CN107497852A - A kind of steel exempt from heating rolling system and method - Google Patents
A kind of steel exempt from heating rolling system and method Download PDFInfo
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- CN107497852A CN107497852A CN201710914993.7A CN201710914993A CN107497852A CN 107497852 A CN107497852 A CN 107497852A CN 201710914993 A CN201710914993 A CN 201710914993A CN 107497852 A CN107497852 A CN 107497852A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/466—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a kind of steel to exempt from heating rolling system and method, and the system includes the conticaster, the fast hydraulic pressure that closely set successively and cuts, strand Cryocooler Temperature Closed Loop Control System, cuts rear roller-way, stay-warm case, strand stream convergence roller-way, transport hot sending roller-way, ferrous rolling mill, automatic Control System of Rolling Mill；The stay-warm case is arranged on and cuts rear roller-way, transport is heat-fed on roller-way；The strand stream convergence roller-way converges to the strand in every one stream on transport hot sending roller-way, and the strand stream convergence roller-way is 3 5m/s with transport hot sending roller table speed.Temperature is more than 980 DEG C before controlling strand cutting by strand Cryocooler Temperature Closed Loop Control System, and during the high temperature strand after shearing is delivered to steel rolling rolling by convergence at a high speed, temperature loss is controlled in the range of less than 15 DEG C.The present invention can effectively reduce the reduction of strand temperature, strand is met the temperature requirement of steel rolling, while realize the Automated condtrol of production line, reduce production cost, improve productivity effect.
Description
Technical field
The present invention relates to steel rolling neighborhood, specially a kind of steel exempt from heating rolling system and method.
Background technology
Heating furnace in hot rolling is energy resource consumption and the higher position of pollutant emission in steel production, although unit energy
Consumption is declining year by year, but continues to use traditional handicraft and be still unable to reach the target for significantly saving the energy.In order to be produced in steel
Energy-conservation, emission reduction, cost declining are realized in journey, people turn to sight the reasonable utilization of continuous casting billet waste heat.Pouring molten steel is to crystallizer
After being frozen into steel billet, partial heat is taken away by the cooling water of crystallizer and two cold-zones, but still has substantial amounts of waste heat to stay in continuous casting billet
In.How this part of waste heat is used, people have ever done many trials, and exempt from heating technique and meet the tendency of in this case
And give birth to.
Bar Wire Product exempts from heating rolling (DROF, Direct Rolling of Free-heating for Bar and Rod)
The main points of new technology are reasonable raising strand temperature, and after high temperature strand is cut off, the quick roller-way through specially laying is sent directly into
Rolling line is rolled.During using DROF techniques, strand is without heating furnace, also without concurrent heating, the completely left out fuel of heating furnace
Consumption, the energy can be significantly saved, reduce the discharge of the pollutants such as carbon dioxide.
The problem of currently available technology is present is mainly the not comprehensive and imperfection of strand temperature raising and heat preservation technology, and strand rolls
Temperature does not reach requirement before system, and whole rolling line not yet realizes Automated condtrol.
The content of the invention
In view of this, a kind of steel of present invention offer exempt from heating rolling system and method, and the system includes closely setting successively
Conticaster, the fast hydraulic pressure put are cut, strand Cryocooler Temperature Closed Loop Control System, cut rear roller-way, stay-warm case, strand stream convergence roller-way, fortune
Defeated hot sending roller-way, ferrous rolling mill, automatic Control System of Rolling Mill；The stay-warm case, which is arranged on, cuts rear roller-way, transport hot sending roller-way
On；The strand stream convergence roller-way converges to the strand in every one stream on transport hot sending roller-way, the transport hot sending roller-way speed
Spend for 3-5m/s, by temperature before the control strand cutting of strand Cryocooler Temperature Closed Loop Control System more than 980 DEG C, the high temperature after shearing
Strand is delivered in the steel rolling operation of rolling by convergence and conveying at a high speed, and temperature loss is controlled in the range of less than 15 DEG C.
To solve above technical problem, technical solution of the present invention exempts from heating rolling system to employ a kind of steel, and it is special
Sign is, including the conticaster, the fast hydraulic pressure that closely set successively are cut, strand Cryocooler Temperature Closed Loop Control System, cut rear roller-way, insulation
Cover, strand stream convergence roller-way, transport hot sending roller-way, ferrous rolling mill, automatic Control System of Rolling Mill；The stay-warm case, which is arranged on, to be cut
Roller-way, transport are heat-fed on roller-way afterwards；The strand stream convergence roller-way converges to the strand in every one stream on transport hot sending roller-way.
