KR0124827B1 - Coating method for hearth roll - Google Patents

Coating method for hearth roll

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Publication number
KR0124827B1
KR0124827B1 KR1019940029114A KR19940029114A KR0124827B1 KR 0124827 B1 KR0124827 B1 KR 0124827B1 KR 1019940029114 A KR1019940029114 A KR 1019940029114A KR 19940029114 A KR19940029114 A KR 19940029114A KR 0124827 B1 KR0124827 B1 KR 0124827B1
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KR
South Korea
Prior art keywords
roll
coating
coated
steel sheet
zirconia
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KR1019940029114A
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Korean (ko)
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KR960017900A (en
Inventor
안지훈
이강호
박병학
Original Assignee
김만제
포항종합제철주식회사
신창식
재단법인산업과학기술연구소
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Priority to KR1019940029114A priority Critical patent/KR0124827B1/en
Publication of KR960017900A publication Critical patent/KR960017900A/en
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Publication of KR0124827B1 publication Critical patent/KR0124827B1/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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/04—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material
    • C23C28/042—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material including a refractory ceramic layer, e.g. refractory metal oxides, ZrO2, rare earth oxides
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/08—Oxides
    • C23C14/083—Oxides of refractory metals or yttrium
    • 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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/4805—Shape
    • H01L2224/4809—Loop shape
    • H01L2224/48091—Arched
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
    • H01L2224/732—Location after the connecting process
    • H01L2224/73251—Location after the connecting process on different surfaces
    • H01L2224/73265—Layer and wire connectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
    • H01L2924/181—Encapsulation

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • General Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Abstract

The invention relates to a method for coating Herth roll which conveys electrical steel sheets in a annealing furnace. The method comprises the steps of: coating Zr powder on the surface of Herth roll by a conventional plasma coating; coating a rolling oil on the coated roll; cracking at 400 deg.C under a nitrogen atmosphere for several times to remain sufficient carbon residue. The Zr coating and the carbon residue gives abrasion resistance and improved lubricating ability to Herth roll. respectively.

Description

고내마모성 및 고윤활성 허스롤 코팅방법High wear resistance and high lubricity hearth roll coating method

제1도는 소둔전 강판 표면에 철조각이 모습을 나타내는 사진Figure 1 is a photograph showing the appearance of iron on the surface of the steel sheet before annealing

제2도는 (가)는 지르코니아가 코팅된 종래의 허스롤의 표면에 철조각이 부착되어 있는 모습을 나타내는 사진.2 is a photograph showing the appearance that the iron piece is attached to the surface of the conventional hearth roll coated with zirconia.

(나)는 카본슬리브가 삽입된 종래의 허스롤 표면에 철조각이 부착되어 있는 모습을 나타내는 사진.(B) is a photograph showing the appearance of iron chips on the surface of a conventional hearth roll inserted with a carbon sleeve.

제3도는 종래 및 본 발명방법에 따라 코팅된 허스롤에 대한 마찰계수의 경사변화를 나타내는 그래프3 is a graph showing the gradient change of the coefficient of friction for the hearth roll coated according to the conventional and the present invention method

제4도는 본 발명방법에 따라 코팅된 허스롤 표면 상태를 나타내는 사진.4 is a photograph showing the state of the hearth roll surface coated according to the method of the present invention.

본 발명은 제철설비중 전기강판 소둔로에 사용되는 허스롤(Herth roll)의 코팅방법에 관한 것으로서, 보다 상세하게는 내마모성 및 윤활성이 우수한 허스롤의 코팅방법에 관한 것이다.The present invention relates to a method for coating a heart roll (Herth roll) used in an electric steel sheet annealing furnace in steelmaking facilities, and more particularly to a coating method of a hearth roll excellent in wear resistance and lubricity.

소둔용 이송롤(herth roll)은 제철소 내의 제철설비중 전기강판 소둔로에서 전기 강판의 이송을 목적으로 사용되고 있는데, 그 사용 특성상500-1100℃ 정도의 고온에서 사용되므로 고온에서 내마모성 취약한 금속이송롤에 고온 내마모성이 우수한 지르코니아를 세라믹 용사법을 이용하여 코팅처리되어 있다.The annealing feed roll (herth roll) is used for the transfer of electric steel sheet from the steel sheet annealing furnace in the steelmaking facilities in the steelworks, and because it is used at a high temperature of about 500-1100 ℃, Zirconia excellent in high temperature wear resistance is coated using a ceramic spraying method.

