KR920000767B1 - Method of winding up a hot rolled low and medium carbon steel - Google Patents
Method of winding up a hot rolled low and medium carbon steel Download PDFInfo
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- KR920000767B1 KR920000767B1 KR1019890019753A KR890019753A KR920000767B1 KR 920000767 B1 KR920000767 B1 KR 920000767B1 KR 1019890019753 A KR1019890019753 A KR 1019890019753A KR 890019753 A KR890019753 A KR 890019753A KR 920000767 B1 KR920000767 B1 KR 920000767B1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
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Abstract
Description
제1도는 저, 중탄소강에 대한 응력 변형율곡선.1 is a low, medium strain curve for carbon steel.
제2도는 열연판의 두께 및 단위장력 변화에 따른 결함발생 여부를 나타내는 도식도.2 is a schematic diagram showing whether a defect occurs according to a change in thickness and unit tension of a hot rolled sheet.
본 발명은 저, 중탄소강의 열간압연공정에 적용되는 열연권취 방법에 관한 것으로서, 보다 상세하게는, 열연 권취시 열연판의 두께 및 강종에 따라 권취장력을 제어하여 열연판에 발생되는 결함을 방지할 수 있는 향상된 저, 중탄소강의 열연권취방법에 관한 것이다.The present invention relates to a hot rolled winding method applied to the hot rolling process of low and medium carbon steel, and more particularly, to prevent the defects generated in the hot rolled sheet by controlling the winding tension according to the thickness and steel type of the hot rolled sheet during the hot rolled winding. The present invention relates to an improved method for hot rolling of low and medium carbon steels.
일반적으로, 열연판은 취급과 운반을 용이하게 하기 위하여 스트립을 코일형태로 권취하게 되며, 권취된 열연판을 정정라인에서 되감기(Recoiling)를 수행하는 것이 보통이며, 직접 수요가에 판매되거나 냉연판을 제조하기 위하여 냉연공정으로 이동된다.In general, hot rolled sheets are wound in a coil form to facilitate handling and transport, and it is common to perform recoiling of the wound hot rolled sheets on a correction line, and are sold directly at demand or cold rolled sheets. It is moved to the cold rolling process to produce.
열연판을 권취기에서 코일형태로 권취할 때 폭네킹(Necking) 및 코일 짱구 현상이 발생되며, 정정되감기 또는 수요가 2차 가공시 판에 곱쇠 및 긁힌 흠등이 발생되어 품질저하와 제품실수율에 막대한 영향을 마치게 된다.When winding the hot rolled sheet in the form of a coil in the coiler, the necking and coil craters are generated, and the correction and rewinding or demand of the hot rolled plate are caused by the bumps and scratches on the plate, which greatly reduces the quality and product yield. The impact is over.
이러한 열연판의 결함을 해결하기 위하여 종래에는 강종 즉 탄소함량을 무시하고 단지 두께 변화만을 고려하여 두께에 따라 모든 강종에 대해 단위 권취장력을 적용하여 왔다.In order to solve the defect of the hot-rolled sheet, conventionally, the unit winding tension is applied to all steel grades according to the thickness in consideration of the change in thickness, ignoring the steel grade, that is, the carbon content.
그러나 두께에 따라 모든 강종에 대하여 단위권취장력을 적용할 경우, 0.06∼0.13%의 탄소를 함유하는 열연판에 대해서는 상기 결함현상을 방지할 수 있으나 0.01∼0.06%의 C의 저탄소강 및 0.13∼0.3% C의 중탄소강에 대해서는 상기한 4가지 결함을 동시에 방지할 수 없었다.However, if the unit winding tension is applied to all steel grades according to the thickness, the defects can be prevented for the hot rolled sheet containing 0.06 to 0.13% of carbon, but 0.01 to 0.06% of low carbon steel and 0.13 to 0.3 For the medium carbon steel of% C, the above four defects could not be prevented at the same time.
