KR101591982B1 - METHOD FOR MANUFACTURING Al-Zn BASED HOT DIP PLATED STEEL SHEET HAVING EXCELLENT SURFACE APPEARANCE AND PAINTABILITY - Google Patents
METHOD FOR MANUFACTURING Al-Zn BASED HOT DIP PLATED STEEL SHEET HAVING EXCELLENT SURFACE APPEARANCE AND PAINTABILITY Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 60
- 239000010959 steel Substances 0.000 title claims abstract description 60
- 229910018137 Al-Zn Inorganic materials 0.000 title claims abstract description 57
- 229910018573 Al—Zn Inorganic materials 0.000 title claims abstract description 57
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000007747 plating Methods 0.000 claims abstract description 44
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000001816 cooling Methods 0.000 claims abstract description 19
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 6
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 claims abstract description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 239000010703 silicon Substances 0.000 claims abstract description 5
- 239000002245 particle Substances 0.000 claims description 13
- 239000007789 gas Substances 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 230000008021 deposition Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 5
- 238000007598 dipping method Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 10
- 238000005507 spraying Methods 0.000 description 8
- 230000007547 defect Effects 0.000 description 6
- 238000007711 solidification Methods 0.000 description 6
- 230000008023 solidification Effects 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 238000009500 colour coating Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- 230000006911 nucleation Effects 0.000 description 3
- 238000010899 nucleation Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- LLQHSBBZNDXTIV-UHFFFAOYSA-N 6-[5-[[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]methyl]-4,5-dihydro-1,2-oxazol-3-yl]-3H-1,3-benzoxazol-2-one Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)CC1CC(=NO1)C1=CC2=C(NC(O2)=O)C=C1 LLQHSBBZNDXTIV-UHFFFAOYSA-N 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000010731 rolling oil Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- C23C2/26—After-treatment
- C23C2/265—After-treatment by applying solid particles to the molten coating
-
- 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
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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
- C23C2/12—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
- C23C2/14—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
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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
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
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- Oil, Petroleum & Natural Gas (AREA)
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- Coating With Molten Metal (AREA)
Abstract
Description
본 발명은 표면외관 및 도장성이 우수한 Al-Zn계 도금강판을 제조하는 방법에 관한 것이다.
The present invention relates to a method for producing an Al-Zn-based plated steel sheet excellent in surface appearance and paintability.
용융 Al-Zn계 도금강판, 예를 들면, 용융 55%Al-Zn 도금강판은 알루미늄 도금이 지니는 내식성, 내열성 및 열반사성과 아연도금이 지니는 희생방식효과를 동시에 갖추고 있기 때문에, 통상의 Zn 도금강판 대비 동일 환경에서 내식성이 3배 내지 6배 정도 우수한 것으로 알려져 있으며, 따라서, 건축 판넬재, 지붕재, 농업 설비 및 전자제품의 프레임 등으로 다양하게 사용되고 있다.
Since the molten Al-Zn-based plated steel sheet, for example, the molten 55% Al-Zn plated steel sheet has both the corrosion resistance and heat resistance of aluminum plating, and the sacrificial effect effect of heat reflection and galvanization, It is known that corrosion resistance is about 3 to 6 times better in the same environment, and thus it is widely used as a frame for building panel material, roofing material, agricultural equipment, and electronic products.
그런데, 용융 Al-Zn계 도금강판과 같이, 도금층 내 2 이상의 성분을 포함하는 용융 도금강판은, 도금층 내 각 성분들의 냉각속도 차이로 인하여 그 표면에 스팽글(spangle)이라는 무늬가 형성되며, 이로 인해 표면결함이 발생하고, 도장성이 열화되는 문제가 있다.
However, in the case of the hot-dip coated steel sheet including two or more components in the plated layer as in the case of the molten Al-Zn-based coated steel sheet, a pattern called a spangle is formed on the surface thereof due to the difference in cooling rates of the respective components in the plated layer, Surface defects are generated and coating properties are deteriorated.
이와 관련하여, 특허문헌 1에는 용융 Al-Zn계 도금강판의 제조에 있어서 도금욕 내 적정량의 Ti 금속 원소를 포함하도록 하여 스팽글 무늬의 형성을 억제하는 기술이 개시되어 있다. 그러나, 상기 기술은 도금욕 내 Ti 용융을 위한 추가적인 설비를 요할 뿐만 아니라, 도금욕 내 Ti 함량을 적절하게 유지하기 위하여 지속적인 관리를 요하는 불편이 있었다.