Preferably, the strand Cryocooler Temperature Closed Loop Control System includes industrial computer, industrial computer system software, temperature measuring equipment, cold
But water lines, valve, nozzle.
Preferably, the strand Cryocooler Temperature Closed Loop Control System also include casting blank surface temperature Survey Software, shell thickness and
Coagulated hemothorax software of forecasting, two cold-zone water distribution optimization softwares, data processing and Archive Software, human interface software.
Preferably, the stay-warm case includes structure sheaf, heat-insulation layer, reflecting layer and connection member.
Preferably, strand stream convergence roller-way is in narrow horn-like in the wide downstream in upstream.
Preferably, the strand stream convergence roller-way and transport hot sending roller table speed are 3-5m/s.
Preferably, the automatic Control System of Rolling Mill includes PLC group, HPC controllers group, milling train scene
Console, real-time data acquisition system, system development and debugging computer system and Basic automation control system network.
The present invention also provides a kind of steel and exempts from heating rolling method, exempts from heating rolling system using above-mentioned steel, its feature
It is：The strand that conticaster is produced delivers to strand stream convergence roller-way, strand after rapid hydraulic cutting is cut by roller-way after cutting
Transport hot sending roller-way is converged at a high speed through strand stream convergence roller-way, and is fed rapidly into strand single current by transport hot sending roller-way
Milling train is carried out exempting from heating rolling, and the wherein temperature raising of strand is controlled with insulation using strand Cryocooler Temperature Closed Loop Control System, steel rolling
Controlled using automatic Control System of Rolling Mill and flying shear control system.
Preferably, temperature is more than 980 DEG C before controlling strand cutting by strand Cryocooler Temperature Closed Loop Control System, the height after shearing
Warm strand is delivered in the steel rolling operation of rolling by convergence and conveying at a high speed, and temperature loss is controlled in the range of less than 15 DEG C.
The present invention can effectively reduce the reduction of strand temperature, strand is met the temperature requirement of steel rolling, realize simultaneously
The Automated condtrol of production line, production cost is reduced, improve productivity effect.
Illustrate Fig. 1, strand temperature scaling factor schematic diagram；
Fig. 2, heat insulation cover structure figure；
Fig. 3, exempt from heating rolling system flow chart；
Fig. 4, exempt from heating rolling system structure diagram.
Embodiment
In order that those skilled in the art more fully understands the technical scheme of invention, with reference to embodiment pair
The present invention is described in further detail.
Can heating rolling technique be exempted from smoothly realize, key is continuously casting part, at present people's grinding for continuous casting
It is more to study carefully comparison.Have according to the order of power consumption from high to low：CCR ＞ HCR ＞ DHCR ＞ DROF.The charging temperature of usual CCR techniques
For normal temperature, the charging temperature of HCR techniques is 40-700 DEG C, and the charging temperature of DHCR techniques is more than 700 DEG C, and DROF techniques are not
Heated stove Direct Rolling, start rolling temperature is between pair rolling and zerolling, by taking some technological measures, can make company
The center portion temperature of strand is more than 1000 DEG C
The essential characteristic of DROF technologies is as follows：1) start rolling temperature is between pair rolling and zerolling, finishing temperature with
Pair rolling is more or less the same；2) central temperature of workpiece is high, and surface temperature is low, is advantageous to deform deep and thorough；3) because reaching cut-out point
Time it is different, strand head temperature is low, and rear end temperature is high；4) by throwing rate limitation, the speed of service is low before strand cut-out, cuts
Having no progeny has the possibility of speed-raising；5) roll-force of roughing mills has raised than pair rolling.
These characteristics for DROF technologies using following key technology, it is necessary to ensure being smoothed out for production：1) even
The guarantee technology of strand and stocking temperature, by taking two cold water distributions of optimization, shortening continuous casting to the measures such as the convergence time of rolling,
Ensure that strand has higher start rolling temperature；2) the guarantee technology of continuous casting billet and mill bar quality, for the high outer low spy of the strand temperature heart
Point, take corresponding control of product quality technology；3) steel-smelting continuous casting-steel rolling integration production management technology；4) technique is ensured
With stabilization of equipment performance and reliability engineering etc..
