KR20030052753A - Manufacturing method of galvanized sheet steels with high strength - Google Patents
Manufacturing method of galvanized sheet steels with high strength Download PDFInfo
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- KR20030052753A KR20030052753A KR1020010082781A KR20010082781A KR20030052753A KR 20030052753 A KR20030052753 A KR 20030052753A KR 1020010082781 A KR1020010082781 A KR 1020010082781A KR 20010082781 A KR20010082781 A KR 20010082781A KR 20030052753 A KR20030052753 A KR 20030052753A
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- steel sheet
- galvanized steel
- high strength
- manufacturing
- strip
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 31
- 239000010959 steel Substances 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 229910001335 Galvanized steel Inorganic materials 0.000 claims abstract description 29
- 239000008397 galvanized steel Substances 0.000 claims abstract description 29
- 238000007747 plating Methods 0.000 claims abstract description 25
- 239000011572 manganese Substances 0.000 claims abstract description 24
- 239000010410 layer Substances 0.000 claims abstract description 23
- 238000000137 annealing Methods 0.000 claims abstract description 18
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 17
- 239000010703 silicon Substances 0.000 claims abstract description 17
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 14
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000011701 zinc Substances 0.000 claims abstract description 11
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 11
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 239000011574 phosphorus Substances 0.000 claims abstract description 8
- 210000004894 snout Anatomy 0.000 claims abstract description 6
- 230000001678 irradiating effect Effects 0.000 claims abstract description 4
- 239000002344 surface layer Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 abstract description 15
- 239000011248 coating agent Substances 0.000 abstract description 2
- 238000000576 coating method Methods 0.000 abstract description 2
- 239000011247 coating layer Substances 0.000 abstract 3
- 238000007598 dipping method Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- 229910052742 iron Inorganic materials 0.000 description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000005275 alloying Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000003287 bathing Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000037396 body weight Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000010438 heat treatment Methods 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
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
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
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
-
- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/002—Pretreatement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
- B23K26/356—Working by laser beam, e.g. welding, cutting or boring for surface treatment by shock processing
-
- 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
- C23C2/34—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
Description
본 발명은 실리콘을 함유한 용융아연도금강판의 제조방법에 관한 것이며, 특히, 레이저를 이용하여 표층에 형성된 산화물을 파괴하는 방법을 이용하여 용융아연도금강판을 도금하는 방법에 관한 것이다.The present invention relates to a method for manufacturing a hot-dip galvanized steel sheet containing silicon, and more particularly, to a method for plating a hot-dip galvanized steel sheet using a method of destroying oxides formed on a surface layer using a laser.
용융아연도금강판은 저렴한 비용과 내식성 때문에 자동차 차체에 주로 사용되고 있으며, 현재 자동차 차체경량화의 요구가 증대되고 있어 고강도 용융아연도금강판의 사용이 증가하고 있다. 용융아연도금강판의 제조공정은 통상 연속소둔로를 통과하여 용융아연 욕조를 통과하고, 아연도금된 강판을 에어나이프를 이용하여 도금부착량을 조절하여 제조하게 된다.Hot-dip galvanized steel sheet is mainly used in automobile bodies because of low cost and corrosion resistance, and the demand for high-strength automobile body weight is increasing and the use of high strength hot-dip galvanized steel sheet is increasing. In the manufacturing process of the hot-dip galvanized steel sheet is usually passed through the continuous annealing furnace and passed through the hot-dip zinc bath, the galvanized steel sheet is produced by adjusting the coating amount by using an air knife.
그러나, 고강도 강을 제조하기 위해서는 실리콘(Si), 망간(Mn), 인(P) 등을 다량첨가하여 강도를 증가시키고 있다. 이러한 원소를 함유한 강은 소둔로에서 700~900℃의 고온에서 재결정화 열처리를 하여 우수한 기계적 성질을 얻는다. 용융도금라인에서 소둔로의 분위기는 수소와 질소가 혼합되어 있으며, 이 분위기는 철에 대해서는 환원성 분위기이지만, 실리콘, 망간 및 인과 같은 몇 가지 원소에 대해서는 산화성 분위기이다. 따라서, 철보다 더 산화성인 실리콘(Si), 망간(Mn), 인(P) 등은 소둔시 강판의 표면상에서 산소와 결합하여 1㎛이하의 얇은 산화피막층을 형성하게 된다. 이렇게 형성된 산화피막층은 용융아연과의 젖음성이 매우 안좋기 때문에, 용융아연이 강판의 표층에 피복되지 않고 미도금이 발생하는 단점이 있다. 이러한 원인으로 인하여 강 중의 실리콘이나 망간 등은 그 함량이 엄격히 제한되고 있다.However, in order to manufacture high strength steel, silicon (Si), manganese (Mn), phosphorus (P), and the like are added in large amounts to increase the strength. Steels containing these elements are subjected to recrystallization heat treatment at a high temperature of 700 to 900 ° C. in an annealing furnace to obtain excellent mechanical properties. The atmosphere of the annealing furnace in the hot dip plating line is a mixture of hydrogen and nitrogen, which is a reducing atmosphere for iron but an oxidizing atmosphere for some elements such as silicon, manganese and phosphorus. Therefore, silicon (Si), manganese (Mn), phosphorus (P), etc., which are more oxidative than iron, combine with oxygen on the surface of the steel sheet during annealing to form a thin oxide film layer having a thickness of 1 µm or less. Since the oxide layer formed in this way has a very poor wettability with molten zinc, there is a disadvantage in that the molten zinc is not coated on the surface layer of the steel sheet and unplating occurs. Due to this cause, the content of silicon or manganese in steel is strictly limited.
