KR20030027288A - A spray coating method for hearth roll - Google Patents

A spray coating method for hearth roll Download PDF

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Publication number
KR20030027288A
KR20030027288A KR1020010060414A KR20010060414A KR20030027288A KR 20030027288 A KR20030027288 A KR 20030027288A KR 1020010060414 A KR1020010060414 A KR 1020010060414A KR 20010060414 A KR20010060414 A KR 20010060414A KR 20030027288 A KR20030027288 A KR 20030027288A
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South Korea
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hearth roll
spray coating
coating layer
coating method
thermal spray
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KR1020010060414A
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Korean (ko)
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KR100439411B1 (en
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박영서
김신태
이운동
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제일 엠.피.티 주식회사
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Priority to KR10-2001-0060414A priority Critical patent/KR100439411B1/en
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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
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C23C4/073—Metallic material containing MCrAl or MCrAlY alloys, where M is nickel, cobalt or iron, with or without non-metal elements
    • 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
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/18—After-treatment

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating By Spraying Or Casting (AREA)

Abstract

PURPOSE: A plasma spray coating method of hearth roll is provided to give superior thermal shock resistance to the hearth roll by forming a bond coat on the surface of the hearth roll and forming a top coat on the bond coat using plasma spray coating method, thereby increasing deposition efficiency and minimizing internal stress. CONSTITUTION: The plasma spray coating method of hearth roll is characterized in that a bond coat (12) is formed on the hearth roll (11) by spray-coating spraying powder having constituents of CoNiCrAlY on the surface of the hearth roll, and a top coat (13) is formed on the bond coat by spray-coating spraying powder in which Cr3C2-NiCr is mixed with CoNiCrAlY on the bond coat, wherein the bond coat is formed of a spraying material comprising 30 to 35 wt.% of Ni, 20 to 25 wt.% of Cr, 10 to 6 wt.% of Al, 1 to 0.1 wt.% of Y and a balance of Co, and wherein the top coat is formed of a spraying material in which a spraying material comprising 24.0 to 25.5 wt.% of Ni, 8.0 to 9.5 wt.% of C and a balance of Cr is mixed with a spraying material comprising 30 to 35 wt.% of Ni, 20 to 25 wt.% of Cr, 10 to 6 wt.% of Al, 1 to 0.1 wt.% of Y and a balance of Co. The plasma spray coating method of hearth roll comprises the processes of forming a bond coat (12) by spray-coating spraying powder of CoAl-Cr3C2 constituents on the surface of the hearth roll (11); forming a top coat (13) on the bond coat by spray-coating spraying powder of CoAl-Cr3C2Al2O3 constituents on the bond coat; and heating to fire the coated hearth roll at a temperature of 650±10 deg.C for 110 to 130 minutes.

Description

허스롤의 용사코팅방법{A spray coating method for hearth roll}A spray coating method for hearth roll}

본 발명은 냉연강판의 연속 소둔이나 도금공정 등에서 강판 이송수단으로 사용되는 허스롤의 용사코팅방법에 관한 것으로서, 보다 상세하게는 플라즈마용사법을 이용한 허스롤의 용사코팅방법에 관한 것이다.The present invention relates to a spray coating method of a hearth roll used as a steel sheet conveying means in the continuous annealing or plating process of a cold rolled steel sheet, and more particularly, to a spray coating method of a hearth roll using a plasma spray method.

일반적으로, 제철소의 냉간압연공정 등에서는 박판의 강판 이송을 위하여 소위, 프로세스롤이라고 불리우는 다수의 롤을 이용한다. 이와 같은 허스롤은 예컨대, 연속소둔공정의 소둔로 내부의 예열대와 가열대 및 냉각대에 설치되는 허스롤(hearth roll)과, 연속도금공정의 용융도금욕 내부에 설치되는 싱크롤(sink roll) 및 상온에서 이용되는 메저링롤(measuring roll) 등이 있다.Generally, in the cold rolling process of steel mills, many rolls, called process rolls, are used for conveying sheet steel. Such a hearth roll is, for example, a hearth roll installed in a preheating zone, a heating zone, and a cooling zone in an annealing furnace of a continuous annealing process, and a sink roll installed in a molten plating bath of a continuous plating process. And a mesuring roll used at room temperature.

상기 허스롤은 로내의 철분과 철산화물이 표면에 부착되어 수소가스 환원 분위기에 의해 활성화됨에 따라 응고 퇴적하여 괴상화되는 소위, 빌트업(built-up; 게재물층)을 형성하게 된다. 이와 같이 빌트업에 의해 고착된 퇴적물은 강판의 표면을 손상시키는 요인으로 작용하게 되는데, 특히 허스롤의 표면경도가 작은 경우 이송 강판이나 불순물에 의해 표면에 스크레치 등의 자국이 발생하여 강판의 표면에 전사됨으로써 결함을 유발시키게 된다.The hearth roll forms a so-called built-up (item layer) in which the iron and iron oxide in the furnace are attached to the surface and activated by a hydrogen gas reducing atmosphere to coagulate and massify. The sediment fixed by the built-up acts as a factor of damaging the surface of the steel sheet. In particular, when the surface hardness of the hearth roll is small, scratches, such as scratches, are generated on the surface of the steel sheet by the transfer steel sheet or impurities. The transfer causes a defect.

