CN220268672U - Large-caliber seamless steel pipe for long-distance steam pipe network - Google Patents
Large-caliber seamless steel pipe for long-distance steam pipe network Download PDFInfo
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- CN220268672U CN220268672U CN202321432869.4U CN202321432869U CN220268672U CN 220268672 U CN220268672 U CN 220268672U CN 202321432869 U CN202321432869 U CN 202321432869U CN 220268672 U CN220268672 U CN 220268672U
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 102
- 239000010959 steel Substances 0.000 title claims abstract description 102
- 238000005260 corrosion Methods 0.000 claims abstract description 24
- 238000005507 spraying Methods 0.000 claims abstract description 20
- 238000009413 insulation Methods 0.000 claims abstract description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 11
- 239000003973 paint Substances 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 8
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical group [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 4
- 239000011325 microbead Substances 0.000 claims description 3
- 239000012774 insulation material Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 19
- 238000010622 cold drawing Methods 0.000 abstract description 8
- 238000005422 blasting Methods 0.000 abstract description 4
- 238000000227 grinding Methods 0.000 abstract description 4
- 238000005098 hot rolling Methods 0.000 abstract description 4
- 238000005498 polishing Methods 0.000 abstract description 4
- 239000011248 coating agent Substances 0.000 description 13
- 238000000576 coating method Methods 0.000 description 13
- 238000010438 heat treatment Methods 0.000 description 13
- 230000005855 radiation Effects 0.000 description 10
- 230000017525 heat dissipation Effects 0.000 description 9
- 238000002310 reflectometry Methods 0.000 description 9
- 238000005096 rolling process Methods 0.000 description 7
- 238000000137 annealing Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 239000011810 insulating material Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
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- 239000000463 material Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 241001478428 Syngnathus Species 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007590 electrostatic spraying Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000011863 silicon-based powder Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000219748 Cyamopsis Species 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000001192 hot extrusion Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000004005 microsphere Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
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Abstract
The utility model discloses a large-caliber seamless steel pipe for a long-distance steam pipe network, which is produced by combining hot rolling, hot expansion and cold drawing processes, carrying out two-step straightening and rounding on the pipe, carrying out shot blasting on the inner surface and the outer surface of the steel pipe, grinding and polishing, then spraying the inner surface of the steel pipe to form an anti-corrosion drag reduction layer, and spraying the outer surface to form a reflecting layer and a heat insulation layer, wherein the outer diameter of the seamless steel pipe is 559-1420 mm, the wall thickness is 8-45 mm, the diameter-wall ratio is 100, the maximum length is 14m, the outer diameter tolerance is +/-0.75%, the wall thickness tolerance is 0-15%, the straightness is less than 1.2mm/m, the out-of-roundness is less than 1.0% of the average diameter, and the roughness of the inner surface and the outer surface of the steel pipe is less than 6.3 mu m. The large-caliber seamless steel pipe for the long-distance steam pipe network has wide size range, high geometric precision and good internal and external surface quality, and can effectively reduce the temperature drop and pressure drop of the long-distance steam pipe network.
Description
Technical Field
The utility model relates to the technical field of long-distance steam pipe networks, in particular to a large-caliber seamless steel pipe for a long-distance steam pipe network.
Background
With the rapid development of cogeneration, central heating and steam supply in the fields of thermal power and nuclear power, the steam load of a long-distance steam transmission pipe network is larger and longer. Along with the continuous increase of the steam load, the large-caliber thin-wall seamless steel pipe is increasingly widely applied. The current hot continuous rolling unit can produce a seamless steel pipe with the maximum outer diameter of 508mm and the maximum diameter-wall ratio of 50. The large-caliber seamless steel pipe with the outer diameter larger than 508mm can be produced by adopting an Arseler unit, a periodical pipe mill unit, a conical roller skew mill unit, a large pipe jacking unit and a hot extrusion unit, but is limited by rolling capacity, and the diameter-wall ratio of the large-caliber seamless steel pipe produced by the units is generally not more than 25. In order to meet the requirements of large-caliber thin-wall seamless steel pipes for long-distance steam pipe networks, a hot expansion method can be adopted for production. However, how to ensure the uniformity, straightness and out-of-roundness of the wall thickness of the hot-expanded steel pipe is a difficult problem to be solved in production.
