CN104006229B - A kind of stainless steel belt composite pipe and preparation method thereof - Google Patents
A kind of stainless steel belt composite pipe and preparation method thereof Download PDFInfo
- Publication number
- CN104006229B CN104006229B CN201410269104.2A CN201410269104A CN104006229B CN 104006229 B CN104006229 B CN 104006229B CN 201410269104 A CN201410269104 A CN 201410269104A CN 104006229 B CN104006229 B CN 104006229B
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- layer
- stainless steel
- steel belt
- wound around
- glass fiber
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 39
- 239000010935 stainless steel Substances 0.000 title claims abstract description 39
- 239000002131 composite material Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000010410 layer Substances 0.000 claims abstract description 58
- 239000003365 glass fiber Substances 0.000 claims abstract description 48
- 239000011152 fibreglass Substances 0.000 claims abstract description 32
- 239000011230 binding agent Substances 0.000 claims abstract description 24
- 238000010276 construction Methods 0.000 claims abstract description 23
- 239000004744 fabric Substances 0.000 claims abstract description 16
- 239000011241 protective layer Substances 0.000 claims abstract description 14
- 238000009940 knitting Methods 0.000 claims abstract description 13
- 238000005470 impregnation Methods 0.000 claims description 16
- 230000001070 adhesive effect Effects 0.000 claims description 10
- 238000004804 winding Methods 0.000 claims description 10
- 239000000853 adhesive Substances 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 239000003822 epoxy resin Substances 0.000 claims description 6
- 229920000647 polyepoxide Polymers 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 9
- 230000003064 anti-oxidating effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 10
- 239000002184 metal Substances 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 description 5
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003651 drinking water Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 235000012206 bottled water Nutrition 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002787 reinforcement Effects 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
- F16L9/16—Rigid pipes wound from sheets or strips, with or without reinforcement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/32—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core on a rotating mould, former or core
-
- 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
- F16L9/16—Rigid pipes wound from sheets or strips, with or without reinforcement
- F16L9/165—Rigid pipes wound from sheets or strips, with or without reinforcement of metal
Abstract
The invention discloses a kind of stainless steel belt composite pipe and preparation method thereof, described stainless steel belt composite material tube is complex as four-layer structure by different fiber glass materials, be followed successively by from inside to outside: first layer is the inner core that stainless steel belt is wound around, the second layer is the inside liner that fiberglass surfacing mat is wound in, third layer is glass fibre yarn, glass fiber cloth, the construction layer that glass fibre knitting felt is wound around, the 4th layer of protective layer being fiberglass surfacing mat and being wound around, bonding by binder between each layer, there is quality light, structural strength is high, Safety performance and the excellent feature of economic performance, enhance the anticorrosion of composite pipe, anti-oxidation ability.
Description
Technical field
The present invention relates to a kind of stainless steel belt composite pipe and preparation method thereof.
Background technique
Present various pipeline is widely used in the every field that people produce and live, and these pipes have metal tube, and as steel pipe, cast iron tube, copper pipe etc., also have pvc pipe, as being applied to running water pipe etc., also have composite pipe.Its structural strength of ferrous metal pipe is good, but perishable, construction is inconvenient, maintenance cost is high; Its structural strength of non-ferrous metal pipe is good, corrosion-resistant, but its cost is high, and construction cost is high.Pvc pipe is low with its cost, is lightly widely used, but its structural strength is poor, because of its caliber of restriction by manufacturing equipment all smaller.
Separately have China Patent No. to be the manufacture method that CN200510027483.5 discloses a kind of large-diameter wearproof anticorrosive composite pipe of glass fiber reinforced plastics, step is: a part of hot pressing of wire gaze tape thickness is gone to make compound strip to the ultra-high molecular weight polyethylene belt wide with it; Die core axle spiral winding is facing on this die core axle with one of ultra-high molecular weight polyethylene in compound strip; Bond is brushed to the wire gaze part on the surface that exposes outside, then fw frp on a wire mesh; Glass Steel Tube solidifies, and the die core axle demoulding, completes the manufacture of composite pipe.Adopt hot-press method that wire gaze and ultra-high molecular weight polyethylene are combined into one, adopt the method for brushing Bond that wire gaze and glass fibre reinforced plastics are combined into one, thus ultra-high molecular weight polyethylene and glass fibre reinforced plastics are bondd firmly blend together one layering, peeling can not occur again, and composite pipe manufactures diameter by the constraint that can not be greater than 1 meter.The shortcoming existed is that one, band of wire mesh energy consumption in heating process is high; Two, the band of wire mesh of heating is when with the pressing of ultra-high molecular weight polyethylene band, and its compression distance inequality can cause the bonding force of the frp layer be wound around with rear operation to decline; Three, preparation process is complicated.
