CN115890153A - Manufacturing process of anticorrosive steel pipe - Google Patents
Manufacturing process of anticorrosive steel pipe Download PDFInfo
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- CN115890153A CN115890153A CN202211537150.7A CN202211537150A CN115890153A CN 115890153 A CN115890153 A CN 115890153A CN 202211537150 A CN202211537150 A CN 202211537150A CN 115890153 A CN115890153 A CN 115890153A
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- steel pipe
- shot blasting
- flange
- rust removal
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 86
- 239000010959 steel Substances 0.000 title claims abstract description 86
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 238000005422 blasting Methods 0.000 claims abstract description 115
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 64
- 238000000034 method Methods 0.000 claims abstract description 25
- 230000008569 process Effects 0.000 claims abstract description 17
- 238000003466 welding Methods 0.000 claims abstract description 16
- 238000012856 packing Methods 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 17
- 239000011248 coating agent Substances 0.000 abstract description 14
- 238000000576 coating method Methods 0.000 abstract description 14
- 230000007797 corrosion Effects 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 2
- 238000005536 corrosion prevention Methods 0.000 abstract 2
- 238000004140 cleaning Methods 0.000 description 14
- 239000000428 dust Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000005488 sandblasting Methods 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000006187 pill Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Application Of Or Painting With Fluid Materials (AREA)
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Abstract
The invention relates to the technical field of steel pipe anticorrosion treatment, in particular to a manufacturing process of an anticorrosion steel pipe. Compared with a common linear steel pipe, the anti-corrosion flange steel pipe made of the flange steel pipe product is easier to lose corrosion resistance in practical application, namely the flange steel pipe coated with the anti-corrosion coating still has a large-area corrosion phenomenon in a short time. The invention discovers the root cause of the rust removal, starts from the rust removal stage, utilizes the new processes of steel pipe rust removal, flange welding, pipe end rust removal and corrosion prevention treatment, obviously prolongs the corrosion prevention service life of the steel pipe, and also unexpectedly obtains the technical effects of improving the overall rust removal efficiency, saving energy, time, occupied land and consumed material by shot blasting.
Description
Technical Field
The invention relates to the technical field of steel pipe anticorrosion treatment, in particular to a manufacturing process of an anticorrosion steel pipe.
Background
The anticorrosion steel pipe is widely applied in various industries, and a common preparation process is to coat an anticorrosion coating on the surface of the steel pipe.
The flange connection is the most common steel pipe connection mode, and the steel pipe with the flange welded at the pipe end is called as a flange steel pipe, and is a common anticorrosive steel pipe product. Compared with a common linear steel pipe, the anti-corrosion flange steel pipe made of the flange steel pipe product is more prone to corrosion failure in practical application, namely the flange steel pipe coated with the anti-corrosion coating still has a large-area corrosion phenomenon in a short time. The general flange steel pipe that appears anticorrosive inefficacy all appears corroding in a large scale in the pipe end, will seriously influence joint strength, greatly reduced flange steel pipe's life.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the manufacturing process overcomes the defects of the prior art, can effectively prolong the service life of the flange steel pipe, and avoids corrosion of the pipe end.
The technical scheme adopted by the invention for solving the technical problems is as follows: the manufacturing process of the anticorrosive steel pipe is characterized by comprising the following steps of: the method sequentially comprises the following steps: derusting the steel pipe, welding the flange, derusting the pipe end and performing anticorrosive treatment.
In the prior art, a manufacturing process of an anticorrosive steel pipe comprises the steps of welding a flange on the steel pipe, then performing inside and outside derusting through shot blasting and sand blasting in sequence, and then performing anticorrosive coating treatment, wherein the flange steel pipe adopts the same derusting mode as a common bare pipe in derusting, namely, in a semi-closed or fully-closed derusting machine, a plurality of throwing heads perform shot blasting derusting on the flange steel pipe to realize integral derusting, but the universal derusting mode cannot well perform targeted treatment on the welding position of the flange and the steel pipe, and experiments show that the dead angle position of the welding position of the flange and the steel pipe is easy to rust, so that the anticorrosive coating cannot be well combined with the steel pipe in subsequent anticorrosive coating treatment of the welding position, an anticorrosive short plate is generated, and a large-area pipe end is corroded under the chemical reaction conditions of heat and oxygen. Because the exposed part is the corrosion center and is difficult to be found due to the characteristics of the dead angle.
On the basis, the invention is improved in the manufacturing stage of the flange steel pipe, the whole naked pipe is subjected to rust removal firstly, then the flange is welded, then the targeted pipe end is subjected to rust removal, and finally the anticorrosion treatment is performed.
