CN211938996U - Stainless steel/carbon steel composite board gating system and production system - Google Patents
Stainless steel/carbon steel composite board gating system and production system Download PDFInfo
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- CN211938996U CN211938996U CN202020093743.9U CN202020093743U CN211938996U CN 211938996 U CN211938996 U CN 211938996U CN 202020093743 U CN202020093743 U CN 202020093743U CN 211938996 U CN211938996 U CN 211938996U
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Abstract
The utility model discloses a stainless steel/carbon steel composite board pouring system and a production system, which comprises a pouring system, a mould assembly, a mould transportation platform, a heating system, an atmosphere protection system and a heat treatment mechanism; the system is reliable, the production process is smooth, the automation degree is high, a large amount of manual operation is not needed, and the product stability and the production efficiency are improved; the stainless steel/carbon steel composite plate is produced by adopting a solid-liquid compounding mode, the requirement of the production process on the vacuum degree is reduced, metallurgical bonding is realized between stainless steel/carbon steel interfaces through fusion, and the strength is enough to meet the requirement of subsequent hot rolling production; by designing the inner and outer double-layer molds, the complex preposed process flow when sand casting or lost foam casting is adopted for solid-liquid compounding is simplified, and the production requirements of various specifications and various components can be met; meanwhile, the clamping die can be repeatedly used, so that the stainless steel die bulging deformation is prevented and the surface quality of a cladding layer is improved while the die transportation process is facilitated.
Description
Technical Field
The utility model relates to a bimetal composite's preparation field, concretely relates to stainless steel carbon steel composite sheet gating system and production system.
Background
With the rapid development of industry and science and technology, the comprehensive performance requirements of materials are continuously improved. In particular, in the fields of energy transmission, ocean engineering, petrochemical engineering and the like, in addition to considering the mechanical property of the material, the high-wear or high-corrosion environment also needs to adopt a corresponding wear-resistant or corrosion-resistant material to prevent the environment from being damaged. The stainless steel composite plate is formed by combining a layer of layered composite material with high corrosion resistance stainless steel on a carbon steel or low alloy steel plate by a certain process, so that the stainless steel composite plate is suitable for a high corrosion environment, greatly saves the using amount of expensive stainless steel and can obviously reduce the production cost.
At present, most stainless steel composite boards are produced by adopting a solid-solid composite connection mode, wherein an explosion cladding method has serious environmental pollution and low automation degree, and continuous production cannot be realized; the rolling composite method has relatively high production efficiency, but the bonding interface is very susceptible to oxidation, and the bonding strength of the interface is reduced.
Compared with a solid-solid composite connection mode, the solid-liquid composite connection mode has the advantages that the requirements of the solid-liquid composite connection mode on oxide skins of the bonding layers are not very strict, the metallurgical connection is realized through interface fusion, and the strength is enough to meet the requirements of subsequent hot rolling. Meanwhile, the casting blank produced by the solid-liquid composite method reduces the workload of preprocessing the joint surface before hot rolling, and can obviously improve the production efficiency.
In summary, at present, no system for efficiently producing large-size double-layer stainless steel/carbon steel composite plates by a solid-liquid composite method exists. In order to solve the problems of temperature control, surface quality and production efficiency in the solid-liquid composite pouring process of the composite plate, the development of a novel stainless steel/carbon steel solid-liquid composite pouring device is particularly critical.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a stainless steel carbon steel composite sheet gating system and production system to solve the problem of current stainless steel carbon steel composite sheet preparation inefficiency, quality difference.
The utility model provides an above-mentioned technical problem's technical scheme as follows: a stainless steel/carbon steel composite board pouring system comprises a heating furnace, a travelling crane channel, a pouring ladle, a molten steel treatment station for heating molten steel in the pouring ladle, a tundish and a liquid level detection device; the travelling crane channel is arranged above the heating furnace and used for transporting a casting ladle, the casting ladle is movably arranged on the travelling crane channel, and the tundish is arranged below the casting ladle;
the device comprises a pouring ladle, a heating furnace, a pouring ladle, a liquid level detection device, a stopper rod flow control device, a flow guide carbon steel pipe, a liquid level detection device and a control device, wherein the pouring ladle is provided with a sliding water gap corresponding to the pouring ladle at the bottom, the long water gap communicated with the pouring ladle and the heating furnace is arranged at the bottom, the long water gap is positioned at one side of the pouring ladle and is provided with the stopper rod flow control device, the long water gap is positioned at the other side of the heating furnace and is provided with the flow guide carbon steel pipe, the liquid level.
