KR100339894B1 - Anticorrsion apparatus for heat treated rails - Google Patents
Anticorrsion apparatus for heat treated rails Download PDFInfo
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- KR100339894B1 KR100339894B1 KR1020000004596A KR20000004596A KR100339894B1 KR 100339894 B1 KR100339894 B1 KR 100339894B1 KR 1020000004596 A KR1020000004596 A KR 1020000004596A KR 20000004596 A KR20000004596 A KR 20000004596A KR 100339894 B1 KR100339894 B1 KR 100339894B1
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- rust
- rail
- oil
- rust preventive
- heat treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
본 발명은 연속적인 열처리 작업을 수행후 이송되는 열처리 완료된 직후의 레일 표면의 산화에 의해 발생되는 부식(녹)을 방지시킬 수 있는 열처리 레일의 방청장치에 관한 것으로 그 기술적인 구성은, 방청장치 본체부(20)의 좌우 및 상하측에는 분사노즐(30)이 설치되어, 상기 분사노즐(30)을 통해 방청장치 본체부(20)의 내부로 진입되는 열처리가 완료된 직후의 레일(10)의 표면에 방청유(40)가 일정량 분사토록 설치되며, 상기 방청장치 본체부(20)에 설치되는 분사노즐(30)은, 그 일단으로 방청유(40)의 유량을 조절하는 유량 조절밸브(50)를 개재하여 송유관(60)이 각각 연통 연설토록 되고, 상기 송유관(60)의 일단에는 방청유(40)를 공급하는 공급펌프 (70)를 개재하여 방청유 탱크(80)와 연통 연설토록 되는 것을 요지로 한다.The present invention relates to a rust preventive device of a heat treatment rail capable of preventing corrosion (rust) caused by oxidation of the surface of the rail immediately after completion of the heat treatment transferred after performing a continuous heat treatment operation. Injection nozzles 30 are provided on the left and right sides and upper and lower sides of the unit 20, and are provided on the surface of the rail 10 immediately after the heat treatment for entering the inside of the rust-preventing device main body 20 through the injection nozzles 30 is completed. The rust preventive oil 40 is installed to spray a predetermined amount, and the spray nozzle 30 installed in the rust preventive device main body 20 has a flow control valve 50 for controlling the flow rate of the rust preventive oil 40 at one end thereof. The oil supply pipe 60 is to be communicated with each other, and one end of the oil supply pipe 60 is to communicate with the rust prevention oil tank 80 via a supply pump 70 for supplying the rust prevention oil 40.
Description
본 발명은 각종 철도 레일의 열처리 완료된 직후 이송되는 열처리 레일 표면의 산화에 의해 발생되는 부식(녹)을 방지시킬 수 있는 열처리 레일의 방청장치에 관한 것으로 이는 특히, 레일 방청장치의 본체부 좌우 및 상하측으로 방청유이 분사되는 분사노즐이 각각 설치되고, 상기 각각의 분사노즐은 밸브를 개재하여 송유관과 연통 연설되며, 상기 송유관 일단에는 방청유를 공급하는 공급펌프 및 필터를 개재하여 방청유 탱크와 연설토록 됨으로 인하여, 열처리 작업의 완료후 이송되는 레일의 표면에 방청유 분사노즐을 통한 방청유를 분사하여, 열처리된 레일의 야드 적치시, 상기 레일 표면이 산화에 의해 발생되는 부식 발생을 미연에 예방함은 물론, 이에따라 열처리된 레일의 산화반응에 의한 기계적 성질의 저하를 방지하고, 상기 레일의 방청유 도포작업을 연속적으로 간편하게 수행할 수 있도록한 열처리 레일의 방청장치에 관한 것이다.The present invention relates to a rust prevention device of a heat treatment rail that can prevent corrosion (rust) caused by oxidation of the surface of the heat treatment rail that is transferred immediately after the completion of heat treatment of various railway rails, in particular, the left and right and top and bottom of the main body portion of the rail rust prevention device Since the injection nozzles are sprayed to each side, the rust preventive oil is installed, the respective injection nozzles are communicated with the oil supply pipe via a valve, and the end of the oil supply pipe through the supply pump and filter for supplying the rust preventive oil, and the speech to the anti-rust oil tank, After completion of the heat treatment operation, by spraying the rust-preventive oil through the anti-rust oil injection nozzle on the surface of the conveyed rail, when the yards of the heat-treated rails are applied, it prevents the occurrence of corrosion caused by the oxidation of the rail surface in advance, and accordingly Prevents deterioration of mechanical properties due to oxidation reaction of rails The present invention relates to a rust preventive device for a heat treatment rail, which can continuously and easily perform a coating operation.
