CN102069092B - Method for producing hot-rolled strip steel with thickness of 0.6-0.8 mm - Google Patents
Method for producing hot-rolled strip steel with thickness of 0.6-0.8 mm Download PDFInfo
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- CN102069092B CN102069092B CN2010105279446A CN201010527944A CN102069092B CN 102069092 B CN102069092 B CN 102069092B CN 2010105279446 A CN2010105279446 A CN 2010105279446A CN 201010527944 A CN201010527944 A CN 201010527944A CN 102069092 B CN102069092 B CN 102069092B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 86
- 239000010959 steel Substances 0.000 title claims abstract description 86
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000005096 rolling process Methods 0.000 claims abstract description 71
- 238000009749 continuous casting Methods 0.000 claims abstract description 64
- 238000002791 soaking Methods 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000007670 refining Methods 0.000 claims abstract description 15
- 238000005266 casting Methods 0.000 claims abstract description 9
- 238000004804 winding Methods 0.000 claims description 23
- 238000001816 cooling Methods 0.000 claims description 6
- 230000001050 lubricating effect Effects 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 abstract description 24
- 238000005461 lubrication Methods 0.000 abstract description 12
- 230000007704 transition Effects 0.000 abstract 2
- 102000001999 Transcription Factor Pit-1 Human genes 0.000 description 15
- 108010040742 Transcription Factor Pit-1 Proteins 0.000 description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- 229910052742 iron Inorganic materials 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 238000007664 blowing Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 241001062472 Stokellia anisodon Species 0.000 description 5
- 235000019628 coolness Nutrition 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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Abstract
The invention discloses a method for producing hot-rolled strip steel with the thickness of 0.6-0.8 mm, which adopts an advanced semi-endless rolling technology. And (3) refining the qualified molten steel of the converter in LF, and then casting the refined molten steel into a continuous casting blank with the length of 60-240 m, the thickness of 50-60 mm and the width of 1000-1350 mm by using a continuous casting machine, wherein the continuous casting speed is 3.5-6.0 m/min. And directly feeding the continuous casting billet into a roller-hearth soaking furnace at 1100-1180 ℃, wherein the soaking time of the tail part of the continuous casting billet is more than 15 min. And descaling the soaked continuous casting blank, and then feeding the continuous casting blank into a finishing continuous rolling unit for dynamic variable-specification multi-segmentation rolling with or without the cooperation of roll gap lubrication of a working roll, wherein the outlet thickness of a first coil F7 for threading is 1.0-1.1 mm, the thickness of a transition section between two adjacent coils is less than 0.2mm, and the specification changing time of the transition section is more than or equal to 2 seconds. And the strip steel with the thickness less than 0.8mm is cooled by a laminar flow cooler, cut by a flying shear and coiled into a coil by a coiling machine. The strip steel product produced by the method has stable structure performance, high plate shape precision, good surface quality, short production flow, stability, smoothness and high efficiency, and the outline range of the product is expanded.
Description
Technical field
The present invention relates to a kind of employing half technology without a head, to produce thickness be the method for 0.6～0.8mm hot-strip, belongs to metal rolling immediately technological category after direct casting.
Background technology
Continuous casting and rolling technique of sheet bar is through for many years production practices, along with technology can not be perfect, the steel grade of being produced has on the one hand had great expansion; Can produce ultra-thin products on the other hand; Realization is cold and become an important development trend of continuous casting and rolling technique of sheet bar with heat generation, and milling train was worn the deficiency that band is nipped when especially semi-endless rolled technology can overcome the rolling ultra-thin products of single base, can improve lumber recovery; Can improve strip quality again, advantage is quite obvious.CSP becomes countries in the world steel industry further investigation and new technology on probation if adopt semi-endless rolled technology will on product specification, fill up the vacancy in the ultra-thin wide flat steel of hot rolling field.
Research was arranged though at present the Hoogovens company of the Thyssenkrupp company of Germany and Holland produces at CSP aspect the ultra-thin specification band steel; But its debugging progress of application situation and associated core technology contents still are in the secret stage; Do not see any report; As for domestic as Tangshan Iron and Steel Co and Benxi Iron and Steel Company etc. all double Endless Rolling Technology carried out research in various degree; But they carried out semi-endless rolled debugging work, did not produce the ultra-thin products of its thickness less than 0.8mm, did not form mass production capabilities or scale.
