KR100328086B1 - Hot rolling method to prevent the wear defect of down coller side guide wear plate for stainless steel - Google Patents
Hot rolling method to prevent the wear defect of down coller side guide wear plate for stainless steelInfo
- Publication number
- KR100328086B1 KR100328086B1 KR1019970073570A KR19970073570A KR100328086B1 KR 100328086 B1 KR100328086 B1 KR 100328086B1 KR 1019970073570 A KR1019970073570 A KR 1019970073570A KR 19970073570 A KR19970073570 A KR 19970073570A KR 100328086 B1 KR100328086 B1 KR 100328086B1
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- Prior art keywords
- hot rolling
- side guide
- stainless
- hot
- graphite
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005098 hot rolling Methods 0.000 title claims abstract description 17
- 230000007547 defect Effects 0.000 title abstract description 9
- 239000010935 stainless steel Substances 0.000 title abstract description 7
- 229910001220 stainless steel Inorganic materials 0.000 title abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 28
- 239000010439 graphite Substances 0.000 claims abstract description 28
- 239000007864 aqueous solution Substances 0.000 claims abstract description 21
- 238000004804 winding Methods 0.000 claims description 4
- 239000000243 solution Substances 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 230000001050 lubricating effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000035899 viability Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0239—Lubricating
- B21B45/0245—Lubricating devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0057—Coiling the rolled product
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
Description
본 발명은 스테인레스 열연코일의 권취시 열연코일과 인도판넬(Down coiler sideguide wear plate)의 마찰에 의해 열연코일의 엣지부에 생기는 마찰흠을 방지하기 위해 방법에 관한 것이다. 보다 상세하게는 인도판넬과 열연코일사이에 그라파이트 수용액을 분출하여 마찰흠을 효과적으로 방지함으로서 우수한 표면품질의 스테인레스 열연코일을 제조하기 위해 방법에 관한 것이다.The present invention relates to a method for preventing frictional flaw generated at the edge of the hot rolled coil by the friction of the hot rolled coil and the down coiler sideguide wear plate when the stainless hot rolled coil is wound. More specifically, the present invention relates to a method for producing a stainless hot rolled coil having excellent surface quality by spraying an aqueous graphite solution between an induction panel and a hot rolled coil to effectively prevent friction scratches.
일반적으로 제철소의 열간압연 공정에서는 도 1(a)에 도시된 것처럼, 열간압연된 열연코일(1)을 권취기(Down coller)(2)로 안내하여 진입시키는 인도판넬(Down coiler side guide wear plate)(3)이 설치되어 있다. 이 인도판넬(3)은 열연코일(1)을 인도하기 위해 코일양측을 조여주게 된다. 따라서, 인도판넬은 빠른속도로 진행하는 열연코일과의 충격과 함께 심한 마모를 일으켜 표면은 심하게 거칠어지게 된다.In general, in the hot rolling process of a steel mill, a guide coil (Down coiler side guide wear plate) guides and enters the hot rolled hot rolled
특히, 강도가 높은 고탄소강을 권취할 때, 표면이 더욱 심하게 거칠어진다. 이후 강도가 낮은 스테인레스강이 권취될 때는 거칠어진 인도판넬의 표면에 의해 오히려 스테인레스 열연코일의 엣지부에 심한 상처를 입히게 되어 표면품질저하를 일으키는 문제가 있다.In particular, when winding high-strength high carbon steel, the surface becomes more rough. Since when the low strength stainless steel is wound, the surface of the rough guided panel is rather severely injured at the edge of the stainless hot rolled coil, causing a problem of surface quality deterioration.
또한, 현재 사용하고 있는 인넬판넬이 SS400의 일반강으로 제조되는데, 이 재료는 마모가 심해 약 6일내지 7일내에 새로운 것으로 교체해 주어야 하므로 원가상승의 요인이 되고 있다. 따라서, 이러한 마찰흠을 방지할 목적으로 스테인레스를 생산하는 열간압연공정에서는 인도판넬의 재질개선 및 새로운 형태의 인도판넬을 적용하는 등의 많은 노력이 이루어지고 있다. 하지만, 인도판넬의 재질개선에 의해 효과를 얻으려면 기존 값싼 일반강(SS400)에 비해 과도하게 비싼 재료를 사용해야 하며, 또한 새로운 형태의 인도판넬을 적용시 설비도입의 큰 원가상승요인이 발생하게 되어 적극적인 방법이 아니라고 판단된다.In addition, the panel currently used is made of SS400 steel, which is a factor of cost increase because the material has to be replaced with a new one within about 6 to 7 days. Therefore, in the hot rolling process for producing stainless steel for the purpose of preventing such friction scratches, many efforts have been made, such as improving the material of the delivery panel and applying a new type of delivery panel. However, in order to take advantage of the improvement of the material of the delivery panel, it is necessary to use materials that are excessively expensive compared to the existing cheap steel (SS400), and when the new type of delivery panel is applied, a large cost increase factor of equipment introduction occurs. I don't think it's a positive way.
