CN108273974A - Oil pipeline ductile iron pipe, its preparation process and application - Google Patents
Oil pipeline ductile iron pipe, its preparation process and application Download PDFInfo
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- CN108273974A CN108273974A CN201810362361.9A CN201810362361A CN108273974A CN 108273974 A CN108273974 A CN 108273974A CN 201810362361 A CN201810362361 A CN 201810362361A CN 108273974 A CN108273974 A CN 108273974A
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- Prior art keywords
- ductile iron
- iron pipe
- oil pipeline
- iron
- pipe
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Links
- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 214
- 238000002360 preparation method Methods 0.000 title claims abstract description 36
- 239000011248 coating agent Substances 0.000 claims abstract description 80
- 238000000576 coating method Methods 0.000 claims abstract description 80
- 239000000463 material Substances 0.000 claims abstract description 21
- 238000005266 casting Methods 0.000 claims abstract description 20
- 239000003208 petroleum Substances 0.000 claims abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 271
- 229910052742 iron Inorganic materials 0.000 claims description 135
- 239000003921 oil Substances 0.000 claims description 115
- 239000007788 liquid Substances 0.000 claims description 90
- 239000000203 mixture Substances 0.000 claims description 46
- 238000000137 annealing Methods 0.000 claims description 40
- 239000010410 layer Substances 0.000 claims description 37
- 238000000034 method Methods 0.000 claims description 35
- 239000000126 substance Substances 0.000 claims description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 25
- 238000012360 testing method Methods 0.000 claims description 23
- 230000008569 process Effects 0.000 claims description 20
- 238000007789 sealing Methods 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 229920001971 elastomer Polymers 0.000 claims description 18
- 239000005060 rubber Substances 0.000 claims description 18
- 229910052799 carbon Inorganic materials 0.000 claims description 17
- 229910000635 Spelter Inorganic materials 0.000 claims description 16
- 239000011777 magnesium Substances 0.000 claims description 15
- 238000009750 centrifugal casting Methods 0.000 claims description 14
- 239000007921 spray Substances 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 13
- 238000012545 processing Methods 0.000 claims description 13
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 12
- 230000007547 defect Effects 0.000 claims description 12
- 229910052725 zinc Inorganic materials 0.000 claims description 12
- 239000011701 zinc Substances 0.000 claims description 12
- 230000006378 damage Effects 0.000 claims description 9
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- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical group [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 8
- 239000011247 coating layer Substances 0.000 claims description 8
- 239000010439 graphite Substances 0.000 claims description 8
- 229910002804 graphite Inorganic materials 0.000 claims description 8
- 238000007711 solidification Methods 0.000 claims description 8
- 230000008023 solidification Effects 0.000 claims description 8
- 229910052749 magnesium Inorganic materials 0.000 claims description 7
- 238000012797 qualification Methods 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 6
- 238000011081 inoculation Methods 0.000 claims description 6
- -1 fluorubber Polymers 0.000 claims description 5
- 239000002086 nanomaterial Substances 0.000 claims description 5
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 5
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- 238000004321 preservation Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
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- 238000002474 experimental method Methods 0.000 claims description 3
- 229920005560 fluorosilicone rubber Polymers 0.000 claims description 3
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- 239000010703 silicon Substances 0.000 claims description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims 1
- 229910017435 S2 In Inorganic materials 0.000 claims 1
- 238000000605 extraction Methods 0.000 claims 1
- 229910052739 hydrogen Inorganic materials 0.000 claims 1
- 239000001257 hydrogen Substances 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 14
- 239000002893 slag Substances 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 10
- 238000010276 construction Methods 0.000 abstract description 9
- 230000007797 corrosion Effects 0.000 abstract description 9
- 238000005265 energy consumption Methods 0.000 abstract description 6
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- 229910000831 Steel Inorganic materials 0.000 description 17
- 239000010959 steel Substances 0.000 description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
- 235000016804 zinc Nutrition 0.000 description 12
- 239000011253 protective coating Substances 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000009434 installation Methods 0.000 description 8
- 230000008018 melting Effects 0.000 description 7
- 238000002844 melting Methods 0.000 description 7
- 229910001018 Cast iron Inorganic materials 0.000 description 6
- 229910001567 cementite Inorganic materials 0.000 description 6
- 230000006698 induction Effects 0.000 description 6
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 6
- 238000007689 inspection Methods 0.000 description 5
- 239000013081 microcrystal Substances 0.000 description 5
- 229910001562 pearlite Inorganic materials 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- 238000006477 desulfuration reaction Methods 0.000 description 4
- 230000023556 desulfurization Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 239000011490 mineral wool Substances 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000011494 foam glass Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
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- 239000004615 ingredient Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
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- 239000011593 sulfur Substances 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- LLPOLZWFYMWNKH-CMKMFDCUSA-N hydrocodone Chemical compound C([C@H]1[C@H](N(CC[C@@]112)C)C3)CC(=O)[C@@H]1OC1=C2C3=CC=C1OC LLPOLZWFYMWNKH-CMKMFDCUSA-N 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000005543 nano-size silicon particle Substances 0.000 description 2
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- 239000004814 polyurethane Substances 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 241001640558 Cotoneaster horizontalis Species 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 206010061245 Internal injury Diseases 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 229920002396 Polyurea Polymers 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- NJFMNPFATSYWHB-UHFFFAOYSA-N ac1l9hgr Chemical compound [Fe].[Fe] NJFMNPFATSYWHB-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 230000003143 atherosclerotic effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 208000002352 blister Diseases 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
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- 230000005494 condensation Effects 0.000 description 1
- 239000006063 cullet Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
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- 238000001035 drying Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
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- 239000003822 epoxy resin Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
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- 230000002349 favourable effect Effects 0.000 description 1
- 230000002550 fecal effect Effects 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- XUCNUKMRBVNAPB-UHFFFAOYSA-N fluoroethene Chemical compound FC=C XUCNUKMRBVNAPB-UHFFFAOYSA-N 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
- 238000007499 fusion processing Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000002241 glass-ceramic Substances 0.000 description 1
- 238000007531 graphite casting Methods 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000006132 parent glass Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 229920003226 polyurethane urea Polymers 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
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- 230000008016 vaporization Effects 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/02—Rigid pipes of metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
- C21C1/105—Nodularising additive agents
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The present invention discloses a kind of oil pipeline ductile iron pipe, including：One end is equipped with socket, the tube body that the other end is equipped with bellmouth and the inorganic nano lining coating on inboard wall of tube body.The oil pipeline pipe of the present invention is using high-tenacity nodular cast iron as base material, corrosion resistance is strong, long lifespan, there is inorganic nano lining coating grease to try to shirk responsibility effect, inner wall does not hang wax, does not lump when transfer oil, transporting resistance substantially reduces, the energy consumption of pressurized delivered is substantially reduced, and with the ability for resisting the geological disasters such as strong earthquakes.The invention also discloses the preparation processes of the oil pipeline ductile iron pipe.Oil pipeline ductile iron pipe prepared by preparation process of the present invention is without casting flaws such as slag blister, sand holes, stomata, shrinkage cavity and porosities, uniform wall thickness, dense structure, air-tightness is good, bearing capacity is high, the service life of petroleum pipeline can be improved applied to the laying of oil pipeline, reduce the overall cost of Oil Pipeline construction and ordinary maintenance.
Description
Technical field
The present invention relates to a kind of oil pipeline ductile iron pipe, its preparation process and applications.