그런데, 상기 허스롤에 이해 이송되는 건기강판은 소둔전 제1도와 같은 철조각들이 강판 표면에 붙어있어, 강판의 소둔로내에서 이송중 요철이 심한 지르코니아 코팅표면과 이송중인 강판 표면과의 슬립에 의하여 철조각들이 이송롤 표면에 부착되고 이 부착된 철조각들은 강판의 자중에 의하여 이송롤 표면에 물리적으로 압착된다. 압착된 철조각위에 후속하여 유입되는 강판에 잔존하고 있는 새로운 철조각들이 부착하여 제2도(가)와 같은 커다란 이물질이 이송롤 표면에 형성된다. 강판에 부착된 철조각들은 이송롤에 적층되고 적층된 표면이 일부 산화하여 단단한 물질(Fe3O4)로 변하고 후속하여 유입되는 강판에 전사되어 핌플(pimple) 현상을 야기시켜 제품의 품질을 저하시키는 문제점이 있다.However, in the dry steel sheet conveyed to the hearth roll, iron pieces such as those of FIG. 1 before annealing are attached to the steel sheet surface, so that the slippage between the zirconia coated surface having a rough unevenness during conveying in the annealing furnace of the steel sheet and the steel sheet surface being conveyed. As a result, the iron pieces are attached to the surface of the feed roll, and the attached pieces are physically pressed onto the surface of the feed roll by the weight of the steel sheet. New pieces of iron remaining on the steel sheet flowing subsequent to the pressed pieces of iron are attached to form a large foreign object such as in FIG. The pieces of iron attached to the steel sheet are laminated on the feed roll, and the laminated surface is partially oxidized into a hard material (Fe 3 O 4 ), which is transferred to the steel sheet which is subsequently introduced, causing a pimple phenomenon, thereby degrading product quality. There is a problem.

한편, 이와같은 현상을 억제하기 위하여 종래에는 이송롤에 지르코니아 코팅 대신 표면의 윤활성이 좋은 카본슬리브를 이송롤에 끼워 철조각들의 부착을 어렵게하고 이솔롤에 부착한 후에도 조업도중 브러싱 작업으로 쉽게 이송롤 표면으로 부터 제이송롤에 부착한 후에도 조업도중 브러싱 작업으로 쉽게 이송롤 표면으로부터 제거될 수 있게 카본슬리브를 사용하였다. 이와같이 사용된 카본슬리브는 카본슬리브 표면에 철조각들의 부착은 현격히 줄어 들었으나 지르코니아 코팅에 비하여 경도가 낮고 기공율도 커서 카본슬리브에 부착된 철조각들 중 카본 슬리브의 기공이 있는 부분에 부착된 철조각들은 강판의 자중으로 카본슬리브에 침투하여 제2도(나)와 같이 형성되어 있어 여전히 강판에 핌플현상을 야기하는 문제점이 있다.On the other hand, in order to suppress such a phenomenon, it is difficult to attach iron pieces to the transfer roll by inserting a carbon sleeve having good lubricity on the transfer roll instead of the zirconia coating on the transfer roll, and easily transfer the brush to the brush during operation even after attaching it to the isol roll. The carbon sleeve was used so that it could be easily removed from the surface of the transfer roll by brushing during operation even after attaching it to the feed roller from the surface. The carbon sleeve used in this way has a significantly reduced adhesion of the iron pieces on the surface of the carbon sleeve, but has a lower hardness and a higher porosity than the zirconia coating, so that the iron pieces attached to the pores of the carbon sleeve are attached to the carbon sleeve. They penetrate the carbon sleeve by the weight of the steel sheet is formed as shown in Figure 2 (b) there is still a problem causing the pimple phenomenon in the steel sheet.

따라서, 본 발명은 상기한 문제점을 해결하기 위하여 제안된 것으로서, 이송롤 표면에 내마모용 코팅으로 지르코니아 코팅을 하여 철조각들이 침투를 억제하고, 그 위에 카본 코팅을 함으로써 이송롤에 윤활성을 부여하여 강판과 이송롤의 슬립에 의한 이송롤 표면에 철조각들이 부착을 어렵게 하고 일단 부착된 철조각들도 브러싱 박업에 의하여 이송롤로 부터 쉽게 제거되어 강판에 핌플 현상을 억제하는 허스롤 코팅방법을 제공하고자하는데, 그 목적이 있다.Therefore, the present invention has been proposed to solve the above problems, by applying a zirconia coating on the surface of the transfer roll to the zirconia coating to suppress the penetration of the iron pieces, by giving a carbon coating on the feed roll to give lubricity Iron pieces are difficult to attach to the surface of the transfer roll due to slippage of the steel plate and the transfer roll, and once the iron pieces are attached, they are easily removed from the transfer roll by brushing brushing to suppress the pimple phenomenon on the steel plate. There is a purpose.

이하 본 발명을 설명한다.Hereinafter, the present invention will be described.

