KR20000039442A - Method for coating hearth roll having excellent hardness of high temperature using high pressure high velocity oxygen fuel spraying - Google Patents
Method for coating hearth roll having excellent hardness of high temperature using high pressure high velocity oxygen fuel spraying Download PDFInfo
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- KR20000039442A KR20000039442A KR1019980054786A KR19980054786A KR20000039442A KR 20000039442 A KR20000039442 A KR 20000039442A KR 1019980054786 A KR1019980054786 A KR 1019980054786A KR 19980054786 A KR19980054786 A KR 19980054786A KR 20000039442 A KR20000039442 A KR 20000039442A
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- coating
- hearth roll
- heat
- resistant metal
- high temperature
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/129—Flame spraying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
- B05B7/20—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion
- B05B7/201—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion downstream of the nozzle
- B05B7/205—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion downstream of the nozzle the material to be sprayed being originally a particulate material
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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
Abstract
Description
본 발명은 냉연 공장의 연속소둔 라인에 설치된 허스롤(Hearth Roll)의 표면에 실시하는 코팅방법에 관한 것으로, 보다 상세하게는 초고속 화염 용사법에 의해 롤 표면에 코팅을 실시함으로써 표면조도와 고온경도가 높은 허스롤을 얻기 위한 코팅 방법에 관한 것이다.The present invention relates to a coating method applied to the surface of the hearth roll (Hearth Roll) installed in the continuous annealing line of the cold rolling mill, and more specifically, the surface roughness and high temperature hardness by coating the surface of the roll by the ultra-fast flame spraying method A coating method for obtaining a high hearth roll.
허스롤(Hearth Roll)이란 연속소둔로 내부에 설치되어 강판의 이송시 안내 역할을 한다. 연속소둔로 안의 분위기 가스로는 강판의 산화를 방지하기 위하여 이슬점 온도(Dew Point)가 -20℃ 이하인 N2+(3∼5)%H2가 사용되고, 그 내부의 온도는 약 500∼1000℃이다.Hearth roll is installed inside the continuous annealing furnace and serves as a guide during the transfer of the steel sheet. As an atmosphere gas in the continuous annealing furnace, in order to prevent oxidation of the steel sheet, N 2 + (3 to 5)% H 2 having a dew point of -20 ° C or lower is used, and the temperature therein is about 500 to 1000 ° C. .
이 롤의 표면은 높은 표면조도(Ra)를 요구하는 데, 그 이유는 조도가 높아야 강판의 사행(옆으로 미끄러지는 것)을 방지할 수 있기 때문이다.The surface of this roll requires high surface roughness (Ra), because the roughness can be prevented from meandering (sliding to the side) of a steel plate.
특히 이 코팅은 높은 고온경도 유지가 필요한 데, 그 이유는 고온경도가 높아야 장시간 작업 후에도 표면조도를 유지할 수 있기 때문이다.In particular, the coating needs to maintain a high temperature hardness, because the high temperature hardness can maintain the surface roughness even after a long time.
현재 이 코팅의 수명은 표면조도(Ra)가 5 ㎛ 이하로 떨어지면 일반적으로 교체한다.The life of this coating is now generally replaced when the surface roughness (Ra) drops below 5 μm.
허스롤 코팅에 관한 연구를 통하여 여러가지 종류의 코팅이 연구 개발되었는데, 이러한 코팅은 폭발용사(Detonation Gun Spraying), 플라즈마 용사(Plasma Spraying) 등을 이용하여 롤의 표면에 실시하여 얻어지는 것이다.Various types of coatings have been researched and developed through research on the hearth roll coating, which is obtained by applying the surface of the roll by using detonation gun spraying, plasma spraying, or the like.
공지기술로서 최근 일본에서 공개된 특개평 7-003426에서는 SiO2를 함유하는 허스롤 코팅을 제시하고 있고, 일특개평 7-003425 에서는 ZrO2계통의 코팅을 실시하는 것을 제시하고 있으며, 미국 특허 제 5,418,025호에서는 ZrSiO4계의 코팅을 제시하고 있다.As a well-known technique, Japanese Patent Laid-Open No. Hei 7-003426 recently disclosed in Japan discloses a hearth roll coating containing SiO 2, and Japanese Patent Application Laid-open No. Hei 7-003425 proposes a ZrO 2 -based coating, which is disclosed in US Patent No. 5,418,025. The issue presents a coating of ZrSiO 4 system.
