CN105014021B - The method and device of closed room temperature under a kind of reduction thin strap continuous casting - Google Patents
The method and device of closed room temperature under a kind of reduction thin strap continuous casting Download PDFInfo
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- CN105014021B CN105014021B CN201410161630.7A CN201410161630A CN105014021B CN 105014021 B CN105014021 B CN 105014021B CN 201410161630 A CN201410161630 A CN 201410161630A CN 105014021 B CN105014021 B CN 105014021B
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Abstract
The present invention is a kind of method and device of closed room temperature under reduction thin strap continuous casting, it is related to thin strap continuous casting field, solve the problems, such as existing process can not and meanwhile take into account confined chamber strip under thin strap continuous casting it is anti-oxidation and reduce rolling temperature, this method is to carry out following improvement on the basis of existing twin-roll thin strip continuous casting technique：Liquid nitrogen is injected to lower confined chamber, several passages for leading to lower confined chamber is evenly arranged on the surrounding wall of confined chamber under the thin strap continuous casting, liquid nitrogen is connected with passage；Liquid nitrogen flow in each passage and liquid nitrogen pressure are adjusted；Oxygen concentration to lower confined chamber carries out closed-loop control；Closed-loop control is carried out to on-line rolling temperature, by inlet temperature control in the range of 900-1150 DEG C.The present invention can simultaneously realize the purpose to confined chamber fast cooling under thin strap continuous casting, effectively prevent steel band from aoxidizing, and realize relatively low steel band rolling temperature, improve the cooling uniformity of steel band, be conducive to improving the plate shape and surface quality of strip.
Description
Technical field
The present invention relates to thin strap continuous casting field, a kind of method and dress for reducing closed room temperature under thin strap continuous casting is referred in particular to
Put.
Background technology
In recent years, both at home and abroad to exploitation steel band direct pouring technology（That is the nearly end form process technology of strip）Research activities get over
Come more active, with fastest developing speed is twin-roll thin strip continuous casting technology among these.
Twin-roll thin strip continuous casting technology is earliest that Henry Bessemer in 1865 propose this idea（US Patent:
49053）.Thin strap continuous casting combines continuously casting, rolling, the even operation such as heat treatment together, makes the strip base of production slightly after
Continuous rolling is just disposable to form finished industrial product, enormously simplify the production process from molten steel to steel band, shortens the production cycle, makes
Steel Production Flow Chart is more compact, more continuous, more efficient, more environmentally friendly；Production cost is significantly reduced simultaneously, and the strip produced
Product quality is no less than traditional handicraft.Therefore, this technology brings revolutionary impact to world steel industry.
The typical apparatus structure of twin-roll thin strip continuous casting and technological process are as shown in Figure 1：
Molten steel in big bag 1 by big bag long nozzle 2, tundish 3 and flow distribution device 4 cast directly over one by
In the molten bath 7 that two crystallization roll 5a, 5b that relatively rotate and can quickly cool down and lateral seal 6a, 6b are surrounded, molten steel is in knot
The peripheral surface of brilliant roller 5a, 5b rotation solidifies to form solidified shell and be grown into, and then at the roll gap gap minimum of two crystallization rolls
（Nip points）The thick steel bands 11 of 1-5mm are formed, steel band 11 is via guide plate 9 and is oriented to pinch roll 12 and is sent into by rollgang 15
The strip of 0.7-2.5mm is rolled into milling train 13, cooling device 14 is then passed through and is cooled down, finally sent after the crop of shear arrangement 16
Enter the ＇ of coiling machine 19,19 to batch in rolls, wherein, the crop that shear arrangement 16 is cut enters flying shear hole 18 by flying shear guide plate 17.
When hot-strip is used as Thin Specs hot rolled plate or " with hot Dai Leng " product, to strip surface quality requirement very
It is high.The general thickness more Bao Yuehao for requiring belt steel surface oxide skin, this is accomplished by follow-up each stage control oxidation of steel band
The generation of iron sheet, in the typical process as shown in Fig. 1, in crystallization roll 5a, 5b until the entrance of milling train 13 uses confined chamber 10
Prevent steel band from aoxidizing, in confined chamber 10, such as patent US6920912 is using the scheme of addition hydrogen and in patent
Oxygen content is controlled in US20060182989 less than 5% to control the scale thickness of steel strip surface.But it is this exist it is following
Drawback：The temperature of steel strips that molten steel goes out after crystallization roll 5a, 5b is up to more than 1400 DEG C, in the case of long-term casting, the heat radiation of steel band
Effect is very big, causes the environment temperature of confined chamber 10 to be up to more than 800 DEG C, sometimes even over 1000 DEG C.By steel construction system
The underframe and confined chamber wall of the confined chamber 10 made can be on active service in load-bearing at a high temperature of long-term, it may occur that high temperature deformation, so that
The intensity and precision of whole mechanical framework are influenceed, by the high-temerature creep effect of long period, it also occur that underframe is welded
The danger such as the cracking at connection interface.Above-mentioned patent consider closed protective atmosphere when do not consider thin strap continuous casting under confined chamber cooling
Measure.
For the above-mentioned confined chamber problem being related to, many producers have also been made many work in terms of the cooling of confined chamber, than
The wall that lower confined chamber surrounding has been reported if the light factory thin strap continuous casting of Nippon Steel reaches the mesh of cooling in the form of water-cooling wall
, concrete scheme is lower confined chamber wall using two pieces of steel plate welding, the cooling duct of middle setting copper material, the logical circulation in inside
Water；The Castrip of U.S. Nucor is (see patent US5960856A）The purpose of cooling is reached in the form of " water-cooled pillow ", specifically
Scheme be from strip slightly close to place water-cooled pillow is set, the inside leads to recirculated water, and form is as in big room（Confined chamber）
One small heat-insulated room is set（Water-cooled pillow is surrounded）, the small heat-insulated room that strip is surrounded through water-cooled pillow, temperature is absorbed, in band
While steel is cooled down, play to big room（Confined chamber）Temperature drop effect.