본 발명은 표면결함이 없는 우수한 표면품질이 스테인레스 열연코일을 제조하기 위한 열간압연 방법을 제공하는데, 그 목적이 있다.An object of the present invention is to provide a hot rolling method for producing a stainless hot rolled coil having excellent surface quality without surface defects.
도 1은 기존 열간압연방법의 개략도로서,1 is a schematic diagram of a conventional hot rolling method,
도 1(a)는 공정도이고,1 (a) is a process diagram,
도 1(b)는 기존공정에 사용되는 인도판넬을 나타내는 모식도이다;Figure 1 (b) is a schematic diagram showing the delivery panel used in the existing process;
도 2는 본 발명에 따른 열간압연방법의 개략도로서,2 is a schematic view of a hot rolling method according to the present invention,
도 2(a)는 공정도이고,2 (a) is a process diagram,
도 2(b)는 본 발명의 인도판넬을 나타내는 모식도이다;Figure 2 (b) is a schematic diagram showing the delivery panel of the present invention;
도 3은 기존방법 및 본 발명에 따라 조업한 인도판넬의 마모형상을 나타내는 모식도이다.Figure 3 is a schematic diagram showing the wear shape of the delivery panel operated in accordance with the existing method and the present invention.
* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings
1... 열연코일(hot bar) 2.. 권취기1 ... hot rolled coil (hot bar) 2 .. winder
3... 인도판넬(Down coiler side guide wear plate)3 ... Down coiler side guide wear plate
상기 목적을 달성하기 위한 본 발명은, 스테인레스 열연코일을 권취기로 인도하여 진입시키는 인도판넬을 포함한 열간압연장치를 이용하여 열간압연하는 방법에 있어서, 상기 스테인레스 열연코일의 엣지부가 접촉하는 인도판넬의 부위에 150-200mm의 곡률을 갖는 홈부를 형성하고, 이 홈부에 다수개의 분출구를 형성하는 단계; 및In order to achieve the above object, the present invention provides a method of hot rolling using a hot rolling apparatus including a guide panel for guiding a stainless hot rolled coil into a winding machine, wherein the edge portion of the stainless hot rolled coil contacts the edge part of the stainless hot rolled coil. Forming a groove having a curvature of 150-200 mm in the groove, and forming a plurality of jet holes in the groove; And
그라파이트를 30-40부피%로 함유하는 수용액을 상기 분출구를 통해서 5-15kgf/㎟의 압력 및 유량으로 주입하여 열연코일을 권취하는 단계;를 포함하여 이루어진다.Injecting an aqueous solution containing graphite at 30-40% by volume at a pressure and a flow rate of 5-15kgf /
이하, 본 발명을 도면을 통하여 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the drawings.
본 발명은 열연코일이 진입시 인도판넬과 열연코일 엣지부사이에 그라파이트수용액을 분출하여 열연코일 인도판넬과 열연코일의 표면 사이에 그라파이트 입자가 윤활작용을 하여 마찰흠을 효과적으로 방지하는데, 그 특징이 있다.The present invention is characterized in that the graphite particles are lubricated between the surface of the hot rolled coil guide panel and the hot rolled coil by spraying the graphite aqueous solution between the guide panel and the edge of the hot rolled coil when the hot rolled coil enters, thereby effectively preventing frictional flaws.
이를 위해 먼저, 그라파이트 수용액이 인도판넬과 열연코일의 엣지부에 주입되도록 도 2(b)와 같이, 인도판넬에 홈(4)부 및 분출구(5)를 형성하는 것이 필요하다.To this end, first, it is necessary to form the groove 4 and the ejection opening 5 in the delivery panel, as shown in Figure 2 (b) so that the graphite aqueous solution is injected into the edge portion of the delivery panel and the hot rolled coil.