Background technology
The petroleum pipeline spool that uses in the world at present, be general steel plate and special pipe line steel steel plate is rolled, is welded and
At steel pipe.These steel pipes need after first transporting to the erecting bed of oil pipeline, and one section of ground of another section is welded to connect, then
Non-destructive inspection of weld, pressure testing, anti-corrosion treatment etc. are carried out again, if oil pipeline is to be laid on cold districts, also to be added
External thermal insulation simultaneously carries out heating pressurized delivered to oil.These petroleum pipeline spools have the following problems at present：
1. the corrosion resistance of steel pipe is poor, especially electrocorrosion-resisting poor ability, therefore the projected life of pipeline is all less
It is long, in the higher area of some Soil salinities, or due to sulphur, the hydrogen sulfide equal size in oil are higher, with the water knot in crude oil
Synthesis acid increases the corrosion to steel pipe inner wall, even if the steel pipe of oil pipeline is welded using thick steel sheet, extends and uses the longevity
The effect of life is also very limited, and petroleum pipeline spool is once corroded, and will result in that crude oil leakage is excessive, this not only results in resource
Waste, can also seriously pollute surrounding enviroment, if repairing or repairing not in time explosion improper, or even that vaporizing oil-gas can be caused,
Cause serious personnel casualty accidents；
2. containing viscous ingredients such as paraffin, resin and asphalts in oil, pipeline resistance is big, often needs to pressurize defeated
It send, and these ingredients are easily attached on petroleum pipeline inner wall in transmission process, in the course of time, easily causes line clogging.In addition, working as
When ambient temperature is lower, when being less than oil solidification point, oil is solid-state by settable liquid, and the oil transportation resistance of pipeline is further
Increase.Therefore, cold district in winter, petroleum pipeline spool need to add external thermal insulation, and carry out heating pressurized delivered to oil.Mesh
Before, usually oil pipeline use outer wall of steel pipe package rock wool be used as insulating layer, but outer wall of steel pipe wrap up rock wool heat-preservation layer thickness
Greatly, not only increase transportation cost, also as the intensity of rock wool heat-preservation layer is very low, cracky in transport and installation process and cause
Loss；
3. the steel pipe of oil pipeline carries out the welding of pipeline connection after needing to transport to scene, carries out lossless spy one by one to weld seam
Wound, pressure testing, do at the scene pipeline corrosion protection processing etc., not only complicated for operation, the guarantee difficulty of execute-in-place quality is big, construction period
Long, the operating expenses of pipe engineering construction is very high；
4. since the penstock installation of oil pipeline is piecewise welding, rigidly connected, prevent from expanding with heat and contract with cold although it has
The structure of function, but the ability for resisting strong earthquakes destruction is not had, especially through corrosion in a few years, after tube wall is thinning,
The strength and toughness of steel pipe reduces, when steel pipe stretched by external force, squeeze, shear, distort and weight is pounded when touching, it is easy to destroy
Even it is broken.
Therefore, still it is badly in need of at present with a kind of corrosion resistance is strong, safe, construction and installation are quick, flow resistance is small, protects
Temp effect is good, and can resist the nonpetroleum line pipe of the geological disasters such as strong earthquakes destruction.
Invention content
One of present invention is designed to provide a kind of oil pipeline ductile iron pipe, is asked with solving above-mentioned technology
At least one of topic.
It is another object of the present invention to provide application of the above-mentioned oil pipeline ductile iron pipe in oil pipeline,
At least one of to solve the above technical problems.
It is another object of the present invention to provide the preparation processes of above-mentioned oil pipeline ductile iron pipe, in solution
State at least one of technical problem.
According to an aspect of the invention, there is provided a kind of oil pipeline ductile iron pipe, including：One end is equipped with and holds
The tube body and the inorganic nano lining coating on inboard wall of tube body that mouth, the other end are equipped with socket.
For oil pipeline ductile iron pipe tube body of the present invention using high-tenacity nodular cast iron as base material, corrosion resistance is strong, tough
Property high, long lifespan, and with the ability for resisting the geological disasters such as strong earthquakes, can avoid oil pipeline corrosion oil leak cause it is various
Accident；Oil pipeline inorganic nano lining coating made of ductile iron pipe inner wall coating inorganic nano material has good
The grease effect of trying to shirk responsibility, therefore, when oil pipeline of the present invention is used for transfer oil with ductile iron pipe, inner wall does not hang wax, does not lump,
Transporting resistance substantially reduces, and reduces the energy consumption of oil pressurized delivered.
Oil pipeline of the present invention has bellmouth and socket with ductile iron pipe, when connection two adjacent ductile iron pipe bodies it
Between connected with socket by bellmouth, using flexible mechanical sealed interface, and the junction of bellmouth and socket is equipped with high temperature resistant, oil resistant
Sealing rubber ring made of rubber material.When oil pipeline of the present invention is connected with ductile iron pipe, interface form can be S type machines
Tool formula sealed interface, N1Type mechanical sealing interface or SIIType mechanical sealing interface when connection, is not necessarily to site welding, installation
The speed of simple and quick construction, pipe installation construction is remarkably improved, and the overall cost of pipeline construction and ordinary maintenance significantly drops
It is low.In addition, flexible mechanical sealed interface favorable sealing property, can be such that oil pipeline ductile iron pipe has flexible and good
Good retractility, therefore earthquake can be resisted and be applied to the external force such as the stretching, extruding, distortion of pipe, enhance oil pipeline ball
Resist the ability of strong earthquakes destruction in graphite cast iron pipe road.
Inorganic nano material of the present invention refer to composition main body be inorganic material, it is at least one-dimensional in three dimensions
The material for being in nanoscale range (1~100nm) or being made of as basic unit them, can be nano silicon dioxide,
It is one or more in nano-titanium dioxide, nano aluminium oxide etc..In the present invention, the preparation method of inorganic nano lining coating with
Coating layer thickness can be arranged on demand, and coating layer thickness is preferably 5~15 μm.
In some embodiments, oil pipeline ductile iron pipe of the present invention can also include on the outer wall of tube body
Insulating layer.As a result, when oil pipeline is used for transfer oil with ductile iron pipe, it can prevent ambient temperature from reducing, oil
Solidification causes transporting resistance to increase, while can also reduce thermal loss when petroleum conveying, saves the energy of petroleum
Consumption.
In some embodiments, above-mentioned insulating layer can be crystallite insulating layer, and crystallite insulating layer is set to the outer wall of tube body
On, thickness is preferably 10~25mm.Crystallite insulating layer is made by micro crystal material, and thickness can be reduced than the thickness of rock wool heat-preservation layer
90% or so, to make the transport of pipe be obviously reduced with installation outer diameter, and the intensity of crystallite insulating layer, hardness are high, not rapid wear
It is bad, facilitate the transport and installation of pipe；Micro crystal material good heat insulating simultaneously can substantially reduce oil when being used for transfer oil
The thermal loss of transmission process saves the energy consumption of petroleum.
Micro crystal material of the present invention is also known as devitrified glass or glass ceramics, refers to (will individually may not be used added with shape Nucleating Agent
Add) specific composition parent glass, answering with one or more crystallite phases and residual glass phase is made by controlling crystallization
Condensation material, has anti-corrosion, an excellent properties such as heat-resisting, in the embodiment of the present invention, preferably with cullet, flyash, nonmetallic ore etc.
For primary raw material, foaming agent, nucleating agent and additive etc. is added, made of the techniques such as preheated, melting, foaming, crystallization, annealing
Porous devitrified glass, i.e. crystallite foam glass.
In some embodiments, oil pipeline ductile iron pipe of the present invention can also include on the outer wall of tube body
Spelter coating, and insulating layer be set to tube body spelter coating on, spelter coating thickness is preferably not less than 40 μm.Thus, it is possible to improve stone
The anti-corrosion capability of oil pipeline ductile iron pipe.
