CN102658301B - Control and modifying unit of scale of hot rolling strip steel - Google Patents
Control and modifying unit of scale of hot rolling strip steel Download PDFInfo
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- CN102658301B CN102658301B CN201210137306.2A CN201210137306A CN102658301B CN 102658301 B CN102658301 B CN 102658301B CN 201210137306 A CN201210137306 A CN 201210137306A CN 102658301 B CN102658301 B CN 102658301B
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- scale
- strip steel
- steel
- cooling
- hot rolling
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Abstract
The invention discloses a control and modifying unit of scale of hot rolling strip steel, comprising an uncoiling mechanism, a spraying and drying device, a withdrawing-straightening device, a heating device, a cooling device, a secondary drying device, a surface passivating and oil-coating device, a winding and pinch roll and a winding machine which are connected in sequence by roller ways, wherein a blowing device is arranged between the withdrawing-straightening device and the heating device; and the winding machine is provided with an edge anti-oxidation spraying device and a weakly-alkaline neutralizer spraying device. The control and modifying unit provided by the invention has the advantages that according to different requirements on the scale structures on the surface of the strip steel, the offline strip steel is unwound again by the unwinding mechanism, the temperature of the strip steel is controlled by the heating device, the cooling rate and the cooling temperature of the strip steel are controlled by the cooling device, and then the needed scale structures which are free from acid cleaning and easy for acid cleaning are obtained; in the scale structure which is free from acid cleaning, the content of Fe3O4 is up to more than 80%, in the scale structure which is easy for acid cleaning, the content of FeO can be up to more than 50%, and the scale structures are superior to the scale structure obtained by the traditional scale control process.
Description
Technical field
The present invention relates to hot-strip production field, refer to particularly a kind of hot rolling strip steel scale control and modification unit.
Background technology
At present, domestic steel market competition, product homogeneity is serious, and user is also increasingly harsh to the requirement of hot-strip product.The aspects such as the size of user to product, form accuracy, mechanical property all have higher requirements, along with development and the steel industry " with hot Dai Leng " of modernization industry become trend, user requires also more and more higher to the surface quality of hot-strip product, as the consideration based on the aspect such as cost efficiency and energy-conserving and environment-protective, the performance of user to hot-strip product surface iron scale, as pickling complexity, peel off the aspects such as behavior and there are certain requirements, pickling steel is exempted from hot rolling, and therefore a series of products such as easy pickling steel, hot rolling acid-cleaning coiled sheet are greatly developed by iron and steel producer.
Hot-strip is accompanied by oxidation in whole production process always, and in the time of higher temperature, its scale on surface typical structure is: the Fe that outermost layer is thinner
2o
3layer, middle Fe
3o
4layer and the close thicker FeO layer of matrix side.In the time that hot-strip is batching in the cooling procedure after rolling off the production line that temperature is down to below 570 DEG C, FeO layer, due to thermodynamic instability generation eutectoid reaction, generates α ~ Fe+Fe
3o
4mixture, Fig. 1 is FeO eutectoid reaction schematic diagram.Different structure with steel oxidation iron sheet and composition have larger impact to the performances such as behavior of peeling off in its pickling performance, when distortion.Iron and steel producer generally produces and subtracts pickling steel, exempts from the distinguishing products such as pickling steel to meet the demand of user's Surface Quality and performance by controlling the structure of iron scale.
