CN208185639U - Heating pipeline ductile iron pipe - Google Patents
Heating pipeline ductile iron pipe Download PDFInfo
- Publication number
- CN208185639U CN208185639U CN201820575503.5U CN201820575503U CN208185639U CN 208185639 U CN208185639 U CN 208185639U CN 201820575503 U CN201820575503 U CN 201820575503U CN 208185639 U CN208185639 U CN 208185639U
- Authority
- CN
- China
- Prior art keywords
- heating pipeline
- iron pipe
- ductile iron
- spheroidal graphite
- crystallite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 71
- 238000010438 heat treatment Methods 0.000 title claims abstract description 58
- 239000011248 coating agent Substances 0.000 claims description 33
- 238000000576 coating method Methods 0.000 claims description 33
- 239000000463 material Substances 0.000 claims description 21
- 238000007789 sealing Methods 0.000 claims description 17
- 229910000635 Spelter Inorganic materials 0.000 claims description 13
- 229920001971 elastomer Polymers 0.000 claims description 12
- 239000005060 rubber Substances 0.000 claims description 12
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 8
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 8
- 229920000459 Nitrile rubber Polymers 0.000 claims description 7
- 239000004593 Epoxy Substances 0.000 claims description 5
- -1 fluorubber Polymers 0.000 claims description 5
- 229920002943 EPDM rubber Polymers 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 4
- 210000003298 dental enamel Anatomy 0.000 claims description 4
- 229920005560 fluorosilicone rubber Polymers 0.000 claims description 4
- 229920001084 poly(chloroprene) Polymers 0.000 claims description 4
- 229920002379 silicone rubber Polymers 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 4
- 229910052742 iron Inorganic materials 0.000 claims 2
- 238000010422 painting Methods 0.000 claims 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims 1
- KVNRLNFWIYMESJ-UHFFFAOYSA-N butyronitrile Chemical compound CCCC#N KVNRLNFWIYMESJ-UHFFFAOYSA-N 0.000 claims 1
- 239000011701 zinc Substances 0.000 claims 1
- 229910052725 zinc Inorganic materials 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 8
- 239000010959 steel Substances 0.000 abstract description 8
- 230000007797 corrosion Effects 0.000 abstract description 7
- 238000009434 installation Methods 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000006467 substitution reaction Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 23
- 238000010276 construction Methods 0.000 description 6
- 230000006378 damage Effects 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 239000013081 microcrystal Substances 0.000 description 5
- 239000011490 mineral wool Substances 0.000 description 5
- 238000004321 preservation Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000011253 protective coating Substances 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011494 foam glass Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000002667 nucleating agent Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229920002396 Polyurea Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000006063 cullet Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 239000002241 glass-ceramic Substances 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000006132 parent glass Substances 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920003226 polyurethane urea Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Rigid Pipes And Flexible Pipes (AREA)
- Pipe Accessories (AREA)
Abstract
The utility model discloses a kind of heating pipeline ductile iron pipe, comprising: one end is equipped with socket, the other end is equipped with the spheroidal graphite cast-iron tube body of bellmouth and the crystallite insulating layer coated on tube wall.Ductile iron pipe corrosion resistance is strong, and substitution steel pipe can be such that heating pipeline service life significantly extends, and safety significantly improves.Crystallite insulating layer hardness is high, thickness is small, and thermal and insulating performance is good, has not only facilitated pipe transport and installation, but also reduce the heat loss of heating power transmission process.
Description
Technical field
The utility model relates to a kind of heating pipeline ductile iron pipes.
