KR20040055999A - Method for preventing corrosion of steel strip by controling the ringer roll position - Google Patents

Method for preventing corrosion of steel strip by controling the ringer roll position Download PDF

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KR20040055999A
KR20040055999A KR1020020082501A KR20020082501A KR20040055999A KR 20040055999 A KR20040055999 A KR 20040055999A KR 1020020082501 A KR1020020082501 A KR 1020020082501A KR 20020082501 A KR20020082501 A KR 20020082501A KR 20040055999 A KR20040055999 A KR 20040055999A
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section
steel sheet
washing
ringer roll
ringer
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KR1020020082501A
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Korean (ko)
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KR100928981B1 (en
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성진경
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주식회사 포스코
재단법인 포항산업과학연구원
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    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23GCLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G3/00Apparatus for cleaning or pickling metallic material
    • C23G3/02Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
    • C23G3/027Associated apparatus, e.g. for pretreating or after-treating
    • C23G3/029Associated apparatus, e.g. for pretreating or after-treating for removing the pickling fluid from the objects
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04Cleaning involving contact with liquid
    • B08B3/041Cleaning travelling work

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

PURPOSE: A method for preventing corrosion of hot rolled strip in rinsing zone by adjusting position of ringer rolls is provided to prevent corrosion phenomena generated on a lower part of the strip by adjusting an angle between rear ringer roll of pickling section and rinsing ringer roll of first section, thereby adjusting angle of the strip. CONSTITUTION: In a method for preventing corrosion on a lower part of strip generated while the strip is being rinsed in rinsing section after pickling a hot rolled strip in pickling section, the method comprises the process of inducing flow of rinsing solution generated in a lower part of the strip of first rinsing section(14) by lowering an installation height of ringer roll(8) of first section of the rinsing section(3), thereby giving a downward inclination to a proceeding angle(13) of the strip passing through the ringer roll of the first section after passing through rear ringer roll(5) of the pickling section, wherein the proceeding angle of the strip passing through the rear ringer roll and the ringer roll of the first section formed by lowering the installation height of the ringer roll of the first section is 5 to 30 degrees.

Description

링거롤 위치조절에 의한 수세구역의 열연강판 부식 방지방법{METHOD FOR PREVENTING CORROSION OF STEEL STRIP BY CONTROLING THE RINGER ROLL POSITION}Method for Preventing Hot-Rolled Steel Sheet Corrosion in the Washing Area by Adjusting the Position of Ringer Roll {METHOD FOR PREVENTING CORROSION OF STEEL STRIP BY CONTROLING THE RINGER ROLL POSITION}

본 발명은 링거롤 위치조절에 의한 수세구역의 열연강판 부식 방지방법에 관한 것으로서, 보다 상세하게는 제철소에서 열연강판의 산세를 실시한 다음, 수세를 실시할 때 발생하는 강판부식을 링거롤의 설치각도를 제어하여 방지하는 링거롤 위치조절에 의한 수세구역의 열연강판 부식 방지방법에 관한 것이다.The present invention relates to a method for preventing corrosion of a hot rolled steel sheet in a water washing zone by adjusting the position of a ringer roll, and more particularly, after the pickling of a hot rolled steel sheet in a steel mill, the corrosion of the steel sheet generated when the water is washed, The present invention relates to a method for preventing corrosion of a hot rolled steel sheet in a flush area by adjusting a ringer roll position to prevent the control.

제철소 산세공장에는 산세공정과 코일링 공정 사이에는 수세공정이 있는데, 이를 통상 린싱 라인(Rinsing Line)이라 부르고 있으며, 이러한 린싱 공정의 역할은 산세 후 강판에 잔류하는 산세용액(통상 약 80℃의 18%염산용액)을 제거하기 위함이다.The steel pickling plant has a washing process between the pickling process and the coiling process, which is commonly referred to as a rinsing line. The role of this rinsing process is to pickle liquor that remains on the steel plate after pickling (usually around 80 ℃). % Hydrochloric acid solution) to remove.