With the extension of the conveying distance of a long-distance steam conveying pipe network, the problems of temperature drop and pressure drop of steam are more and more prominent. Besides the excellent heat insulating material and improved heat insulating layer structure and construction quality, the structure and performance of the large-caliber thin-wall seamless steel pipe have great influence on the temperature drop and pressure drop of the long-distance pipeline network. Therefore, a large-caliber thin-wall seamless steel pipe capable of effectively reducing temperature drop and pressure drop of a long-distance steam pipe network is required to be manufactured.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model provides the large-caliber seamless steel pipe for the long-distance steam pipe network, which has wide size range, high geometric precision and good inner and outer surface quality and can effectively reduce the temperature drop and pressure drop of the long-distance steam pipe network.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
according to a first aspect of the utility model, a large-caliber seamless steel pipe for a long steam pipe network is provided, wherein the outer diameter of the seamless steel pipe ranges from 559 mm to 1420mm, the wall thickness of the seamless steel pipe ranges from 8mm to 45mm, the diameter-wall ratio of the seamless steel pipe to 100, the maximum length of the seamless steel pipe ranges from 14m, the outer diameter tolerance of +/-0.75%, the wall thickness tolerance of 0-15%, the straightness is less than 1.2mm/m, the out-of-roundness is less than 1.0% of the average diameter, and the inner and outer surface roughness of the steel pipe is less than 6.3 mu m.
Specifically, the inner wall of the seamless steel tube is sprayed to form an anti-corrosion drag reduction layer, the outer wall of the seamless steel tube is sprayed to form a reflecting layer, and the outer side of the reflecting layer is provided with an insulating layer.
Specifically, the thickness of the anti-corrosion drag reduction layer is 100-300 mu m, the thickness of the reflecting layer is more than or equal to 20 mu m, and the thickness of the heat preservation layer is 2-6 mm.
Specifically, the anti-corrosion drag reduction layer is formed by spraying a fluoride-containing high-temperature-resistant organic silicon powder coating or a high-temperature-resistant drag-reduction energy-saving heavy anti-corrosion coating of Shanghai sea Syngnathus new material Co. The anti-corrosion drag reduction layer can slow down the oxidation corrosion and steam erosion of the pipeline, is smooth and flat, and can effectively reduce the resistance of steam flow.
The reflecting layer is formed by spraying aluminum powder with aluminum content not lower than 99.6%, after spraying, the aluminum powder coating is polished, the reflectivity of the reflecting layer is detected according to the rule of ASTM C1371, the reflectivity is ensured to be more than 50%, and radiation heat dissipation loss during high-temperature service is reduced by improving the reflectivity of the surface of the steel pipe.
Specifically, the heat-insulating material of the heat-insulating layer is silicate composite heat-insulating paint or fiber reinforced high-temperature-resistant nano ceramic microbead paint.
The second aspect of the utility model provides a method for manufacturing the large-caliber seamless steel pipe for the long-distance steam pipe network, which comprises the following steps:
s1, performing hot rolling and straightening treatment on a blank to obtain a pierced billet, wherein the outer diameter of the pierced billet is 508-820 mm, the outer diameter deviation is +/-1%, the wall thickness deviation is 0-25%, the wall thickness unevenness is less than 20%, the straightness is less than 2mm/m, and the out-of-roundness is less than 1.5%;
s2, sequentially carrying out thermal expansion, annealing and straightening treatment on the pierced billet to obtain a capillary, wherein the thermal expansion temperature is 750-850 ℃, and the expansion ratio is less than or equal to 1.6;
s3, performing cold drawing treatment on the hollow billet to obtain a steel pipe, wherein the cold drawing speed is less than or equal to 1.0m/min, and the wall thickness reduction is less than or equal to 4.0mm;
s4, if the outer diameter of the steel pipe subjected to cold drawing does not reach the specification of a finished product, repeating the step S2 to perform second heat expansion, wherein the expansion ratio is less than or equal to 1.5 during the second heat expansion;
s5, carrying out heat treatment and straightening treatment on the steel pipe, wherein the straightness of the steel pipe is less than 1.2mm/m, and the out-of-roundness is less than 1.0%;
s6, performing shot blasting, grinding and polishing on the inner surface and the outer surface of the steel pipe, so that the roughness of the inner surface and the outer surface of the steel pipe is smaller than 6.3 mu m, thereby being beneficial to reducing the steam flow resistance and reducing the radiation loss.