이 때 홈부(4)는 열연코일의 엣지부가 접촉하는 부위에 150-200mm의 곡률을 형성하는 것이다. 이는 곡률이 100mm미만의 경우 굴곡이 심해 그라파이트 수용액 분출구를 중심으로 열연코일엣지부의 진행이 집중되어 분출구중심으로 마모가 심하게 진행되며, 250mm를 넘으면 열연코일을 분출구주변에 유도시키는 역할이 상실되어 역시 인도판넬 마모와 함께 스테인레스열연코일 엣지부에 마찰흠을 발생시킨다.At this time, the groove portion 4 is to form a curvature of 150-200mm in the area where the edge portion of the hot rolled coil contacts. If the curvature is less than 100mm, the curvature is severe and the progress of hot rolled coil edge part is concentrated around the graphite aqueous solution outlet, and the wear progresses severely to the center of the jet port. Friction flaws occur in the edge of stainless steel coil along with panel wear.
상기와 같이 형성된 홈부(4)에 분출구(5)를 형성하는데, 이때의 분출구 간격은 100-200mm가 바람직한데, 이는 100mm 이하의 경우 열연코일의 엣지부에 그라파이트에 지나치게 많이 도포되어 열연공장 오염과 더불어 경제성을 저해하게 되고, 200mm를 넘으면 공급부족으로 인한 균일도포가 어렵기 때문이다.The
상기와 같이 인도판넬에 홈부 및 분출구를 형성하고, 이 인도판넬의 분출구를 통해 윤활작용하는 수용액을 주입한다. 이때의 수용액은 그라파이트를 30-40% 함유하는 수용액이 바람직하다. 그 이유는 그라파이트가 30%미만의 경우 그라파이트량 부족에 의한 윤활효과가 불충분한 것으로 판단되며, 40%를 넘으면 수용액이 지나친 점도를 갖게 되어 열연코일 엣지부에 그라파이트수용액이 균일하게 도포되지 않기 때문이다.As described above, a groove and a jet port are formed in the guide panel, and an aqueous solution lubricating through the jet port of the guide panel is injected. The aqueous solution at this time is preferably an aqueous solution containing 30-40% of graphite. The reason is that if the graphite is less than 30%, the lubricating effect due to the lack of graphite is insufficient, and if it exceeds 40%, the aqueous solution has an excessive viscosity, and the graphite aqueous solution is not uniformly applied to the edge of the hot rolled coil. .
상기 그라파이트 수용액을 주입할 때의 압력은 5∼15kgf/cm2으로 하는 것이 바람직한데, 그 이유는 압력이 5kgf/cm2를 넘어야 마찰흠이 발생하지 않으며, 20kgf/cm2를 넘으면 열연코일의 엣지부에 그라파이트에 지나치게 많이 도포되어 열연공장 오염의 원인이 될 가능성이 있기 때문이다. 이때의 공급유량은 수용액 분사압력과 수용액의 점도에 의존하는 것으로 적정 공급유량은 2.2∼11.1 ELL /min인 것으로판단된다. 이때, 그라파이트 수용액의 주입은 분출이 가능한 주입수단을 이용하면 되며, 일례로 도 2에 도시된 것처럼, 그라파이트 수용액 분출파이프를 이용하면 된다.Pressure at the time of injecting the graphite is an aqueous solution it is preferred that the 5~15kgf / cm 2, because the pressure is no friction generating inclusions have met the 5kgf / cm 2, 20kgf / cm 2 higher than the edge of the hot-rolled coil This is because too much coating of graphite on the part may cause contamination of the hot rolling mill. The supply flow rate at this time depends on the injection pressure of the aqueous solution and the viscosity of the aqueous solution, and the proper supply flow rate is determined to be 2.2-11.1 ELL / min. In this case, the injection of the graphite aqueous solution may use an injection means capable of jetting. For example, as shown in FIG. 2, the graphite aqueous solution injection pipe may be used.
이하, 본 발명을 실시예를 통하여 구체적으로 설명한다.Hereinafter, the present invention will be described in detail through examples.
[실시예 1]Example 1
아래 표 1은 STS430 열연코일이 인도판넬에 진입시 열연코일 엣지부에 그라파이트 수용액을 분출하였을 때 그라파이트 혼합비 및 수용액 분출압력에 따른 마찰흠 발생경향을 나타내는 것이다.Table 1 below shows the tendency of friction defects according to the graphite mixing ratio and the aqueous solution ejection pressure when the graphite aqueous solution is injected into the edge of the hot rolled coil when the STS430 hot rolled coil enters the sidewalk panel.
상기 표 1에 나타난 바와 같이, 그라파이트 수용액의 경우 물에 대한 그라파이트 함유비가 증가함에 따라 마찰흠 발생경향이 줄어 30∼40%에서 마찰흠이 발생하지 않으며, 약50% 이상에서는 다시 발생하고 있는 것으로 밝혀졌다.As shown in Table 1, in the case of the graphite aqueous solution, the tendency for the occurrence of frictional damage decreases as the graphite content to water is increased, and it is found that the frictional defect does not occur at 30 to 40%, and occurs again at about 50% or more. lost.