일반적으로 알려져있는 철도 및 일반 산업용 레일은, 레일의 두부(頭部)상으로 차륜이 굴러가게 되는 관계로 그 두부를 경질의 금속으로 제작되도록 열처리 하며, 특히 철도 궤도의 고하중을 받는 부위와 급격한 곡선부에 부설되는 레일 및 분기기에 설치되는 레일은, 열차의 차륜과 극심한 마찰에 따른 레일 주행면의 마모가 극심하게 발생하게 되어, 레일의 두부를 열처리한 경두레일이 사용된다.Generally known railway and general industrial rails are heat-treated to be made of hard metal as the wheels are rolled on the heads of the rails. In the rails attached to the curved portion and the rails provided in the turnouts, wear of the rail running surface due to extreme friction with the wheels of the train occurs excessively, and a light rail that heat-treats the head of the rail is used.
한편, 상기와같은 레일의 열처리 작업시에는 라인으로 이송되는 레일의 두부를 일정온도 이상으로 가열한 후, 이를 적정한 냉각속도로 열처리 시키는 과정을 통해 경두레일이 생산되며, 상기와같이 열처리가 완료된 경두레일은 야드에 적치하여 필요에따라 사용하게 되는 것이다.On the other hand, during the heat treatment of the rail as described above, after the head of the rail transported to the line is heated to a predetermined temperature or more, the light rail is produced by the heat treatment at an appropriate cooling rate, the heat treatment is completed as described above The light rail is placed on the yard and used as needed.
그러나, 상기와같은 열처리 작업이 완료된 레일은 이를 야드에 적치하여 장기간 보관시, 상기 열처리된 레일의 표면으로 산화에 의한 부식(녹)이 쉽게 발생하게 되며, 상기와같은 경우 열처리된 레일의 재질에 치명적인 결함이 발생하게 되고, 레일의 품질을 크게 저하시키게 되는등 많은 문제점이 있었던 것이다.However, when the above heat treatment is completed, the rail is placed in a yard and stored for a long time, so that corrosion (rust) due to oxidation is easily generated on the surface of the heat treated rail. There were many problems such as fatal defects and deterioration of rail quality.
본 발명은 상기한 바와같은 종래의 여러 문제점들을 개선하기 위하여 안출된 것으로서 그 목적은, 열처리 작업의 완료후 이송되는 레일의 표면에 방청유 분사노즐을 통한 방청유를 분사하여, 열처리된 레일의 야드 적치시 레일 표면에 산화에 의해 발생되는 부식 발생을 미연에 예방함은 물론, 이에따라 열처리된 레일의 기계적 성질의 저하를 방지하고, 상기 레일의 방청유 도포작업을 연속적으로 간편하게 수행할 수 있는 열처리 레일의 방청장치를 제공하는데 있다.The present invention has been made in order to improve the various problems of the prior art as described above, the object is to spray the rust preventive oil through the anti-rust oil injection nozzle on the surface of the rail to be transported after completion of the heat treatment operation, when the yards of the heat treated rail Anti-corrosion device of the heat treatment rail that can prevent the corrosion caused by oxidation on the surface of the rail in advance, as well as to prevent the degradation of the mechanical properties of the heat treated rail and to continuously perform the anti-rust oil coating of the rail continuously To provide.
본 발명의 다른 목적은, 일반궤도에 설치된 레일의 표면으로 방청피막을 인위적으로 생성시켜 레일 표면의 부식발생을 방지할 수 있는 열처리 레일의 방청장치를 제공하는데 있다.Another object of the present invention is to provide an anti-corrosion apparatus for a heat-treated rail that can prevent the occurrence of corrosion of the rail surface by artificially creating an anti-corrosion coating on the surface of the rail provided in the general track.
도 1은 본 발명에 따른 열처리 레일의 방청장치를 설명하기 위한 개략 사시도.1 is a schematic perspective view for explaining the rust preventing device of the heat treatment rail according to the present invention.
도 2는 본 발명인 열처리 레일 방청장치의 개략 구성도.Figure 2 is a schematic configuration diagram of the heat treatment rail rust prevention apparatus of the present invention.