Additionally, in conventional strip technical process, also there is a problem of one it is larger, be exactly steel band before milling train is entered
Temperature is often as high as more than more than 1200 DEG C, or even 1250 DEG C, and strip now is very soft, and elevated temperature strength is very low, causes
The milling train that line is equipped with cannot apply larger roll-force, it is difficult to effectively roll, the plate shape after rolling does not reach the requirement of product yet.
Some producers carry out water-spraying control before milling train in order to reduce steel band rolling temperature to strip, and strip and the cooling water of high temperature connect
It is tactile to bring problems：（1）The strip of high temperature is contacted with cooling water, and the scale thickness of steel strip surface increases quickly；（2）It is cold
But water can form water spots in belt steel surface（Rust staining）, influence surface quality；（3）Cooling water easily causes belt steel surface Local cooling
It is uneven, the uneven of strip interior microscopic tissue is caused, so as to cause the uneven of strip property, influence product quality；（4）
Belt steel surface Local cooling is uneven, can cause the deterioration of plate shape, influences strip shape quality.
Above-mentioned patent or operational version are all unilaterally to go solve problem, or individually go solution confined chamber strip to prevent
The problem of oxidation, or individually go to solve the problems, such as that confined chamber is lowered the temperature, or individually go to solve to reduce steel band rolling temperature
Problem, these measures do not provide one while taking into account that confined chamber strip under thin strap continuous casting is anti-oxidation, reduce closed room temperature
Drop and the effectively scheme of reduction steel band rolling temperature.
The content of the invention
The invention aims to solve the problems, such as prior art, there is provided one kind reduces confined chamber under thin strap continuous casting
The method of temperature, can realize that strip is anti-oxidation, reduce belt steel surface iron scale thickness；Realize the fast prompt drop of lower confined chamber
Temperature；The temperature before steel band feed mill is effectively reduced, steel band cooling uniformity can also be improved.
Another side of the invention be to provide it is a kind of reduce thin strap continuous casting under closed room temperature device.
The purpose of the present invention is achieved through the following technical solutions：
A kind of method of closed room temperature under reduction thin strap continuous casting, it is included：Molten steel in big bag is by big bag length
The mouth of a river, tundish and flow distribution device cast directly over a crystallization roll that relatively rotated by two and can quickly be cooled down and side
In the molten bath that seal apparatus are surrounded, molten steel solidifies to form solidified shell and be grown into the peripheral surface that crystallization roll rotates, Jin Er
The thick steel bands of 1-5mm are formed at the roll gap gap minimum of two crystallization rolls, steel band is via guide plate and is oriented to pinch roll and passes through conveying roller
0.7-2.5mm strips are rolled into road feeding milling train, cooling device cooling is then passed through, finally sent after shear arrangement crop
Enter coiling machine to batch in rolls, wherein, two crystallization rolls to inlet of rolling mill are in lower confined chamber, it is characterised in that also included：
To the lower confined chamber injection liquid nitrogen, it is evenly arranged on the surrounding wall of confined chamber under the thin strap continuous casting several
Lead to the passage of lower confined chamber, liquid nitrogen is connected with passage, passage starts to be noted in downward confined chamber in the hot charging process before casting
Enter liquid nitrogen；
The liquid nitrogen flow in each passage is adjusted, the liquid nitrogen flow in each passage is 1-5m3/h；
Liquid nitrogen pressure in regulation injection channel, makes the liquid nitrogen pressure in injection channel be 0.1-0.3MPa；
Oxygen concentration to lower confined chamber carries out closed-loop control, and the injection rate of liquid nitrogen is adjusted by monitoring oxygen concentration；
Closed-loop control is carried out to on-line rolling temperature, the porch before steel band feed mill 213 is provided with thermometer, to steel band
Inlet temperature before feed mill is monitored, by inlet temperature control in the range of 900-1150 DEG C：When inlet temperature is higher than
At 1150 DEG C, synthesized and coordinated by the liquid nitrogen injection rate and regulation casting rate that increase to lower confined chamber 210, make steel band
Inlet temperature before feed mill is less than 1150 DEG C；When inlet temperature be less than 900 DEG C when, by under reduction to lower confined chamber 210
Liquid nitrogen injection rate and regulation casting rate are synthesized and coordinated, and make the entrance before steel band feed mill be higher than 900 DEG C；It is of the invention
It is compared with the prior art relatively low that rolling temperature is controlled at 900-1150 DEG C, is favourable for rolling, and rolling temperature is got over
It is low, be more conducive to rolling the control of strip shape quality.
High density nitrogen excessive in confined chamber and the air of initial stage discharge under collecting.
The arrangement density of the passage is every square metre and sets 64-100, and the pipeline diameter of each passage is 10-20mm.
The implementation method for adjusting liquid nitrogen flow in each passage：The surrounding wall of the lower confined chamber is divided into five
Block：Antetheca, rear wall, left wall, right wall and pinch roll top；The liquid nitrogen input of the passage in each block is connected to a liquid
Nitrogen is in charge of, and the liquid nitrogen input that 5 liquid nitrogen are in charge of is connected on a liquid nitrogen house steward, and liquid nitrogen house steward be connected with liquid nitrogen source；Often
Root liquid nitrogen is in charge of and is disposed with a flow control valve, and the opening degree of each flow control valve is controlled by controller, realizes logical
Flow-rate adjustment in road.
