CN1883835A - Method for producing coiled sheet by continuous casting and tandem rolling of regular slab - Google Patents
Method for producing coiled sheet by continuous casting and tandem rolling of regular slab Download PDFInfo
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- CN1883835A CN1883835A CN 200510078372 CN200510078372A CN1883835A CN 1883835 A CN1883835 A CN 1883835A CN 200510078372 CN200510078372 CN 200510078372 CN 200510078372 A CN200510078372 A CN 200510078372A CN 1883835 A CN1883835 A CN 1883835A
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Abstract
The invention relates to a continuous casting and rolling preparation method of general plate blank, which is soaking and heating the normal continuous casting plate blank in stepping soaking pit and inductive heating furnace, and directly rolling by roughing mill group when temperature of continuous casting plate achieves to rolling temperature. The invention is characterized in that arrangement between continuous casting machine and rolling mill is compact, continuous casting plate blank is directly charging, uniformly planning and designing the process equipment such as pretreatment of molten iron, steelmaking, refining, continuous casting, rough rolling, fine rolling to finished strip coiling and so on to constitute a process flow production line for continuous preparing hot-rolled sheet, saving energy, reducing working procedure and area of corresponding apparatus and factory building, and shortening production period. The invention provides a plate preparation method of less investment, good product quality and low production cost for steel corporation with production scale of 3,000,000 ton/year.
Description
Technical field
The present invention relates to a kind of continuous casting and rolling and produce the production method of coiled sheet, particularly a kind of compact technology arrangement is produced the method for conventional slab coiled sheet, i.e. the production method of coiled sheet by continuous casting and tandem rolling of regular slab.
Background technology
At present, several processes commonly used, for example: CSP technology---the thin plate blank continuously casting and continuously rolling technology of SMS, slab thickness are 70/50mm, its yearly productive capacity is about 2,000,000 tons; ISP technology---the thin plate blank continuously casting and continuously rolling technology of Demag, slab thickness are 100/80mm, and its yearly productive capacity is about 2,000,000 tons/year; The CONROLL technology of VAI---cut deal continuous-casting tandem-rolling technology, slab thickness are 100～125mm, and its yearly productive capacity is approximately 2,000,000 tons/year.
Adopt the induction heater heating up continuous casting plate blank, in existing continuously casting and continuously rolling technology, have only the ISP technology of Demag to adopt induction heater, and in gondola ARVED factory, the NO1-ISP of POSCO Co., Ltd. production line of Korea S uses.Its technology is as follows: continuous casting steel billet directly enters in the roughing unit of continuous layout and is rolled, intermediate blank after the roughing unit is rolling is heated to rolling temperature through induction heater again, carries out soaking at Cremona stove (Arved) or in acceleration stove and holding furnace then.Heating earlier, back soaking, therefore the iron scale that forms is many, and the energy that consumes is big.
In a word, from the CSP advanced technology of the exploitation development constantly gradually later on of eighties of last century the nineties, be the method that the conventional slab continuous casting rolling of 160～200mm is produced coiled sheet but also there is not production capacity to reach 3,000,000 tons, slab thickness so far.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art and defective, a kind of production method of coiled sheet by continuous casting and tandem rolling of regular slab is provided, and production scale is big to adapt to, production capacity reaches about 3,000,000 tons or above and economical and energy saving ground, produce the technological requirement of high-quality coiled sheet efficiently.
