CN208685054U - A kind of preventer with laser cladding layer - Google Patents
A kind of preventer with laser cladding layer Download PDFInfo
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- CN208685054U CN208685054U CN201821184565.XU CN201821184565U CN208685054U CN 208685054 U CN208685054 U CN 208685054U CN 201821184565 U CN201821184565 U CN 201821184565U CN 208685054 U CN208685054 U CN 208685054U
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- cladding layer
- shell
- laser cladding
- preventer
- laser
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- 238000004372 laser cladding Methods 0.000 title claims abstract description 50
- 238000003466 welding Methods 0.000 claims abstract description 39
- 210000000664 rectum Anatomy 0.000 claims abstract description 36
- 230000008018 melting Effects 0.000 claims abstract description 33
- 238000000576 coating method Methods 0.000 claims abstract description 32
- 238000002844 melting Methods 0.000 claims abstract description 17
- 239000011248 coating agent Substances 0.000 claims abstract description 16
- 238000010309 melting process Methods 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 28
- 239000010959 steel Substances 0.000 claims description 28
- 238000005253 cladding Methods 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 8
- 239000003292 glue Substances 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 13
- 238000012545 processing Methods 0.000 abstract description 13
- 239000005864 Sulphur Substances 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 11
- 238000010586 diagram Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 239000012895 dilution Substances 0.000 description 4
- 238000010790 dilution Methods 0.000 description 4
- 238000005553 drilling Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 230000002265 prevention Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000008186 active pharmaceutical agent Substances 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- -1 anti-corrosion Chemical compound 0.000 description 1
- 230000003260 anti-sepsis Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 235000006708 antioxidants Nutrition 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000005552 hardfacing Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Laser Beam Processing (AREA)
Abstract
A kind of preventer with laser cladding layer of the utility model, belong to oil equipment technical field, including shell, there is the latus rectum passed through for well liquid or casing and inner cavity in shell, inner cavity is circumferentially positioned at shell latus rectum periphery or mutually passes through with latus rectum, and key is: the inner cavity and latus rectum surface of the shell, the perishable surface of remaining components are welded with laser cladding layer by laser melting and coating process heap.Such preventer, using laser melting and coating technique, in perishable position built-up welding laser cladding layer, welding efficiency is high, and face of weld is high-quality, improves anti-corrosion, anti-sulphur, abrasive resistance and the processing efficiency of preventer.
Description
Technical field
The utility model belongs to oil equipment technical field, is related to preventer, and in particular to will with well liquid contact site into
The preventer of row Laser Cladding Treatment.
Background technique
As most important well-control equipment, preventer mainly has two kinds of forms of ram preventer and annular preventer.Flashboard
Preventer is mainly made of shell, side door, flashboard, flashboard axis, steel ring etc., and in housing cavity, side door setting exists flashboard steel ring
Shell two sides, flashboard axis are connected on flashboard, and well head is closed or opened for pushing ram movement.In drilling process, shell
Intracoelomic cavity, latus rectum, shell and side door contact surface and contact surface on the steel ring slot, flashboard, flashboard axis and the piston shaft that open up can be with
Well liquid, corrosive media, high pressure draught, the hydraulic oil of the H2S containing high concentration etc. contact, and cause to corrode and wear, or even can crack,
There is major accident in brittle failure.Annular preventer mainly includes shell, the top cover on shell and is arranged in shell and top cover inner cavity
Piston, glue core and steel ring.In drilling process, the inner cavity of shell, latus rectum, steel ring slot, the Internal Spherical Surface of top cover, steel ring slot and
Piston face is all perishable position.
Currently, the preservative treatment for these positions, the means mainly used are hardfacing alloy layer or anticorrosion with painting
Layer.It is poor to spray associativity.Built-up welding processing needs more welding beads to dock since workpiece welding capacity is larger, the low efficiency of manual welding, weldering
Layer is of poor quality.Gas shielded arc welding efficiency is slightly higher compared with manual welding, but layer quality is also poor.Although heated filament argon arc welding layer quality compared with
It is good, but welding efficiency is still lower, and equipment cost is high.In addition, hardness and anti-sulphur ability need mutually for preventer
Coordinate, hardness is higher, and brittleness and iron content are also corresponding higher, and sulfur resistive anti-corrosion ability is accordingly lower, in high concentration H2S corrosion
Under the impact of property medium and high pressure draught, once there is hot spot, these key components and parts can crack quickly, brittle failure.Fe content
A major criterion of overlay cladding corrosion resistance, thus the heap of anti-corrosion layer is welded in API16A standard clearly stipulate that
When finished size, the content of Fe is less than 5% in built-up welding composition of layer.The Fe content of built-up welding wlding itself does not have substantially, but base material is
When Fe base, wlding and base material fuse, base material composition can be transitioned into overlay cladding, general welding method, it is difficult to ensure that the content of Fe.