Produce the prior art of ultra-thin products for adopting continuous casting and rolling technique of sheet bar; Granted publication number " a kind of method of sheet billet continuously casting and rolling to produce thin strip steel coil " for CN100540165C arranged; It is disclosed be in a kind of CSP of employing production line reasonable technology layout and technological parameter control accurately to produce thickness be that 1.2～1.5mm and width are mild steel, low-alloy steel and the IF steel strip steel coil of strip of 900～1300mm, (production technology like thickness≤1.0mm) is also not mentioned for thin slab product more; In addition, Granted publication number provides the problem that solves rolling thin size hot-rolled band steel for CN100335187C " making the method and the production line of ultrathin hot rolled band based on the thin plate technology " from the angle of continuous casting and rolling.
In recent years; It is CN101293259A " adopting half technology without a head to produce the method that becomes format/constant format ultra-thin hot-rolled strip steel " that publication number is arranged; Disclosed is that rolling thickness is that 0.8～1.8mm, width are the ultra-thin hot-rolled strip steel of 1229～1265mm, does not also report less than the production method or the milling method (rolling mill practice) of the ultra-thin hot-rolled strip steel of 0.8mm as for thickness.
Summary of the invention
The object of the present invention is to provide a kind of can expand product mix scope, product with hot Dai Leng, reduce and wear band and whipping number of times, reduce roll loss, raising or stabilized zone steel logical volume performance and improve the method for production 0.6～0.8mm hot-strip of hot-strip productivity ratio.
For realizing above-mentioned purpose; The technical scheme that the present invention adopts is: the method for said a kind of production 0.6～0.8mm hot-strip is that to utilize FGC dynamic variable specification rolling mill practice advanced in the semi-endless rolled technology to produce thickness be that 0.6～0.8mm, width are the method for the hot-strip of 1000～1350mm
Said 0.6～0.8mm hot-strip can be referred to as ultra-thin hot-rolled strip steel.Its processing step is: with the blast-melted nominal capacity of pouring into is to carry out routine in 100 tons the oxygen top bottom blowing converter to smelt, deslagging tapping when endpoint molten steel composition and temperature reach requirement in the converter, and the molten steel of will coming out of the stove send LF refining.Sending the conticaster continuous casting to become length molten steel after refining is that 60～240m and thickness are the continuous casting billet of 50～60mm, and the casting speed of control conticaster is 3.5～6.0m/min.The high temperature continuous casting billet is directly got into soaking in the roller-bottom type soaking pit, and the temperature in the roller-bottom type soaking pit is controlled at 1100～1180 ℃ of scopes, and the soaking time of every continuous casting billet afterbody is greater than 15min.After the descaling mill de-scaling, send into the finishing tandem rolling unit that constitutes by seven frames by the continuous casting billet after the soaking of roller-bottom type soaking pit and be rolled, adopt all three to all change specification rolling modes of five when rolling.The first winding steel that when continuous casting billet is rolling, is used to wear band is 1.0～1.1mm through the thickness that the 7th frame rolls out; Changeover portion thickness between adjacent two volumes is less than 0.2mm; The changeover portion change specification time is 2～6 seconds, and continuous casting billet becomes the specification number of times greater than 2 times in the operation of rolling of finishing tandem rolling unit (4).
Continuous casting billet is in the operation of rolling of finishing tandem rolling unit; The working roll roll gap of not lubricated first frame and the 7th frame; The working roll roll gap of only lubricated second frame, the 3rd frame, the 4th frame, the 5th frame and the 6th frame, perhaps not lubricated from the working roll roll gap of first frame to the, seven frames.But the first winding steel toe 0～20m of the portion section when every continuous casting billet rolled band steel does not adopt lubricating process to the working roll roll gap with last winding steel afterbody 0～20m section.
The thickness that is rolled out by the finishing tandem rolling unit is gone into flying shear less than the band steel of 0.8mm after by the cooling of laminar flow cooler and is sheared, and the blade clearance control of said flying shear is at 0.10～0.15mm.Band steel first after flying shear is sheared is involved in the first volume and gets the machine or second coiling machine; Second is involved in second coiling machine or first coiling machine; The 3rd is involved in first coiling machine or second coiling machine, and second coiling machine or first coiling machine are gone in the Volume Four, and the 5th is involved in second coiling machine.