이러한 문제점을 보완하기 위하여 일본 특허공개공보 평4-333552호, 소61-9386호에는 도금전에 니켈을 예비처리하는 방법을 제안하고 있다. 그러나, 일반적으로 연속도금라인에는 니켈을 예비처리하는 설비가 없고, 10g/m2이상의 Ni이 필요하기 때문에 비용증가가 초래되며, 사용된 용액의 처리문제가 발생할 뿐만 아니라, 설비 등을 개조하는데 큰 투자비가 요구된다.To solve this problem, Japanese Patent Laid-Open Nos. 4-333552 and 61-9386 propose a method of pretreating nickel before plating. However, in general, continuous plating lines do not have a facility for pretreatment with nickel, and require more than 10 g / m 2 of Ni, which leads to an increase in cost, and not only a problem of treating the used solution, but also a great renovation of the facility. Investment costs are required.
다른 방법으로는 일본 특허공개공보 소55-122865호, 평4-254531호 등이 제안되고 있다. 이들 방법은 강판을 미리 산화시켜 강판의 표면상에 철산화물을 형성한 다음 환원처리하는 것이다. 그러나, 이들 방법에 따르면 실리콘과 같은 합금원소가 표면에서 분리되어 환원처리 중에 과도한 환원 때문에 산화물막이 형성되며 열악한 도금의 문제를 야기하는 단점이 있다.As another method, Japanese Patent Laid-Open Nos. 55-122865 and 4-254531 have been proposed. These methods involve oxidizing the steel sheet in advance to form iron oxide on the surface of the steel sheet, followed by reduction treatment. However, these methods have disadvantages in that an alloying element such as silicon is separated from the surface, an oxide film is formed due to excessive reduction during the reduction treatment, and causes a problem of poor plating.
도 1은 종래기술에 따른 고강도 용융아연도금강판의 제조과정을 도시한 개략도이다. 도 1에 도시된 바와 같이, 종래의 용융아연도금강판의 제조방법은 강판(1)이 700~900℃의 소둔로(3)를 통과하여 5~15%수소와 질소의 환원성 분위기에서 열처리된다. 이 때, 환원성 분위기는 철에 대해서는 환원성이지만, 실리콘이나 망간에 대해서는 산화성 분위기가 되므로, 실리콘이나 망간 등이 강판의 표층에 부착되어 산화피막층을 형성하게 된다. 이렇게 산화피막층이 형성된 강판은 아연욕조(6)를 통과하여 도금이 되는데, 도금하기 전 소둔로에서 생성된 표층의 산화피막으로 인하여 미도금이 발생하고 도금밀착성도 열화되는 단점이 있다. 도 1에서 미설명부호 2는 패이오프 릴(pay-off reel), 4는 스나우트(snout), 5는 싱크롤, 7은 에어나이프, 8은 탑롤(top roll)을 각각 나타낸다.1 is a schematic diagram showing a manufacturing process of a high strength hot dip galvanized steel sheet according to the prior art. As shown in FIG. 1, in the conventional method for manufacturing a hot-dip galvanized steel sheet, the steel sheet 1 passes through an annealing furnace 3 at 700 to 900 ° C., and is heat-treated in a reducing atmosphere of 5 to 15% hydrogen and nitrogen. At this time, the reducing atmosphere is reducing for iron, but becomes an oxidizing atmosphere for silicon and manganese, so that silicon, manganese and the like adhere to the surface layer of the steel sheet to form an oxide film layer. The steel sheet formed with the oxide film layer is plated by passing through the zinc bath (6), but due to the oxide film of the surface layer generated in the annealing furnace before plating, there is a disadvantage in that unplating occurs and plating adhesion is also degraded. In FIG. 1, reference numeral 2 denotes a pay-off reel, 4 denotes a snout, 5 denotes a sink roll, 7 denotes an air knife, and 8 denotes a top roll.
