CN102719742B - Furnace zone through plate method of limit-specification IF steel - Google Patents
Furnace zone through plate method of limit-specification IF steel Download PDFInfo
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- CN102719742B CN102719742B CN201210205030.7A CN201210205030A CN102719742B CN 102719742 B CN102719742 B CN 102719742B CN 201210205030 A CN201210205030 A CN 201210205030A CN 102719742 B CN102719742 B CN 102719742B
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Abstract
The invention discloses a limit-specification IF (interstitial-free) steel and a furnace zone through plate method thereof, belonging to the technical field of cold rolled sheet strip annealing. The IF steel comprises the following components in percentage by weight: not more than 0.0015 of C, not more than 0.03 of Si, 0.1-0.14 of Mn, not more than 0.01 of P, not more than 0.01 of S, 0.02-0.045 of Alt, 0.06-0.08 of Ti, not more than 0.004 of N, and the balance of Fe; and the heating zone temperature is 815-825 DEG C, the slow cooling zone temperature is 620-630 DEG C, the fast cooling zone temperature is 340-350 DEG C, and the overaging temperature is 350-360 DEG C. According to the invention, by optimizing furnace zone tension, lowering furnace zone temperature, reducing roller body temperature difference, preventing steel strip from off-tracking and other methods, furnace zone stable through plate of automobile plates with thin wide specification is realized and the annealing plate shape quality is significantly improved.
Description
Technical field
The invention belongs to cold rolled sheet annealing technology field, relate to a kind of logical plate method in Limit specifications IF steel and stove district thereof.
Background technology
IF steel, gapless atomic steel, also claims ultra low-carbon steel sometimes, has extremely excellent deep drawability, elongation and r value can reach more than 50% and 2.0 now, in automotive industry, are widely applied.In IF steel, because C, N content are low, adding the strong carboritride forming element such as a certain amount of titanium (Ti), niobium (Nb), the interstitial atoms such as the carbon in ultra low-carbon steel, nitrogen are completely fixed as carboritride, thereby the clean ferritic steel of the gap-free atom obtaining, is Ultra-low carbon gapless atomic steel.
The main thickness range of auto sheet is 0.7～1.2mm, width range is 1400～1800mm, take EDDQ/SEDDQ-IF steel plate as main, the principal feature of auto sheet is carbon content low (C≤0.002%), there is good deep drawability, but, very easily to there is high temperature wooden dipper in the IF steel of thin wide specification bent in stove, cannot the company of realization move back unit at a high speed, efficiently, high-quality production, if to have there is serious wooden dipper in thin wide specification auto sheet bent in stove, blow-on major disaster may finally cause stopping, process stove district wooden dipper about bent 20 hours accident used times, not only had a strong impact on rhythm of production, the quantity scrapped producing is considerable, when the thin wide specification auto sheet that is 0.71*1770mm with steel specification is come out of the stove, at plate, there is slight wooden dipper Qu Xianxiang at wide 1/4th places, its strip shape quality cannot meet client's demand.Therefore, the logical plate in thin wide specification stove district and improve the production bottleneck that annealed sheet shape is all continuous annealing unit problem demanding prompt solution ，Shi enterprise.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of annealed sheet shape and stable Limit specifications IF steel and logical plate method thereof of improving.
An IF steel, its composition by weight percentage ratio comprises: C≤0.0015, Si≤0.03, Mn:0.1-0.14, P≤0.01, S≤0.01, Alt:0.02-0.045, Ti:0.06-0.08, N≤0.004, surplus is: Fe.
A kind of Limit specifications IFGang Lu district leads to plate method, the temperature that comprises the steps: each stage of its continuous annealing is: heating zone temperature is 815-825 ℃, slow cooling section temperature is 620-630 ℃, and fast cold section of temperature is 340-350 ℃, and overaging temperature is 350-360 ℃.
Further, the temperature in described each stage of continuous annealing is: heating zone temperature is 820 ℃, and slow cooling section temperature is 625 ℃, and fast cold section of temperature is 345 ℃, and overaging temperature is 355 ℃.
Further, the tension force in described stove each stage of district is: heating zone tension force is 5.5-6.5KN, and overaging tension force is 4.6-5.2KN.
Further, the tension force in described stove each stage of district is: heating zone tension force is 6KN, and overaging tension force is 5KN.
Further, the Limit specifications thickness of described IF steel comprises 0.6mm, 0.7mm or 0.8mm.
Further, the Limit specifications width of described IF steel comprises 1640mm, 1775mm or 1850mm.
A kind of Limit specifications IF steel provided by the invention and stove district thereof lead to plate method, by optimizing stove district tension force, reduce stove district temperature, reduce the body of roll temperature difference, preventing the methods such as strip running deviation, not only realized the stable logical plate in thin wide specification automobile slab furnace district, also significantly improved annealing strip shape quality, solve Limit specifications IFGang Lu district wooden dipper Qu Wenti, expanded continuous annealing line product structure.