Specifically, in the step S2, the annealing temperature is 740-780 ℃, and the heat preservation time is determined according to the wall thickness of the capillary. Because the large-caliber seamless steel pipe for the long-distance steam pipe network has large deformation in the heat treatment process, and the problems of increased straightness and out-of-round are outstanding, the pipe is supported by adopting the protection support die in the annealing treatment in the step S2 and the heat treatment in the step S5, the radian of the supporting surface of the protection support die is consistent with that of the outer surface of the pipe, the plurality of protection support dies are arranged in the axial direction of the pipe, and the distance between two adjacent protection support dies is less than or equal to 2.5m.
Specifically, in the step S5, in the heat treatment process, a plurality of quincuncial support frames are installed in the steel pipe, the length of each quincuncial support frame can be adjusted according to the diameter of the inner circle of the steel pipe, and in the specific application, the quincuncial support frames are uniformly distributed at the pipe ends of the steel pipe and the positions with the interval of 2-3 m so as to reduce the deformation of the steel pipe in the heat treatment process, and a backing plate is arranged at the contact part of the quincuncial support frames and the inner surface of the steel pipe.
Specifically, after the step S6, an anti-corrosion and drag-reducing layer is formed on the inner wall of the steel pipe by spraying through an electrostatic spraying process, the outer surface of the steel pipe is cleaned, then aluminum powder is sprayed on the outer surface of the steel pipe by adopting an electrostatic powder spraying process to form a reflecting layer, and finally, an insulating layer is formed by coating or spraying an insulating material on the outer surface of the steel pipe.
Specifically, in the step S1, the end face of the blank is phi 500-phi 800, and the weight of the blank is 3000-6000 kg.
Compared with the prior art, the utility model has the following beneficial effects:
(1) The seamless steel pipe processed and manufactured by the utility model has wide size range, large diameter and large diameter-wall ratio, can improve the steam load of a single pipeline, reduce the number of pipelines for a steam pipe network and save investment;
(2) The pierced billet is obtained by rolling a blank with large tonnage and large section, the length of the manufactured seamless steel pipe is long, the welding workload of a field pipeline can be reduced, the installation efficiency is improved, and the construction cost is saved;
(3) The geometric accuracy of the manufactured seamless steel tube is high, particularly the straightness and the out-of-roundness are greatly reduced, and the assembly and the installation on site are facilitated;
(4) The roughness of the inner surface and the outer surface of the prepared seamless steel pipe is low, the steam flow resistance and the radiation heat dissipation loss are reduced, and the energy saving and consumption reduction effects are obvious;
(5) The outer surface of the seamless steel pipe is sprayed with an integral reflecting layer and an integral heat-insulating layer, the reflecting layer and the heat-insulating layer are firm and reliable, the service life is long, the temperature drop of a steam pipe network can be effectively reduced, the thickness of a subsequent heat-insulating layer of the heat-insulating pipe can be reduced, and the heat-insulating pipe is convenient to store, transport, install and maintain.
Drawings
The utility model will be described in further detail with reference to the drawings and the specific embodiments.
FIG. 1 is a sectional structural view of a seamless steel pipe according to the present utility model;
wherein, the specific reference numerals are as follows: seamless steel pipe 1, anticorrosive drag reduction layer 2, reflection coating 3, heat preservation layer 4.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values.
The embodiment of the utility model provides a large-caliber seamless steel pipe for a long steam pipe network, wherein the outer diameter of the seamless steel pipe 1 is 559-1420 mm, the wall thickness is 8-45 mm, the diameter-wall ratio is 100, the maximum length is 14m, the outer diameter tolerance is +/-0.75%, the wall thickness tolerance is 0-15%, the straightness is less than 1.2mm/m, the out-of-roundness is less than 1.0% of the average diameter, and the roughness of the inner surface and the outer surface of the steel pipe is less than 6.3 mu m.
