CN107321949A - Thin-slab caster becomes slag line method - Google Patents
Thin-slab caster becomes slag line method Download PDFInfo
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- CN107321949A CN107321949A CN201710494826.1A CN201710494826A CN107321949A CN 107321949 A CN107321949 A CN 107321949A CN 201710494826 A CN201710494826 A CN 201710494826A CN 107321949 A CN107321949 A CN 107321949A
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- crystallizer
- liquid level
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- tundish car
- slag line
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- 239000002893 slag Substances 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 69
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 18
- 239000010959 steel Substances 0.000 claims abstract description 18
- 238000007654 immersion Methods 0.000 claims abstract description 4
- 238000005266 casting Methods 0.000 claims description 41
- 238000009749 continuous casting Methods 0.000 claims description 33
- 239000004973 liquid crystal related substance Substances 0.000 claims description 25
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 230000006698 induction Effects 0.000 claims description 5
- 238000003780 insertion Methods 0.000 abstract description 8
- 230000037431 insertion Effects 0.000 abstract description 8
- 238000009491 slugging Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 17
- 238000005096 rolling process Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 230000002035 prolonged effect Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention provides a kind of thin-slab caster and becomes slag line method, including：According to the range of tundish car and mould liquid level scope, the insertion molten steel depth of submersed nozzle is adjusted, the slag line auto-alter of thin-slab caster is realized.Using the present invention, can solve the problem that because become slag line parameter setting it is unreasonable caused by level fluctuation, slugging is bad the problems such as, lifted the whole immersion type mouth of a river life-span.
Description
Technical Field
The invention relates to the technical field of thin slab continuous casting, in particular to a high-casting-speed thin slab continuous casting machine slag line changing method.
Background
The continuous casting and rolling of thin slabs is a brand-new short-flow process for producing hot rolled plate coils successfully developed in the end of the 80 th 20 th century, wherein a continuous casting and rolling technology is one of the most important revolutionary technologies in the steel industry, the continuous casting design drawing speed of the continuous casting and rolling technology is 6.5m/min, and the steel passing amount in unit time is more than or equal to 5.5 t. The submerged nozzle of the sheet billet continuous casting machine has the functions of shunting, stabilizing the flow field in the crystallizer and the like, and the sheet billet continuous casting adopts the integral nozzle in the actual production process, so that the sheet billet continuous casting machine cannot be replaced on line. Among them, there are several problems at present:
1. the service life of the whole submerged nozzle directly determines the number of continuous casting furnaces of the whole production line, and the insufficient service life directly results in limited productivity and high cost of refractory materials of the tundish.
2. The traditional slag line changing mode has the defects of low precision, unreasonable slag line parameter setting and the like, and influences the flow field of a crystallizer at high casting speed (more than or equal to 5.5m/min), so that the liquid level fluctuation is increased, and further the casting blank quality and the production stability are influenced.
Therefore, in order to solve the problems, the invention provides a high-pulling-speed thin slab continuous casting slag-changing line method by combining the technical characteristics of the production process of an ESP production line.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a method for changing a slag line of a thin slab caster, which solves the problems of liquid level fluctuation, poor slag melting and the like caused by unreasonable parameter setting of the slag line, and prolongs the service life of the whole submerged nozzle.
The invention provides a method for changing a slag line of a thin slab continuous casting machine, which comprises the following steps: according to the lifting range of the tundish car and the liquid level range of the crystallizer, the depth of the submerged nozzle inserted into molten steel is adjusted, and an automatic slag changing line of a sheet billet continuous casting machine is realized; wherein,
when the depth of molten steel inserted into the submerged nozzle is adjusted according to the lifting range of the tundish car, a hydraulic cylinder for driving the tundish car to lift is arranged on the tundish car, a displacement sensor is arranged in the hydraulic cylinder, and the position of the tundish car is detected in real time through the displacement sensor, wherein the initial position of the tundish car during casting is set at a position 300mm away from the upper opening end of the liquid crystal device, and the position moving range of the tundish car is set within the range 267-333mm away from the upper opening end of the liquid crystal device;
when the depth of molten steel inserted into the submerged nozzle is adjusted according to the liquid level range of the crystallizer, the liquid level of the crystallizer is controlled in a vortex induction mode, and the liquid level of the crystallizer is lifted and lowered by changing the set value of the liquid level of the crystallizer, wherein the initial casting starting position of the crystallizer is set at a position 103mm away from the upper opening end of the liquid crystal device, and the casting starting liquid level of the crystallizer is set within a range of 94-112mm away from the upper opening end of the liquid crystal device.