In this connection, Patent Document 1 discloses a technique for suppressing the formation of a sequin pattern by including a Ti metal element in a proper amount in a plating bath in the production of a molten Al-Zn-based plated steel sheet. However, the above-mentioned technique requires additional equipment for Ti melting in the plating bath, and there is an inconvenience that continuous maintenance is required to maintain the Ti content in the plating bath appropriately.
본 발명의 일 측면은, 표면외관 및 도장성이 우수한 Al-Zn계 도금강판을 제조하는 방법을 제공하는 것이다.
An aspect of the present invention is to provide a method for producing an Al-Zn-based plated steel sheet excellent in surface appearance and paintability.
상기와 같은 목적을 달성하기 위하여, 본 발명의 일 측면인 표면외관 및 도장성이 우수한 용융 Al-Zn계 도금강판의 제조방법은, 중량%로, 아연(Zn): 35~55%, 실리콘(Si): 0.5~3.0%, 잔부 알루미늄(Al) 및 불가피한 불순물을 포함하는 Al-Zn계 도금욕을 준비하는 단계; 상기 Al-Zn계 도금욕에 소지강판을 침지하고, 도금을 행하여 용융 Al-Zn계 도금강판을 제조하는 단계; 및 상기 용융 Al-Zn계 도금강판을 냉각하는 단계를 포함하며, 상기 냉각시, 용융 Al-Zn계 도금강판의 표면에 입자 크기가 18~32㎛인 알루미늄 분말을 40~80g/m2/min의 속도로 분사하는 것을 특징으로 한다.
In order to achieve the above object, a method of manufacturing a molten Al-Zn-based plated steel sheet excellent in surface appearance and paintability according to one aspect of the present invention comprises 35 to 55% of zinc (Zn) Si): 0.5 to 3.0%, the remainder aluminum (Al), and unavoidable impurities; Immersing a base steel sheet in the Al-Zn base plating bath and performing plating to produce a molten Al-Zn base plated steel sheet; And cooling the molten Al-Zn-based coated steel sheet, wherein, at the time of cooling, an aluminum powder having a particle size of 18 to 32 탆 is coated on the surface of the molten Al-Zn-based coated steel sheet at a rate of 40 to 80 g / m 2 / min Of the spraying rate.
덧붙여, 상기한 과제의 해결 수단은, 본 발명의 특징을 모두 열거한 것은 아니다. 본 발명의 다양한 특징과 그에 따른 장점 및 효과는 하기의 구체적인 실시형태를 참조하여 보다 상세하게 이해될 수 있을 것이다.
In addition, the solution of the above-mentioned problems does not list all the features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS The various features and advantages and effects of the present invention will become more fully understood with reference to the following specific embodiments.
본 발명에 따르면, 도금층 표면의 스팽글의 평균입경이 1.0mm 미만으로 제어되어 표면외관이 매우 우수할 뿐만 아니라, 도장성이 매우 우수한 용융 Al-Zn계 도금강판을 제공할 수 있다.
According to the present invention, it is possible to provide a molten Al-Zn-based plated steel sheet excellent in surface appearance as well as excellent paintability, by controlling the average grain size of the sequins on the surface of the plating layer to be less than 1.0 mm.
도 1의 (a)는 발명예 1에 따른 용융 Al-Zn계 도금강판의 표면을 관찰하여 나타낸 것이다.
도 1의 (b)는 발명예 1에 따른 용융 Al-Zn계 도금강판을 컬러 도장한 후, 그 표면을 관찰하여 나타낸 것이다.
도 2의 (a)는 비교예 1에 따른 용융 Al-Zn계 도금강판의 표면을 관찰하여 나타낸 것이다.
도 2의 (b)는 비교예 1에 따른 용융 Al-Zn계 도금강판을 컬러 도장한 후, 그 표면을 관찰하여 나타낸 것이다.1 (a) is a view showing the surface of a molten Al-Zn-based plated steel sheet according to Inventive Example 1.
Fig. 1 (b) shows the surface of the molten Al-Zn-based plated steel sheet according to Inventive Example 1 after color coating.
2 (a) is a view showing the surface of the molten Al-Zn-based plated steel sheet according to Comparative Example 1. FIG.
Fig. 2 (b) shows the surface of the molten Al-Zn-based plated steel sheet according to Comparative Example 1 after color coating.
이하, 본 발명에 대하여 상세히 설명한다.
Hereinafter, the present invention will be described in detail.