따라서, 본 발명은 앞서 설명한 바와 같은 종래기술의 문제점을 해결하기 위하여 안출된 것으로서, 기존의 용융아연도금강판의 특성을 유지하면서 강 중에 도금이 어려운 원소가 포함되더라도 표층에 형성되는 산화피막층을 파괴함으로써 도금밀착성이 우수한 용융아연도금강판의 제조방법을 제공하는 데 그 목적이 있다.Accordingly, the present invention has been made to solve the problems of the prior art as described above, by destroying the oxide film layer formed on the surface layer even if the steel contains elements difficult to plate while maintaining the characteristics of the existing hot-dip galvanized steel sheet An object of the present invention is to provide a method for manufacturing a hot-dip galvanized steel sheet having excellent plating adhesion.
도 1은 종래기술에 따른 고강도 용융아연도금강판의 제조과정을 도시한 개략도이고,1 is a schematic diagram showing a manufacturing process of a high strength hot dip galvanized steel sheet according to the prior art,
도 2는 본 발명의 한 실시예에 따른 고강도 용융아연도금강판의 제조과정을 도시한 개략도이며,Figure 2 is a schematic diagram showing the manufacturing process of high strength hot-dip galvanized steel sheet according to an embodiment of the present invention,
도 3은 종래기술에 따른 방법과 본 발명에 따른 방법에 의해 각각 형성된 도금전 소지철의 표층상태를 개략적으로 비교 도시한 도면이다.Figure 3 is a schematic comparison of the surface state of the before-plated base iron, respectively formed by the method according to the prior art and the method according to the present invention.
♠ 도면의 주요부분에 대한 부호의 설명 ♠♠ Explanation of symbols on the main parts of the drawing ♠
1 : 강판 2 : 패이오프 릴1: steel sheet 2: pay-off reel
3 : 소둔로 4 : 스나우트3: annealing furnace 4: snout
5 : 싱크롤 6 : 아연욕조5: sink roll 6: zinc bath
7 : 에어나이프 8 : 탑롤7: air knife 8: top roll
9 : 레이저 장치9: laser device
상기 목적을 달성하기 위한 본 발명에 따르면, 적어도 실리콘(Si), 망간(Mn) 및 인(P)을 함유한 고강도 강판으로 용융아연도금강판을 제조하는 방법에 있어서, 상기 강판을 소둔로를 통과시켜 소둔하는 단계와, 상기 소둔로에서 실리콘(Si)이나 망간(Mn)에 의해 생긴 표층의 산화피막층을 레이저를 조사하여 국부적으로 파괴하는 단계와, 상기 산화피막층이 국부 파괴된 강판을 아연욕조에 입욕하여 도금하는 단계를 포함하는 것을 특징으로 하는 고강도 용융아연도금강판의 제조방법이 제공된다.According to the present invention for achieving the above object, in the method for producing a hot-dip galvanized steel sheet from a high strength steel sheet containing at least silicon (Si), manganese (Mn) and phosphorus (P), passing the steel sheet through an annealing furnace And annealing, locally irradiating the oxide layer of the surface layer formed by silicon (Si) or manganese (Mn) in the annealing furnace by irradiating with a laser, and decomposing the steel sheet in which the oxide layer is locally destroyed in a zinc bath. Provided is a method for producing a high strength hot dip galvanized steel sheet comprising bathing and plating.
아래에서, 본 발명에 따른 고강도 용융아연도금강판의 제조방법의 양호한 실시예를 첨부한 도면을 참조로 하여 상세히 설명하겠다.In the following, with reference to the accompanying drawings a preferred embodiment of a method for producing a high strength hot dip galvanized steel sheet according to the present invention will be described in detail.
본 발명의 제조방법은, 레이저 장치를 통해 산화피막층을 제거한다는 것을 제외하고는 종래의 방법과 동일하다. 그러므로, 동일한 구성요소들에 대해서는 동일한 도면부호가 부여될 것이며, 이들에 대한 설명은 여기서 생략하기로 한다.The manufacturing method of the present invention is the same as the conventional method except that the oxide layer is removed through a laser device. Therefore, like reference numerals refer to like elements, and descriptions thereof will be omitted herein.
도 2는 본 발명의 한 실시예에 따른 고강도 용융아연도금강판의 제조과정을 도시한 개략도이다.Figure 2 is a schematic diagram showing the manufacturing process of high strength hot-dip galvanized steel sheet according to an embodiment of the present invention.