The method that adopts a kind of production 0.6～0.8mm hot-strip that as above technical scheme provides compared with prior art, technique effect is:
1. can produce the hot-strip (being the hot rolling coiled sheet) of thickness less than 0.8mm, realize product with hot Dai Leng, this is that continuous casting and rolling technique of sheet bar adopts existing correlation technique to be difficult to realize;
2. in the operation of rolling, wear band and whipping number of times owing to having reduced, the roll loss obviously reduces, and roll improves more than two times service life.
3. wear band and whipping number of times owing to having reduced, saved the time interval, improved productivity ratio.
4. rolling stability and the logical volume of band steel performance have been improved.
5. utilize the existing equipment of CSP production line, practiced thrift equipment investment.
Description of drawings
Fig. 1 is the used capital equipment schematic layout pattern of method of a kind of production 0.6～0.8mm hot-strip of the present invention, also is Figure of abstract of the present invention.
The specific embodiment
Do further to describe in detail below in conjunction with the accompanying drawing specific embodiments of the invention.
As shown in Figure 1,1 is conticaster (two), and 2 is roller-bottom type soaking pit (two), and 3 is descaling mill; 4 is the finishing tandem rolling unit, and 5 is the laminar flow cooler, and 6 is flying shear, and 7 is first coiling machine; 8 is second coiling machine, and wherein descaling mill 3 is called the high-pressure water descaling machine, and flying shear 6 is called high-speed flying shear.
Roller-bottom type soaking pit 2 is installed at the rear portion of conticaster 1; Descaling mill 3 positions are at the tapping hole end of roller-bottom type soaking pit 2; The finishing tandem rolling unit 4 that is made up of seven frame F1～F7 is arranged near descaling mill 3; The port of export at the 7th frame F7 of finishing tandem rolling unit 4 is furnished with laminar flow cooler 5, and flying shear 6 is installed on the production line near laminar flow cooler 5, and the rear end of flying shear 6 is equipped with first coiling machine 7 and second coiling machine 8 respectively.
With the blast-melted nominal capacity of pouring into is to carry out routine in the converter of 100 tons of oxygen top bottom blowings to smelt; The oxygen top bottom blowing converter that also can adopt nominal capacity to be greater than or less than 100 tons is carried out routine and is smelted said blast-melted can be through the desulfurization processing or without the molten iron after the desulfurization processing.When endpoint molten steel composition and temperature in the converter reach tapping deslagging tapping when requiring; The molten steel of will coming out of the stove send LF (liquid steel refining stove) refining; Molten steel after refining is sent into conticaster 1 continuous casting, and to become length be the long continuous casting billet of 60～240m, and wherein said liquid steel refining is a prior art, and conticaster 1 has two; Can two use simultaneously, also can separately use.The casting speed of conticaster 1 is controlled at 3.5～6.0m/min.Adopt the liquid core to depress technology (LCR) control thickness of strand between 50～60mm, length is that the continuous casting billet of 60～240m is referred to as the overlength continuous casting billet.Adopt crystallizer to transfer wide technology (RAM) to guarantee that the continuous casting billet width is 1000～1350mm.Continuous casting billet at high temperature directly gets into soaking in the roller-bottom type soaking pit 2, and the soaking temperature in the roller-bottom type soaking pit 2 is controlled at 1100～1180 ℃.Said roller-bottom type soaking pit 2 is two, can also use simultaneously and can use respectively, and this is an existing equipment on the CSP production line.For guaranteeing the uniformity of continuous casting billet longitudinal temperature, the soaking time of every continuous casting billet afterbody is greater than 15min in the control roller-bottom type soaking pit 2.