먼저, 본 발명에 이용되는 Al-Zn계 도금욕에 대하여 상세히 설명한다.First, the Al-Zn system plating bath used in the present invention will be described in detail.
본 발명에 이용되는 Al-Zn계 도금욕은 중량%로, 아연(Zn): 35~55%, 실리콘(Si): 0.5~3.0%, 잔부 알루미늄(Al) 및 불가피한 불순물을 포함할 수 있다.
The Al-Zn based plating bath used in the present invention may contain 35 to 55% of zinc (Zn), 0.5 to 3.0% of silicon (Si), aluminum (Al) and unavoidable impurities in weight%.
상기 Zn은 희생방식성을 가져 도금층의 부식을 방지하는 역할을 한다. 만약, 상기 Zn의 함량이 35중량% 미만인 경우에는 도금욕 온도가 상승하며, 이로 인해 도금욕 내 드로스의 증가와 함께 작업성이 저하되게 된다. 반면, 55중량%를 초과하는 경우에는 도금강판의 비중 증가로 원가가 상승하며, 경제성이 저하되게 된다. 따라서, 상기 Zn의 함량은 35~55중량%인 것이 바람직하고, 41.4~45.4중량%인 것이 보다 바람직하다.
The Zn has sacrificial corrosion resistance and serves to prevent corrosion of the plating layer. If the content of Zn is less than 35% by weight, the plating bath temperature rises and the workability decreases with the increase of the dross in the plating bath. On the other hand, if it exceeds 55% by weight, the cost increases due to the increase of the specific gravity of the coated steel sheet, and the economical efficiency is lowered. Therefore, the content of Zn is preferably 35 to 55 wt%, and more preferably 41.4 to 45.4 wt%.
상기 Si는 소지강판과 도금층의 계면에서 형성되는 합금층의 형성을 억제하는 역할을 한다. 본 발명에서 이러한 효과를 확보하기 위해서는 상기 Si를 0.5중량% 이상 첨가함이 바람직하다. 반면, 3중량%를 초과하는 경우에는 그 효과가 포화되므로, 상기 Si의 함량은 0.5~3중량%인 것이 바람직하고, 1.4~1.8중량%인 것이 보다 바람직하다.
The Si serves to suppress the formation of an alloy layer formed at the interface between the base steel sheet and the plating layer. In order to secure such effects in the present invention, it is preferable to add Si by 0.5 wt% or more. On the other hand, if it exceeds 3% by weight, the effect becomes saturated. Therefore, the content of Si is preferably 0.5 to 3% by weight, more preferably 1.4 to 1.8% by weight.
잔부 알루미늄(Al) 및 불가피한 불순물을 포함한다. 상기 조성 이외에 유효한 성분의 첨가가 배제되는 것은 아니다.
The remainder aluminum (Al) and unavoidable impurities. Addition of an effective component other than the above-mentioned composition is not excluded.
이하, 본 발명의 일 측면인 표면외관 및 도장성이 우수한 용융 Al-Zn계 도금강판의 제조방법에 대하여 상세히 설명한다.
Hereinafter, a method of manufacturing a molten Al-Zn based coated steel sheet having excellent surface appearance and paintability, which is one aspect of the present invention, will be described in detail.
먼저, 상술한 조성을 갖는 Al-Zn계 도금욕을 준비한 후, 상기 Al-Zn계 도금욕에 소지강판을 침지하고, 도금을 행하여 용융 Al-Zn계 도금강판을 제조한다.
First, an Al-Zn-based plating bath having the above composition is prepared, a base steel sheet is immersed in the Al-Zn-based plating bath and plated to produce a molten Al-Zn-based plated steel sheet.
본 발명의 일 구현예에 따르면, 상기 용융 Al-Zn계 도금욕의 욕온도는 595~605℃일 수 있다. 상기 욕온도가 595℃ 미만인 경우에는 도금욕 용융물 응고로 인해 생성된 드로스(Dross) 화합물이 강판 표면에 푸착되어 표면 결함을 유발할 우려가 있으며, 반면, 605℃를 초과하는 경우에는 도금욕 내 흄(Fume) 발생량 증가로 인하여 애쉬(Ash) 부착과 같은 표면 결함이 발생할 우려가 있으며, 도금욕 전력 사용량 관리에 불리한 단점이 있다.
According to an embodiment of the present invention, the bath temperature of the molten Al-Zn-based plating bath may be 595 to 605 ° C. When the bath temperature is lower than 595 DEG C, the dross compound generated due to the solidification of the plating bath melt may fuse to the surface of the steel sheet to cause surface defects. On the other hand, when the bath temperature exceeds 605 DEG C, There is a fear that a surface defect such as an ash adhesion may occur due to an increase in the amount of generated fume, which is disadvantageous to the management of the power consumption of the plating bath.