본 발명은 레이저 장치(9)를 스나우트(4 ; snout)부분에 설치하여 소둔로(3)에서 실리콘이나 망간에 의해 생긴 표층의 산화피막층을 파괴함으로써, 도금밀착성이 우수한 고강도 용융아연도금강판을 제조하려는 것이다. 즉, 본 발명은 종래의 스나우트(4)부분에 레이저 장치(9)를 설치하여, 강판(1)의 표층에 조사함으로써 소둔로(3)에서 강판(1)의 표층에 생성된 산화피막층을 파괴시키는 것이다.The present invention provides a high-strength hot-dip galvanized steel sheet having excellent plating adhesion by providing a laser device 9 in the snout portion 4 to destroy the oxide layer of the surface layer formed by silicon or manganese in the annealing furnace 3. To manufacture. That is, according to the present invention, the laser device 9 is provided in the conventional snout 4 portion, and the oxide layer formed on the surface layer of the steel sheet 1 in the annealing furnace 3 is irradiated on the surface layer of the steel sheet 1. To destroy.
도 3은 종래기술에 따른 방법과 본 발명에 따른 방법에 의해 각각 형성된 도금전 소지철의 표층상태를 개략적으로 비교 도시한 도면이다. 종래의 경우 산화피막층이 존재하게 됨으로써 도금이 되지 않는 문제점이 있으나[(a) 종래예]??레이저 장치(9)를 이용하여 산화피막층을 파괴하면 산화피막층에 미세한 균열이 발생하게 된다[(b) 발명예]. 이렇게 균열이 발생한 강판을 아연욕조(6)에 입욕하면, 용융아연이 균열부분에 침투하여 도금밀착성을 향상시킴으로써, 고강도 용융아연도금강판을 제조할 수 있게 되는 것이다.Figure 3 is a schematic comparison of the surface state of the before-plated base iron, respectively formed by the method according to the prior art and the method according to the present invention. In the conventional case, there is a problem in that the plating layer is not formed by the presence of the oxide layer [(a) Conventional Example] When the oxide layer is destroyed by using the laser device 9, minute cracking occurs in the oxide layer [(b ) Invention example]. When the steel sheet in which the crack has been generated is bathed in the zinc bath 6, the molten zinc penetrates into the crack portion and improves the plating adhesion, thereby making it possible to manufacture a high strength hot dip galvanized steel sheet.
이 때, 중요한 점은 레이저의 출력을 잘 조정해주어야 한다. 그래서, 본 출원인은 다수의 실험을 통해 레이저의 출력을 1~100kW 범위 내에서 하는 것이 가장 바람직함을 확인하였다. 즉, 1kW 이하의 경우에는 레이저의 출력이 약하여 강판의 표층에 형성된 산화피막층의 균열을 일으킬 수 없고, 100kW 이상의 경우에는 레이저의 출력이 너무 커서 소지철의 표층뿐 만 아니라 소지철의 내부까지 레이저가 침투하여 기계적 성질이 열화되는 것을 확인할 수 있었다.At this point, it is important to adjust the power of the laser well. Thus, the Applicant has confirmed that it is most preferable to make the output of the laser within the range of 1 ~ 100kW through a number of experiments. In other words, when the power is 1 kW or less, the laser output is weak to prevent cracking of the oxide layer formed on the surface of the steel sheet. When the power is 100 kW or more, the laser output is so large that not only the surface of steel but also the inside of the steel It was confirmed that the mechanical properties deteriorate due to penetration.
아래에서는, 본 출원인이 실험한 실험예를 통하여 본 발명을 더욱 상세히 설명하겠다.In the following, the present invention will be described in more detail through the experimental example experimented by the applicant.
<실험예>Experimental Example
실리콘(Si) 0.1~3wt%, 망간(Mn) 0.05~3wt%, 인(P) 0.001~0.5wt%의 원소가 포함된 강판을 레이저 장치의 출력을 조절하여 용융아연도금강판을 제조하였다. 상기와 같이 도금처리된 시편에 대하여 표면외관, 도금밀착성을 평가하고 그 결과를 표 2에 나타냈다. 도금부착량은 편면 90g/㎡으로 하였다.A hot-dip galvanized steel sheet was manufactured by controlling the output of a laser device on a steel sheet containing 0.1 to 3 wt% of silicon (Si), 0.05 to 3 wt% of manganese (Mn), and 0.001 to 0.5 wt% of phosphorus (P). The surface appearance and plating adhesion of the specimens plated as described above were evaluated and the results are shown in Table 2. The plating adhesion amount was set to 90 g / m 2 of one side.