제철소에서 일반적으로 사용되는 수세 구간의 형상은, 도 1에 도시된 바와 같이, 강판(1)이 산세구간(2)에서 나오자마자 연결통로(6)를 통하여 수세구간(3)으로 이동하며, 이때 수세구간(3)으로의 과다한 산의 유입을 억제하기 위하여 전후단으로 설치된 더블 링거링 롤(Ringer Roll; 4, 5)을 거쳐서 강판 표면을 짜주게 된다.The shape of the washing section generally used in steel mills, as shown in Figure 1, as soon as the steel sheet 1 exits the pickling section (2) is moved to the washing section (3) through the connecting passage (6), where In order to suppress the excessive inflow of acid into the washing section 3, the surface of the steel sheet is squeezed through a double ringer roll (4, 5) installed in the front and rear ends.

이렇게 수세구간(3)으로 유입된 열연강판(1)에는 다수 개소에 설치된 수세노즐(7, 9)을 통하여 강판의 상하부에서 다량의 물이 분사되어 산세로 산화 피막이 제거된 강판을 수세하게 된다.The hot rolled steel sheet 1 introduced into the water washing section 3 is sprayed with a large amount of water from the upper and lower parts of the steel sheet through the water washing nozzles 7 and 9 installed at a plurality of places, thereby washing the steel sheet from which the oxide film is removed by pickling.

이 수세공정은 3~5단계로 나누어진 구간에서 실시되며(도 1의 경우에는 4단계), 각 구간에는 1~4개의 수세노즐(7,9)이 강판 상하에 배치되어 약 60℃의 고압의 물로 수세를 실시하게 된다.This washing process is carried out in a section divided into 3 to 5 steps (4 steps in the case of FIG. 1), and in each section, 1 to 4 flush nozzles (7, 9) are disposed above and below the steel plate to obtain a high pressure of about 60 ° C. Water will be washed.

이 때 수세구간(3)이 나누어지는 이유는 수세의 효율을 높이기 위한 것으로, 도 1에 도시된 바와 같이, 열연강판(1)이 수세구간(3)을 벗어나는 마지막 구간에서 중성의 물이 강판의 표면에 뿌려지며 이 물을 모아서 그 전 단계의 구간에서 수세를 실시하며, 이와 같은 방법으로 수세는 실시된다.At this time, the reason why the washing section 3 is divided is to increase the efficiency of washing, as shown in Figure 1, in the last section of the hot-rolled steel sheet 1 is outside the washing section (3) neutral water is It is sprayed on the surface and the water is collected and washed in the previous stage. In this way, the washing is carried out.

따라서 도 1의 경우와 같은 수세시스템에서는 제1구간 수조(14)에서 가장 낮은 수소이온농도를 나타내게 된다.Therefore, in the water washing system as in the case of FIG. 1, the lowest concentration of hydrogen ions in the water tank 14 of the first section is shown.

이러한 수세방법은 매우 효율적이어서 일반 수세 정에서는 표면이 미려한 강판을 얻을 수 있다.Such a washing method is very efficient, and in general washing, a steel sheet having a beautiful surface can be obtained.

그러나 제철소의 열연라인이 항상 정상가동 되지는 않으며, 기계적인 이유 혹은 그 외의 비정상적인 상황이 발생하면 모든 라인이 정지하거나 서행하는 경우가 있다.However, the hot-rolled lines of steel mills are not always operating normally, and in case of mechanical reasons or other abnormal situation, all lines may stop or slow down.

즉, 열연라인을 통과하는 강판의 속도는 평소 110∼135mpm (통과시간 약 8초) 정도이나 예외적인 경우에는 약 10mpm (통과시간 약 100초) 정도 혹은 그 이하가 되며, 이때 다량의 부식이 발생하게 된다.That is, the speed of the steel sheet passing through the hot rolled line is usually about 110 to 135mpm (passing time about 8 seconds), but in exceptional cases, about 10mpm (passing time about 100 seconds) or less, in which case a large amount of corrosion occurs. Done.

부식이 발생하는 이유는 수세용액이 이미 수세공정을 통해 많이 산성화되어 있기 때문이며, 이 용액에 단기간 노출하게 되면 표면의 백색도 등에 영향을 미치는 부식에 크게 영향을 받지 않아 육안으로 식별할 수 없지만, 노출시간이 길어지면 그 영향이 가시적으로 나타나기 때문이다.Corrosion occurs because the washing solution is already highly acidified through the washing process, and if it is exposed to this solution for a short time, it cannot be identified with the naked eye because it is not greatly affected by the corrosion that affects the whiteness of the surface. This is because the effect is visible when it is longer.

