을 위한 별도의 에너지가 필요한 문제점이 있다.In order to form a phosphate-based lubricating film, it is necessary to apply a phosphate-based solution to the surface of the steel sheet, and then to evaporate moisture, react the components of the film, and then dry the equipment. In addition, in the metal system such as Ni, electroplating equipment is required. As described above, conventionally, a separate facility for lubricating film treatment is required, and there is a problem that a separate energy for film drying or electroplating is required.
본 발명은 합금화 용융아연도금강판의 제조방법에 있어서, 합금화 단계 후 강판을 냉각하는 단계에서 대전된 수용액 액적을 이용하여 강판을 냉각하고, 더불어 강판에 윤활피막을 형성하는 합금화 용융아연도금강판의 제조방법을 제공하고자 한다. The present invention provides a method of manufacturing an alloyed hot-dip galvanized steel sheet, the method of producing an alloyed hot-dip galvanized steel sheet to cool the steel sheet using the aqueous solution of the liquid charged in the step of cooling the steel sheet after the alloying step, and to form a lubricating film on the steel sheet To provide a method.
본 발명은 일구현례로서, 합금화 용융아연도금강판의 제조단계 중 합금화 단계 후 강판을 수냉시키는 단계에서, 상기 강판을 향해 분사노즐로부터 분사된 물 또는 수용액 액적에 대전전극에 의하여 -3kV ~ -50kV의 전압을 인가하여, 상기 액적이 대전된채 강판을 냉각시키는 단계를 포함하는 합금화 용융아연도금강판의 제조방법이다.In one embodiment, in the step of water-cooling the steel sheet after the alloying step in the manufacturing step of the alloyed hot-dip galvanized steel sheet, -3kV ~ -50kV by the charging electrode to the water or aqueous solution sprayed from the spray nozzle toward the steel sheet The method of producing an alloyed hot-dip galvanized steel sheet comprising the step of applying a voltage of, cooling the steel sheet while the droplets are charged.
상기 액적을 대전시키는 대전전극은 와이어 또는 메쉬형태의 대전전극인 것이 바람직하다.The charging electrode for charging the droplets is preferably a charging electrode in the form of a wire or mesh.
상기 대전전극은 상기 분사노즐과 상기 강판 사이에 위치하며, 상기 분사노즐로부터 분사된 액적이 상기 대전전극을 관통하여 대전되는 것이 바람직하다.The charging electrode is positioned between the injection nozzle and the steel plate, it is preferable that the droplets injected from the injection nozzle is charged through the charging electrode.
상기 분사노즐은 상기 대전전극과 상기 강판 사이에 위치하되 상기 대전전극보다 하부에 위치하며, 상기 분사노즐로부터 분사된 액적이 상기 강판의 진행방향으로 분사될 때 상기 대전전극와 상기 강판 사이에 형성된 전기장에 의해 대전되는 것이 바람직하다.The injection nozzle is positioned between the charging electrode and the steel sheet, but is located below the charging electrode, and when the droplets injected from the injection nozzle are sprayed in the advancing direction of the steel sheet, the injection nozzle is disposed between the charging electrode and the steel sheet. Is preferably charged.
상기 수용액은 윤활피막 형성물질을 포함하여 상기 강판의 냉각과 함께 상기 강판에 윤활피막을 형성하는 것이 바람직하다.The aqueous solution may include a lubricating film-forming material to form a lubricating film on the steel sheet together with cooling of the steel sheet.
상기 윤활피막의 부착량은 금속원소로 환산하여 10~500㎎/㎡인 것이 바람직하다.The adhesion amount of the lubricating film is preferably 10 ~ 500mg / ㎡ in terms of metal elements.
상기 윤활피막 형성물질은 P(인)함유물질을 포함하며, 상기 윤활피막은 P(인)함유 윤활피막인 것이 바람직하다.The lubricating film forming material includes a P (phosphorus) containing material, and the lubricating film is preferably a P (phosphorus) containing lubricating film.
상기 윤활피막 형성물질은 산화제를 포함하며, 상기 윤활피막은 산화물함유 윤활피막인 것이 바람직하다.The lubricating film forming material includes an oxidizing agent, and the lubricating film is preferably an oxide-containing lubricating film.