For reaching above-mentioned purpose, the present invention proposes a kind of production method of coiled sheet by continuous casting and tandem rolling of regular slab, comprises step:
A. molten iron preliminary treatment;
B. steel-making;
C. refined molten steel makes it the composition and the temperature that reach qualified;
D. molten steel is injected conticaster;
E. with flame cutting machine cutting continuous casting steel billet;
F. with machine for moving steel continuous casting steel billet is moved to heating soaking pit front roller-way;
G. heat the soaking continuous casting steel billet;
H. continuous casting steel billet is carried out roughing;
I. finish rolling becomes qualified finished product;
J. laminar flow cools off qualified finished product;
K. finished product is batched and is coiled sheet by continuous casting and tandem rolling of regular slab, it is characterized in that:
Described steps d is injected conticaster with molten steel, adopts the second-rate straight-camber multipoint straightening slab caster of a machine, and pans to crystallizer adopts the protection casting of submersed nozzle;
Described step e also comprises the burr on the continuous casting steel billet that adopts after flash trimmer is removed cutting with in the flame cutting machine cutting continuous casting steel billet;
Described step f moves to heating soaking pit front roller-way with machine for moving steel with continuous casting steel billet, further comprise from second-rate straight-the two stream caster slabs that camber multipoint straightening slab caster is sent here of a described machine, each stream caster slab respectively adopts a horizontal machine for moving steel, continuous casting steel billet is transplanted on merges into first-classly on the roller-way before the stepping soaking pit, and weigh, locate;
Described step g heating soaking continuous casting steel billet, comprise and to merge into the first soaking in the stepping soaking pit of packing into of first-class continuous casting steel billet, and only rely on the heat of continuous casting steel billet itself in described stepping soaking pit, to carry out soaking, board briquette after the soaking is 980 ℃～1050 ℃, continuous casting steel billet after the soaking is put on the furnace delivery table by discharging machine, and then enter in the induction heater and heat, regulate time inside furnace according to steel grade, slab thickness, supplied materials temperature and tapping temperature, reach tapping temperature;
It is that continuous casting steel billet is rolling through heavy vertical miller, the reversible roughing mill of four rollers and four-roll universal rolling machine that described step h carries out roughing to continuous casting steel billet, continuous casting steel billet is rolling 2～3 passages on heavy vertical miller, rolling 3～5 passages on the reversible roughing mill of four rollers, the adjustable-width of heavy vertical miller is 100mm, after heavy vertical miller is rolling, use a de-scaling of water under high pressure, after the reversible roughing mill of four rollers is rolling, use the water under high pressure secondary descaling steel once more, the pressure of water under high pressure is more than or equal to 16 MPas, smaller or equal to 20 MPas;
Slab is incubated before adopting the stay-warm case that can swing to finish rolling above the conveyor roller between described roughing step h and finish rolling step I;
Before described finish rolling step I to finish rolling before slab adopt the strip edge heater heating, the limit portion temperature drop of slab before the control finish rolling is so that the temperature of slab both sides is even before the finish rolling;
With mm finishing mill unit the finish rolling slab is carried out constant speed rolling in described finish rolling step I, the maximal rate of finish rolling end rolling mill outlet is 15m/s.
As another kind of embodiment, described step g heating soaking continuous casting steel billet also can adopt walking beam furnace, carries out soaking, heating slab simultaneously, perhaps cushions slab.
,, before carrying out described step g heating soaking continuous casting steel billet, adopt online hot scarfing machine that continuous casting steel billet is carried out peeling and handle the extra high product of surperficial quality requirement according to technological requirement, guarantee that slab surface quality satisfies technological requirement.
In described step g heating soaking continuous casting steel billet, the local temperature inequality by a small amount of burner adjusting continuous casting steel billet in the stepping soaking pit is so that the temperature difference of sequence casting slab≤30 ℃.
Described step h uses hydraulic pressure to depress to the heavy vertical miller that continuous casting steel billet carries out in the roughing, to realize short stroke control, advises positive slab end to end near rectangle, realizes the optimization shearing, realizes AWC control, and the slab body is carried out automatic width control.
Among the described step h, before described high-pressure water descaling by finish rolling before the strip edge heater heating slab on slab both sides, improve before the finish rolling 40～60 ℃ of slab dual-side portion temperature.
Adopt the production method of coiled sheet by continuous casting and tandem rolling of regular slab of the present invention; can be with the molten iron preliminary treatment; steel-making; refining; continuous casting; roughing; finish rolling to process equipment unified plannings such as finished strip batches design; form a uninterrupted technological process production line of producing hot-rolled sheet coil; logistics is smooth and easy; make full use of the heat of continuous casting steel billet; steel slab surface iron scale growing amount is few; temperature is even; regulate flexibly; capable of fast starting/as to stop, discharge amount of exhaust gas is few, helps environmental protection; under the constant substantially condition of the rolling condition of constructing mm finishing mill unit, improve product quality.
The present invention compared with prior art has following good effect:
(1) have very big elasticity and flexibility in the production, surface quality can satisfy peak demand, as automobile exterior panel etc., can produce difficult casting and difficult shaping steel, has high production reliability, and production capacity is big;
(2) the present invention adopts the mode that heats after the first soaking, carries out soaking with the short time at a lower temperature, and it is few to form the iron scale amount; When heat the back, heat with very short time under higher temperature, it is few to form the iron scale amount, and firing rate is fast, and is easy to operate;
(3) target temperature control accuracy height, the temperature fluctuation of whole strand is little and even, CO
2Reduce with the NO toxic emission, help environmental protection;
(4) it is wide to adopt heavy vertical miller to transfer, and conticaster is frequent to be transferred the wide conticaster activity duration that influences to alleviate;
(5) adopt edger roll scale breading+high-pressure water descaling, scale removal effect is very good, and the de-scaling water pressure is more than or equal to 16 MPas, smaller or equal to 20 MPas.
