CN212494543U - Hot rolling mill and hot rolling unit - Google Patents
Hot rolling mill and hot rolling unit Download PDFInfo
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- CN212494543U CN212494543U CN202021483425.XU CN202021483425U CN212494543U CN 212494543 U CN212494543 U CN 212494543U CN 202021483425 U CN202021483425 U CN 202021483425U CN 212494543 U CN212494543 U CN 212494543U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The utility model relates to a hot rolling mill, wherein a spraying position and a dust extraction position positioned at the downstream of the spraying position are arranged at the outlet of the rolling mill; atomizing nozzles are arranged above and/or below the strip steel operation channel at the spraying position; a dust exhaust pipe is arranged at the dust exhaust position, and an air exhaust opening of the dust exhaust pipe is positioned above the strip steel running channel. In addition, the hot rolling mill group is also related, and at least one hot rolling mill adopts the hot rolling mill. The utility model arranges the atomizing nozzle and the dust exhaust air pipe at the outlet of the rolling mill, atomized water sprayed by the atomizing nozzle is quickly evaporated after contacting with high-temperature flue gas, and the temperature of the flue gas can be reduced and the hot pressing can be reduced under the condition of avoiding obviously reducing the surface temperature of the steel plate, the flue gas volume is obviously reduced, and then the atomized water is collected and removed by the dust exhaust air pipe; by combining the atomizing nozzle with the dust exhaust pipe, the flue gas treatment capacity of the system can be effectively reduced, the designed treatment capacity of subsequent supporting facilities can be reduced, and the investment and the operation energy consumption of the hot rolling system can be remarkably reduced.
Description
Technical Field
The utility model belongs to the technical field of the metallurgical equipment, concretely relates to hot rolling mill and adopt hot rolling unit of this hot rolling mill.
Background
In the process of rolling the strip steel in a hot rolling production workshop of a steel enterprise, the temperature of the strip steel is very high (about 1000 ℃), and the strip steel and a roller rub at a high speed to generate a large amount of high-temperature dust-containing smoke at the rolling mill. The steel rolling process with relaxed requirement on the rolling temperature of the strip steel generally adopts a dust suppression mode of spraying water or atomized water, and water drops contact and agglomerate with dust particles in smoke and then fall to the surface of the strip steel to realize the effect of purifying the smoke. However, for some hot rolled products with very thin thickness, the requirement on the temperature of the strip steel in the rolling process is strict, and a large amount of water drops on the surface of the strip steel to reduce the temperature of the strip steel and influence the product quality, so that an external dust hood way is adopted, a top suction dust hood is arranged near the outlet or the inlet of a rolling mill, the top or the side part of the dust hood is connected with a dust removal pipeline, and the generated high-temperature dust-containing flue gas is collected by the dust hood and then is conveyed to a dust remover for purification and then reaches the standard to be discharged; because the dust hood is arranged outside the rolling mill, a large amount of ambient wild wind is inevitably mixed into the collected flue gas, so that the treatment air volume of purification facilities such as a dust remover is increased, and the initial investment and the operating cost of the system are high; meanwhile, in order to effectively control the overflowing smoke, the size of the external dust hood is large, a large space between the racks of the rolling mill is occupied, the dust hood needs to be removed firstly during equipment maintenance between the racks, and maintenance time and cost are increased.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a hot rolling mill and adopt hot rolling unit of this hot rolling mill can solve prior art's partial defect at least.
The utility model relates to a hot rolling mill, which comprises a rolling mill frame and a roller arranged on the rolling mill frame, wherein a spraying position and a dust extraction position are arranged at the outlet of the rolling mill; at the spraying position, atomizing nozzles are arranged above and/or below the strip steel operation channel and are connected with a water supply pipe and a medium gas supply pipe; a dust extraction air pipe is arranged at the dust extraction position, and an air extraction opening of the dust extraction air pipe is positioned above the strip steel running channel; and the dust extraction position is arranged at the downstream of the spraying position along the running direction of the strip steel.
In one embodiment, the dust extraction duct is embedded in the mill housing.