In some embodiments, oil pipeline ductile iron pipe of the present invention can also include interior protective coating, interior anti-
It protects coating to be set on the inner wall of tube body and between inboard wall of tube body and inorganic nano lining coating, the coating material of interior protective coating
Material can be epoxy resin, polyurethane or Lauxite, and coating layer thickness can be 45~80 μm.Thus, it is possible to improve petroleum pipeline
The anti-corrosion capability of line ductile iron pipe inner wall.
In some embodiments, oil pipeline ductile iron pipe of the present invention can also include external protective coating, outer anti-
Shield coating can be set on spelter coating and (i.e. external protective coating is coated on spelter coating, is protected between spelter coating and insulating layer
Warm layer is set on external protective coating) or coated on insulating layer and outside insulating layer, the coating material of external protective coating can be with
For asphalt caulk, bituminous epoxy paint, polyurethane or polyureas.Thus, it is possible to improve the anti-corrosion of oil pipeline spheroidal graphite cast-iron pipe outer wall
Erosion ability.To the oil pipeline ductile iron pipe for torrid areas, outer wall need not generally set insulating layer, need to only coat outer
Protective coating.
In some embodiments, the socket of oil pipeline ductile iron pipe of the present invention can not have inorganic nano
Lining coating, interior protective coating and/or spigot can not have insulating layer and external protective coating.It is possible thereby to facilitate adjacent stone
When oil pipeline between ductile iron pipe with connecting, inorganic nano lining coating, interior protective coating, external protective coating and heat preservation are realized
The continuous transition of layer.
S is preferably used when petrochina pipeline of the embodiment of the present invention is connected with ductile iron pipeIIType mechanical sealing interface, stone
Oil pipeline is with back stop slot is provided on ductile iron pipe socket outer surface, when pipe connects, socket is inserted into petroleum pipeline to be connected
In the bellmouth of line ductile iron pipe, socket is equipped with differential, and differential is fixedly connected with bellmouth edge by screw bolt and nut, is held
Mouth inner surface is equipped with embedded groove, and embedded groove is interior to be sequentially embedded sealing rubber ring, cage ring and lock ring inside from embedded groove port,
Sealing rubber ring is pushed down in the bottom end of differential, and the bottom end of lock ring is pressed on back stop slot, and sealing rubber ring, cage ring are together with locking collar combination
And it is formed and is interference fitted with the jack part for being inserted into bellmouth.
In some embodiments, the material for preparing of sealing rubber ring can be hydrogenated nitrile-butadiene rubber, acrylic rubber, fluorine
The oil-resistant rubber materials such as rubber, fluorine silicone rubber or polytetrafluoroethylene (PTFE).Thus, it is possible to extend the service life of oil pipeline.
According to another aspect of the present invention, above-mentioned oil pipeline ductile iron pipe answering in oil pipeline is provided
With can be specifically the application in oil grows defeated oil pipeline and oilfield internal oil pipeline.
Oil pipeline provided by the invention compared with existing oil pipeline steel pipe, has corrosion-resistant energy with ductile iron pipe
The advantages that power is strong, toughness is high, construction and installation are quick, oil transportation resistance is small, good heat insulating can be applied to be laid with conveying respectively
The oil long-distance transport pipes and oilfield internal oil pipeline of quasi-oil, reduce the overall cost of Oil Pipeline construction and ordinary maintenance with
And reduce the energy consumption of oil transportation.
According to another aspect of the present invention, the preparation method of above-mentioned oil pipeline ductile iron pipe is provided, including
Following steps：
The preparation of S1, iron liquid：Furnace charge is smelted into original iron melt and is superheated to not less than 1500 DEG C, according to iron liquid chemical composition
Setting value adjustment original iron melt chemical composition composition；
S2, spheroidising：Spheroidising is carried out to the original iron melt for having adjusted chemical composition composition using nodulizer, and will
Iron liquid after spheroidising injects spheroidal graphite cast-iron dedicated pouring electric furnace, using spheroidal graphite cast-iron dedicated pouring electric furnace by the cast of iron liquid
Temperature keeps the critical-temperature not less than iron liquid；
S3, coating thermodyn process centrifugal casting：After completing upper bellmouth core to the heat pipe mould that the adiabatic coating of spraying has been dried, drive
Dynamic pipe die rotation, and when the centrifugal force of pipe die rotation reaches centrifugal force setting value, it will be in spheroidal graphite cast-iron dedicated pouring electric furnace
Iron liquid is injected through quantitative packet in pipe die, and is carried out current-following inoculation processing to iron liquid in casting process and carried out cooling place to pipe die
Reason, after casting complete, when the ductile iron pipe blank of forming to be solidified is cooled to set temperature, by ductile iron pipe blank from pipe
It is extracted in mould；
S4, annealing：Ductile iron pipe blank is made annealing treatment；
S5, finishing：Finished machined is carried out to the ductile iron pipe blank after annealing；
S6, hermeticity experiment：According to oil pipeline to be laid to the pressure requirements of ductile iron pipe (be usually 3.0~
5.0MPa), i.e., the test pressure of the design discharge pressure setting ductile iron pipe blank of oil pipeline to be laid, to finished machined
Ductile iron pipe blank afterwards carries out air-tight test, wherein design of the test pressure not less than oil pipeline to be laid conveys
1.20 times of pressure；
The preparation of S7, inorganic nano lining coating：In the inner wall coating of the ductile iron pipe blank of air-tight test qualification
Inorganic nano material prepares inorganic nano lining coating.
First, it is that the original iron melt that will be melted out has been superheated to 1500 DEG C when prepared by iron liquid in preparation process of the invention
Or more, since original iron melt to be superheated to the temperature not less than 1500 DEG C in iron liquid preparatory phase, carbon can be promoted to play to iron
The deoxidizing purification of liquid acts on, and reaches the pre-spheroidizing treatment effect to original iron melt, to be conducive to the nodularization of graphite；In addition, at this
In the preparation process of invention, the adjustment of chemical composition composition has been carried out to original iron melt also according to the setting value of iron liquid chemical composition,
Due to ductile iron pipe bore specification and the difference of corresponding wall thickness, in setting time after making the ductile iron pipe of different size pour into a mould
There are difference in cooling velocity, to prevent the as cast condition blank of ductile iron pipe from free cementite occur, to iron liquid carbon equivalent
Control can be distinguished according to the requirement of different bores, the ductile iron pipe of wall thickness, provide different chemical composition and carbon equivalent
Setting value, and be adjusted accordingly；In addition the heat pipe mould of inner-wall spraying heat insulating coating can to avoid iron liquid Quench, so as to
It enough avoids the as cast condition blank of ductile iron pipe during centrifugal casting from free cementite occur, forms white structure.