The cross-section structure of the seamless steel tube 1 is shown in fig. 1, an anti-corrosion drag reduction layer 2 is formed by spraying the inner wall of the seamless steel tube 1, a reflecting layer 3 is formed by spraying the outer wall of the seamless steel tube 1, and a heat preservation layer 4 is formed on the outer side of the reflecting layer 3.
The thickness of the anti-corrosion drag reduction layer 2 is 100-300 mu m, the thickness of the reflecting layer 3 is more than or equal to 20 mu m, and the thickness of the heat preservation layer 4 is 2-6 mm.
The anti-corrosion and drag-reducing layer 2 is formed by spraying a fluoride-containing high-temperature-resistant organosilicon powder coating or a Shanghai sea Syngnathus new material Co-Ltd high-temperature-resistant, drag-reducing and energy-saving heavy anti-corrosion coating. The anti-corrosion drag reduction layer 2 can slow down the oxidation corrosion and steam erosion of the pipeline, and the anti-corrosion drag reduction layer 2 is smooth and flat, so that the resistance of steam flow can be effectively reduced.
The reflecting layer 3 is formed by spraying aluminum powder with aluminum content not lower than 99.6%, after spraying, the aluminum powder coating is polished, the reflectivity of the reflecting layer 3 is detected according to the rule of ASTM C1371, the reflectivity is ensured to be more than 50%, and radiation heat dissipation loss during high-temperature service is reduced by improving the reflectivity of the surface of the steel pipe.
The heat insulating material of the heat insulating layer 4 is silicate composite heat insulating paint or fiber reinforced high temperature resistant nano ceramic microsphere paint, which is painted or sprayed to the outer surface of the steel pipe to form the heat insulating layer 4.
The processing and manufacturing method of the large-caliber seamless steel pipe for the long steam pipe network comprises the following steps:
s1, smelting a blank with the end face of phi 500-phi 800 by using an electric furnace external refining and vacuum refining method, wherein the weight of the blank is 3000-6000 kg, the rolling ratio of the large-specification end face is improved, and the increase of the weight of the blank is convenient for producing a steel pipe with longer length;
s2, performing hot rolling treatment on the blank by adopting a three-roller retained mandrel PQF continuous rolling unit or a conical roller oblique rolling unit, wherein the outer diameter of a pierced billet obtained after hot rolling is 508-820 mm, the outer diameter deviation is +/-1%, the wall thickness deviation is 0-25%, and the wall thickness non-uniformity is less than 20%;
s3, straightening the pierced billet to ensure that the straightness is less than 2mm/m and the out-of-roundness is less than 1.5%;
s4, removing sundries and oxide skin on the inner wall of the pierced billet by internal shot blasting or internal grinding, and then uniformly coating graphite lubricant on the inner wall of the pierced billet;
s5, performing heat expansion treatment on the pierced billet by using a pushing type expanding unit, wherein the intermediate frequency heating temperature is 750-850 ℃, and the expanding ratio is not more than 1.6;
s6, annealing the capillary tube obtained after the diameter expansion, wherein the heating temperature is 740-80 ℃, and the heat preservation time is determined according to the wall thickness of the capillary tube; the large-caliber seamless steel pipe for the long steam transmission pipe network has the advantages that the deformation is large in the heat treatment process, the straightness is increased, and the problem of out-of-round is remarkable, so that in the annealing treatment process, the hollow billet is supported on a special protection support die, the radian of the supporting surface of the protection support die is consistent with that of the outer surface of the hollow billet, the contact area of the supporting surface is conveniently increased, the weight of the hollow billet is dispersed, a plurality of protection support dies are arranged along the axial direction of the hollow billet, and the distance between two adjacent protection support dies is less than or equal to 2.5m;
s7, straightening the capillary by using a hydraulic straightener and a six-roller straightener to ensure that the straightness is less than 2mm/m and the out-of-roundness is less than 1.5%;
s8, phosphating and saponifying the capillary tube to form a layer of phosphating film and saponifying film on the inner surface and the outer surface of the capillary tube;
s9, performing cold drawing treatment on the blank pipe by using a 1600t precise cold drawing unit to obtain a steel pipe, wherein the cold drawing speed is less than or equal to 1.0m/min, and the wall thickness reduction is less than or equal to 4.0mm;