As one embodiment, a water supply pipe and a medium gas supply pipe above the strip steel running channel are arranged in the dust extraction air pipe.
The utility model discloses still relate to a hot rolling mill group, include along the many hot rolling mills that belted steel traffic direction arranged in proper order, at least one of them hot rolling mill adopts as above the hot rolling mill.
In one embodiment, the hot rolling mill train further includes a smoke treatment mechanism, and each of the dust exhaust ducts is connected to the smoke treatment mechanism.
As one embodiment, the soot treatment mechanism includes a dehydration unit and a dust removal unit arranged in this order in a soot flow direction.
As an embodiment, the dewatering unit comprises a cyclonic dewaterer.
As one embodiment, the dust removal unit includes a sintered plate dust remover.
The utility model discloses following beneficial effect has at least:
the utility model provides a hot rolling mill and hot rolling mill group, through arranging atomizing nozzle and dust exhaust tuber pipe in the rolling mill exit, the atomizing water of atomizing nozzle jetting evaporates fast with the high temperature flue gas contact back, under the condition of avoiding making the steel sheet surface temperature obviously reduce, can make flue gas temperature reduce, hot pressing reduce, the flue gas volume reduces remarkably, and hot pressing reduces, the dust-laden flue gas of volume reduction is got rid of by dust exhaust tuber pipe entrapment. By combining the atomizing nozzle with the dust exhaust air pipe, the flue gas treatment capacity of the system can be effectively reduced, and the designed treatment air capacity of subsequent supporting facilities is reduced, so that the investment and the operation energy consumption of the hot rolling system are remarkably reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a hot rolling mill according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a hot rolling mill train according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are described below clearly and completely, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Example one
As shown in fig. 1, an embodiment of the present invention provides a hot rolling mill 1, which includes a rolling mill frame 11 and a roller disposed on the rolling mill frame 11, wherein a spraying position and a dust extraction position are disposed at an outlet of the rolling mill; at the spraying position, atomizing nozzles 12 are arranged above and/or below the strip steel running channel, and the atomizing nozzles 12 are connected with a water supply pipe 3 and a medium gas supply pipe 4; a dust exhaust pipe 13 is arranged at the dust exhaust position, and an air exhaust opening of the dust exhaust pipe 13 is positioned above the strip steel running channel; and the dust extraction position is arranged at the downstream of the spraying position along the running direction of the strip steel.
The rolling stand 11 and the rolls are conventional devices in the art, and the specific structure and the arrangement structure of the rolls on the rolling stand 11 are not described herein. In the process of rolling the strip steel, dust source points are positioned at the contact parts of the upper and lower rollers and the strip steel 2, and high-temperature smoke is generated in an outlet area along with the high-speed movement of the strip steel 2, so that preferably, atomizing nozzles 12 are uniformly arranged above and below a strip steel operation channel, the atomizing nozzles 12 arranged above and below the strip steel operation channel firstly restrain and cool the high-temperature smoke, dust-containing gas after restraining and cooling is gathered to an outlet at the upper part of the strip steel along with the action of thermal buoyancy, is collected by an air suction opening 131, and is conveyed to a dust remover through a pipeline system to be purified and then is discharged.
It is understood that the dust extraction station is arranged downstream of the spray station, i.e. on the side of the spray station remote from the rolls.
Generally, an upper shell of the rolling stand 11 and an outlet-side strip steel operation channel are surrounded to form an upper outlet area, a lower shell of the rolling stand 11 and the outlet-side strip steel operation channel are surrounded to form a lower outlet area, and the upper outlet area and the lower outlet area form a rolling mill outlet area 100; typically, the upper outlet region and the lower outlet region are triangular regions. The atomizing nozzles 12 above the strip run channel are located in the upper outlet region, the suction openings 131 preferably also being located in the upper outlet region; the atomizing nozzles 12 below the strip run channel are located in the lower outlet region.