Grant number is that the Chinese invention patent of CN101856669B discloses " a kind of control method of softness of oxide scales on surface of hot-rolling strip steel ", this scheme has proposed hot rolling technology for different scale structures and has adjusted scheme, and the eutectoid reaction degree of controlling FeO by controlling cooling velocity and coiling temperature finally reaches the reasonable control of scale structure.Application number is that 201110223714.5 Chinese invention patent discloses " a kind of production method that subtracts pickling steel ", propose rationally to utilize TMCP(Thermo Mechanical Control Process: thermomechanical control) technique, comprise that heating, de-scaling, roughing, finish-rolling process, laminar flow are cooling, effective combination of coiling technique, make the structure that final iron scale microstructure On-line Control is easy pickling.These control devices for scale structure are mainly that controlled rolling temperature and mill speed avoid iron sheet fragmentation, reduce thickness of scale, roll rear cooling velocity and coiling temperature is controlled eutectoid reaction process by adjustment.These means are absorbed in and are controlled batching the front technological parameter with steel, there is certain effect, but it is seldom intervened fully to batching the rear cooling procedure with steel, cannot suppress eutectoid reaction and cannot accommodation zone steel cooling rate, therefore have its limitation controlling iron scale phase composition and structure aspects.There are some researches show hot-strip in the time that different coiling temperatures are cooled to room temperature with different cooling speed, its scale on surface will present different structures, as shown in Figure 2.Wherein I class is that a large amount of residual FeO are with some Fe
3o
4precipitate; II class is a large amount of residual FeO and the obvious continuous Fe forming at FeO/ basal body interface
3o
4layer, has a certain amount of Fe at FeO in mutually
3o
4separate out; III class is by Fe
3o
4+ Fe eutectoid thing, Fe
3o
4precipitated phase and a small amount of FeO compositions of mixtures.Eutectoid reaction speed and the degree of cooling procedure after strip coiling on FeO in its iron scale has larger impact, and controlling coiling temperature and subsequent cooldown rate well is to obtain the good key of exempting from pickling scale structure.In addition, while using larger cooling rate cooling, a large amount of FeO will left behind mutually, simultaneously the quick cooling continuous Fe that can suppress the difficult pickling of FeO and basal body interface place
3o
4the formation of layer, finally forms easy pickling scale structure.Therefore, can consider by reasonably intervening batching the rear cooling procedure with steel, thereby realize the control to its scale structure, finally obtain having the belt steel product of required surface property.
In actual production process; the coiling temperature of hot-strip is generally more than 550 DEG C; thereafter cooling procedure is very slow, and current each steel mill is generally to batching the rear intervention means with the cooling employing of steel that to use blower fan to blow cooling, but this method cooling effectiveness is too low.The Chinese patent that grant number is CN2579541Y provides " a kind of forced cooling device for hot rollings teel coil ", and its feature is to adopt cooling water tank, coils of hot-rolled steel is put into water tank cooling, can make coil of strip realize cooling fast, greatly shortens the finishing cycle.The Chinese patent that grant number is CN2579542Y provides " a kind of online forced cooling device of coils of hot-rolled steel ", its feature is a pair of nozzle of the each layout in holder both sides along the online direction of coil conveying chain, force cooling to hot coil of strip with water under high pressure, can make coils of hot-rolled steel realize on-line cooling, thereby shorten the cool time of coil of strip.Above two kinds of forced cooling method cooldown rates have a distinct increment compared with blower fan quenching, but above method is all that coil of strip is cooling with the form of rolling, coils of hot-rolled steel is in the time that rolling is cooling, due to cooling condition difference and the oxygen supply difference of coil of strip different parts, plate wide width portion and middle part iron scale situation are conventionally also not quite identical, cause iron scale skewness in strip width direction, its performance homogeneity is caused to adverse effect, particularly in the time of pickling, easily cause pickling inhomogeneous, cause overpickling.
In addition, hot-rolled finished product twists in storage and transport process and is easily subject to atmospheric corrosion and drenches with rain, the local electrochemistry crevice corrosion that condensation causes and make hot rolled steel plate surface that corrosion or serious " pockmark " corrosion occur, belt steel surface also easily under wet environment with bunch wrap material as straw mattress, there is acid interfacial reaction in straw ropes etc., thereby cause its surface deterioration, exempt from pickling steel coil of strip due to without ball blast, sandblast, the operation straight formings such as pickling, user does not allow its surface to occur the situations such as corrosion, therefore, be necessary, in the time that pickling steel is exempted from production, antirust and acid-base neutralization processing is done in its surface.
Summary of the invention
The object of the invention is to provide a kind of comprehensive scale structure control and modification, the surface function such as antirust in the unit of one, hot-strip to be processed, production has the hot-rolled strip steel winding of required scale structure, excellent surface properties and quality, this unit is by the band steel uncoiling processing again of just having rolled off the production line, can make the cooling condition of coil of strip different parts become controlled and eliminate the oxygen supply difference of coil of strip different parts, the final iron scale forming along strip width directional performance and structure homogeneous.