Secondly, the present invention in be to temperature at 1500 DEG C or more and have adjusted chemical composition composition original iron melt carry out ball
Change is handled, and the iron liquid after spheroidising has been injected into spheroidal graphite cast-iron dedicated pouring electric furnace and (has been carried in the embodiment of the present invention
And spheroidal graphite cast-iron dedicated pouring electric furnace be patent CN101658901B disclosed in pouring electric furnace equipment), after spheroidising
Iron liquid is injected in spheroidal graphite cast-iron dedicated pouring electric furnace, on the one hand further can be carried out desulfurization, deoxidation to iron liquid, on the other hand may be used
To stablize the residual Mg amounts in iron liquid, so as to avoid iron liquid decaying spheroidisation, the nodularization grade of ductile iron pipe obtained ensure that
Not, and the mechanical performances such as its toughness, intensity are stabilized；The pouring temperature of iron liquid is remained at into facing not less than iron liquid simultaneously
The temperature range of boundary's temperature (i.e. 1420~1480 DEG C), it is always non-oxidizing molten iron purifying to make iron liquid, avoids spheroidal graphite casting
Iron pipe generates the casting flaws such as sand holes, slag blister during centrifugal casting, it ensure that the pouring temperature of iron liquid maintains always
Stable high temperature level is conducive to eliminate the inclusion defects such as stomata, sand holes, slag blister, and high temperature also enables the mobility of iron liquid big
Amplitude improves, and avoids the ductile iron pipe waste product for the defects of generating with cold shut, misrun.
Again, in preparation process of the present invention, ductile iron pipe blank is prepared using coating thermodyn process centrifugal casting technique, and
And when being that the centrifugal force rotated in pipe die reaches centrifugal force setting value, then start centrifugal casting process, such preparation process makes
Obtain to start casting process under suitable centrifugal force according to demand, the contracting of the ductile iron pipe blank to prepare
Loose situation.Such as in order to overcome Shrinkage cavity when ductile iron solidification to be inclined to the internal defect generated, centrifugal casting process is adopted
With the pouring technology of the big centrifugal force of high rotating speed, it ensure that the high temperature iron liquid of cast always under the action of huge centrifugal force by
Gradually solidification (preferably starts to pour into a mould, Bhide La Wofa in the embodiment of the present invention when pipe die rotation centrifugal force reaches 80~100G
Pipe die rotation centrifugal force 40~50G improve 1 times or so) so that high temperature iron liquid is in pipe die always in the work of huge centrifugal force
It is squeezed, and cannot realized spheroidal graphite cast-iron iron liquid to pipe die center position free wxpansion and solidified in atherosclerotic to pipe die inner wall with lower
And graphitization expansion overlap the stage pressure from feeding, to ensure that ductile iron pipe dense structure, heavy wall part thickness are equal
It is even and without casting flaws such as shrinkage cavity and porosities, it is ensured that wall thickness it is highly uniform with it is fine and close, without being mingled with, therefore spheroidal graphite obtained casts
Iron pipe air-tightness is good.In addition, the suitable carbon equivalent of iron liquid adds instant inoculation, make the base of cast condition ductile iron pipe blank obtained
Body tissue is without free cementite.
In addition, the present invention uses coating thermodyn process centrifugal casting technique, need first to be preheated to pipe die before adiabatic coating spraying
200~220 DEG C, it is ensured that adiabatic coating can parch rapidly when spraying, can avoid due to adiabatic coating when iron liquid injects pipe die
It detonates and pipe die is caused to be damaged by iron liquid ablation, to cause production disruption accident.
It then,, may be in cold air since tube body temperature is high because ductile iron pipe blank in pipe die after extracting
Normalizing occurs and generates a large amount of pearlite, the elongation percentage of ductile iron pipe blank is caused to decline, so in preparation process of the present invention,
Ductile iron pipe blank carries out eliminating after extracting the annealing of pearlite in pipe die, to obtain matrix with iron element
Based on body, content of pearlite in alloy is low, the ductile iron pipe of good percentage elongation.
Finally, after carrying out finished machined to the ductile iron pipe after annealing, to ensure the air-tightness of ductile iron pipe, together
When avoid influence of the coating to ductile iron pipe air-tight test real result on tube body, in preparation process of the present invention,
Air-tight test first is carried out to the ductile iron pipe after finished machined before preparing inorganic nano lining coating, and test pressure is set
1.20 times of the design discharge pressure not less than oil pipeline to be laid are set to, ensures that the height of ductile iron pipe air-tightness
Reliability.
In the iron liquid preparation process of the embodiment of the present invention, to S contents no more than 0.12% iron liquid can be without stove outside
Desulfurization process is directly injected into induction electric mantle heater, in the chemical composition composition for adjusting original iron melt, also need not deliberately be contained to S
Amount is controlled, this is because：1) desulfurization effect of spheroidising is fine, and it is 1500 DEG C to be not more than 0.2%, temperature to sulfur content
High temperature, high-sulfur iron liquid can be processed into qualified spheroidal graphite cast-iron iron liquid, and can the sulfur content of iron liquid after nodularization is de- to less than
0.01% level；2) spheroidal graphite cast-iron dedicated pouring electric furnace permission need not take off Slag treatment after spheroidising, and directly by nodularization
MgS slags and MgO slags in processing packet are directly poured into stove, by the S in slag under the action of DC electrolysis2-And O2-Anion is de-
Fall, Mg in slag2+Cation is reduced into Mg when touching the iron liquid as cathode and reenters iron liquid, with Mg from iron liquid
Escape loss forms dynamic equilibrium, stabilizes the Mg residual quantities in iron liquid, avoids decaying spheroidisation, and makes MgS slags and MgO scorification
Evil is profit, realizes recycling for magnesium metal.And this also simplifies production technology, improve the ductile iron pipe prepared
The consistency of mechanical performance and quality.
In the embodiment of the present invention, can select the pig iron, steel scrap, iron filings, carbon containing non-burning brick and foundry returns (predominantly pipe fitting or
The defective work of the dead head of other casting and a small amount of ductile iron pipe and pipe fitting) in it is one or more be used as furnace charge, according to
The chemical composition composition of different furnace charges, in fusion process chemical composition loss and iron liquid chemical composition that may be present setting value
Dispensing is carried out, makes the composition of the original iron melt chemical composition after melting close to its setting value, simplifies the work of iron liquid chemical composition adjustment
Skill processing.
In the embodiment of the present invention, the technique that furnace charge is smelted into original iron melt may be used furnace cupola-electric induction furnace duplex and melt
Sweetening process can also use blase furnace cast iron iron liquid to enter " short route " smelter of frequency conversion coreless induction furnace adjustment chemical composition
Skill.Original iron melt is superheated to not less than 1500 DEG C in the embodiment of the present invention, can be melted to furnace charge by using furnace cupola
Refining, original iron melt temperature directly reaches 1500 DEG C or more (i.e. the tapping temperature of original iron melt is not less than 1500 DEG C) realizations after melting
, can also be that the original iron melt after melting is overheated in electric induction furnace, makes original iron melt by using other melting modes
Temperature reaches 1500 DEG C or more (that is, electric induction furnace holding temperature is set in 1500 DEG C or more) realization.
Iron liquid progress current-following inoculation processing can be promoted to be graphitized in casting process of the embodiment of the present invention, prevent from pouring into a mould
Iron liquid decaying spheroidisation in journey avoids the generation of free cementite.Current-following inoculation processing inovulant used is in the embodiment of the present invention
Conventional inovulant can be one kind or combinations thereof in silicon iron inoculator, silicon titanate innoculant, preferably 75FeSi inovulants, dosage
It is the 0.2~0.4% of iron liquid weight.
In the embodiment of the present invention, the cooling treatment carried out to pipe die in casting process is preferably shower water cooling treatment.It is solidifying
Admittedly the ductile iron pipe blank shaped is in cooling procedure, can continue to carry out cooling treatment to pipe die；To solidifying postcooling speed
Relatively slow heavy caliber thick wall ductile iron pipe can also cast the spheroidal graphite solidified in pipe die to accelerate its cooling velocity
Iron pipe blank takes blowing or atomized water spray measure.
