CN115418551A - F690-grade steel plate matched welding wire steel wire rod and production method thereof - Google Patents
F690-grade steel plate matched welding wire steel wire rod and production method thereof Download PDFInfo
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Abstract
The invention provides a wire rod matched with an F690-grade steel plate and a production method thereof, wherein a converter small square billet one-fire forming process route is adopted, and the superheat degree and electromagnetic stirring are controlled, so that the internal quality of a casting blank is favorably improved, the metallographic structure is uniform, and the inclusion and segregation degree are reduced; and the controlled rolling and controlled cooling process is adjusted to ensure that the steel wire has a structure suitable for drawing, the occurrence of abnormal structures such as upper bainite, martensite and the like is reduced, the elongation and the surface shrinkage of the steel wire are improved, and the drawing processing of a user is facilitated. The invention can meet the welding performance of F690 steel plates, the deposited metal mechanics, impact and crack resistance of the steel plates meet the requirements, and the blank of related welding materials in China is filled.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a wire rod of a welding wire matched with an F690-grade steel plate and a production method thereof.
Background
F690 ship and maritime work steel is an important steel material for supporting the implementation of the ocean power strategy in China, faces the development direction of ship and maritime work equipment from shallow sea to deep sea and offshore to polar regions, and needs to meet the high-safety service requirements under extremely severe environments such as low temperature, hurricane, heavy wave, corrosion and the like.
For F69O grade steel plates, as postweld heat treatment is needed, the temperature is 520 ℃ multiplied by 2h, the harsh requirement is 620 ℃ multiplied by 2h, the impact requirement is-60 ℃ is not less than 46J, the CTOD (-35 ℃) is not less than 0.2, and no matched wire welding steel success cases exist at home and abroad at present. At present, only welding rods of steel pass all experiments, foreign brands of submerged arc welding wires cannot meet requirements, the domestic brands have certain difference in low impact and CTOD data and are not formally evaluated, and therefore a welding material matched with an F690-grade steel plate is urgently needed at present, and the domestic blank is filled.
Disclosure of Invention
In view of the above technical problems, an object of one embodiment of the present invention is to provide a wire rod for a welding wire used in cooperation with an F690-class steel plate, which can satisfy welding performance of the F690-class steel plate, and meet requirements for deposited metal mechanics, impact and crack resistance, thereby filling up a domestic gap for related welding materials.
One of the purposes of one mode of the invention is to provide a production method of an F690-grade steel plate matched welding wire steel wire rod, which adopts a converter billet one-fire forming process route and produces the F690-grade steel plate matched welding wire steel wire rod through reasonable smelting and rolling process technologies.
Note that the description of these objects does not preclude the existence of other objects. It is not necessary for one embodiment of the invention to achieve all of the above objectives. Objects other than the above-described objects can be extracted from the descriptions of the specification, the drawings, and the claims.
The present invention achieves the above-described object by the following technical means.
A production method of the F690-grade steel plate matched welding wire steel wire rod comprises the following steps:
step S1, steel-making BOF: steelmaking using a basic oxygen furnace steelmaking process, wherein the steelmaking adopts a MnNiCrMo main alloy system, 0.04 to 0.08 percent of Ti is added for microalloying, and the tapping components are controlled by the converter end point: c is less than or equal to 0.04 percent, P is less than or equal to 0.006 percent, and the tapping temperature is more than or equal to 1580 ℃; carrying out deoxidation alloying control and refining slagging process control during tapping, and providing qualified initial molten steel components, temperature and slag for refining;