이후, 상기 용융 Al-Zn계 도금강판을 냉각한다. 이때, 용융 Al-Zn계 도금강판의 냉각속도는 특별히 한정하지 않으나, 바람직하게는 15~30℃/sec일 수 있다.
Thereafter, the molten Al-Zn-based plated steel sheet is cooled. At this time, the cooling rate of the molten Al-Zn-based coated steel sheet is not particularly limited, but may be preferably 15 to 30 ° C / sec.
만약, 상기 냉각속도가 15℃/sec 미만인 경우에는 불충분한 냉각으로 인하여 미응고된 도금층이 용융도금설비 중 터치롤(Touch roll), 탑 롤(Top roll) 등에 전사되어 최종 제품의 표면 결함을 유발할 우려가 있으며, 반면, 30℃/sec를 초과하는 경우에는 급냉 및 과냉으로 인하여 스팽글(Spangle) 미세화 효과를 충분히 얻을 수 없으며, 팬(Fan), 블로워(Blower) 등에 의한 노즐 마크(Nozzle mark)가 도금층에 전사되는 등 표면 불량이 발생할 우려가 있다.
If the cooling rate is less than 15 ° C / sec, the non-solidified coating layer is transferred to a touch roll, a top roll or the like among the hot-dip coating facilities due to insufficient cooling to cause surface defects of the final product If the temperature is more than 30 ° C / sec, the effect of miniaturization of the spangle can not be sufficiently obtained due to quenching and supercooling, and a nozzle mark produced by a fan, a blower, There is a possibility that the surface defect such as transferred to the plating layer may occur.
상기 냉각시, 냉각방법으로는 도금층을 냉각시킬 수 있는 통상의 냉각방법을 이용할 수 있으며, 예컨대 Air jet cooler를 이용하거나 N2 와이핑 또는 water fog 등을 분무함으로써 냉각을 수행할 수 있다.
As the cooling method, a cooling method that can cool the plating layer can be used. For example, cooling can be performed by using an air jet cooler, spraying N 2 wiping, water fog, or the like.
상기 냉각시, 상기 용융 Al-Zn계 도금강판의 표면에 알루미늄 분말을 분사한다. 이와 같이 강판의 표면에 분사된 알루미늄 분말은 도금층의 응고시 결정 생성의 시발점인 핵의 역할을 하게 된다. 이렇게 생성된 핵들은 응고시의 불균일 핵생성(Heterogeneous Nucleation) 원리에 의해 상호간 핵성장을 일으키고, 도금층 응고조직의 계면(Grain Boundary) 미세화를 일으켜, 결과적으로 도금층 표면의 스팽글(Spangle)을 1mm 미만으로 미세화하게 된다.
At the time of cooling, aluminum powder is sprayed onto the surface of the molten Al-Zn-based plated steel sheet. The aluminum powder sprayed on the surface of the steel sheet functions as a nucleus which is a starting point of crystal formation during solidification of the plating layer. The nuclei thus formed cause mutual nucleation by the principle of heterogeneous nucleation at the time of solidification and cause fine grain boundary of the solidification structure of the plating layer and consequently cause the spangle of the surface of the plating layer to be less than 1 mm It becomes finer.
본 발명에서 이러한 효과를 얻기 위해서는 알루미늄 분말의 입자 크기는 18~32㎛인 것이 바람직하고, 분사 속도는 40~80g/m2/min인 것이 바람직하다. 이때, 알루미늄 분말의 입자 크기란, 평균 입자 크기가 아닌, 99중량% 이상의 분말의 실제 입자 크기를 의미한다.
In order to obtain such effects in the present invention, the particle size of the aluminum powder is preferably 18 to 32 mu m, and the spraying speed is preferably 40 to 80 g / m < 2 > / min. Here, the particle size of the aluminum powder means the actual particle size of not less than 99% by weight of the powder, not the average particle size.
상기 입자 크기가 18㎛ 미만인 경우에는 도금층의 응고시 결정 생성의 시발점인 핵을 충분히 형성시킬 수 없으며, 이에 따라 상호간 핵성장을 일으키기 위한 추진력(Driving Force)이 부족하여 스팽글 미세화 효과를 충분히 얻을 수 없는 문제가 있다. 반면, 32㎛를 초과하는 경우에는 알루미늄 분말간 뭉침 현상이 발생하여 도금층 표면 외관 불량을 야기하며, 제조 원가가 상승하는 문제가 있다.