For realizing this object, the hot rolling strip steel scale control that the present invention is designed and modification unit, comprise the uncoiling mechanism, winding-up drying device, straightening device, heater, cooling device, redrying device, surface passivation and oiling station, coiling clamp roller and the coiling machine that connect successively by roller-way, wherein, between described straightening device and heater, be provided with blow device, described coiling machine is provided with limit portion anti-oxidation spraying device and alkalescent nertralizer spray equipment.
Further, import and the exit position of described heater are equipped with temperature measurer, and the exit position of described cooling device is also provided with temperature measurer.
Further, described heater is heat radiation heater or induction heating apparatus.
Further, described cooling device is equipment water jetting cooler or water-air atomizing cooling device.
Further, described uncoiling mechanism comprises the uncoiler and the uncoiling pinch roll that connect successively by roller-way.
Beneficial effect of the present invention is:
(1) unit provided by the invention is according to the different requirements to belt steel surface scale structure, by uncoiling mechanism by the band steel uncoiling again of just having rolled off the production line, by heater control belt steel temperature, by cooling device control band steel cooldown rate and chilling temperature, obtain required pickling, the easy pickling scale structure of exempting from, exempt from Fe in pickling scale structure
3o
4content reaches more than 80%, and easily in pickling scale structure, FeO can reach more than 50%, is better than the iron sheet structure obtaining by conventional oxidation iron sheet control technique.
(2) unit provided by the invention is by the band steel uncoiling processing again of just having rolled off the production line, can make the cooling condition of coil of strip different parts become controlled and eliminate the oxygen supply difference of coil of strip different parts, the final iron scale forming along strip width directional performance and structure homogeneous.
(3) what unit provided by the invention can be according to effects on surface performance requires the functions such as choose reasonable is dry, cooling, scale breading, oiling, passivation, can be used as supplementing of traditional scale structure control technique, the scope of application is wider, can carry out the production of many steel grades, many specifications, multiple scale structure band steel, production has good surface property with steel, and band steel mechanical property is had no adverse effect.
Brief description of the drawings
Fig. 1 is the FeO eutectoid reaction schematic diagram the present invention relates to.
Fig. 2 is the schematic diagram that the control coiling temperature that the present invention relates to and cooling rate obtain different scale structures.
Fig. 3 is the structural representation of hot rolling strip steel scale control of the present invention and modification unit.
Wherein, 1-uncoiler, 2a-uncoiling pinch roll, 2b-coiling clamp roller, 3a-winding-up drying device, 3b-redrying device, 4-straightening device, 5-blow device, 6-temperature measurer, 7-heater, 8-cooling device, 9-surface passivation and oiling station, 10-limit portion anti-oxidation spraying device, 11-coiling machine, 12-alkalescent nertralizer spray equipment.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Shown in the eutectoid reaction schematic diagram of FeO shown in Fig. 1 and Fig. 2, control the schematic diagram that coiling temperature and cooling rate obtain different scale structures and in background technology, have been introduced, repeat no more in this.
Hot rolling strip steel scale control as shown in Figure 3 and modification unit, comprise the uncoiling mechanism, winding-up drying device 3a, straightening device 4, heater 7, cooling device 8, redrying device 3b, surface passivation and oiling station 9, coiling clamp roller 2b and the coiling machine 11 that connect successively by roller-way, wherein, between described straightening device 4 and heater 7, be provided with blow device 5, coiling machine 11 is provided with limit portion anti-oxidation spraying device 10 and alkalescent nertralizer spray equipment 12.
In technique scheme, straightening device 4 carries out scale breading, smooth processing for the band steel to just having rolled off the production line.Above-mentioned blow device 5 is for the iron scale to broken on steel, and foreign material clean processing.Above-mentioned redrying device 3b is used for being dried processing with the cooled cooling medium that remains in belt steel surface of steel.Above-mentioned surface passivation and oiling station 9 can freely be selected as required surface passivation or be coated with functional oil, and passivation adopts spraying passivating solution method, antirust oil to adopt roll-type oiling mode, and the antirust oil adopting need possess resistance to 400 ~ 550 DEG C of high-temperature behaviors.Above-mentioned limit portion anti-oxidation spraying device 10 in the time of strip coiling at the anti-oxidation glass dust of its end face spraying one deck, thereby glass dust at high temperature can melt sealing gap between steel coil end-face steel edge portion, finally reduces the oxidation of limit portion.Above-mentioned alkalescent nertralizer spray equipment 12 sprays one deck alkalescent nertralizer as Na at band steel coil of strip outermost surface
2cO
3deng to reduce the interfacial reaction between belt steel surface and bunch wrap material under wet environment.