step S2, an LF refining furnace: supplementing a slagging material after an LF refining furnace enters a station, wherein the slagging material comprises 4-8kg/t and 0-3kg/t fluorite of lime, the basicity R of slag is 2.0-5.0, calcium carbide and ferrosilicon powder with the weight percentage of 1:3 are adopted for diffusion deoxidation in the refining process, a small amount of the calcium carbide and ferrosilicon powder is added on a slag surface for multiple times, the total adding amount is 2.0-2.5 kg/t, the C content target +/-0.01%, and the Mn, ni, cr and Mo element content target +/-0.02%, and the components are refined, slagging, deoxidation and fine adjustment to ensure that the components are qualified, and steel inclusions are effectively reduced;
step S3, casting blank casting: casting blanks are cast by adopting a continuous casting machine, and the parameters of the casting process are as follows: the superheat degree is 30 to 45 ℃, the drawing speed is 2.0 to 2.2m/s, the secondary cooling system is 0.8 to 1.0L/kg, the current intensity is 300 to 400A, the frequency is 3 to 4Hz, and the electromagnetic stirring parameters at the tail end are as follows: the current intensity is 250 to 300A, the frequency is 8 to 10Hz, the internal quality of a casting blank is effectively improved, and the inclusion and segregation degree are reduced;
step S4, pit cooling: the temperature of the steel billet entering the pit is 450-550 ℃; the pit cooling time is more than or equal to 24 hours, and the pit discharging temperature is less than or equal to 200 ℃;
s5, performing shot blasting flaw detection and grinding;
s6, rolling the wire rod, wherein the parameters of the rolling process are as follows: the air-fuel ratio of the furnace gas is 0.5 to 0.6, the temperature range of a soaking section is 1100 to 1160 ℃, the rolling temperature is 960 to 1080 ℃, the finishing temperature is 830 to 900 ℃, the spinning temperature is 820 to 850 ℃, the temperature of a heat-insulating cover is 460 to 550 ℃, the coiling temperature is 320 to 500 ℃, the uniformity of a coil tissue is effectively improved, and the drawing processing of a user is facilitated;
and S7, detecting and warehousing the qualified product.
In the scheme, the steel making in the step S1 adopts a MnNiCrMo main alloy system, and 0.04 percent of Ti is added for microalloying.
In the above scheme, the step S1 of controlling the tapping components through the converter end point comprises: c:0.02%, P:0.003%, tapping temperature: 1580 deg.C; and carrying out deoxidation alloying control and refining slagging process control during tapping.
In the scheme, the slag making materials are added after the LF refining furnace enters the station in the step S2, and the components of the slag making materials are 4kg/t lime and 1kg/t fluorite, so that the slag has good fluidity and the alkalinity R is 2.0; in the refining process, calcium carbide and ferrosilicon powder with the weight percentage of 1:3 are adopted for diffusion deoxidation, a small amount of the calcium carbide and the ferrosilicon powder are added on the slag surface for many times, and the total adding amount is 2.0kg/t; the content of C is +/-0.01%, and the content of Mn, ni, cr and Mo is +/-0.02%.
In the above scheme, in the step S3, a 160-square continuous casting machine is used for casting the casting blank, and the casting process parameters of the casting blank are as follows: the superheat degree is 30 ℃, the pulling speed is 2.0m/s, the secondary cooling system is 0.8L/kg, the current intensity is 300A, and the frequency is 3Hz; the parameters of the electromagnetic stirring at the tail end are as follows: the current intensity is 250A, and the frequency is 8Hz.
In the scheme, the pit entering temperature of the steel billet in the step S4 is 480 ℃; the pit cooling time is 25h, and the pit discharging temperature is 200 ℃.
In the above scheme, the rolling process parameters of the wire rod rolling in the step S6 are as follows: the furnace gas-air ratio is 0.51, the temperature range of the soaking section is 1100 ℃, the initial rolling temperature is 960 ℃, the final rolling temperature is 830 ℃, the spinning temperature is 820 ℃, the temperature of the heat-preserving cover is 460 ℃ and the coiling temperature is 320 ℃.
The F690-grade steel plate matched welding wire steel wire rod prepared by the production method of the F690-grade steel plate matched welding wire steel wire rod comprises the following chemical components in percentage by weight: c:0.06 to 0.10%, si:0.15 to 0.30%, mn:1.40 to 1.75 percent, less than or equal to 0.010 percent of P, less than or equal to 0.008 percent of S, cr:0.30 to 0.40%, ni:2.80 to 3.00%, cu is less than or equal to 0.15%, mo:0.40 to 0.60%, ti:0.04 to 0.08 percent, less than or equal to 0.010 percent of V, less than or equal to 0.015 percent of Al, less than or equal to 0.008 percent of Nb, less than or equal to 0.008 percent of B, and the balance of Fe and inevitable impurities.