한편, 대한민국특허 제92020호(내빌드업성 및 내열충격성이 우수한 탄화크롬계 서메트 코팅제 및 그 구성분말의 제조방법)에서는 Cr2C를 이용한 탄화물계 허스롤 코팅에 대해 제시하고 있다.On the other hand, Korean Patent No. 9020 (Chromium carbide-based cermet coating agent having excellent build-up resistance and thermal shock resistance and a method of preparing the constituent powder) discloses a carbide-based hearth roll coating using Cr 2 C.
그러나 플라즈마 용사코팅방법에 의하면 코팅 내부에 기공이 다수 존재하고(약 5%), 경도가 낮으며, Cr3C2가 분해되는 등의 문제가 있었고, 폭발용사방법은 미국의 유니온 카바이드(Union Carbide)사에서만 실시되어, 일반 업체에서는 용이하게 코팅을 실시할 수 없었다.However, according to the plasma spray coating method, many pores exist in the coating (about 5%), the hardness is low, and Cr 3 C 2 is decomposed, and the explosion spraying method is Union Carbide of the United States. It was carried out only at the company, and the general company could not easily apply the coating.
본 발명은 이러한 문제를 해결하기 위해서 이루어진 것으로, 초고속 화염 용사법을 이용하여 코팅의 고온경도를 높이고, 기공의 양을 적게 하고, 카바이드의 분해를 적게 하는 허스롤 코팅방법을 제공하는 데 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object thereof is to provide a hearth roll coating method that uses a high-speed flame spraying method to increase the high temperature hardness of the coating, reduce the amount of pores, and reduce the decomposition of carbides. .
상기 목적을 달성하기 위한 본 발명의 초고속 화염 용사법을 이용한 허스롤 코팅방법은, 냉연 공정라인의 허스롤 표면을 코팅함에 있어서, 초고속 화염 용사법을 이용하여 입도가 20∼55㎛ 인 내열금속분말로 두께 30∼70㎛ 의 본드코팅을 형성한 후, 그 위에 입도가 20∼55㎛인 Cr3C2-xM(내열금속)(여기서, x는 20-25중량%) 분말로 40∼100㎛ 두께의 상부코팅을 형성하는 것을 특징으로 하는 구성이다.The hearth roll coating method using the ultra-fast flame spraying method of the present invention for achieving the above object is a heat-resistant metal powder having a particle size of 20 to 55 μm using an ultra-high-speed flame spraying method in coating the hearth roll surface of a cold rolling process line. After forming a bond coating of 30 to 70 탆, a 40 to 100 탆 thick powder of Cr 3 C 2 -xM (heat resistant metal) (where x is 20-25% by weight) having a particle size of 20 to 55 탆. It is a configuration characterized by forming an upper coating.
본 발명에서는 Cr3C2-M(내열금속)으로 이루어진 상부 코팅만으로는 코팅 후 표면조도를 크게 할 수 없어, 상부코팅전에 본드코팅을 실시함으로써, 상부 코팅(Cr3C2-xM(내열금속))실시후 표면조도 (Ra)를 6∼8㎛ 로 유지하고자 한다.In the present invention, only the top coating made of Cr 3 C 2 -M (heat-resistant metal) can not increase the surface roughness after coating, by performing a bond coating before the top coating, the top coating (Cr 3 C 2 -xM (heat-resistant metal) The surface roughness (Ra) is to be maintained at 6 to 8 µm after the implementation.
이하에서는 양호한 실시예와 관련하여 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to preferred embodiments.
본 발명은 초고속 화염 용사법(High Pressure High Velocity Oxygen Fuel Spraying)을 이용하여 Cr3C2-M(내열금속)코팅을 형성하는 허스롤 코팅방법으로, 입도가 20-50㎛인 내열금속분말입자를 이용하여 허스롤 표면에 본드코팅을 형성하고, 그 위에 입자크기가 20∼50㎛인 Cr3C2-xM(내열금속)(여기서, x는 20-25중량%) 입자를 이용하여 두께 40∼100㎛의 코팅을 형성하면, 기존의 코팅보다 고온 경도가 높고, 높은 표면조도를 유지할 수 있다.The present invention is a Hurs roll coating method for forming a Cr 3 C 2 -M (heat-resistant metal) coating by using a High Pressure High Velocity Oxygen Fuel Spraying, heat-resistant metal powder particles having a particle size of 20-50㎛ To form a bond coating on the surface of the hearth roll, using a particle having a particle size of 20 to 50 µm and a thickness of 40 to 40 using Cr 3 C 2 -xM (heat resistant metal) particles (where x is 20-25% by weight). When forming a coating of 100㎛, high temperature hardness is higher than the existing coating, it is possible to maintain a high surface roughness.
