KR100325338B1 - Hot rolling method for preventing sticking during finishing hot rolling of stainless steel - Google Patents
Hot rolling method for preventing sticking during finishing hot rolling of stainless steel Download PDFInfo
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- KR100325338B1 KR100325338B1 KR1019970070124A KR19970070124A KR100325338B1 KR 100325338 B1 KR100325338 B1 KR 100325338B1 KR 1019970070124 A KR1019970070124 A KR 1019970070124A KR 19970070124 A KR19970070124 A KR 19970070124A KR 100325338 B1 KR100325338 B1 KR 100325338B1
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- hot rolling
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- stainless steel
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- 238000005098 hot rolling Methods 0.000 title claims abstract description 29
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 18
- 239000010935 stainless steel Substances 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000005096 rolling process Methods 0.000 claims abstract description 51
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 19
- 230000006698 induction Effects 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 230000007547 defect Effects 0.000 claims description 7
- 239000000314 lubricant Substances 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 12
- 239000010410 layer Substances 0.000 description 7
- 238000005461 lubrication Methods 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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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
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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
- 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
- B21B45/004—Heating the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
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- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
Description
본 발명은 스테인레스강판을 생산하는 열간압연공장의 사상압연전단에서 주로 발생하는 스트릭킹(stlcking)현상을 방지하기 위해 4번조압연롤의 조압연설비출측에 고주파 유도 가열장치를 설치하여 스테인레스압연재가 사상압연 스텐드의 롤에 의해 압연되기 전에 압연재 표면에 스케일층을 형성시켜 압연시 롤과 압연재사이에서 윤활작용이 이루어지도록 한 스테인레스강의 사상압연시 표면결함 방지를 위한 열간압연 방법에 관한 것으로, 특히 스테인레스 열간압연공정중 사상압연 전단에서 주로 발생하는 스트릭킹현상(소성가공에서 피가공재 표층의 일부가 공구측으로 이착하여 제품의 표면품질을 해치는 현상)을 방지하기 위해 조압연 4번 롤의 조압연설비 출측에 고주파 유도가열장치를 설치하여 가열함으로서 스트릭킹현상을 효과적으로 방지할 수 있도록한 것이다.The present invention is to install a high-frequency induction heating device on the side of the rough rolling equipment of the fourth rolling mill in order to prevent the stricking phenomenon mainly occurring in the filamentary rolling shear of the hot rolling mill to produce stainless steel sheet In particular, the present invention relates to a hot rolling method for preventing surface defects during finishing rolling of stainless steel, in which a scale layer is formed on the surface of the rolling material before rolling by the roll of the rolling stand, so that lubrication is performed between the roll and the rolling material during rolling. Rough rolling facility of rough rolling No. 4 to prevent the stricking phenomenon that occurs mainly in the filament rolling shear during the stainless hot rolling process (a part of the surface layer of the workpiece moves to the tool side in the plastic working process and damages the surface quality of the product). Effectively prevents the stricking phenomenon by installing and heating high frequency induction heating device on the exit side It is to be done.
일반적으로 열연압연 공정에서 페라이트계 스테인레스강은 사상압연전단(사상압연롤 1.2.3번)에서 압연표층의 일부가 롤표면으로 하여 제품의 표면품질을 해치는 스트릭킹현상이 발생한다.In general, in the hot rolling process, ferritic stainless steel has a striping phenomenon in part of the rolling surface layer as the roll surface in the filamentary rolling shear (No. 1.2.3).
따라서 이러한 현상을 방지할 목적으로 스테인레스강판을 생산하는 열간압연공장에서는 조압연후단과 사상압연전단에서 롤과 압연재사이의 윤활압연을 위해 물과 기름의 혼합액을 열간압연 직전에 사상압연롤 표면에 분사하여 유막형성에 의한 압연재입자의 고온응착을 억제하고 있다.Therefore, in order to prevent this phenomenon, in a hot rolling mill that produces stainless steel sheets, a mixture of water and oil is applied to the finishing roll roll surface just before hot rolling for lubricating rolling between the roll and the rolled material in the rough rolling stage and the finishing rolling stage. By spraying, high temperature adhesion of the rolled material particles due to oil film formation is suppressed.
또한 상기의 현상을 억제할 목적으로 마찰계수가 적은 롤재질을 선택하여 적용하는 경우도 있다.In addition, a roll material having a small coefficient of friction may be selected and applied for the purpose of suppressing the above phenomenon.