In the scheme, the F690-grade steel plate matched welding wire steel wire rod comprises the following chemical components in percentage by weight: c:0.07%, si:0.20%, mn:1.54%, P:0.012%, S:0.003%, cr:0.34%, ni:2.87%, cu:0.022%, mo:0.49%, ti:0.060%, V:0.008%, al:0.007%, nb:0.0009%, B:0.0003%, the balance being Fe and unavoidable impurities.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts a converter small square billet one-fire forming process route, is beneficial to improving the internal quality of a casting blank by controlling the degree of superheat and electromagnetic stirring, has uniform metallographic structure and reduces the inclusion and segregation degree; and the controlled rolling and controlled cooling process is adjusted to ensure that the steel wire has a structure suitable for drawing, the occurrence of abnormal structures such as upper bainite, martensite and the like is reduced, the elongation and the surface shrinkage of the steel wire are improved, and the drawing processing of a user is facilitated.
According to one mode of the invention, the welding wire steel wire rod matched with the F690 steel plate is provided, the welding performance of the F690 steel plate can be met, the deposited metal mechanics, impact and crack resistance of the welding wire steel wire rod meet the requirements, and the blank of related welding materials in China is filled.
According to one mode of the invention, the production method of the F690-grade steel plate matched welding wire steel wire rod is provided, a converter small square billet one-fire material forming process route is adopted, and the F690-grade steel plate matched welding wire steel wire rod is produced through reasonable smelting and rolling process technologies.
Note that the description of these effects does not hinder the existence of other effects. One embodiment of the present invention does not necessarily have all the effects described above. Effects other than the above can be clearly seen and extracted from the descriptions of the specification, the drawings, the claims, and the like.
Drawings
Fig. 1 is a view schematically showing a metallographic structure of an embodiment of the present invention magnified 500 times, wherein (a) is an edge metallographic structure of an embodiment of the present invention magnified 500 times, (b) is a 1/2R metallographic structure of an embodiment of the present invention magnified 500 times, and (c) is a core metallographic structure of an embodiment of the present invention magnified 500 times;
FIG. 2 is a graphical illustration of a same-circle mechanical project of an embodiment of the present invention;
FIG. 3 is a graph of a wash low power sample of one embodiment of the present invention, wherein (a) is a 1-stream wash low power sample detection graph, (b) is a 2-stream wash low power sample detection graph, (c) is a 3-stream wash low power sample detection graph, and (d) is a 4-stream wash low power sample detection graph.
Detailed Description
The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
An F690 grade steel plate matched welding wire steel wire rod takes steel types Q80M-G as an example, and the chemical components of the steel wire rod are as follows by weight percent: c:0.07%, si:0.20%, mn:1.54%, P:0.012%, S:0.003%, cr:0.34%, ni:2.87%, cu:0.022%, mo:0.49%, ti:0.060%, V:0.008%, al:0.007%, nb:0.0009%, B:0.0003%, the balance being Fe and unavoidable impurities.
The production method of the F690 grade steel plate matched welding wire steel wire rod comprises the following steps:
step S1, steel-making BOF: steelmaking using a basic oxygen furnace steelmaking process, wherein the steelmaking adopts a MnNiCrMo main alloy system, 0.04 to 0.08 percent of Ti is added for microalloying, and the tapping components are controlled by the converter end point: c is less than or equal to 0.04 percent, P is less than or equal to 0.006 percent, and the tapping temperature is more than or equal to 1580 ℃; carrying out deoxidation alloying control and refining slagging process control during tapping;
step S2, an LF refining furnace: supplementing a slag making material after an LF refining furnace enters a station, wherein the slag making material comprises 4-8kg/t of lime and 0-3kg/t of fluorite, the basicity R of slag is 2.0-5.0, calcium carbide and ferrosilicon powder with the weight percentage of 1:3 are adopted for diffusion deoxidation in the refining process, a small amount of the calcium carbide and ferrosilicon powder is added on a slag surface for multiple times, the total adding amount is 2.0-2.5 kg/t, the C content is +/-0.01%, and the Mn, ni, cr and Mo element content is +/-0.02%;