따라서, 상기한 바와 같은 허스롤은 그 용도나 기능 및 이송 강판의 종류 등에 따라 우수한 내마모성과 내이물질 부착성 및 내열충격성 등과 같은 표면 특성이 요구되는데, 예를 들면 통상 400 내지 1050℃ 온도 범위에서 예열대와 가열대 및 냉각대로 구분되는 온도 영역에 따라 서로 다른 특성이 요구되기도 한다. 즉, 예열대 허스롤은 강판을 상온에서 고온으로 고속 이송하게 되므로 우수한 내마모성이 요구된다. 그리고, 가열대 허스롤은 로내의 온도와 강판의 온도 차이에 따른 내열충격성이 요구되며, 냉각대 허스롤은 강판의 균일한 서냉과 급냉을 위해 냉각성과 내마모성이 요구된다.Therefore, the above-described hearth rolls require surface characteristics such as excellent wear resistance, foreign matter adhesion, thermal shock resistance, etc., depending on the use, function, and type of conveyed steel sheet, for example, in the temperature range of 400 to 1050 ° C. Different properties may be required depending on the temperature zone, which is divided into the tropics and the heating and cooling zones. That is, the preheating hearth roll is required to have excellent wear resistance since the steel sheet is rapidly transported from room temperature to high temperature. In addition, the heat sink hearth roll is required for the thermal shock resistance according to the temperature difference between the temperature in the furnace and the steel sheet, the cooling hearth roll is required for cooling and wear resistance for uniform slow cooling and rapid cooling of the steel sheet.

한편, 상기한 바와 같은 허스롤의 표면 특성을 얻기 위하여 종래에는 용사코팅법에 의해 내열금속 등을 이용한 산화물 코팅층을 형성하여 사용하는 경우가 일반적이었다.On the other hand, in order to obtain the surface properties of the hearth roll as described above, it was common to form and use an oxide coating layer using a heat-resistant metal or the like by the thermal spray coating method.

그러나, 상기한 내열금속의 산화물 코팅층은 강판의 조성성분과 반응하여 제3의 반응생성물을 생성하게 되므로, 산화물 코팅층의 크랙(crack)과 박리현상 등을 유발시켜 허스롤의 수명 단축뿐만 아니라 강판의 품질 저하를 유발시키는 문제점을 가지고 있다.However, since the oxide coating layer of the heat-resistant metal reacts with the composition of the steel sheet to generate a third reaction product, cracking and peeling of the oxide coating layer may be caused to shorten the life of the hearth roll as well as the steel sheet. There is a problem that causes quality deterioration.

따라서, 본 발명은 상기한 바와 같은 종래 허스롤이 가지는 문제점을 감안하여 이를 개선하기 위해 창출된 것으로서, 본 발명의 목적은 플라즈마 용사코팅 프로세스를 이용하여 내마모성과 내이물질 부착성 특히 내열충격성이 보다 향상된 허스롤 및 그 허스롤의 용사코팅방법을 제공하기 위한 것이다.Therefore, the present invention was created in order to improve the problem in view of the problems with the conventional hearth roll as described above, and an object of the present invention is to improve wear resistance and foreign matter adhesion, in particular, thermal shock resistance, by using a plasma spray coating process. It is to provide a hearth roll and a spray coating method of the hearth roll.

도 1은 본 발명의 일실시예에 의한 용사코팅방법에 따라 얻어진 허스롤의 용사코팅층을 개략적으로 나타내 보인 단면 구성도,1 is a cross-sectional configuration diagram schematically showing the spray coating layer of the hearth roll obtained by the spray coating method according to an embodiment of the present invention,

도 2는 본 발명의 다른 실시예에 의한 용사코팅방법에 따라 얻어진 허스롤의 용사코팅층을 개략적으로 나타내 보인 단면 구성도.Figure 2 is a schematic cross-sectional view showing a spray coating layer of the hearth roll obtained by the spray coating method according to another embodiment of the present invention.

도 3은 본 발명에 의한 용사코팅방법을 적용하기 위한 프로세스를 개략적으로 나타내 보인 공정도.Figure 3 is a process diagram schematically showing a process for applying the spray coating method according to the present invention.

* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

11...허스롤11 Hearth Roll

12, 22...본드코팅층12, 22 ... bond coating layer

13, 23...톱코팅층13, 23 ... Top coating layer

상기한 바와 같은 목적을 달성하기 위하여 본 발명에 의한 허스롤의 용사코팅방법은, 플라즈마 용사코팅방법에 의해 허스롤의 표면에 CoNiCrAlY 성분의 용사 분말을 용사 코팅하여 본드코팅층을 형성하고, 상기 본드코팅층 위에 Cr3C2-NiCr과 CoNiCrAlY가 혼합된 용사분말을 용사 코팅하여 톱코팅층을 형성하는 것을 특징으로 한다.In order to achieve the object as described above, the thermal spray coating method of the hearth roll according to the present invention is a thermal spray coating method to form a bond coating layer by thermally coating a spray powder of CoNiCrAlY component on the surface of the hearth roll by the plasma spray coating method, and forming the bond coating layer. The spray coating of the sprayed powder Cr 3 C 2 -NiCr and CoNiCrAlY is characterized in that to form a top coating layer.

본 발명에 따르면, 상기 본드코팅층은 Ni; 30 ~ 35wt%, Cr; 20 ~ 25wt%, Al; 10 ~ 6wt%, Y; 1 ~ 0.1wt% 및 나머지가 Co로 이루어진 조성범위의 용사재로 형성하는 것이 바람직하다.According to the present invention, the bond coating layer is Ni; 30-35 wt%, Cr; 20-25 wt%, Al; 10-6 wt%, Y; 1 to 0.1wt% and the remainder is preferably formed of the thermal spraying material of the composition range consisting of Co.

그리고, 상기 톱코팅층은 Cr3C2-NiCr써어맷과 CoNiCrAlY를 각각 70 ~ 80wt%와 20 ~ 30wt% 로 혼합한 용사분말을 용사 코팅하여 형성하는 것이 바람직하며, 상기 Cr3C2-NiCr써어맷은 Ni; 24.0 ~ 25.5wt%, C; 8.0 ~ 9.5wt%, 나머지가 Cr로 이루어지고, 상기 CoNiCrAlY는 Ni; 30 ~ 35wt%, Cr; 20 ~ 25wt%, Al; 10 ~ 6wt%, Y; 1 ~ 0.1wt% 및 나머지가 Co로 이루어진 것이 바람직하다.The top coating layer is preferably formed by spray coating a spray powder containing Cr 3 C 2 -NiCr thermet and CoNiCrAlY at 70 to 80 wt% and 20 to 30 wt%, respectively, and the Cr 3 C 2 -NiCr The format is Ni; 24.0 to 25.5 wt%, C; 8.0-9.5 wt%, the remainder is made of Cr, and the CoNiCrAlY is Ni; 30-35 wt%, Cr; 20-25 wt%, Al; 10-6 wt%, Y; It is preferable that 1 to 0.1 wt% and the rest are made of Co.

또한, 상기한 바와 같은 목적을 달성하기 위하여 본 발명에 의한 다른 허스롤의 용사코팅방법은, 플라즈마 용사코팅방법에 의해 허스롤의 표면에 CoAl-Cr3C2성분의 용사분말을 용사코팅하여 본드코팅층을 형성하고, 그 본드코팅층 위에 CoAl-Cr3C2Al2O3성분의 용사분말을 용사코팅하여 톱코팅층을 형성한 다음, 650 ±10℃에서 110 내지 130분간 가열 소성하는 것을 특징으로 한다.In addition, in order to achieve the above object, another method of spray coating of the hearth roll according to the present invention is to bond by spray coating a spray powder of CoAl-Cr 3 C 2 component on the surface of the hearth roll by a plasma spray coating method. A coating layer is formed, and a thermal spray coating of CoAl-Cr 3 C 2 Al 2 O 3 component is thermally coated on the bond coating layer to form a top coating layer, and then calcined at 110 to 130 minutes at 650 ± 10 ° C. .

본 발명의 다른 측면에 따르면, 상기 본드코팅층은 CoCrAl-Cr3C2계 써어맷, CoNiCrAlY, Cr3C2-NiCr, MCrAlY 중 적어도 하나 이상이 혼합된 성분의 용사재가 용사코팅되는 것이 바람직하며, 상기 톱코팅층은 CoCrAl-Al2O3-Cr3C2, Cr3C2-NiCr, MCrAlY중 적어도 하나 이상이 혼합된 성분의 용사재가 용사코팅되는 것이 바람직하다.According to another aspect of the present invention, the bond coating layer is preferably a thermal spray coating of the thermal spray material of a component in which at least one of CoCrAl-Cr 3 C 2 -based cermet, CoNiCrAlY, Cr 3 C 2 -NiCr, MCrAlY is mixed, The top coating layer is preferably a thermal spray coating of the thermal spraying material of at least one of CoCrAl-Al 2 O 3 -Cr 3 C 2 , Cr 3 C 2 -NiCr, MCrAlY mixed components.

본 발명에 따르면, 상기 톱코팅층은 70 ±30㎛ 범위의 두께로 형성되고, Ra 8 ±4㎛ 범위의 표면조도를 가지도록 형성되는 것이 바람직하다.According to the present invention, the top coating layer is preferably formed to have a thickness in the range of 70 ± 30㎛, and has a surface roughness in the range of Ra 8 ± 4㎛.