Further, in the preferred embodiment of the present invention, a heating system and an atmosphere protection system are disposed in the heating furnace.
The utility model also provides a production system of the stainless steel/carbon steel composite board, which comprises the pouring system, the mould assembly, the mould transportation platform and the heat treatment mechanism;
the mould transport platform comprises a guide rail and a mould delivery wagon matched and connected with the guide rail, the mould assembly is located in the mould delivery wagon, the guide rail transversely penetrates through the heating furnace and extends into the heat treatment mechanism, the mould delivery wagon corresponds to the pouring system, and the mould assembly corresponds to the diversion carbon steel pipe.
Further, in the preferred embodiment of the present invention, the mold assembly comprises a stainless steel mold and a clamping mold connected to the periphery of the stainless steel mold.
Further, in the preferred embodiment of the present invention, the stainless steel mold comprises two stainless steel plates disposed oppositely, a side plate disposed between the two stainless steel plate ends, and a bottom plate disposed between the two stainless steel plate bottoms, and a mold cavity is formed between the two stainless steel plates, the side plate, and the bottom plate.
Further, in the preferred embodiment of the present invention, the clamping mold comprises a clamping side plate, a clamping bottom plate, and a clamping side plate, wherein the clamping side plate is arranged on the outer wall surface of the stainless steel plate, the clamping side plate is arranged on the outer wall surface of the side plate, the clamping bottom plate is arranged on the outer wall surface of the bottom plate, and the clamping side plate is connected with the clamping side plate through a bolt.
Further, in the preferred embodiment of the present invention, the clamping side plate and the clamping bottom plate are formed with a clamping cavity for the stainless steel mold to be put in, and the size of the clamping cavity is adapted to the size of the stainless steel mold.
Further, in the preferred embodiment of the present invention, a lifting device is disposed on the clamping side plate.
Further, in the preferred embodiment of the present invention, an insulating riser is installed above the stainless steel mold.
Further, in a preferred embodiment of the present invention, the heat treatment mechanism employs a heat treatment tank.
The utility model discloses following beneficial effect has: the pouring system and the production system for the stainless steel/carbon steel composite plate provided by the utility model have the advantages of reliability, smooth production process, high automation degree, no need of a large amount of manual operation, and improved product stability and production efficiency; the stainless steel/carbon steel composite plate is produced by adopting a solid-liquid compounding mode, the requirement of the production process on the vacuum degree is reduced, metallurgical bonding is realized between stainless steel/carbon steel interfaces through fusion, and the strength is enough to meet the requirement of subsequent hot rolling production; by designing the inner and outer double-layer molds, the complex preposed process flow when sand casting or lost foam casting is adopted for solid-liquid compounding is simplified, and the production requirements of various specifications and various components can be met; meanwhile, the clamping die can be repeatedly used, so that the stainless steel die bulging deformation is prevented and the surface quality of a cladding layer is improved while the die transportation process is facilitated.
Drawings
FIG. 1 is a schematic view of the production process of the present invention;
FIG. 2 is a schematic view of the stainless steel mold of the present invention;
FIG. 3 is a schematic view of the clamping mold of the present invention;
FIG. 4 is a plan view of the heating furnace area of the present invention;
FIG. 5 is a schematic view of the mold assembly after the casting and composite molding of the present invention;
the reference numerals shown in fig. 1 to 5 are respectively expressed as: 1-heating furnace, 2-travelling crane channel, 3-casting ladle, 4-molten steel treatment station, 5-tundish, 6-sliding nozzle, 7-long nozzle, 8-stopper rod flow control device, 9-diversion carbon steel pipe, 10-mould assembly, 11-mould transportation platform, 110-guide rail, 111-mould delivery wagon, 101-stainless steel plate, 102-side plate, 103-bottom plate, 104-mould cavity, 106-clamping side plate, 107-clamping side plate, 108-clamping bottom plate and 109-lifting appliance.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, the pouring system of the stainless steel/carbon steel composite plate of the present invention comprises: the device comprises a heating furnace 1, a travelling crane channel 2, a molten steel treatment station 4, a casting ladle 3, a tundish 5 and a liquid level detection device.