step S3, casting blank casting: casting blanks are cast by adopting a continuous casting machine, and the parameters of the casting process are as follows: the superheat degree is 30 to 45 ℃, the drawing speed is 2.0 to 2.2m/s, the secondary cooling system is 0.8 to 1.0L/kg, the current intensity is 300 to 400A, the frequency is 3 to 4Hz, and the electromagnetic stirring parameters at the tail end are as follows: the current intensity is 250 to 300A, and the frequency is 8 to 10Hz;
step S4, pit cooling: the pit entry temperature of the steel billet is 450-550 ℃; the pit cooling time is more than or equal to 24 hours, the pit discharging temperature is less than or equal to 200 ℃, the same stack position is placed in the pit, hot blanks are padded at the bottom of the pit, and the left stack position and the right stack position are provided with hot blanks;
s5, performing shot blasting flaw detection and polishing to reduce the defects of surface cracks, scabs and the like;
s6, rolling the wire rod, wherein the parameters of the rolling process are as follows: the air-fuel ratio of furnace gas is 0.5 to 0.6, the temperature range of soaking sections is 1100 to 1160 ℃, the rolling temperature is 960 to 1080 ℃, the finishing temperature is 830 to 900 ℃, the spinning temperature is 820 to 850 ℃, the temperature of a heat insulation cover is 460 to 550 ℃, and the rolling temperature is 320 to 500 ℃;
and S7, detecting and warehousing qualified products.
According to this embodiment, the steel making in step S1 is preferably carried out by microalloying with the addition of 0.04% by weight of Ti, using a MnNiCrMo master alloy system.
According to the present embodiment, preferably, the step S1 of controlling the tapping components at the converter finishing point includes: 0.02 percent of C, 0.003 percent of P and the tapping temperature of 1580 ℃; and carrying out deoxidation alloying control and refining slagging process control during tapping.
According to the embodiment, preferably, after the step S2LF refining furnace enters the refining furnace, a slagging material is added, wherein the slagging material comprises 4kg/t lime and 1kg/t fluorite, so that the slag has good fluidity and the alkalinity R is 2.0; in the refining process, calcium carbide and ferrosilicon powder with the weight percentage of 1:3 are adopted for diffusion deoxidation, a small amount of the calcium carbide and the ferrosilicon powder are added on the slag surface for many times, and the total adding amount is 2.0kg/t; the target content of C is +/-0.01%, and the target content of Mn, ni, cr, mo and other elements is +/-0.02%.
According to this embodiment, preferably, the casting process parameters of the casting blank casting in step S3 are: the superheat degree is 30 ℃, the pulling speed is 2.0m/s, the secondary cooling system is 0.8L/kg, the current intensity is 300A, and the frequency is 3Hz; the terminal electromagnetic stirring parameters are: the current intensity is 250A, and the frequency is 8Hz.
According to the embodiment, preferably, the pit entering temperature of the steel billet in the step S4 is 480 ℃; the pit cooling time is 25h, and the pit discharging temperature is 200 ℃.
Two sample pieces 001-1 and 001-2 of the same furnace lot number 001 were taken, and the degree of segregation was analyzed:
TABLE 1 test data for inclusions and degree of segregation
As shown in Table 1, it can be seen that the control of the degree of superheat and the electromagnetic stirring is beneficial to improving the internal quality of a casting blank, the metallographic structure is uniform, and the inclusion and segregation degree are reduced.
According to this embodiment, preferably, the rolling process parameters of the wire rod rolling in step S6 are: the gas-air ratio of the furnace is 0.51, the temperature range of the soaking section is 1100 ℃, the initial rolling temperature is 960 ℃, the final rolling temperature is 830 ℃, the spinning temperature is 820 ℃, the temperature of the heat-preserving cover is 460 ℃, and the coiling temperature is 320 ℃.
According to the invention, the high-toughness mechanism and the structure regulation and control technology under a low-carbon multi-microalloy component system are adopted to develop the controlled rolling and cold rolling process of the hot-rolled wire rod for the high-toughness welding wire, so that the obtained wire rod has uniform structure and stable mechanical property.
FIG. 1 is a 500-fold enlarged view of a metallographic structure of a rolled number of a wire rod specimen piece 001 of the present invention, wherein (a) is an edge metallographic structure drawing, (b) is a 1/2R metallographic structure drawing, and (c) is a metallographic structure drawing of a core; the drawing shows that the wire rod has uniform tissue, the tissue is F + B, the tissue is uniform and is distributed in a dispersion way, and the drawing processing is facilitated.