The implementation method of liquid nitrogen pressure in the regulation injection channel：One is provided between the liquid nitrogen house steward and liquid nitrogen source
Individual pressure-regulating valve, realizes that the liquid nitrogen pressure in passage is adjusted by the pressure-regulating valve.
It is described liquid nitrogen is adjusted by monitoring oxygen concentration injection rate refer to：By the oxygen concentration instrument connected with lower confined chamber
Oxygen content in the lower confined chamber of monitoring, regulation is injected into the amount of liquid nitrogen in lower confined chamber, and the liquid nitrogen flow in each passage is
1-5m3Ensure the oxygen concentration in lower confined chamber below 5% in the range of/h.
Inlet temperature before the feed mill to steel band controls the implementation method in the range of 900-1150 DEG C：When entering
When mouth temperature is higher than 1150 DEG C, comprehensive association is carried out by the liquid nitrogen injection rate and regulation casting rate that increase to lower confined chamber
Adjust, the inlet temperature before steel band feed mill is less than 1150 DEG C；It is closed under by reducing when inlet temperature is less than 900 DEG C
The liquid nitrogen injection rate and regulation casting rate of room are synthesized and coordinated, and make the entrance before steel band feed mill be higher than 900 DEG C.
Another side of the invention is realized in：
The device of closed room temperature under a kind of reduction thin strap continuous casting, it is included：Molten steel is loaded with big bag, big bag is successive successively
Connect crystallization roll that big bag long nozzle, tundish and flow distribution device and one relatively rotates by two and can quickly be cooled down and
The molten bath that lateral seal is surrounded, molten steel forms the thick steel bands of 1-5mm at two roll gap gap minimums of crystallization roll, and steel band is via leading
Plate and it is oriented to and pinch roll and milling train is entered by rollgang, be rolled into the strip of 0.7-2.5mm, through apparatus for supercooling, then passes through
Last feeding coiling machine is batched in rolls after shear arrangement crop, wherein, two crystallization rolls are until inlet of rolling mill is under one
In confined chamber, it is characterised in that：
Several passages for leading to lower confined chamber are evenly arranged on the surrounding wall of the lower confined chamber, liquid is connected with passage
Nitrogen；
The passage is provided with the flow regulator of regulation liquid nitrogen flow；
The passage is provided with the pressure-regulating device of liquid nitrogen pressure in regulation injection channel；
The lower confined chamber connects an oxygen concentration instrument, and the oxygen concentration to lower confined chamber carries out closed-loop control, according to the oxygen
The oxygen concentration of concentration meter monitoring adjusts the injection rate of liquid nitrogen using the flow regulator；
Porch before steel band feed mill is provided with thermometer, and the inlet temperature before steel band feed mill is monitored, will
Inlet temperature is controlled in the range of 900-1150 DEG C；
The air of gas collector, the excessive high density nitrogen of collection and initial stage discharge is set on lower confined chamber.
The arrangement density of the passage is every square metre and sets 64-100, and the pipeline diameter of each passage is 10-20mm.
The flow regulator and pressure-regulating device refer to：The surrounding wall of the lower confined chamber is divided into five areas
Block：Antetheca, rear wall, left wall, right wall and pinch roll top；The liquid nitrogen input of the passage in each block is connected to a liquid nitrogen
It is in charge of, the liquid nitrogen input that 5 liquid nitrogen are in charge of is connected on a liquid nitrogen house steward, and liquid nitrogen house steward be connected with liquid nitrogen source；Every
Liquid nitrogen is in charge of and is disposed with a flow control valve as flow regulator, and each flow control valve is controlled by controller
Opening degree, realizes the Flow-rate adjustment in passage.
A pressure-regulating valve is provided between the liquid nitrogen house steward and liquid nitrogen source as pressure-regulating device, by the pressure
Force regulating valve realizes the liquid nitrogen pressure regulation in passage.
Beneficial effects of the present invention：
（1）The present invention is realized to confined chamber fast cooling under thin strap continuous casting using the physical vapor endothermic character of liquid nitrogen
Purpose, effectively prevent lower confined chamber steel structure frame high temperature deformation, it is to avoid the danger such as cracking at underframe welding junction occurs
Danger.
（2）Nitrogen after liquid nitrogen gasification is a kind of typical inert gas, can be coated on the surface of steel band, thus under it is closed
Without logical others inert gas in addition in room, it is possible to the purpose of confined chamber oxygen concentration control is played, so as to effectively prevent steel
Band oxidation, reduces the iron scale thickness of steel band.
（3）By the invention it is possible to relatively low steel band rolling temperature is realized, relatively low rolling temperature, for rolling
For be favourable, rolling temperature is lower, be more conducive to roll strip shape quality control.
（4）Nitrogen after gasification is coated on steel strip surface and can improve the cooling uniformity of steel band, and steel band can be made uniform
Cooling, particularly improves the temperature homogeneity on steel band bandwidth direction, improves the plate shape and surface quality of strip.
To further illustrate above-mentioned purpose of the invention, design feature and effect, the present invention is entered below with reference to accompanying drawing
Row is described in detail.
Brief description of the drawings
Fig. 1 is the typical structure schematic diagram of twin-roll thin strip continuous casting device；
Fig. 2 is twin-roll thin strip continuous casting apparatus structure schematic diagram of the present invention；
Fig. 3 is the structural representation that confined chamber temperature section under thin strap continuous casting is reduced in the present invention.
Specific embodiment
Specific embodiment of the invention is described in detail with reference to the accompanying drawing of embodiment.