이하, 첨부된 도면을 참조하여 본 발명에 의한 허스롤의 용사코팅방법에 대하여 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail a spray coating method of the hearth roll according to the present invention.

본 발명에 의한 허스롤의 용사코팅방법은 통상적인 용사방법의 프로세스적용이 가능하지만, 특히 플라즈마 용사방법의 프로세스를 적용하는 것이 보다 바람직하다.The spray coating method of the hearth roll according to the present invention is possible to apply the process of the conventional spraying method, but it is more preferable to apply the process of the plasma spraying method.

본 발명의 일실시예에 의한 허스롤의 용사코팅방법에 따르면, 도 1에 도시된 바와 같이 플라즈마 용사방법에 의해 허스롤(11)의 표면에 CoNiCrAlY 성분의 용사분말을 용사 코팅하여 본드코팅층(12)을 형성하고, 그 본드코팅층(12) 위에 Cr3C2-NiCr 써어맷(cermet)과 CoNiCrAlY를 혼합한 복합분말을 용사 코팅하여 톱코팅층(13)을 형성한 점에 특징이 있다.According to the thermal spray coating method of the hearth roll according to an embodiment of the present invention, as shown in FIG. 1, a thermal spray coating of CoNiCrAlY component on the surface of the hearth roll 11 is spray-coated to form a bond coating layer 12. ), And the top coating layer 13 is formed by thermally coating a composite powder of Cr 3 C 2 -NiCr cermet and CoNiCrAlY on the bond coating layer 12.

본 발명의 일측면에 따르면, 상기 본드코팅층(12)을 형성하기 위한 용사재는 내열성이 우수한 코발트(Co)를 주성분으로 하는 CoNiCrAlY로 이루어지며, 그 조성 범위는 Ni; 30 ~ 35wt%, Cr; 20 ~ 25wt%, Al; 10 ~ 6wt%, Y; 1 ~ 0.1wt% 및 나머지가 Co로 이루어진 것이 바람직하다.According to one aspect of the present invention, the thermal spraying material for forming the bond coating layer 12 is made of CoNiCrAlY mainly composed of cobalt (Co) having excellent heat resistance, the composition range is Ni; 30-35 wt%, Cr; 20-25 wt%, Al; 10-6 wt%, Y; It is preferable that 1 to 0.1 wt% and the rest are made of Co.

그리고, 상기 톱코팅층(13)을 형성하기 위한 용사재는 Cr3C2-NiCr써어맷과 CoNiCrAlY를 혼합하여 이루어진 것으로서, 각각 70 ~ 80wt%와 20 ~ 30wt% 로 혼합하여 사용하는 것이 바람직하다.In addition, the thermal spraying material for forming the top coating layer 13 is made of a mixture of Cr 3 C 2 -NiCr thermite and CoNiCrAlY, it is preferable to use a mixture of 70 ~ 80wt% and 20 ~ 30wt%, respectively.

그리고, 상기 Cr3C2-NiCr 써어맷은 그 조성 범위가 Ni; 24.0 ~ 25.5wt%, C; 8.0 ~ 9.5wt%, 나머지가 Cr로 이루어지고, 상기 CoNiCrAlY은 그 조성 범위가 Ni;30 ~ 35wt%, Cr; 20 ~ 25wt%, Al; 10 ~ 6wt%, Y; 1 ~ 0.1wt% 및 나머지가 Co로 이루어진 것이 바람직하다.The Cr 3 C 2 -NiCr cermet has a composition range of Ni; 24.0 to 25.5 wt%, C; 8.0 ~ 9.5wt%, the remainder is made of Cr, the CoNiCrAlY composition range is Ni; 30 ~ 35wt%, Cr; 20-25 wt%, Al; 10-6 wt%, Y; It is preferable that 1 to 0.1 wt% and the rest are made of Co.

본 발명의 다른 실시예에 의한 허스롤의 용사코팅방법에 따르면, 도 2에 도시된 바와 같이 플라즈마 용사방법에 의해 허스롤(21)의 표면에 CoAl-Cr3C2성분의 용사분말을 용사 코팅하여 본드코팅층(22)을 형성하고, 그 본드코팅층(22) 위에 CoAl-Cr3C2Al2O3성분의 용사분말을 용사 코팅하여 톱코팅층(23)을 형성한 다음, 650 ±10℃에서 110 내지 130분간 가열 소성하는 점에 특징이 있다.According to the thermal spray coating method of the hearth roll according to another embodiment of the present invention, the thermal spray coating of CoAl-Cr 3 C 2 component on the surface of the hearth roll 21 by the thermal spraying method as shown in FIG. To form a bond coating layer 22, and spray-coated a powder of CoAl-Cr 3 C 2 Al 2 O 3 component on the bond coating layer 22 to form a top coating layer 23, and then at 650 ± 10 ℃ It is characterized by heat firing for 110 to 130 minutes.