도 1의 제1~3구간(14, 15, 16)의 수세용액은 pH 값이 1.5~3정도로 산성을 띄게 되며, 이러한 pH 구간에서는 아래와 같은 반응이 일어나며 강판의 표면에 부식이 발생한다.The washing solution of the first to third sections 14, 15, and 16 of FIG. 1 has an acidic pH value of about 1.5 to about 3, and in such a pH section, the following reaction occurs and corrosion occurs on the surface of the steel sheet.

Fe + 2H+→ Fe+2+ H2 Fe + 2H + → Fe +2 + H 2

Fe+2+ 4OH-→ 2Fe(OH)2 Fe +2 + 4OH - → 2Fe ( OH) 2

2Fe(OH)2+ H2O + 1/2O2→ 2Fe(OH)3(부식)2Fe (OH) 2 + H 2 O + 1 / 2O 2 → 2Fe (OH) 3 (corrosion)

특히 라인이 정지 혹은 서행할 때는, 도 2에 도시된 바와 같이, 제1구간(14) 후방부, 즉 제1구간 수세노즐(7)의 마지막 노즐과 제1구간 수세 링거링 롤(8) 사이구간의 강판하부에서 부식이 매우 심각하게 발생한다.In particular, when the line stops or slows down, as shown in FIG. 2, between the rear end of the first section 14, that is, between the last nozzle of the first section flush nozzle 7 and the first section flush ringer roll 8. Corrosion is very serious in the lower section of the section.

도 3은 상기한 제1구간(14) 후방부에서 발생한 강판의 부식현상을 보여주고 있다.3 shows the corrosion phenomenon of the steel sheet generated in the rear portion of the first section (14).

도 3의 특이한 점은 물분사가 된 지역과 문제의 지역 사이에는 부식 정도가 현격한 차이가 있다는 점이다. 즉 이 구간에 있는 강판의 하부에서 부식이 발생하는 원인은 비록 제1구간 수세노즐(7)을 통하여 수세를 실시하였으나, 강판 하부는 충분히 세정되지 않아서 염산이 매우 높은 농도로 강판 표면에 잔류하기 때문이다.The peculiarity of FIG. 3 is that there is a marked difference in the degree of corrosion between the water sprayed area and the problem area. That is, the cause of corrosion in the lower part of the steel sheet in this section, although the water washing was carried out through the water washing nozzle (7) in the first section, because the lower part of the steel sheet is not sufficiently cleaned, hydrochloric acid remains on the surface of the steel sheet at a very high concentration to be.

상부의 경우에는 분사된 물이 표면에서 충돌 후 고여서 흐르게 되며 이 용액이 강판에 잔류한 산용액을 희석시키는 작용을 하므로 부식 문제가 심각하지 않다.In the case of the upper part, the sprayed water flows after colliding at the surface, and this solution acts to dilute the acid solution remaining on the steel sheet, so the corrosion problem is not serious.

그러나 하부의 경우에는 노즐을 통하여 분사된 수세액이 강판에 강하게 충돌한 후에 수조로 떨어져 버리기 때문에 수세효과란 노즐스프레이 뿐이라 할 수 있다.However, in the case of the lower part, since the flushing liquid sprayed through the nozzles collides strongly with the steel sheet and falls off into the tank, the flushing effect may be referred to as a nozzle spray only.

이에 따라 강판 하부에는 잔류 염산 농도가 높은 구간이 되며, 제1구간 수세 링거링 롤(8)에 의해 수분이 제거되어도 여전히 높은 염산농도를 갖고 있으며, 이 상태가 제2구간(15)의 첫 번째 수세지역까지 유지되게 되므로 서행 내지는 정지 시에는 이 부위에서 강판 하부 녹 발생은 매우 심각하다.Accordingly, the lower portion of the steel sheet becomes a high residual hydrochloric acid concentration, and even though water is removed by the water washing ringer roll 8 in the first section, the hydrochloric acid concentration is still high, and this state is the first in the second section 15. Since it is maintained up to the washing area, the rust generation of the lower part of the steel sheet is very serious at the time of slowing or stopping.