본 발명은 소둔로내의 전기강판을 이송하는 허스롤의 코팅방법에 있어서, 상기 허스롤 표면에 지르코니아를 플라즈마 코팅한후 압연유를 도포한 다음 질소분위기하에서 300-400℃의 온도로 열분해하는 고내마모성 및 고윤활성 허스롤의 코팅방법에 관한 것이다.The present invention is a method for coating a hearth roll for conveying an electrical steel sheet in an annealing furnace, after the plasma coating of zirconia on the surface of the hearth roll, applying a rolling oil and then high abrasion resistance to thermal decomposition at a temperature of 300-400 ° C. under a nitrogen atmosphere. It relates to a coating method of a high lubrication hearth roll.

이하, 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail.

본 발명에서는 지르코니아분말을 플라즈마 코팅전 허스롤 표면의 거칠기 조성 및 표면청정을 위하여 먼저 롤 표면을 세척하는 것이 필요하다. 상기 세척방법은 여러가지 방법으로 가능한데, 예를들면 롤 표면을 알루미나 샌드를 이용하여 4-5Kgf/cm2의 공기압으로 그릿블라스팅하고 아세톤을 사용하여 초음파세척하는 방법을 들 수 있다.In the present invention, the zirconia powder needs to first wash the roll surface for the roughness composition and surface cleaning of the hearth roll surface before plasma coating. The washing method can be performed in various ways. For example, the surface of the roll may be grit blasted at an air pressure of 4-5 Kgf / cm 2 using alumina sand and ultrasonically cleaned using acetone.

상기 세척된 롤은 지르코니아 분말을 사용하여 Ar/H2플라즈마를 이용하여 통상의 방법으로 코팅하므로서 내마모성을 부여해준다. 이때 사용되는 지르코니아 분말은 통상의 지르코니아 분말을 사용가능한데, 예를들면 하기 표 1과 같은 분말을 사용할 수 있다.The washed roll is coated with a conventional method using Ar / H 2 plasma using a zirconia powder to give abrasion resistance. In this case, the zirconia powder used may be a conventional zirconia powder, for example, a powder such as Table 1 may be used.

이후, 코팅된 롤은 강판의 압연시 사용되는 압연유를 코팅롤위에 도포한 다음, 질소분위기하에서 300-400℃의 온도로 열분해시키면 잔류카본만 남게되는데, 이때 잔류카본의 양을 증진시켜 어느정도의 두께ㄱ까지 카본을 잔류시키도록 상기 열분해 과정을 여러차례 반복 실시함이 좋다.After that, the coated roll is coated with rolling oil used for rolling the steel sheet on the coating roll, and then thermally decomposed to a temperature of 300-400 ° C. under a nitrogen atmosphere, leaving only residual carbon, and increasing the amount of residual carbon to a certain thickness. The pyrolysis process may be repeated several times to leave carbon up to a.

이때, 상기 열분해온도가 300℃ 이하로 되면, 압연유의 열분해가 30분 정도의 단시간내에 이루어지지 않아 제품생산시간을 지연 시킬 수 있으며, 400℃ 이상에서는 압연유의 급격한 열분해로 인하여 상기 도포된 압연유가 허스롤 표면에 충분히 부착되지 않고 증발하여 충분한 잔류 카본을 남기기 위해 300-400℃의 온도범위로 열처리하는 것보다 수회 더 반복 코팅해야 되는 단점이 있다.At this time, when the pyrolysis temperature is 300 ℃ or less, the thermal decomposition of the rolling oil is not made within a short time of about 30 minutes to delay the product production time, at 400 ℃ or more due to the rapid thermal decomposition of the rolling oil the coated rolling oil huss There is a disadvantage in that the coating is repeated several times more than heat-treating to a temperature range of 300-400 ° C. in order to evaporate without leaving enough adhesion to the roll surface to leave sufficient residual carbon.

상기 열분해에 의한 카본코팅을 내마모성을 갖는 지르코니아 코팅에 윤활성을 향상시켜주는 역활을 하여 롤과 강판의 슬립에 의한 철조각들의 부착이 훨씬 감소되게 한다.The thermal decomposition of the carbon coating serves to improve the lubricity to the wear-resistant zirconia coating, so that the adhesion of the iron pieces by the slip of the roll and the steel sheet is much reduced.

이하, 본 발명을 실시예를 종하여 구체적으로 설명한다.Hereinafter, the present invention will be described in detail with reference to Examples.