The invention provides a kind of steel to exempt from heating rolling system and method, and the system includes the continuous casting closely set successively
Machine, fast hydraulic pressure are cut, strand Cryocooler Temperature Closed Loop Control System, cut rear roller-way, stay-warm case, strand stream convergence roller-way, transport hot sending roller
Road, ferrous rolling mill, automatic Control System of Rolling Mill；The stay-warm case is arranged on and cuts rear roller-way, transport is heat-fed on roller-way；The casting
Base stream converges roller-way and converges to the strand in every one stream on transport hot sending roller-way, the strand stream convergence roller-way and transport hot sending
Roller table speed is 3-5m/s, and temperature is more than 980 DEG C, after shearing before controlling strand cutting by strand Cryocooler Temperature Closed Loop Control System
High temperature strand is delivered in the steel rolling operation of rolling by convergence and conveying at a high speed, and temperature loss is controlled in the range of less than 15 DEG C.This
Invention can effectively reduce the reduction of strand temperature, strand is met the temperature requirement of steel rolling, while realize oneself of production line
Dynamicization controls, and reduces production cost, improves productivity effect.
Above-mentioned elaborating for the present invention, is the embodiment of the present invention below.
Embodiment one
Strand Cryocooler Temperature Closed Loop Control System
Its composition is as follows
1) hardware configuration of strand temperature control system：Industrial computer 1 (containing main frame, display, communication card etc.), thermometric dress
1 set is put, cooling water pipeline, valve, nozzle etc. can utilize original system；
2) software merit rating：In addition to industrial computer system software, one constructed based on finite element result is equipped with
Serial mathematical modeling, it is excellent for casting blank surface temperature Survey Software, shell thickness and Coagulated hemothorax software of forecasting, two cold-zone water distributions
Change software, data processing and Archive Software, human interface software etc..
The optimum results of two cold-zone water distributions are converted into regulation cooling water by the present apparatus using TCB Ver.2.X through mathematical modeling
The controlled quentity controlled variable of valve, realize automatically controlling for strand temperature.Strand temperature safely can be improved 50-150 DEG C by the system.
Its control principle is as shown in figure 1, main points are as follows：
1) concept of safe distance is introduced, the referred to as safe distance the distance between from Coagulated hemothorax to strand cut-out point.
Using the finite element numerical simulation to process of setting, safe distance predictive mathematical model is established, to ensure that bleed-out accident does not occur,
Safe distance at least should be greater than 0.5m；
2) according to the requirement of safe distance, the mathematical modeling using cooling water parameter to strand Influence of Temperature Field, by calculating
Machine sets out initial intensity of cooling and cooling water valve configuration；
3) temperature measurer on-line real-time measuremen casting blank surface temperature is utilized, the temperature of observed temperature and computer settings is carried out
Compare, if the difference of observed temperature and design temperature is more than given permissible value, to intensity of cooling and cooling water valve group
State is adjusted in real time；
If 4) observed temperature is less than permissible value, illustrate that strand temperature is relatively low, it is impossible to meet the requirement of rolling, it is desirable to reduce
Intensity of cooling, while check safe distance；
If 5) observed temperature is higher than permissible value, illustrate that strand temperature is too high, it may appear that bleed-out danger is, it is necessary to increase cooling
Intensity, while check safe distance；
6) said process repeats, it is ensured that strand temperature is maintained in allowed band, and bleed-out thing now will not both occur
Therefore also strand temperature can be made to meet rolling requirements.
Embodiment two
Heat insulation cover structure is made up of structure sheaf (4) heat-insulation layer (3) reflecting layer (6) as shown in Figure 2, by bolt (5) and even
Lug (7) connection shaping, is covered on roller-way (1) and strand (2), and structure sheaf and reflecting layer be high carbon steel sheet, can for 60,65,
The heat that strand discharges can be reflected back strand by the 70th, 75, No. 80 steel, reflecting layer, and heat-insulation layer is to be incubated cotton material, engaging lug (7)
It coincide and is connected with the connection member on roller-way cover plate.Rear roller-way and transport hot sending roller-way are cut in use, stay-warm case is covered in
On, it can effectively slow down the reduction of strand temperature.