종래와 같이, 두께에 따른 단일 권취장력 적용시 열연판에 발생되는 결함은 권취시 강종에 따라 변화되는 고온 항복 강도와 밀접한 관계가 있는 것으로서, 중탄소강에서는 고온 항복강도가 커져 상대적 장력 부족이 발생하여 열연판간 갭이 크게 되고 이로 인해 느슨한 코일이 발생하여 코일 자체 하중에 의한 코일 짱구현상이 발생될 뿐만아니라 정정되감기시 스트립간 마찰이 생겨 긁힌 흠이 발생되고, 저탄소강에서는 권취시 고온항복강도가 적어 상대적 장력 상승에 따른 탄성변형이 증가하므로서 장력에 의한 권취시 중립선이 하부로 이동하여 권취시 열연판이 상부의 소성영역을 증가시키므로서 되감기때 열연판의 굴곡(곱쇠)이 발생된다.As in the prior art, defects generated in a hot rolled sheet when applying a single winding tension according to thickness are closely related to the high temperature yield strength that changes depending on the steel type during winding. The gap between the hot rolled sheets is large, and this causes loose coils to cause coil duckballs due to the coil's own load, as well as friction between strips during correction and rewinding, resulting in scratches. As the elastic deformation increases due to the increase in relative tension, the neutral line moves downward when the coil is wound due to tension, and when the coil is wound, the hot rolled sheet increases the plastic area of the upper part, thereby causing bending (curling) of the hot rolled sheet.
또한, 저탄소강으로 갈수록 사상압연의 마무리온도가 높고 변형저항도 적어 저탄소강 및 박물로 갈수록 단일 권취장력 제어시 네킹이 크게 발생된다.In addition, the higher the finishing temperature of finishing rolling and the lower the deformation resistance as the carbon steel goes down to the low carbon steel, the necking is greatly generated during the single winding tension control toward the low carbon steel and the thin film.
상기 결함발생현상을 도면에 의해 보다 상세히 설명하면 다음과 같다.The defect occurrence phenomenon will be described in more detail with reference to the accompanying drawings.
제1도는 저탄소강(C : 0.01∼0.06%) 및 중탄소강(C : 0.13∼0.3%)에 대한 권취온도에서의 응력-변형율 곡선을 나타내며, 제2도는 종래와 같이 단일강종(C : 0.01∼0.3%)의 두께 변화만을 고려한 단위 장력을 적용할 경우 열연판의 두께 및 단위장력 변화에 대한 결함발생여부를 나타낸 것으로서, 실선은 열연판에 결함이 발생되지 않는 두께에 대한 단위 장력의 임계라인을 나타낸 것이다.FIG. 1 shows the stress-strain curves at winding temperatures for low carbon steels (C: 0.01 to 0.06%) and medium carbon steels (C: 0.13 to 0.3%), and FIG. 2 shows a single steel type (C: 0.01 to When applying the unit tension considering only the thickness change of 0.3%), it shows whether there is a defect in the thickness and the unit tension change of the hot rolled sheet, and the solid line indicates the critical line of the unit tension with respect to the thickness where the defect does not occur in the hot rolled sheet. It is shown.
제1도에서 알수 있는 바와 같이, 종래와 같이 두께만을 고려한 단위장력(U.T)적용시 중탄소강이 저탄소강에 비해 탄성에너지가 적기 때문에 중탄소강(C : 0.13∼0.3%)의 경우 결함없이 열연판을 권취하기 위한 단위장력(U.T)값은 제2도의 실선((C : 0.06∼0.13%)에 대한 임계장력을 나타낸 것임)보다 위로 상승하게 되어 두께 변화만을 고려하여 단위장력(U.T)을 적용할 경우에는 코일 짱구영역에 놓이게 된다.As can be seen in FIG. 1, when applying the unit tension (UT) considering only the thickness as in the prior art, since the medium carbon steel has less elastic energy than the low carbon steel, in the case of the medium carbon steel (C: 0.13 to 0.3%) without a defect, the hot rolled sheet The unit tension (UT) value for winding is increased above the solid line ((C: 0.06 ~ 0.13%) of FIG. 2), and the unit tension (UT) can be applied considering only the thickness change. In this case, the coil is placed in the cranial area.
따라서, 중탄소강(C : 0.13∼0.3%)에서는 단일 강종의 두께 변화만을 고려한 단위장력(U.T)값 보다는 높여주어야 코일 짱구현상을 방지할 수 있다.Therefore, in the medium carbon steel (C: 0.13 to 0.3%), the coil duck ball phenomenon may be prevented by increasing the unit tension (U.T) value considering only the thickness change of a single steel type.
그러나, 상기 중탄소강의 경우와 같이 단위장력(U.T)값을 높여주는 경우 저탄소강은 네킹라인을 크게 넘게 되어 폭네킹 현상이 발생된다.However, when the unit tension (U.T) value is increased as in the case of the medium carbon steel, the low carbon steel greatly crosses the necking line, thereby causing a wide necking phenomenon.