The technique for carrying out spheroidising in the embodiment of the present invention to the original iron melt for having adjusted chemical composition composition is preferably
It does not make a difference to iron liquid carbon equivalent and the Feed aluminum wire of significant desulfurization effect or subcontracts method.Wherein, it need to be used by adjusting nodulizer
Amount makes the residual quantity of Mg in iron liquid after spheroidising be not less than 0.035%.
In the embodiment of the present invention, finished machined includes mill in bellmouth, mill, inner wall reconditioning, Pipe Cutting, chamfering and S outside socket
The flange drilling of the sealed interfaces ductile iron pipe such as type, N-type.It is to improve the table at these positions that mill, socket are ground outside in bellmouth
Face finish, to further increase spheroidal graphite cast-iron when it being allow to coordinate with sealing rubber ring in ductile iron pipe connection procedure
The sealed pressure of pipe.
In order to ensure the high reliability of product, in the embodiment of the present invention, oil pipeline is on ductile iron pipe production line
Air-tight test generally uses test pressure to be not less than 20 seconds not less than 5.0MPa (reaching as high as 6.0MPa), dwell time
Check system, the ductile iron pipe of pass the test can continue to complete subsequent inside and outside coating according to demand, final inspection is tested, sprays trade mark
With the spray processes such as digitized markers, then bundling storage become oil pipeline ductile iron pipe finished product.
In some embodiments, centrifugal force setting value is not less than 80G, and is not higher than 100G.Due to smaller in centrifugal force
Shi Jinhang cast can lead to shrinkage porosite, shrinkage cavity defect, and pipe die can make pipe die and equipment because rotating speed is excessively high when centrifugal force is excessive
Stability and device security are deteriorated, and therefore, set the setting speed of centrifugal force to 80G~100G (spheroidal graphites of different bores
Cast iron pipe centrifugal force value is different, wherein small-bore pipe value is close to upper limit value, and large-diameter pipe value is close to lower limiting value), it can be with
While avoiding shrinkage porosite, shrinkage defect, also ensure the stability of equipment and pipe die operating, and then ensures the spheroidal graphite produced casting
The quality and guarantee production safety of iron pipe.
In some embodiments, the set temperature that the ductile iron pipe blank of solidification forming is cooled in pipe die can be
760~830 DEG C.When tube drawing temperature is higher than 850 DEG C, ductile iron pipe intensity is insufficient, and tube drawing easily leads to spheroidal graphite cast-iron at a temperature of this
Pipe deforms during tube drawing, and when tube drawing temperature is less than temperature (about 730 DEG C) of eutectoid point, ductile iron pipe can occur altogether
Analysis transformation, causes lattice transformation to cause volume transition, spheroidal graphite cast-iron tube swelling is made to cause difficulty in decannulation.Therefore, tube drawing temperature control
System can prevent difficulty in decannulation at 760~830 DEG C and ductile iron pipe is avoided to deform.
In some embodiments, in step S2, the pouring temperature of iron liquid is protected using spheroidal graphite cast-iron dedicated pouring electric furnace
The critical-temperature not less than iron liquid is held, can be by the way that the holding temperature in spheroidal graphite cast-iron dedicated pouring electric furnace is set as 1430
~1480 DEG C realization.Holding temperature in spheroidal graphite cast-iron dedicated pouring electric furnace is set as 1430~1480 DEG C, ball can be made
When in the iron liquid injection pipe die in black cast iron dedicated pouring electric furnace, holding iron liquid is non-oxidizing molten iron purifying, thus both may be used
To ensure that iron liquid has enough mobility, and it can guarantee that the iron liquid after cast in pipe die can also be under high centrifugal force effect still
Keep one liquid time, to avoid ductile iron pipe generate misrun, cold shut, shrinkage porosite, shrinkage cavity, sand holes, slag blister, stomata,
The casting flaws such as wall unevenness and waste product, spheroidal graphite cast-iron tube wall obtained is fine and close, uniform, zero defect, air-tightness are good, can be used for
The laying of oil pipeline.
In some embodiments, nodulizer can be magnesium ingot, and the setting value of iron liquid chemical composition can be：C be 3.4~
3.7%, Si is 2.0~2.6%,
It is formed according to the chemical composition of the setting value adjustment original iron melt to iron liquid chemical composition and includes：
Based on above-mentioned setting value adjust original iron melt in carbon and silicon mass fraction so that in original iron melt carbon mass fraction
Not higher than 3.7%, and make carbon equivalent reach eutectic composition (i.e. carbon equivalent up to 4.26%) or make carbon equivalent reach 4.1%~
4.3%.Be conducive to ductile iron pipe forming in coating thermodyn process centrifugal casting process treatment process of the present invention as a result, and obtain base
The ductile iron pipe blank that free cementite is free of in body tissue, while ensureing ductile iron pipe blank quality, moreover it is possible to letter
Change subsequent annealing process.Meanwhile using magnesium ingot as nodulizer, nodulizer cost on the one hand can be greatly lowered, it is another
Aspect also avoids influence and interference of the elements such as the Si in rare-earth ferrosilicon magnesium nodulizer to iron liquid ingredient, can also save a large amount of
Valuable rare earth element.
In some embodiments, in step S2, the former iron that the method for subcontracting is formed to having adjusted chemical composition may be used
Liquid carries out spheroidising, wherein the dosage of magnesium ingot nodulizer is the 0.10~0.20% of original iron melt weight.Using method of subcontracting, ball
Change high treating effect, and nodulizer vaporized in the reative cell subcontracted it is speed controlled without exploding.The use of nodulizer
Amount is the 0.10~0.15% of original iron melt weight, you can Mg contents are not less than 0.04% in iron liquid after the completion of guarantee spheroidising,
Reach ideal nodularization effect, when S contents are more than 0.12% in original iron melt, the dosage of nodulizer can increase to original as needed
The 0.18~0.20% of iron liquid weight.
In some embodiments, can also include the following steps before annealing：
The outer wall of the ductile iron pipe blank of preparation is cleaned with water, is purged；
Outer wall is cleaned with water, purge it is clean after ductile iron pipe blank carry out Ultrasonic Nondestructive, determine spheroidal graphite cast-iron
Whether whether qualified and ductile iron pipe blank tube body has casting flaw and other damage defects to the nodulizing grade of pipe blank.
If the actual temperature of the iron liquid of injection pipe die is sufficiently high (such as not less than 1400 DEG C) when cast, ductile iron pipe
When blank is extracted from pipe die, the adiabatic coating meeting almost all for being sprayed on pipe die inner wall hangs over the outer wall of ductile iron pipe blank
It is carried over, therefore, it is necessary to be cleaned with water to ductile iron pipe blank outer wall, then is purged, by ductile iron pipe blank outer wall
Remaining adiabatic coating cleans up.Purging preferably purges spheroidal graphite cast-iron pipe outer wall using high steam.
Brush pipe needs to carry out Ultrasonic Nondestructive to ductile iron pipe blank, determines spheroidal graphite cast-iron with after the completion of purging
Whether the nodulizing grade of pipe blank qualified, and determine ductile iron pipe blank tube body whether have slag blister, subcutaneous blowhole, sand holes,
Other damage defects such as the casting flaws such as cold shut, pipe, shrinkage cavity and porosity and crack damage.Nodulizing grade is qualified and is lacked without casting
It falls into and the ductile iron pipe blank of crack damage is denoted as inspection qualification, and underproof ductile iron pipe blank is denoted as inspection and does not conform to
Lattice melt down remelting directly as furnace charge.Ductile iron pipe blank is detected using ultrasonic wave, spheroidal graphite cast-iron can be rapidly completed
The non-destructive testing of pipe, under the premise of not damaging or not influencing spheroidal graphite cast-iron performance, whether complete detection ductile iron pipe
There are casting flaws and internal injury defect；Also, whether the nodulizing grade that ultrasonic wave is used to measure ductile iron pipe is qualified,
Its detection efficiency is far above traditional the methods of metallographic detection, or even can also quantitatively judge different groups of ductile iron pipe matrix
Part and its content；In addition, being detected to ductile iron pipe blank using ultrasonic wave, the high-volume ball of single specification may be implemented
The continuous on-line detection of graphite cast iron pipe is advantageously implemented the automation of ductile iron pipe production line.