In technique scheme, the import of heater 7 and exit position are equipped with temperature measurer 6, and the exit position of cooling device is also provided with temperature measurer 6.
In technique scheme, heater 7 is heat radiation heater or induction heating apparatus.This heater need have gas tightness and heating process at N
2under protective atmosphere, carry out, the rate of heat addition is 5 ~ 30 DEG C/s.
In technique scheme, cooling device 8 is equipment water jetting cooler or water-air atomizing cooling device.This cooling device 8 is specially cooling manifold and the nozzle that some distributes up and down, and cooldown rate can be 50 ~ 100 DEG C/s, and realizes the adjusting of cooling rate by the switching of cooling manifold, cooling evenly along strip width direction.
In technique scheme, uncoiling mechanism comprises the uncoiler 1 and the uncoiling pinch roll 2a that connect successively by roller-way.
Hot rolling strip steel scale control of the present invention and modification unit can be produced according to demand easy pickling SPHC steel or exempt from pickling 510L steel, and explanation utilizes the present invention to produce the method for above-mentioned two kinds of steel respectively below:
Utilize this hot rolling strip steel scale control and modification unit to produce easy pickling SPHC steel, its key step is as follows: the SPHC coil of strip just having rolled off the production line, 600 DEG C of left and right of temperature, in use uncoiling mechanism, uncoiler 1 is by its uncoiling, utilize straightening device 4, use larger tension force and bending force by its scale breading, then use blowing device 5 to purge iron scale, use temperature measurer 6 to carry out thermometric to band steel, to reach the required cooling rate instruction of target temperature by feedback device and be passed to cooling device 8, make cooling device, with the speed of 80 DEG C/s, band steel is cooled to 200 DEG C of left and right by the collector of some in open cold radiator cooler 8, again by redrying device 3b to being dried processing with the cooled cooling medium that remains in belt steel surface of steel, then by coiling machine 11 by strip coiling, so far, easily pickling SPHC steel has been produced, easily heater 7 in the production process of pickling SPHC steel, surface passivation and oiling station 9, limit portion anti-oxidation spraying device 10 and alkalescent nertralizer spray equipment 12 are closed condition, band steel is directly through said apparatus.In above-mentioned easy pickling SPHC steel, scale structure FeO content can reach more than 50%, and iron scale thickness can be controlled in 10 μ m, and even along strip width direction scale structure and performance.
Utilize this hot rolling strip steel scale control and modification unit to produce and exempt from pickling 510L steel, its key step is as follows: the 510L coil of strip rolling off the production line, 500 DEG C of left and right of temperature, in use uncoiling mechanism, uncoiler 1 is by its uncoiling, utilize straightening device 4, use less tension force and bending force that it is smooth, use blowing device 5 to purge surface porosity iron scale; Use temperature measurer 6 to carry out thermometric to band steel, to reach the required heating instruction of target temperature by feedback device and be passed to heater 7, utilize induction heating apparatus, with the speed of 10 DEG C/s, band steel is heated to 540 DEG C of left and right, temperature drop when compensating uncoiling and increase the walking the time of eutectoid reaction district, obtain more eutectoid structure with steel; Then use surface passivation and oiling station 9 that belt steel surface is smeared to one deck thermostable rustproof oil, after this, by coiling machine 11 by strip coiling, in batching, use limit portion anti-oxidation spraying device 10 at the anti-oxidation glass dust of band steel steel coil end-face spraying one deck, use the outmost turns surface spraying alkalescent nertralizer Na of alkalescent nertralizer spray equipment 12 at coil of strip
2cO
3, so far, exempt from pickling 510L steel and produced, exempting from cooling device 8 and redrying device 3b in pickling 510L steel production process is closed condition, band steel is directly through said apparatus.The above-mentioned Fe that exempts from scale structure in pickling 510L steel
3o
4content can reach more than 80%, and thickness of scale can be controlled in 10 μ m, and even along strip width direction scale structure and performance.