이러한 문제가 발생한 원인은 강판의 진행이 지표면에 평행하기 때문인데, 이에 따라 강판 하부에서는 수세액의 흐름이 없어 수세액의 잔류염산농도 희석 효과가 미미하기 때문이며, 강판의 일부분에서 발생하는 이러한 부식이 중요한 결함으로 인식되는 이유는 이로 인해 코일 전체의 가치가 하락하기 때문이다.This problem occurs because the progress of the steel plate is parallel to the surface of the steel plate. Therefore, there is no flow of washing liquid in the lower part of the steel sheet, so the effect of diluting the residual hydrochloric acid concentration of the washing liquid is insignificant. It is recognized as a significant defect because it reduces the value of the entire coil.

상기한 문제점을 해결하기 위하여, 본 발명은 제철소 산세구간에서 라인이 저속운행 혹은 정지했을 때 산세구간의 후단 링거롤과 제1구간 수세 링거롤 사이의 각도를 조절하여 강판의 각도를 조절함으로써 제1구간 후방부에 위치한 강판 하부에서 발생하는 부식현상을 방지할 수 있는 링거롤 위치조절에 의한 수세구역의 열연강판 부식 방지방법을 제공하는데 그 목적이 있다.In order to solve the above problems, the present invention, by adjusting the angle of the steel sheet by adjusting the angle between the rear ringer roll and the first section of the washing ringer roll in the pickling section when the line is running at low speed or stopped in the steel mill pickling section It is an object of the present invention to provide a method for preventing corrosion of hot rolled steel sheet in a washing area by adjusting the position of a ringer roll, which can prevent corrosion occurring in a lower part of a steel plate located at a rear portion of a section.

도 1은 제철소 열연라인의 산세공정과 수세공정의 구간모식도;1 is a schematic view of the section of the pickling process and washing process of the steel mill hot rolling line;

도 2는 제철소 열연라인의 수세구간의 모식도;Figure 2 is a schematic view of the flush section of the steel mill hot-rolled line;

도 3은 종래의 열연라인 수세구간에서 강판에 발생하는 부식상태를 도시한 사진도;3 is a photograph showing a corrosion state occurring in the steel sheet in the conventional hot-rolled line washing section;

도 4는 본 발명에 따른 링거롤 위치조절에 의한 수세구역의 열연강판 부식 방지방법을 도시한 모식도이다.Figure 4 is a schematic diagram showing a method for preventing corrosion of the hot rolled steel sheet in the water washing zone by adjusting the position of the ringer roll according to the present invention.

♣도면의 주요부분에 대한 부호의 설명♣♣ Explanation of symbols for main part of drawing ♣

1:열연강판 2:산세구간 3:수세구간 4:전단 더블링거링 롤1: hot rolled steel sheet 2: pickling section 3: flush section 4: shear double ringer roll

5:후단 더블링거링 롤 6:산세-수세 연결통로5: Back end doubling ring 6: Pickling-washing passage

7:제1구간 수세노즐 헤더 8:제1구간 수세 링거링 롤7: Section 1 flush nozzle No. 8: Section 1 flush ringer roll

9:제2구간 수세노즐 헤더 10:녹발생 방지시스템9: second section flush nozzle header 10: rust prevention system

11:제1구간 수세용액 수조 12:제2구간 수세 링거링 롤11: Section 1 flush solution bath 12: Section 2 flush ringer roll