Embodiment three
Steel of the present invention exempt from the real-time mode of heating rolling system as shown in Figure 3, Figure 4, the strand that conticaster is produced
Strand stream convergence roller-way (12) is delivered to by cutting rear roller-way (7) after fast hydraulic pressure cuts (6) cutting, strand converges roller-way through strand stream
Transport hot sending roller-way (8) is converged at a high speed, and strand single current is fed rapidly into milling train (10) by transport hot sending roller-way and carried out
Exempt from heating rolling, milling train is controlled (9) by automatic Control System of Rolling Mill.Strand is by cooling zone (1), its wick-containing (2) and green shell
(3) composition changes, and completely after solidification, reaches hydraulic shear (7) through one section of safe distance (4) and is cut off, this stage
Temperature control be controlled by strand Cryocooler Temperature Closed Loop Control System (14), make strand temperature be more than 980 DEG C.Cut rear roller-way (7)
It is heat-fed with transport on roller-way (8) covered with stay-warm case (11,13).
High speed strand stream convergence roller-way (12) group is in horn-like, is become narrow gradually by upstream to downstream, can be by every one stream
Strand pools single current at a high speed, is transported on rapid transit hot sending roller-way (8), and strand converges at a high speed, non-slip, not jam, casting
The speed that base stream converges roller-way and transport hot sending roller-way is 3-5m/s, improves transporting velocity, can slow down strand during transport
Heat scatters and disappears.And strand roller-way (7) region after cutting is more and come together, and strand is sent into high speed strand stream in groups
During convergence roller-way (12) and on high speed strand stream convergence roller-way (12) strand be also more in groups, so also may be used
So that strand cooling is slow, temperature loss is reduced, ensures temperature during follow-up rolling.
Automatic Control System of Rolling Mill include PLC group, milling train field control station, real-time data acquisition system,
System development and debugging computer system and Basic automation control system network.Computer system includes rolling line setting system
Speed is closed between system, the starting of milling train and stopping initialization system, rolling line speed cascade system, speed adaptive initialization system, frame
Be adjustment system, automatic loop control system, Minimal Tension automatic control system, impact velocity (dynamic speed drop) compensation system,
Rolled piece tracks end to end and fault detection system.The system can reach high speed communication, the effect of High-speed Control.
Exempt from heating rolling system and method using above-mentioned steel, its every production target is as shown in the table
The steel of table 1 exempt from heating rolling production line correlation operating index
According to upper table data, what is used in the present invention exempts from heating rolling system and method, and temperature is more than before strand cutting
980 DEG C, high temperature strand after shearing is delivered in the steel rolling operation of rolling by convergence and conveying at a high speed, temperature loss control less than
In the range of 15 DEG C, steel billet start rolling temperature is controlled in the range of 980 ± 15 DEG C, can reach the effect for delaying strand temperature to reduce,
Strand is set to meet rolling requirements.This production line is used simultaneously, for year output up to 1,100,000 tons/year, year can reduce gas cost
257.1 ten thousand yuan, year economic benefit do not only reached the purpose of energy-saving and emission-reduction up to 8,750,000 yuan, and greatly reduce cost,
Improve benefit.
It the above is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred embodiment is not construed as pair
The limitation of the present invention, protection scope of the present invention should be defined by claim limited range.For the art
For those of ordinary skill, without departing from the spirit and scope of the present invention, some improvements and modifications can also be made, these change
Enter and retouch and also should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of steel exempt from heating rolling system, it is characterised in that conticaster, fast hydraulic pressure including closely setting successively cut,
Strand Cryocooler Temperature Closed Loop Control System, cut rear roller-way, stay-warm case, strand stream convergence roller-way, transport hot sending roller-way, ferrous rolling mill, roll
Machine automation control system；The stay-warm case is arranged on and cuts rear roller-way, transport is heat-fed on roller-way；The strand stream convergence roller-way will
Converged to per the strand in one stream on transport hot sending roller-way.
2. steel according to claim 1 exempt from heating rolling system, it is characterised in that the strand temperature scaling factor system
System includes industrial computer, industrial computer system software, temperature measuring equipment, cooling water pipeline, valve, nozzle.
3. steel according to claim 2 exempt from heating rolling system, it is characterised in that the strand temperature scaling factor system
System also includes casting blank surface temperature Survey Software, shell thickness and Coagulated hemothorax software of forecasting, two cold-zone water distribution optimization softwares, number
According to processing and Archive Software, human interface software.
4. steel according to claim 1 exempt from heating rolling system, it is characterised in that the stay-warm case include structure sheaf,
Heat-insulation layer, reflecting layer and connection member.
5. steel according to claim 1 exempt from heating rolling system, it is characterised in that the strand stream convergence roller-way is presented
Swim narrow horn-like in wide downstream.