The travelling crane channel 2 is positioned above the whole pouring system and is used for transporting the ladle 3, and the ladle 3 is transported to the position above the tundish 5 so as to inject carbon steel liquid into the tundish 5. Specifically, the traveling lane 2 is disposed above the heating furnace 1. The molten steel treatment station 4 is connected with the casting ladle 3 to treat the molten carbon steel in the casting ladle 3, and the molten carbon steel in the casting ladle 3 is subjected to temperature and component control through the molten steel treatment station 4 so as to meet the casting requirement.
The ladle 3 is movably arranged on the travelling crane channel 2. The ladle 3 is suspended on the travelling crane channel 2, moves along the travelling crane channel 2, and is transferred to the upper part of the tundish 5 so as to inject carbon steel liquid. The utility model discloses a driving passageway 2 is to watering packet 3 and is transferred fortune control, has improved convenient operation swiftly, can also carry out the injection of carbon steel liquid to pouring basket 5 on the different heating furnaces 1 through removing pouring basket 5 moreover to realize extensive continuous production, improve production efficiency greatly. The bottom of the casting ladle 3 is provided with a sliding water gap 6 corresponding to the tundish 5, and carbon steel liquid is injected into the tundish 5 through the sliding water gap 6.
The tundish 5 is disposed below the ladle 3. The tundish 5 is also provided on the top of the heating furnace 1 for easy fixed installation and easy communication with the heating furnace 1. The bottom of the tundish 5 is provided with a long nozzle 7 for communicating the tundish 5 and the heating furnace 1. One side of the long nozzle 7, which is positioned at the tundish 5, is provided with a stopper rod flow control device 8 for controlling the inflow speed of carbon steel liquid, so that the influence on interface combination caused by the scouring of the inner surface of a stainless steel mould due to too high speed is avoided, and the reduction of the production efficiency due to too low speed is also avoided. And a diversion carbon steel pipe 9 is arranged on the other side of the long nozzle 7 positioned on the heating furnace 1. The diversion carbon steel pipe 9 is used for guiding the pouring liquid to the middle of the cavity of the stainless steel mold, so that the inner wall of the stainless steel mold is prevented from being washed away by the pouring liquid, and the diversion carbon steel pipe 9 is made of carbon steel and the same as the pouring liquid, so that new impurities cannot be introduced due to different materials while the diversion effect is achieved. The liquid level detection device is arranged in a stainless steel mould for preparing the stainless steel/carbon steel composite board and used for monitoring the liquid level change of the pouring liquid in real time, so that the stopper rod flow control device 8 controls the flow velocity of the pouring liquid according to the detected liquid level change, and the inner wall of the stainless steel mould is prevented from being washed by the pouring liquid. The stainless steel mold is located inside the furnace 1 during the casting process. A heating system and an atmosphere protection system are arranged in the heating furnace 1.
Specifically, the "sliding gate nozzle" of the present invention is a method of controlling a communication state between a ladle and a tundish by providing a slide plate at a gate (which means an outlet through which molten steel flows out, and may be understood as a through-hole structure). The utility model relates to a "long mouth of a river" means that the mode that sets up the long tube at the mouth of a river communicates middle package and heating furnace. The utility model discloses a stopper stick accuse stream device's theory of operation be, through set up bar-shaped stopper in long mouth of a river, make the stopper reciprocate along the long tube in long mouth of a river, adjust long mouth of a river size to control the flow size of molten steel heating furnace. When the plug is completely pulled out, the water flow is maximum, the flow rate of molten steel is generally controlled by partially blocking the nozzle through the plug, and the flow rate is generally adjusted by vertically moving a plug rod made of a hydraulic control refractory material. The concrete structure of stopper stick accuse stream device can refer to the structure among the prior art and realize, the utility model discloses do not do this also do not inject.