*도면의 주요 부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *
10...레일 20...방청장치 본체부10 ... rail 20 ... rust prevention unit
30...분사노즐 40...방청유30 ... Nozzle 40 ... Antirust oil
50...유량 조절밸브 60...송유관50 ... Flow control valve 60 ... Oil
70...공급펌프 80...방청유 탱크70 ... supply pump 80 ... antirust oil tank
90...필터 100...드레인 관90 filter 100 drain tube
상기 목적을 달성하기 위한 기술적인 구성으로서 본 발명은, 열처리된 레일이 이송롤러를 통해 내부로 이송토록 설치되는 레일 방청장치 본체부와,As a technical configuration for achieving the above object, the present invention, the rail rust prevention device body portion is installed so that the heat-treated rail is transferred to the inside through the feed roller,
상기 방청장치 본체부의 좌우 및 상하측으로 설치되어 방청유가 분사토록 설치되는 분사노즐과,Spray nozzles are installed to the left and right and up and down sides of the rust preventive device main body so that the rust preventive oil is sprayed,
상기 방청장치 본체부에 설치되는 분사노즐 일단으로 유량 조절밸브를 개재하여 각각 연통 연설되는 송유관과,An oil supply pipe communicating with one end of the injection nozzle installed in the rust preventive device through a flow control valve;
상기 송유관 일단에는 방청유를 공급하는 공급펌프 및 필터를 개재하여 연결 설치되는 방청유 탱크를 포함하여 구성되는 열처리 레일의 방청장치를 마련함에 의한다.One end of the oil pipe by providing a rust prevention device of the heat treatment rail comprising a rust prevention oil tank connected via a supply pump and a filter for supplying rust prevention oil.
이하, 첨부된 도면에 의거하여 본 발명의 실시예를 상세하게 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 1은 본 발명에 따른 열처리 레일의 방청장치를 설명하기 위한 개략 구성도이고, 도 2는 본 발명인 열처리 레일 방청장치의 개략 사시도로서, 열처리 완료된 직후의 레일(10)이 이송롤러(미도시)를 통해 내부로 이송토록 설치되는 방청장치 본체부(20)의 좌우 및 상하측에는 분사노즐(30)이 설치되어, 상기 분사노즐(30)을 통해 방청장치 본체부(20)의 내부로 진입되는 레일(10)의 표면에 친수성의 방청유(40)가 일정량 분사토록 설치된다.1 is a schematic configuration diagram for explaining the rust preventing device of the heat treatment rail according to the present invention, Figure 2 is a schematic perspective view of the heat treatment rail rust prevention device of the present invention, the rail 10 immediately after the heat treatment is completed feed roller (not shown) The injection nozzles 30 are installed on the left and right sides and the upper and lower sides of the rust preventive device main body 20 installed to be transported inwards through the rail, and the rail enters the inside of the rust preventive device main body 20 through the injection nozzle 30. On the surface of (10), hydrophilic antirust oil 40 is provided so that a fixed amount may be sprayed.
또한, 상기 방청장치 본체부(20)에 설치되는 분사노즐(30)은, 그 일단으로 방청유(40)의 유량을 조절하는 유량 조절밸브(50)를 개재하여 송유관(60)이 각각 연통 연설토록 되고, 상기 송유관(60)의 일단에는 방청유(40)를 공급하는 공급펌프 (70)를 개재하여 방청유 탱크(80)와 연통 연설토록 된다.In addition, the injection nozzle (30) installed in the rust preventive device main body 20, through the flow rate control valve 50 for regulating the flow rate of the rust preventive oil 40 at its one end so that the oil pipes 60 communicate with each other. One end of the oil supply pipe 60 communicates with the rust preventive oil tank 80 via a supply pump 70 for supplying the rust preventive oil 40.
이때, 상기 방청유 탱크(80)와 연설되는 송유관(60)은, 상기 방청유 탱크(80)와 공급펌프(70) 사이에 방청유(40)의 이물질을 제거하는 필터(90)가 설치되는 구성으로 이루어진다.At this time, the oil supply pipe 60 is struck with the rust preventive oil tank 80, the filter 90 for removing the foreign matter of the rust preventive oil 40 between the rust preventive oil tank 80 and the supply pump 70 is configured. .
도면중 미설명 부호인 100은, 상기 방청장치 본체부(20)의 저부(底部)에 형성되는 드레인 관이다.In the figure, reference numeral 100 denotes a drain tube formed at the bottom of the rust preventing device main body 20.