한편, 저탄소강(C : 0.01∼0.06%)의 경우를 살펴보면, 저탄소강의 연신율이 중탄소강의 연실율보다 커 열연판상부의 연신율이 커지므로 판의 중립라인(Neutral line)이 하부로 이동되어 결국 골곡을 증가시키게되며, 이를 방지하기 위해서는 저탄소강의 경우 실선보다 단위장력(U.T)을 낮추어 중립라인의 이동을 감소시킴으로서 코일브랙(곱쇠)을 방지시킬 수 있다.On the other hand, in the case of low carbon steel (C: 0.01 ~ 0.06%), the elongation of the low carbon steel is greater than that of the medium carbon steel, the elongation of the upper portion of the hot-rolled sheet increases, so the neutral line of the plate is moved downward To prevent this, the low carbon steel can prevent the coil break by reducing the unit tension (UT) than the solid line to reduce the movement of the neutral line.
특히, 박물재의 저탄소강에서는 네킹이 매우 크게 발생되는데 그 원인은 저탄소강으로 갈수록 사상압연의 최종롤에서의 열연판의 온도가 높고 변형저항이 적어 네킹라인이 하부로 이동하게 되므로 저탄소강에서는 상대적 단위장력(U.T)을 낮추므로서 이를 감소시킬수 있다.Particularly, in the low carbon steel of the material, the necking is very large. The cause of this is the relative unit in the low carbon steel because the necking line moves downward because the temperature of the hot rolled sheet in the final roll of finishing rolling is higher and the deformation resistance is less. This can be reduced by lowering the tension (UT).
그러나, 저탄소강의 경우와 같이, 단일 강종 권취장력하에서 네킹을 감소시키기 위하여 단위장력(U.T)을 낮추는 경우 중탄소강에서는 상대적 탄성력 저하로 느슨한 권취가 되어 코일 짱구 및 느슨한 코일이 발생하여 정정되감기 작업시 장력불균일 및 열간압연판 상, 하간의 미끄러짐에 의한 마찰로 긁힌홈이 다량 발생하게 된다.However, as in the case of low carbon steel, when the unit tension (UT) is lowered to reduce the necking under a single steel winding tension, in the medium carbon steel, coil winding and loose coil are generated due to the decrease of the relative elastic force, resulting in tension during the rewinding operation. A large amount of scratched grooves are generated due to friction caused by non-uniformity and slipping on the hot rolled sheet.
상기 내용을 종합해 보면, 종래와 같이 강종을 무시하고 두께만을 고려한 단위장력을 적용하여 열연권취하는 경우 0.06∼0.13%의 탄소를 함유하는 열연판 권취시에는 결함발생을 방지할 수 있으나 0.01∼0.06% 및 0.13∼0.3%의 탄소를 함유하는 열연판에 대해서는 일부결함발생은 방지할 수 있지만, 상기한 4가지 결함을 동시에 모두 방지할 수 없다는 문제점이 있었다.In summary, in the case of hot-rolled winding by applying unit tension considering thickness only, ignoring steel grades as in the prior art, defects may be prevented when winding hot-rolled sheets containing 0.06 to 0.13% of carbon, but 0.01 to 0.06. Although some defects can be prevented with respect to the hot rolled sheet containing% and 0.13 to 0.3% of carbon, there is a problem that all four defects described above cannot be prevented at the same time.
따라서, 본 발명은 열연판을 두께에 덧붙여 탄소강의 강종도 고려하므로서 네킹, 코일 짱구, 곱쇠 및 긁힌 흠등이 동시에 발생되지 않는 향상된 저, 중탄소강의 열연권취방법을 제공하고자 하는데 그 목적이 있다.Accordingly, an object of the present invention is to provide an improved low and medium carbon steel hot rolled winding method in which necking, coil duckbills, goose bumps, and scratches are not generated at the same time while considering the steel grade of carbon steel in addition to the hot rolled sheet.
이하, 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail.
본 발명은 0.01∼0.3%의 탄소를 함유하는 열연판을 권취하는 방법에 있어서, 0.01∼0.06% 및 0.13∼0.3%의 탄소를 함유하는 열연판을 하기식에 의해, 계산된 단위장력(U.T)2하에서 권취하는 저, 중탄소강의 열연권취방법에 관한 것이다.The present invention relates to a method for winding a hot rolled sheet containing 0.01 to 0.3% carbon, wherein a unit tension (UT) calculated by the following formula is obtained for a hot rolled sheet containing 0.01 to 0.06% and 0.13 to 0.3% carbon The present invention relates to a hot rolled winding method of a low and medium carbon steel wound under two .