Background technique
Heat supply and heating pipeline used in China city and large industrial enterprise at present are all made of and are applied with rock wool heat-preservation layer
Steel pipe is laid with, but these pipelines have the following problems:
(1) since the corrosion resistance of steel pipe is poor, especially electrocorrosion-resisting poor ability, therefore the projected life of pipeline is all
Not too long, actual life is often less than 10 years, or even 4~5 years steel pipes having just are corroded, and cause high temperature and high pressure steam
It leaks, wastes the heat supply below a large amount of raw material resources and maintenance maintenance expense, especially embedment underground or road and heating power
Pipeline, when maintenance, need to excavate road surface, seriously affect urban transportation, repair also easily high-temperature vapour is caused largely to let out not in time
Leakage causes personnel casualty accidents；
(2) the rock wool heat-preservation thickness degree that steel pipe is applied with is big, increases outer diameter, transportation cost significantly improves；Rock wool heat-preservation layer
Intensity it is very low, easily cause transport and the breakage of installation process, cause damages；
(3) steel pipe of heating pipeline needs to transport to welding, pressure testing etc., troublesome in poeration, long construction period, construction cost behind scene
With height, the burden of municipal engineering construction investment and ordinary maintenance has been aggravated；
(4) steel pipe of heating pipeline does not have the ability for resisting strong earthquakes destruction, is especially in a few years corroded, and tube wall becomes
Bao Hou, the different degrees of reduction of the strength and toughness of pipe, at this time when pipe is pounded by the stretching of external force, extruding, distortion and weight
When touching, it is easy to destroy and even be broken.
Therefore, still it is badly in need of that a kind of corrosion resistance is strong, long service life, simple installation are quick, heat insulating effect at present
Heating pipeline ductile iron pipe good and that strong earthquakes destruction can be resisted.
Utility model content
One of them of the utility model is designed to provide a kind of heating pipeline ductile iron pipe, to solve above-mentioned skill
At least one of art problem.
One aspect according to the present utility model provides a kind of heating pipeline ductile iron pipe, comprising: one end is equipped with
The spheroidal graphite cast-iron tube body and the crystallite insulating layer on spheroidal graphite cast-iron tube wall that bellmouth, the other end are equipped with socket.
The tube body of the utility model heating pipeline ductile iron pipe is using the ferrite matrix ductile cast iron of high tenacity as base
Material, corrosion resistance is strong, toughness is high, and outer wall coats crystallite insulating layer made of micro crystal material, and thermal and insulating performance is good, intensity
And hardness is high, therefore, when the ductile iron pipe substitution steel pipe of the utility model is laid with for heating pipeline, heating pipeline can be made to make
Significantly extended with the service life, safety increases substantially.Moreover, micro crystal material thermal and insulating performance is good, it is applied to conveying hot water
And steam, the heat loss in transmission process can be significantly reduced, it is energy-saving.
In some embodiments, the thickness of crystallite insulating layer can be 10~25mm.Crystallite insulating layer setting compared with
Traditional rock wool heat-preservation layer it is thin when can reach better heat insulation effect so that the coating layer thickness than rock wool heat-preservation layer thickness drop
Low 90% or so, so that it is obviously reduced the installation outer diameter of pipe, and the intensity of crystallite insulating layer, hardness are high, are hardly damaged,
Facilitate the transport and installation of pipe.
The utility model heating pipeline has bellmouth and socket with ductile iron pipe, two adjacent ductile iron pipes when connection
It is connected by bellmouth with socket between body, using flexible mechanical sealed interface, and the junction of bellmouth and socket is equipped with resistance to height
Sealing rubber ring made of adiabator.When the utility model heating pipeline is connected with ductile iron pipe, interface form can be T-type
Sealed interface, S type mechanical sealing interface, N1Type mechanical sealing interface, KIIType mechanical sealing interface or SIIType is mechanical
Sealed interface；When connection, it is not necessarily to site welding, installation is simple and efficient, and the speed of pipe installation construction is remarkably improved, and manages
The overall cost of line construction and ordinary maintenance can significantly reduce.It, can be in addition, the sealing joint of flexible socket joint connection is functional
Make heating pipeline ductile iron pipe that there is flexible and good retractility, therefore the drawing that earthquake is applied to pipe can be resisted
The external force such as stretch, squeeze, distorting, enhancing heating pipeline resists the ability of strong earthquakes destruction with ductile iron pipeline.