이 코팅은 대표적으로 허스롤 표면의 코팅으로 사용되고, 강판과의 접촉에서 비롯되는 빌드업(Build-up) 현상을 줄이는 작용을 하고 있다.This coating is typically used as a coating for the hearth roll surface, and serves to reduce build-up caused by contact with steel sheets.
본 발명에서는 허스롤에 실시하는 상부코팅용 분말로 Cr3C2-M(내열금속) 분말을 사용하는데, 이때 여기에 사용되는 내열금속(M)은 NiCr으로 제한되지 않고, NiCr, NiCrAl, NiCrAlY, FeCr, FeCrAl, FeCrAlY중의 하나, 또는 2 개 이상의 복합분말을 사용하여도 된다.In the present invention, Cr 3 C 2 -M (heat resistant metal) powder is used as the upper coating powder to be applied to the hearth roll, wherein the heat resistant metal (M) used herein is not limited to NiCr, but NiCr, NiCrAl, NiCrAlY One of FeCr, FeCrAl, FeCrAlY, or two or more composite powders may be used.
이는 내열금속(M)이 Cr3C2의 바인더(Binder)로 작용하기 때문이며, 상기와 같은 복합금속분말을 사용하여도 그다지 큰 차이가 없기 때문이다.This is because the heat-resistant metal (M) acts as a binder (Binder) of Cr 3 C 2 , even if using a composite metal powder as described above does not have a significant difference.
또한, 본 발명에서 초고속 화염 용사방법에 의하여 Cr3C2-M(내열금속) 분말입자를 허스롤에 상부코팅시 M(내열금속)의 양은 20-25중량% 인 분말을 사용하는 것이 바람직하다.In addition, in the present invention, when the upper coating of Cr 3 C 2 -M (heat-resistant metal) powder particles on the hearth roll by the ultra-fast flame spraying method, the amount of M (heat-resistant metal) is preferably used powder of 20-25% by weight. .
본발명에서는 상부코팅을 실시하기 전에 입자크기가 20-55㎛인 내열금속(M)분말을 이용하여 본드코팅을 실시하여 고온경도가 높고, 표면조도(Ra)가 6-8㎛인 허스롤 코팅이 가능하다. 본드코팅의 두께는 30-70㎛으로 하는 것이 바람직하다.In the present invention, before the top coating is performed, a bond coating is performed using a heat-resistant metal (M) powder having a particle size of 20-55 μm, and the high temperature hardness is high. This is possible. The thickness of the bond coating is preferably 30-70 탆.
이때 본드코팅을 위하여 사용하는 내열금속은 NiCr, NiCrAl, NiCrAlY, FeCr, FeCrAl, FeCrAlY중의 하나, 또는 2개 이상의 복합분말을 사용하는 것이 바람직하다.In this case, the heat-resistant metal used for the bond coating is preferably one of NiCr, NiCrAl, NiCrAlY, FeCr, FeCrAl, FeCrAlY, or two or more composite powders.
이하에서는 실시예와 관련하여 본 발명을 보다 상세하게 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.
실시예Example
본 발명에서는, SCH22(고Ni, Cr, C강)등의 내열강 위에 우선 알루미나 입자가 약 85∼100㎛인 것을 사용하고 공기압을 5Kg/㎠ 이상으로하여 블라스팅(Blasting)하여 표면을 거칠게 함으로써 발명재와 비교재에 대해 코팅전처리를 실시한다. 그 때 조도를 나타내는 Ra가 약 12∼15㎛인지를 확인한다.In the present invention, alumina particles of about 85 to 100 µm are first used on heat-resistant steel such as SCH22 (high Ni, Cr, C steel), and the surface is roughened by blasting at an air pressure of 5 Kg / cm 2 or more to roughen the surface. The coating and pretreatment were carried out on the and the comparative material. At that time, it is confirmed whether Ra which shows roughness is about 12-15 micrometers.