이러한 종래의 기술들은 도 1과 같이 기름분사장치(20)로 기름을 분사함으로써 열연공장의 오염 및 냉각수오염등의 환경문제와 열간압연판의 통판성불량의 문제를 낳고 있으며, 또한 롤재질 선택은 스트릭킹 발생율 저감에 한계가 있고, 롤제조업체의 상황변화에 따라야 하므로 효과적이며, 적극적인 방법이 될 수 없었다.These conventional techniques are caused by the problem of environmental problems such as pollution of the hot rolling mill and contamination of the cooling water and the problem of mailing of the hot rolled plate by spraying oil into the
종래의 방법은 가열로에서 축출된 페라이트계 스테인레스 슬라브를 조압연 한 후 사상압연에 진입시 사상압연설비(30) 전단사상압연롤(31)(32)(33) 또는 백업롤에 위치한 기름분사기장치(20)를 이용하여 기름+고체윤활제를 분사(6개의 노즐로1,2,3번롤에 2ℓ/시간, 10kgF/㎠의 유압)하면 롤과 압연재사이에 유막이 형성되어 윤활효과가 발휘되므로 압연재입자의 이착을 억제하고 있다.The conventional method is to co-roll the ferritic stainless slab extracted from the heating furnace, and then enter the finishing rolling, and the oil spraying device (31), 32 (33) or the back-up roll is placed on the finishing rolling equipment (30). 20) by spraying oil + solid lubricant (2 l / hour on 1, 2, 3 rolls with 6 nozzles, 10kgF / ㎠ hydraulic pressure), oil film is formed between the roll and the rolled material to exert lubricating effect. The adhesion of the soft particles is suppressed.
그러나, 이러한 종래의 기술들은 스트릭킹현상을 방지하는 목적에는 충족될 수 있으나 기름 및 고체윤활제를 사용함으로서 열연공장의 분위기(분진)오염 및 냉각수오염등의 환경문제를 낳고 있으며, 윤활에 의한 사상압연공장의 통판성 악화 에 의한 잦은 사고를 일으켜 생산성에 악 영향을 미치고 있다.However, these conventional techniques can be satisfied for the purpose of preventing the stricking phenomenon, but by using oil and solid lubricants, environmental problems such as atmosphere (dust) pollution and cooling water pollution of the hot rolling mill, and the rolling mill by lubrication Frequent accidents caused by deterioration of the factory's mail order are adversely affecting productivity.
본발명은 상기의 문제점을 해소하고자 발명한 것으로, 스테인레스강판을 생산하는 열간압연 공장의 조압연설비 출측에 고주파 유도가열장치를 설치하여 스테 인레스압연재가 사상압연 스텐드의 롤에 의해 압연되기 전에 압연재 표면에 스케일층을 형성시켜 압연시 롤과 압연재사이에서 상기 스케일이 윤활작용을 하도록 함 으로서 스트릭킹현상을 효과적으로 방지하여 품질이 우수한 스테인레스 열연강판을 제조하는데 그 목적이있다.The present invention is invented to solve the above problems, by installing a high-frequency induction heating apparatus at the exit of the rough rolling equipment of the hot rolling mill that produces stainless steel sheet, before rolling the stainless steel rolls by the roll of the finishing rolling stand By forming a scale layer on the surface of the soft material to lubricate the scale between the roll and the rolling material during rolling to effectively prevent the streaking phenomenon to produce a high quality stainless hot rolled steel sheet.
이와 같은 목적을 갖는 본 발명은 스테인레스강판을 생산하는 열간압연공장의 조압연설비 4번롤 출측에 강판의 상하부 양 엣지부분 100∼400mm지점에 고주파 유도가열장치를 설치하고, 이를 이용하여 40∼50kW로 1200℃-1300℃로 가열한후,스테인레스압연재가 사상압연 스텐드의 롤에 의해 압연되기 전에 압연재 표면에 적정의 스케일층을 형성시켜 이 스케일이 압연시 롤과 압연재사이에서 윤활작용이 이루어지도록 하여서됨을 특징으로 한다.The present invention having such a purpose is to install a high-frequency induction heating device in the upper and lower edge portions of the steel sheet 100 ~ 400mm on the exit side of the fourth rolling equipment of the hot rolling mill to produce stainless steel sheet, using the 40 ~ 50kW After heating to 1200 ℃ -1300 ℃, before the stainless rolling material is rolled by the roll of the finishing rolling stand, an appropriate scale layer is formed on the surface of the rolling material so that the scale is lubricated between the roll and the rolling material when rolling. It is characterized by.