Referring to Fig. 2, twin-roll thin strip continuous casting technological process of the present invention is as follows：
Molten steel in big bag 21 casts directly over one by big bag long nozzle 22, tundish 23 and flow distribution device 24
It is individual to be relatively rotated by two and in molten bath 27 that crystallization roll 25a, the 25b that quickly cool down and lateral seal 26a, 26b are surrounded,
Molten steel solidifies to form solidified shell and be grown into the peripheral surface that crystallization roll 25a, 25b rotate, and then in the roller of two crystallization rolls
At the minimum of gap（Nip points）The thick steel bands 211 of 1-5mm are formed, steel band 211 is via guide plate 29 and is oriented to pinch roll 212 and passes through
The strip of 0.7-2.5mm is rolled into the feeding milling train 213 of rollgang 215, cooling device 214 is then passed through and is cooled down, through flying shear
The last feeding ＇ of coiling machine 219,219 is batched in rolls after the crop of device 216, wherein, two crystallization rolls 25a, 25b to milling train 213 enter
Mouth is in a lower confined chamber 210, prevents steel band from aoxidizing；The crop that shear arrangement 216 is cut enters by flying shear guide plate 217
Enter flying shear hole 218.
The method of closed room temperature is under present invention reduction thin strap continuous casting：
Referring also to Fig. 2-Fig. 3, the present invention is to inject liquid nitrogen to the lower confined chamber 210：It is close under the thin strap continuous casting
Several passages 28 for leading to lower confined chamber 210 are evenly arranged on the surrounding wall of closed chamber 210, the arrangement density of passage 28 is often flat
Square rice 64-100, the pipeline diameter of passage 28 is 10-20mm, and liquid nitrogen is connected with passage 28, and these passages 28 are before casting
Injection liquid nitrogen in downward confined chamber 210 is begun to during hot charging process.
The liquid nitrogen flow in each passage is adjusted, the liquid nitrogen flow in each passage is 1-5m3/ h, its Flow-rate adjustment is this
What sample was realized：The surrounding wall of lower confined chamber 210 is divided into five blocks：On antetheca, rear wall, left wall, right wall and pinch roll 212
Side；The liquid nitrogen input of the passage 28 in each block is connected to a liquid nitrogen and is in charge of（It is not shown）, the liquid that 5 liquid nitrogen are in charge of
Nitrogen addition end is connected on a liquid nitrogen house steward, and liquid nitrogen house steward be connected with liquid nitrogen source（It is not shown）；Every liquid nitrogen is in charge of arrangement
There is a flow control valve, by controller（It is not shown）The opening degree of each flow control valve is controlled, is realized in passage 28
Flow-rate adjustment.
Liquid nitrogen pressure in regulation injection channel 28, makes the liquid nitrogen pressure in injection channel 28 for 0.1-0.3MPa, specifically
Regulation is：A pressure-regulating valve is provided between the liquid nitrogen house steward and liquid nitrogen source（It is not shown）, by the pressure-regulating valve
Realize the liquid nitrogen pressure regulation in passage 28.Liquid nitrogen stream in passage in the liquid nitrogen pressure and each passage of injection 0.1-0.3MPa
It is 1-5m to measure3During/h, it is possible to achieve the fast cooling of lower confined chamber 210, make lower confined chamber environment temperature during long-term production low
In 400 DEG C, so as to effectively prevent lower confined chamber steel structure frame high temperature deformation, it is to avoid the cracking at underframe welding junction occurs
Deng dangerous；Liquid nitrogen enter lower confined chamber 210, its rapid gasification, gasification is typical endothermic process, after touching hot strip
Substantial amounts of heat can be absorbed, so that temperature of steel strips is significantly reduced, makes temperature of the temperature of steel strips when lower confined chamber 210 is gone out effective
It is reduced to 900-1150 DEG C；Liquid nitrogen after gasification becomes nitrogen, and nitrogen is a kind of typical inert gas, can be coated on steel band
Surface, while preventing steel band from aoxidizing, steel band can be made uniformly to cool down, particularly improve steel band bandwidth direction on temperature it is equal
Even property, improves the plate shape and surface quality of strip；In lower confined chamber 210 by the way of logical liquid nitrogen, using the gasification of liquid nitrogen
Heat absorption physical characteristic, without logical others inert gas shielding strip, the nitrogen for directly being evaporated using liquid nitrogen gasification in addition
Realize the cooling to strip and protection against oxidation.
Oxygen concentration to lower confined chamber 210 carries out closed-loop control, and the injection rate of liquid nitrogen is adjusted by monitoring oxygen concentration：Under
The Flux Valve Control that the liquid nitrogen injection rate of confined chamber 210 is in charge of by described each liquid nitrogen, connects by with lower confined chamber 210
Logical oxygen concentration instrument（It is not shown）Oxygen content in the lower confined chamber 210 of monitoring, is controlled to be injected into down closed by flow control valve
Amount of liquid nitrogen in room 210, the liquid nitrogen flow in each passage is 1-5m3Ensure that the oxygen in lower confined chamber 210 is dense in the range of/h
Spend below 5%, to ensure iron scale thickness of the steel band on the preceding surface of feed mill 213<=10um.
The closed-loop control of on-line rolling temperature, the porch before steel band feed mill 213 is provided with thermometer（It is not shown）, it is right
Inlet temperature before steel band feed mill 213 is monitored, by inlet temperature control in the range of 900-1150 DEG C：Work as entrance
When temperature is higher than 1150 DEG C, comprehensive association is carried out by the liquid nitrogen injection rate and regulation casting rate that increase to lower confined chamber 210
Adjust, the inlet temperature before steel band feed mill is less than 1150 DEG C；It is closed under by reducing when inlet temperature is less than 900 DEG C
The liquid nitrogen injection rate and regulation casting rate of room 210 are synthesized and coordinated, and make the entrance before steel band feed mill be higher than 900 DEG C；
Rolling temperature control of the invention is compared with the prior art relatively low at 900-1150 DEG C, is favourable for rolling, is rolled
Temperature processed is lower, is more conducive to rolling the control of strip shape quality.