On the one hand each enterprise is the dilution rate of control welding, is on the one hand in heap to control the iron-content and finish of alloy solder layer
When weldering using one layer of built-up welding, a part for machining away this layer, again one layer of built-up welding, reprocessing fall this layer of a part of processing mode,
Until layer reaches the thickness and finish of needs, the treatment process is bothersome, laborious, and material and processing cost are high, and waste is serious.
Laser melting coating is a kind of new process for treating surface, is under laser beam effect that alloy powder is fast with matrix surface
Speed, which heats, simultaneously to melt, and light beam removes rear self-excitation and is cooled into that dilution rate is extremely low, is in the surface covering of metallurgical bonding with basis material,
To significantly improve a kind of surface reinforcing method of wear-resisting, anti-corrosion, heat-resisting, anti-oxidant and electrical characteristic of matrix surface etc..
Summary of the invention
The utility model is in order to improve anti-corrosion, anti-sulphur, abrasive resistance and the processing efficiency of preventer, using laser melting coating skill
Art, in the perishable position built-up welding laser cladding layer of preventer, welding efficiency is high, and face of weld is high-quality.
The technical solution that the utility model uses in order to achieve the above-mentioned object of the invention are as follows: a kind of anti-with laser cladding layer
Spray apparatus, including shell, shell is interior to be circumferentially positioned at outside shell latus rectum with the latus rectum and inner cavity, inner cavity that pass through for well liquid or casing
Enclose or mutually pass through with latus rectum, key is: the inner cavity and latus rectum surface of the shell are welded with laser by laser melting and coating process heap and melt
Coating.
As the main component of preventer, the difficulty of processing and higher cost of shell, cracking, brittle failure risk compared with
Greatly, so its anti-corrosive properties is even more important.The inner cavity and latus rectum surface of shell are in entire preventer most vulnerable to well liquid and high pressure gas
The position of stream impact, corrosion, the utility model apply laser melting and coating technique in the built-up welding anti-corrosion of preventer, the laser of formation
Cladding layer is merged with soldered surface, and welding quality is good, and anti-corrosion, sulfur resistance are superior.
Further, the preventer is ram preventer, and shell two sides are connected with side door, in the inner cavity mutually passed through with latus rectum
It is provided with flashboard, the flashboard axis being connected on flashboard is arranged in the matching through-hole on side door；The contact surface of shell and side door, shell
The steel ring slot inner surface that accessory is embedded on body and side door is welded with laser cladding layer by laser melting and coating process heap.
Further, the flashboard, flashboard axis outer surface laser cladding layer is welded with by laser melting and coating process heap.
In ram preventer, drive piston shaft and flashboard axis that flashboard is driven to move closing to latus rectum manually or from hydraulic system
Or semiclosed latus rectum or it is return back to the open latus rectum in inner cavity from latus rectum, it holds casing blowout prevention or shut-in well tightly to realize or opens well head.?
In drilling process, housing cavity, latus rectum, shell and side door contact surface and contact surface on the steel ring slot, flashboard, the flashboard axis that open up
It can contact, cause to corrode and wear with well liquid, corrosive media, high pressure draught, the hydraulic oil of the H2S containing high concentration etc., be swashed
Light cladding processing, can be improved reliability and the service life of these parts.
Further, the preventer is annular preventer, and upper part of the housing is connected with top cover, and inner cavity is circumferentially positioned at shell
Latus rectum periphery, and it is embedded with piston, glue core engaged therewith is provided in the top cover inner cavity of upper piston area；The inner surface of top cover is logical
It crosses laser melting and coating process heap and is welded with laser cladding layer.
Further, the steel ring slot inner surface of accessory is embedded on the inner and outer surfaces of the piston, shell and top cover by swashing
Light melting and coating process heap is welded with laser cladding layer.