s10, if the outer diameter of the steel pipe subjected to cold drawing does not reach the specification of a finished product, repeating the steps S3-S7 to perform second hot expansion on the steel pipe, wherein the expansion ratio is less than or equal to 1.5 during the second hot expansion;
s11, carrying out heat treatment on the steel pipe, wherein the heat treatment temperature and the heat preservation time are determined according to the material of the steel pipe and the wall thickness of the steel pipe; in the heat treatment process, the steel pipe is supported on a special protection support die, the arrangement of the protection support die is the same as that of the step S6, meanwhile, a plurality of plum blossom supporting frames are installed in the steel pipe, the length of each plum blossom supporting frame can be adjusted according to the diameter of the inner circle of the steel pipe, in the specific application process, plum blossom supporting frames are uniformly distributed at the pipe ends of the steel pipe and the positions with the interval of 2-3 m so as to reduce the deformation of the steel pipe in the heat treatment process, and a backing plate is arranged at the contact part of each plum blossom supporting frame and the inner surface of the steel pipe;
s12, straightening the steel pipe by using a hydraulic straightener and a six-roller straightener to ensure that the straightness is less than 1.2mm/m and the out-of-roundness is less than 1.0%;
s13, performing shot blasting on the inner surface and the outer surface of the steel pipe, and grinding and polishing the inner surface and the outer surface of the steel pipe to ensure that the roughness of the inner surface and the outer surface of the steel pipe is less than 6.3 mu m; as known from the knowledge of fluid mechanics, the pressure drop of the steam pipe network is in direct proportion to the friction resistance coefficient lambda of the inner wall of the pipeline, the friction resistance coefficient lambda is in direct proportion to the absolute roughness K of the inner wall of the pipeline to the power of 0.25, and the absolute roughness K of the inner wall of the general hot-rolled seamless steel pipe is 200 mu m, so that the absolute roughness K is reduced to below 6.3 mu m, and the pressure drop of the steam pipeline can be obviously reduced; in addition, as the radiation emergent degree M of the steel is in direct proportion to the surface roughness K, the absolute roughness K of the inner surface and the outer surface of the steel pipe is reduced, so that radiation heat dissipation loss can be reduced, especially when the steam temperature is higher, the proportion occupied by radiation heat dissipation is increased, and the reduction of the roughness of the inner surface and the outer surface of the pipeline is very beneficial to the reduction of radiation heat dissipation loss;
s14, adopting an electrostatic spraying process to spray an anti-corrosion drag reduction layer 2 on the inner wall of the steel pipe, wherein the anti-corrosion drag reduction layer 2 is made of a fluoride-containing high-temperature-resistant organic silicon powder coating or a Shanghai sea water cyamopsis new material company high-temperature-resistant drag reduction energy-saving heavy anti-corrosion coating; the thickness of the anti-corrosion drag reduction layer 2 is 100-300 mu m; the anti-corrosion drag reduction layer 2 can slow down the oxidation corrosion and steam erosion of the pipeline, and the anti-corrosion drag reduction layer 2 is smooth and flat, so that the resistance of steam flow can be effectively reduced;
s15, subsequently, cleaning the outer surface of the steel pipe, wherein the cleaning steps are as follows: solvent degreasing or electrolytic degreasing, pure water cleaning, deionized water spraying and drying, then spraying a reflecting layer 3 on the outer surface of a steel pipe by utilizing an electrostatic powder spraying process, wherein the reflecting layer 3 is made of aluminum powder with aluminum content not less than 99.6%, the thickness of the reflecting layer 3 is not less than 20 mu m, then polishing the aluminum powder coating, detecting the reflectivity of the reflecting layer 3 according to the rule of ASTM C1371, ensuring that the reflectivity is more than 50%, and reducing radiation heat dissipation loss in high-temperature service by improving the reflectivity of the surface of the steel pipe;
s16, coating or spraying an insulating layer 4 on the outer surface of the steel pipe, wherein the insulating layer 4 is made of silicate composite heat insulation paint and fiber reinforced high-temperature resistant nano ceramic microbead paint, and the thickness of the insulating layer 4 is 2-6 mm.