Lead to the faying face performance to reduce for avoiding carbon steel liquid to the washing away of stainless steel mould inner wall to influence the performance of whole composite sheet, the utility model discloses a liquid level detection device (also can be called liquid level detection system or liquid level fluctuation detecting system) monitors the liquid level, adjusts stopper stick accuse flow device's velocity of flow size through the violent degree of liquid level fluctuation change. When the liquid level fluctuates severely, the detected signal is transmitted to the controller through a numerical simulation technology, and then the controller adjusts the flow rate of the stopper rod flow control device according to the detected signal, so that the carbon steel liquid is prevented from scouring the inner wall of the stainless steel die. The controller is an external control device and can select an upper computer or a PLC. The intensity of the liquid level refers to the change height of the liquid level in unit time, and is judged according to whether the change height exceeds a preset threshold value, if so, the liquid level is determined to be intense, the flow rate needs to be reduced, otherwise, the flow rate can be unchanged or properly increased.
The utility model also provides a production system of stainless steel carbon steel composite sheet, including gating system, mould subassembly 10, mould transportation platform 11 and thermal treatment mechanism.
The mold transportation platform 11 comprises a guide rail 110 and a plurality of mold transportation vehicles 111 connected to the guide rail 110 in a matching manner, the mold assemblies 10 are positioned in the mold transportation vehicles 111, the mold assemblies 10 are arranged on the mold transportation vehicles, and heat-insulating risers are arranged above the stainless steel molds; utilize mould transport platform 11 to transport mould subassembly 10 to before heating furnace 1 to put into heating furnace 1 appointed position through centre gripping mould both sides hoist 109, formulate the heating system according to mould subassembly 10 size and preheating temperature, preheat mould subassembly 10, pass through the mould transport vechicle after preheating with mould subassembly 10 through heating furnace 1 side furnace gate entering heating furnace 1 and berth at appointed casting position, and then pour the operation through the pouring system. When pouring is carried out, after the temperature and the components of carbon steel liquid to be poured are regulated and controlled by a molten steel treatment station 4, a ladle is lifted to the upper part of a heating furnace 1 through a top travelling crane channel 2, and the casting is carried out through a casting system of the heating furnace 1; the casting system comprises a tundish 5, a flow control device and a liquid level detection system, wherein after carbon molten steel to be cast is shunted by the tundish 5, multi-die continuous casting and simultaneous casting can be realized, the liquid level of carbon steel in a stainless steel die is detected by the liquid level detection system during casting, and the flow control device is adjusted on line to ensure that the liquid level is stable so as to reduce the scouring on the inner wall of the stainless steel plate 101; after casting, the mold assembly 10 is placed into the mold transportation platform 11 by the furnace front loading and conveying system, the outer surface of the clamping mold is controlled to be cooled in the transportation process, after the mold assembly reaches a heat treatment area, the mold assembly is hung into a heat treatment tank to be cooled, the clamping mold is demoulded, and the stainless steel mold and the carbon steel solidified inside the stainless steel mold are the produced double-layer stainless steel/carbon steel composite plate. And after cooling, performing surface treatment on the double-layer stainless steel/carbon steel composite plate, preparing to convey to the heating furnace 1 or directly rolling, and clamping the mold to remove the oxide skin on the inner wall, and then putting the double-layer stainless steel/carbon steel composite plate into use again. The heating system and the atmosphere protection system are arranged in the heating furnace 1, the heating system is used for controlling the temperature in the heating furnace 1 to be kept at 1500 ℃ plus 100 ℃, and the atmosphere protection system is used for ensuring that the inert/reducing atmosphere is always kept in the production process. The plan view of the heating furnace 1 area of the solid-liquid composite board production line in this embodiment is shown in fig. 2, and two heating furnaces 1 can preheat and pour 5 groups of molds at the same time.
The stainless steel/carbon steel composite board of the utility model can use stainless steel as a composite layer and carbon steel as a base layer, and can also use carbon steel as a composite layer and stainless steel as a base layer. By using the technical concept of the present invention as a guide, those skilled in the art can derive the manufacturing process of other metal composite plates, and the present invention is also within the protection scope, for example, the titanium-carbon steel composite plate can be used for ocean platforms.