In some embodiments, used when the utility model heating pipeline is connected with ductile iron pipe to prepare sealant
The heat-resisting material of circle can be nitrile rubber, hydrogenated nitrile-butadiene rubber, neoprene, ethylene propylene diene rubber, silicon rubber, fluorine rubber
Glue, fluorine silicone rubber or polytetrafluoroethylene (PTFE).When heating pipeline with ductile iron pipe be applied to hot water of the delivery temperature less than 120 DEG C or
When steam, the preferred nitrile rubber of the material of sealing rubber ring, hydrogenated nitrile-butadiene rubber, neoprene or ethylene propylene diene rubber work as heating power
When pipeline ductile iron pipe is applied to hot water or steam of the delivery temperature greater than 120 DEG C, the preferred silicon rubber of the material of sealing rubber ring
Glue, fluorubber, fluorine silicone rubber or polytetrafluoroethylene (PTFE).Thus, it is possible to extend the service life of heating pipeline.
Micro crystal material described in the utility model is also known as devitrified glass or glass ceramics, and referring to will be (individual added with shape Nucleating Agent
Can be not added) specific composition parent glass, by control crystallization be made with one or more crystallite phases and residual glass phase
Composite material, there are the excellent properties such as anti-corrosion, heat-resisting, in the utility model embodiment, preferably with cullet, flyash, non-
Metallic ore etc. is primary raw material, and foaming agent, nucleating agent and additive etc., the works such as preheated, melting, foaming, crystallization, annealing are added
Porous devitrified glass made of skill, i.e. crystallite foam glass.
In some embodiments, the utility model heating pipeline ductile iron pipe can also include being set to spheroidal graphite cast-iron
Lining coating on inboard wall of tube body.Thus, it is possible to improve the corrosion resistance of heating pipeline ductile iron pipe inner wall.
In some embodiments, the coating material of above-mentioned lining coating can be epoxy ceramic or enamel, and thickness is preferred
It is 30~150 μm.The corrosion resistance of heating pipeline ductile iron pipe not only can be improved as a result, moreover it is possible to improve thermal pipe
The insulation ability of line ductile iron pipe.When heating pipeline ductile iron pipe is applied to delivery temperature less than 120 DEG C
When hot water or steam, the preferred epoxy ceramic of the coating material of lining coating, when heating pipeline ductile iron pipe is applied to conveying
When temperature is greater than 120 DEG C of hot water or steam, the preferred enamel of the coating material of lining coating.
In some embodiments, the utility model heating pipeline ductile iron pipe can also include being set to spheroidal graphite cast-iron
Spelter coating on the outer wall of tube body, and crystallite insulating layer is set on the spelter coating of spheroidal graphite cast-iron tube body, spelter coating thickness is preferably not
Less than 40 μm.Thus, it is possible to improve the corrosion resistance of heating pipeline ductile iron pipe.
In some embodiments, the utility model heating pipeline ductile iron pipe can also include external protective coating,
External protective coating can be coated on spelter coating and (i.e. crystallite insulating layer is coated on outer between spelter coating and crystallite insulating layer
On protective coating) or be coated on crystallite insulating layer and (be located at outside crystallite insulating layer).The coating material of external protective coating can be with
For asphalt caulk, bituminous epoxy paint, polyurethane or polyureas.
The utility model heating pipeline can be applied to be laid with heating pipeline with ductile iron pipe, reduce heating pipeline construction
Cost, and resist the destruction of the geological disasters such as strong earthquakes, it is ensured that life of urban resident quality and raising city quake evaluation energy
Power.
Detailed description of the invention
Fig. 1 is the structure chart of the heating pipeline ductile iron pipe of one embodiment of the utility model；
Fig. 2 is the sectional view of the spheroidal graphite cast-iron tube body of heating pipeline ductile iron pipe shown in Fig. 1；
Fig. 3 is heating pipeline ductile iron pipe S shown in Fig. 1IIThe structure chart of type mechanical sealing interface.
Specific embodiment
The embodiments of the present invention is described in detail with reference to the accompanying drawing.
Embodiment 1
Fig. 1 and Fig. 2 schematically shows that a kind of heating pipeline of embodiment according to the present utility model is cast with spheroidal graphite
Iron pipe.As shown in Figure 1, the heating pipeline ductile iron pipe includes the ball that one end is equipped with bellmouth 11, the other end is equipped with socket 12
Graphite cast iron pipe body 1 and the crystallite insulating layer 3 on 1 outer wall of spheroidal graphite cast-iron tube body.
Crystallite insulating layer 3 is made of micro crystal material coating, and in the present embodiment, the preferred crystallite foam glass of micro crystal material is micro-
The thickness of brilliant insulating layer 3 is preferably 15mm.