이와같은 구성으로 이루어진 본 발명의 작용 및 효과를 설명하면 다음과 같다.Referring to the operation and effect of the present invention made of such a configuration as follows.
도 1 및 도 2에 도시한 바와같이, 이송 롤러를 통하여 이송되는 레일의 두부 표면에 열처리작업에 의해 내마모성이 우수한 미세 퍼얼라이트 조직의 생성후, 이를 야드에 적치시키기 전에 열처리된 레일(10)의 표면에 산화에 의한 부식발생을 방지시키기 위하여 방청유(40)를 도포할 경우에는, 이송롤러(미도시)를 통해 이송되는 열처리된 레일(10)이 방청장치 본체부(20)의 내부로 진입될 경우, 상기 방청장치 본체부(20)의 레일 진입부측에 설치된 감지센서(미도시)가 감지하여 전기적인 신호를 상기 방청장치 본체부(20)의 좌우 및 상하측에 각각 설치되는 분사노즐(30)에 전달하게 되며, 이에따라 상기 분사노즐(30)을 통해 상기 레일(10)의 표면에 일정량의 방청유(40)가 분사토록 되어, 상기 열처리된 레일(10) 표면에 방청유가 덮혀지도록 한다.As shown in Figs. 1 and 2, after the formation of the fine pearlite structure having excellent wear resistance by heat treatment on the head surface of the rail conveyed through the transfer roller, the heat treated rail 10 before being deposited in the yard. When the antirust oil 40 is applied to the surface to prevent corrosion due to oxidation, the heat-treated rail 10 transferred through a feed roller (not shown) may enter the inside of the rust preventive device body 20. In this case, the injection sensor 30 is installed on the left and right and upper and lower sides of the rust preventive device main body 20 by detecting a sensor (not shown) installed on the rail entry portion of the rust preventive device main body 20, respectively. ), And a predetermined amount of rust preventive oil 40 is sprayed on the surface of the rail 10 through the injection nozzle 30 so that the rust preventive oil is covered on the surface of the heat treated rail 10.
이때, 상기 레일(10) 표면에 생성되는 피막의 두께는 유량 조절밸브(50)에 의해 알맞게 조절할 수 있도록 한다.At this time, the thickness of the film generated on the surface of the rail 10 can be adjusted properly by the flow control valve (50).
상기 슬랙퀀칭 열처리작업을 거친 레일(10)은, 그 표면 온도가 약 100 - 200oC로 유지되는 상태에서, 상기 열처리된 레일(10) 표면에 분사노즐(30)을 통한 친수성의 방청유(40)를 분사시킬 경우, 상기 레일(10) 표면으로 분사되는 방청유(40)는 그 내부의 수분이 레일(10)의 가열된 온도에 의해 증기상태로 증발하고, 상기 열처리된 레일(10)의 표면에는 유막이 덮혀진채 고화되어, 상기 레일(10)을 야드에 적치시 산화에 의한 부식발생(녹)을 방지하게 된다.The rail 10 subjected to the slack quenching heat treatment is hydrophilic anti-rust oil 40 through the spray nozzle 30 on the surface of the heat-treated rail 10 while the surface temperature is maintained at about 100 to 200 ° C. In the case of spraying), the rust preventive oil 40 sprayed onto the surface of the rail 10 is evaporated in a vapor state by the heated temperature of the rail 10, the surface of the heat-treated rail 10 It is solidified while covered with an oil film to prevent corrosion (rust) due to oxidation when the rail 10 is immersed in the yard.
한편, 상기 열처리된 레일(10) 표면에 분사노즐(30)을 통해 분사되는 방청유(40)는, 상기 분사노즐(30)의 일단으로 연설되는 송유관(60)의 유량 조절밸브(50)에 의해 상기 분사노즐(30)의 방청유(40) 유량을 조절할 수 있도록 하며, 이때 상기 송유관(60)은 그 일단으로 방청유(40)을 공급하는 공급펌프 (70)를 개재하여 방청유 탱크(80)와 연통 연설토록 된다.On the other hand, the anti-rust oil 40 injected through the injection nozzle 30 on the surface of the heat-treated rail 10, by the flow rate control valve 50 of the oil supply pipe 60 is directed to one end of the injection nozzle (30) It is possible to adjust the flow rate of the rust preventive oil 40 of the injection nozzle 30, wherein the oil pipe 60 is in communication with the rust preventive oil tank 80 via a supply pump 70 for supplying the rust preventive oil 40 to one end thereof. It will be a speech.