Fig. 2 is a graph of the same-circle mechanical project curve of the rolling number of the wire rod sample sheet 001, wherein the tensile strength is 970Mpa, the area shrinkage is 60% and the elongation is 12%, and the wire rod is good in plasticity index and beneficial to drawing processing.
FIG. 3 is a pickling low-power sample detection map of a furnace No. 001, wherein (a) is a 1-stream pickling low-power sample detection map, (b) is a 2-stream pickling low-power sample detection map, (c) is a 3-stream pickling low-power sample detection map, and (d) is a 4-stream pickling low-power sample detection map, it can be seen that the pickling low-power sample has a uniform metallographic structure and good core quality, wherein the center porosity is less than or equal to 0.5 level, the shrinkage cavity is less than or equal to 0.5 level, and the center segregation is less than or equal to 0.5 level.
The toughness of the clad metal in the embodiment 1 is researched, the welding wire is trial-produced by developing a steel wire rod of the welding wire, and the welding test evaluation is carried out on the welding wire;
TABLE 2 deposited metal actual test data
The actual test data of the deposited metal are shown in the table 2, and the test result shows that the welding performance meets the requirements.
According to the production method of the wire rod matched with the F690-grade steel plate, a converter small square billet one-fire forming process route is adopted, and the superheat degree and electromagnetic stirring are controlled, so that the internal quality of a casting blank is improved, the metallographic structure is uniform, and the inclusion and segregation degree are reduced; and the controlled rolling and controlled cooling process is adjusted to ensure that the steel wire has a structure suitable for drawing, the occurrence of abnormal structures such as upper bainite, martensite and the like is reduced, the elongation and the surface shrinkage of the steel wire are improved, and the drawing processing of a user is facilitated. The welding wire steel wire rod matched with the F690 steel plate obtained by the invention can meet the welding performance of the F690 steel plate, the deposited metal mechanics, impact and crack resistance of the welding wire steel wire rod meet the requirements, and the blank of related welding materials in China is filled.
It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above-listed detailed description is only a specific description of possible embodiments of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (9)
1. A production method of welding wire steel wire rods matched with F690-grade steel plates is characterized by comprising the following steps:
step S1, steel-making BOF: carrying out steel making by using a top-blown oxygen converter steel making method, wherein the steel making adopts a MnNiCrMo main alloy system, 0.04 to 0.08 percent of Ti is added for microalloying, and the steel tapping components are controlled by the end point of the converter as follows: c is less than or equal to 0.04 percent, P is less than or equal to 0.006 percent, and the tapping temperature is more than or equal to 1580 percent; carrying out deoxidation alloying control and refining slagging process control during tapping;
step S2, an LF refining furnace: supplementing a slag making material after an LF refining furnace enters a station, wherein the slag making material comprises 4-8kg/t of lime and 0-3kg/t of fluorite, the basicity R of slag is 2.0-5.0, calcium carbide and ferrosilicon powder with the weight percentage of 1:3 are adopted for diffusion deoxidation in the refining process, a small amount of the calcium carbide and ferrosilicon powder is added on a slag surface for multiple times, the total adding amount is 2.0-2.5 kg/t, the C content is +/-0.01%, and the Mn, ni, cr and Mo element content is +/-0.02%;
step S3, casting blank casting: casting blanks are cast by adopting a continuous casting machine, and the parameters of the casting process are as follows: the superheat degree is 30 to 45 ℃, the drawing speed is 2.0 to 2.2m/s, the secondary cooling system is 0.8 to 1.0L/kg, the current intensity is 300 to 400A, the frequency is 3 to 4Hz, and the electromagnetic stirring parameters at the tail end are as follows: the current intensity is 250 to 300A, and the frequency is 8 to 10Hz;
step S4, pit cooling: the pit entry temperature of the steel billet is 450-550 ℃; the pit cooling time is more than or equal to 24 hours, and the pit discharging temperature is less than or equal to 200 ℃;
s5, performing shot blasting flaw detection and grinding;
s6, rolling the wire rod, wherein the parameters of the rolling process are as follows: the air-fuel ratio of the furnace gas is 0.5 to 0.6, the temperature range of a soaking section is 1100 to 1160 ℃, the rolling temperature is 960 to 1080 ℃, the finishing temperature is 830 to 900 ℃, the spinning temperature is 820 to 850 ℃, the temperature of a heat-insulating cover is 460 to 550 ℃, and the rolling temperature is 320 to 500 ℃;
and S7, detecting and warehousing qualified products.
2. The method of producing F690-grade steel plate-supporting welding wire steel wire rod according to claim 1, wherein the step S1 is microalloying by adding 0.04% ti.
3. The method for producing the F690-grade steel plate-supporting welding wire steel wire rod according to claim 1, wherein the step S1 of controlling steel tapping components through a converter end point is: c:0.02%, P:0.003%, tapping temperature: 1580 deg.C.
4. The method for producing the F690-grade steel plate matched welding wire steel wire rod as claimed in claim 1, wherein a slag making material is added after the step S2LF refining furnace enters the station, wherein the components of the slag making material are 4kg/t lime and 1kg/t fluorite, so that the slag has good fluidity and the alkalinity R is 2.0; in the refining process, calcium carbide and ferrosilicon powder with the weight percentage of 1:3 are adopted for diffusion deoxidation, a small amount of the calcium carbide and the ferrosilicon powder are added on the slag surface for many times, and the total adding amount is 2.0kg/t; the content of C is +/-0.01%, and the content of Mn, ni, cr and Mo is +/-0.02%.
5. The method for producing the F690-grade steel plate matched welding wire steel wire rod according to claim 1, wherein the casting blank is cast by a 160-square continuous casting machine in the step S3, and the casting process parameters of the casting blank are as follows: the superheat degree is 30 ℃, the pulling speed is 2.0m/s, the secondary cooling system is 0.8L/kg, the current intensity is 300A, and the frequency is 3Hz; the terminal electromagnetic stirring parameters are: the current intensity is 250A, and the frequency is 8Hz.
6. The method of claim 1, wherein the step S4 steel billet pit entry temperature is 480 ℃; the pit cooling time is 25h, and the pit discharging temperature is 200 ℃.
7. The method for producing the F690-grade steel plate matched welding wire steel wire rod according to claim 1, wherein the rolling process parameters of the step S6 wire rod rolling are as follows: the furnace gas-air ratio is 0.51, the temperature range of the soaking section is 1100 ℃, the initial rolling temperature is 960 ℃, the final rolling temperature is 830 ℃, the spinning temperature is 820 ℃, the temperature of the heat-preserving cover is 460 ℃ and the coiling temperature is 320 ℃.
8. An F690-grade steel plate matched wire-welded steel wire rod is prepared according to the production method of the F690-grade steel plate matched wire-welded steel wire rod of any one of claims 1 to 7, and comprises the following chemical components in percentage by weight: c:0.06 to 0.10%, si:0.15 to 0.30%, mn:1.40 to 1.75 percent, less than or equal to 0.010 percent of P, less than or equal to 0.008 percent of S, cr:0.30 to 0.40%, ni:2.80 to 3.00 percent, less than or equal to 0.15 percent of Cu, mo:0.40 to 0.60%, ti:0.04 to 0.08 percent, less than or equal to 0.010 percent of V, less than or equal to 0.015 percent of Al, less than or equal to 0.008 percent of Nb, less than or equal to 0.008 percent of B, and the balance of Fe and inevitable impurities.
9. The F690 grade steel plate mating welding wire steel wire rod of claim 8, wherein the chemical composition in weight percent is: c:0.07%, si:0.20%, mn:1.54%, P:0.012%, S:0.003%, cr:0.34%, ni:2.87%, cu:0.022%, mo:0.49%, ti:0.060%, V:0.008%, al:0.007%, nb:0.0009%, B:0.0003%, the balance being Fe and unavoidable impurities.
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Denomination of invention: A F690 grade steel plate matching welding wire steel wire rod and its production method Effective date of registration: 20230808 Granted publication date: 20230203 Pledgee: China Construction Bank Zhangjiagang branch Pledgor: JIANGSU YONGGANG GROUP Co.,Ltd. Registration number: Y2023980051346 |