Description of drawings
Fig. 1 is the process chart of first embodiment of the present invention;
Fig. 2 is the technology arrangement figure of first embodiment of the present invention;
Fig. 3 is the process chart of second embodiment of the present invention;
Fig. 4 is the technology arrangement figure of second embodiment of the present invention.
Symbol description among the figure
1 molten steel, 2 conticasters, 3 flame cutting machines
4 flash trimmers, 5 machine for moving steel, 6 hot scarfing machines
7 stepping soaking pits, 8 induction heaters, 9 heavy vertical millers
10 reversible roughing mill 12 4 roller universal roughing mills of dephosphorization 11 4 rollers
The 15 secondary dephosphorization of 13 stay-warm cases, 14 strip edge heaters
16 mm finishing mill unit, 17 cooling facility for laminar flow, 18 coiling machines
20 walking beam furnaces
The specific embodiment
Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is further described.
As depicted in figs. 1 and 2, be the process chart and the technology arrangement figure of first embodiment of the present invention, the invention provides a kind of production method of coiled sheet by continuous casting and tandem rolling of regular slab, comprise step:
A. molten iron preliminary treatment;
B. steel-making;
C. refined molten steel 1, makes it the composition and the temperature that reach qualified;
D. molten steel 1 is injected conticaster 2;
E. with flame cutting machine 3 cutting continuous casting steel billets;
F. with machine for moving steel 5 continuous casting steel billet is moved to heating soaking pit front roller-way;
G. heat the soaking continuous casting steel billet;
H. continuous casting steel billet is carried out roughing;
I. finish rolling becomes qualified finished product;
J. carry out the laminar flow cooling with 17 pairs of qualified finished products of cooling facility for laminar flow;
K. with coiling machine 18 finished product is batched and be coiled sheet by continuous casting and tandem rolling of regular slab, wherein:
Described steps d is injected conticaster 2 with molten steel 1, adopts the second-rate straight-camber multipoint straightening slab caster 2 of a machine, and ladle to pans adopt protective casing, the argon gas sealing, and pans to crystallizer adopts the protection casting of submersed nozzle;
Described step e also comprises the burr on the continuous casting steel billet that adopts after flash trimmer 4 removals cut into scale with in the flame cutting machine 3 cutting continuous casting steel billets;
Described step f moves to heating soaking pit front roller-way with machine for moving steel 5 with continuous casting steel billet, further comprise from second-rate straight-the two stream caster slabs that camber multipoint straightening slab caster 2 is sent here of a described machine, as depicted in figs. 1 and 2, each stream caster slab respectively adopts a horizontal machine for moving steel 5, continuous casting steel billet is transplanted on merges into first-classly on the roller-way before the stepping soaking pit 7, and order is weighed, is located by measuring weighing device;
Described step g heating soaking continuous casting steel billet, comprise and to merge into the first soaking in the stepping soaking pit 7 of packing into of first-class continuous casting steel billet, and mainly only rely on the heat of continuous casting steel billet itself in described stepping soaking pit 7, to carry out soaking, board briquette after the soaking is 980 ℃～1050 ℃, continuous casting steel billet after the soaking is put on the furnace delivery table by discharging machine, and then enter in the induction heater 8 and heat, according to steel grade, slab thickness, supplied materials temperature and tapping temperature are regulated time inside furnace, reach tapping temperature, be characterized in, steel slab surface iron scale growing amount is few, temperature is even, regulates flexibly, and is capable of fast starting/stop, discharge amount of exhaust gas is few, helps environmental protection;
It is that continuous casting steel billet is once rolling through heavy vertical miller 9, the reversible roughing mill 11 of four rollers and four-roll universal rolling machine 12 that described step h carries out roughing to continuous casting steel billet, continuous casting steel billet is rolling 2～3 passages on heavy vertical miller 9, rolling 3～5 passages on the reversible roughing mill 11 of four rollers, the adjustable-width of heavy vertical miller 9 is 100mm, behind heavy vertical miller 9 rolling scale breadings, carry out a de-scaling 10 with water under high pressure, after the reversible roughing mill of four rollers 11 is rolling, carry out secondary descaling steel 15 with water under high pressure once more, the pressure of water under high pressure is more than or equal to 16 MPas, smaller or equal to 20 MPas;
Slab is incubated before adopting the 13 pairs of finish rolling of stay-warm case that can swing above the conveyor roller between described roughing step h and finish rolling step I, can reduce thermal loss 60～70%;
Before described finish rolling step I slab before the finish rolling after the insulation is adopted strip edge heater 14 heating, the limit portion temperature drop of slab before the control finish rolling so that the temperature of slab both sides is even before the finish rolling, carries out secondary descaling steel 15 then;
Carry out constant speed rolling with 16 pairs of finish rolling slabs of mm finishing mill unit in described finish rolling step I, the maximal rate of finish rolling end rolling mill outlet is 15m/s, thereby makes the rolling condition of finish rolling slab in the whole operation of rolling constant substantially, to improve product quality.