China Patent No. is in addition: CN201120270902.9, disclose a kind of glass fiber reinforced plastic reinforced metal pipe model utility, comprise metal inner pipe and glass reinforced plastic sleeve, the external diameter of metal inner pipe is equal with the internal diameter of glass reinforced plastic sleeve, and glass reinforced plastic sleeve is sleeved on outside metal inner pipe.The shortcoming existed is that the diameter of one, metal tube and Glass Steel Tube all exists certain deviate, in cover process of assembling or assembling is difficult to be had certain damage to outer Glass Steel Tube, occur crackle, if having aggressive medium to internal layer corrosion failure; The effect that space does not have reinforcement is there is between the excessive bi-material of fitted position; Two, because belonging to two kinds of materials, it installs inconvenient.
Summary of the invention
In order to overcome the defect of above-mentioned prior art, the invention provides a kind of stainless steel belt composite pipe and preparation method thereof, it is light that stainless steel steel glass composite material tube of the present invention has quality, and structural strength is strong, improves anticorrosion, pollution-free, the anti-oxidation ability of composite pipe in using process; This preparation method is simple simultaneously, prepares material and is easy to get.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
A kind of stainless steel belt composite pipe; it is characterized in that: described stainless steel belt composite pipe is four-layer structure; be followed successively by from inside to outside: first layer is the inner core that stainless steel belt is wound around; the second layer is the inside liner that fiberglass surfacing mat is wound around; the construction layer that third layer is glass fiber yarn, glass fiber cloth, glass fibre knitting felt are wound around; the 4th layer of protective layer being fiberglass surfacing mat and being wound around, and bonding by binder between each layer.
The thickness of described inner core is 0.2mm-1mm, and the thickness of inside liner is 1-2mm, the thickness 6mm-20mm of construction layer, and the thickness of protective layer is 1mm-2mm.
A preparation method for stainless steel belt composite pipe, is characterized in that: comprise the following steps:
(1) on core, be wound around stainless steel belt, form inner core;
(2) to the surface coating binder of inner core;
(3) be wound around fiberglass surfacing mat at the inner cylindrical surface of coating binder, form inside liner;
(4) at the surface impregnation binder of inside liner;
(5) be wound around glass fiber yarn, glass fiber cloth, glass fibre knitting felt at the liner surface of impregnation adhesive, form construction layer;
(6) at the surface impregnation binder of construction layer;
(7) then at the construction layer surface wrap glass fiber surface felt of impregnation adhesive, and impregnation adhesive, form protective layer;
(8) normal temperature cure, stripping forming.
The cross winding angle of described stainless steel belt, fiberglass surfacing mat, glass fiber cloth, glass fibre knitting felt and glass Filament-wound Machine yarn is 52.5 °.
Described binder is epoxy resin.
The comb width that described fiberglass surfacing mat, glass fiber yarn, glass fiber cloth, glass fibre knitting felt are wound around is 150mm-200mm.
Stainless steel belt composite material tube of the present invention is mainly used in potable water conveying and other water delivery engineering.
Its feature: corrosion resistance is good; To water nonpollution; Material light specific gravity cost is low; The pipeline of all size can be prepared according to different working pressures; Easy for installation, be applicable to surface or buried-pipe laying.
The present invention has the following advantages:
1, stainless steel belt composite pipe of the present invention is four-layer structure; be followed successively by from inside to outside: first layer is the inner core that stainless steel belt is wound around; the second layer is the inside liner that fiberglass surfacing mat is wound around; the construction layer that third layer is glass fiber yarn, glass fiber cloth, glass fibre knitting felt are wound around; the 4th layer of protective layer being fiberglass surfacing mat and being wound around, and bonding by binder between each layer.Its structural strength is good, corrosion-resistant, material light specific gravity cost is low, can according to design, pressure rating, rigidity chain of command for all size multiple tube, easy construction, be applicable to surface and buried installation.As carry urban drinking water can not polluted water Security good.
2, the thickness of stainless steel belt composite pipe inner core of the present invention is 0.2mm-1mm; the thickness of inside liner is 0.5-2mm, the thickness 6mm-20mm of construction layer, can be wound to certain thickness according to pipeline pressure, rigidity; the thickness of protective layer is 1mm-2mm, to be applicable to different application area.
3, stainless steel belt composite material tube preparation process flow process of the present invention is simple and direct, and the preparation of stainless steel belt metal inner core can synchronously be carried out with glass fiber reinforced plastics composite material, shortens preparation time, improves working efficiency, minimizing material unaccounted-for (MUF).
4, stainless steel belt of the present invention, fiberglass surfacing mat, glass fiber yarn, glass fiber cloth, glass fibre thing needled mat cross winding angle are 52.5 ° of composite material densifications, mechanical property is good, intensity is high.