상기 윤활피막 형성물질은 P(인)함유물질 60~80 중량% 및 산화제 20~40 중량%를 포함하며, 상기 윤활피막은 P(인) 및 산화물 함유 윤활피막인 것이 바람직하다.The lubricating film forming material may include 60 to 80% by weight of a P (phosphorus) -containing material and 20 to 40% by weight of an oxidizing agent, and the lubricating film is preferably a lubricating film containing P (phosphorus) and an oxide.
상기 강판을 수냉시키는 단계에서 대전된 액적을 이용한 냉각방법에, 공냉방법 및 대전된 액적을 이용하지 않는 수냉방법 중 1종 이상의 방법을 함께 이용하여 강판을 냉각시키는 단계를 포함하는 것이 바람직하다.In the cooling method using the charged droplets in the step of water-cooling the steel sheet, it is preferable to include the step of cooling the steel sheet by using at least one of the air cooling method and the water cooling method without using the charged droplets.
본 발명에 의하여 합금화 용융아연도금강판의 냉각시 수용액 액적을 균일하게 분사하여 강판의 온도를 균일하게 냉각시켜 형상이 우수한 합금화 용융아연도금강판을 제공할 수 있다. 더불어, 냉각과 동시에 윤활피막을 형성하여 합금화 용융 아연도금강판의 표면마찰계수를 낮춤으로써 가공시 크랙을 방지할 수 있으며, 하나의 단계에서 냉각 및 윤활 피막을 제공할 수 있어 경제성을 높일 수 있다. According to the present invention, an aqueous solution droplet is uniformly sprayed upon cooling of the alloyed hot dip galvanized steel sheet to uniformly cool the temperature of the steel sheet, thereby providing an alloyed hot dip galvanized steel sheet having excellent shape. In addition, by forming a lubricating film at the same time cooling to lower the surface friction coefficient of the alloyed hot-dip galvanized steel sheet to prevent cracks during processing, it is possible to provide a cooling and lubricating coating in one step to increase the economics.
본 발명은 합금화 용융아연도금강판의 제조단계 중 합금화 단계 후 강판을 수냉시키는 단계에서, 상기 강판을 향해 분사노즐로부터 분사된 물 또는 수용액 액적에 대전전극에 의하여 -3kV ~ -50kV의 전압을 인가하여, 상기 액적이 대전된채 강판을 균일하게 냉각시킬 수 있다. The present invention in the step of water-cooling the steel sheet after the alloying step in the manufacturing step of the alloyed hot-dip galvanized steel sheet, by applying a voltage of -3kV ~ -50kV by the charging electrode to the water or aqueous solution sprayed from the injection nozzle toward the steel sheet The steel sheet may be uniformly cooled while the droplets are charged.
도1에는 본 발명의 합금화 용융아연도금강판의 제조공정의 일부가 모식적으로 나타나 있다. 도1에 나타난 바와 같이, 합금화 용융아연도금강판을 제조하기 위해서는 강판을 도금포트(1)에 침지하여 강판을 도금한 후 에어나이프(2)에 의하여 도금량을 제어한다. 이후 상기 도금된 강판을 합금화로(3)를 통과시키고 균열로(4)를 통과하여 합금화시킨 후 냉각장치(5)에 의하여 강판을 냉각시키고 탑롤(6)에 의하여 강판의 진행방향을 변화시킨다.Figure 1 schematically shows a part of the manufacturing process of the alloyed hot-dip galvanized steel sheet of the present invention. As shown in FIG. 1, in order to manufacture an alloyed hot-dip galvanized steel sheet, the steel plate is immersed in the plating port 1 to plate the steel plate, and then the plating amount is controlled by the air knife 2. After the plated steel sheet is passed through the alloying furnace (3) and alloyed through the cracking furnace (4), the steel sheet is cooled by the cooling device (5) and the advancing direction of the steel sheet by the top roll (6).