According to technological requirement to the extra high product of surperficial quality requirement, before carrying out described step g heating soaking continuous casting steel billet, adopting 6 pairs of continuous casting steel billets of online hot scarfing machine to carry out peeling handles, guarantee that slab surface quality satisfies technological requirement, when hot scarfing machine 6 does not use outside the extensible production line.
In described step g heating soaking continuous casting steel billet, the local temperature inequality by a small amount of burner adjusting continuous casting steel billet stepping soaking pit 7 in is so that the temperature difference of sequence casting slab≤30 ℃.Buffering area and soaking zone are set in the stepping soaking pit 7, and buffering area can be placed 〉=2 blocks of full duration continuous casting steel billets, buffering area room during ordinary production, buffer time 〉=10 minute.During ordinary production, with pack into the original position of soaking zone of continuous casting steel billet, at mill roll or when accidental shutdown takes place in short-term, conticaster 2 continues casting with long-armed charger, and the continuous casting steel billet after the casting is placed in the buffering area.
Described step h carries out heavy vertical miller 9 in the roughing to continuous casting steel billet to be used holding-down device of hydraulic to carry out hydraulic pressure to depress, to realize short stroke control, advise positive slab end to end near rectangle, realize the optimization shearing, realize AWC control, the slab body is carried out automatic width control.
Among the described step h, before described water under high pressure secondary descaling steel 15 by finish rolling before the strip edge heater 14 heating slabs on slab both sides, improve before the finish rolling 40～60 ℃ of slab dual-side portion temperature, improve limit portion temperature drop.
According to technological requirement, can adopt long-armed charger that continuous casting steel billet is directly packed in stepping soaking pit 7 or the induction heater 8, slab is carried out soaking, heating or buffering.
As shown in Figure 3 and Figure 4, as another kind of embodiment, under or the situation that electric energy is not enough higher in electricity price, described step g heating soaking continuous casting steel billet, under the constant situation of other conditions, also can adopt same walking beam furnace 20, replace stepping soaking pit 7 and induction heater 8, carry out soaking, heating slab simultaneously, perhaps the slab buffering.Can reach same effect, obtain the coiled sheet of high-quality.
The specification of the coiled sheet product of producing by above technological process can reach:
Width: 900～1880mm
Thickness: 1.2～25.4mm
The steel grade material that can produce is straight carbon steel, quality carbon steel and low-alloy steel.Coiled sheet production capacity can reach about 3,000,000 tons/year or more than.