따라서, 공급펌프(70)의 작동에 의해 상기 방청유 탱크(80) 내의 방청유(40)가 송유관(60)을 통해 분사노즐(30)로 공급토록 되며, 이때, 상기 방청유 탱크(80)와 연설되는 송유관(60)은, 상기 방청유 탱크(80)와 공급펌프(70) 사이에 필터(90)가 설치토록 됨으로써, 분사노즐(30)에 공급되는 방청유(40)의 이물질을 용이하게 제거할 수 있는 것이다.Therefore, the rust preventive oil 40 in the rust preventive oil tank 80 is supplied to the injection nozzle 30 through the oil supply pipe 60 by the operation of the supply pump 70, and at this time, the rust preventive oil tank 80 The oil supply pipe 60 is such that the filter 90 is installed between the rust preventive oil tank 80 and the supply pump 70, so that foreign matters of the rust preventive oil 40 supplied to the injection nozzle 30 can be easily removed. will be.
이상과 같이 본 발명에 따른 열처리 레일의 방청장치에 의하면, 열처리 작업의 완료후 이송되는 레일의 표면에 분사노즐을 통하여 방청유를 분사함으로써, 상기 열처리된 레일의 야드 적치시 레일 표면에 산화에 의해 발생되는 부식 발생을 미연에 예방함은 물론, 이에따라 열처리된 레일의 화학적 산화반응에 의한 기계적 성질의 저하를 방지하고, 상기 레일의 방청유 도포작업을 연속적으로 간편하게 수행할 수 있는 우수한 효과가 있다.As described above, according to the anti-rusting apparatus of the heat treatment rail according to the present invention, by spraying the rust-proof oil through the injection nozzle on the surface of the conveyed rail after completion of the heat treatment operation, generated by oxidation on the surface of the rail when the yards of the heat treated rail In addition to preventing the occurrence of corrosion in advance, thereby preventing the deterioration of the mechanical properties due to the chemical oxidation of the heat-treated rail, there is an excellent effect that can be easily and continuously perform the anti-rust oil coating operation of the rail.
본 발명은 특정한 실시예에 관련하여 도시하고 설명하였지만, 이하의 특허청구의 범위에 의해 마련되는 본 발명의 정신이나 분야를 벗어나지 않는 한도내에서 본 발명이 다양하게 개조 및 변화될수 있다는 것을 당업계에서 통상의 지식을 가진자는 용이하게 알수 있음을 밝혀두고자 한다.While the invention has been shown and described with respect to specific embodiments thereof, it will be appreciated that various changes and modifications can be made in the art without departing from the spirit or scope of the invention as set forth in the following claims. Those of ordinary skill will want to know easily.
Claims (3)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020000004596A KR100339894B1 (en) | 2000-01-31 | 2000-01-31 | Anticorrsion apparatus for heat treated rails |
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| KR1020000004596A KR100339894B1 (en) | 2000-01-31 | 2000-01-31 | Anticorrsion apparatus for heat treated rails |
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| KR100339894B1 true KR100339894B1 (en) | 2002-06-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101867723B1 (en) * | 2016-12-19 | 2018-06-14 | 주식회사 포스코 | Apparatus for corrosion test |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63114923A (en) * | 1986-11-04 | 1988-05-19 | Nippon Steel Corp | Non-deformation cooling method for high temperature rail |
| JPH06299246A (en) * | 1993-04-12 | 1994-10-25 | Nippon Steel Corp | Heat treatment method for rail |
| KR19990038774U (en) * | 1998-03-31 | 1999-10-25 | 이구택 | Anti-corrosion oil coating device on both sides of coil |
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2000
- 2000-01-31 KR KR1020000004596A patent/KR100339894B1/en active IP Right Grant
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63114923A (en) * | 1986-11-04 | 1988-05-19 | Nippon Steel Corp | Non-deformation cooling method for high temperature rail |
| JPH06299246A (en) * | 1993-04-12 | 1994-10-25 | Nippon Steel Corp | Heat treatment method for rail |
| KR19990038774U (en) * | 1998-03-31 | 1999-10-25 | 이구택 | Anti-corrosion oil coating device on both sides of coil |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101867723B1 (en) * | 2016-12-19 | 2018-06-14 | 주식회사 포스코 | Apparatus for corrosion test |
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| KR20010077054A (en) | 2001-08-17 |
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