본 발명의 다른 측면에 따르면, 상기 본드코팅층(12)(22)은 CoCrAl-Cr3C2계 써어맷, CoNiCrAlY, Cr3C2-NiCr, MCrAlY 중의 어느 하나 또는 둘 이상이 혼합된 성분의 용사재를 용사 코팅하여 형성할 수도 있다.According to another aspect of the present invention, the bond coating layer (12) (22) is a thermal spraying of any one or two or more of a mixture of CoCrAl-Cr 3 C 2 type cermet, CoNiCrAlY, Cr 3 C 2 -NiCr, MCrAlY The ash may be formed by spray coating.

그리고, 상기 톱코팅층(13)(23)은 CoCrAl-Al2O3-Cr3C2, Cr3C2-NiCr, MCrAlY중의 어느 하나 또는 둘 이상이 혼합된 성분의 용사재를 용사 코팅하여 형성할 수도 있다.In addition, the top coating layers 13 and 23 are formed by spray coating a spray material of any one or two or more of CoCrAl-Al 2 O 3 -Cr 3 C 2 , Cr 3 C 2 -NiCr, and MCrAlY. You may.

상기한 바와 같은 본 발명에 의한 용사코팅방법에 있어서, 상기 본드코팅층(12)(22)과 상기 톱코팅층(13)(23)은 그 용착율을 높이고, 내부 응력을 최소화할 수 있도록 각각 일정한 범위 이내의 두께를 가지도록 형성한다.In the thermal spray coating method according to the present invention as described above, the bond coating layer 12, 22 and the top coating layer 13, 23 are each a certain range to increase the deposition rate and minimize the internal stress It is formed to have a thickness within.

본 발명에 따르면, 상기 본드코팅층(12)은 15 ~ 20㎛ 범위의 두께로 형성하는 것이 바람직하며, 상기 톱코팅층은 70 ±30㎛ 범위의 두께로 형성하는 것이 바람직하다.According to the present invention, the bond coating layer 12 is preferably formed in a thickness of 15 ~ 20㎛ range, the top coating layer is preferably formed in a thickness of 70 ± 30㎛ range.

그리고, 상기 톱코팅층(13)은 강판 이송시 내슬립성(slip)을 높이기 위하여 Ra 8 ±4㎛ 범위의 표면조도를 가지도록 형성되는 것이 바람직하다.In addition, the top coating layer 13 is preferably formed to have a surface roughness in the Ra 8 ± 4㎛ range in order to increase the slip resistance (slip) during steel sheet transfer.

본 발명에 의한 허스롤의 용사코팅방법에 따르면, 상기 본드코팅층(12)과 톱코팅층(13)을 형성한 허스롤(11)은 특히, 냉연공장의 연속소둔라인이나 연속아연도금라인의 예열대 및 냉각대에 설치되는 허스롤로 이용하는 것이 유효하다.According to the thermal spray coating method of the hearth roll according to the present invention, the hearth roll 11 having the bond coating layer 12 and the top coating layer 13 is particularly preheated in a continuous annealing line or a continuous zinc plating line of a cold rolling mill. And it is effective to use it as a hearth roll provided in a cooling stand.

그리고, 상기 본드코팅층(22)과 톱코팅층(23)을 형성한 허스롤(21)은 특히, 냉연공장의 연속소둔라인이나 연속아연도금라인의 가열대에 설치되는 허스롤로 이용하는 것이 유효하다.In addition, the hearth roll 21 in which the bond coating layer 22 and the top coating layer 23 are formed may be particularly used as a hearth roll installed in a heating zone of a continuous annealing line or a continuous zinc plating line of a cold rolling mill.

도 3은 본 발명에 의한 허스롤의 용사코팅방법 적용시 전후처리를 포함한 공정도로서, 이를 참조하면 가공 완료된 허스롤을 탈지 세척한 후, 내열테이프와 마스킹 테이프를 이용하여 마스킹(Masking)을 하고, 블라스트(Blast) 가공을 한다.Figure 3 is a process chart including before and after treatment when applying the spray coating method of the hearth roll according to the present invention, after degreasing washing the finished hearth roll, masking using a heat-resistant tape and masking tape, Blast processing.

상기 블라스트 가공은 용사후 요구되는 표면조도에 따라 다양한 형태의 가공방법이 이용될 수 있으며 예컨대, 알루미나 그리트(WA#16 ~ WA#80)를 사용하여 직압식으로 할 수 있고, 블라스트 가공후 허스롤의 표면 청정도는 SIS Sa3이 되도록 하는 것이 바람직하다.The blasting process may be used in various forms depending on the surface roughness required after the spraying, for example, it can be made by direct pressure using alumina grit (WA # 16 ~ WA # 80), after the blast processing hearth roll The surface cleanliness of is preferably SIS Sa3.