Gas collector 220 is set on lower confined chamber 210, for collecting excessive high density nitrogen and the initial stage
The air of discharge.
Referring to Fig. 2, the structure of twin-roll thin strip continuous casting device of the present invention is as follows：
Molten steel is loaded with big bag 21, big bag 21 connects big bag long nozzle 22, tundish 23 and flow distribution device in succession successively
It is molten that 24 and crystallization roll 25a, 25b that relatively rotated by two and can quickly be cooled down and lateral seal 26a, 26b are surrounded
Pond 27, molten steel solidifies to form solidified shell and be grown into the peripheral surface that two crystallization rolls 25a, 25b rotate, and then in two knots
At the roll gap gap minimum of brilliant roller 25a, 25b（Nip points）The thick steel bands 211 of 1-5mm are formed, steel band 211 is via guide plate 29 and is oriented to
Pinch roll 212 simultaneously enters milling train 213 by rollgang 215, is rolled into the strip of 0.7-2.5mm, cold through apparatus for supercooling 214
But, the last feeding ＇ of coiling machine 219,219 is batched in rolls after the crop of shear arrangement 216, wherein, two crystallization rolls 25a, 25b are extremely
The entrance of milling train 213 is in a lower confined chamber 210, prevents steel band from aoxidizing；The crop that shear arrangement 216 is cut is by flying shear
Guide plate 217 enters flying shear hole 218.
The device of closed room temperature is under present invention reduction thin strap continuous casting：
Referring also to Fig. 2-Fig. 3, is evenly arranged several leading under the thin strap continuous casting on the surrounding wall of confined chamber 210
The passage 28 of lower confined chamber 210, the arrangement density of passage 28 is every square metre of 64-100, and the pipeline diameter of passage 28 is 10-
20mm, liquid nitrogen is connected with passage 28, and these passages 28 begin to injection in downward confined chamber 210 in the hot charging process before casting
Liquid nitrogen.
Each passage 28 is provided with the flow regulator of regulation liquid nitrogen flow, the concrete structure of flow regulator：It is described
The surrounding wall of lower confined chamber 210 is divided into five blocks：Antetheca, rear wall, left wall, right wall and the top of pinch roll 212；Each block
The liquid nitrogen input of interior passage 28 is connected to a liquid nitrogen and is in charge of（It is not shown）, the liquid nitrogen input company that 5 liquid nitrogen are in charge of
It is connected on a liquid nitrogen house steward, liquid nitrogen house steward be connected with liquid nitrogen source（It is not shown）；Every liquid nitrogen is in charge of and is disposed with a flow
Regulating valve as flow regulator, by controller（It is not shown）The opening degree of each flow control valve is controlled, passage is realized
Flow-rate adjustment in 28.
The passage is provided with the pressure-regulating device of liquid nitrogen pressure in regulation injection channel：In the liquid nitrogen house steward and liquid nitrogen
A pressure-regulating valve is provided between source（It is not shown）As pressure-regulating device, realized in passage 28 by the pressure-regulating valve
Liquid nitrogen pressure regulation.
Lower confined chamber 210 connects an oxygen concentration instrument（It is not shown）, oxygen concentration instrument carries out to the oxygen concentration of lower confined chamber 210
Closed-loop control, the oxygen concentration monitored according to the oxygen concentration instrument adjusts the injection rate of liquid nitrogen using the flow regulator：Under
The Flux Valve Control that the liquid nitrogen injection rate of confined chamber 210 is in charge of by described each liquid nitrogen, connects by with lower confined chamber 210
Oxygen content in the lower confined chamber 210 of logical oxygen concentration instrument monitoring, is controlled to be injected into lower confined chamber 210 by flow control valve
Amount of liquid nitrogen, the liquid nitrogen flow in each passage is 1-5m3Ensure in the range of/h oxygen concentration in lower confined chamber 210 5% with
Under, to ensure iron scale thickness of the steel band on the preceding surface of feed mill 213<=10um.
Porch before steel band feed mill 213 is provided with thermometer（It is not shown）, to the entrance temperature before steel band feed mill 213
Degree is monitored, by inlet temperature control in the range of 900-1150 DEG C：When inlet temperature is higher than 1150 DEG C, by increasing
Big liquid nitrogen injection rate and regulation casting rate to lower confined chamber 210 is synthesized and coordinated, and makes the entrance before steel band feed mill
Temperature is less than 1150 DEG C；When inlet temperature is less than 900 DEG C, by reducing liquid nitrogen injection rate and tune to lower confined chamber 210
Section casting rate is synthesized and coordinated, and makes the entrance before steel band feed mill be higher than 900 DEG C；Rolling temperature control of the invention exists
900-1150 DEG C is compared with the prior art relatively low, is favourable for rolling, and rolling temperature is lower, is more conducive to rolling
The control of strip shape quality processed.
Gas collector 220 is set on lower confined chamber 210, for collecting excessive high density nitrogen and the initial stage
The air of discharge.
Embodiment 1
As shown in figure 3, under the thin strap continuous casting on the surrounding wall of confined chamber 210 every square metre be evenly arranged 80 passages
28, it is the liquid nitrogen of 0.1MPa to the injection pressure of passage 28, these passages 28 begin to work in the hot charging process before casting, to
Injection liquid nitrogen in lower confined chamber 10.The pressure injected in the passage of liquid nitrogen is 0.1MPa, and the liquid nitrogen flow in each passage is
1m3/ h, passage tube diameter 15mm, make the fast cooling of lower confined chamber 210, and lower confined chamber environment temperature during long-term production reaches
380 DEG C, can effectively prevent lower confined chamber steel structure frame high temperature deformation, it is to avoid cracking at generation underframe welding junction etc.