The atomizing nozzle 12 is a double-flow atomizing nozzle 12, water (tap water or purified water) is supplied to the atomizing nozzle 12 through the water supply pipe 3, and a medium gas is supplied to the atomizing nozzle 12 through the medium gas supply pipe 4, wherein the medium gas can be compressed air or nitrogen; the superfine atomized water is generated through the interaction between the air and the water, the atomized water has the function of not generating a purification effect on the flue gas, but mainly can be quickly evaporated after being contacted with the high-temperature flue gas, so that the temperature of the flue gas is reduced, the hot pressing is reduced, the volume of the flue gas is remarkably reduced, and the diffusion effect of the flue gas is remarkably weakened.
The hot rolling mill 1 provided by the embodiment arranges the atomizing nozzles 12 and the dust exhaust air pipes 13 at the outlet of the rolling mill, atomized water sprayed by the atomizing nozzles 12 is rapidly evaporated after contacting with high-temperature flue gas, so that the temperature of the flue gas can be reduced, the hot pressure can be reduced under the condition of avoiding obviously reducing the surface temperature of the strip steel 2, the volume of the flue gas is obviously reduced, and the dust-containing flue gas with reduced hot pressure and reduced volume is collected and removed by the dust exhaust air pipes 13. By combining the atomizing nozzle 12 with the dust exhaust air pipe 13, the flue gas treatment capacity of the system can be effectively reduced, and the designed treatment air capacity of subsequent supporting facilities can be reduced, so that the investment and the operation energy consumption of the hot rolling system can be remarkably reduced.
Further preferably, the atomizing nozzles 12 are adapted to vaporize all or most of the sprayed atomized water droplets by the high temperature flue gas, if the particle size of the sprayed water droplets is too large, some or a large amount of water droplets are likely to fall onto the surface of the strip steel 2 without being vaporized completely, so that the temperature of the strip steel is reduced too much, and the quality of the rolled product is affected; if the particle size of the sprayed water drops is too small, the effects of reducing the smoke temperature, hot pressing and smoke volume are relatively poor. The atomization parameters such as the atomized water amount and the water drop particle size sprayed by the atomization nozzle 12 can be calculated and determined through numerical simulation calculation software according to parameters of hot rolling process products, specifically, the atomization parameters of the atomization nozzle 12 are determined by adopting the following method, and the atomization parameters comprise the initial water mist particle size, the water spray amount, the spray angle and the arrangement position of the atomization nozzle 12:
s1, establishing a geometric model according to the outlet area of the rolling mill, arranging the air suction opening 131 at a preset position, and performing mesh division on the outlet area of the rolling mill by using preprocessing software;
s2, setting initial conditions, wherein the initial conditions comprise the surface temperature of the strip steel and dust source points; performing numerical simulation calculation of a continuous phase by solving a Reynolds average Navistokes equation, opening a DPM (differential Power model) after the calculation of the continuous phase reaches convergence, adding preset atomization parameters, and performing iteration of a discrete phase;
s3, after the calculation in S2 reaches convergence, analyzing the evaporation movement time of the water mist under the preset atomization parameters and the influence of the water mist on the high-temperature flue gas flow field, judging whether the preset atomization parameters are proper or not, if not, adjusting the atomization parameters, and performing the numerical simulation calculation in S2 again until the proper atomization parameters are obtained; wherein, the proper atomization parameter needs to reach the cooling target of the high-temperature flue gas flow field, and the vaporization quantity of the sprayed atomized water is in the target range; that is, when the expected cooling effect of the high-temperature flue gas flow field is obtained, all or most (more than 92 percent) of the sprayed atomized water is vaporized by the high-temperature flue gas, and the quality of the hot-rolled product is not influenced. In the numerical simulation, a turbulence model selects a readable k-epsilon model, a pressure velocity coupling term selects a PISO iterative algorithm, a momentum and energy equation adopts a second-order windward format, and turbulence kinetic energy and turbulence dissipation rate adopt a first-order windward format; the selected injection mode in the DPM model is a hollow conical nozzle, the particle type is Droplet, the material is liquid water, and the evaporation phase is H2O。
After the numerical simulation calculation, the proper atomizing nozzles 12 are selected according to the determined water drop particle size, and the number and the arrangement positions of the nozzles are determined according to the required total water spraying amount and the spatial characteristics of the outlet area 100 of the rolling mill.