In addition, the preferable scheme is that the control accuracy of the tundish car is 1 mm; the control precision of the crystallizer liquid level is 0.1 mm.
In addition, preferably, the slag line range of the submerged nozzle is determined according to the range set by the position movement of the tundish car and the range set by the casting liquid level of the crystallizer.
In addition, the slag line of the submerged nozzle is preferably in the range of 48-84 mm.
According to the technical scheme, the variable slag line parameter is set through the lifting position of the hydraulic cylinder of the tundish car and the liquid level variation range of the crystallizer, so that the problems of liquid level fluctuation, poor slag melting and the like caused by unreasonable setting of the variable slag line parameter are solved, and the service life of the whole submerged nozzle is prolonged.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Further, the present invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and results of the present invention will become more apparent and more readily appreciated as the same becomes better understood by reference to the following description taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a schematic flow chart of a thin slab caster variable slag line method according to an embodiment of the invention;
FIG. 2 is a graph of the position of the tundish car according to the embodiment of the present invention;
fig. 3 is a graph showing the position of the tundish car according to the embodiment of the present invention.
The same reference numbers in all figures indicate similar or corresponding features or functions.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details.
At present, because of the problems of unreasonable parameter setting of a variable slag line of a high-casting-speed thin slab continuous casting machine and the like, the liquid level fluctuation is obviously larger than +/-3 mm, the casting speed of the thin slab continuous casting machine can only reach 4m/min, and the requirement of a high-casting-speed continuous casting and rolling production line of more than 5.0m/min cannot be met. In order to solve the problems of the slag changing line of the existing continuous casting machine, the invention provides a method for changing the slag line of a thin slab, which is characterized in that the parameters of the slag changing line are set according to the lifting position of a hydraulic cylinder of a tundish car and the liquid level variation range of a crystallizer, so that the problems of liquid level fluctuation, poor slag melting and the like caused by unreasonable setting of the parameters of the slag changing line are solved, and the service life of the whole submerged nozzle is prolonged.
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In order to illustrate the process flow of the slag line changing method of the thin slab caster, fig. 1 shows the process flow of the slag line changing method of the thin slab caster according to an embodiment of the invention.
As shown in fig. 1, the method for changing the slag line of the thin slab caster provided by the invention adjusts the depth of molten steel inserted into an immersion nozzle according to the lifting range of a hydraulic cylinder on a tundish car and the variation range of the liquid level of a crystallizer, so as to realize the automatic slag line change of the thin slab caster, and comprises the following specific steps:
s110: starting;
s120: when the depth of molten steel inserted into the submerged nozzle is adjusted according to the lifting range of the tundish car, a hydraulic cylinder for driving the tundish car to lift is arranged on the tundish car, a displacement sensor is arranged in the hydraulic cylinder, and the displacement sensor detects the position of the tundish car in real time, wherein the initial position of the tundish car during casting is set at a position 300mm away from the upper opening end of the liquid crystal device, and the position moving range of the tundish car is set within a range 267-333mm away from the upper opening end of the liquid crystal device.
S130: when the depth of molten steel inserted into the submerged nozzle is adjusted according to the liquid level range of the crystallizer, the liquid level of the crystallizer is controlled in a vortex induction mode, and the liquid level of the crystallizer is lifted and lowered by changing the set value of the liquid level of the crystallizer, wherein the initial casting starting position of the crystallizer is set to be 103mm away from the upper opening end of the liquid crystal device, and the casting starting liquid level of the crystallizer is set to be within the range of 94-112mm away from the upper opening end of the liquid crystal device.
Specifically, in step S120, the lifting of the tundish car is controlled by the hydraulic cylinder, and the specific position of the tundish car is detected in real time by the displacement sensor, wherein the initial position of the tundish car and the position of the tundish car are both set with reference to the upper opening end of the liquid crystal device, in the actual production, when the position of the tundish car is measured by the displacement sensor, the calibration base point of the displacement sensor is the same as the calibration base point for controlling the liquid level of the liquid crystal device by adopting the eddy current induction mode, namely, the 0 point position is the same position, the initial position of the tundish car is set at 100mm during pouring (the initial position of the tundish car is set at the position 300mm away from the upper opening end of the liquid crystal device during pouring), the position moving range of the tundish car is set within +/-33 mm of the initial position of the tundish car, or is between 67 mm and 133mm (the position moving range of the tundish car is set within 267-333mm away from the upper opening end of the liquid crystal device) .