표 2에서, 표면외관은 육안관찰한 것으로서, ◎는 미도금부 전혀 없음, △는 미도금부 미량 발생, X는 미도금부 다량 발생함을 각각 의미한다. 그리고, 도금밀착성은 제로티 밴딩(0-t Bending)을 하여, "1(도금박리 없음) ←도금박리지수 →5(도금박리 심함)"을 나타낸다. 그리고, 표 2의 강기호는 표 1과 같은 강성분을 각각 갖는다.In Table 2, the surface appearance is visually observed, ◎ means no unplated portion, △ means a small amount of unplated portion, X means a large amount of unplated portion, respectively. In addition, the plating adhesiveness is zero t bending, and represents "1 (no plating peeling) ← plating peeling index → 5 (deep plating peeling)". And the steel symbol of Table 2 has the steel components of Table 1, respectively.
표 2에서와 같이 강판의 강도를 증가시키는 원소인 실리콘(Si), 망간(Mn), 인(P) 등이 함유된 강판을 용융아연 도금함에 있어, 기존의 방법으로 제조할 경우에는 소지철의 표층에 산화피막층이 존재하여 미도금이 발생할 뿐만 아니라 도금밀착성도 현저히 떨어지는 것을 알 수 있다(기존예).As shown in Table 2, when hot-dip galvanizing steel sheets containing silicon (Si), manganese (Mn), phosphorus (P), etc., elements that increase the strength of the steel sheet, It can be seen that the presence of an oxide layer on the surface layer not only causes unplating but also significantly reduced plating adhesion (existing example).
그러나, 본 발명에서와 같이 레이저 장치를 이용하여 산화피막층에 균열을 발생시키면 레이저출력이 1~100kW의 경우에는 표면외관뿐만 아니라 도금밀착성이 양호한 결과를 얻을 수 있다(발명예). 그러나, 1kW이하의 경우 레이저의 출력이 약하여 소지철의 표층에 존재하는 산화피막층에 균열을 일으키지 못하므로 기존의 방법에서와 마찬가지 결과를 나타내었다. 또한, 레이저의 출력이 100kW이상일 경우에는 산화피막층의 균열뿐만 아니라 소지철에도 영향을 미쳐 표면외관이 열화되고 기계적 성질측면에서도 열화되는 성질을 나타내었다.However, when a crack is generated in the oxide layer using a laser device as in the present invention, when the laser power is 1 to 100 kW, not only the surface appearance but also the plating adhesion can be obtained (invention example). However, in the case of less than 1kW, the output of the laser is weak, so that it does not cause cracks in the oxide layer existing on the surface of the base iron. In addition, when the output of the laser is more than 100kW, not only the crack of the oxide film layer but also the base iron affected the surface appearance and deteriorated in terms of mechanical properties.
앞서 상세히 설명한 바와 같이 본 발명의 방법은 레이저 장치를 이용하여 산화피막층에 균열을 발생시킨 상태에서 아연도금함으로, 표면외관이 우수하고 도금밀착성이 우수한 고강도 용융아연도금강판을 제조하는 효과가 있다.As described in detail above, the method of the present invention has the effect of producing a high strength hot dip galvanized steel sheet having excellent surface appearance and excellent plating adhesion by zinc plating in a state where cracks are generated in the oxide layer using a laser device.
이상에서 본 발명의 고강도 용융아연도금강판의 제조방법에 대한 기술사항을 첨부도면과 함께 서술하였지만 이는 본 발명의 가장 양호한 실시예를 예시적으로 설명한 것이지 본 발명을 한정하는 것은 아니다.Although the technical details of the method for manufacturing a high strength hot-dip galvanized steel sheet of the present invention have been described together with the accompanying drawings, this is illustrative of the best embodiments of the present invention and is not intended to limit the present invention.
또한, 이 기술분야의 통상의 지식을 가진 자이면 누구나 본 발명의 기술사상의 범주를 이탈하지 않고 첨부한 특허청구의 범위내에서 다양한 변형 및 모방이 가능함은 명백한 사실이다.In addition, it is obvious that any person skilled in the art can make various modifications and imitations within the scope of the appended claims without departing from the scope of the technical idea of the present invention.
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| KR101538217B1 (en) * | 2013-08-13 | 2015-07-22 | 원광대학교산학협력단 | Pharmaceutical Composition for Inhibition of Osteoclastogenesis and Bone Resorption |
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| KR101538217B1 (en) * | 2013-08-13 | 2015-07-22 | 원광대학교산학협력단 | Pharmaceutical Composition for Inhibition of Osteoclastogenesis and Bone Resorption |
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