It is dangerous.
Liquid nitrogen gasifies rapidly after entering lower confined chamber 210, and gasification is typical endothermic process, after touching hot strip
Substantial amounts of heat can be absorbed, so that temperature of steel strips is significantly reduced, makes temperature of the temperature of steel strips when lower confined chamber 210 is gone out effective
It is reduced to 950 DEG C.Liquid nitrogen after gasification becomes nitrogen, and nitrogen is a kind of typical inert gas, can be coated on the surface of steel band,
While preventing steel band from aoxidizing, steel band can be made uniformly to cool down, particularly improve the temperature homogeneity on steel band bandwidth direction, carried
The plate shape and surface quality of strip high.In lower confined chamber 10 by the way of logical liquid nitrogen, using the gasification heat absorption physics of liquid nitrogen
Characteristic, without logical others inert gas shielding strip in addition, is directly realized to band using the nitrogen that liquid nitrogen gasification is evaporated
The cooling of steel and protection against oxidation.
The closed-loop control of lower confined chamber oxygen concentration：The injection rate of liquid nitrogen is supervised by Flux Valve Control by oxygen concentration instrument
Oxygen content in the lower confined chamber 210 of control, the amount of liquid nitrogen being injected into lower confined chamber 210 is controlled by flow control valve, it is ensured that under
Oxygen concentration in confined chamber 210 below 5%, to ensure iron scale thickness of the steel band on the preceding surface of feed mill 213<=10um.
The closed-loop control of on-line rolling temperature：In addition to the injection rate for adjusting liquid nitrogen except monitoring oxygen concentration, also to steel band
Inlet temperature before feed mill 213 is monitored, if inlet temperature be higher than 1150 DEG C, then by increase the injection rate of liquid nitrogen with
And regulation pulling rate is synthesized and coordinated, make the inlet temperature before steel band feed mill in the range of 900-1150 DEG C；If entrance temperature
Degree is less than 900 DEG C, then synthesized and coordinated by reducing the injection rate and regulation pulling rate of liquid nitrogen, makes the entrance before steel band feed mill
Temperature is in the range of 900-1150 DEG C.900-1150 DEG C of relatively low rolling temperature, for rolling be it is favourable,
Rolling temperature is lower, is more conducive to rolling the control of strip shape quality.
Gas collector 220 is set on lower confined chamber 210, for collecting excessive high density nitrogen and the initial stage
The air of discharge.
Embodiment 2
As shown in figure 3, under the thin strap continuous casting on the surrounding wall of confined chamber 210 every square metre be evenly arranged 65 passages
28, the inner liquid nitrogen for leading to certain pressure certain flow of passage 28, these passages 28 begin to work in the hot charging process before casting
Make, injection liquid nitrogen in downward confined chamber 210.The pressure injected in the passage of liquid nitrogen is 0.3MPa, the liquid nitrogen stream in each passage
It is 5m to measure3/ h, passage tube diameter 20mm, make the fast cooling of lower confined chamber 210, lower confined chamber environment temperature during long-term production
390 DEG C are reached, lower confined chamber steel structure frame high temperature deformation can be effectively prevented, it is to avoid opening at underframe welding junction occurs
Split etc. dangerous.
Liquid nitrogen gasifies rapidly after entering lower confined chamber 210, and gasification is typical endothermic process, after touching hot strip
Substantial amounts of heat can be absorbed, so that temperature of steel strips is significantly reduced, makes temperature of the temperature of steel strips when lower confined chamber 210 is gone out effective
It is reduced to 1000 DEG C.Liquid nitrogen after gasification becomes nitrogen, and nitrogen is a kind of typical inert gas, can be coated on the table of steel band
Face, while preventing steel band from aoxidizing, can be such that steel band uniformly cools down, and the temperature for particularly improving on steel band bandwidth direction is uniform
Property, improve the plate shape and surface quality of strip.In lower confined chamber 210 by the way of logical liquid nitrogen, inhaled using the gasification of liquid nitrogen
Thermophysical property, without logical others inert gas shielding strip, the nitrogen reality for directly being evaporated using liquid nitrogen gasification in addition
The now cooling to strip and protection against oxidation.
The closed-loop control of lower confined chamber oxygen concentration：The injection rate of liquid nitrogen is supervised by Flux Valve Control by oxygen concentration instrument
Oxygen content in the lower confined chamber 210 of control, the amount of liquid nitrogen being injected into lower confined chamber 210 is controlled by flow control valve, it is ensured that under
Oxygen concentration in confined chamber 210 below 5%, to ensure iron scale thickness of the steel band on the preceding surface of feed mill 213<=10um.
The closed-loop control of on-line rolling temperature：In addition to the injection rate for adjusting liquid nitrogen except monitoring oxygen concentration, also to steel band
Inlet temperature before feed mill 213 is monitored, if inlet temperature be higher than 1150 DEG C, then by increase the injection rate of liquid nitrogen with
And regulation pulling rate is synthesized and coordinated, make the inlet temperature before steel band feed mill in the range of 900-1150 DEG C；If entrance temperature
Degree is less than 900 DEG C, then synthesized and coordinated by reducing the injection rate and regulation pulling rate of liquid nitrogen, makes the entrance before steel band feed mill
Temperature is in the range of 900-1150 DEG C.900-1150 DEG C of relatively low rolling temperature, for rolling be it is favourable,
Rolling temperature is lower, is more conducive to rolling the control of strip shape quality.
Gas collector 220 is set on lower confined chamber 210, for collecting excessive high density nitrogen and the initial stage
The air of discharge.