In some embodiments, the annealing temperature of annealing can be 780~850 DEG C, annealing time be 20~
40min.Compared with traditional De Lawofa annealing process, the present invention has following clear superiority：1) preparation process system of the present invention
Free cementite is free of in the matrix of the ductile iron pipe blank obtained, only since normalizing occurs in air for tube body after tube drawing,
The eutectoid reaction occurred at this time can make pearlite exceeded, therefore it may only be necessary to ductile iron pipe eliminate the low temperature of pearlite
Annealing, you can obtain the high-elongation of ferrite content qualification, the ductile iron pipe of high tenacity, annealing can be substantially reduced in this way
The temperature (being reduced to 780~850 DEG C from traditional 980~1050 DEG C) of processing；2) annealing process of the present invention eliminates elimination Lay
Quick water cooling (or air-cooled) structure among the high annealing stage of family name's body and annealing kiln, the equipment for simplifying annealing lehr
Structure shortens annealing time, reduces the energy consumption of annealing, extends the service life of refractory material in annealing kiln；3) it avoids
Ductile iron pipe deforms the risk and loss due to spoiled work of (i.e. ductile iron pipe variation ellipse) due to burning；4) due to spheroidal graphite cast-iron
The wall thickness high uniformity of pipe ensure that the steady smoothness of annealing process, can avoid completely because of individual ductile iron pipe local wall thickness
(ductile iron pipe of fracture is blocked in annealing kiln the excessively thin serious consequence that fracture belt occurs after the heating, can be caused continuous
Formula tunnel Annealing Furnaces failure, or even cause halt production accident).
In some embodiments, can also include the following steps after making annealing treatment, before finished machined：
Spray zinc is carried out to the outer surface of the ductile iron pipe blank after annealing.
In the embodiment of the present invention, spray zinc can be realized by modes such as hot spray painted zinc, cold-applied zincs, and zinc coating thickness is not preferably small
In 40 μm.Spray zinc is carried out to the outer surface of the ductile iron pipe blank after annealing, is conducive to improve Surface of Nodular Cast Iron Pipe tolerance
The ability of galvano-cautery, at the same time it can also avoid follow-up ductile iron pipe blank during carrying out air-tight test, due to spheroidal graphite
Cast iron pipe blank tube body contacts with water and tube surfaces is caused to get rusty.
In some embodiments, can also include the following steps after step s 7：In inner wall coating inorganic nanometer
Insulating layer is prepared on the spelter coating of ductile iron pipe after lining coating.As a result, when oil pipeline ductile iron pipe is for conveying
When oil, it can prevent from reducing due to ambient temperature, oil solidification causes transporting resistance to increase, while can also reduce oil and add
Thermal loss when heated conveying saves the energy consumption of petroleum.
Description of the drawings
Fig. 1 is the structure chart of the oil pipeline ductile iron pipe of an embodiment of the present invention；
Fig. 2 is the sectional view of oil pipeline ductile iron pipe tube body shown in Fig. 1；
Fig. 3 is oil pipeline ductile iron pipe S shown in Fig. 1IIThe structure chart of type mechanical sealing interface.
Specific implementation mode
Embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.
Embodiment 1
Fig. 1 and Fig. 2 schematically shows a kind of oil pipeline ductile iron pipe of embodiment according to the present invention.
As shown, the oil pipeline ductile iron pipe includes the tube body 1 that wherein one end is equipped with bellmouth 11, the other end is equipped with socket 12
With coated on the inorganic nano lining coating 2 on 1 inner wall of tube body.
Inorganic nano lining coating 2 is made of inorganic nano material coating, and thickness can be 5~15 μm, the present embodiment
In, inorganic nano lining coating 2 is preferably made of nano silicon dioxide coating, and thickness is 10 μm.
In the present embodiment, oil pipeline ductile iron pipe further includes crystallite insulating layer 3 and spelter coating 4, wherein spelter coating
4 are coated on the outer wall of tube body 1, and crystallite insulating layer 3 is coated on spelter coating 4, that is, spelter coating 4 is located at 1 outer wall of tube body and crystallite
Between insulating layer 3.Wherein, 4 thickness of spelter coating is 40 μm；Crystallite insulating layer 3 is made of micro crystal material coating, in the present embodiment,
The thickness of the preferred crystallite foam glass of micro crystal material, crystallite insulating layer 3 is preferably 15mm.
As shown in Fig. 2, in the present embodiment, oil pipeline is sequentially coated with from inside to outside with 1 outer wall of ductile iron pipe tube body
Spelter coating 4 and crystallite insulating layer 3,1 inner wall of tube body coat organic/inorganic nano lining coating 2.
In the present embodiment, the socket of oil pipeline ductile iron pipe is not coated by inorganic nano lining coating 2, spigot
It is not coated by crystallite insulating layer 3.When oil pipeline is connected with ductile iron pipe, nothing between adjacent oil pipeline ductile iron pipe
Machine nanometer lining coating 2 and crystallite insulating layer 3 can be whole after ensure that oil pipeline is connected with ductile iron pipe with continuous transition
The continuity of a pipeline inorganic nano lining coating 2 and crystallite insulating layer 3.
In the present embodiment, S is preferably used when oil 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 oil pipeline ductile iron pipe
When, socket 12 is inserted into the bellmouth 11 of oil pipeline ductile iron pipe to be connected, and socket 12 is equipped with differential 63, differential 63
It is fixedly connected with 11 edge of bellmouth by bolt 61 and nut 62,11 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, and sealing rubber ring 64, cage ring 65 are with 66 three of lock ring closely and positioned at holding
Between 11 inner walls of mouth and 12 outer wall of socket, and sealing rubber ring 64, cage ring 65 are combined and 11 inner wall of bellmouth with lock ring 66
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, makes interface have
There is preferable anti-skid ability.
The material of sealing rubber ring 64 can be hydrogenated nitrile-butadiene rubber, acrylic rubber, fluorubber, fluorine silicone rubber or poly- four
Vinyl fluoride.In the present embodiment, the material of sealing rubber ring 64 is preferably polytetrafluoroethylene material.