실시예Example

허스롤과 같은 모재에 대하여 알루미나 샌드를 이용하여 4.5Kg/cm2의 공기압으로 그릿 블라스팅하고, 상기 모재를 아세톤에 담아 10분간 초음파세척하였다. 세척된 모재는 상기 표 1과 같은 조성을 갖는 지르코니아 분말을 사용하여 Ar/H2플라즈마를 이용하여 통상의 방법으로 코팅하여 종래재로 하였다. 또한 비료를 위하여 상기 코팅된 모재위에 강판의 압연시 사용되는 압연유를 도포한 다음 350℃의 질소분위기하에서 3회반복하여 열분해시켜 카본 코팅하여 발명재로 하였다.A base material such as a hearth roll was grit blasted at an air pressure of 4.5 Kg / cm 2 using alumina sand, and the base material was soaked in acetone and ultrasonically cleaned for 10 minutes. The washed base material was coated with a conventional method using Ar / H 2 plasma using a zirconia powder having a composition as shown in Table 1 to make a conventional material. In addition, after applying the rolling oil used in the rolling of the steel sheet on the coated base material for fertilizer and repeated three times under a nitrogen atmosphere of 350 ℃ thermally carbon coating was made as an invention material.

상기와같이 지르코니아로만 코팅된 종래재와 그 위에 본 발명에 따라 카본코팅된 발명재에 대하여 내마모 분석기를 이용하여 마찰계수가 안정될때까지 내마모분석을 하였으며 그후 각 시편간의 마찰계수를 비교하여 제3도에 나타내었다. 이때, 상기 마모시험 조건은 하기표 1와 같은 조건으로 행하였다.As described above, the conventional materials coated only with zirconia and the carbon coated invention according to the present invention were subjected to abrasion resistance analysis until the friction coefficient was stabilized by using the wear resistance analyzer, and then the friction coefficients between the specimens were compared. 3 is shown. At this time, the abrasion test conditions were carried out under the conditions shown in Table 1.

[표 2]TABLE 2

제3도에 나타난 바와같이, 카본으로 코팅된 발명재의 윤활성 여부를 판단하기 위하여 내마모시험을 한 결과, 본 발명재는 카본 코팅을 행하지 않은 종래재와 비교하여 마찰계수가 현격히 감소하였으며, 또한 종래재의 경우 시간이 경과함에 따라 마찰계수가 증가하였으나 발명재의 경우 거의 일정하여 카본코팅이 마모에 의하여 쉽게 제거되지 않음을 알 수 있었다.As shown in FIG. 3, as a result of the abrasion resistance test to determine the lubricity of the carbon coated invention material, the invention material significantly reduced the coefficient of friction compared to the conventional material without carbon coating. In this case, the friction coefficient increased with time, but it was found that the carbon coating is not easily removed by wear because the material is almost constant.

따라서, 코본코팅한 발명재의 경우에는 마찰계수가 훨씬 줄어들어 이송롤과 강판의 슬립에 의한 철조각들의 부착은 훨씬 감소될 것으로 생각되었으며, 실제로 제4도와 같이 지르코니아 코팅위에 타본 코팅된 허스롤에는 철조각이 거의 부착되지 않음을 확인할 수 있었다.Therefore, in the case of the co-coated invented material, the friction coefficient was considerably reduced and the adhesion of the iron pieces due to the slip of the feed roll and the steel sheet was considered to be much reduced. Actually, the iron pieces were coated on the hearth roll coated on the zirconia coating as shown in FIG. It could be confirmed that this was hardly attached.

상술한 바와같이, 본 발명은 내마모용 코팅으로 지르코니아 코팅을 하여 철조각들의 침투를 억제하고, 그 위에 카본코팅을 하므로서 이송롤에 윤활성을 부여하여 강판과 이송롤의 슬립에 의한 이송롤 표면에 철조각들의 부착을 어렵게하고 일단 부착된 철조각들도 브러싱 작업에 의하여 이송롤로 부터 쉽게 제거되어 강판의 핌플현상을 억제하는 효과가 있는 것이다.As described above, the present invention is to prevent the penetration of the iron pieces by the zirconia coating to the wear-resistant coating, and to provide a lubrication to the feed roll by the carbon coating on the surface of the feed roll by the slip of the steel sheet and the feed roll It is difficult to attach the iron pieces, and once attached, the iron pieces are also easily removed from the feed roll by the brushing operation to suppress the pimple phenomenon of the steel sheet.

Claims (1)

소둔로내의 전기강판을 이송하는 허스의 코팅방법에 있어서, 상기 허스롤 표면에 지르코니아를 플라즈마 코팅한 후 압연유를 도포한 다음 질소분위기하에서 300-400℃의 온도로 열분해함을 특징으로 하는 고내마모성 및 고윤활성 허스롤의 코팅방법.In the coating method of the hearth to transfer the electrical steel sheet in the annealing furnace, plasma-coated zirconia on the surface of the hearth roll and then coated with a rolling oil and then high thermal resistance to pyrolysis at a temperature of 300-400 ℃ under nitrogen atmosphere and Coating method of high lubrication hearth roll.
KR1019940029114A 1994-11-08 1994-11-08 Coating method for hearth roll KR0124827B1 (en)

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KR0124827B1 true KR0124827B1 (en) 1997-12-26

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