6. steel according to claim 1 exempt from heating rolling system, it is characterised in that：The strand stream convergence roller-way and fortune
Defeated hot sending roller table speed is 3-5m/s.
7. steel according to claim 1 exempt from heating rolling system, it is characterised in that the automatic Control System of Rolling Mill
Including PLC group, milling train field control station, real-time data acquisition system, system development and debugging computer system with
And Basic automation control system network.
8. a kind of steel exempt from heating rolling method, exempt from heating rolling using a kind of steel described in claim 1-7 any one
System, it is characterised in that：The strand that conticaster is produced is delivered to strand stream by roller-way after cutting after rapid hydraulic cutting is cut and converged
Poly- roller-way, strand converge roller-way through strand stream and converge to transport hot sending roller-way at a high speed, and by transporting hot sending roller-way by strand single current
Ground is fed rapidly into milling train and carries out exempting from heating rolling, and the wherein temperature raising of strand uses strand Cryocooler Temperature Closed Loop Control System control with insulation
System, steel rolling are controlled using automatic Control System of Rolling Mill.
9. a kind of steel according to claim 8 exempt from heating rolling method, it is characterised in that：Pass through strand temperature closed loop control
Temperature is more than 980 DEG C before system control strand cutting processed, and the high temperature strand after shearing delivers to steel rolling by convergence and conveying at a high speed
In the operation of rolling, temperature loss is controlled in the range of less than 15 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710914993.7A CN107497852A (en) | 2017-09-30 | 2017-09-30 | A kind of steel exempt from heating rolling system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710914993.7A CN107497852A (en) | 2017-09-30 | 2017-09-30 | A kind of steel exempt from heating rolling system and method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108356076A (en) * | 2018-01-18 | 2018-08-03 | 河钢股份有限公司承德分公司 | A kind of continuous casting billet milling method |
| CN109530646A (en) * | 2018-12-27 | 2019-03-29 | 钢铁研究总院 | For reducing the control method of head and tail temperature difference before direct rolling process continuous casting billet rolls |
| CN110421002A (en) * | 2019-07-08 | 2019-11-08 | 江苏煌明能源科技有限公司 | Bar Wire Product is without heating furnace continuous casting direct-rolling process |
| CN111069553A (en) * | 2019-12-16 | 2020-04-28 | 武汉科技大学 | Quality improvement method of continuous casting billet |
| CN112845630A (en) * | 2020-12-31 | 2021-05-28 | 南京净环热冶金工程有限公司 | Online heat preservation and heat supplement method for continuous casting billet |
| CN113564360A (en) * | 2021-08-18 | 2021-10-29 | 宁夏森源重工设备有限公司 | Hot charging and hot conveying equipment for large-scale silicomanganese ore heating furnace and manufacturing process thereof |
| CN114713631A (en) * | 2022-05-18 | 2022-07-08 | 首钢长治钢铁有限公司 | Rolling production system integration |
| CN114850228A (en) * | 2022-04-26 | 2022-08-05 | 广东韶钢松山股份有限公司 | Control method and system for conveying steel billets to rolling mill by heating furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108356076A (en) * | 2018-01-18 | 2018-08-03 | 河钢股份有限公司承德分公司 | A kind of continuous casting billet milling method |
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| CN112845630A (en) * | 2020-12-31 | 2021-05-28 | 南京净环热冶金工程有限公司 | Online heat preservation and heat supplement method for continuous casting billet |
| CN113564360A (en) * | 2021-08-18 | 2021-10-29 | 宁夏森源重工设备有限公司 | Hot charging and hot conveying equipment for large-scale silicomanganese ore heating furnace and manufacturing process thereof |
| CN114850228A (en) * | 2022-04-26 | 2022-08-05 | 广东韶钢松山股份有限公司 | Control method and system for conveying steel billets to rolling mill by heating furnace |
| CN114850228B (en) * | 2022-04-26 | 2023-12-01 | 广东韶钢松山股份有限公司 | Control method and system for conveying steel billets to rolling mill by heating furnace |
| CN114713631A (en) * | 2022-05-18 | 2022-07-08 | 首钢长治钢铁有限公司 | Rolling production system integration |
| CN114713631B (en) * | 2022-05-18 | 2024-01-12 | 首钢长治钢铁有限公司 | Rolling production system integration |
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Application publication date: 20171222 |