When the particle size is less than 18 탆, it is impossible to sufficiently form a nucleus, which is a starting point of crystal formation upon solidification of the plating layer. As a result, a driving force for causing mutual nucleation is insufficient, there is a problem. On the other hand, when it is more than 32 탆, aggregation between aluminum powders occurs, resulting in poor appearance of the surface of the plating layer, resulting in an increase in manufacturing cost.
또한, 상기 분사 속도가 40g/m2/min 미만인 경우에는 알루미늄 분말이 도금층 내 충분히 파고 들지 못해 스팽글 미세화 효과를 충분히 얻을 수 없는 문제가 있으며, 반면, 80g/m2/min을 초과하는 경우에는 알루미늄 분말의 과다 사용으로 인한 제조원가의 상승 및 알루미늄 분진의 과다 발생으로 인한 환경 오염 등의 문제가 있다.
Further, the aluminum case of the injection rate when 40g / m 2 / min is less than the aluminum powder coating layer and the inside can not lift enough to digging problem can not sufficiently obtain the spangle refinement effect, on the other hand, exceeding 80g / m 2 / min There is a problem such as an increase in manufacturing cost due to excessive use of the powder and environmental pollution due to excessive generation of aluminum dust.
한편, 본 발명의 일 구현예에 따르면, 상기 냉각시 알루미늄 분말의 분사는, 용융 Al-Zn계 도금강판의 표면온도가 250~350℃인 때에 이루어질 수 있으며, 보다 바람직하게는, 280~320℃인 때에 이루어질 수 있다.
According to an embodiment of the present invention, the spraying of the aluminum powder during the cooling may be performed when the surface temperature of the molten Al-Zn-based coated steel sheet is 250 to 350 ° C, more preferably 280 to 320 ° C . ≪ / RTI >
상기 알루미늄 분말의 분사시 용융 Al-Zn계 도금강판의 표면온도가 250℃ 미만인 경우에는 이미 도금층의 응고가 대부분 이루어져 알루미늄 분말의 분사에 따른 스팽글(Spangle) 미세화 효과를 충분히 얻지 못할 우려가 있으며, 반면, 350℃를 초과하는 경우에는 분사된 알루미늄 분말이 결정 생성의 시발점인 핵의 역할을 충분히 수행하지 못해 스팽글(Spangle) 미세화 효과를 충분히 얻지 못할 우려가 있다.
If the surface temperature of the molten Al-Zn-based coated steel sheet during spraying of the aluminum powder is less than 250 ° C, most of the solidification of the plating layer has already occurred, and there is a possibility that the effect of sputtering due to the spraying of aluminum powder may not be sufficiently obtained If the temperature is higher than 350 ° C, the sprayed aluminum powder does not sufficiently function as a nucleus which is a starting point of crystal formation, and thus there is a fear that the effect of sputtering can not be sufficiently obtained.
본 발명의 일 구현예에 따르면, 상기 도금강판을 제조한 후, 이를 냉각하기 전, 상기 용융 Al-Zn계 도금강판을 가스 와이핑하여 도금 부착량을 조절할 수 있다.
According to an embodiment of the present invention, after the coated steel sheet is manufactured, the coated amount of plating may be adjusted by gas wiping the molten Al-Zn-based coated steel sheet before cooling the coated steel sheet.
또한, 본 발명의 일 구현예에 따르면, 상기 가스 와이핑시 공기 또는 질소를 이용할 수 있으며, 이 중 질소를 이용함이 보다 바람직하다. 이는, 공기를 사용할 경우 후물재 도금시 알루미늄 산화물에 의한 표면결함이 발생하는 문제가 있기 때문이다.
Further, according to an embodiment of the present invention, air or nitrogen may be used for the gas wiping, and nitrogen is more preferably used. This is because, when air is used, there is a problem that surface defects due to aluminum oxide occur in the post material plating.
본 발명에 따라 제조된 용융 Al-Zn계 도금강판은 도금층 표면의 스팽글의 평균 입경이 1.0mm 미만으로 미려한 표면 외관을 가질 뿐만 아니라, 도장성이 매우 우수한 장점이 있다.
The fused Al-Zn based coated steel sheet produced according to the present invention has an advantage that the average particle diameter of the sequin on the surface of the plating layer is not more than 1.0 mm and the surface appearance is excellent and the paintability is excellent.
