CN102719742A - Limit-specification IF steel and furnace zone through plate method thereof - Google Patents
Limit-specification IF steel and furnace zone through plate method thereof Download PDFInfo
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- CN102719742A CN102719742A CN2012102050307A CN201210205030A CN102719742A CN 102719742 A CN102719742 A CN 102719742A CN 2012102050307 A CN2012102050307 A CN 2012102050307A CN 201210205030 A CN201210205030 A CN 201210205030A CN 102719742 A CN102719742 A CN 102719742A
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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 the logical plate method in a kind of limit specification IF steel and stove district thereof.
Background technology
The IF steel, promptly gapless atomic steel is also claimed ultra low-carbon steel sometimes, has extremely excellent deep drawability, elongation and r value can reach more than 50% and 2.0 now, on automotive industry, have obtained widespread use.In the IF steel; Because C, N content are low; Adding a certain amount of titanium (Ti), niobium strong carboritride forming elements such as (Nb); Interstitial atoms such as the carbon in the ultra low-carbon steel, nitrogen are completely fixed are carboritride, thereby the clean ferritic steel of the gap-free atom that obtains is the Ultra-low carbon gapless atomic steel.
The main thickness range of auto sheet is 0.7～1.2mm, and width range is 1400～1800mm, is main with the EDDQ/SEDDQ-IF steel plate; The principal feature of auto sheet is carbon content low (C≤0.002%), has good deep drawability, still; It is bent that the high temperature wooden dipper very easily takes place in stove the IF steel of thin wide specification, can't the company of realization move back unit high speed, efficient, high-quality production, bent if serious wooden dipper has taken place in stove thin wide specification auto sheet; The blow-on major disaster that possibly finally cause stopping is handled stove district wooden dipper about bent 20 hours accident times spent, has not only had a strong impact on rhythm of production; The quantity scrapped that produces is considerable; Band steel specification is the thin wide specification auto sheet of 0.71*1770mm when coming out of the stove, and there is slight wooden dipper Qu Xianxiang at wide 1/4th places at plate, and its strip shape quality can't satisfy client's demand.Therefore, the logical plate in thin wide specification stove district is all continuous annealing unit problem demanding prompt solutions with improving annealed sheet shape, is the production bottleneck of 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 specification IF steel and logical plate method thereof of improving.
A kind of limit specification IF steel, its composition percentage ratio by weight 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 stove district of limit specification IF steel leads to the plate method; The temperature that comprises the steps: each stage of its continuous annealing is: the heating zone temperature is 815-825 ℃; The slow cooling section temperature is 620-630 ℃, and fast cold section temperature is 340-350 ℃, and the overaging temperature is 350-360 ℃.
Further, the temperature in said each stage of continuous annealing is: the heating zone temperature is 820 ℃, and the slow cooling section temperature is 625 ℃, and fast cold section temperature is 345 ℃, and the overaging temperature is 355 ℃.
Further, the tension force in said 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 said stove each stage of district is: heating zone tension force is 6KN, and overaging tension force is 5KN.
Further, the limit gauge thickness of said IF steel comprises 0.6mm, 0.7mm or 0.8mm.
Further, the limit specification width of said IF steel comprises 1640mm, 1775mm or 1850mm.
A kind of limit specification IF steel provided by the invention and stove district thereof lead to the plate method; Through optimizing stove district tension force, reduce stove district temperature, reduce the body of roll temperature difference, preventing method such as strip running deviation; Not only realized the stable logical plate in thin wide specification automobile slab furnace district; Also significantly improve the annealing strip shape quality, solved the stove district wooden dipper Qu Wenti of limit specification IF steel, expanded the continuous annealing line product structure.
Description of drawings
Fig. 1 is the plate shape synoptic diagram of the logical plate method preparation in the stove district of limit specification IF steel in the prior art;
Fig. 2 leads to the plate shape synoptic diagram of plate method preparation for the stove district of a kind of limit specification IF steel that the embodiment of the invention provides.
Embodiment
The invention provides a kind of logical plate method in stove district of limit specification IF steel, its composition percentage ratio by weight 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.
Through carrying out following concrete operations main points:
1, at first confirms the production program.Thin wide material annealing temperature, thickness, the transition of width should be as far as possible little.The row of concentrating produces and produces thin wide specification auto sheet as far as possible, does not cause producing under the unsettled situation of the working of a furnace thin wide material at continuous transition.