Accompanying drawing explanation
Fig. 1 is the plate shape schematic diagram that in prior art prepared by the logical plate method in Limit specifications IFGang Lu district;
The plate shape schematic diagram that Fig. 2 is prepared for the logical plate method in a kind of Limit specifications IFGang Lu district that the embodiment of the present invention provides.
Embodiment
The invention provides the logical plate method in a kind of Limit specifications IFGang Lu district, its composition by weight percentage ratio is: C≤0.0015, Si≤0.03, Mn:0.1-0.14, P≤0.01, S≤0.01, Alt:0.02-0.045, Ti:0.06-0.08, N≤0.004, surplus is: Fe.
By carrying out following concrete operations main points:
1, first confirm the production program.Thin wide material annealing temperature, thickness, the transition of width should be as far as possible little.Concentrate as far as possible scheduling and produce thin wide specification auto sheet, at continuous transition, do not cause producing in the unsettled situation of the working of a furnace thin wide material.
2, thin wide material enters before stove, by narrow, to wide transit time, should shift to an earlier date roll change, when working roll is chrome plating coating, can shift to an earlier date 20 kilometers of roll changes, creates the stable working of a furnace and guarantees producing along steady of thin wide material.
3, thin wide material enters before stove, and 5 volumes are switched to manual setup control pattern by heating mode in advance, prevents from automatically controlling the fluctuation up and down of lower annealing temperature.
When 4, thin wide material is produced, in guaranteeing stove, with steel unit, under the prerequisite of sideslip, do not reduce each section of tension force of stove as far as possible.It is 5.5-6.5KN that heating zone tension range is set, and it is 4.6-5.2KN that overaging tension range is set, and notes observing bellows and wipes scuffing, and bellows are apart from setting 70-80mm.
When 5, thin wide material is produced, temperature, tension force must at least shift to an earlier date one and lick and crossed, and settle out, during specifications vary, in heating outlet speed setting annealing temperature, must guard against frequent adjustment, adjust interval and be preferably in more than 10 seconds, the maximum coil of strip of flakiness ratio enters stokehold, and various parameters are more stable, band steel is just more smooth, otherwise more adjusts more random.Note to observe the poor and band temperature difference of the furnace temperature of each section, should control in the reasonable scope, prevent that wooden dipper curly hair is raw.
When 6, thin wide material is produced, single raising speed should not surpass 10mpm.Raising speed interval should be greater than 10 seconds.Single reduction of speed should not surpass 30mpm.Each reduction of speed interval should be greater than 20 seconds.In reduction of speed process, in stove, be with steel not sideslip in the situation that, reduce easy wooden dipper tune stove tension force as far as possible.
7, thin wide IF steel is by the annealing of annealing temperature lower limit, heating zone Temperature Setting scope is 815-825 ℃, reduce the bent risk of hot wooden dipper, because IF steel does not have ageing feature, can suitably reduce fast slow cooling section temperature to 620-630 ℃, fast cold temperature is to 340-350 ℃, and overaging temperature can be reduced to 350-360 ℃.
8, produce before thin wide specification, use the hot Crown control system of heating zone, prevent that strip running deviation from causing hot wooden dipper bent.Can open the electrically heated of overaging, reduce the variation of roll shape.
In general, in prior art, heating zone temperature is 840 ℃, and slow cooling section temperature is 660 ℃, and fast cold section of temperature is 420 ℃, and overaging temperature is 420 ℃.In order to prove beneficial effect of the present invention, on August 23rd, 2010, production batch was that plate shape prepared in accordance with the present invention is carried out the detection of plate shape outward appearance with the plate shape that adopts prior art to prepare, detect parameters in the present embodiment is heating zone temperature, slow cooling section temperature, fast cold section of temperature, overaging temperature, examination criteria is twill defect, and concrete detection case is shown in as following table 1.
Table 1 thickness is that 0.7mm, width are 1775mm plate shape synopsis
The tension force in each stage of prior art Zhong Lu district is: heating zone tension force is 6.8-7.5KN, and overaging tension force is 5.5-6.0KN.On August 23rd, 2010, production batch was that plate shape prepared in accordance with the present invention is carried out the detection of plate shape outward appearance with the plate shape that adopts prior art to prepare, detect parameters in the present embodiment is heating zone tension force, overaging tension force, examination criteria is twill defect, and concrete detection case is shown in as following table 2.
Table 2 thickness is that 0.7mm, width are 1775mm plate shape synopsis
Designed capacity 1850mm with interior continuous annealing furnace in, successfully produce thickness and comprise 0.6mm, 0.7mm or 0.8mm.Width comprises 1640mm, 1775mm or 1850mm.Surface quality has reached FC level, has solved Limit specifications IFGang Lu district wooden dipper Qu Wenti, has expanded continuous annealing line product structure.Realized the stable logical plate in thin Kuan Liao IFGang Lu district, the shape wave at bandwidth 1/4th places is basically eliminate also, has significantly improved the annealing strip shape quality with steel.