다음으로, 플라즈마 용사 프로세스에 의해 본 발명의 용코팅사방법이 적용되는데, 이때 상술한 바와 같은 용사분말을 100℃에서 60분간 건조시킨 후 사용한다.Next, the spray coating method of the present invention is applied by a plasma spraying process, wherein the thermal spraying powder as described above is used after drying at 100 ° C. for 60 minutes.

그리고, 허스롤은 예열온도 40 ~ 100℃, 예열거리 100±25mm 조건으로 예열한 다음, 하기[표 1]과 용사조건으로 플라즈마 용사를 실시한다.Then, the hearth roll is preheated at a preheating temperature of 40 to 100 ° C. and a preheating distance of 100 ± 25 mm, and then plasma sprayed under the following [Table 1] and the spraying conditions.

구 분division 예 열 대Tropical 가 열 대Tropical 냉 각 대Cooling stand 본드코팅Bond coating ArAr 50 SLPM50 SLPM 55 SLPM55 SLPM 50 SLPM50 SLPM HeHe 85 SLPM85 SLPM -- 85 SLPM85 SLPM H2 H 2 -- 9 SLPM9 SLPM -- 용사거리Champion Range 100mm100 mm 125mm125 mm 100mm100 mm 톱코팅Top Coating ArAr 50 SLPM50 SLPM 55 SLPM55 SLPM 50 SLPM50 SLPM HeHe 85 SLPM85 SLPM -- 85 SLPM85 SLPM H2 H 2 -- 9 SLPM9 SLPM -- 용사거리Champion Range 100mm100 mm 125 mm125 mm 100mm100 mm

* SLPM(Standard Litres Per Minute)* Standard Litres Per Minute (SLPM)

상술한 바와 같은 조건으로 플라즈마 용사코팅이 완료되면, 소성처리를 거쳐 코팅층의 조도 형성을 위한 연삭가공 및 버퍼연마 과정을 거침으로써, 고온 내마모성과 내열성 및 내열충격성을 지니는 허스롤을 얻을 수가 있다.When the plasma spray coating is completed under the conditions described above, the hearth roll having high temperature wear resistance, heat resistance and thermal shock resistance may be obtained by performing a grinding process and a buffer polishing process for forming roughness of the coating layer through a calcination process.

하기 [표 2]는 본 발명에 의한 용사코팅방법에 의해 얻어진 시료와 종래의 용사코팅방법에 의해 얻어진 시료를 각각 열충격시험한 결과를 비교하여 나타내 보인 것이다.Table 2 shows the results obtained by comparing the thermal shock test results of the samples obtained by the spray coating method according to the present invention with the samples obtained by the conventional spray coating method.

구 분division 용 사 피 막Veteran coat 시 험 조 건Exam conditions 본드코팅층Bond Coating Layer 톱코팅층Top Coating Layer 800℃/수냉 20회800 degrees Celsius / water cooling 20 times 1000℃/ 수냉 10회1000 ℃ / water cooling 10 times 발명예1Inventive Example 1 CoNiCrAIYCoNiCrAIY CoCrAIY+(Al203-Cr3C2)CoCrAIY + (Al 2 0 3 -Cr 3 C 2 ) 20회까지 이상무No more than 20 times 10회까지 이상무No more than ten times 발명예2Inventive Example 2 CoNiCrAIYCoNiCrAIY CoCrAIY+(Cr3C2-NiCr)CoCrAIY + (Cr 3 C 2 -NiCr) 20회까지 이상무No more than 20 times 10회까지 이상무No more than ten times 발명예3Inventive Example 3 CoNiCrAIYCoNiCrAIY CoCrAIY+(Cr3C2-NiCr)CoCrAIY + (Cr 3 C 2 -NiCr) 20회까지 이상무No more than 20 times 10회까지 이상무No more than ten times 발명예4Inventive Example 4 CoNiCrAIYCoNiCrAIY Cr3C2-NiCrCr 3 C 2 -NiCr 20회까지 이상무No more than 20 times 8회에서 크랙/박리 발생Crack / peel out in 8 times 발명예5Inventive Example 5 Cr3C2-NiCrCr 3 C 2 -NiCr Cr3C2-NiCrCr 3 C 2 -NiCr 20회까지 이상무No more than 20 times 10회에서 크랙/박리 발생Crack / peel out of 10 times 발명예6Inventive Example 6 MCrAIYMCrAIY Cr3C2-NiCrCr 3 C 2 -NiCr 20회까지 이상무No more than 20 times 10회까지 이상무No more than ten times 비교예1Comparative Example 1 탄화물층Carbide layer Al2O3-ZrO2 Al 2 O 3 -ZrO 2 2회에서 크랙/박리 발생Crack / peel out in two 비교예2Comparative Example 2 탄화물층Carbide layer SiO2-ZrO2 SiO 2 -ZrO 2 3회에서 크랙/박리 발생Crack / peel out in three times