(상기 식에서, ε1: 열연 권취온도에서의 0.06∼0.13%의 탄소를 함유하는 열연판의 변형율(%)(0.5%를 기준으로함)(Equation ( 1) : ε 1 : strain (%) of the hot rolled sheet containing 0.06 to 0.13% of carbon at the hot rolling temperature (based on 0.5%)
ε2: 열연 권취온도에서의 0.01∼0.06% 및 0.13∼0.3%의 탄소를 함유하는 열연판의 변형율(%)ε 2 : Strain rate (%) of the hot rolled sheet containing 0.01 to 0.06% and 0.13 to 0.3% carbon at the hot rolled winding temperature
Yp1: 열연권취온도에서의 0.06∼0.13%의 탄소를 함유하는 열연판의 항복강도(㎏/㎟)Yp 1 : Yield strength of hot rolled sheet containing 0.06 to 0.13% of carbon at hot rolled winding temperature (kg / mm2)
Yp2: 열연권취온도에서의 0.01∼0.06% 및 0.13∼0.3%의 탄소를 함유하는 열연판의 항복강도(㎏/㎟)Yp 2 : Yield strength of hot rolled sheet containing 0.01 to 0.06% and 0.13 to 0.3% carbon at hot rolling temperature (kg / mm2)
(U.T)1: 0.06∼0.13%의 탄소를 함유하는 열연판의 두께에 따라 변화되는 단위장력(UT) 1 : Unit tension varies according to the thickness of hot rolled sheet containing 0.06 to 0.13% of carbon
(U.T)2: 0.01∼-0.06% 및 0.13∼0.3%의 탄소를 함유하는 열연판의 단위장력(UT) 2 : Unit tension of hot rolled sheet containing 0.01 to-0.06% and 0.13 to 0.3% carbon
열연권취시 상기 식에 의해서 계산된 단위 장력(U.T)2이상으로 장력이 적용되는 경우에는 네킹 및 코일 브랙이 발생되며, (U.T)2보다 낮게 단위장력이 부여되는 경우에는 코일긁힘 및 코일짱구현상이 발생된다.If the tension in a unit tension (UT) 2 or more calculated by the above equation during hot rolling take-up to be applied in the case which is generated necking and coil Bragg, (UT) than lower the unit tension applying 2 coil scratches and coil duckbill phenomenon Is generated.
상기 (U.T)2는 두께만을 고려한 종래의 단위장력(U.T)1에 근거하고 여기에 탄소량의 변화에 따라 단위장력변화를 추가로 고려하여 결정되는 값으로서, (U.T)1은 통상 다음과 같이 정의된다.The (UT) 2 is a value determined based on the conventional unit tension (UT) 1 considering only the thickness and additionally considering the unit tension change according to the change in the amount of carbon, and (UT) 1 is generally as follows. Is defined.
열연판의 두께가 1∼3.2㎜인 경우에는
상기에서, t는 열연판의 두께를 나타내고
상기 α값은 열연판의 두께 즉 권취횟수에 따라 변화되게 되는 것으로서, 열연판의 두께가 박물로 갈수록 권취횟수가 증가되어 결국 α값이 적어지게 되며, 열연판의 두께가 두꺼워질수록 권취횟수가 감소되어 결국 α값이 커지게 된다.The α value is to be changed according to the thickness of the hot rolled sheet, that is, the number of winding, and as the thickness of the hot rolled sheet increases to thin, the winding number increases, and thus the α value decreases. As the thickness of the hot rolled sheet becomes thicker, the number of windings is increased. It decreases and eventually a value becomes large.
따라서, 열연판의 결함발생을 방지하기 위하여 상기 α값을 열연판의 두께변화에 따라 변화되지 않도록 일정하게 유지하여야 하며, 이를 유지하기 위해서는 (U.T)1을 변화시켜 적용하여야 한다.Therefore, in order to prevent defects of the hot rolled sheet it should be kept constant so as not change according to the thickness change of the hot-rolled sheet to the α value, in order to maintain them to be applied by changing the (UT) 1.