Through changing the process flow, the pertinence rust cleaning, the pipe end rust cleaning short plate has been eliminated to improved the rust cleaning effect, anticorrosive rapid inefficacy has thoroughly been avoided, simultaneously, benefit from the process improvement, steel pipe rust cleaning stage both ends do not have the flange arch, consequently can adopt ordinary, through type shot-blasting machine or other miniature grinding device that take up an area of for a short time, compare in the shot-blasting machine that must wholly put into among the prior art, area has greatly reduced, it can effectual simplification flow not need whole the shifting to large-scale rust cleaning machine of steel pipe, the separation of steel pipe rust cleaning and pipe end rust cleaning also can show the rust cleaning speed that promotes the body, improve whole rust cleaning efficiency, energy saving, time and shot-blasting consumptive material.
Preferably, the steel pipe rust removal adopts outer throwing pill rust removal.
Further preferably, the steel pipe derusting adopts a through type external shot blasting machine.
The through shot blasting machine is small in occupied area, high in rust removal efficiency, good in effect, low in cost, easy to move and transfer, free of the need of putting a steel pipe into the whole, capable of reducing product transfer and capable of improving production efficiency and product quality.
Preferably, the pipe end rust removal adopts shot blasting machines, at least one shot blasting machine is arranged above one side, close to the steel pipe, of the flange, and the shot blasting direction of the shot blasting machine faces to the joint of the flange and the steel pipe.
Thanks to the new process route, a special shot blasting rust removal device can be arranged aiming at the pipe end, so that the shot blasting direction of the special shot blasting rust removal device is more aiming at the welding joint of the flange and the steel pipe, and the rust removal efficiency and effect of the pipe end are further improved.
Further preferably, the shot blasting direction of the shot blasting machine forms an included angle with the plane of the flange.
Further preferably, the included angle between the flange plane and the included angle is 20-65 degrees.
Further preferably, the included angle is 40 degrees with respect to the plane of the flange.
Under the optimal included angle, the effect and the efficiency of rust removal can be ensured to reach the optimal value, and the oversize included angle or the undersize included angle can cause the poor rust removal effect of the flange surface or the steel pipe surface or require longer shot blasting time. Too big contained angle can make and throw the ball after striking from the flange face bounce-back and can not pass through the welding department, and the contained angle of undersize can make the ball of throwing can't effectively strike the friction flange side and descend the rust cleaning effect to the flange.
Preferably, the pipe end rust removal adopts shot blasting machines, and at least one shot blasting machine is arranged above one side, far away from the steel pipe, of the flange.
Preferably, the shot blasting direction of the shot blasting machine forms an included angle of 30 to 90 degrees with the plane of the flange.
The excessively small included angle cannot ensure that the rust removing medium forcefully impacts the flange surface to cause poor rust removing efficiency.
Preferably, the pipe end rust removal adopts a pipe end rust remover, and the pipe end rust remover comprises: a shot supply system, a shot blasting machine, a shot blasting chamber and a packing auger; the shot supply system is connected with a shot blasting machine, the shot blasting machine is arranged above the shot blasting chamber, and the bottom of the shot blasting chamber is provided with an auger which is connected with the shot blasting chamber and the shot supply system; one side of the shot blasting chamber is provided with an opening and closing door.
Shot blasting media after rust removal of the pipe by the shot blasting machine are concentrated at the bottom of the shot blasting chamber and are sent back to the shot supply system by the auger, so that the shot blasting media can be recycled; in addition, the shot blasting chamber is provided with an opening and closing door to realize the entrance and exit of the flange pipe end and the sealing of the shot blasting chamber, so that the pipe end can enter and exit conveniently and shot blasting dust can be avoided.
Compared with the prior art, the invention has the beneficial effects that: the rust removal effect is improved, the short rust removal plates at the pipe end are eliminated, and the corrosion resistance is obviously improved; meanwhile, the whole process greatly reduces the occupied area, and the flow can be effectively simplified without integrally transferring the steel pipe to a large-scale deruster; the separation of the steel pipe rust removal and the pipe end rust removal can also obviously improve the rust removal speed of the pipe body, improve the integral rust removal efficiency, and save energy, time and shot blasting consumables.
Drawings
FIG. 1 is a flow chart of a manufacturing process of an anti-corrosion steel pipe according to an embodiment.
FIG. 2 is a schematic structural diagram of a pipe end derusting machine.