이하, 실시예를 통하여 본 발명을 보다 구체적으로 설명하고자 한다. 다만, 하기의 실시예는 본 발명을 예시하여 보다 상세하게 설명하기 위한 것일 뿐, 본 발명의 권리범위를 한정하기 위한 것이 아니라는 점에 유의할 필요가 있다. 본 발명의 권리범위는 특허청구범위에 기재된 사항과 이로부터 합리적으로 유추되는 사항에 의해 결정되는 것이기 때문이다.
Hereinafter, the present invention will be described more specifically by way of examples. It should be noted, however, that the following examples are intended to illustrate the invention in more detail and not to limit the scope of the invention. The scope of the present invention is determined by the matters set forth in the claims and the matters reasonably inferred from them.
(( 실시예Example ))
중량%로, 아연(Zn): 43.4%, 실리콘(Si): 1.6%, 잔부 알루미늄(Al) 및 불가피한 불순물을 포함하는 Al-Zn계 도금욕을 준비하고, 도금용 시편으로 두께 1.2mm, 폭 100mm 및 높이 200mm인 저탄소(0.04wt% C) 냉연강판을 소지강판으로 준비한 후, 상기 소지강판을 아세톤에 침지하고 초음파 세척하여 표면에 존재하는 압연유 등의 이물질을 제거하였다.Zn-based plating bath containing 43.4% of zinc (Zn), 1.6% of silicon (Si), and the balance aluminum (Al) and unavoidable impurities was prepared as a plating solution by weight, (0.04 wt% C) cold rolled steel sheet having a thickness of 100 mm and a height of 200 mm was prepared as a base steel sheet, the base steel sheet was immersed in acetone and ultrasonically cleaned to remove foreign substances such as rolling oil present on the surface.
도금을 수행하기 전 모든 시편은 일반 용융도금 현장에서 강판의 기계적 특성 확보를 위하여 실행하는 800℃에서 환원 분위기 열처리 과정을 거쳤다.Before plating, all specimens were subjected to a reducing atmosphere heat treatment at 800 ° C in order to secure the mechanical properties of the steel sheet at the general hot dip galvanizing site.
열처리 이후에 행해지는 도금 조건은 모두 동일하게 처리하였으며, 상기 도금욕 온도는 600℃로 일정하게 하였다.The plating conditions after the heat treatment were all treated in the same manner, and the plating bath temperature was kept constant at 600 ° C.
이후, 각 시편을 N2 가스와이핑을 이용하여 편면 도금 부착량이 60g/m2이 되도록 조절하고, 250℃의 온도까지 17.5℃/sec의 속도로 냉각하였으며, 각 시편의 표면 온도가 300℃가 되었을 때부터 냉각 종료시까지 입자 크기가 18~32㎛인 알루미늄 분말을 하기 표 1의 속도로 분사하였다.
Then, each specimen was adjusted to have a coating amount of one side plating of 60 g / m 2 using N 2 gas wiping and cooled to a temperature of 250 ° C. at a rate of 17.5 ° C./sec. The surface temperature of each specimen was 300 ° C. The aluminum powder having a particle size of 18 to 32 탆 was sprayed at the rate shown in Table 1 below.
이후, 제조된 각각의 시편 표면의 스팽글 평균입경을 측정하여, 그 결과를 하기 표 1에 함께 나타내었다. 상기 스팽글 평균입경은 광학현미경을 이용하여 소재의 결정입도 시험법(KS-D-0205)을 모사하여 측정하였다.
Thereafter, the average particle size of each of the prepared specimens was measured, and the results are shown in Table 1 below. The average particle size of the sequins was measured by using an optical microscope to simulate the crystal grain size of the material (KS-D-0205).
이후, 제조된 각각의 시편을 대상으로 그 표면에 컬러 도장을 실시한 후, 도장성을 평가하여, 그 결과를 하기 표 1에 함께 나타내었다. 평가는 육안에 의해 이뤄졌으며, 도장 후 시편의 표면에서 스팽글 무늬가 육안으로 관찰되는 경우 "NG", 관찰되지 않는 경우 "GO"로 나타내었다.
Then, each of the prepared specimens was subjected to color coating on its surface, and paintability was evaluated. The results are also shown in Table 1 below. The evaluation was made by naked eye, and when the sequin pattern was observed on the surface of the specimen after painting, it was indicated as "NG" when it was visually observed and "GO" when it was not observed.