The guide rail 110 transversely penetrates through the heating furnace 1 and extends into the heat treatment mechanism, so that the mold transport platform 11 can automatically move back and forth between the heating furnace 1 and the heat treatment tank through a ground track. The mold assembly 10 is cooled during transport in a controlled manner including, but not limited to: air cooling, water spray cooling, internal water injection cooling, water quenching, oil quenching and the like; the heat treatment mode comprises one or more of annealing, normalizing, tempering and quenching.
The mold assembly 10 includes a stainless steel mold and a clamping mold attached to the periphery of the stainless steel mold. As shown in fig. 3, the stainless steel mold includes two stainless steel plates 101 disposed opposite to each other, a side plate 102 disposed between ends of the two stainless steel plates 101, and a bottom plate 103 disposed between bottoms of the two stainless steel plates 101, and a mold cavity 104 is formed between the two stainless steel plates 101, the side plate 102, and the bottom plate 103. The side plates 102 and the bottom plate 103 are made of the same material as the base carbon steel of the composite plate, the thicknesses of the side plates 102 and the bottom plate 103 of the stainless steel mould are 5-20mm, the surface of each plate of the stainless steel mould is finished before welding, the distance between the inner walls of the two stainless steel plates 101 is equal to the thickness of the base carbon steel plate, the external dimension of the mould after welding is consistent with the requirement of the composite plate product, and the negative deviation of the dimension is less than 0.1 mm.
As shown in fig. 4, the utility model discloses be convenient for the transportation on the one hand through setting up the centre gripping mould in the preparation process, on the other hand centre gripping mould plays the deformation of prevention stainless steel mould drum tripe, promotes multiple layer surface quality. The clamping die is preferably made of a material with high strength in terms of material selection so as to prevent deformation in the preparation process, and carbon structural steel Q235 can be adopted from the viewpoint of cost. In the heating process, because the composite sheet structure is six rectangular plate materials, the heat dissipation is very fast in the apex angle, therefore, in the heating process, the heating density to the apex angle can be increased, thereby ensuring that the overall performance is even. The wall thickness of the clamping mould is 10-50cm, the clamping mould comprises a clamping side plate 106 arranged on the outer wall surface of the stainless steel plate 101, a clamping side plate 107 arranged on the outer wall surface of the side plate 102 and a clamping bottom plate 108 arranged on the outer wall surface of the bottom plate 103, and the clamping side plate 106 is connected with the clamping side plate 107 through bolts, and the clamping side plate 106 is connected with the clamping bottom plate 108 through bolts. The clamping side plates 106, the clamping side plates 107 and the clamping bottom plate 108 together form a clamping cavity for placing the stainless steel mold, and the size of the clamping cavity is matched with that of the stainless steel mold. The material used for each plate is Q235 or higher grade carbon structural steel. All surfaces of the inner wall of the clamping mould are finished, so that the stainless steel mould is just placed into a clamping cavity of the clamping mould, the positive deviation of the size is less than 0.1mm, the height direction of the clamping mould is not lower than that of the stainless steel mould, and molten steel overflow during pouring is avoided.
In order to improve the heat preservation effect, the utility model discloses in, the heat preservation rising head is installed to stainless steel mould top. The internal quality of the casting and the compactness of the casting are improved through the heat-insulating riser, and the condition that the poured product is shrunk at high temperature and has regular appearance is ensured. And after the pouring is finished, cutting off a dead head on the die after the die is completely cooled, and then carrying out subsequent heat treatment processing.