In the present embodiment, heating pipeline ductile iron pipe further includes lining coating 2 and spelter coating 4, wherein lining coating
2 are coated on 1 inner wall of spheroidal graphite cast-iron tube body, and for pumped (conveying) medium temperature at ≯ 120 DEG C, coating material is preferably epoxy ceramic；Conveying
At 120 DEG C of medium temperature >, coating material is preferably enamel, and coating layer thickness is 100 μm；Spelter coating 4 is set to spheroidal graphite cast-iron tube body 1
Outer wall on and between 1 outer wall of spheroidal graphite cast-iron tube body and crystallite insulating layer 3 (i.e. spelter coating 4 be coated on spheroidal graphite cast-iron tube body 1
Outer wall on, crystallite insulating layer 3 be coated on spelter coating 4 on), spelter coating 4 is with a thickness of 40 μm.
As shown in Fig. 2, in the present embodiment, the outer wall of the spheroidal graphite cast-iron tube body 1 of heating pipeline ductile iron pipe from it is inner to
It is sequentially coated with spelter coating 4 and crystallite insulating layer 3 outside, 1 inner wall of spheroidal graphite cast-iron tube body is coated with lining coating 2.
In the present embodiment, the socket of heating pipeline ductile iron pipe is not coated by lining coating 2, spigot be not coated by it is micro-
Brilliant insulating layer 3.When heating pipeline is connected with ductile iron pipe, lining coating 2 between adjacent heating pipeline ductile iron pipe
Can also be with continuous transition, after ensure that heating pipeline is connected with ductile iron pipe with crystallite insulating layer 3, entire pipe lining coating
2 and crystallite insulating layer 3 continuity.
In the present embodiment, S is preferably used when heating pipeline is connected with ductile iron pipeIIType mechanical sealing interface.Such as Fig. 3
It is shown, in the present embodiment, back stop slot 121, pipe connection are provided on 12 outer surface of socket of heating pipeline ductile iron pipe
When, socket 12 is inserted into the bellmouth 11 of heating pipeline ductile iron pipe to be connected, and socket 12 is equipped with differential 63, differential 63
It is fixedly connected by bolt 61 and nut 62 with 11 edge of bellmouth, 11 inner surface of bellmouth is equipped with embedded groove, and embedded groove is interior from embedding
Entering slot port and has been sequentially embedded sealing rubber ring 64, cage ring 65 and lock ring 66 inside, sealing rubber ring 64 is pushed down in the bottom end of differential 63,
The bottom end of lock ring 66 is pressed on back stop slot 121, sealing rubber ring 64, cage ring 65 with 66 three of lock ring closely and be located at hold
Between 11 inner walls of mouth and 12 outer wall of socket, and sealing rubber ring 64, cage ring 65 and lock ring 66 are combined and 11 inner wall of bellmouth
It is formed and is interference fitted with 12 outer wall of socket, achieve the purpose that sealing.Being used cooperatively for lock ring 66 and back stop slot 121, has interface
There is preferable anti-skid ability.
The material of sealing rubber ring 64 can be nitrile rubber, hydrogenated nitrile-butadiene rubber, neoprene, ethylene propylene diene rubber, gather
Urethane, silicon rubber, fluorubber, fluorine silicone rubber or polytetrafluoroethylene (PTFE).In the present embodiment, the material of sealing rubber ring 64 is preferably poly- four
Fluoride material.
Above-described is only some embodiments of the utility model.For those of ordinary skill in the art,
Without departing from the concept of the present invention, various modifications and improvements can be made, these belong to practical
Novel protection scope.
Claims (9)
1. heating pipeline ductile iron pipe characterized by comprising one end is equipped with bellmouth (11), the other end is equipped with socket
(12) spheroidal graphite cast-iron tube body (1) and the crystallite insulating layer (3) on spheroidal graphite cast-iron tube body (1) outer wall.
2. heating pipeline ductile iron pipe according to claim 1, which is characterized in that the crystallite insulating layer (3)
With a thickness of 10 ~ 25 mm.