(g/m2/min)Aluminum powder injection speed
(g / m 2 / min)
(mm)Average particle size of sequins
(mm)
표 1에 나타난 바와 같이, 알루미늄 분말의 분사속도가 본 발명의 범위를 만족하는 발명예 1 내지 4는 모두 도금층 표면에서 관찰되는 스팽글의 평균입경이 1.0mm 미만으로, 표면외관이 매우 우수하게 나타났으며, 도장성 역시 우수하게 나타남을 알 수 있다.As shown in Table 1, in Examples 1 to 4 in which the spraying speed of the aluminum powder satisfied the range of the present invention, the average particle size of the sequins observed on the surface of the plating layer was less than 1.0 mm and the surface appearance was excellent And the paintability is also excellent.
반면, 비교예 1 내지 5 알루미늄 분말의 분사속도가 본 발명이 제어하는 범위를 벗어나 표면외관이 열위하게 나타났으며, 도장성 역시 열위하게 나타남을 알 수 있다.
On the other hand, Comparative Examples 1 to 5 It can be seen that the spraying speed of the aluminum powder is out of the range controlled by the present invention, and the surface appearance is dull and the paintability is also poor.
한편, 도 1의 (a)는 발명예 1에 따른 발명예 1에 따른 용융 Al-Zn계 도금강판의 표면을 관찰하여 나타낸 것이고, 도 1의 (b)는 발명예 1에 따른 용융 Al-Zn계 도금강판을 컬러 도장한 후, 그 표면을 관찰하여 나타낸 것이며, 도 2의 (a)는 비교예 1에 따른 용융 Al-Zn계 도금강판의 표면을 관찰하여 나타낸 것이고, 도 2의 (b)는 비교예 1에 따른 용융 Al-Zn계 도금강판을 컬러 도장한 후, 그 표면을 관찰하여 나타낸 것이다.
1 (a) shows the surface of a molten Al-Zn-based plated steel sheet according to Inventive Example 1 according to Inventive Example 1, and FIG. 1 (b) 2 (a) is a graph showing the surface of a molten Al-Zn-based plated steel sheet according to Comparative Example 1, and FIG. 2 (b) Shows the surface of the molten Al-Zn-based plated steel sheet according to Comparative Example 1 after color coating.
도 1 및 2를 참조하여 볼 때, 본 발명이 제어하는 범위를 만족할 경우, 용융 Al-Zn계 도금강판의 표면 외관 및 도장성이 매우 우수함을 보다 명확히 알 수 있다.Referring to FIGS. 1 and 2, it can be clearly seen that the surface appearance and paintability of the molten Al-Zn-based plated steel sheet are excellent when the range to be controlled by the present invention is satisfied.
Claims (7)
상기 Al-Zn계 도금욕에 소지강판을 침지하고, 도금을 행하여 용융 Al-Zn계 도금강판을 제조하는 단계; 및
상기 용융 Al-Zn계 도금강판을 냉각하는 단계를 포함하며,
상기 냉각시, 용융 Al-Zn계 도금강판의 표면에 입자 크기가 18~32㎛인 알루미늄 분말을 40~80g/m2/min의 속도로 분사하는 것을 특징으로 하는 표면외관 및 도장성이 우수한 용융 Al-Zn계 도금강판의 제조방법.
Preparing an Al-Zn based plating bath containing 35 to 55% of zinc (Zn), 0.5 to 3.0% of silicon (Si), aluminum (Al) and unavoidable impurities in terms of% by weight;
Immersing a base steel sheet in the Al-Zn base plating bath and performing plating to produce a molten Al-Zn base plated steel sheet; And
And cooling the molten Al-Zn-based plated steel sheet,
Characterized in that aluminum powder having a particle size of 18 to 32 탆 is sprayed onto the surface of the molten Al-Zn-based plated steel sheet at a rate of 40 to 80 g / m 2 / min during the cooling. A method for producing an Al-Zn-based coated steel sheet.
상기 Al-Zn계 도금욕은 중량%로, 아연(Zn): 41.4~45.4%, 실리콘(Si): 1.4~1.8%, 잔부 알루미늄(Al) 및 불가피한 불순물을 포함하는 표면외관 및 도장성이 우수한 용융 Al-Zn계 도금강판의 제조방법.
The method according to claim 1,
The Al-Zn-based plating bath preferably has a surface appearance and coating property including zinc (Zn): 41.4 to 45.4%, silicon (Si): 1.4 to 1.8%, aluminum (Al) A method for manufacturing a molten Al-Zn-based plated steel sheet.