13:강판진행각도13: Steel plate progress angle

상기한 목적을 달성하기 위하여, 본 발명을 열연 강판을 산세구간에서 산세를 실시한 다음, 수세구간에서 수세하는 도중에 발생하는 강판의 하부부식을 방지하는 방법에 있어서, 상기 수세구간의 제1구간 링거링 롤의 설치높이를 낮추어서, 상기 산세구간의 후단 링거롤을 통과하여 제1구간 링거링 롤을 통과하는 강판의 진행각도를 하향 경사를 줌으로써 제1수세구간의 강판 하부에 발생하는 수세용액의흐름을 유도하는 것을 특징으로 하는 링거롤 위치조절에 의한 수세구역의 열연강판 부식 방지방법을 제공한다.In order to achieve the above object, according to the present invention, in the method for preventing the lower corrosion of the steel sheet generated during the washing in the pickling section of the hot-rolled steel sheet in the washing section, the first section ringer ring in the washing section By lowering the installation height of the roll, the flow rate of the flushing solution generated in the lower portion of the steel sheet of the first washing section by inclining the downward angle of the steel sheet passing through the rear ringer roll passing through the pickling section and passing through the first section ringer ring It provides a method for preventing corrosion of hot rolled steel sheet in the water washing zone by adjusting the position of the ringer roll.

또한, 본 발명은 상기 제1구간 링거링 롤의 설치높이를 낮추어 형성되는 상기 후단 링거롤과 제1구간 링거링 롤을 통과하는 강판 진행각도가 5~30도인 것을 특징으로 하는 링거롤 위치조절에 의한 수세구역의 열연강판 부식 방지방법을 제공한다.In addition, the present invention is the ringer roll position adjustment, characterized in that the steel sheet passing angle passing through the rear end ringer roll and the first section ringer ring roll formed by lowering the installation height of the first section ringer ring roll is 5 ~ 30 degrees. To prevent corrosion of hot-rolled steel sheet in the washing area.

이하, 본 발명의 구성을 상세하게 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, the structure of this invention is demonstrated in detail.

도 4는 본 발명에 따른 링거롤 위치조절에 의한 수세구역의 열연강판 부식 방지방법을 도시한 모식도이다.Figure 4 is a schematic diagram showing a method for preventing corrosion of the hot rolled steel sheet in the water washing zone by adjusting the position of the ringer roll according to the present invention.

본 발명은 수세구간 강판하부에서 발생하는 부식이 제1구간(14) 후방부 및 제2구간(15) 전방부에서 발생하며, 그 원인이 강판하부에서는 수세용액의 원활한 흐름이 없기 때문이라는 점에 착안하여, 도 4에 도시된 바와 같이, 제1구간(14)의 수세 링거링 롤(8)의 높이를 낮추어서 강판 진행에 일정각도의 경사를 주어 제1수세구간(14) 및 제2수세구간(15)의 강판 하부에서 수세용액의 흐름을 유도하여 강판 표면의 산농도가 낮춰 녹이 발생하는 것을 방지하는 것을 특징으로 한다.According to the present invention, the corrosion occurring in the lower part of the steel plate is generated in the rear part of the first section 14 and the front of the second section 15, and the reason is that there is no smooth flow of the washing solution in the lower part of the steel sheet. 4, the height of the flush ringer roll 8 of the first section 14 is lowered to give an angle of inclination to the steel sheet to advance the first flush section 14 and the second flush section. Inducing the flow of the flushing solution in the lower part of the steel sheet (15) is characterized in that the acid concentration on the surface of the steel sheet is lowered to prevent the occurrence of rust.

즉, 제1구간 수세 링거링 롤 (8)의 높이를 산세구간(2)의 더블 링거링 롤(4, 5) 및 제2구간 수세 링거링 롤(12) 보다 낮추게 되면 강판이 진행할 때 그 높이가 제1구간 수세 링거링 롤 (8)에서 더블 링거링 롤(4, 5)과 제2구간 수세 링거링 롤(12)에 비해 상대적으로 낮아지게 된다.That is, if the height of the first section flush ringer roll 8 is lower than the double ringer rolls 4 and 5 and the second section flush ringer roll 12 of the pickling section 2, the height of the steel sheet proceeds. Is relatively lower in the first section flush ringer roll 8 than the double ringer rolls 4 and 5 and the second section flush ringer roll 12.

그 결과 높이 차이가 없던 때와는 달리 제1구간 수세 링거링 롤(8) 방향으로경사가 지게 되고, 따라서 제1 및 2구간(14, 15) 하부에 분사된 물은 강판(1)을 따라 제1구간 수세 링거링 롤(8) 방향으로 흐르게 되고, 그 결과 잔류 산농도 희석 효과가 생겨서 부식이 방지되게 된다.As a result, unlike when there is no difference in height, there is an inclination in the direction of the flush ringer roll 8 in the first section, so that the water sprayed below the first and second sections 14 and 15 flows along the steel sheet 1. It flows in the direction of the 1st section flush ringer roll 8, As a result, a residual acid concentration dilution effect arises and corrosion is prevented.