Claims (4)
1. a hot rolling strip steel scale control and modification unit, it is characterized in that: it comprises the uncoiling mechanism connecting successively by roller-way, winding-up drying device (3a), straightening device (4), heater (7), cooling device (8), redrying device (3b), surface passivation and oiling station (9), coiling clamp roller (2b) and coiling machine (11), wherein, between described straightening device (4) and heater (7), be provided with blow device (5), described coiling machine (11) is provided with limit portion anti-oxidation spraying device (10) and alkalescent nertralizer spray equipment (12), the import of described heater (7) and exit position are equipped with temperature measurer (6), the exit position of described cooling device (8) is also provided with temperature measurer (6).
2. hot rolling strip steel scale control according to claim 1 and modification unit, is characterized in that: described heater (7) is heat radiation heater or induction heating apparatus.
3. hot rolling strip steel scale control according to claim 1 and modification unit, is characterized in that: described cooling device (8) is equipment water jetting cooler or water-air atomizing cooling device.
4. hot rolling strip steel scale control according to claim 1 and modification unit, is characterized in that: described uncoiling mechanism comprises the uncoiler (1) and the uncoiling pinch roll (2a) that connect successively by roller-way.
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| CN201210137306.2A CN102658301B (en) | 2012-05-04 | 2012-05-04 | Control and modifying unit of scale of hot rolling strip steel |
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| CN201210137306.2A CN102658301B (en) | 2012-05-04 | 2012-05-04 | Control and modifying unit of scale of hot rolling strip steel |
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| CN102658301A CN102658301A (en) | 2012-09-12 |
| CN102658301B true CN102658301B (en) | 2014-11-12 |
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| CN103920737B (en) * | 2014-03-27 | 2016-06-01 | 中冶南方工程技术有限公司 | The belt steel surface oxide compound removing method of a kind of carbon steel |
| CN104005017A (en) * | 2014-05-23 | 2014-08-27 | 安徽永杰铜业有限公司 | Copper strip surface passivation device |
| JP6008066B2 (en) * | 2014-10-08 | 2016-10-19 | 新日鐵住金株式会社 | Heat-treated steel product having high strength and excellent chemical conversion treatment and method for producing the same |
| CN104451496B (en) * | 2014-12-31 | 2017-05-03 | 夏征 | Steel coating device and production method thereof |
| CN111015108B (en) * | 2019-12-19 | 2021-11-02 | 北京首钢股份有限公司 | Method for controlling surface defects of pickled plate |
| CN110961466B (en) * | 2019-12-19 | 2021-05-28 | 北京首钢股份有限公司 | Production method of interstitial-free steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH1025522A (en) * | 1996-07-11 | 1998-01-27 | Nippon Steel Corp | Method for electrically heating metallic strip and apparatus thereof |
| KR100496607B1 (en) * | 2000-12-27 | 2005-06-22 | 주식회사 포스코 | Method And Device For Manufacturing A Hot Rolled Steel Strip |
| JP3823736B2 (en) * | 2001-02-06 | 2006-09-20 | Ｊｆｅスチール株式会社 | Steel plate processing equipment and steel plate manufacturing method |
| JP2003320410A (en) * | 2002-04-30 | 2003-11-11 | Hitachi Cable Ltd | Cleaning device of rolling mill |
| CN1322942C (en) * | 2004-01-12 | 2007-06-27 | 鞍钢股份有限公司 | Band-steel laminar-flow cooling device and its cooling control method |
| CN100431726C (en) * | 2006-12-22 | 2008-11-12 | 江苏沙钢集团有限公司 | Strip steel reeling temperature controlling method and device |
| KR101053414B1 (en) * | 2008-07-04 | 2011-08-01 | 주식회사 포스코 | Descaling method and removal equipment of hot rolled steel strip |
| CN101745551B (en) * | 2008-12-11 | 2011-11-23 | 宝山钢铁股份有限公司 | Free cooling method of hot rolling band steel |
| CN102205350A (en) * | 2011-01-22 | 2011-10-05 | 马鞍山钢铁股份有限公司 | Device and method for removing scale skin of hot rolled steel plate for cold rolling |
| CN102266868B (en) * | 2011-08-05 | 2013-06-19 | 河北钢铁股份有限公司邯郸分公司 | Production method for pickling steel with reduced acid |
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Effective date of registration: 20170711 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuchang, Hubei Friendship Road, No. A, block, floor 999, 15 Patentee before: Wuhan Iron & Steel (Group) Corp. |
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Granted publication date: 20141112 Termination date: 20190504 |