In annular preventer, hydraulic system pushes piston to move up rapidly, and glue core is limited by top cover and cannot be moved up, in piston
It is forced to latus rectum under the action of inner conical surface and is squeezed and is tightened, holds casing blowout prevention or shut-in well tightly to realize.When opening well head, hydraulic system
Piston is pushed to move down, piston inner conical surface disappears to the extruding force of glue core, and glue core is upheld outward by the elasticity of rubber itself, restores former
Shape, well head are opened.In drilling process, the inner cavity of shell, latus rectum, steel ring slot, inner surface, steel ring slot and the piston table of top cover
Face is all perishable position, carries out Laser Cladding Treatment, reliability and the service life of these parts can be improved.
Further, the latus rectum of the ducts connector of the preventer and steel ring rooved face, flange steel ring slot surface
Laser cladding layer is welded with by laser melting and coating process heap.The connection of the ducts such as threeway, the four-way of steel ring is provided on preventer
The service life of part and flange is also to consider the important indicator of preventer durability, is carried out to the perishable position of these parts
Laser Cladding Treatment forms laser cladding layer, is also remarkably improved its reliability and service life.
Further, the thickness of the laser cladding layer is more than or equal to 0.1mm and is less than or equal to 5mm.Laser cladding layer thickness
Increase can be improved its anti-extrusion ability and intensity, but the raising of thickness and hardness can greatly increase it is cracked several
Rate, thickness is too small and can not play antisepsis.Therefore thickness cannot be excessive or too small.
Further, the thickness of the laser cladding layer is more than or equal to 0.5mm and is less than or equal to 1.45mm.The weldering of laser melting coating
Surface generally need to be machined out processing since layer surface smoothness is not so good as machining surface in 2mm or so by thickness afterwards,
Retain 1mm left and right thickness layer after machining.
Further, the laser cladding layer is formed under laser melting coating effect with by cladding surface melting by welding powder, is welded
Powder is Ni625 nickel-base alloy or E316L stainless steel.Both welding powders meet NACE MR0175 and ISO 15156 to corrosion-resistant conjunction
The requirement of gold, anti-corrosion, sulfur resistance are good, and can preferably fuse with each parts surface of preventer, greatly improve preventer
Durability.
Further, the mass percent of Fe is less than or equal to 1% in the laser cladding layer.In the surface composition of heap postwelding
In detection, Fe content is less than 1%, requirement well below as defined in API standard 5%, and the anticorrosive quality of overlay cladding is obviously mentioned
It rises.
In the utility model, preventer carries out built-up welding anti-corrosion, sulfur resistive processing using laser melting and coating technique, has following excellent
Point: 1, high-efficient: the intracoelomic cavity built-up welding of the bivalve 35-70 only needs 1 week, using the weldering speed of 500mm/min, cooperates high precision 16 axis automatic
Robot arm, so that weld seam, under the premise of meeting welding quality, the hot wire TIG welding of more Austrian Fu Nisi improves efficiency
Up to 200%.2, low dilution rate: the dilution rate of laser melting coating is extremely low, better than conventional mode built-up welding effect, and overlay cladding is only
It still can guarantee built-up welding composition of layer when 1mm.In the surface composition detection of heap postwelding, the mass percent of Fe is much low less than 1%
5% requirement, the anticorrosive quality of overlay cladding as defined in the API standard are obviously improved.3, heat affecting is small: hot when due to cladding
In quantity set, layer thickness is small, and matrix temperature rise is small, and workpiece is not easy to be influenced by heat and deformation occurs, and postwelding destressing processing is easy control
System, matrix hardness, performance are basically unchanged after cladding.4, quality is high: the pressure road of manual build up welding is wider, and the peak value of welding bead is high when welding
Degree and height of valley difference are big, weld the layer of same thickness, the wlding machined away is more, and the pressure road of laser melting coating is relatively narrow and flat
Face property is preferable, and built-up welding rear surface is smooth, and processing capacity is small, and layer built-up welding is uniform, and dense structure is less prone to stomata, crackle etc.