이하, 바람직한 실시예를 통하여 본 발명의 작용을 설명한다.Hereinafter, the operation of the present invention through the preferred embodiment.

[실시예 1]Example 1

하기 표 1은 정지시 강판이 진행하는 각도에 따른 제1수세구간 후방부(제1구간 마직막 수세노즐에서 제2구간 첫번째 노즐 사이)에 위치한 강판의 부식발생정도를 보여주고 있으며, 테스트 후 부식발생 방지력은 황색도의 측정을 이용하였으며 ASTM E313-1973에 준하여 측정하였다.Table 1 shows the occurrence of corrosion of the steel sheet located in the rear portion of the first flush section (between the first nozzle of the second section in the last flush nozzle of the first section) according to the angle of the steel sheet during the stop, the corrosion after the test The protective force was measured by measuring the yellowness and measured according to ASTM E313-1973.

실험 결과 3도 이하로 경사를 준 경우에는 강판진행각도가 크지 않아서 그 효과가 미미하였다.As a result of the experiment, when the steel plate was inclined to 3 degrees or less, the steel plate progress angle was not large, and the effect was insignificant.

그러나 강판진행각도가 5~10도를 넘어가며 경사에 따른 물의 흐름이 유도되어 양호한 결과를 보여주었고, 10도 이상의 경사가 유지된 상태에서는 흐름이 원활하여 노즐분사지역과 동등한 정도의 부식특성을 보여주었다.However, the steel plate progress angle exceeded 5 ~ 10 degrees and the water flow was induced according to the inclination, and showed good results.In the state where the inclination of 10 degrees or more was maintained, the flow was smooth, showing the same corrosion characteristics as the nozzle injection zone. gave.

한편 강판진행의 경사는 30도 이상은 바람직하지 않은데, 그 원인은 강판이 두껍기 때문에 과도한 경사는 강판이 수평으로 복원되려는 성향 때문에 상부 링거링 롤에 과도한 응력을 유발 시켜 그 수명을 짧게 하기 때문이다.On the other hand, the inclination of the steel sheet progress is not preferable because the steel sheet is thick, because the excessive inclination causes excessive stress on the upper ringer ring due to the tendency of the steel plate to restore horizontally, shortening its life.

[실시예 2]Example 2

하기 표 2 는 서행시 강판이 진행하는 각도에 따른 강판의 녹발생 변화를 보여주고 있으며, 테스트 후 녹발생 방지력은 황색도의 측정을 이용하였으며 ASTM E313-1973에 준하여 측정하였다.Table 2 below shows the change in the rust generation of the steel sheet according to the progress of the steel sheet during the slow motion, the rust generation after the test was used to measure the yellowness was measured according to ASTM E313-1973.

실험 결과 서행 속도에 따라서 제1구간 수세 링거링 롤(8) 높이 변화가 다르게 나타났다.As a result of the experiment, the height change of the flush ring ring 8 in the first section was different depending on the slow speed.

즉, 라인속도가 낮을수록 제1구간 수세 링거링 롤 (8) 높이변화가 부식발생 방지에 미치는 영향이 큰 것으로 나타났다.That is, the lower the line speed, the greater the influence of the height change of the flush ringer roll 8 on the first section on the prevention of corrosion.

그러나, 30m/min의 속도에서는 그 효과가 상대적으로 적음을 알 수 있으며, 라인이 정지를 했을 경우와 유사한 결과가 서행에서도 발견되었는데, 강판의 경사각도를 3도 이하로 경사를 준 경우에는 경사가 크지 않아서 경상에 따른 물의 흐름 효과가 미미하였다.However, at a speed of 30 m / min, the effect is relatively small, and similar results to those when the line is stopped are found in the slow motion. When the inclination angle of the steel sheet is inclined below 3 degrees, the slope is As it was not large, the flow effect of water was insignificant.