The tundish car can move up and down between 0mm and 600mm, and the tundish car can be conveniently cleaned or maintained by moving the tundish car in the range; the range of the position movement of the tundish car is set to be 67-133mm, and is in the range of 0-600 mm.
In step S130, the liquid level of the liquid crystal container is measured by an eddy current sensing method, in the embodiment of the present invention, the eddy current sensing method can measure a range of 400mm, the upper opening end of the liquid crystal container is set to 400mm, a position which is a distance of 400mm from the upper opening end of the liquid crystal container downwards is set to 0mm of the liquid crystal container, with 0 as a base point, the initial casting position of the mold is set to 297mm (the initial casting position of the mold is set to a position which is 103mm from the upper opening end of the liquid crystal container), and the initial casting liquid level of the mold is set to 288 plus 306mm, that is: the casting liquid level of the crystallizer is set within the range of +/-9 mm of the casting initial position of the crystallizer (the casting liquid level of the crystallizer is set within the range of 94-112mm away from the upper opening end of the crystallizer).
Wherein, it should be noted that the liquid level lifting range of the liquid crystal device is 260-; therefore, the set range of the casting liquid level of the crystallizer is within the lifting range of the liquid level of the liquid crystal device, so that the operation safety is ensured. Wherein the control accuracy of the tundish car under the action of the displacement sensor is 1 mm; the control precision of the crystallizer liquid level is 0.1mm under the action of a vortex induction mode.
In the embodiment of the invention, the insertion depth of the submerged nozzle of the tundish is adjusted by the combined action of the lifting of the tundish car and the lifting of the liquid level of the crystallizer, and the liquid level height of the crystallizer and the position of the tundish car are continuously changed from the opening time point 0 of the slag line, namely the insertion depth of the submerged nozzle is continuously changed. The overall service life of the submerged nozzle is prolonged by continuously changing the erosion position of the submerged nozzle.
According to the fact that the movement set range of the tundish car is within +/-33 mm of the initial position of the tundish car and the set range of the casting liquid level of the crystallizer is within 9mm of the casting initial position of the crystallizer, the slag line range of the submerged nozzle is determined to be 48-84mm, namely: the thickness of the glass is 66mm +18 mm-84 mm, and the thickness of the glass is 66mm-18 mm-48 mm.
Wherein, it should be said that, when the sheet bar conticaster is going on becoming the slag line, the package car descends gradually in the middle of, and liquid increases gradually in the crystallizer, and the crystallizer liquid level rises, when the package car descends to the minimum point in the middle of, promptly: when the tundish car moves to-33 mm away from the initial position of the tundish car, the liquid level in the liquid crystal device is the highest point, namely: when the casting liquid level of the crystallizer moves to the casting initial position +9 of the crystallizer, the slag line of the submerged nozzle is 66mm-18 mm-48 mm, and the process is that the tundish car and the liquid level of the crystallizer move oppositely.
When the tundish car gradually rises, the liquid gradually decreases in the crystallizer, the liquid level of the crystallizer falls, and when the tundish car falls to the highest point, the method is as follows: when the tundish car moves to +33mm away from the initial position of the tundish car, at the moment, the liquid level in the liquid crystal device is the lowest point, namely: when the casting liquid level of the crystallizer moves to the casting initial position-9 of the crystallizer, the slag line of the submerged nozzle is 66mm +18 mm-84 mm, and the process is that the tundish car and the liquid level of the crystallizer move away from each other.
In the embodiment of the invention, a tracking value of 25-35 m after continuous casting of a thin slab continuous casting machine is normally opened is started to realize a slag line changing function until the casting time is finished, the position of a tundish car and the liquid level of a crystallizer are continuously changed, a slag line is in constant motion in the casting process, and specific implementation parameters are shown in fig. 2 and fig. 3, wherein fig. 2 shows a lifting curve of the position of the tundish car according to the embodiment of the invention; fig. 3 shows a tundish car position lifting curve according to an embodiment of the present invention.
Specifically, as shown in fig. 2, fig. 2 is a tundish car position change curve, taking the opening time of a slag line as 0 point, the tundish car position which is 80% of the first furnace pouring time is lowered to the lowest point of 33mm, and the tundish car position lifting rate is 0.69 mm/min; the highest point of the ladle car position is lifted by 33mm in the rest 20% of the first furnace and 20% of the pouring time of the second furnace, and the descending speed of the tundish car is 1.375 mm/min; the tundish position is reduced to-33 mm in the remaining time of the casting, and the remaining time t of each casting is (the number of the furnace of the production plan is-1.2) multiplied by the casting time of a single furnace for 60min according to the production plan.