Further optimizing the above embodiment, the dust exhaust duct 13 needs to be well matched with the atomizing nozzle 12, if the position of the air exhaust opening is too close to the atomizing nozzle 12, or the air quantity of the air exhaust opening is too large and the air speed of the air opening is too high, the flow field for spraying the atomized water is seriously affected, and the sprayed atomized water drops are greatly sucked away, so that the required flue gas cooling effect cannot be achieved; however, the closer the suction opening is to the mill exit (i.e., the closer to the exit end of the mill exit area 100, or the closer to the outside of the mill), the greater the flow rate of the opening required to effectively control the trapped flue gas, the greater the required suction capacity. In this embodiment, the dust extraction parameters are determined by the following method, and the dust extraction parameters include the air extraction rate, the size of the air extraction opening, and the relative position between the air extraction opening 131 and the atomizing nozzle 12:
step one, after the atomization parameters are determined, giving a speed outlet boundary condition to the air suction opening 131, performing numerical simulation calculation of a continuous phase by solving a Reynolds average Navigneaux equation, opening a DPM (differential pulse-width modulation) model after the continuous phase calculation reaches convergence, adding the determined atomization parameters, and performing discrete phase calculation;
step two, after calculation convergence, analyzing the flue gas flow field condition in the outlet area of the rolling mill, judging whether the given dust extraction parameters are appropriate, if not, adjusting the dust extraction parameters (such as adjusting the flow rate of an extraction opening, the distance between the extraction opening 131 and the atomizing nozzle 12 and the like), and performing numerical simulation calculation in the step one again until the appropriate dust extraction parameters are obtained; in the numerical simulation, a turbulence model selects a readable k-epsilon model, a pressure velocity coupling term selects a PISO iterative algorithm, a momentum and energy equation adopts a second-order windward format, and turbulence kinetic energy and turbulence dissipation rate adopt a first-order windward format; the selected injection mode in the DPM model is a hollow conical nozzle, the particle type is Droplet, the material is liquid water, and the evaporation phase is H2And O. The turbulence model is selected from a Realizblek-epsilon model mainly because the smoke temperature of simulation calculation is very high, the buoyancy effect of the smoke cannot be ignored, and the motion rule of the smoke is close to that of high-temperature float jet.
It should be understood that the numerical simulation calculation of the dust extraction parameter is also performed based on the geometric model of the outlet area of the rolling mill established in S1 in the numerical simulation calculation of the atomization parameter, and the meshing of the outlet area of the rolling mill by using preprocessing software.
Whether the dust extraction parameters are suitable or not is judged mainly by: if the numerical simulation calculation result shows that a large amount of water drops are sucked away along with the smoke, or a large amount of smoke escapes without being trapped by the suction opening 131, the set suction opening position and the set smoke flow rate parameter of the suction opening are not appropriate; and vice versa. The flow rate of the smoke in the air suction opening is preferably that the smoke in the outlet area 100 of the rolling mill can be completely or nearly completely (more than 95 percent of the smoke containing dust is collected); the flow rate of the smoke in the suction opening is related to the position of the suction opening 131, and the flow rate of the smoke in the suction opening can be calculated according to the determined flow rate of the smoke in the suction opening and the area of the suction openingThe air suction volume is obtained. For example, the position of the air suction opening determined by the numerical simulation trial calculation of the process parameters of a certain hot rolled strip production line is arranged in the range of about 30-60 cm (two to three rows of air suction openings 131 can be arranged in the range of the area) from the outer edge of the outlet of the rolling mill in the outlet area 100 of the rolling mill, and the distance between the air suction opening 131 and the atomizing nozzle 12 is about 60 cm; the total air draft of each rolling mill design is about 3 ten thousand meters3And h, the sprayed atomized water is slightly influenced, the high-temperature smoke of the rolling mill is effectively controlled, most of the smoke is collected by the air suction opening 131, and no obvious smoke overflows.