The preparation of 2 oil pipeline ductile iron pipe of embodiment
Structure is as described in Example 1, and specification is the preparation side of the oil pipeline ductile iron pipe of DN1400 × 8000mm
Method includes the following steps：
It is prepared by S1, iron liquid：The setting value of iron liquid chemical composition is：C：3.4~3.7%, Si：2.2~2.4%, select life
Iron, steel scrap, iron filings and carbon containing iron oxide is non-burning brick is used as furnace charge, furnace charge is in the large-scale long furnace life oxygen-enriched furnace cupolas of 40t/h after dispensing
In be smelted into after original iron melt hydrocone type fecal iron separator through furnace cupola and carry out slag sluicing system, original iron melt by furnace cupola hydrocone type
Tapping hole, which injects two 60t large capacities, has core to incude in electric mantle heater, and the set temperature for incuding electric mantle heater is 1500 DEG C and protects
Constant temperature is held, cupola melting technique is set according to the setting value of iron liquid chemical composition, the tapping temperature of iron liquid is made to be more than 1500 DEG C,
Ensure that the chemical composition of original iron melt in range of set value, if exceeding range of set value, will use 10t frequency conversion centreless senses simultaneously
Answer furnace melting iron liquid and inject 60t large capacities have core incude electric mantle heater in be adjusted, with ensure above-mentioned iron liquid chemistry at
Divide and reach setting value, so that the mass fraction of carbon is not higher than 3.7% in original iron melt, and makes iron liquid by adjusting the mass fraction of silicon
Carbon equivalent is essentially eutectic composition (i.e. CE=4.2~4.3%)；
S2, spheroidising：The magnesium ingot of original iron melt weight 0.16% is put into the reative cell that the large size of 5t is subcontracted, induction is protected
Middle carry out spheroidising is subcontracted in original iron melt injection in warm electric furnace, Mg residual quantity >=0.04%, iron liquid in iron liquid after spheroidising
Middle chemical composition forms：C：3.4~3.7%, Si：2.2~2.4%, Mn：＜ 0.3%, P：＜ 0.07%, S：＜
0.01%；It need not be through taking off Slag treatment, it is special that iron liquid after spheroidising by 5t rotation fork truck deliveries is directly injected into 12t spheroidal graphite cast-iron
With pouring electric furnace, to make the pouring temperature of iron liquid keep the critical-temperature not less than iron liquid, in spheroidal graphite cast-iron dedicated pouring electric furnace
The holding temperature set is 1440 DEG C；
S3, coating thermodyn process centrifugal casting：Clean heat pipe mould inner wall spray is cleaned with water having been warmed up to 200 DEG C and inner wall
Adiabatic coating is applied, after adiabatic coating is thoroughly dry, pipe die is moved into upper core station, bellmouth core is mounted on pipe die by robot
Socket；After the completion of upper core, pipe die is moved in the pre- switching stations of centrifugal chiller, when pipe die goes to the 85% of setting speed in advance, is moved
To centrifugal casting station, (pipe die then moves to centrifugal casting at the 80~90% of the pre- switching stations prerotation of centrifugal chiller to setting speed
Station can save the time that centrifugal casting station promotes pipe die rotating speed, improve production efficiency)；After moving to centrifugal casting station,
Pipe die rotating speed is promoted to maximum value (centrifugal force reaches 98G) rapidly, starts to pour into a mould immediately, by spheroidal graphite cast-iron dedicated pouring electric furnace
In temperature be 1440 DEG C iron liquid injected in pipe die through quantitative packet, while add the 75FeSi inovulants of iron liquid weight 0.3% into
Row current-following inoculation, and at the same time carrying out water drenching cooling to pipe die；After iron liquid solidification forming, pipe die is moved to cooling station (can be after
It is continuous that water cooling sprayed to pipe die, at the same can into pipe die atomized water spray, accelerate the cooling of red heat ductile iron pipe blank), then manage
Mould moves to tube drawing station, and when pipe die Nodular Cast Iron Pipes blank is cooled to 830 DEG C or less, drawbench is by ductile iron pipe blank
It is extracted from pipe die；The blank pipe mould of ductile iron pipe blank is extracted, then successively by cleaning station, spray station etc. with water, by pipe die
Female end inner wall remnants coating is cleaned with water totally, again spray-on insulation and after drying, and cycle is for ductile iron pipe again
It prepares；
Wherein, adiabatic coating is water based paint, mainly by diatomite and bentonite by weight (18~20):1 configuration and
At coating layer thickness can be 0.8~1.2mm.Diatomite and bentonite be by weight in the present embodiment, in water base diatomite paint
18：1 configuration, coating layer thickness is 1.0mm.
Bellmouth core uses cold core box process, with large automatic core shooter coremaking.
S4, brush pipe and purging：The thermal insulation that the ductile iron pipe blank outer wall extracted from pipe die is taken out of using brush pipe machine
Coating is cleaned with water and high pressure steam purging, thoroughly removes the remaining adiabatic coating being sticked on ductile iron pipe blank outer wall；
S5, non-destructive testing：Brush pipe with purging after the completion of, outer wall is cleaned with water, purge totally after ductile iron pipe blank into
Row Ultrasonic Nondestructive judges that the nodulizing grade of cast tube blank, whether there is or not casting flaw or other damage defects, examine qualification
Ductile iron pipe enters subsequent processing, is judged as that the ductile iron pipe of waste product melts down remelting (under normal conditions herein as furnace charge
0.2%) rejection rate is no more than；
S6, process annealing：Through examining qualified ductile iron pipe blank to be transferred to annealing lehr annealing, annealing temperature control
For system at 780~850 DEG C, annealing time 30min, kiln discharge temperature is 680 DEG C；
S7, spray zinc：Hot spray painted zinc, zinc coating thickness are carried out to the outer surface of the ductile iron pipe blank after annealing using spray zinc machine
It is 40 μm；
S8, finished machined：Finished machined is carried out to the ductile iron pipe blank after the completion of spray zinc, including：It grinds bellmouth and inserts
Mouthful, grind inner wall, cut ring chamfering, flange drilling etc.；
S9, air-tight test：Air-tight test is carried out to the ductile iron pipe blank after finished machined, test pressure is
5.0MPa, dwell time ＞ 20s；Ductile iron pipe through air-tight test qualification enters subsequent processing, is judged as the ball of waste product
Graphite cast iron pipe melts down remelting as furnace charge (rejection rate is no more than 0.1% herein under normal conditions)；
It is prepared by S10, inorganic nano liner layer：It coats and receives on the inner wall of the ductile iron pipe blank of air-tight test qualification
Rice earth silicon material, prepares inorganic nano lining coating, and coating layer thickness is 10 μm；
It is prepared by S11, crystallite insulating layer：The zinc of ductile iron pipe blank after inner wall coating inorganic nanometer lining coating applies
Crystallite foam glass is coated on layer, prepares crystallite insulating layer, coating layer thickness 15mm；It carries out final inspection again later to test, to certified products
Trade mark and follow-up of quality digital code are sprayed to get oil pipeline ductile iron pipe finished product.
After testing, ductile iron pipe made from the present embodiment is without castings such as sand holes, slag blister, stomata, cold shut, shrinkage porosite, shrinkage cavities
Defect carries out metallographic and mechanical performance test through body sampling, and nodulizing grade is high and highly stable, and matrix is that ferrite is
Main P15, elongation percentage are 18~22%, and tensile strength is 440~480MPa.
In some embodiments, automation or half may be implemented certainly in the production line of oil pipeline of the present invention ductile iron pipe
Dynamicization, such as：(1) in iron liquid preparation process, furnace cupola can realize kiln run and smelting parameter by expert system intelligent control
Whole-process automatic control；(2) in spheroidizing process, spheroidising, iron can be completed on rotation fork truck by subcontracting interior iron liquid
Liquid transhipment such as topples over into dedicated pouring electric furnace at the actions；(3) it in adiabatic coating preparation process, can be carried by centrifugal chiller
It is spare at any time that coating automatic configuration stirring system is processed into qualified coating；(4) installation of bellmouth core can by robot or
Person's manipulator carries out etc., is conducive to use manpower and material resources sparingly as a result, improves the production efficiency of ductile iron pipe.
Above-described is only some embodiments of the present invention.For those of ordinary skill in the art, not
Under the premise of being detached from the invention design, various modifications and improvements can be made, these belong to the protection model of the present invention
It encloses.