The comprehensive heat dissipation loss and the surface temperature of different examples and comparative examples are measured according to the surface temperature method in GB/T28638 and GB/T17357, the specification of the working steel pipe selected in each example and comparative example is phi 820 x 20mm, the temperature of fluid in the working steel pipe is 350 ℃, and the test results are shown in the following table:
in summary, the seamless steel pipe processed and manufactured by the utility model has wide size range, large diameter and large diameter-wall ratio, can improve the steam load of a single pipeline, reduce the number of pipelines for a steam pipe network and save investment; the pierced billet is obtained by rolling a blank with large tonnage and large section, the length of the manufactured seamless steel pipe is long, the welding workload of a field pipeline can be reduced, the installation efficiency is improved, and the construction cost is saved; the geometric accuracy of the manufactured seamless steel tube is high, particularly the straightness and the out-of-roundness are greatly reduced, and the assembly and the installation on site are facilitated; the roughness of the inner surface and the outer surface of the seamless steel pipe is low, the steam flow resistance and the radiation heat dissipation loss are reduced, and the energy saving and consumption reduction effects are obvious; the outer surface of the seamless steel pipe is sprayed with an integral reflecting layer and an integral heat-insulating layer, the reflecting layer and the heat-insulating layer are firm and reliable, the service life is long, the temperature drop of a steam pipe network can be effectively reduced, the thickness of a subsequent heat-insulating layer of the heat-insulating pipe can be reduced, and the heat-insulating pipe is convenient to store, transport, install and maintain.
The foregoing description of the utility model has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the utility model pertains, based on the idea of the utility model.
Claims (5)
1. A large-caliber seamless steel pipe for a long steam pipe network is characterized in that the outer diameter of the seamless steel pipe is 559-1420 mm, the wall thickness is 8-45 mm, the diameter-wall ratio is 100, the maximum length is 14m, the outer diameter tolerance is +/-0.75%, the wall thickness tolerance is 0-15%, the straightness is less than 1.2mm/m, the out-of-roundness is less than 1.0% of the average diameter, and the roughness of the inner surface and the outer surface of the steel pipe is less than 6.3 mu m.
2. The large-caliber seamless steel pipe for the long-distance steam pipe network according to claim 1, wherein an anti-corrosion and anti-drag layer is formed by spraying the inner wall of the seamless steel pipe, a reflecting layer is formed by spraying the outer wall of the seamless steel pipe, and an insulating layer is formed outside the reflecting layer.
3. The large-caliber seamless steel pipe for the long-distance steam pipe network according to claim 2, wherein the thickness of the anti-corrosion drag reduction layer is 100-300 mu m, the thickness of the reflecting layer is more than or equal to 20 mu m, and the thickness of the heat preservation layer is 2-6 mm.
4. A large diameter seamless steel pipe for a long steam pipe network according to claim 2 or 3, wherein the reflecting layer is formed by spraying aluminum powder.
5. The large-caliber seamless steel pipe for the long-distance steam pipe network according to claim 4, wherein the heat insulation material of the heat insulation layer is silicate composite heat insulation paint or fiber reinforced high-temperature-resistant nano ceramic microbead paint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321432869.4U CN220268672U (en) | 2023-06-06 | 2023-06-06 | Large-caliber seamless steel pipe for long-distance steam pipe network |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321432869.4U CN220268672U (en) | 2023-06-06 | 2023-06-06 | Large-caliber seamless steel pipe for long-distance steam pipe network |
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| Publication Number | Publication Date |
|---|---|
| CN220268672U true CN220268672U (en) | 2023-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321432869.4U Active CN220268672U (en) | 2023-06-06 | 2023-06-06 | Large-caliber seamless steel pipe for long-distance steam pipe network |
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| Country | Link |
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| CN (1) | CN220268672U (en) |
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2023
- 2023-06-06 CN CN202321432869.4U patent/CN220268672U/en active Active
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