Through descaling mill 3 de-scalings, remove the iron scale on continuous casting billet surface by the continuous casting billet after 2 soaking of roller-bottom type soaking pit.Said descaling mill 3 is the high-pressure water descaling machine, and its outlet hydraulic pressure can reach MPa (MPa) level, and this is that descaling mill 3 is own intrinsic.Continuous casting billet after the de-scaling is sent into finishing tandem rolling unit 4 and is rolled, and rolling mode adopts all three to all change specification rolling modes of five.Said finishing tandem rolling unit 4 is the finishing tandem rolling units that are made up of seven frames: first frame is that F1, second frame are that F2, the 3rd frame are that F3, the 4th frame are that F4, the 5th frame are that F5, the 6th frame are that F6 and the 7th frame are F7, prior art.Control the roll-force and the reduction ratio of each frame well.The first winding steel that when continuous casting billet is rolling, is used to wear band is 1.0～1.1mm through the thickness that the 7th frame (weighing up a mouthful frame again) F7 rolls out; Changeover portion thickness is not more than 0.2mm between adjacent two volumes; Through 3～4 change specifications, become the specification system and be (1.0～1.1) mm → (0.9～1.0) mm → (0.8～0.9) mm → (0.68～0.8) mm → 0.7mm, it is (2～6) second that changeover portion becomes the specification time; The changeover portion time that promptly changes to (0.9～1.0) mm by (1.0～1.1) mm is (2～3) second; The changeover portion time that is changed to (0.8～0.9) mm by (0.9～1.0) mm is (2～6) second, and the changeover portion time that is changed to (0.68～0.8) mm by (0.8～0.9) mm is (5～6) second, and the changeover portion time that is changed to 0.7mm by 0.8mm is 5 seconds; And changeover portion thickness is between 0.10～0.12mm, all less than 0.2mm between adjacent two volumes.The change specification number of times of continuous casting billet in the operation of rolling of finishing tandem rolling unit 4 is greater than 2 times.
For improving belt plate shape; Continuous casting billet connects employing working roll roll gap lubrication technology in machine unit 4 operations of rolling in essence, and it is CN101596557A (being ZL200810031458.8) " lubricating device for hot rolled steel strip rolling technology " that the device (or equipment) of realization working roll roll gap lubrication technology can be selected publication number for use.Working roll roller lubricating system is that the first frame F1 (head mounting rack) and the 7th frame (last frame) of finishing tandem rolling unit 4 do not adopt working roll roll gap lubrication technology; And the second frame F2, the 3rd frame F3, the 4th frame F4, the 5th frame F5 and the 6th frame F6 (are that F2～F6) adopts working roll roll gap lubrication technology; Perhaps do not adopt working roll roll gap lubrication technology, but first winding steel toe portion 0～20m section and concluding volume (like Volume Four or five volume) the band steel afterbody 0～20m section of continuous casting billet in the continuous rolling process of finishing tandem rolling unit 4 do not adopt lubricating process to the working roll roll gap from the first frame F1 to the, seven frame F7.
The thickness of being produced by finishing tandem rolling unit 4 is that the band steel of 0.6～0.8mm is gone into flying shear 6 after by 5 coolings of laminar flow cooler and sheared, and said laminar flow cooler 5 is a prior art, and flying shear 6 is a high-speed flying shear.Be to guarantee that the band steel that rolls out is sheared smoothly, at 0.10～0.15mm, the shearing point of band steel determines according to desired volume re-computation with the blade clearance control of flying shear 6.The band steel first volume after flying shear 6 is sheared gets into first coiling machine 7 or second coiling machine 8; Second involves in into second coiling machine 8 or first coiling machine 7, staggered successively batching, and Volume Four or the 5th winding steel are the target thickness volume; Through detecting, thickness deviation is within allowed band.
Embodiment 1
Pour the converter of 100 tons of oxygen top bottom blowings into and carry out routine and smelt blast-melted, the molten steel of coming out of the stove send LF refining, and molten steel send conticaster 1 continuous casting after the refining, and casting speed 4.0m/min adopts the liquid core to depress technical guarantee thickness of strand 56mm, and length is 100m.Continuous casting billet at high temperature directly advances roller-bottom type soaking pit 2, and the soaking temperature in the roller-bottom type soaking pit 2 is 1140 ± 20 ℃, continuous casting billet afterbody soaking time 16min.Continuous casting billet goes out roller-bottom type soaking pit 2 after descaling mill 3 is removed the iron scale on surface, and the continuous casting billet after the de-scaling is sent into finishing tandem rolling unit 4 and is rolled, and rolling mode adopts all change specification rolling modes of four, and finished product thickness is 0.75mm.The continuous casting billet continuous rolling first volume is 1.0mm through the 7th frame F7 exit thickness, through 3 change specifications, becomes the specification system and is 1.0mm → 0.9mm → 0.8mm → 0.75mm; The changeover portion change specification time was followed successively by 2 seconds, 5 seconds and 5 seconds; The change specification time that promptly changes to 0.9mm by 1.0mm is 2 seconds, and the change specification time that is changed to 0.8mm by 0.9mm is 5 seconds, and the change specification time that is changed to 0.75mm by 0.8mm is 3 seconds; Changeover portion thickness between adjacent two volumes is 0.05～0.10mm, all less than 0.2mm.