3. heating pipeline ductile iron pipe according to claim 1, which is characterized in that further include being set to the spheroidal graphite to cast
Lining coating (2) on iron pipe body (1) inner wall.
4. heating pipeline ductile iron pipe according to claim 3, which is characterized in that the painting of the lining coating (2)
Covering material is epoxy ceramic or enamel.
5. according to the described in any item heating pipeline ductile iron pipes of claim 3 ~ 4, which is characterized in that the lining coating
(2) with a thickness of 30 ~ 150 μm.
6. heating pipeline ductile iron pipe according to claim 2, which is characterized in that further include being set to the spheroidal graphite to cast
Spelter coating (4) on the outer wall of iron pipe body (1), and the crystallite insulating layer (3) is set to the zinc painting of the spheroidal graphite cast-iron tube body (1)
On layer (4).
7. heating pipeline ductile iron pipe according to claim 6, which is characterized in that the thickness of the spelter coating (4)
Not less than 40 μm.
8. heating pipeline ductile iron pipe according to claim 7, which is characterized in that including multiple spheroidal graphite cast-iron
Tube body (1), by bellmouth (11) and socket (12) connection between the adjacent ductile iron pipe body (1) of every two, and bellmouth (11) and
The junction of socket (12) is equipped with sealing rubber ring made of heat-resisting material.
9. heating pipeline ductile iron pipe according to claim 8, which is characterized in that the heat-resisting material is butyronitrile
Rubber, hydrogenated nitrile-butadiene rubber, neoprene, ethylene propylene diene rubber, silicon rubber, fluorubber, fluorine silicone rubber or polytetrafluoroethylene (PTFE).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820575503.5U CN208185639U (en) | 2018-04-20 | 2018-04-20 | Heating pipeline ductile iron pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820575503.5U CN208185639U (en) | 2018-04-20 | 2018-04-20 | Heating pipeline ductile iron pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208185639U true CN208185639U (en) | 2018-12-04 |
Family
ID=64434108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820575503.5U Active CN208185639U (en) | 2018-04-20 | 2018-04-20 | Heating pipeline ductile iron pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208185639U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108331977A (en) * | 2018-04-20 | 2018-07-27 | 广东北晟益通实业有限公司 | Heating pipeline ductile iron pipe, its preparation process and application |
| WO2019201180A1 (en) * | 2018-04-20 | 2019-10-24 | 广东北晟益通实业有限公司 | Spheroidal graphite cast iron pipe for petroleum pipeline, preparation process and application thereof |
| CN111637277A (en) * | 2020-05-25 | 2020-09-08 | 辽宁爱维尔金属成型科技股份有限公司 | Internal-acting type nodular cast iron jacking pipe for whole trenchless pipeline construction |
| CN112344108A (en) * | 2020-11-27 | 2021-02-09 | 际华三五一七橡胶制品有限公司 | Nodular cast iron pipe with prefabricated heat preservation layer |
-
2018
- 2018-04-20 CN CN201820575503.5U patent/CN208185639U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108331977A (en) * | 2018-04-20 | 2018-07-27 | 广东北晟益通实业有限公司 | Heating pipeline ductile iron pipe, its preparation process and application |
| WO2019201181A1 (en) * | 2018-04-20 | 2019-10-24 | 广东北晟益通实业有限公司 | Spheroidal graphite cast iron pipe for heating pipeline, preparation process and application thereof |
| WO2019201180A1 (en) * | 2018-04-20 | 2019-10-24 | 广东北晟益通实业有限公司 | Spheroidal graphite cast iron pipe for petroleum pipeline, preparation process and application thereof |
| CN108331977B (en) * | 2018-04-20 | 2020-06-26 | 广东北晟益通实业有限公司 | Nodular cast iron pipe for thermal pipeline, preparation process and application thereof |
| CN111637277A (en) * | 2020-05-25 | 2020-09-08 | 辽宁爱维尔金属成型科技股份有限公司 | Internal-acting type nodular cast iron jacking pipe for whole trenchless pipeline construction |
| CN112344108A (en) * | 2020-11-27 | 2021-02-09 | 际华三五一七橡胶制品有限公司 | Nodular cast iron pipe with prefabricated heat preservation layer |
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Effective date of registration: 20240119 Granted publication date: 20181204 |