Claims (6)
1. the production method of a coiled sheet by continuous casting and tandem rolling of regular slab comprises step:
A. molten iron preliminary treatment;
B. steel-making;
C. refined molten steel makes it the composition and the temperature that reach qualified;
D. molten steel is injected conticaster;
E. with flame cutting machine cutting continuous casting steel billet;
F. with machine for moving steel continuous casting steel billet is moved to heating soaking pit front roller-way;
G. heat the soaking continuous casting steel billet;
H. continuous casting steel billet is carried out roughing;
I. finish rolling becomes qualified finished product;
J. laminar flow cools off qualified finished product;
K. finished product is batched and is coiled sheet by continuous casting and tandem rolling of regular slab, it is characterized in that:
Described steps d is injected conticaster with molten steel, adopts the second-rate straight-camber multipoint straightening slab caster of a machine, and pans to crystallizer adopts the protection casting of submersed nozzle;
Described step e also comprises the burr on the continuous casting steel billet that adopts after flash trimmer is removed cutting with in the flame cutting machine cutting continuous casting steel billet;
Described step f moves to heating soaking pit front roller-way with machine for moving steel with continuous casting steel billet, further comprise from second-rate straight-the two stream caster slabs that camber multipoint straightening slab caster is sent here of a described machine, each stream caster slab respectively adopts a horizontal machine for moving steel, continuous casting steel billet is transplanted on merges into first-classly on the roller-way before the stepping soaking pit, and weigh, locate;
Described step g heating soaking continuous casting steel billet, comprise and to merge into the first soaking in the stepping soaking pit of packing into of first-class continuous casting steel billet, and only rely on the heat of continuous casting steel billet itself in described stepping soaking pit, to carry out soaking, board briquette after the soaking is 980 ℃～1050 ℃, continuous casting steel billet after the soaking is put on the furnace delivery table by discharging machine, and then enter in the induction heater and heat, regulate time inside furnace according to steel grade, slab thickness, supplied materials temperature and tapping temperature, reach tapping temperature;
It is that continuous casting steel billet is rolling through heavy vertical miller, the reversible roughing mill of four rollers and four-roll universal rolling machine that described step h carries out roughing to continuous casting steel billet, continuous casting steel billet is rolling 2～3 passages on heavy vertical miller, rolling 3～5 passages on the reversible roughing mill of four rollers, the adjustable-width of heavy vertical miller is 100mm, after heavy vertical miller is rolling, use a de-scaling of water under high pressure, after the reversible roughing mill of four rollers is rolling, use the water under high pressure secondary descaling steel once more, the pressure of water under high pressure is more than or equal to 16 MPas, smaller or equal to 20 MPas;
Slab is incubated before adopting the stay-warm case that can swing to finish rolling above the conveyor roller between described roughing step h and finish rolling step I;
Before described finish rolling step I to finish rolling before slab adopt the strip edge heater heating, the limit portion temperature drop of slab before the control finish rolling is so that the temperature of slab both sides is even before the finish rolling;
With mm finishing mill unit the finish rolling slab is carried out constant speed rolling in described finish rolling step I, the maximal rate of finish rolling end rolling mill outlet is 15m/s.
2. the production method of coiled sheet by continuous casting and tandem rolling of regular slab according to claim 1, wherein, described step g heating soaking continuous casting steel billet adopts walking beam furnace, carries out soaking, heating slab simultaneously, perhaps cushions slab.
3. the production method of coiled sheet by continuous casting and tandem rolling of regular slab according to claim 1 and 2, wherein, according to technological requirement to the extra high product of surperficial quality requirement, before carrying out described step g heating soaking continuous casting steel billet, adopt online hot scarfing machine that continuous casting steel billet is carried out peeling and handle, guarantee that slab surface quality satisfies technological requirement.
4. the production method of coiled sheet by continuous casting and tandem rolling of regular slab according to claim 1, wherein, in described step g heating soaking continuous casting steel billet, the local temperature inequality by a small amount of burner adjusting continuous casting steel billet in the stepping soaking pit is so that the temperature difference of sequence casting slab≤30 ℃.
5. the production method of coiled sheet by continuous casting and tandem rolling of regular slab according to claim 1, wherein, described step h uses hydraulic pressure to depress to the heavy vertical miller that continuous casting steel billet carries out in the roughing, to realize short stroke control, advise positive slab end to end near rectangle, the realization optimization is sheared, and realizes AWC control, and the slab body is carried out automatic width control.
6. the production method of coiled sheet by continuous casting and tandem rolling of regular slab according to claim 1, wherein, among the described step h, before described high-pressure water descaling by finish rolling before the strip edge heater heating slab on slab both sides, improve before the finish rolling 40～60 ℃ of slab dual-side portion temperature.
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| CN 200510078372 CN1883835A (en) | 2005-06-20 | 2005-06-20 | Method for producing coiled sheet by continuous casting and tandem rolling of regular slab |
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| CN105414237A (en) * | 2015-12-11 | 2016-03-23 | 山东石横特钢集团有限公司 | Steel section producing device and process thereof |
| CN108602102A (en) * | 2016-01-27 | 2018-09-28 | 杰富意钢铁株式会社 | The manufacturing method of the manufacturing equipment row and hot rolled strip of hot rolled strip |
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| CN106734252A (en) * | 2016-12-14 | 2017-05-31 | 四川德胜集团钒钛有限公司 | A kind of slab heat send technique |
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| CN113396022A (en) * | 2018-12-06 | 2021-09-14 | 达涅利机械设备股份公司 | Apparatus and method for producing strip |
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| CN112108519B (en) * | 2019-06-19 | 2022-09-20 | 宝山钢铁股份有限公司 | Hot-rolled strip steel production system and method based on hybrid heating |
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