2, before thin wide material advances stove, should shift to an earlier date roll change to wide transit time, when working roll is chrome plating coating, can shift to an earlier date 20 kilometers roll changes, create the stable working of a furnace and guarantee producing of thin wide material along steady by narrow.
3, before thin wide material advanced stove, 5 volumes switched to manual setting master mode with heating mode in advance, prevented the fluctuation up and down of annealing temperature down of control automatically.
When 4, thin wide material was produced, band steel unit did not reduce each section of stove tension force under the prerequisite of sideslip as far as possible in guaranteeing stove.It is 5.5-6.5KN that the heating zone tension range is set, and it is 4.6-5.2KN that the overaging tension range is set, and notes observing bellows and wipes scuffing, bellows distance setting 70-80mm.
When 5, thin wide material was produced, temperature, tension force must shift to an earlier date one at least and lick and crossed, and settle out; During specifications vary, use the speed setting annealing temperature, must guard against frequent adjustment in the heating outlet; Adjustment is preferably in more than 10 seconds at interval, and the maximum coil of strip of flakiness ratio enters the stokehold, and various more parameters are stable; The band steel is just smooth more, otherwise transfers random more more.Note observing the furnace temperature difference and the band temperature difference of each section, should control in the reasonable scope, prevent that the wooden dipper curly hair is living.
When 6, thin wide material was produced, the single raising speed should not surpass 10mpm.Raising speed at interval should be greater than 10 seconds.The single reduction of speed should not surpass 30mpm.Each reduction of speed at interval should be greater than 20 seconds.In the reduction of speed process, the band steel under the situation of sideslip, does not reduce as far as possible and is prone to wooden dipper tune stove tension force in stove.
7, thin wide IF steel is by the annealing of annealing temperature lower limit; Heating zone temperature setting range is 815-825 ℃; Reduce the bent risk of hot wooden dipper,, can suitably reduce fast slow cooling section temperature to 620-630 ℃ because the IF steel does not have ageing characteristics; Fast cold temperature is to 340-350 ℃, and the overaging temperature can be reduced to 350-360 ℃.
8, before the thin wide specification of production, use the hot convexity 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, the heating zone temperature is 840 ℃ in the prior art, and the slow cooling section temperature is 660 ℃, and fast cold section temperature is 420 ℃, and the 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 of adopting prior art for preparing; Detect parameters in the present embodiment is heating zone temperature, slow cooling section temperature, fast cold section temperature, overaging temperature; Examination criteria is the twill defective, and concrete detection case is seen like following table 1.
Table 1 thickness is that 0.7mm, width are 1775mm plate shape synopsis
The tension force in each stage of stove district is in the prior art: 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 of adopting prior art for preparing; Detect parameters in the present embodiment is heating zone tension force, overaging tension force; Examination criteria is the twill defective, and concrete detection case is seen like 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 the FC level, has solved the stove district wooden dipper Qu Wenti of limit specification IF steel, has expanded the continuous annealing line product structure.Realized the stable logical plate in stove district of thin wide material IF steel, the shape wave at bandwidth 1/4th places is basically eliminate also, has significantly improved the annealing strip shape quality of band steel.
In the prior art, when thin wide limits specification was carried out stove district anneal, surface imperfection such as twill vertically can appear in belt steel surface; In band steel medullary ray left-right symmetric position, about 250 millimeters of twill length, the twill width is 550 millimeters; The convexity structure of twill width and furnace roller is corresponding, and mainly producing reason is under hot conditions, and the band steel produces hot wooden dipper Qu Xianxiang at furnace roller convexity place under the tension force effect; This twill defective effect is to the judgement of band steel visual appearance integrated level, in case the twill defective occurs, visual appearance grade decision level is FB; Can't reach the quality scale of automobile exterior panel FC, use this logical plate method after, effectively reduce wooden dipper Qu Xianxiang; Eliminated the twill defective on limit specification surface, the surface quality decision level meets FC, has 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 with reference to instance the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention; And not breaking away from the spirit and the scope of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (7)
1. the IF steel of a limit specification is characterized in that, the composition of described IF steel percentage ratio by weight 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.