The structure of the hot rolling mill 1 is further optimized, and as shown in fig. 1, the dust exhaust duct 13 is embedded in the mill housing 11. By integrally designing the dust exhaust air pipe 13 and the rolling mill stand 11, the arrangement of the dust exhaust air pipe 13 does not occupy the peripheral space of the rolling mill, thereby facilitating the management of equipment and the daily maintenance work of the rolling mill. In a further preferred embodiment, as shown in fig. 1, the water supply pipe 3 and the medium gas supply pipe 4 are both arranged from the inside of the dust exhaust duct 13; optionally, pipeline facilities such as a hydraulic oil pipe of the rolling mill and the like can also be arranged from the dust extraction air pipe 13; based on the structure, the hot rolling high-temperature flue gas is removed, the size of the shell of the rolling mill is prevented from being greatly increased, and the arrangement of each pipeline facility is convenient.
Example two
As shown in fig. 2, the embodiment of the present invention provides a hot rolling mill train, which comprises a plurality of hot rolling mills 1 sequentially arranged along the running direction of the strip steel, wherein at least one of the hot rolling mills 1 adopts the hot rolling mill 1 provided by the first embodiment. Preferably, the hot rolling mill 1 provided in the first embodiment is used for each hot rolling mill 1, and the specific structure of the hot rolling mill 1 is not described herein.
Furthermore, the hot rolling mill unit also comprises a smoke treatment mechanism, and each dust extraction air pipe 13 is connected with the smoke treatment mechanism. In the present embodiment, preferably, as shown in fig. 2, the smoke processing mechanism comprises a dehydration unit 52 and a dust removal unit 53 which are arranged in sequence along the smoke flowing direction, wherein the dehydration unit 52 and the dust removal unit 53 are connected through a conveying air pipe 51. A small part of atomized water drops can be caught by the dust extraction port; meanwhile, in the long-distance conveying process of the outdoor air pipe, the vaporized water contained in the flue gas can be analyzed in the middle of the conveying air pipe 51 along with the reduction of the temperature of the flue gas, and is adsorbed and polymerized with dust particles in the flue gas to form dust-containing water drops, and when the conditions are serious, a large amount of dust-containing water drops cannot be taken away by the air flow and settle at the bottom of the conveying air pipe 51 to form dust mud and gradually increase, so that the large-area blockage inside the conveying air pipe 51 is caused, even the conveying air pipe 51 collapses, and safety accidents occur; the dehydration unit 52 is used for removing water drops in the flue gas and ensuring the safe and stable operation of the conveying air pipe 51. In one embodiment, the dewatering unit 52 includes a cyclone dewaterer 52, which has a better effect of removing water droplets from the flue gas, and the fine liquid droplets contained in the flue gas after being treated by the cyclone dewaterer 52 can be largely removed. The cyclone dehydrator 52 is an existing device, specifically, a fixed cyclone sheet and a first washing unit 521 are arranged inside the cyclone dehydrator 52, when smoke passes through the cyclone sheet, a cyclone effect is generated, the contained fine dust-containing water drops partially collide on the cyclone sheet and are gathered into larger liquid drops, the remaining fine dust-containing water drops move to the inner wall of the dehydrator under the action of centrifugal force and are gathered into larger liquid drops, and the larger liquid drops formed by the two parts are both deposited and gathered to the bottom of the dehydrator and are discharged to a sewage system through a sewage discharge pipe 522 for treatment; the first flushing unit 521 can flush the interior of the cyclone dehydrator 52, thereby ensuring stable and reliable operation of the cyclone dehydrator 52.