Normal welding defect, and can realize that memory track repeats to weld, so that workpiece, during volume production, quality is stablized.5, blowout prevention
The face of weld of device is complex-shaped, the preventer handled using laser melting and coating technique, and layer welding defect is few.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of preventer in embodiment one；
Fig. 2 is the structural schematic diagram on the surface that shell carries out Laser Cladding Treatment in embodiment one；
Fig. 3 is the structural schematic diagram on the surface that side door carries out Laser Cladding Treatment in embodiment one；
Fig. 4 is the structural schematic diagram of preventer in embodiment two；
Fig. 5 is the structural schematic diagram on the surface that shell carries out Laser Cladding Treatment in embodiment two；
Fig. 6 is the structural schematic diagram on the surface that top cover carries out Laser Cladding Treatment in embodiment two；
Fig. 7 is the structural schematic diagram on the surface that piston carries out Laser Cladding Treatment in embodiment two；
In attached drawing, 1 represents shell, and 11 represent latus rectum, and 12 represent inner cavity, and 13 represent the contact surface of shell and side door, 14 generations
The steel ring slot of watch shell, 2 represent flashboard, and 21 represent flashboard axis, and 22 represent piston shaft, and 3 represent side door, and 31 represent jump-ring slot, and 32
Skeleton grooves are represented, 33 represent the contact surface of side door and shell, and 4 represent top cover, and 41 represent the inner surface of top cover, and 42 represent top cover
Steel ring slot, 5 represent piston, and 51 represent the inner and outer surfaces of piston.
Specific embodiment
The utility model is further described below with reference to embodiment and attached drawing.
Embodiment one, a kind of ram preventer with laser cladding layer, ram preventer by shell flashboard chamber number
Single disc, double-gate template can be divided into, which is the double flange ram preventers of mono-hull, including shell 1, tool in shell 1
There are the latus rectum 11 passed through for well liquid or casing and inner cavity 12.Inner cavity 12 is passed through with 11 phase of latus rectum, is internally provided with flashboard 2.1 liang of shell
Side is connected with side door 3, and the flashboard axis 21 being connected on flashboard 2 and the piston shaft 22 connecting with flashboard axis 21 are arranged on side door 3
Matching through-hole in.Steel ring slot 14 is provided on 1 upper and lower end of shell and mating flange, steel ring slot is used to install ring gasket,
It is erodible.The sealing framework of jump-ring slot 31 and installation for sealing inner cavity 12 is provided on the contact surface of side door 3 and shell 1
Skeleton grooves 32.It include: inner cavity 12, shell and the side door of shell 1 by the surface that laser melting and coating process heap is welded with laser cladding layer
Contact surface 13, latus rectum 11 and shell steel ring slot 14；Contact of the jump-ring slot 31, skeleton grooves 32 and side door of side door 3 with shell
Face 33；The outer surface of flashboard 2；The outer surface of flashboard axis 21.
Embodiment two, a kind of annular preventer with laser cladding layer, including shell 1, have in shell 1 for well liquid or
The latus rectum 11 and inner cavity 12 that casing passes through.1 top of shell is connected with top cover 4, and inner cavity 12 is circumferentially positioned at outside 1 latus rectum 11 of shell
It encloses, and is embedded with piston 5, be provided with glue core engaged therewith in 4 inner cavity of top cover on 5 top of piston.Shell 1, top cover 4 and mating
Steel ring slot is provided on flange.By the surface that laser melting and coating process heap is welded with laser cladding layer include: shell 1 inner cavity 12,
Latus rectum 11 and steel ring slot 14；The inner surface 41 of top cover and the steel ring slot 42 of top cover；The inner and outer surfaces 51 of piston.
The latus rectum of the ducts connector of preventer and steel ring rooved face, flange steel ring in embodiment one and embodiment two
Rooved face is welded with laser cladding layer also by laser melting and coating process heap, remaining has the small part of requirement for anticorrosion that can also carry out laser
Cladding processing.Laser cladding layer is formed under laser melting coating effect with by cladding surface melting by welding powder, and welding powder can be according to need
The material of facing surface and requirement for anticorrosion are selected, preferential to select Ni625 nickel-base alloy or E316L stainless steel.Laser melting coating
Postwelding thickness surface need to generally be machined in 2mm or so since layer surface smoothness is not as good as machining surface, retain
1mm left and right thickness layer.The mass percent of Fe is less than or equal to 1% in laser cladding layer after processing.