The method comprises the following steps of 1, a first shot blasting machine; 2. a pill delivery system; 3. a second shot blasting machine; 4. opening and closing the door; 5. a pipe transporting vehicle; 6. a flange steel pipe; 7. a shot blasting chamber; 8. a packing auger; 9. a dust removal system; 10. a base; 11. a motion system.
Detailed Description
The present invention will be further described with reference to examples, and example 1 is a preferred example of the present invention.
Example 1
A process for manufacturing an anticorrosive steel pipe, which comprises the following steps of: the method sequentially comprises the following steps: sizing a steel pipe, chamfering a pipe end, performing external shot blasting, welding a flange, removing rust on the pipe end, performing internal sand blasting and coating an anticorrosive coating.
The outer shot blasting is to perform shot blasting rust removal on the outer surface of the bare pipe by adopting a through type outer shot blasting machine, the bare pipe is driven by a pipe transporting vehicle 5, and rust removal is performed on the surface of the steel pipe through the outer shot blasting machine. The total rust removal time is 1min.
The flange welding is to weld the flange to the end of the derusted bare pipe; the pipe end rust removal is implemented by sending the end part of the flange steel pipe 6 welded with the flange into a pipe end rust removal machine through a pipe transport vehicle 5. The rust removal time of the pipe end is 1min.
Referring to FIG. 2: the pipe end deruster includes: the shot blasting machine comprises a first shot blasting machine 1, a shot supply system 2, a second shot blasting machine 3, a shot blasting chamber 7, a dust removal system 9, a base 10, a motion system 11 and a packing auger 8; the lower part of the shot supply system 2 is connected with a first shot blasting machine 1 and a second shot blasting machine 3, the first shot blasting machine 1 and the second shot blasting machine 3 are arranged above a shot blasting chamber 7, the bottom of the shot blasting chamber 7 is provided with an auger 8, and the auger 8 is connected with the shot blasting chamber 7 and the shot supply system 2; an opening and closing door 4 is arranged on one side of the shot blasting chamber 7, the opening and closing door 4 is opened to facilitate the entrance of a pipe end, and the dust emission pollution to the environment in the shot blasting process is avoided when the opening and closing door 4 is closed; a dust removal system 9 is arranged on one side of the shot blasting chamber 7, and the dust removal system 9 performs air circulation dust removal on dust in the shot blasting chamber 7; the shot blasting chamber 7 is arranged above the base 10, the movement system 11 is arranged below the base 10, the movement system 11 is matched with the base 10 to realize the movement of the pipe end deruster along the movement system 11, and for fixed steel pipes, the mode of moving the pipe end deruster can be adopted to enable the pipe ends of the flange steel pipes 6 to enter the shot blasting chamber 7.
The shot blasting direction of the first shot blasting machine 1 faces the flange plane, and an included angle of 40 degrees is formed between the shot blasting direction of the first shot blasting machine 1 and the flange plane; the shot blasting direction of the second shot blasting machine 3 faces the welding position of the flange and the steel pipe, and the shot blasting direction of the second shot blasting machine 3 forms an included angle of 30 degrees with the plane of the flange. Two contained angles are different because first shot-blasting machine 1 mainly acts on the rust cleaning of throwing the ball to the whole side of flange, only need throw the ball face as far as possible with the flange contact surface biggest, obtain the biggest rust cleaning speed can, nevertheless second shot-blasting machine 3 still need compromise and carry out effectual, thorough rust cleaning to the welding department of flange and steel pipe, 30 less contained angle can let behind a large amount of ball impact flange faces of throwing, along flange face striking welding department, too big contained angle can make ball impact back from the flange face and can not pass through the welding department after the impact, the contained angle of undersize can make the ball can't effectively strike friction flange side and descend the rust cleaning effect to the flange.
And the inner sand blasting adopts an inner sand blasting machine to blast sand and remove rust on the inner wall of the flange steel pipe 6. The coated anticorrosive coating is an epoxy resin anticorrosive coating.
Example 2
On the basis of embodiment 1, an included angle between the shot blasting direction of a first shot blasting machine 1 and a flange plane is set to be 30 degrees, and other conditions are the same as those in embodiment 1.
Example 3
On the basis of embodiment 1, an included angle between the shot blasting direction of a first shot blasting machine 1 and the plane of a flange is set to be 90 degrees (the first shot blasting machine 1 is arranged on one side of a shot blasting chamber 7 and is right opposite to a pipe end flange), and other conditions are the same as those in embodiment 1.
Example 4
On the basis of embodiment 1, an included angle between the shot blasting direction of a second shot blasting machine 3 and a flange plane is set to be 65 degrees, and other conditions are the same as those in embodiment 1.