도 1은 종래의 열간압연방법을 나타낸 개략도.1 is a schematic view showing a conventional hot rolling method.
도 2는 본 발명의 열간압연방법을 나타낸 개략도.2 is a schematic view showing a hot rolling method of the present invention.
도 3은 본 발명 도 2의 A-A선 단면구성을 나타낸 개략도.Figure 3 is a schematic diagram showing the cross-sectional structure A-A line of Figure 2 of the present invention.
<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>
S : 열연판S: hot rolled sheet
10 : 조압연설비10: rough rolling equipment
20 : 기름 분사장치20: oil injector
21.22.23.24 :조압연롤21.22.23.24: Rolling mill
30 : 사상압연설비30: finishing rolling equipment
31.32.33 : 사상압연롤31.32.33: Finishing roll
40 : 고주파 유도 가열장치40: high frequency induction heating apparatus
본 발명은 스테인레스강판을 생산하는 열간압연 공장의 출측에 조압연설비(10)의 간섭이 없는 2500mm지점에 스테인레스 열연강판의 상하부 양 엣지부분 100∼400mm지점에 고주파 유도가열장치(40)를 설치한 후 40∼50kW로 가열하여 스테인레스 압연재가 사상압연 스텐드의 롤에 의해 압연되기 전에 압연재 표면 에 적정의 스케일 층을 형성시켜 압연시 롤과 압연재 사이에서 윤활작용이 이루어지도록 하므로서 스트릭킹 현상을 방지하도록 하였다.The present invention is to install a high frequency induction heating device (40) at the upper and lower both edge portions of 100 ~ 400mm in the 2500mm point without interference of the rough
한편 스트릭킹현상은 롤과 압연재의 접촉호내에서 발생되는 현상으로서 롤과 압연재 사이에 윤활제가 존재하면 윤활압연에 의해 압연시 스트릭킹발생의 핵생성 처가 감소하게 되어 스트릭킹발생율을 크게 감소시킬 수 있다.On the other hand, the stricking phenomenon is a phenomenon occurring in the contact arc between the roll and the rolled material. If a lubricant is present between the roll and the rolled material, the nucleation of the stricking occurrence during rolling is reduced by lubrication rolling, which greatly reduces the incidence of streaking. Can be.
또한 본 발명은 고주파유도가열장치(40) 코일사이즈: 압연방향 450mm, 압연폭방향: 300mm를 스테인레스 열연강판의 상하부 양 엣지부분 100∼400mm지점에 위치하게 하여 40∼50kW로 강판의 표면을 순간 가열하여 1200℃-1300도시로 상승시키면 고열의 발생과 함께 산소요구량이 많아져 이 부분에 새로운 스케일층이 형성하게 된다.In addition, the present invention is the high frequency
이처럼 이 부분에 스케일을 인위적으로 형성시키는 이유는, 스트릭킹결함이 스테인레스 열연강판의 양 엣지 100∼400mm지점에서 주로 발생하고 있기 때문에 이부분에 새로운 스케일층을 형성시켜 주면 이 스케일이 롤과 압연재 사이에서 윤활 제 역할을 할수 있으므로 이로인한 윤활압연이 이루어지도록 하면 스트릭킹 현상 방지를 위한 열간압연방법의 효과를 나타낼 수 있다.The reason why the scale is artificially formed in this part is that the stricking defect is mainly generated at 100 to 400mm at both edges of the stainless hot rolled steel sheet. Since it can act as a lubricant between the lubrication rolls due to this can have the effect of the hot rolling method for preventing the stricking phenomenon.