상기 냉각장치는 수용액을 분사하여 강판을 냉각시킬 수 있는 것이라면 어느 것이나 사용가능하다. 특별히 한정되는 것은 아니지만 도1에 나타난 바와 같이, 3구간(5a, 5b, 5c)에 적용되는 것이 바람직하다. 상기 냉각장치가 3구간으로 이루어진 경우에는 본 발명의 냉각방법은 강판 진행방향으로 보아 상부에 위치한 2개의 구간(5b, 5c)에 적용하는 것이 바람직하다.The cooling device may be used as long as it can spray the aqueous solution to cool the steel sheet. Although not particularly limited, as shown in FIG. 1, it is preferable to be applied to the three
바람직한 냉각장치로는 수용액을 분사시키는 분사노즐과 이 노즐에서 분사되는 수용액 액적을 대전시키기 위한 대전전극을 구비한 냉각장치를 들수 있다. 또한, 상기 대전전극은 와이어 또는 메쉬형태의 대전전극인 것일 수 있다.Preferred cooling devices include a cooling device having an injection nozzle for injecting an aqueous solution and a charging electrode for charging an aqueous solution droplet ejected from the nozzle. In addition, the charging electrode may be a wire or mesh type charging electrode.
상기 냉각장치는 일실시예로서, 분사노즐과 강판 사이에 대전전극이 위치하여 상기 분사노즐로부터 분사된 액적이 상기 대전전극을 관통하여 대전되는 것일 수 있다.In one embodiment, the cooling device may be a charging electrode is positioned between the injection nozzle and the steel sheet so that the droplets injected from the injection nozzle are charged through the charging electrode.
또한, 다른 실시예로서, 분사노즐이 대전전극과 강판 사이에 위치하되 상기 대전전극보다 하부에 위치하여 상기 분사노즐로부터 분사된 액적이 상기 강판의 진행방향으로 분사될 때 상기 대전전극와 상기 강판 사이에 형성된 전기장에 의해 대전되는 것일 수 있다.Further, as another embodiment, the injection nozzle is located between the charging electrode and the steel sheet but located below the charging electrode and when the droplet sprayed from the injection nozzle is injected in the advancing direction of the steel sheet between the charging electrode and the steel sheet It may be charged by the electric field formed.
더불어, 상기 냉각방법과 함께 공냉방법 및 대전된 액적을 이용하지 않는 수냉방법 중 1종 이상의 방법을 함께 이용하여 강판을 냉각시킬 수 있다.In addition, the steel sheet may be cooled by using at least one of an air cooling method and a water cooling method that does not use charged droplets together with the cooling method.
상기와 같이 수용액 액적들을 대전시킨 경우에는 액적들이 동일한 극성을 갖게 되어 분사된 액적들은 서로 반발하려는 힘이 작용하게 되어 분사궤적의 공간상 에 액적들이 균일하게 분포되어 강판의 표면을 균일한 온도로 냉각시킬 수 있다. 추가적으로 고전압에 의해 분사 균일성 뿐만 아니라 액적의 강판 부착효율이 향상될 수 있다.When the aqueous solution droplets are charged as described above, the droplets have the same polarity, and the sprayed droplets act to repel each other so that the droplets are uniformly distributed in the space of the injection trace, thereby cooling the surface of the steel sheet to a uniform temperature. You can. In addition, due to the high voltage, not only the spray uniformity but also the steel plate adhesion efficiency of the droplets may be improved.
이 때, 액적들을 대전시키기 위한 전압의 세기는 -3kV ~ -50kV로 한정하는 것이 바람직하다. 전압의 세기가 -3kV 미만인 경우에는 상기 전압 인가의 효과가 거의 나타나지 않고, -50kV를 초과하는 경우에는 전기 스파크가 날 위험이 있다. At this time, the strength of the voltage for charging the droplets is preferably limited to -3kV to -50kV. If the intensity of the voltage is less than -3kV, the effect of the voltage application is hardly exhibited, and if it exceeds -50kV, there is a risk of electric sparks.
상기 냉각장치를 통하여 분사되는 수용액에는 윤활피막 형성물질을 포함한다. 상기 윤활피막 형성물질로는 P함유물질 또는 산화제 또는 이들의 혼합물을 사용하는 것이 바람직하다. 보다 바람직하게는 P(인)함유물질 60~80 중량% 및 산화제 20~40 중량%이 함유될 수 있다.The aqueous solution sprayed through the cooling device includes a lubricating film forming material. As the lubricating film forming material, it is preferable to use a P-containing material or an oxidizing agent or a mixture thereof. More preferably, 60 to 80% by weight of the P (phosphorus) -containing material and 20 to 40% by weight of the oxidizing agent may be contained.