코팅실시 후 조도가 Ra가 6∼8㎛ 이 되도록 하기 위하여 연마(Buffing)를 실시한다. 연마재는 다이아몬드를 함유한 연마천으로 실시한다. 코팅을 실시후에 조직검사, 상온경도, 고온경도, 내열충격성 시험을 실시한다.After coating, roughening is performed to make roughness Ra be 6 to 8 μm. The abrasive is carried out with an abrasive cloth containing diamond. After coating, biopsy, room temperature hardness, high temperature hardness and thermal shock resistance test are performed.
종래재는 분말입자의 크기가 30∼150㎛ 인 Cr3C2-25NiCr을 사용하여 플라즈마 용사(Plasma Spraying)코팅을 약 100㎛ 실시한다. 코팅장치로서 술쩌 메코(Sulzer Metco)사의 PT-M1000을 사용하여 Ar, He 가스를 플라즈마가스로하여 플라즈마 용사코팅을 실시하였다. 즉, 1차가스(Primary Gas)로 Ar 가스를 사용하여 5kg/㎠, 50SLPM(standard liter per minute)로하여 코팅을 실시하고, 2차가스(Secondary Gas)로 He 가스를 사용하여 5kg/㎠, 85 SLPM으로 실시하며, 용사장치의 전압은 62 V, 전류는 650A으로 하였다. 용사분말의 공급양은 21g/min로 하였고, 용사거리는 100㎜로 하였다.Conventionally, plasma spraying coating is performed using Cr 3 C 2 -25 NiCr having a powder particle size of 30 to 150 μm, about 100 μm. Plasma spray coating was performed using Ar and He gas as plasma gas using PT-M1000 of Sulzer Metco. In other words, 5kg / ㎠, using Ar gas as primary gas, 50SLPM (standard liter per minute) to coat, 5kg / ㎠, using He gas as secondary gas (Secondary Gas), It was carried out at 85 SLPM, and the voltage of the thermal spraying device was 62 V and the current was 650 A. The supply amount of the sprayed powder was 21 g / min, and the spraying distance was 100 mm.
발명재 및 비교재의 본드코팅은 분말의 크기가 20∼55㎛인 NiCr 분말을 이용하여 30㎛ 두께의 코팅을 실시한다. 코팅조건은 다음과 같다.Bond coating of the invention material and the comparative material is carried out with a coating of 30㎛ thickness using NiCr powder having a powder size of 20 ~ 55㎛. Coating conditions are as follows.
산소 : 1940 scfh(standard cubic feet per hour)Oxygen: 1940 scfh (standard cubic feet per hour)
석유 : 5.5 갤론(gallon) /hourPetroleum: 5.5 gallons / hour
용사거리 : 380㎜Spraying distance: 380㎜
또한, 비교재는 분말의 입도가 10∼45㎛인 CrxCy-NiCr 분말을 이용하여 초고속 화염 용사를 실시한 것으로 코팅 조건은 다음과 같다.In addition, the comparative material was subjected to ultra-fast flame spraying using Cr x C y -NiCr powder having a particle size of 10 ~ 45㎛ powder coating conditions are as follows.
석유 : 6.0갤론(gallon)/hrPetroleum: 6.0 gallons / hr
산소 : 1850 scfhOxygen: 1850 scfh
용사거리 : 360 ㎜Spraying distance: 360 mm
바렐 길이 : 8 인치(inch)Barrel Length: 8 inches
발명재에서 상부코팅을 실시하기 위한 초고속 화염용사 코팅조건은 분말입자크기가 20-55㎛인 것을 사용하는 것외에는 비교재와 동일하나 다음 표1에 나타낸 바와 같은 성분의 용사분말을 사용하여 코팅을 실시하고, 상온강도, 고온경도, 내열충격성을 측정하였다.Ultrafast flame spray coating conditions for the top coating in the invention is the same as the comparative material except that the powder particle size is 20-55㎛, but the coating using a spray powder of the components as shown in Table 1 At room temperature strength, high temperature hardness and thermal shock resistance were measured.