(실시예)(Example)
하기표 1은 STS430J1L압연판 표면에 고주파유도가열장치(40)에 의한 가열을 하였을 경우, 압연판 표면에 형성된 스케일층의 두께에 따른 스트릭킹 결함 발생 경향을 나타낸 것이다.Table 1 below shows the tendency of stricking defects according to the thickness of the scale layer formed on the surface of the rolled plate when the surface of the STS430J1L is heated by the high frequency
고구파유도 가열장치(40)의 파워(KW)가 증가함에 따라 30KW까지는 스트릭킹발생 경향이 감소하는 것으로 나타나고 있으며, 30KW이상에서는 스트릭킹현상이 거의 발생하지 않는 것으로 밝혀졌다.As the power (KW) of the high-frequency
따라서 스테인레스강의 스트릭킹현상을 방지하기 위해서는 고주파유도 가열 장치(40)의 파워(KW)를 40∼50kW할 때 가장 효과적이고 경제적으로 결함방지를 할 수 있음을 알수 있다.Therefore, in order to prevent the stricking phenomenon of stainless steel, it can be seen that the most effective and economical defect can be prevented when the power KW of the high frequency
[표 1]TABLE 1
430J1L 압연판 표면에 형성된 스케일층의 두께에 따른 스트릭킹 결함발생 경향The tendency of stricking defects according to the thickness of scale layer formed on the surface of 430J1L rolled sheet
하기표 2는 종래 및 본 발명에 의한 스테인레스 열간압연방법을 사용하였을경우의 스트릭킹 발생 경향을 나타내는 것으로서, 먼저 종래 압연방법(기름 및 고체윤활제를 사용하는 유압연방법)는 STS430 경우 스트릭킹 발생율이 0∼5%, Cr함량이 높은 STS430J1L은 10∼20%정도로 비교적 우수한 품질을 나타내고 있으나 기름 및 고체윤활제 사용에 의한 환경오염이 발생하고 있어 바람직한 방법이 될 수 없다.Table 2 shows the tendency of the occurrence of stricking when using the stainless hot rolling method according to the prior art and the present invention, first, the conventional rolling method (hydraulic rolling method using oil and solid lubricant) is 0 in the case of STS430 STS430J1L, which has a high content of 5% and Cr, has a relatively good quality of about 10 to 20%. However, environmental pollution caused by the use of oils and solid lubricants is not a preferable method.
그러나 본 발명에 의한 스테인레스 열간압연방법은 STS430 경우 스트릭킹발생율이 0%, STS430J1L은 0∼5%정도로 품질이 매우 우수한 스테인레스 열연 강판을 생산할 수 있다.However, the stainless hot rolling method according to the present invention can produce a stainless steel hot rolled steel sheet having a very good quality in the case of STS430 streaking incidence is 0%, STS430J1L is 0 to 5%.
[표 2]TABLE 2
종래 및 본 발명에 의한 조건의 스트릭킹발생율 상호비교Comparing the incidence of stricking rates of the conditions according to the prior art and the present invention
이상과같은 본 발명은 열연공장설비에서 스테인레스강을 열간압연시 발생하는 스트릭킹현상을 방지하기 위해 조압연 설비의 출측에 강판의 상하부 양 엣지부분에 고주파 유도가열장치를 설치하고 가열하여 스트릭킹현상을 효과적으로 방지함으로서 스트릭킹결함이 없는 우수한 표면품질의 스테인레스 열연강판을 제조할 수있는 효과가 있다.In the present invention as described above, in order to prevent the stricking phenomenon occurring during hot rolling of stainless steel in the hot rolling mill equipment, high frequency induction heating devices are installed and heated at the upper and lower edge portions of the steel sheet at the exit side of the rough rolling equipment, and the stricking phenomenon occurs. By effectively preventing the effect of producing a stainless hot rolled steel sheet of excellent surface quality without the stricking defects.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970070124A KR100325338B1 (en) | 1997-12-17 | 1997-12-17 | Hot rolling method for preventing sticking during finishing hot rolling of stainless steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970070124A KR100325338B1 (en) | 1997-12-17 | 1997-12-17 | Hot rolling method for preventing sticking during finishing hot rolling of stainless steel |
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| Publication Number | Publication Date |
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| KR19990050932A KR19990050932A (en) | 1999-07-05 |
| KR100325338B1 true KR100325338B1 (en) | 2002-08-08 |
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| KR1019970070124A KR100325338B1 (en) | 1997-12-17 | 1997-12-17 | Hot rolling method for preventing sticking during finishing hot rolling of stainless steel |
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| KR100711385B1 (en) * | 2005-12-19 | 2007-04-30 | 주식회사 포스코 | A method for diminishing slit camber of stripping plate |
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