상기 용융 Al-Zn계 도금욕의 욕온도는 595~605℃인 표면외관 및 도장성이 우수한 용융 Al-Zn계 도금강판의 제조방법.
The method according to claim 1,
Wherein the bath temperature of the molten Al-Zn-based plating bath is in the range of 595 to 605 DEG C and is excellent in surface appearance and paintability.
상기 용융 Al-Zn계 도금강판 제조 후 냉각 전,
상기 용융 Al-Zn계 도금강판을 가스 와이핑하여 도금 부착량을 조절하는 단계를 더 포함하는 표면외관 및 도장성이 우수한 용융 Al-Zn계 도금강판의 제조방법.
The method according to claim 1,
After the production of the molten Al-Zn-based plated steel sheet and before cooling,
Further comprising the step of regulating the deposition amount of the plated steel sheet by gas wiping the molten Al-Zn-based plated steel sheet.
상기 가스 와이핑시 사용하는 가스는 질소(N2)인 표면외관 및 도장성이 우수한 용융 Al-Zn계 도금강판의 제조방법.
5. The method of claim 4,
Wherein the gas used for the gas wiping is nitrogen (N 2 ), and the surface appearance and paintability are excellent.
상기 용융 Al-Zn계 도금강판의 냉각시, 냉각속도는 15~30℃/sec인 표면외관 및 도장성이 우수한 용융 Al-Zn계 도금강판의 제조방법.
The method according to claim 1,
A method for producing a molten Al-Zn based plated steel sheet excellent in surface appearance and paintability at a cooling rate of 15 to 30 DEG C / sec during cooling of the molten Al-Zn based plated steel sheet.
상기 냉각시 알루미늄 분말의 분사는, 용융 Al-Zn계 도금강판의 표면온도가 250~350℃인 때에 이루어지는 표면외관 및 도장성이 우수한 용융 Al-Zn계 도금강판의 제조방법.The method according to claim 1,
The method of producing a molten Al-Zn-based plated steel sheet excellent in surface appearance and paintability when the surface temperature of the molten Al-Zn-based plated steel sheet is 250 to 350 占 폚.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190076754A (en) * | 2017-12-22 | 2019-07-02 | 포스코강판 주식회사 | Method for manufacturing hot dip aluminum plated steel sheet |
| WO2020111881A1 (en) * | 2018-11-30 | 2020-06-04 | 주식회사 포스코 | Steel sheet plated with al-fe for hot press forming having excellent corrosion resistance and spot weldability, and manufacturing method thereof |
| KR20200066239A (en) * | 2018-11-30 | 2020-06-09 | 주식회사 포스코 | STEEL SHEET PLATED WITH Al-Fe FOR HOT PRESS FORMING HAVING EXCELLENT CORROSION RESISTANCE AND SPOT WELDABILITY, AND MANUFACTURING METHOD THEREOF |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20190076754A (en) * | 2017-12-22 | 2019-07-02 | 포스코강판 주식회사 | Method for manufacturing hot dip aluminum plated steel sheet |
| KR102025710B1 (en) * | 2017-12-22 | 2019-09-26 | 포스코강판 주식회사 | Method for manufacturing hot dip aluminum plated steel sheet |
| WO2020111881A1 (en) * | 2018-11-30 | 2020-06-04 | 주식회사 포스코 | Steel sheet plated with al-fe for hot press forming having excellent corrosion resistance and spot weldability, and manufacturing method thereof |
| KR20200066239A (en) * | 2018-11-30 | 2020-06-09 | 주식회사 포스코 | STEEL SHEET PLATED WITH Al-Fe FOR HOT PRESS FORMING HAVING EXCELLENT CORROSION RESISTANCE AND SPOT WELDABILITY, AND MANUFACTURING METHOD THEREOF |
| KR102280093B1 (en) * | 2018-11-30 | 2021-07-22 | 주식회사 포스코 | STEEL SHEET PLATED WITH Al-Fe FOR HOT PRESS FORMING HAVING EXCELLENT CORROSION RESISTANCE AND SPOT WELDABILITY, AND MANUFACTURING METHOD THEREOF |
| EP3889312A4 (en) * | 2018-11-30 | 2021-10-27 | Posco | Steel sheet plated with al-fe for hot press forming having excellent corrosion resistance and spot weldability, and manufacturing method thereof |
| US11529795B2 (en) | 2018-11-30 | 2022-12-20 | Posco Holdings Inc. | Steel sheet plated with Al—Fe for hot press forming having excellent corrosion resistance and spot weldability, and manufacturing method thereof |
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