As shown in fig. 3, the crystallizer casting liquid level is set to 297mm, fig. 3 is a crystallizer liquid level change curve, the opening time of a slag line is 0 point, 80% of the liquid level of the first furnace casting time is increased to the highest point 306mm, and the rising rate of the liquid level of the crystallizer is 0.1875 mm/min; the liquid level of the residual 20 percent of the first furnace and the 20 percent of the pouring time of the second furnace is reduced to the lowest point of 288mm, and the liquid level reduction rate of the crystallizer is 0.75 mm/min; the liquid level of the crystallizer is increased to 306mm in the residual time of the casting, and the residual time t of each casting is equal to (the number of furnaces in the production plan is-1.2) multiplied by the casting time of a single furnace for 60min according to the production plan.
Combining the embodiments shown in fig. 2 and fig. 3, from the initial point of continuous casting, namely the crystallizer liquid level 297mm and the tundish car position 100mm, the immersion nozzle insertion depth is 200mm, the insertion depth is increased from 0 point, and the maximum insertion depth is 242mm when the molten steel is poured to the point A; the insertion depth starts to decrease after reaching the maximum value, and the minimum value is 158mm when reaching the point B; the insertion depth increases again from point B to point C again reaching 242 mm.
It should be noted that, in order to ensure a constant height difference between the molten steel in the tundish car and the liquid level of the crystallizer and stabilize the molten steel static pressure in the crystallizer, the molten steel level in the tundish car is synchronously lifted in a control mode the same as the liquid level of the crystallizer so as to stabilize the liquid level of the crystallizer.
In the embodiment of the invention, the main controller sets the number of continuous casting furnaces in an automatic slag line changing program of the continuous casting machine according to a production plan in time before the thin slab continuous casting machine starts casting, the system automatically calculates the casting time of a single furnace, the total casting time, the liquid level of a crystallizer or the time of the position of a tundish car and the descending time according to the number of the continuous casting furnaces, and the automatic slag line of an invasive water gap is realized after the slag line is opened.
The generation plan completed by the variable slag line method of the thin slab caster of the present invention has the following embodiments.
The first embodiment is as follows: the ESP continuous casting and rolling production has 1500 multiplied by 100mm cross section, when the drawing speed is 5.5m/min, the fluctuation of the crystallizer liquid level is controlled within plus or minus 1.0mm, the standard deviation is less than or equal to 0.8mm, and the continuous casting heat number meets the 12 furnace production requirement.
Example two:
the ESP continuous casting and rolling production has 1250 multiplied by 90mm cross section, when the drawing speed is 6.2m/min, the fluctuation of the crystallizer liquid level is controlled within plus or minus 1.2mm, the standard deviation is less than or equal to 1.0mm, and the continuous casting heat number meets the 10 furnace requirement.
According to the invention, by adopting the sheet billet slag line changing method, the corrosion of molten steel and casting powder to the whole submerged nozzle can be reduced, the pouring life of single pouring is effectively prolonged, and the continuous pouring time is increased from 6 furnaces to 8 furnaces on average.
Wherein, the ESP continuous casting and rolling production section of 1250 multiplied by 100mm is calculated, and the production benefit is calculated. The average continuous casting furnace number is increased from 6 furnaces to 8 furnaces, the cost per ton of steel is reduced by 3/ton, and the annual economic benefit is as follows: 220 × 3 ═ 660 ten thousand yuan; the annual average benefit of 3 lines is: 660 × 3 ═ 1980 ten thousand yuan.
According to the thin slab continuous casting machine slag line changing method, the slag line changing parameters are set through the lifting position of the hydraulic cylinder of the tundish car and the liquid level change range of the crystallizer, the problems of liquid level fluctuation, poor slag melting and the like caused by unreasonable setting of the slag line changing parameters are solved, and the service life of the whole submerged nozzle is prolonged.
The slag line changing method of the thin slab caster proposed according to the present invention is described above by way of example with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that various modifications could be made to the thin slab caster slagging line method set forth above without departing from the scope of the invention. Therefore, the scope of the present invention should be determined by the contents of the appended claims.
Claims (4)
1. A thin slab caster variable slag line method comprises the following steps: according to the lifting range of the tundish car and the liquid level range of the crystallizer, the depth of the submerged nozzle inserted into molten steel is adjusted, and an automatic slag changing line of a sheet billet continuous casting machine is realized; wherein,
when the depth of molten steel inserted into an immersion nozzle is adjusted according to the lifting range of the tundish car, a hydraulic cylinder for driving the tundish car to lift is arranged on the tundish car, a displacement sensor is arranged in the hydraulic cylinder, and the position of the tundish car is detected in real time through the displacement sensor, wherein the initial position of the tundish car during casting is set at a position 300mm away from the upper opening end of the liquid crystal device, and the movement range of the position of the tundish car is set within a range 267-333mm away from the upper opening end of the liquid crystal device;
when the depth of molten steel inserted into the submerged nozzle is adjusted according to the liquid level range of the crystallizer, the liquid level of the crystallizer is controlled in a vortex induction mode, and the liquid level of the crystallizer is lifted and lowered by changing the set value of the liquid level of the crystallizer, wherein the initial casting starting position of the crystallizer is set at a position 103mm away from the upper opening end of the liquid crystal device, and the casting starting liquid level of the crystallizer is set within a range 94-112mm away from the upper opening end of the liquid crystal device.
2. The thin slab caster slag line method of claim 1,
the control accuracy of the tundish car is 1 mm;
the control precision of the crystallizer liquid level is 0.1 mm.
3. The thin slab caster slag line method of claim 1,
and determining the slag line range of the submerged nozzle according to the range set by the position movement of the tundish car and the range set by the casting liquid level of the crystallizer.
4. The thin slab caster slag line method of claim 3,
the slag line range of the submerged nozzle is 48-84 mm.
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| CN201710494826.1A CN107321949B (en) | 2017-06-26 | 2017-06-26 | Slag line changing method for thin slab continuous casting machine |
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| CN201710494826.1A CN107321949B (en) | 2017-06-26 | 2017-06-26 | Slag line changing method for thin slab continuous casting machine |
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| CN107321949B CN107321949B (en) | 2020-01-03 |
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| CN110202107A (en) * | 2019-06-21 | 2019-09-06 | 邯郸钢铁集团有限责任公司 | Tundish immersed nozzle immersion depth Automatic adjustment method |
| CN110449569A (en) * | 2019-09-11 | 2019-11-15 | 攀钢集团西昌钢钒有限公司 | A kind of submersed nozzle slag line method of adjustment |
| CN110788294A (en) * | 2019-10-30 | 2020-02-14 | 广东韶钢松山股份有限公司 | Method and system for adjusting slag line of submerged nozzle of continuous casting machine |
| CN111036871A (en) * | 2019-12-13 | 2020-04-21 | 张家港宏昌钢板有限公司 | Method for controlling insertion depth of small square billet submerged nozzle |
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| CN115502356A (en) * | 2022-11-03 | 2022-12-23 | 浦项(张家港)不锈钢股份有限公司 | Slag line changing method for submerged nozzle in middle casting period and application |
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| CN110202107B (en) * | 2019-06-21 | 2024-02-09 | 邯郸钢铁集团有限责任公司 | Automatic regulating method for immersion depth of immersion nozzle of tundish |
| CN110449569A (en) * | 2019-09-11 | 2019-11-15 | 攀钢集团西昌钢钒有限公司 | A kind of submersed nozzle slag line method of adjustment |
| CN110449569B (en) * | 2019-09-11 | 2021-12-03 | 攀钢集团西昌钢钒有限公司 | Submerged nozzle slag line adjusting method |
| CN110788294A (en) * | 2019-10-30 | 2020-02-14 | 广东韶钢松山股份有限公司 | Method and system for adjusting slag line of submerged nozzle of continuous casting machine |
| CN111036871A (en) * | 2019-12-13 | 2020-04-21 | 张家港宏昌钢板有限公司 | Method for controlling insertion depth of small square billet submerged nozzle |
| CN111036871B (en) * | 2019-12-13 | 2021-10-08 | 张家港宏昌钢板有限公司 | Method for controlling insertion depth of small square billet submerged nozzle |
| CN113649538A (en) * | 2021-08-19 | 2021-11-16 | 宝武集团鄂城钢铁有限公司 | Automatic slag line changing system of slab caster based on molten steel temperature control |
| CN115502356A (en) * | 2022-11-03 | 2022-12-23 | 浦项(张家港)不锈钢股份有限公司 | Slag line changing method for submerged nozzle in middle casting period and application |
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Denomination of invention: Method for changing slag line of thin slab caster Effective date of registration: 20211222 Granted publication date: 20200103 Pledgee: Rizhao Bank Co., Ltd Pledgor: RIZHAO BAOHUA NEW MATERIAL CO.,LTD. Registration number: Y2021980015871 |
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