Adopt working roll roll gap lubrication technology; Its working roll roll gap lubrication mode is that the working roll roll gap of the first frame F1 and the 7th frame F7 is not lubricated; And from the working roll roll gap lubrication of the second frame F2 to the, six frame F6, the continuous rolling first winding steel toe 10m of portion section and Volume Four band steel afterbody 10m section are lubricated.The thickness that is rolled out by finishing tandem rolling unit 4 is that the band steel of 0.75mm is gone into flying shear 6 after by 5 coolings of laminar flow cooler and sheared, and the blade gap of flying shear 6 is 0.15mm, and the band steel first after cutting off involves in the first volume and gets machine 7; Second involves in second coiling machine 8, the three involves in first coiling machine 7, and second coiling machine 8 is advanced in the Volume Four; Wherein the thickness of the first winding steel is 1.0mm, and the thickness of the second winding steel is 0.9mm, and the thickness of the 3rd winding steel is 0.8mm; The thickness of the 4th section strip steel is 0.75mm; And Volume Four band steel is the target thickness volume, and through detecting, thickness deviation is within allowed band.
Embodiment 2
Pour the converter of 100 tons of oxygen top bottom blowings into and carry out routine and smelt blast-melted, the molten steel of coming out of the stove send LF refining, and molten steel send conticaster 1 continuous casting after the refining, and casting speed 4.5m/min adopts the liquid core to depress technical guarantee thickness of strand 56mm, and length is 167m.Continuous casting billet at high temperature directly advances roller-bottom type soaking pit 2, and the soaking temperature in the roller-bottom type soaking pit 2 is 1150 ± 20 ℃, continuous casting billet afterbody soaking time 17min.Continuous casting billet goes out roller-bottom type soaking pit 2 after descaling mill 3 is removed the iron scale on surface, and the continuous casting billet after the de-scaling is sent into finishing tandem rolling unit 4 and is rolled, and rolling mode adopts all change specification rolling modes of five; Finished product thickness is 0.7mm, and the continuous casting billet continuous rolling first volume is 1.1mm through the 7th frame F7 exit thickness, becomes specification through 4 times; Become the specification system and be 1.1mm → 1.0mm → 0.9mm → 0.8mm → 0.7mm; Changeover portion becomes the specification time and was followed successively by 2 seconds, 2 seconds, 5 seconds and 5 seconds, and the change specification time that promptly changes to 1.0mm by 1.1mm is 2 seconds, and the change specification time that is changed to 0.9mm by 1.0mm is 2 seconds; The change specification time that is changed to 0.8mm by 0.9mm is 5 seconds; The change specification time that is changed to 0.7mm by 0.8mm is 5 seconds, and the changeover portion thickness between adjacent two volumes is 0.1mm, all less than 0.2mm.
Adopt working roll roll gap lubrication technology; Its working roll roll gap lubrication mode is that the working roll roll gap of the first frame F1 and the 7th frame F7 is not lubricated; And from the working roll roll gap lubrication of the second frame F2 to the, six frame F6, the continuous rolling first winding steel toe 20m of portion section and the 5th winding steel afterbody 20m section are lubricated.The thickness that is rolled out by finishing tandem rolling unit 4 is that the band steel of 0.7mm is gone into flying shear 6 after by 5 coolings of laminar flow cooler and cut and cut.The blade gap of flying shear 6 is 0.14mm, and the band steel first after cutting off involves in second coiling machine 8, the second and involves in first coiling machine 7, the three and involve in second coiling machine 8, and the Volume Four is advanced first coiling machine 7, the five and involved in second coiling machine 8.Wherein the thickness of the first winding steel is 1.1mm, and the steel thickness of second winding is 1.0mm, and the thickness of the 3rd winding steel is 0.9mm; The Volume Four belt steel thickness is 0.8mm, and the 5th winding steel thickness is 0.7mm, and the 5th winding steel is the target thickness volume; Through detecting, thickness deviation is within allowed band.