Example 5
On the basis of the manufacturing process of the anticorrosive steel pipe, on the basis of the embodiment 1, the included angle between the shot blasting direction of a second shot blasting machine 3 and the plane of a flange is set to be 20 degrees, and other conditions are the same as those of the embodiment 1.
Example 6
On the basis of embodiment 1, only a first shot blasting machine 1 is arranged, a second shot blasting machine 3 is not arranged, a shot blasting outlet of the first shot blasting machine 1 is located right above a pipe end flange, the shot blasting direction is coincident with the plane of the flange, and other conditions are the same as those of embodiment 1.
Comparative example 1
The manufacturing process of the anticorrosive steel pipe sequentially comprises the following steps of: sizing a steel pipe, chamfering a pipe end, welding a flange, externally polishing a ball, internally blasting sand and coating an anticorrosive coating. The outer shot blasting method comprises the following steps of blasting rust on the outer shot by using a semi-closed integral shot blasting method, fixing a plurality of throwing heads at the top of the outer shot blasting method in a closed space with the length corresponding to that of a flange steel pipe, and performing shot blasting rust removal on the outer shot blasting method to obtain a rust-removed steel pipe, wherein the plurality of throwing heads correspond to different parts of the flange steel pipe respectively.
In order to reduce the process use, the inner sand blasting is adopted to blast sand and remove rust on the inner wall of the pipe while the outer shot blasting is carried out. The whole derusting process takes 5.5min.
Comparative example 2
A process for manufacturing an anticorrosive steel pipe is characterized in that on the basis of a comparative example 1, a derusting process is set to be 3min, and other conditions are the same as those of the comparative example 1.
Performance testing
The corrosion-resistant flanged steel pipes obtained in the above examples and comparative examples were subjected to adhesion measurement of the corrosion-resistant coating with reference to standard CJT 120-2016 (best grade 1 and worst grade 5) with reference to appendix B. Wherein, the pipe end flange of flange steel pipe: one side of the end surface is a surface A, and the side close to the steel pipe is a surface B.
And (3) placing the anticorrosive flange steel pipes in the same environment with the humidity of 45-60%, and recording the corrosion time of the pipe ends.
The results of the performance testing are shown in table 1 below.
Table 1 results of performance testing
According to the performance test result, the comparative example 1 is the preparation method of the anti-corrosion flange steel pipe in the prior art, although the preparation method can meet the delivery requirement, the anti-corrosion time is obviously reduced, and the total rust removal time is far longer than that of the invention. In comparative example 2, the time taken for rust removal was shortened to be close to that of the example, resulting in a significant decrease in the adhesion of the coating and poor corrosion resistance of the pipe end.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention will still fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. A manufacturing process of an anticorrosive steel pipe is characterized in that: the method sequentially comprises the following steps: derusting the steel pipe, welding the flange, derusting the pipe end and performing anticorrosive treatment.
2. The process for manufacturing an anticorrosive steel pipe according to claim 1, characterized in that: and the steel pipe rust removal adopts the outer shot rust removal.
3. The manufacturing process of the corrosion-resistant steel pipe as claimed in claim 2, wherein the manufacturing process comprises the following steps: and the steel pipe is derusted by a through type external shot blasting machine.
4. The process for manufacturing an anticorrosive steel pipe according to claim 1, characterized in that: the pipe end rust removal adopts shot blasting machines, at least one shot blasting machine is arranged above one side, close to the steel pipe, of the flange, and the shot blasting direction of the shot blasting machine faces to the joint of the flange and the steel pipe.
5. The process for manufacturing an anticorrosive steel pipe according to claim 4, wherein: the shot blasting direction of the shot blasting machine forms an included angle with the plane of the flange.
6. The process for manufacturing an anticorrosive steel pipe according to claim 5, characterized in that: the included angle between the flange plane and the included angle is 20-65 degrees.
7. The manufacturing process of the anticorrosive steel pipe according to claim 6, characterized in that: the included angle is 40 degrees with the plane of the flange.
8. The process for manufacturing an anticorrosive steel pipe according to claim 1, characterized in that: the pipe end rust removal adopts shot blasting machines, and at least one shot blasting machine is arranged above one side of the flange, which is far away from the steel pipe.
9. The manufacturing process of the anticorrosive steel pipe according to claim 8, characterized in that: the shot blasting direction of the shot blasting machine forms an included angle of 30 to 90 degrees with the plane of the flange.