5, glass fiber winding comb width of the present invention is 150mm-200mm.Advantage: be to make lamination coating be affixed on each layer surface densely in winding process, and catch up with pure qi (oxygen) to steep.
6, binder of the present invention is epoxy resin, and mechanical property is high, adhesive property is excellent, cure shrinkage is little, good manufacturability, fire retardant are good, good stability, nontoxic to water nonpollution.
Accompanying drawing explanation
Fig. 1 is cross section structure schematic diagram of the present invention;
Fig. 2 is the A-A view of Fig. 1; (longitudinal section)
Fig. 3 is the schematic diagram using core in preparation method of the present invention;
Mark in figure: 1, inner core, 2, inside liner, 3, construction layer, 4, protective layer, 5, core.
Embodiment
Embodiment 1
Below in conjunction with accompanying drawing, the present invention is further illustrated:
As shown in Figure 1 and Figure 2; a kind of stainless steel belt composite pipe; described stainless steel belt composite pipe is composited by different fiber glass materials; its composite pipe is four-layer structure; be followed successively by from inside to outside: first layer is the inner core 1 that stainless steel belt is wound around; the second layer is the inside liner 2 that fiberglass surfacing mat is wound in; the construction layer 3 that third layer is glass fiber yarn, glass fiber cloth, needled mat are wound around; the 4th layer of protective layer 4 being fiberglass surfacing mat and being wound around, bonding by binder between each layer.
The thickness of described inner core 1 is 0.2mm-1mm, and the thickness of inside liner 2 is 1-2mm, and the thickness of construction layer 3 presses the thickness of different pressure rating windings, and be generally 6mm-20mm, the thickness of protective layer 4 is 1mm-2mm.
Embodiment 2
As shown in Figure 3; a kind of stainless steel belt composite pipe; described stainless steel belt composite pipe is composited by different fiber glass materials; its composite pipe is four-layer structure; be followed successively by from inside to outside: first layer is the inner core 1 that stainless steel belt is wound around; the second layer is the inside liner 2 that fiberglass surfacing mat is wound in, and the construction layer the 3, four layer that third layer is glass fiber yarn, glass fiber cloth, needled mat are wound around is the protective layer 4 that fiberglass surfacing mat is wound around.
The preparation method of above-mentioned stainless steel belt composite pipe, comprises the following steps:
(1) on core 5, be wound around stainless steel belt, form inner core 1;
(2) at the surface of the inner core 1 be wound around coating binder;
(3) at the surface wrap fiberglass surfacing mat of the inner core 1 of coating binder, form inside liner 2, be back and forth wound around as required in winding process, obtain required thickness;
(4) at the surface impregnation binder of inside liner 2, its binder (epoxy resin) content 65%--85%.
(5) at inside liner 2 surface wrap impregnation adhesive glass fiber yarn, the glass fiber cloth of impregnation adhesive, glass fibre knitting felt, forms construction layer; Back and forth be wound around as required in winding process, obtain required thickness; Its binder (epoxy resin) content reaches 25% ~ 35%.
(6) at the surface impregnation binder of construction layer;
(7) then at the construction layer surface wrap fiberglass surfacing mat of impregnation adhesive, and at its surface impregnation binder, protective layer is formed.Then solidify at normal temperatures, stripping forming.
The cross winding angle of the stainless steel belt used in the present invention, fiberglass surfacing mat, glass fiber cloth, glass fibre knitting felt and glass Filament-wound Machine yarn is 52.5 °.
Further, the binder used is epoxy resin, and the comb width that fiberglass surfacing mat used, glass fiber yarn, glass fiber cloth, glass fibre knitting felt are wound around is 150mm-200mm.
Claims (5)
1. a stainless steel belt composite pipe, it is characterized in that: described stainless steel belt composite pipe is four-layer structure, be followed successively by from inside to outside: first layer is the inner core that stainless steel belt is wound around, the second layer is the inside liner that fiberglass surfacing mat is wound around, the construction layer that third layer is glass fiber yarn, glass fiber cloth, glass fibre knitting felt are wound around, the 4th layer of protective layer being fiberglass surfacing mat and being wound around, and bonding by binder between each layer; The cross winding angle of described stainless steel belt, fiberglass surfacing mat, glass fiber cloth, glass fibre knitting felt and glass Filament-wound Machine yarn is 52.5 °.
2. stainless steel belt composite pipe according to claim 1, is characterized in that: the thickness of described inner core is 0.2mm-1mm, and the thickness of inside liner is 1-2mm, the thickness 6mm-20mm of construction layer, and the thickness of protective layer is 1mm-2mm.