The present invention is evenly arranged some passages on the surrounding wall by the confined chamber under the thin strap continuous casting, by certain pressure
Liquid nitrogen is continuously injected into confined chamber by these passages, monitors the oxygen content in lower confined chamber by oxygen concentration instrument to control
The amount of liquid nitrogen in lower confined chamber is injected into, to ensure that the oxygen concentration in lower confined chamber reaches less than 5%, realizes that strip is anti-oxidation,
Reduce belt steel surface iron scale thickness；Liquid nitrogen can realize the fast cooling of lower confined chamber；Steel band is effectively reduced simultaneously to enter to roll
Temperature before machine, the cooled gas cladding of steel band can also improve steel band cooling uniformity, improve strip surface quality.
Those of ordinary skill in the art is it should be appreciated that the embodiment of the above is intended merely to illustrate of the invention
Purpose, and limitation of the invention is not used as, as long as in essential scope of the invention, the change to embodiment described above
Change, modification will all fall in the range of claim of the invention.
Claims (8)
1. it is a kind of reduce thin strap continuous casting under closed room temperature method, it is included：Molten steel in big bag passes through big Bao Changshui
Mouth, tundish and flow distribution device cast directly over a crystallization roll and side seal that relatively rotated by two and can quickly be cooled down
In the molten bath that device is surrounded, molten steel solidifies to form solidified shell and be grown into the peripheral surface that crystallization roll rotates, and then two
The thick steel bands of 1-5mm are formed at the roll gap gap minimum of crystallization roll, steel band is via guide plate and is oriented to pinch roll and passes through rollgang
The strip of 0.7-2.5mm is rolled into feeding milling train, cooling device cooling is then passed through, finally sent after shear arrangement crop
Enter coiling machine to batch in rolls, wherein, two crystallization rolls to inlet of rolling mill are in lower confined chamber, it is characterised in that also included：
To the lower confined chamber injection liquid nitrogen, several leading to is evenly arranged on the surrounding wall of confined chamber under the thin strap continuous casting
The passage of lower confined chamber, is connected with liquid nitrogen in passage, passage starts to inject liquid in downward confined chamber in the hot charging process before casting
Nitrogen；
The liquid nitrogen flow in each passage is adjusted, the liquid nitrogen flow in each passage is 1-5m3/h；
Liquid nitrogen pressure in regulation injection channel, makes the liquid nitrogen pressure in injection channel be 0.1-0.3MPa；
Oxygen concentration to lower confined chamber carries out closed-loop control, and the injection rate of liquid nitrogen is adjusted by monitoring oxygen concentration, refers specifically to：It is logical
The oxygen content crossed in the lower confined chamber of the oxygen concentration instrument monitoring connected with lower confined chamber, regulation is injected into the liquid nitrogen in lower confined chamber
Amount, the liquid nitrogen flow in each passage is 1-5m3Ensure the oxygen concentration in lower confined chamber below 5% in the range of/h；
Closed-loop control is carried out to on-line rolling temperature, the porch before steel band feed mill (213) is provided with thermometer, and steel band is entered
Inlet temperature before milling train is monitored, by inlet temperature control in the range of 900-1150 DEG C：When inlet temperature is higher than
At 1150 DEG C, synthesized and coordinated by the liquid nitrogen injection rate and regulation casting rate that increase to lower confined chamber (210), make steel
1150 DEG C are less than with the inlet temperature before feed mill；When inlet temperature be less than 900 DEG C when, by under reduction to lower confined chamber
(210) liquid nitrogen injection rate and regulation casting rate is synthesized and coordinated, and makes the entrance before steel band feed mill be higher than 900 DEG C；
High density nitrogen excessive in confined chamber and the air of initial stage discharge under collecting.
2. the as claimed in claim 1 method for reducing closed room temperature under thin strap continuous casting, it is characterised in that：
The arrangement density of the passage is every square metre and sets 64-100, and the pipeline diameter of each passage is 10-20mm.
3. the as claimed in claim 1 method for reducing closed room temperature under thin strap continuous casting, it is characterised in that：
The implementation method for adjusting liquid nitrogen flow in each passage：The surrounding wall of the lower confined chamber is divided into five areas
Block：Antetheca, rear wall, left wall, right wall and pinch roll top；The liquid nitrogen input of the passage in each block is connected to a liquid
Nitrogen is in charge of, and the liquid nitrogen input that 5 liquid nitrogen are in charge of is connected on a liquid nitrogen house steward, and liquid nitrogen house steward be connected with liquid nitrogen source；Often
Root liquid nitrogen is in charge of and is disposed with a flow control valve, and the opening degree of each flow control valve is controlled by controller, realizes logical
Flow-rate adjustment in road.
4. the as claimed in claim 1 method for reducing closed room temperature under thin strap continuous casting, it is characterised in that：
The implementation method of liquid nitrogen pressure in the regulation injection channel：A pressure is provided between the liquid nitrogen house steward and liquid nitrogen source
Force regulating valve, realizes that the liquid nitrogen pressure in passage is adjusted by the pressure-regulating valve.