상기 P(인)함유물질은 제일인산암모늄, 제이인산암모늄, 제일인산나트륨 및 제이인산나트륨으로 이루어진 인산염계 그룹으로부터 선택된 적어도 1종인 것이 바람직하다. 다만, 상기 산화제는 특별히 한정되는 것은 아니며 산화제의 특성을 나타낼 수 있는 것이라면 어느 것이라도 사용할 수 있다.The P (phosphorus) -containing material is preferably at least one selected from the group consisting of phosphate groups consisting of ammonium monophosphate, ammonium diphosphate, sodium monophosphate and sodium diphosphate. However, the oxidant is not particularly limited and any oxidant can be used as long as it can exhibit the properties of the oxidant.
특히, 강판에 분사되는 수용액에 P(인)함유물질이 포함되는 경우에는 물은 강판의 잠열에 의하여 증발되고 상기 P(인)함유물질만이 강판에 남게되어 윤활피막 이 형성된다. 또한, 상기 반응은 흡열반응인 인산의 축합반응이므로 순수한 물을 사용할 때 보다 냉각효율을 더 향상시킬 수 있다. 또한, 상기 수용액에 산화제가 포함되는 경우에는 산화제가 도금층을 산화시켜 도금층 표면에 윤활피막을 형성할 수 있다. In particular, when the P (phosphorus) containing material is contained in the aqueous solution sprayed on the steel sheet, water is evaporated by the latent heat of the steel sheet, and only the P (phosphorus) containing material remains on the steel sheet to form a lubricating film. In addition, since the reaction is a condensation reaction of phosphoric acid which is an endothermic reaction, it is possible to further improve the cooling efficiency than when using pure water. In addition, when the oxidant is included in the aqueous solution, the oxidant may form a lubricating film on the surface of the plating layer by oxidizing the plating layer.
그리고 윤활피막의 부착량은 금속원소로 환산하여 10~500㎎/㎡인 것이 바람직하다. 윤활피막의 부착량이 금속원소로 환산하여 10㎎/㎡ 미만인 경우에는 부착량이 너무 적어 윤활 효과를 충분히 발휘할 수 없고, 500㎎/㎡를 초과하는 경우에는 윤활효과는 얻어지지만 탈지공정에서 피막이 완전히 제거되지 않고 피막이 잔존하여 도장품질이 열위되는 문제점이 있다.And the adhesion amount of the lubricating film is preferably 10 ~ 500mg / ㎡ in terms of metal elements. If the adhesion amount of the lubricating film is less than 10 mg / m2 in terms of metal elements, the adhesion amount is too small to sufficiently exert a lubricating effect. If it exceeds 500 mg / m2, the lubricating effect is obtained, but the film is not completely removed in the degreasing process. There is a problem that the film quality is inferior due to the remaining film.
본 발명은 상기와 같이 강판을 냉각함과 동시에 강판에 윤활피막을 제공함으로써, 기존의 설비에 비하여 공정을 크게 단축시킬 수 있으며, 대전된 수용액 액적으로 인하여 강판을 균일하게 냉각할 수 있다.The present invention by cooling the steel sheet as described above and by providing a lubricating coating on the steel sheet, it is possible to significantly shorten the process compared to the existing equipment, it is possible to uniformly cool the steel sheet due to the charged aqueous solution droplets.