Claims (9)
- Have 1. a kind of preventer with laser cladding layer, including shell (1), in shell (1) and to pass through for well liquid or casing Latus rectum (11) and inner cavity (12), inner cavity (12) are circumferentially positioned at shell (1) latus rectum (11) periphery or mutually pass through with latus rectum (11), special Sign is: the inner cavity (12) and latus rectum (11) surface of the shell (1) are welded with laser cladding layer by laser melting and coating process heap.
- 2. the preventer according to claim 1 with laser cladding layer, it is characterised in that: the preventer is anti-for flashboard Spray apparatus, shell (1) two sides are connected with side door (3), are provided with flashboard (2) in the inner cavity (12) mutually passed through with latus rectum (11), are connected to The matching through-hole that flashboard axis (21) on flashboard (2) and the piston shaft (22) connecting with flashboard axis (21) are arranged on side door (3) It is interior；The steel ring slot inner surface that accessory is embedded on shell (1) and the contact surface of side door (3), shell (1) and side door (3) passes through laser Melting and coating process heap is welded with laser cladding layer.
- 3. the preventer according to claim 2 with laser cladding layer, it is characterised in that: the flashboard (2), flashboard axis (21) and the outer surface of piston shaft (22) is welded with laser cladding layer by laser melting and coating process heap.
- 4. the preventer according to claim 1 with laser cladding layer, it is characterised in that: the preventer is that annular is anti- Spray apparatus, shell (1) top are connected with top cover (4), and inner cavity (12) are circumferentially positioned at shell (1) latus rectum (11) periphery, and are embedded with Piston (5) is provided with glue core engaged therewith in top cover (4) inner cavity on piston (5) top；The inner surface of top cover (4) is by swashing Light melting and coating process heap is welded with laser cladding layer.
- 5. the preventer according to claim 4 with laser cladding layer, it is characterised in that: the piston (5) it is inside and outside The steel ring slot inner surface that accessory is embedded on surface, shell (1) and top cover (4) is welded with laser melting coating by laser melting and coating process heap Layer.
- 6. the preventer according to claim 1 with laser cladding layer, it is characterised in that: the preventer matches casing The latus rectum and steel ring rooved face of pipe connecting, flange steel ring slot surface are welded with laser cladding layer by laser melting and coating process heap.
- 7. the preventer according to claim 1-6 with laser cladding layer, it is characterised in that: the laser is molten The thickness of coating is more than or equal to 0.1mm and is less than or equal to 5mm.
- 8. the preventer according to claim 7 with laser cladding layer, it is characterised in that: the thickness of the laser cladding layer Degree is more than or equal to 0.5mm and is less than or equal to 1.45mm.
- 9. the preventer according to claim 7 with laser cladding layer, it is characterised in that: the laser cladding layer is by welding Powder is formed under laser melting coating effect with by cladding surface melting, and welding powder is Ni625 nickel-base alloy or E316L stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821184565.XU CN208685054U (en) | 2018-07-25 | 2018-07-25 | A kind of preventer with laser cladding layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821184565.XU CN208685054U (en) | 2018-07-25 | 2018-07-25 | A kind of preventer with laser cladding layer |
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| Publication Number | Publication Date |
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| CN208685054U true CN208685054U (en) | 2019-04-02 |
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| CN201821184565.XU Active CN208685054U (en) | 2018-07-25 | 2018-07-25 | A kind of preventer with laser cladding layer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117404041A (en) * | 2023-12-14 | 2024-01-16 | 中国石油集团渤海钻探工程有限公司 | Injection and production wellhead device |
-
2018
- 2018-07-25 CN CN201821184565.XU patent/CN208685054U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117404041A (en) * | 2023-12-14 | 2024-01-16 | 中国石油集团渤海钻探工程有限公司 | Injection and production wellhead device |
| CN117404041B (en) * | 2023-12-14 | 2024-02-23 | 中国石油集团渤海钻探工程有限公司 | Injection and production wellhead device |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A spray preventer with laser cladding layer Effective date of registration: 20231228 Granted publication date: 20190402 Pledgee: Hebei Lincheng Rural Commercial Bank Co.,Ltd. Pledgor: HEBEI BOLU TIANBAO PETROLEUM EQUIPMENT MANUFACTURING CO.,LTD. Registration number: Y2023980075477 |