또한, 수용액 분출압력에서는 역시 분출압이 증가할수록 마찰흠 발생경향이 감소하는 것으로 나타나며, 그라파이트 혼합비가 20∼30%일 때 5kgf/cm2이상부터 마찰흠이 발생하지 않는 것으로 나타났다.In addition, in the aqueous solution ejection pressure, as the ejection pressure is increased, the tendency of frictional damage is decreased, and when the graphite mixing ratio is 20 to 30%, the frictional defect does not appear from 5 kgf / cm 2 or more.
[실시예 2]Example 2
아래 표 2는 그라파이트액 분출구 중심으로 70mm홈 부분의 곡률값(Radius)에 따른 마찰흠 발생효과를 나타내었다.Table 2 below shows the friction flaw generation effect according to the curvature value (Radius) of the 70mm groove portion centered on the graphite liquid outlet.
상기 표 2에 나타난 바와 같이, R값이 150∼200mm 인 경우 마찰흠발생이 없는 것으로 밝혀졌다.As shown in Table 2, when the R value is 150 ~ 200mm it was found that there is no friction scratch.
[실시예 3]Example 3
아래 표 3은 기존 및 본발명에 의한 스테인레스 열간압연방법을 사용하였을 경우의 마찰흠 발생경향을 나타내었다.Table 3 below shows the tendency of friction defects in the case of using the stainless hot rolling method according to the present invention and the present invention.
상기 표 3에 나타난 바와 같이, 먼저 기존압연방법은, STS430을 압연하였을 때 마찰흠 발생율이 20∼30%정도로 저조한 품질실적을 나타내고 있으나, 본 발명에 의한 스테인레스 열간압연방법을 사용하였을 경우는 마찰흠발생율이 0∼5% 정도로 품질이 매우 우수한 스테인레스 열연강판을 생산할 수 있다. 또한, 인도판넬 재료인SS400의 교체 주기도 3∼4배로 향상되기 때문에 재료비절감에 의한 원가절감효과가 있다.As shown in Table 3 above, the conventional rolling method shows a poor quality of the friction scratch rate of about 20 to 30% when rolling the STS430, but in the case of using the stainless hot rolling method according to the present invention It is possible to produce a stainless hot rolled steel sheet with a high quality of about 0 to 5%. In addition, since the replacement cycle of the SS400, the delivery panel material, is improved by 3 to 4 times, there is a cost reduction effect due to material cost reduction.
참고로, 기존방법 및 본 발명에 의한 열간시 인도판넬의 마모형상을 도식적으로 도 3에 나타내었다. 도 3(b)에 나타난 바와 같이, 본 발명에 의하면 그라파이트 수용액의 윤활효과 때문에 마모량이 매우 적으며 마모형상(10) 또한 부드러워 연질의 스테인레스강이 진입하더라도 엣지부에 마찰흠이 발생하지 않는다.For reference, the wear shape of the delivery panel during hot according to the existing method and the present invention is schematically shown in FIG. As shown in Figure 3 (b), according to the present invention due to the lubricating effect of the graphite solution, the wear amount is very small and the wear shape (10) is also soft, so that even if the soft stainless steel enters the edge does not cause friction scratches.
상술한 바와 같이, 본 발명은 스테인레스를 생산하는 열간압연공장의 열연코일 인도판넬에서 그라파이트수용액 분출장치를 설치분출하여 열연코일 인도판넬과 압연재표면 사이에 그라파이트 입자가 윤활작용을 할 수 있도록 하여 마찰흠을 효과적으로 방지함으로서 표면결함이 없는 우수한 표면품질의 스테인레스 열연강판을 제조할 수 있는 효과가 있다.As described above, the present invention installs and ejects a graphite aqueous solution ejection apparatus in a hot rolled coil induction panel of a hot rolling mill that produces stainless steel so that graphite particles can be lubricated between the hot rolled coil induction panel and the surface of the rolled material. By effectively preventing the flaw, there is an effect that can produce a stainless hot rolled steel sheet of excellent surface quality without surface defects.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970073570A KR100328086B1 (en) | 1997-12-24 | 1997-12-24 | Hot rolling method to prevent the wear defect of down coller side guide wear plate for stainless steel |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1019970073570A KR100328086B1 (en) | 1997-12-24 | 1997-12-24 | Hot rolling method to prevent the wear defect of down coller side guide wear plate for stainless steel |
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