열충격시험은 탄소강 파이프에 상기 [표 2]에서와 같은 용사피막을 형성한 다음 ø173 x 40 x 10t 규격으로 시편을 제작하여 약 800℃의 분위기로에서 10분간 유지시킨 다음 수냉하는 방법으로 20회를 반복하여 크랙 및 박리 현상이 나타나는 결과를 측정하였고, 또한 동일한 규격의 시료를 약 1000℃ 분위기로에서 10분 유지시킨 다음 수냉하는 방법으로 10회를 반복하여 크랙 및 박리 현상이 나타나는 결과를 측정하였다.Thermal shock test is to form a thermal spray coating on the carbon steel pipe as shown in [Table 2], and then to produce a specimen in the ø173 x 40 x 10t standard to maintain for 10 minutes in an atmosphere of about 800 ℃ and 20 times by the water cooling method The results of repeated cracks and delamination were measured, and the results of cracks and delamination were repeated 10 times by holding a sample of the same specification in an atmosphere of about 1000 ° C. for 10 minutes and then water-cooling.

열충격시험 결과에 따르면, 상기 [표 2]에서 보는 바와 같이 본 발명에 의한 용사코팅방법에 의한 발명예 1 내지 6의 시료는, 기존의 용사코팅방법에 의한 비교예 1 및 2의 시료에 비하여 내열충격성이 우수하다는 것을 알 수가 있다.According to the thermal shock test results, as shown in the above [Table 2], the samples of the invention examples 1 to 6 by the thermal spray coating method according to the present invention, compared with the samples of the comparative examples 1 and 2 by the conventional thermal spray coating method It can be seen that the impact properties are excellent.

이상에서 설명된 바와 같이 본 발명에 의한 허스롤의 용사코팅방법에 따르면, 본드코팅층과 톱코팅층을 각각 내열성이 우수한 CoNiCrAlY 용사분말과 Cr3C2-NiCr써어맷 및 CoNiCrAlY를 혼합한 용사분말을 플라즈마 용사 코팅하여 형성함으로써, 기존 용사코팅방법에 의해 적용되는 탄화물 코팅층 등에 비하여 용착율을 높이고, 내부 응력을 최소화하여 우수한 내열충격성을 부여할 수 있으며, 일정한 표면조도를 얻을 수가 있어 냉연강판 등의 이송시 내슬립성이 향상시킬 수가 있다.According to the thermal spray coating method of the hearth roll according to the present invention as described above, the thermal spray coating powder and Co 3 Cr 2 -NiCr thermistor and CoNiCrAlY are sprayed into the bond coating layer and the top coating layer, respectively. By forming by thermal spray coating, it is possible to increase the welding rate compared to the carbide coating layer applied by the conventional thermal spray coating method, to impart excellent thermal shock resistance by minimizing the internal stress, and to obtain a constant surface roughness to transfer cold rolled steel sheet, etc. Slip resistance can be improved.

본 발명은 상술한 특정의 바람직한 실시예에 한정되지 아니하며, 청구범위에서 청구하는 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 기술 분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변형 실시가 가능한 것은 물론이고,그와 같은 변경은 기재된 청구범위 내에 있게 된다.The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes are intended to fall within the scope of the claims set forth.

Claims (9)