In prior art, when thin wide limits specification is carried out stove district anneal, belt steel surface longitudinally there will be the surface imperfection such as twill, in the band symmetrical position of steel medullary ray, approximately 250 millimeters of twill length, twill width is 550 millimeters, the convexity structure of twill width and furnace roller is corresponding, main generation reason is under hot conditions, band steel produces hot wooden dipper Qu Xianxiang at furnace roller convexity place under tension force effect, this twill defective effect is to the judgement with steel visual appearance integrated level, once there is twill defect, visual appearance grade decision level is FB, cannot reach the quality scale of automobile exterior panel FC, apply after this logical plate method, effectively reduce wooden dipper Qu Xianxiang, eliminated the twill defect on Limit specifications surface, surface quality measurement rank meets FC, reached the quality grade of automobile exterior panel.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to example, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (3)
1. the logical plate method in the IFGang Lu district of Limit specifications, is characterized in that, the composition of described IF steel by weight percentage ratio comprises: C≤0.0015, Si≤0.03, Mn:0.1-0.14, P≤0.01, S≤0.01, Alt:0.02-0.045, Ti:0.06-0.08, N≤0.004, surplus is: Fe;
The temperature that comprises the steps: each stage of its continuous annealing is: heating zone temperature is 820 ℃, and slow cooling section temperature is 625 ℃, and fast cold section of temperature is 345 ℃, and overaging temperature is 355 ℃;
The tension force in described stove each stage of district is: heating zone tension force is 6KN, and overaging tension force is 5KN.
2. the logical plate method in stove according to claim 1 district, is characterized in that, the Limit specifications thickness of described IF steel comprises 0.6,0.7 or 0.8mm.
3. the logical plate method in stove according to claim 2 district, is characterized in that, the Limit specifications width of described IF steel comprises 1640mm, 1775mm or 1850mm.
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| CN103255277B (en) * | 2013-04-28 | 2015-12-09 | 首钢京唐钢铁联合有限责任公司 | The method of wide thin IF steel is produced in continuous annealing |
| CN103710523A (en) * | 2013-12-20 | 2014-04-09 | 鞍钢股份有限公司 | Method for controlling wrinkle in continuous annealing of wide interstitial-free steel (IF) |
| CN104131152B (en) * | 2014-07-15 | 2016-06-01 | 首钢总公司 | The treatment process of wooden dipper song in a kind of thin wide specification IF steel stove |
| CN105506269B (en) * | 2015-12-18 | 2018-06-26 | 武汉钢铁有限公司 | The anti-deviation method of the phosphorous high-strength steel of continuous annealing unit |
| CN109097553B (en) * | 2018-06-28 | 2020-06-12 | 首钢京唐钢铁联合有限责任公司 | IF steel bulge defect control method |
| CN111334648A (en) * | 2020-03-31 | 2020-06-26 | 鞍钢股份有限公司 | Method for preventing ultrathin IF steel of continuous annealing unit from wrinkling |
| CN111850286A (en) * | 2020-06-15 | 2020-10-30 | 华菱安赛乐米塔尔汽车板有限公司 | Application method for preventing ultra-wide IF steel from being buckled by cold |
| CN112474821B (en) * | 2020-10-29 | 2023-03-21 | 江苏延汉材料科技有限公司 | Method for controlling plate shape of martensitic stainless steel thin strip |
| CN114410898A (en) * | 2022-01-25 | 2022-04-29 | 山东钢铁集团日照有限公司 | Control method for cold buckling of ultra-deep drawing wide-width plate |
| CN115074520B (en) * | 2022-05-20 | 2023-11-14 | 本钢板材股份有限公司 | Method for controlling shape of extremely-thin wide cold-rolled outer plate |
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| CN101597674B (en) * | 2009-07-03 | 2010-09-22 | 首钢总公司 | Continuous annealing method of DC01 steel plate with low yield and high tensile strength for automobiles |
| CN101993988B (en) * | 2009-08-25 | 2012-07-18 | 鞍钢股份有限公司 | Method for producing extreme-thin ultra-deep punching cold-rolled sheet by vertical continuous annealing furnace |
| CN102154586A (en) * | 2011-01-29 | 2011-08-17 | 首钢总公司 | Method for preventing surface of Ti-IF steel from forming crack defects |
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Application publication date: 20121010 Assignee: BEIJING SHOUGANG COLD ROLLING THIN PLATE CO., LTD. Assignor: Capital Iron & Steel General Company Contract record no.: 2015990001019 Denomination of invention: A kind of Limit specifications IFGang Lu district leads to plate method Granted publication date: 20140129 License type: Common License Record date: 20151209 |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |