CN108950397B - Corrosion-resistant metal coating of 20CrMnMoA steel bevel gear shaft - Google Patents
Corrosion-resistant metal coating of 20CrMnMoA steel bevel gear shaft Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/28—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for plain shafts
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- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/131—Wire arc spraying
Abstract
The invention provides a corrosion-resistant metal coating of a 20CrMnMoA steel bevel gear shaft, which comprises the following chemical element components in percentage by mass: c: 0.17% -0.23%, Si: 0.17% -0.37%, Mn: 0.8% -1.3%, Cr: 1.0% -1.3%, Ti: 0.04% -0.12%, Mo: 0.20% -0.30%, Ni < 0.03%, Cu < 0.03%, P < 0.035%, S < 0.035%, the balance being iron; the corrosion-resistant metal coating comprises the following chemical element components in percentage by mass: c: 0.08-0.10%, Cr: 20-30%, Ni: 12.25-15.43%, Al 1.5-3%, Ti 0.1-0.2%, Cu: 0.3-0.5%, Mg: 0.13-0.15%, Re 0.3-0.5%, La: 0.32-0.38%, Ce: 0.2-0.52%, the balance being iron; the corrosion-resistant metal coating is prepared by preparing powder core wires, performing surface treatment, spraying and secondary tempering. The corrosion-resistant metal coating can improve the corrosion resistance and the wear resistance of the bevel gear shaft and prolong the service life of the bevel gear shaft.
Description
Technical Field
The invention relates to the technical field of improving the corrosion resistance and the wear resistance of mechanical parts, in particular to a corrosion-resistant metal coating of a 20CrMnMoA steel bevel gear shaft.
Background
Corrosion is a slow chemical or electrochemical process, which refers to the natural phenomenon of the metal material acting with oxygen, water, etc. to cause its own failure and destruction. Because the transmission part needs long-term operation, the temperature of operation is high, and the air is moist, causes the corruption to parts such as transmission shaft and drive gear to the problem that leads to the equipment to damage has brought huge loss for production. Therefore, it is necessary to spray a layer of anti-corrosion metal coating on the transmission component to improve the corrosion resistance of the transmission component and prolong the service life of the transmission component. However, different spraying processes can affect the porosity of the metal coating, and the influence of the porosity on the performance of the metal coating is crucial, the general spraying process of the anti-corrosion metal coating only sprays the surface of the transmission part, and is not improved by combining the forging process of the transmission part, the porosity of the sprayed anti-corrosion coating is large, and further the compactness of the metal coating is poor, the corrosion resistance of the metal coating is not strong, and the requirement of the corrosion resistance of the transmission part cannot be met. Therefore, there is a need to develop a new corrosion-resistant metal coating for transmission components.
Disclosure of Invention
The invention aims to provide a corrosion-resistant metal coating of a 20CrMnMoA steel bevel gear shaft, aiming at improving the corrosion resistance and the wear resistance of the bevel gear shaft and further prolonging the service life of the bevel gear shaft.
The invention provides a corrosion-resistant metal coating of a 20CrMnMoA steel bevel gear shaft, which comprises the following chemical element components in percentage by mass: c: 0.17% -0.23%, Si: 0.17% -0.37%, Mn: 0.8% -1.3%, Cr: 1.0% -1.3%, Ti: 0.04% -0.12%, Mo: 0.20% -0.30%, Ni < 0.03%, Cu < 0.03%, P < 0.035%, S < 0.035%, the balance being iron; the corrosion-resistant metal coating comprises the following chemical element components in percentage by mass: c: 0.08-0.10%, Cr: 20-30%, Ni: 12.25-15.43%, Al 1.5-3%, Ti 0.1-0.2%, Cu: 0.3-0.5%, Mg: 0.13-0.15%, Re 0.3-0.5%, La: 0.32-0.38%, Ce: 0.2-0.52%, the balance being iron; the treatment process of the corrosion-resistant metal coating is carried out according to the following steps:
step S1: preparing a powder core wire material: mixing, molding and drawing C, Cr, Ni, Al, Ti, Cu, Mg, Re and La to obtain powder core wires;
step S2: surface treatment: after two-stage quenching, the 20CrMnMoA steel bevel gear shaft is placed into an RX3 box-type electric furnace for primary tempering treatment;
step S3: the spraying process comprises the following steps: immediately spraying the powder core wire to the surface of the gear to form a corrosion-resistant metal coating after the 20CrMnMoA steel bevel gear shaft is tempered for the first time;
step S4: and (3) tempering for the second time: and then carrying out secondary tempering treatment on the sprayed 20CrMnMoA steel bevel gear shaft.
As a further improvement of the present invention, the process of the first tempering treatment in step S2 is: the tempering temperature is 500-650 ℃, the temperature is kept for 2h, and the oil is cooled to the room temperature.
As a further improvement of the present invention, the process of the second tempering treatment in step S4 is: the tempering temperature is 650 plus 700 ℃, the temperature is kept for 1.5h, and the air is blown and cooled to the room temperature.
As a further improvement of the present invention, the spraying process parameters in step S3 are: the voltage is 28-30V, the current is 160-240A, the spraying distance is 80-100mm, and the pressure of compressed air is 0.4-0.6 MPa.
As a further improvement of the present invention, the spraying process parameters in step S3 are: the voltage is 30V, the current is 220A, the spraying distance is 80mm, and the pressure of compressed air is 0.4 MPa.
As a further improvement of the invention, the corrosion-resistant metal coating comprises the following components in percentage by mass: c: 0.09-0.10%, Cr: 25-30%, Ni: 14.25-15.43%, Al 2.0-3%, Ti 0.15-0.2%, Cu: 0.4-0.5%, Mg: 0.14-0.15%, Re 0.4-0.5%, La: 0.35-0.38%, Ce: 0.35-0.52%, the balance being iron.
As a further improvement of the invention, the thickness of the corrosion-resistant metal coating is: 0.3-0.5 mm.
Compared with the prior art, the invention has the following beneficial effects:
1. the method is different from the common spraying process of spraying the anti-corrosion metal coating on the surface of the finished transmission part, is improved by combining the production heat treatment process when the finished transmission part is not formed, and has the advantages of small porosity of the sprayed anti-corrosion coating, high compactness of the metal coating and high anti-stripping strength of the metal coating, so that the obtained anti-corrosion metal coating has high anti-corrosion performance.
2. According to the invention, the bevel gear shaft is sprayed after the first tempering, the stay time of the anti-corrosion metal coating and the bevel gear shaft at high temperature is long, elements such as Cr, C, Ni and Ce in the anti-corrosion metal coating are transferred into the bevel gear shaft, and then the elements transferred into the bevel gear shaft play a role after the second tempering, the element Ce refines the internal structure of the bevel gear shaft, internal stress is eliminated, cracks after quenching are repaired, the content limit of the elements such as Cr, C and Ce in the forging process of the bevel gear shaft is also enlarged, the content of the elements such as Cr, C and Ni in the bevel gear shaft is increased in a coating mode, and the hardness, strength and toughness of the bevel gear shaft are improved.
3. The rare earth element Ce is adopted, the structure performance of the material can be obviously improved, the grain refinement degree is improved, the compactness of the powder core wire is increased, the pores on the surface of the coating are further reduced, the coating is sprayed on the high-temperature surface after the first tempering to form the coating, the time of the coating contacting with a high-temperature matrix is long, the element Ce permeates into the bevel gear shaft, the grains of the bevel gear shaft are finer and more disordered, the original austenite grains are effectively segmented, the growth space of the second tempering phase change structure is limited, the refined structure is achieved, the substructure in the original austenite grains is diversified, and the impact toughness of the bevel gear shaft is increased.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
The invention discloses a corrosion-resistant metal coating of a 20CrMnMoA steel bevel gear shaft, and a specific implementation mode is as follows.
Example 1
The invention provides a corrosion-resistant metal coating of a 20CrMnMoA steel bevel gear shaft, which comprises the following chemical element components in percentage by mass: c: 0.17% -0.23%, Si: 0.17% -0.37%, Mn: 0.8% -1.3%, Cr: 1.0% -1.3%, Ti: 0.04% -0.12%, Mo: 0.20% -0.30%, Ni < 0.03%, Cu < 0.03%, P < 0.035%, S < 0.035%, the balance being iron; the corrosion-resistant metal coating comprises the following chemical element components in percentage by mass: c: 0.08%, Cr: 20%, Ni: 12.25%, Al 1.5%, Ti 0.1%, Cu: 0.3%, Mg: 0.13%, Re: 0.3%, La: 0.32%, Ce: 0.2%, the balance being iron; the treatment process of the corrosion-resistant metal coating is carried out according to the following steps:
step S1: preparing a powder core wire material: mixing, molding and drawing C, Cr, Ni, Al, Ti, Cu, Mg, Re and La to obtain powder core wires;
step S2: surface treatment: after two-stage quenching, the 20CrMnMoA steel bevel gear shaft is placed into an RX3 box-type electric furnace to be subjected to first tempering treatment with the tempering temperature of 500 ℃, heat preservation for 2 hours and oil cooling to room temperature;
step S3: the spraying process comprises the following steps: immediately spraying the powder core wire material on the surface of the gear to form a corrosion-resistant metal coating under the conditions that the parameters are 28-30V of voltage, 160-240A of current, 80-100mm of spraying distance and 0.4-0.6MPa of compressed air pressure after primary tempering of the 20CrMnMoA steel bevel gear shaft, wherein the thickness of the corrosion-resistant coating is 0.3 mm;
step S4: and (3) tempering for the second time: and then carrying out secondary tempering treatment on the sprayed 20CrMnMoA steel bevel gear shaft, wherein the tempering temperature is 650 ℃, the heat preservation time is 1.5h, and the temperature is cooled to the room temperature by blast air.
Example 2
The invention provides a corrosion-resistant metal coating of a 20CrMnMoA steel bevel gear shaft, which comprises the following chemical element components in percentage by mass: c: 0.17% -0.23%, Si: 0.17% -0.37%, Mn: 0.8% -1.3%, Cr: 1.0% -1.3%, Ti: 0.04% -0.12%, Mo: 0.20% -0.30%, Ni < 0.03%, Cu < 0.03%, P < 0.035%, S < 0.035%, the balance being iron; the corrosion-resistant metal coating comprises the following chemical element components in percentage by mass: c: 0.10%, Cr: 30%, Ni: 15.43%, Al 3%, Ti 0.2%, Cu: 0.5%, Mg: 0.15%, Re 0.5%, La: 0.38%, Ce: 0.52%, the balance being iron; the treatment process of the corrosion-resistant metal coating is carried out according to the following steps:
step S1: preparing a powder core wire material: mixing, molding and drawing C, Cr, Ni, Al, Ti, Cu, Mg, Re and La to obtain powder core wires;
step S2: surface treatment: after two-stage quenching, the 20CrMnMoA steel bevel gear shaft is placed into an RX3 box type electric furnace to be subjected to first tempering treatment with the tempering temperature of 650 ℃, heat preservation for 2 hours and oil cooling to room temperature;
step S3: the spraying process comprises the following steps: immediately spraying the powder core wire material on the surface of the gear to form a corrosion-resistant metal coating under the conditions that the parameters are 28-30V of voltage, 160-240A of current, 80-100mm of spraying distance and 0.4-0.6MPa of compressed air pressure after primary tempering of the 20CrMnMoA steel bevel gear shaft, wherein the thickness of the corrosion-resistant coating is 0.5 mm;
step S4: and (3) tempering for the second time: and then carrying out secondary tempering treatment on the sprayed 20CrMnMoA steel bevel gear shaft, wherein the tempering temperature is 700 ℃, the heat preservation time is 1.5h, and the temperature is cooled to the room temperature by blast air.
Example 3
The invention provides a corrosion-resistant metal coating of a 20CrMnMoA steel bevel gear shaft, which comprises the following chemical element components in percentage by mass: c: 0.17% -0.23%, Si: 0.17% -0.37%, Mn: 0.8% -1.3%, Cr: 1.0% -1.3%, Ti: 0.04% -0.12%, Mo: 0.20% -0.30%, Ni < 0.03%, Cu < 0.03%, P < 0.035%, S < 0.035%, the balance being iron; the corrosion-resistant metal coating comprises the following chemical element components in percentage by mass: c: 0.09%, Cr: 25%, Ni: 14.25%, Al 2%, Ti 0.15%, Cu: 0.4%, Mg: 0.14%, Re: 0.4%, La: 0.35%, Ce: 0.35%, the balance being iron; the treatment process of the corrosion-resistant metal coating is carried out according to the following steps:
step S1: preparing a powder core wire material: mixing, molding and drawing C, Cr, Ni, Al, Ti, Cu, Mg, Re and La to obtain powder core wires;
step S2: surface treatment: after two-stage quenching, the 20CrMnMoA steel bevel gear shaft is placed into an RX3 box-type electric furnace to be subjected to first tempering treatment with the tempering temperature of 600 ℃, heat preservation for 2 hours and oil cooling to room temperature;
step S3: the spraying process comprises the following steps: immediately spraying the powder core wire material on the surface of the gear to form a corrosion-resistant metal coating under the conditions that the parameters are 28-30V of voltage, 160-240A of current, 80-100mm of spraying distance and 0.4-0.6MPa of compressed air pressure after primary tempering of the 20CrMnMoA steel bevel gear shaft, wherein the thickness of the corrosion-resistant coating is 0.4 mm;
step S4: and (3) tempering for the second time: and then carrying out secondary tempering treatment on the sprayed 20CrMnMoA steel bevel gear shaft, wherein the tempering temperature is 680 ℃, keeping the temperature for 1.5h, and carrying out air blast cooling to the room temperature.
The prepared bevel gear shaft is selected as a sample to be tested for adhesion performance according to GB/T9286-1998, the salt water resistance performance is tested according to the GB1763-1989 standard normal temperature salt water resistance method, and the salt spray resistance performance is tested according to the GB/T1771-1991 standard, and the results are as follows: table 1 shows the results of the corrosion resistance test of the bevel gear shaft.
TABLE 1 performance index of bevel gear shaft
The results of examples 1-3 show that the corrosion-resistant metal coating provided by the invention has good adhesion performance and high salt water and salt mist resistance.
The corrosion-resistant metal coating of the 20CrMnMoA steel bevel gear shaft is provided by the invention. The principles and embodiments of the present invention are explained herein using specific examples, which are set forth only to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (1)
1. The utility model provides a corrosion-resistant metal coating of 20CrMnMoA steel bevel gear axle which characterized in that: the 20CrMnMoA steel bevel gear shaft comprises the following chemical element components in percentage by mass: c: 0.17% -0.23%, Si: 0.17% -0.37%, Mn: 0.8% -1.3%, Cr: 1.0% -1.3%, Ti: 0.04% -0.12%, Mo: 0.20-0.30%, Ni < 0.03%, Cu < 0.03%, P < 0.035%, S < 0.035%, and the balance of iron; the corrosion-resistant metal coating comprises the following chemical element components in percentage by mass: c: 0.09-0.10%, Cr: 25-30%, Ni: 14.25-15.43%, Al 2.0-3%, Ti 0.15-0.2%, Cu: 0.4-0.5%, Mg: 0.14-0.15%, Re 0.4-0.5%, La: 0.35-0.38%, Ce: 0.35-0.52%, the rest is iron; the treatment process of the corrosion-resistant metal coating is carried out according to the following steps:
step S1: preparing a powder core wire material: mixing, molding and drawing C, Cr, Ni, Al, Ti, Cu, Mg, Re and La to obtain powder core wires;
step S2: surface treatment: after two-stage quenching, the 20CrMnMoA steel bevel gear shaft is placed into an RX3 box-type electric furnace for primary tempering treatment, and the process of the primary tempering treatment in the step S2 comprises the following steps: the tempering temperature is 500-650 ℃, the temperature is kept for 2h, and the oil is cooled to the room temperature;
step S3: the spraying process comprises the following steps: the 20CrMnMoA steel bevel gear shaft after the first tempering immediately sprays the powder core wire to the surface of the gear to form a corrosion-resistant metal coating, and the parameters of the spraying process are as follows: the voltage is 30V, the current is 220A, the spraying distance is 80mm, and the pressure of compressed air is 0.4 MPa;
step S4: and (3) tempering for the second time: then carrying out secondary tempering treatment on the sprayed 20CrMnMoA steel bevel gear shaft, wherein the tempering temperature is 650-700 ℃, keeping the temperature for 1.5h, and carrying out air blast cooling to the room temperature;
the thickness of the corrosion-resistant metal coating is as follows: 0.3-0.5 mm.
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| WO2017142430A1 (en) * | 2016-02-15 | 2017-08-24 | Общество с ограниченной ответственностью "Технологические системы защитных покрытий" | Composition of a corrosion resistant coating for protecting petrochemical equipment |
| WO2018096387A1 (en) * | 2016-11-24 | 2018-05-31 | Arcelormittal | Hot-rolled and coated steel sheet for hot-stamping, hot-stamped coated steel part and methods for manufacturing the same |
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| CN107457710B (en) * | 2017-09-26 | 2024-02-13 | 江苏飞腾铸造机械有限公司 | Shot blasting machine roller way with device for preventing shot from leaking |
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| WO2017142430A1 (en) * | 2016-02-15 | 2017-08-24 | Общество с ограниченной ответственностью "Технологические системы защитных покрытий" | Composition of a corrosion resistant coating for protecting petrochemical equipment |
| WO2018096387A1 (en) * | 2016-11-24 | 2018-05-31 | Arcelormittal | Hot-rolled and coated steel sheet for hot-stamping, hot-stamped coated steel part and methods for manufacturing the same |
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Denomination of invention: A corrosion resistant metal coating for 20CrMnMoA steel bevel gear shaft Effective date of registration: 20220523 Granted publication date: 20210302 Pledgee: Bank of China Limited Xiangyang Branch Pledgor: HUBEI WEINENGDA TRANSMISSION CO.,LTD. Registration number: Y2022980006104 |
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