3. the preparation method of a kind of stainless steel belt composite pipe according to claim 1, is characterized in that: comprise the following steps:
(1) on core, be wound around stainless steel belt, form inner core;
(2) to the surface coating binder of inner core;
(3) be wound around fiberglass surfacing mat at the inner cylindrical surface of coating binder, form inside liner;
(4) at the surface impregnation binder of inside liner;
(5) be wound around glass fiber yarn, glass fiber cloth, glass fibre knitting felt at the liner surface of impregnation adhesive, form construction layer;
(6) at the surface impregnation binder of construction layer;
(7) then at the construction layer surface wrap glass fiber surface felt of impregnation adhesive, and impregnation adhesive, form protective layer;
(8) normal temperature cure, stripping forming.
4. the preparation method of stainless steel belt composite pipe according to claim 3, is characterized in that: described binder is epoxy resin.
5. the preparation method of stainless steel belt composite pipe according to claim 3, is characterized in that: the comb width that described fiberglass surfacing mat, glass fiber yarn, glass fiber cloth, glass fibre knitting felt are wound around is 150mm-200mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410269104.2A CN104006229B (en) | 2014-06-17 | 2014-06-17 | A kind of stainless steel belt composite pipe and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410269104.2A CN104006229B (en) | 2014-06-17 | 2014-06-17 | A kind of stainless steel belt composite pipe and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104006229A CN104006229A (en) | 2014-08-27 |
| CN104006229B true CN104006229B (en) | 2016-02-17 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410269104.2A Active CN104006229B (en) | 2014-06-17 | 2014-06-17 | A kind of stainless steel belt composite pipe and preparation method thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN104006229B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102941676A (en) * | 2012-10-19 | 2013-02-27 | 湖北三江航天红阳机电有限公司 | Winding forming method for double-layer composite material of rotator |
| CN106051319A (en) * | 2016-08-19 | 2016-10-26 | 四川全丰新材料科技有限公司 | City utility tunnel and production method thereof |
| CN106564239B (en) * | 2016-10-31 | 2019-02-15 | 梁方德 | Metal and the corrosion-resistant composite structural member of composite material and preparation method thereof |
| CN106808720B (en) * | 2017-02-15 | 2019-06-25 | 浙江阮氏塑业有限公司 | A kind of processing technology of steel-belt-pipe |
| CN111055510A (en) * | 2018-10-16 | 2020-04-24 | 湖南易净环保科技有限公司 | Continuous knitting composite pulling and winding glass steel pipe and production method thereof |
| CN111572104A (en) * | 2020-05-29 | 2020-08-25 | 哈尔滨玻璃钢研究院有限公司 | Low-cost composite core pipe and manufacturing method thereof |
| CN114440051A (en) * | 2020-11-04 | 2022-05-06 | 中国石油化工股份有限公司 | Electrothermal repair method for glass steel tube |
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| CN203892740U (en) * | 2014-06-17 | 2014-10-22 | 四川全丰玻璃钢科技有限公司 | Stainless steel belt composite pipe |
-
2014
- 2014-06-17 CN CN201410269104.2A patent/CN104006229B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4214932A (en) * | 1979-05-17 | 1980-07-29 | Exxon Research & Engineering Co. | Method for making composite tubular elements |
| CN2412141Y (en) * | 1999-11-26 | 2000-12-27 | 侯贤忠 | Thermal insulating layer structure of glass fiber reinforced plastic carbon steel pipe and stainless steel composite pipeline |
| DE10337123A1 (en) * | 2003-08-11 | 2005-03-17 | Westfalia Metallschlauchtechnik Gmbh & Co. Kg | Connection element for pipe lines subjected to vibration stress, e.g. exhaust gas pipes in IC engines consists of elastic hollow-cylindrical sleeve of ceramic material fitted into hose for gas-proof connection |
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| CN104006229A (en) | 2014-08-27 |
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Denomination of invention: Stainless steel belt composite pipe and manufacturing method thereof Effective date of registration: 20170210 Granted publication date: 20160217 Pledgee: The Great Wall West Bank Bank of China Deyang hi tech branch Pledgor: SICHUAN QUANFENG NEW MATERIALS AND TECHNOLOGY CO.,LTD. Registration number: 2017990000094 |
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Denomination of invention: Stainless steel belt composite pipe and manufacturing method thereof Effective date of registration: 20180403 Granted publication date: 20160217 Pledgee: The Great Wall West Bank Bank of China Deyang hi tech branch Pledgor: SICHUAN QUANFENG NEW MATERIALS AND TECHNOLOGY CO.,LTD. Registration number: 2018510000037 |
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Denomination of invention: A stainless steel strip composite pipe and its preparation method Effective date of registration: 20230926 Granted publication date: 20160217 Pledgee: The Great Wall West Bank Bank of China Deyang hi tech branch Pledgor: SICHUAN QUANFENG NEW MATERIALS AND TECHNOLOGY CO.,LTD. Registration number: Y2023980059052 |
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