10. The process for manufacturing an anticorrosive steel pipe according to claim 1, characterized in that: the pipe end rust removal adopts a pipe end rust removal machine, and the pipe end rust removal machine comprises: a shot supply system (2), a shot blasting machine, a shot blasting chamber (7) and a packing auger (8); the shot supply system (2) is connected with a shot blasting machine, the shot blasting machine is arranged above the shot blasting chamber (7), the bottom of the shot blasting chamber (7) is provided with a packing auger (8), and the packing auger (8) is connected with the shot blasting chamber (7) and the shot supply system (2); one side of the shot blasting chamber (7) is provided with an opening and closing door (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211537150.7A CN115890153B (en) | 2022-12-02 | 2022-12-02 | Manufacturing process of anti-corrosion steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211537150.7A CN115890153B (en) | 2022-12-02 | 2022-12-02 | Manufacturing process of anti-corrosion steel pipe |
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| CN115890153A true CN115890153A (en) | 2023-04-04 |
| CN115890153B CN115890153B (en) | 2024-02-06 |
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| CN202211537150.7A Active CN115890153B (en) | 2022-12-02 | 2022-12-02 | Manufacturing process of anti-corrosion steel pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH288848A (en) * | 1949-09-12 | 1953-02-15 | Kablitz Richard | Tubular heat exchanger with finned tubes and steel tube core. |
| DE102005040735A1 (en) * | 2005-08-15 | 2007-02-22 | Walter Stucke | Anti-corrosion protection for steel parts in water, e.g. piles and parts of jetties or platforms, involves using an epoxy resin-based multilayer insulation for natural gas pipelines with an outer layer of thermoplastic material |
| CN202578753U (en) * | 2012-04-05 | 2012-12-05 | 山西伯瑞纳特科技有限公司 | Gas draining pipe for coal mining |
| RU138526U1 (en) * | 2013-07-11 | 2014-03-20 | Общество с ограниченной ответственностью "Инженерно-производственный центр" | WELDED PIPE FLANGE PROTECTED FROM INTERNAL CORROSION WITH COATING AND SURFACE FROM CORROSION-RESISTANT STEEL |
| CN205835054U (en) * | 2016-07-28 | 2016-12-28 | 山东汇浩机械科技有限公司 | The special shot-blast apparatus of large-sized flange |
| CN207584190U (en) * | 2017-12-06 | 2018-07-06 | 四川佳泰防腐绝缘材料有限公司 | One kind is registered one's residence aerial pipeline from live corrosion-resistant novel natural gas |
| CN109352198A (en) * | 2018-11-23 | 2019-02-19 | 芜湖新兴铸管有限责任公司 | A kind of welding method of pipe die |
| CN111238286A (en) * | 2018-11-29 | 2020-06-05 | 南京利德盛机械有限公司 | Anticorrosion treatment method for shell of shell-and-tube heat exchanger |
| CN215092986U (en) * | 2021-05-08 | 2021-12-10 | 山西嘉力来建筑工程有限公司 | Shot blasting rust removal device convenient to move |
-
2022
- 2022-12-02 CN CN202211537150.7A patent/CN115890153B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH288848A (en) * | 1949-09-12 | 1953-02-15 | Kablitz Richard | Tubular heat exchanger with finned tubes and steel tube core. |
| DE102005040735A1 (en) * | 2005-08-15 | 2007-02-22 | Walter Stucke | Anti-corrosion protection for steel parts in water, e.g. piles and parts of jetties or platforms, involves using an epoxy resin-based multilayer insulation for natural gas pipelines with an outer layer of thermoplastic material |
| CN202578753U (en) * | 2012-04-05 | 2012-12-05 | 山西伯瑞纳特科技有限公司 | Gas draining pipe for coal mining |
| RU138526U1 (en) * | 2013-07-11 | 2014-03-20 | Общество с ограниченной ответственностью "Инженерно-производственный центр" | WELDED PIPE FLANGE PROTECTED FROM INTERNAL CORROSION WITH COATING AND SURFACE FROM CORROSION-RESISTANT STEEL |
| CN205835054U (en) * | 2016-07-28 | 2016-12-28 | 山东汇浩机械科技有限公司 | The special shot-blast apparatus of large-sized flange |
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| CN109352198A (en) * | 2018-11-23 | 2019-02-19 | 芜湖新兴铸管有限责任公司 | A kind of welding method of pipe die |
| CN111238286A (en) * | 2018-11-29 | 2020-06-05 | 南京利德盛机械有限公司 | Anticorrosion treatment method for shell of shell-and-tube heat exchanger |
| CN215092986U (en) * | 2021-05-08 | 2021-12-10 | 山西嘉力来建筑工程有限公司 | Shot blasting rust removal device convenient to move |
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| CN115890153B (en) | 2024-02-06 |
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