2. the stove district of IF steel according to claim 1 leads to the plate method; It is characterized in that; The temperature that comprises the steps: each stage of its continuous annealing is: the heating zone temperature is 815-825 ℃; The slow cooling section temperature is 620-630 ℃, and fast cold section temperature is 340-350 ℃, and the overaging temperature is 350-360 ℃.
3. stove according to claim 2 district leads to the plate method, it is characterized in that the temperature in said each stage of continuous annealing is: the heating zone temperature is 820 ℃, and the slow cooling section temperature is 625 ℃, and fast cold section temperature is 345 ℃, and the overaging temperature is 355 ℃.
4. stove according to claim 2 district leads to the plate method, it is characterized in that, the tension force in said stove each stage of district is: heating zone tension force is 5.5-6.5KN, and overaging tension force is 4.6-5.2KN.
5. stove according to claim 4 district leads to the plate method, it is characterized in that, the tension force in said stove each stage of district is: heating zone tension force is 6KN, and overaging tension force is 5KN.
6. stove according to claim 2 district leads to the plate method, it is characterized in that, the limit gauge thickness of said IF steel comprises 0.6,0.7 or 0.8mm.
7. stove according to claim 6 district leads to the plate method, it is characterized in that, the limit specification width of said IF steel comprises 1640mm, 1775mm or 850mm.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103255277A (en) * | 2013-04-28 | 2013-08-21 | 首钢京唐钢铁联合有限责任公司 | Method for producing wide and thin IF steel by continuous annealing |
| CN103710523A (en) * | 2013-12-20 | 2014-04-09 | 鞍钢股份有限公司 | Method for controlling continuous annealing and wrinkling of wide IF steel |
| CN104131152A (en) * | 2014-07-15 | 2014-11-05 | 首钢总公司 | Buckling treatment method of thin and wide specification IF steel in furnace |
| CN105506269A (en) * | 2015-12-18 | 2016-04-20 | 武汉钢铁(集团)公司 | Continuous annealing unit phosphorus-containing high-strength steel anti-deviation method |
| CN109097553A (en) * | 2018-06-28 | 2018-12-28 | 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 |
| CN112474821A (en) * | 2020-10-29 | 2021-03-12 | 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 |
| CN115074520A (en) * | 2022-05-20 | 2022-09-20 | 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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| CN101597674A (en) * | 2009-07-03 | 2009-12-09 | 首钢总公司 | A kind of continuous annealing method of DC 01 steel plate with low yield and high tensile strength for automobiles |
| CN101993988A (en) * | 2009-08-25 | 2011-03-30 | 鞍钢股份有限公司 | Method for producing ultrathin ultra-deep stamping cold-rolled sheet by vertical continuous annealing furnace |
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| CN101597674A (en) * | 2009-07-03 | 2009-12-09 | 首钢总公司 | A kind of continuous annealing method of DC 01 steel plate with low yield and high tensile strength for automobiles |
| CN101993988A (en) * | 2009-08-25 | 2011-03-30 | 鞍钢股份有限公司 | Method for producing ultrathin ultra-deep stamping cold-rolled sheet by vertical continuous annealing furnace |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103255277A (en) * | 2013-04-28 | 2013-08-21 | 首钢京唐钢铁联合有限责任公司 | Method for producing wide and thin IF steel by continuous annealing |
| CN103255277B (en) * | 2013-04-28 | 2015-12-09 | 首钢京唐钢铁联合有限责任公司 | Method for producing wide and thin IF steel by continuous annealing |
| CN103710523A (en) * | 2013-12-20 | 2014-04-09 | 鞍钢股份有限公司 | Method for controlling continuous annealing and wrinkling of wide IF steel |
| CN104131152A (en) * | 2014-07-15 | 2014-11-05 | 首钢总公司 | Buckling treatment method of thin and wide specification IF steel in furnace |
| CN105506269A (en) * | 2015-12-18 | 2016-04-20 | 武汉钢铁(集团)公司 | Continuous annealing unit phosphorus-containing high-strength steel anti-deviation method |
| 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 |
| CN109097553A (en) * | 2018-06-28 | 2018-12-28 | 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 |
| CN112474821A (en) * | 2020-10-29 | 2021-03-12 | 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 |
| CN115074520A (en) * | 2022-05-20 | 2022-09-20 | 本钢板材股份有限公司 | Method for controlling shape of extremely-thin wide cold-rolled outer 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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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 |
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