Fig. 5 is a schematic diagram of the mold assembly 10 after casting and composite molding, wherein the stainless steel mold and the internally solidified carbon steel are the produced double-layer stainless steel/carbon steel composite plate. The mold assembly 10 is conveyed to a heat treatment area through a mold transport vehicle, the composite plate is lifted into a heat treatment tank for quenching, the bolt is opened for demolding, a dead head is cut after complete cooling, surface oxide skin is removed, the composite plate is ready to be conveyed to a heating furnace 1 or directly rolled, and the clamping mold can be put into use again after the inner wall oxide skin is removed.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. A stainless steel/carbon steel composite board pouring system is characterized by comprising a heating furnace (1), a travelling crane channel (2), a pouring ladle (3), a molten steel treatment station (4) for heating molten steel in the pouring ladle (3), a tundish (5) and a liquid level detection device; the travelling crane channel (2) is arranged above the heating furnace (1) and used for transporting a casting ladle (3), the casting ladle (3) is movably arranged on the travelling crane channel (2), and the tundish (5) is arranged below the casting ladle (3);
the bottom of watering package (3) be equipped with the corresponding sliding gate (6) of middle package (5), the bottom of middle package (5) is equipped with long mouth of a river (7) of intercommunication middle package (5) and heating furnace (1), long mouth of a river (7) are located one side of middle package (5) is equipped with stopper stick accuse and flows device (8), long mouth of a river (7) are located the opposite side of heating furnace (1) is equipped with water conservancy diversion carbon steel pipe (9), liquid level detection device sets up in preparing the stainless steel mould of stainless steel carbon steel composite sheet, the stainless steel mould is located in pouring process heating furnace (1).
2. The pouring system for stainless steel/carbon steel composite plates according to claim 1, characterized in that a heating system and an atmosphere protection system are arranged in the heating furnace (1).
3. A system for producing stainless steel/carbon steel composite panels, comprising the gating system of claim 1 or 2, further comprising a mold assembly (10), a mold transport platform (11), and a heat treatment mechanism;
the mould transport platform (11) comprises a guide rail (110) and a mould conveying vehicle (111) connected to the guide rail (110) in a matched mode, the mould assembly (10) is located in the mould conveying vehicle (111), the guide rail (110) transversely penetrates through the heating furnace (1) and extends into the heat treatment mechanism, the mould conveying vehicle (111) corresponds to the pouring system, and the mould assembly (10) corresponds to the diversion carbon steel pipe (9).
4. A system for producing stainless steel/carbon steel composite panels according to claim 3, wherein said mold assembly (10) comprises a stainless steel mold and a holding mold attached to the periphery of said stainless steel mold.
5. The production system of a stainless steel/carbon steel composite plate according to claim 4, wherein the stainless steel mold comprises two stainless steel plates (101) arranged oppositely, an edge plate (102) arranged between the ends of the two stainless steel plates (101), and a bottom plate (103) arranged between the bottoms of the two stainless steel plates (101), and the two stainless steel plates (101), the edge plate (102) and the bottom plate (103) together form a mold cavity (104).
6. The production system of a stainless steel/carbon steel composite plate according to claim 5, wherein the clamping mold comprises a clamping side plate (106) arranged on the outer wall surface of the stainless steel plate (101), a clamping side plate (107) arranged on the outer wall surface of the side plate (102), and a clamping bottom plate (108) arranged on the outer wall surface of the bottom plate (103), and the clamping side plate (106) and the clamping side plate (107) and the clamping side plate (106) and the clamping bottom plate (108) are connected through bolts.
7. The production system of stainless steel/carbon steel composite plate according to claim 6, wherein the clamping side plates (106), the clamping side plates (107) and the clamping bottom plate (108) together form a clamping cavity for placing the stainless steel mold, and the size of the clamping cavity is matched with the size of the stainless steel mold.
8. A production system of stainless steel/carbon steel composite plates according to claim 6 or 7, characterized in that a spreader (109) is provided on the clamping side plate (106).
9. The system for producing a stainless steel/carbon steel composite plate according to claim 5, wherein an insulating riser is installed above the stainless steel mold.
10. The system for producing stainless steel/carbon steel composite plates according to claim 3, wherein the heat treatment means employs a heat treatment bath.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020093743.9U CN211938996U (en) | 2020-01-16 | 2020-01-16 | Stainless steel/carbon steel composite board gating system and production system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020093743.9U CN211938996U (en) | 2020-01-16 | 2020-01-16 | Stainless steel/carbon steel composite board gating system and production system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211938996U true CN211938996U (en) | 2020-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020093743.9U Expired - Fee Related CN211938996U (en) | 2020-01-16 | 2020-01-16 | Stainless steel/carbon steel composite board gating system and production system |
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| Country | Link |
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| CN (1) | CN211938996U (en) |
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2020
- 2020-01-16 CN CN202020093743.9U patent/CN211938996U/en not_active Expired - Fee Related
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