상온경도는 비커스(Vickers) 경도기를 이용하여 측정하였고, 고온 경도는 니콘(Nikon)사의 비커스 고온경도기를 이용하였다. 내열충격 시험은 코팅시편의 크기를 30㎜×30㎜의 크기로 절단하여 900℃의 로에서 20분간 유지시킨후, 물속에 수냉하는 과정을 20회까지 반복하여, 내열충격 시험후 보이는 크랙이나 박리가 일어나는 횟수로 내열충격성을 평가하였다.The room temperature hardness was measured using a Vickers hardness tester, the high temperature hardness was used a Vickers high temperature hardness tester of Nikon. The thermal shock test is to cut the size of the coated specimen into a size of 30 mm x 30 mm, hold it in a furnace at 900 ° C for 20 minutes, and repeat the process of water-cooling in water up to 20 times. The thermal shock resistance was evaluated by the number of times that occurred.
상기와 같은 코팅조건 중 CrxCy-NiCr중 NiCr의 양이 30 중량%인 경우(비교재1)는 고온경도가 낮고 열충격 시험에서 박리가 발생하였고, 비교재2,3은 고온에서 코팅이 이루어지지 않았다. NiCr의 양이 15중량%(비교재4)인 경우는 코팅 내에 금속성분이 적어 열충격에 약하였고, 조직이 좋지 않았다. 본드 코팅이 없는 코팅(비교재5,6)은 열충격 시험에서 박리가 발생하였다.Among the coating conditions described above, when the amount of NiCr in Cr x C y -NiCr was 30% by weight (Comparative Material 1), high temperature hardness was low and peeling occurred in the thermal shock test, and Comparative Materials 2 and 3 were coated at high temperature. It was not done. When the amount of NiCr was 15% by weight (Comparative Material 4), there was little metal in the coating, so it was weak to thermal shock, and the structure was not good. The coating without the bond coating (Comparative Materials 5, 6) generated peeling in the thermal shock test.
이에 대해 상부코팅전에 허스롤 표면에 NiCr 코팅재로 본드코팅을 실시하고 20-25중량%인 NiCr을 함유한 CrxCy-M(내열금속) 코팅분말을 사용하여 상부코팅을 실시한 발명재 1,2의 경우 조직이 우수하고 박리발생이 없으며, 상온경도 및 고온경도가 모두 양호하였다.On the other hand, before the top coating, the surface of the hearth roll was coated with a NiCr coating material, and the top coating was performed using a Cr x C y -M (heat resistant metal) coating powder containing 20-25% by weight of NiCr. In case of 2, the structure was excellent and there was no peeling, and both the room temperature hardness and the temperature hardness were good.
따라서, 상기 설명한 바와 같은 본 발명에 의하면, 냉연공정의 소둔라인에 사용되는 허스롤 표면에 초고속 화염용사 코팅방법에 의해 내열금속을 사용하여 본드코팅후, 상부코팅을 실시하여 코팅을 형성하면, 고온경도가 높으며 내열충격성이 양호하며, 표면조도가 우수한 코팅을 형성할 수 있어서 허스롤의 수면을 연장할 수 있어서 냉연공정의 생산성을 향상시킬 수 있다.Therefore, according to the present invention as described above, after the hot coating using a heat-resistant metal on the surface of the hearth roll used in the annealing line of the cold rolling process using a heat-resistant metal, the top coating is performed to form a coating, It has high hardness, good thermal shock resistance, and can form a coating having excellent surface roughness, which can extend the surface of the hearth roll, thereby improving the productivity of the cold rolling process.
Claims (4)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019980054786A KR100347606B1 (en) | 1998-12-14 | 1998-12-14 | High temperature hardness hearth roll coating method using ultra-fast flame spraying |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1019980054786A KR100347606B1 (en) | 1998-12-14 | 1998-12-14 | High temperature hardness hearth roll coating method using ultra-fast flame spraying |
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| KR20000039442A true KR20000039442A (en) | 2000-07-05 |
| KR100347606B1 KR100347606B1 (en) | 2002-09-18 |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS595664B2 (en) * | 1980-02-20 | 1984-02-06 | 太平金属工業株式会社 | Heat-resistant and abrasion-resistant thermal spray material |
| JPS5970712A (en) * | 1982-10-13 | 1984-04-21 | Nippon Steel Corp | Hearth roll for continuous annealing furnace with superior wear resistance and build-up resistance |
| JPS62205223A (en) * | 1986-03-05 | 1987-09-09 | Kubota Ltd | Hearth roll for heat treatment furnace |
| JPH06116703A (en) * | 1992-10-01 | 1994-04-26 | Nittetsu Hard Kk | Hearth roller having heat resistance and wear resistance |
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