5. it is a kind of reduce thin strap continuous casting under closed room temperature device, it is included：Is loaded with molten steel in big bag (21), big bag (21) according to
The big bag long nozzle (22) of secondary successive connection, tundish (23) and flow distribution device (24) and one are relatively rotated by two and can
The molten bath (27) that the crystallization roll (25a, 25b) and lateral seal (26a, 26b) of quick cooling are surrounded, molten steel is in two crystallization rolls
The thick steel bands (211) of 1-5mm are formed at the roll gap gap minimum of (25a, 25b), steel band (211) is via guide plate (29) and is oriented to pinch
Roller (212) simultaneously enters milling train (213) by rollgang (215), the strip of 0.7-2.5mm is rolled into, through apparatus for supercooling
(214), then after shear arrangement (216) crop last feeding coiling machine (219,219 ＇) is batched in rolls, wherein, two crystallization rolls
(25a, 25b) is until milling train (213) entrance is in a lower confined chamber (210), it is characterised in that：
Several passages (28) for leading to lower confined chamber (210) are evenly arranged on the surrounding wall of the lower confined chamber (210), are led to
Road (28) is inner to be connected with liquid nitrogen；
The passage is provided with the flow regulator of regulation liquid nitrogen flow；
The passage is provided with the pressure-regulating device of liquid nitrogen pressure in regulation injection channel；
The lower confined chamber (210) connects an oxygen concentration instrument, and the oxygen concentration to lower confined chamber (210) carries out closed-loop control, root
The oxygen concentration monitored according to the oxygen concentration instrument adjusts the injection rate of liquid nitrogen, the liquid in each passage using the flow regulator
Nitrogen flow is 1-5m3Ensure the oxygen concentration in lower confined chamber below 5% in the range of/h；
Porch before steel band feed mill (213) is provided with thermometer, and the inlet temperature before steel band feed mill (213) is supervised
Survey, by inlet temperature control in the range of 900-1150 DEG C；
In lower confined chamber (210), gas collector (220) is set above, what the excessive high density nitrogen of collection and initial stage discharged
Air.
6. the as claimed in claim 5 device for reducing closed room temperature under thin strap continuous casting, it is characterised in that：
The arrangement density of the passage (28) is every square metre and sets 64-100, and the pipeline diameter of each passage is 10-20mm.
7. the as claimed in claim 6 device for reducing closed room temperature under thin strap continuous casting, it is characterised in that:
The flow regulator and pressure-regulating device refer to：The surrounding wall of the lower confined chamber (210) is divided into five areas
Block：Antetheca, rear wall, left wall, right wall and pinch roll (212) top；The liquid nitrogen input connection of the passage (28) in each block
It is in charge of to a liquid nitrogen, the liquid nitrogen input that 5 liquid nitrogen are in charge of is connected on a liquid nitrogen house steward, liquid nitrogen house steward and liquid nitrogen source
Connection；Every liquid nitrogen is in charge of and is disposed with a flow control valve as flow regulator, controls each to flow by controller
The opening degree of adjustable valve, realizes the Flow-rate adjustment in passage (28).
8. the as claimed in claim 7 device for reducing closed room temperature under thin strap continuous casting, it is characterised in that：
A pressure-regulating valve is provided between the liquid nitrogen house steward and liquid nitrogen source as pressure-regulating device, is adjusted by the pressure
Section valve realizes the liquid nitrogen pressure regulation in passage.
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| CN201410161630.7A CN105014021B (en) | 2014-04-22 | 2014-04-22 | The method and device of closed room temperature under a kind of reduction thin strap continuous casting |
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| CN201410161630.7A CN105014021B (en) | 2014-04-22 | 2014-04-22 | The method and device of closed room temperature under a kind of reduction thin strap continuous casting |
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| RU2722550C1 (en) * | 2017-02-23 | 2020-06-01 | Прайметалс Текнолоджис Джапан, Лтд. | Device for continuous casting of strip |
| CN108220670B (en) * | 2018-01-11 | 2020-01-21 | 中北大学 | Casting-rolling method and casting-rolling equipment for Cu-Ni-Si-Mg alloy plate strip |
| CN109351787B (en) * | 2018-12-19 | 2019-10-18 | 燕山大学 | A kind of cold-strip liquid nitrogen cold sperm intelligent control device |
| CN109731913B (en) * | 2019-02-21 | 2020-07-24 | 江苏沙钢集团有限公司 | Method for reducing rolling force of rolling mill of double-roller continuous casting production line |
| CN112522595B (en) * | 2019-09-19 | 2022-10-21 | 宝山钢铁股份有限公司 | High-strength thin-specification fire-resistant weather-resistant steel plate/steel belt and production method thereof |
| CN112522638B (en) * | 2019-09-19 | 2022-10-21 | 宝山钢铁股份有限公司 | Fire-resistant weather-resistant steel plate/belt and production method thereof |
| CN112522594B (en) * | 2019-09-19 | 2022-10-21 | 宝山钢铁股份有限公司 | Thin-specification fire-resistant weather-resistant steel plate/belt and production method thereof |
| CN110722117A (en) * | 2019-11-28 | 2020-01-24 | 沈阳航空航天大学 | Roller-belt type aluminum ingot continuous casting device and casting process |
| CN114985690B (en) * | 2022-05-27 | 2023-06-06 | 安徽安坤新材科技有限公司 | Cast rolling equipment for producing copper-aluminum composite board and cast rolling process thereof |
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| JP4542247B2 (en) * | 2000-08-08 | 2010-09-08 | キャストリップ・リミテッド・ライアビリティ・カンパニー | Strip continuous casting apparatus and method of using the same |
| US20090288798A1 (en) * | 2008-05-23 | 2009-11-26 | Nucor Corporation | Method and apparatus for controlling temperature of thin cast strip |
| CN102041367B (en) * | 2009-10-23 | 2012-09-19 | 宝山钢铁股份有限公司 | Manufacturing method of thin strip continuously cast and cold rolled non-oriented electrical steel |
| CN102796956B (en) * | 2012-08-31 | 2014-07-23 | 宝山钢铁股份有限公司 | High-strength thin band steel for cold forming and manufacturing method thereof |
| CN103667895B (en) * | 2012-08-31 | 2016-01-20 | 宝山钢铁股份有限公司 | A kind of manufacture method of cold formability high-strength thin strip steel |
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