허스롤의 표면에 CoNiCrAlY 성분의 용사 분말을 용사 코팅하여 본드코팅층을 형성하고, 상기 본드코팅층 위에 Cr3C2-NiCr과 CoNiCrAlY가 혼합된 용사분말을 용사 코팅하여 톱코팅층을 형성하는 것을 특징으로 하는 허스롤의 용사코팅방법.A thermal spray coating of CoNiCrAlY component sprayed powder is formed on the surface of the hearth roll, and a top coating layer is formed by thermally coating the sprayed powder mixed with Cr 3 C 2 -NiCr and CoNiCrAlY on the bond coating layer. Thermal spray coating method of hearth roll. 제1항에 있어서,The method of claim 1, 상기 본드코팅층은 Ni; 30 ~ 35wt%, Cr; 20 ~ 25wt%, Al; 10 ~ 6wt%, Y; 1 ~ 0.1wt% 및 나머지가 Co로 이루어진 조성범위의 용사재로 형성하는 것을 특징으로 하는 허스롤의 용사코팅방법.The bond coating layer is Ni; 30-35 wt%, Cr; 20-25 wt%, Al; 10-6 wt%, Y; 1 ~ 0.1wt% and the remainder of the spray coating method of the hearth roll, characterized in that formed by the thermal spraying material of the composition range consisting of Co. 제1항에 있어서,The method of claim 1, 상기 톱코팅층은 Ni; 24.0 ~ 25.5wt%, C; 8.0 ~ 9.5wt%, 나머지가 Cr로 이루어진 용사재와, Ni; 30 ~ 35wt%, Cr; 20 ~ 25wt%, Al; 10 ~ 6wt%, Y; 1 ~ 0.1wt% 및 나머지가 Co로 이루어진 용사재가 혼합된 용사재로 형성하는 것을 특징으로 하는 허스롤의 용사코팅방법.The top coating layer is Ni; 24.0 to 25.5 wt%, C; 8.0-9.5 wt%, the remainder of which is made of Cr, Ni; 30-35 wt%, Cr; 20-25 wt%, Al; 10-6 wt%, Y; 1 ~ 0.1wt% and the remainder of the thermal spray coating method of the hearth roll, characterized in that the thermal spraying material is formed of a mixture of Co. 허스롤의 표면에 CoAl-Cr3C2성분의 용사분말을 용사 코팅하여 본드코팅층을형성하고, 상기 본드코팅층 위에 CoAl-Cr3C2Al2O3성분의 용사분말을 용사 코팅하여 톱코팅층을 형성한 다음, 650 ±10℃에서 110 내지 130분간 가열 소성하는 것을 특징으로 하는 허스롤의 용사코팅방법.A thermal spray coating of CoAl-Cr 3 C 2 component is formed on the surface of the hearth roll to form a bond coating layer, and a thermal spray coating of CoAl-Cr 3 C 2 Al 2 O 3 component is spray coated on the bond coating layer to form a top coating layer. After the formation, the thermal spray coating method of the heath roll, characterized in that the heating and baking at 650 ± 10 ℃ 110 to 130 minutes. 제1항 또는 제2항에 있어서,The method according to claim 1 or 2, 상기 본드코팅층은 CoCrAl-Cr3C2계 써어맷, CoCrAlY, Cr3C2-NiCr, MCrAlY 중 적어도 하나 이상이 혼합된 성분의 용사분말을 용사 코팅하여 형성한 것을 특징으로 하는 허스롤의 용사코팅방법.The bond coating layer is a thermal spray coating of the hearth roll, which is formed by spray coating a spray powder of a component in which at least one of CoCrAl-Cr 3 C 2 based cermet, CoCrAlY, Cr 3 C 2 -NiCr, and MCrAlY is mixed. Way. 제1항 또는 제2항에 있어서,The method according to claim 1 or 2, 상기 톱코팅층은 CoCrAl-Al2O3-Cr3C2, Cr3C2-NiCr, MCrAlY중 적어도 하나 이상이 혼합된 성분의 용사분말을 용사 코팅하여 형성한 것을 특징으로 하는 허스롤의 용사코팅방법.The top coating layer is a thermal spray coating of the hearth roll, characterized in that the thermal spray coating of the spray powder of a component in which at least one of CoCrAl-Al 2 O 3 -Cr 3 C 2 , Cr 3 C 2 -NiCr, MCrAlY is mixed Way. 제1항 또는 제2항에 있어서,The method according to claim 1 or 2, 상기 톱코팅층은 70 ±30㎛ 범위의 두께로 형성하는 것을 특징으로 하는 허스롤의 용사코팅방법.The top coating layer is spray coating method of the hearth roll, characterized in that to form a thickness in the range of 70 ± 30㎛. 제1항 또는 제2항에 있어서,The method according to claim 1 or 2, 상기 톱코팅층은 Ra 8 ±4㎛ 범위의 표면조도를 가지도록 형성되는 것을 특징으로 하는 허스롤의 용사코팅방법.The top coating layer is a thermal spray coating method of the hearth roll characterized in that it is formed to have a surface roughness of Ra 8 ± 4㎛ range. 제1항 또는 제2항에 있어서,The method according to claim 1 or 2, 상기 톱코팅층 위에 Cr3C2-NiCr성분의 용사분말을 용사 코팅하여 제2톱코팅층을 더 형성하는 것을 특징으로 하는 허스롤의 용사코팅방법.The thermal spray coating method of the hearth roll, characterized in that to form a second top coating layer by thermally coating the thermal spray coating of Cr 3 C 2 -NiCr component on the top coating layer.
KR10-2001-0060414A 2001-09-28 2001-09-28 A spray coating method for hearth roll KR100439411B1 (en)

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KR100825509B1 (en) * 2006-08-22 2008-04-25 홍명수 Journal bearing of plating equipment and method of manufacturing the same
CN102094163A (en) * 2011-02-25 2011-06-15 中国科学院金属研究所 CoNiCrAlY corrosion-resistant thermal spraying alloy powder and preparation method thereof
CN116288111A (en) * 2023-02-17 2023-06-23 沈阳富创精密设备股份有限公司 Process for preparing composite coating by plasma spraying and film deposition

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KR101180255B1 (en) 2009-12-29 2012-09-05 재단법인 포항산업과학연구원 Coated roll having excellent anti-dross property and anti-peeling property and coating method

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KR100825509B1 (en) * 2006-08-22 2008-04-25 홍명수 Journal bearing of plating equipment and method of manufacturing the same
CN102094163A (en) * 2011-02-25 2011-06-15 中国科学院金属研究所 CoNiCrAlY corrosion-resistant thermal spraying alloy powder and preparation method thereof
CN116288111A (en) * 2023-02-17 2023-06-23 沈阳富创精密设备股份有限公司 Process for preparing composite coating by plasma spraying and film deposition

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