Claims (18)
1. oil pipeline ductile iron pipe, which is characterized in that including：One end is equipped with bellmouth (11), the other end is equipped with socket
(12) tube body (1) and the inorganic nano lining coating (2) on the tube body (1) inner wall.
2. oil pipeline ductile iron pipe according to claim 1, which is characterized in that further include being set to the tube body
(1) insulating layer (3) on outer wall.
3. oil pipeline ductile iron pipe according to claim 2, which is characterized in that the insulating layer (3) is crystallite
Insulating layer.
4. oil 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 insulating layer (3) is set on the spelter coating (4) of the tube body (1).
5. oil pipeline ductile iron pipe according to claim 3 or 4, which is characterized in that the crystallite insulating layer
Thickness is 10~25mm.
6. oil pipeline ductile iron pipe according to claim 5, which is characterized in that including multiple tube bodies (1),
It is connected by bellmouth (11) and socket (12) between the adjacent ductile iron pipe body (1) of each two, and bellmouth (11) and socket (12)
Junction be equipped with sealing rubber ring made of oil-resistant rubber material.
7. oil pipeline ductile iron pipe according to claim 6, which is characterized in that the oil-resistant rubber material is hydrogen
Change nitrile rubber, acrylic rubber, fluorubber, fluorine silicone rubber or polytetrafluoroethylene (PTFE).
8. according to application of the claim 1~7 any one of them oil pipeline ductile iron pipe in oil pipeline.
9. the preparation process of oil pipeline ductile iron pipe described in claim 1, which is characterized in that include the following steps：
The preparation of S1, iron liquid：Furnace charge is smelted into original iron melt and is superheated to not less than 1500 DEG C, according to setting for iron liquid chemical composition
Definite value adjusts the chemical composition composition of original iron melt；
S2, spheroidising：Spheroidising is carried out to the original iron melt for having adjusted chemical composition composition using nodulizer, and by nodularization
Iron liquid that treated injects spheroidal graphite cast-iron dedicated pouring electric furnace, using the spheroidal graphite cast-iron dedicated pouring electric furnace by the cast of iron liquid
Temperature keeps the critical-temperature not less than iron liquid；
S3, coating thermodyn process centrifugal casting：After upper bellmouth core being completed to the heat pipe mould that the adiabatic coating of spraying has been dried, driving tube
Mould rotates, and when the centrifugal force of pipe die rotation reaches centrifugal force setting value, by the iron liquid in spheroidal graphite cast-iron dedicated pouring electric furnace
It is injected in pipe die through quantitative packet, and current-following inoculation processing is carried out to iron liquid in casting process and cooling treatment is carried out to pipe die,
After casting complete, when the ductile iron pipe blank of forming to be solidified is cooled to set temperature, by ductile iron pipe blank from pipe die
Middle extraction；
S4, annealing：The ductile iron pipe blank is made annealing treatment；
S5, finished machined：Finished machined is carried out to the ductile iron pipe blank after annealing；
S6, hermeticity experiment：The experiment pressure of ductile iron pipe blank is set according to the design discharge pressure of oil pipeline to be laid
Power carries out air-tight test, wherein test pressure is not less than petroleum pipeline to be laid to the ductile iron pipe blank after finished machined
1.20 times of the design discharge pressure of line；
The preparation of S7, inorganic nano lining coating：In the inner wall coating inorganic of the ductile iron pipe blank of air-tight test qualification
Nano material prepares inorganic nano lining coating to get oil pipeline ductile iron pipe finished product.
10. the preparation process of oil pipeline ductile iron pipe according to claim 9, which is characterized in that centrifugal force
The setting speed is not less than 80G, and is not higher than 100G.
11. the preparation process of oil pipeline ductile iron pipe according to claim 10, which is characterized in that solidification forming
The set temperature that is cooled to of ductile iron pipe blank be 760~830 DEG C.
12. the preparation process of oil pipeline ductile iron pipe according to claim 9, which is characterized in that in step S2,
The pouring temperature of iron liquid is kept into the critical-temperature not less than iron liquid using the spheroidal graphite cast-iron dedicated pouring electric furnace, be pass through by
Holding temperature in spheroidal graphite cast-iron dedicated pouring electric furnace be set as 1430~1480 DEG C realization.
13. according to the preparation process of claim 9~12 any one of them oil pipeline ductile iron pipe, feature exists
In the nodulizer is magnesium ingot, and the setting value of the iron liquid chemical composition is：C is 3.4~3.7%, Si is 2.0~2.6%,
The basis forms the chemical composition of the setting value adjustment original iron melt of iron liquid chemical composition：
The mass fraction that the carbon and silicon in original iron melt are adjusted based on above-mentioned setting value, so that the mass fraction of carbon is not high in original iron melt
In 3.7%, and so that carbon equivalent is reached eutectic composition or carbon equivalent is made to reach 4.1%~4.3%.
14. the preparation process of oil pipeline ductile iron pipe according to claim 13, which is characterized in that step S2
In, spheroidising, the wherein dosage of magnesium ingot nodulizer are carried out to the original iron melt for having adjusted chemical composition composition using method of subcontracting
It is the 0.10~0.20% of original iron melt weight.
15. the preparation process of oil pipeline ductile iron pipe according to claim 14, which is characterized in that moved back described
Further include following steps before fire processing：
The outer wall of the ductile iron pipe blank of preparation is cleaned with water, is purged；
Outer wall is cleaned with water, purge it is clean after ductile iron pipe blank carry out Ultrasonic Nondestructive, determine ductile iron pipe hair
Whether whether qualified and ductile iron pipe blank tube body has casting flaw and other damage defects to the nodulizing grade of base.
16. the preparation process of oil pipeline ductile iron pipe according to claim 15, which is characterized in that the annealing
The annealing temperature of processing is 780~850 DEG C, and annealing time is 20~40min.
17. the preparation process of oil pipeline ductile iron pipe according to claim 16, which is characterized in that moved back described
After fire processing, before finished machined further include following steps：
Spray zinc is carried out to the outer surface of the ductile iron pipe blank after annealing.
18. the preparation process of oil pipeline ductile iron pipe according to claim 17, which is characterized in that in step S7
Further include following steps later：Heat preservation is prepared on the spelter coating of ductile iron pipe after inner wall coating inorganic nanometer lining coating
Layer.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810362361.9A CN108273974B (en) | 2018-04-20 | 2018-04-20 | Nodular cast iron pipe for petroleum pipeline, preparation process and application thereof |
| PCT/CN2019/082501 WO2019201180A1 (en) | 2018-04-20 | 2019-04-12 | Spheroidal graphite cast iron pipe for petroleum pipeline, preparation process and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810362361.9A CN108273974B (en) | 2018-04-20 | 2018-04-20 | Nodular cast iron pipe for petroleum pipeline, preparation process and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108273974A true CN108273974A (en) | 2018-07-13 |
| CN108273974B CN108273974B (en) | 2020-06-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810362361.9A Active CN108273974B (en) | 2018-04-20 | 2018-04-20 | Nodular cast iron pipe for petroleum pipeline, preparation process and application thereof |
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| WO (1) | WO2019201180A1 (en) |
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| CN110039023A (en) * | 2019-05-20 | 2019-07-23 | 新兴铸管股份有限公司 | Bellmouth device for ductile iron pipe production |
| 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 |
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| 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 |
| CN115199833A (en) * | 2022-07-29 | 2022-10-18 | 德庆奥新宇联合管道有限公司 | Pipe for long-distance natural gas pipeline, preparation process and installation method of long-distance natural gas pipeline |
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| WO2019201180A1 (en) | 2019-10-24 |
| CN108273974B (en) | 2020-06-26 |
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