상기 방법에 의하여 강판을 냉각하여 상기 강판이 탑롤에 도달될 때, 상기 강판의 온도는 300℃ 이하가 되는 것이 바람직하다. 300℃를 초과하는 경우에는 강판이 탑롤을 지나갈 때 도금층이 탑롤에 부착되어 탈락될 수 있어서 강판 표면에 덴트 형태의 찍힘 마크를 유발시킬 위험이 높아진다. 따라서, 용액 분사 및 고전압대전설비는 강판 온도가 300℃ 이하까지 냉각을 시킬 수 있는 규모로 이루어지는 것이 바람직하며, 강판의 생산속도가 증가할수록 설비의 규모는 증가될 수 있다.When the steel sheet is cooled by the above method and the steel sheet reaches the top roll, the temperature of the steel sheet is preferably 300 ° C. or lower. When the temperature exceeds 300 ° C., when the steel sheet passes through the top roll, the plating layer may adhere to the top roll and drop off, thereby increasing the risk of causing a dent-shaped mark on the surface of the steel sheet. Therefore, the solution injection and the high-voltage charging equipment is preferably made of a scale capable of cooling the steel sheet temperature to 300 ℃ or less, the scale of the equipment can be increased as the production rate of the steel sheet increases.
이하, 실시예를 통하여 본 발명을 설명하고자 한다.Hereinafter, the present invention will be described through examples.
(실시예1)Example 1
폭이 300mm인 0.7t의 강판을 분당 10m의 속도로 이송시켜서 환원성 분위기에서 소둔 열처리한 후 상기 강판을 Al 0.14중량% 함유된 용융아연도금 포트를 통과시킨 후 에어나이프에 의해 아연도금 부착량을 한면당 60g/㎡로 제어하였다. 이 후 600℃에서 합금화 열처리를 실시하고 하기 표1에 기재된 냉각방법에 의하여 상기 강판을 냉각시켰다. 이때 냉각시간은 5초로 하였으며 용액 분사 압력은 순수 3kg/C㎡, 공기 4.5kg/C㎡ 이었으며, 공냉 방식은 풍압 300mmH2O로 실시하였다.0.7t steel plate of 300mm width was transferred at a speed of 10m per minute, followed by annealing heat treatment in a reducing atmosphere, and then passing the steel plate through a hot dip galvanizing port containing 0.14% by weight of Al. Controlled at 60 g / m 2. After that, an alloying heat treatment was performed at 600 ° C., and the steel sheet was cooled by the cooling method shown in Table 1 below. At this time, the cooling time was 5 seconds, the solution injection pressure was 3kg / C ㎡ pure water, 4.5kg / C ㎡ air, air-cooling was carried out with a wind pressure of 300mmH 2 O.
상기 방법에 의하여 냉각된 강판의 형상을 검사하여 강판의 표면에 굴곡이 발생하였는지 하기 표2에 나타내었으며, 탑롤에 도착한 강판의 온도를 측정하여 하기 표2에 나타내었다.Examining the shape of the steel sheet cooled by the above method is shown in Table 2 whether the bending occurs on the surface of the steel sheet, and the temperature of the steel sheet to reach the top roll was measured and shown in Table 2 below.
본 발명의 발명예1은 냉각 후에 표면굴곡이 없는 양호한 강판의 표면 형상을 확보할 수 있었으며, 탑롤에서의 강판 온도는 290℃로 탑롤에서 도금층이 탈락하지 않았음을 알 수 있다. 반면에, 비교예1은 고전압대전 없이 수냉한 것으로서, 탑 롤에서의 강판온도가 295℃로 탑롤에 도금층이 부착되지 않는 양호한 결과를 얻었으나, 냉각시 강판 부위별로 온도편차가 크게 발생하여 강판의 표면에 굴곡이 발생하였음을 알 수 있다. 또한, 비교예2는 공냉방식으로 강판을 냉각한 것으로서, 강판의 표면에 굴곡이 발생하고 탑롤에서의 강판 온도가 350℃로 도금층이 탈락하였음을 알 수 있다.Inventive Example 1 of the present invention was able to secure the surface shape of a good steel sheet without surface bending after cooling, it can be seen that the steel plate temperature in the top roll is 290 ℃, the plating layer did not fall off the top roll. On the other hand, Comparative Example 1 was water-cooled without high voltage charge, and the steel sheet temperature at the top roll was 295 ° C., which resulted in a good result that the plated layer was not attached to the top roll. It can be seen that bending occurred on the surface. In Comparative Example 2, the steel sheet was cooled by an air cooling method, and it was found that bending occurred on the surface of the steel sheet and the plated layer was dropped to 350 ° C. at the top roll.