Pour the converter of 100 tons of oxygen top bottom blowings into and carry out routine and smelt blast-melted, the molten steel of coming out of the stove send LF refining, and molten steel send conticaster 1 continuous casting after the refining, and casting speed 4.5m/min adopts the liquid core to depress technical guarantee thickness of strand 55mm, and length is 134m.Continuous casting billet at high temperature directly advances roller-bottom type soaking pit 2, and the soaking temperature in the roller-bottom type soaking pit 2 is 1160 ± 20 ℃, continuous casting billet afterbody soaking time 20min.Continuous casting billet goes out roller-bottom type soaking pit 2 after descaling mill 3 is removed the iron scale on surface, and the continuous casting billet after the de-scaling is sent into finishing tandem rolling unit 4 and is rolled, and rolling mode adopts all change specification rolling modes of four; Finished product thickness 0.68mm; The continuous casting billet continuous rolling first volume is 1.0mm through the 7th frame F7 exit thickness, through 3 change specifications, becomes the specification system and is 1.0mm → 0.9mm → 0.8mm → 0.68mm; The changeover portion change specification time was followed successively by 3 seconds, 6 seconds and 6 seconds; The change specification time that promptly changes to 0.9mm by 1.0mm is 3 seconds, and the change specification time that is changed to 0.8mm by 0.9mm is 6 seconds, and the change specification time that is changed to 0.68mm by 0.8mm is 6 seconds; Changeover portion thickness is 0.10～0.12mm between adjacent two volumes, all less than 0.2mm.
Do not adopt lubricating process from the working roll roll gap of the first frame F1 to the, seven frame F7, the thickness that is rolled out by finishing tandem rolling unit 4 is that the band steel of 0.68mm is gone into flying shear 6 after by 5 coolings of laminar flow cooler and cut and cut.The blade gap of flying shear 6 is 0.12mm, and the band steel first after cutting off involves in second coiling machine 8, the second and involves in first coiling machine 7, the three and involve in second coiling machine 8, and first coiling machine 7 is advanced in the Volume Four.Wherein the thickness of the first winding steel is 1.0mm, and the thickness of the second winding steel is 0.9mm, and the thickness of the 3rd winding steel is 0.8mm, and the thickness of Volume Four band steel is 0.68mm, and Volume Four band steel is target thickness volume, and through detecting, thickness deviation is within allowed band.
Claims (4)
1. method of producing 0.6～0.8mm hot-strip; Deslagging tapping when endpoint molten steel composition and temperature reach requirement in the converter; The molten steel of will coming out of the stove send LF refining; It is characterized in that: sending conticaster (1) continuous casting to become length molten steel after refining is that 60～240m and thickness are the continuous casting billet of 50～60mm, and the casting speed of conticaster (1) is 3.5～6.0m/min; It is 1100～1180 ℃ the interior soaking of roller-bottom type soaking pit (2) that continuous casting billet directly gets into temperature, and the soaking time of continuous casting billet afterbody is greater than 15min; After descaling mill (3) de-scaling, sending into the finishing tandem rolling unit (4) that is made up of seven frames by the continuous casting billet after roller-bottom type soaking pit (2) soaking is rolled; The first winding steel that when continuous casting billet is rolling, is used to wear band is 1.0～1.1mm through the thickness that the 7th frame (F7) rolls out; Changeover portion thickness between adjacent two volumes is less than 0.2mm; The changeover portion change specification time is 2～6 seconds, and continuous casting billet becomes the specification number of times greater than 2 times in the operation of rolling of finishing tandem rolling unit (4);
Continuous casting billet is in the operation of rolling of finishing tandem rolling unit (4); The work roll gap of not lubricated first frame (F1) and the 7th frame (F7); The work roll gap of only lubricated second frame (F2), the 3rd frame (F3), the 4th frame (F4), the 5th frame (F5) and the 6th frame (F6), perhaps the work roll gap from first frame (F1) to the 7th frame (F7) is not lubricated;
The thickness that is rolled out by finishing tandem rolling unit (4) is gone into flying shear (6) less than the band steel of 0.8mm after by laminar flow cooler (5) cooling and is sheared; Band steel first after flying shear (6) is sheared is involved in the first volume and gets machine (7) or second coiling machine (8); Second is involved in second coiling machine (8) or first coiling machine (7); The 3rd is involved in first coiling machine (7) or second coiling machine (8), and second coiling machine (8) or first coiling machine (7) are gone in the Volume Four, and the 5th is involved in second coiling machine (8).