실제 열연공정에서는 상기 α값이 여러가지 열연조건에 따라 경험측에 의해 결정되어 있으며, 소정두께의 열연판에 대하여 α값이 결정되면 (U.T)1은 상기 식(2)와 (3)에 의해 결정된다.In an actual hot rolling step and wherein the α value is determined by the experience side according to the number of hot rolling conditions, when the α value is determined with respect to hot-rolled sheet having a predetermined thickness (UT) 1 is determined by the formula (2) and (3) do.
또한, 상기 열연권취온도는 대략 400∼760℃이며, 보다 바람직한 온도는 580∼620℃이다.Moreover, the said hot rolled coiling temperature is about 400-760 degreeC, and more preferable temperature is 580-620 degreeC.
이하, 실시예를 통하여 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail through examples.
[실시예]EXAMPLE
0.01-0.06% 및 0.13-0.3% 탄소함량을 갖는 열연판을 600℃의 권취온도에서 상기식(1)에 의하여 계산된 단위장력을 적용하여 열연권취하였으며, 또한, 종래방법과 비교하기 위하여 두께만을 고려한 단위장력을 0.01∼0.3%탄소함량을 갖는 열연판에도 적용하여 열연판의 결함 발생여부를 관찰하였다.The hot rolled sheet having 0.01-0.06% and 0.13-0.3% carbon content was hot rolled by applying the unit tension calculated by the above formula (1) at a winding temperature of 600 ° C. The considered unit tension was also applied to the hot rolled sheet having the carbon content of 0.01 to 0.3% to observe the defect occurrence of the hot rolled sheet.
상기 식(1)에 의해 계산된 단위장력으로 0.01∼0.06% C 및 0.13∼0.3% C의 열연판을 권취한 경우에는 어떠한 결함도 발생되지 않았으나, 두께변화만을 고려한 단위장력을 0.01-0.3% C의 열연판에 적용한 경우, 0.06-0.13%의 열연판에서는 상기한 바와 같이 어떠한 결함도 발생되지 않았으나, 0.01∼0.06%의 열연판에서는 네킹 및 코일브랙이 발생되었으며, 또한, 0.13∼0.3%의 열연판에서는 코일 긁힘 및 짱구코일 현상이 발생되었다.When winding the hot rolled sheet of 0.01 to 0.06% C and 0.13 to 0.3% C as the unit tension calculated by Equation (1), no defects occurred, but the unit tension considering only the thickness change was 0.01-0.3% C. When applied to the hot rolled sheet of the hot-rolled sheet of 0.06-0.13% of the hot-rolled sheet did not generate any defects as described above, but in the 0.01 to 0.06% hot-rolled sheet, the necking and coil break occurred, and also 0.13 to 0.3% hot rolled sheet In the plate, coil scratches and duckbill coiling occurred.
상술한 바와 같이, 본 발명은 정정 Skin pass를 실시하지 않고 압연 작업공정에서 곱쇠를 방지할 수 있으므로, 다음공정에서 부하를 감소시킬 수 있고, 또한, 저탄소강에서의 네킹감소로 폭네킹을 줄이게 되었고 또한 짱구 코일 및 느슨 코일 방지로 정정 되감기시 발생되는 긁힌 홈을 감소시켜 정정 생산성 및 실수율을 향상시키므로서 열연제품의 품질향상에 크게 기여할 수 있는 효과가 있는 것이다.As described above, the present invention can prevent the gops in the rolling operation process without performing a correct skin pass, thereby reducing the load in the next step, and also reduced the width necking by reducing necking in low carbon steel. In addition, by preventing the duckbill coil and the loose coil to reduce the scratches generated during the rewinding to improve the correction productivity and error rate is that it can contribute significantly to the quality of the hot rolled products.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019890019753A KR920000767B1 (en) | 1989-12-27 | 1989-12-27 | Method of winding up a hot rolled low and medium carbon steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019890019753A KR920000767B1 (en) | 1989-12-27 | 1989-12-27 | Method of winding up a hot rolled low and medium carbon steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR910011352A KR910011352A (en) | 1991-08-07 |
| KR920000767B1 true KR920000767B1 (en) | 1992-01-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019890019753A KR920000767B1 (en) | 1989-12-27 | 1989-12-27 | Method of winding up a hot rolled low and medium carbon steel |
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| Country | Link |
|---|---|
| KR (1) | KR920000767B1 (en) |
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1989
- 1989-12-27 KR KR1019890019753A patent/KR920000767B1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR910011352A (en) | 1991-08-07 |
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