Further preferably, as shown in fig. 2, a second flushing unit 54 is disposed on the conveying air pipe 51, a water discharge branch pipe 55 is correspondingly disposed downstream of the second flushing unit 54, if a large area of dust and mud deposition occurs in the conveying air pipe 51, flushing can be performed by the second flushing unit 54, and flushing sewage is discharged to a sewage system for treatment through the water discharge branch pipe 55. The second flushing unit 54 comprises a flushing water branch 54 which is connected next to the conveying air line 51, a flushing valve which is arranged on the flushing water branch 54, and a flushing nozzle which is arranged on the flushing water branch 54 and is located in the conveying air line 51. Accordingly, the air duct 51 may be correspondingly provided with inspection holes, and the deposition of the condensed water or the dust and mud inside the air duct 51 may be periodically or aperiodically inspected. In an alternative embodiment, as shown in fig. 2, the second washing unit 54 is located between the dewatering unit 52 and the dust removing unit 53.
Further preferably, the conveying air pipe 51 has a certain gradient, and the gradient is towards the dust removal unit 53, so that condensed water deposited in the conveying air pipe 51 can be removed in time; accordingly, a drain unit may be disposed at the inlet side of the dust removing unit 53, and particularly, the above-described drain branch pipe 55 may simultaneously serve as a drain unit when the above-described second washing unit 54 is located between the dehydrating unit 52 and the dust removing unit 53. In this embodiment, the gradient of the delivery duct 51 is not less than 0.003.
As for the dust removing unit 53 described above, a dust removing device is generally applicable to the present embodiment. Preferably, the dust removing unit 53 comprises a sintered plate dust remover 53, the sintered plate dust remover 53 is an existing device, and is formed by sintering multiple high polymer compound powders and a special binder, and has the characteristic of strong humidity resistance, so that even if part of vaporized water contained in flue gas is separated out in the dust remover, the dust removing and purifying effect is not influenced, and the phenomenon that a traditional bag-type dust remover is easy to cause bag bonding is avoided.
The flue gas at the outlet of the dust removing unit 53 reaches the emission standard, and can be discharged outside through a dust removing fan 56 and a chimney 57, and a silencer 58 can be further arranged to improve the environmental protection.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A hot rolling mill comprising a roll stand and rolls arranged on said roll stand, characterized in that: a spraying position and a dust extraction position are arranged at the outlet of the rolling mill; at the spraying position, atomizing nozzles are arranged above and/or below the strip steel operation channel and are connected with a water supply pipe and a medium gas supply pipe; a dust extraction air pipe is arranged at the dust extraction position, and an air extraction opening of the dust extraction air pipe is positioned above the strip steel running channel; and the dust extraction position is arranged at the downstream of the spraying position along the running direction of the strip steel.
2. The hot rolling mill of claim 1, wherein: the dust exhaust air pipe is embedded in the rolling mill frame.
3. The hot rolling mill of claim 2, wherein: and a water supply pipe and a medium gas supply pipe above the strip steel operation channel are arranged in the dust extraction air pipe.
4. The utility model provides a hot rolling mill group, includes a plurality of hot rolling mills that arrange in proper order along belted steel traffic direction, its characterized in that: at least one of the hot rolling mills employs the hot rolling mill of any one of claims 1 to 3.
5. The hot rolling mill train of claim 4, wherein: the dust exhaust device is characterized by further comprising a smoke dust treatment mechanism, and each dust exhaust pipe is connected with the smoke dust treatment mechanism.
6. The hot rolling mill train of claim 5, wherein: the smoke dust treatment mechanism comprises a dehydration unit and a dust removal unit which are sequentially arranged along the smoke dust flowing direction.
7. The hot rolling mill train of claim 6, wherein: the dehydration unit comprises a cyclone dehydrator.
8. The hot rolling mill train of claim 6, wherein: the dust removal unit comprises a sintering plate dust remover.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111744956A (en) * | 2020-07-24 | 2020-10-09 | 中冶南方工程技术有限公司 | Hot rolling mill and hot rolling unit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111744956A (en) * | 2020-07-24 | 2020-10-09 | 中冶南方工程技术有限公司 | Hot rolling mill and hot rolling unit |
| CN111744956B (en) * | 2020-07-24 | 2024-04-16 | 中冶南方工程技术有限公司 | Hot rolling mill and hot rolling unit |
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