그러나 5~10도를 넘어가며 경사에 따른 물의 흐름이 유도되어 양호한 결과를 보여주었고 10도 이상의 경사가 유지된 상태에서는 흐름이 원활하여 우수한 녹 발생 방지 특성을 보여주었다.However, over 5 ~ 10 degrees, the flow of water was induced according to the inclination, and showed good results.

한편 강판 진행의 경사는 30도 이상은 바람직하지 않은데 그 원인은 강판이 두껍기 때문에 과도한 경사는 강판이 수평으로 복원되려는 성향 때문에 상부 링거링 롤에 과도한 응력을 유발 시켜 그 수명을 짧게 하기 때문이다.On the other hand, the inclination of the steel sheet advance is not preferable because the steel sheet is thick, because the excessive inclination causes excessive stress on the upper ringer ring due to the tendency of the steel plate to restore horizontally, shortening its life.

상술한 바와 같이, 본 발명은 열연강판의 산세를 실시한 다음, 수세를 실시할 때 발생하는 강판하부의 수세용액을 링거롤의 설치각도를 제어하여 원활히 유도함으로써 저비용으로 강판의 하부부식을 방지하여 제조되는 강판 코일제품의 표면품질을 현저히 증가시키는 효과가 있다.As described above, the present invention is produced by preventing the lower corrosion of the steel sheet at low cost by smoothly induction of the washing solution of the lower steel sheet generated by the pickling of the hot-rolled steel sheet, followed by washing by controlling the installation angle of the ringer roll There is an effect of significantly increasing the surface quality of the steel sheet coil product.

Claims (2)

열연된 강판(1)을 산세구간(2)에서 산세를 실시한 다음, 수세구간(3)에서 수세하는 도중에 발생하는 강판(1)의 하부부식을 방지하는 방법에 있어서,In the method of preventing the lower corrosion of the steel sheet 1 generated during the washing of the hot-rolled steel sheet (1) in the pickling section (2), and washing in the washing section (3), 상기 수세구간(3)의 제1구간 링거링 롤(8)의 설치높이를 낮추어서, 상기 산세구간(2)의 후단 링거롤(5)을 통과하여 제1구간 링거링 롤(8)을 통과하는 강판(1)의 진행각도를 하향 경사를 줌으로써 제1수세구간(14)의 강판(1) 하부에 발생하는 수세용액의 흐름을 유도하는 것을 특징으로 하는 링거롤 위치조절에 의한 수세구역의 열연강판 부식 방지방법.Lowering the installation height of the first section ringer ring (8) of the washing section (3), passing through the rear end ringer roll (5) of the pickling section (2) to pass through the first section ringer ring (8) Hot-rolled steel sheet of the washing zone by adjusting the position of the ringer roll, characterized by inducing the flow of the washing solution generated in the lower portion of the steel sheet 1 of the first washing section 14 by inclining the traveling angle of the steel sheet 1 downward. How to prevent corrosion. 제1항에 있어서,The method of claim 1, 상기 제1구간 링거링 롤(8)의 설치높이를 낮추어 형성되는 상기 후단 링거롤(5)과 제1구간 링거링 롤(8)을 통과하는 강판(1) 진행각도는 5~30도인 것을 특징으로 하는 링거롤 위치조절에 의한 수세구역의 열연강판 부식 방지방법.The traveling angle of the steel sheet 1 passing through the rear end ringer roll 5 and the first section ringering roll 8 formed by lowering the installation height of the first section ringering roll 8 is 5 to 30 degrees. Method for preventing corrosion of hot rolled steel sheet in water washing zone by adjusting ringer roll position.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10704151B2 (en) 2015-12-18 2020-07-07 Posco Pickling apparatus and pickling method
KR102175591B1 (en) * 2019-07-17 2020-11-06 주식회사 포스코 Rinsing apparatus and method of rinsing using the same

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JPS62203268U (en) 1986-06-13 1987-12-25
KR940007177B1 (en) * 1992-06-03 1994-08-08 포항종합제철 주식회사 Method of removing impurities of galvanized sheets and apparatus therefor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10704151B2 (en) 2015-12-18 2020-07-07 Posco Pickling apparatus and pickling method
KR102175591B1 (en) * 2019-07-17 2020-11-06 주식회사 포스코 Rinsing apparatus and method of rinsing using the same

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