(실시예2)Example 2
폭이 300mm인 0.7t의 강판을 분당 10m의 속도로 이송시켜서 환원성 분위기에서 소둔 열처리한 후 상기 강판을 Al 0.14중량% 함유된 용융아연도금 포트를 통과시킨 후 에어나이프에 의해 아연도금 부착량을 한면당 60g/㎡로 제어하였다. 이 후 600℃에서 합금화 열처리를 실시하고 하기 표2에 기재된 냉각방법 및 수용액에 의하여 상기 강판을 냉각시켰다. 또한, 인산염으로는 제일인산암모늄을 사용하였으며, 산화제로는 과산화수소를 사용하였다. 0.7t steel plate of 300mm width was transferred at a speed of 10m per minute, followed by annealing heat treatment in a reducing atmosphere, and then passing the steel plate through a hot dip galvanizing port containing 0.14% by weight of Al. Controlled at 60 g / m 2. After that, an alloying heat treatment was performed at 600 ° C., and the steel sheet was cooled by the cooling method and the aqueous solution shown in Table 2 below. In addition, ammonium monophosphate was used as a phosphate, and hydrogen peroxide was used as an oxidizing agent.
비교예3 내지 6을 통해보면, 고전압을 인가하지 않을 경우에는 강판에 굴곡이 발생하는 문제점이 있으며, 탈롤에서의 강판 온도도 고전압을 인가할 때보다 높았다. 이는 고전압에 의해 분사 균일성 뿐만아니라 액적의 강판 부착효율이 향상되기 때문이며, 이는 피막 부착량을 비교해 보면 알 수 있다. 발명예2와 비교예3을 비교하여 보면, 동일한 0.1%의 인산염 농도를 갖는 수용액을 사용하지만, P의 부착량이 1mg/㎡과 10mg/㎡으로 크게 차이가 남을 확인할 수 있다.Through Comparative Examples 3 to 6, when the high voltage is not applied, there is a problem that bending occurs in the steel sheet, and the temperature of the steel sheet in the tallow is higher than when the high voltage is applied. This is because not only the spray uniformity but also the steel sheet adhesion efficiency of the droplets are improved by the high voltage, which can be seen by comparing the film deposition amount. Comparing Inventive Example 2 with Comparative Example 3, although an aqueous solution having the same phosphate concentration of 0.1% is used, it can be seen that the adhesion amount of P remains largely different at 1 mg / m 2 and 10 mg / m 2.
도1은 본 발명의 일실시예를 포함한 합금화 용융아연도금강판의 제조과정의 일부를 나타내는 모식도이다.Figure 1 is a schematic diagram showing a part of the manufacturing process of the alloyed hot-dip galvanized steel sheet including an embodiment of the present invention.
<도면의 주요한 도면부호><Main reference numerals in the drawings>
1. 도금포트, 2. 에어나이프,1. Plating port, 2. Air knife,
3. 합금화로, 4. 균열로(fixed soaking furnace),3. alloying furnace, 4. fixed soaking furnace,
5. 냉각장치(5a, 5b, 5c), 6. 탑롤.5.
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| KR20000037538A (en) * | 1998-12-01 | 2000-07-05 | 이구택 | Method of manufacturing molten galvanized steel sheet excellent in zn pickup resistance and phosphating |
| KR20020053633A (en) * | 2000-12-27 | 2002-07-05 | 이구택 | Method and apparatus for cooling the zinc plated steel |
| KR100415677B1 (en) * | 1999-12-28 | 2004-01-31 | 주식회사 포스코 | A Method for Producing Spangle Free Hot Dip Galvanizing Steel Sheet |
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| KR20000037538A (en) * | 1998-12-01 | 2000-07-05 | 이구택 | Method of manufacturing molten galvanized steel sheet excellent in zn pickup resistance and phosphating |
| KR100415677B1 (en) * | 1999-12-28 | 2004-01-31 | 주식회사 포스코 | A Method for Producing Spangle Free Hot Dip Galvanizing Steel Sheet |
| KR20020053633A (en) * | 2000-12-27 | 2002-07-05 | 이구택 | Method and apparatus for cooling the zinc plated steel |
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