2. the method for a kind of production 0.6～0.8mm hot-strip according to claim 1 is characterized in that: the continuous casting billet after the de-scaling is sent into finishing tandem rolling unit (4) and is adopted when rolling all three to all change specification rolling modes of five.
3. the method for a kind of production 0.6～0.8mm hot-strip according to claim 1 is characterized in that: the first winding steel toe 0～20m of the portion section when every continuous casting billet rolled band steel does not adopt lubricating process to the working roll roll gap with last winding steel afterbody 0～20m section.
4. the method for a kind of production 0.6～0.8mm hot-strip according to claim 1 is characterized in that: with the blade clearance control of flying shear (6) at 0.10～0.15mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105279446A CN102069092B (en) | 2010-10-26 | 2010-10-26 | Method for producing hot-rolled strip steel with thickness of 0.6-0.8 mm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105279446A CN102069092B (en) | 2010-10-26 | 2010-10-26 | Method for producing hot-rolled strip steel with thickness of 0.6-0.8 mm |
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| Publication Number | Publication Date |
|---|---|
| CN102069092A CN102069092A (en) | 2011-05-25 |
| CN102069092B true CN102069092B (en) | 2012-07-18 |
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| CN2010105279446A Active CN102069092B (en) | 2010-10-26 | 2010-10-26 | Method for producing hot-rolled strip steel with thickness of 0.6-0.8 mm |
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| CN102703815A (en) * | 2012-06-19 | 2012-10-03 | 东北大学 | 600 MPa-grade hot-rolled dual-phase steel and preparation method thereof |
| CN106269864B (en) * | 2016-08-30 | 2018-03-06 | 江苏省沙钢钢铁研究院有限公司 | Method for improving hot rolling stability of thin container plate |
| CN107617647B (en) * | 2017-09-13 | 2021-01-26 | 武汉钢铁有限公司 | Method for producing hot-rolled strip steel with thickness less than or equal to 1.2mm by continuous casting and rolling of sheet billet |
| CN108838207B (en) * | 2018-07-09 | 2020-09-08 | 秋海滨 | Metal casting and rolling method and equipment |
| CN113477715A (en) * | 2021-07-09 | 2021-10-08 | 首钢智新迁安电磁材料有限公司 | Shearing method for thin strip steel |
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| NL9100911A (en) * | 1991-03-22 | 1992-10-16 | Hoogovens Groep Bv | Mfg. hot-rolled steel strip with single pass - for the sole reduction means through two-high roll stand |
| AT504782B1 (en) * | 2005-11-09 | 2008-08-15 | Siemens Vai Metals Tech Gmbh | METHOD FOR PRODUCING A HOT-ROLLED STEEL STRIP AND COMBINED CASTING AND ROLLING MACHINE TO PERFORM THE METHOD |
| CN100560240C (en) * | 2006-01-20 | 2009-11-18 | 上海梅山钢铁股份有限公司 | A kind of high efficiency continuous casting and continuous rolling process |
| CN101293259A (en) * | 2008-06-12 | 2008-10-29 | 湖南华菱涟源钢铁有限公司 | Method for producing variable-specification/constant-specification ultrathin hot-rolled strip steel by adopting semi-endless technology |
| CN101658860A (en) * | 2008-08-28 | 2010-03-03 | 上海梅山钢铁股份有限公司 | Sheet billet continuous casting and rolling production line |
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Effective date of registration: 20210624 Address after: 417000 Shuangling building, no.1005, Gangui Road, Huangnitang, Louxing District, Loudi City, Hunan Province Patentee after: Hunan Valin Lianyuan Iron & Steel Co., Ltd. Patentee after: Hunan Hualing LIANGANG special new material Co.,Ltd. Patentee after: University OF SCIENCE AND TECHNOLOGY BEIJING Address before: Huangnitang River Road 417009 Hunan city of Loudi province No. 1 Patentee before: Hunan Valin Lianyuan Iron & Steel Co., Ltd. Patentee before: HUNAN HUALING LIANGANG STEEL SHEET Co.,Ltd. Patentee before: University OF SCIENCE AND TECHNOLOGY BEIJING |