CN108758102B - 3PE anti-corrosion production line and anti-corrosion process for outer surface of steel pipe - Google Patents
3PE anti-corrosion production line and anti-corrosion process for outer surface of steel pipe Download PDFInfo
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- CN108758102B CN108758102B CN201810409768.2A CN201810409768A CN108758102B CN 108758102 B CN108758102 B CN 108758102B CN 201810409768 A CN201810409768 A CN 201810409768A CN 108758102 B CN108758102 B CN 108758102B
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- 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
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
- B05D7/146—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies to metallic pipes or tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
- B24C1/086—Descaling; Removing coating films
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/78—Pretreatment of the material to be coated
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- 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
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- 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
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
- F16L58/1063—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe the coating being a sheet wrapped around the pipe
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2504/00—Epoxy polymers
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
- C23C2222/20—Use of solutions containing silanes
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- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
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- Materials Engineering (AREA)
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Abstract
The invention discloses a 3PE (polyethylene) anticorrosion production line and an anticorrosion process for the outer surface of a steel pipe. The invention solves the pollution problem of the existing production line and process in the corrosion prevention of the welded pipe 3PE, so that the silane film successfully replaces the phosphoric acid passivation film, and the corrosion prevention effect is good.
Description
The technical field is as follows:
the invention belongs to the technical field of welded steel pipe manufacturing, and particularly relates to a continuous production 3PE anti-corrosion production line and an anti-corrosion process for the outer surface of a steel pipe.
Technical background:
most of the existing 3PE steel pipe anticorrosion production lines adopt intermediate-frequency preheating, shot blasting, rust removal, dust treatment and other modes for pretreatment before coating, so that the anchor line depth and cleanliness grade of the surface of the steel pipe before coating are achieved, and the quality of a steel pipe anticorrosion layer is further ensured. Although the process layout is used all the time and almost all domestic pipe factories adopt the mode, how to further improve the test indexes such as the cathode peeling strength and the like, prolong the service life of the steel pipe and reduce the environmental pollution in the corrosion prevention process of the steel pipe cannot be realized by the existing process conditions. Therefore, the existing process needs to be improved, the coating quality of the steel pipe is ensured by adding the processes of flame combustion, alkali liquor cleaning, water cleaning silane passivation treatment and the like, and the service life of the steel pipe is prolonged;
the invention content is as follows:
the technical problems solved by the invention are as follows: the anti-corrosion production line and the anti-corrosion process for the 3PE on the outer surface of the steel pipe meet the requirements of the 3PE anti-corrosion production of the welded steel pipe.
The technical scheme adopted by the invention is as follows: the utility model provides a anticorrosive production line of steel pipe surface 3PE, by the flame preheater, throw ball deruster, in-pipe sweep device, intermediate frequency heating furnace I, alkali lye purge chamber, high pressure water purge chamber, silane passivation room, stoving curing chamber, intermediate frequency heating furnace II, epoxy powder spraying device, adhesive and polyethylene cladding forming device, spray water cooling device, electric spark leak hunting device, pipe end grinding device that arrange in proper order constitute.
A3 PE anticorrosion process for an outer surface of a steel pipe comprises the following process steps:
(1) preheating: preheating the welded steel pipe by a flame preheating furnace, and simultaneously burning off grease on the surface of the steel pipe;
(2) shot blasting: derusting the outer surface of the preheated steel pipe by using a shot blasting derusting machine to ensure that the cleanliness of the surface of the steel pipe reaches the Sa2.5-grade requirement specified in GB/T8923 and the anchor line depth reaches 50-90 mu m;
(3) purging: after the outer surface is derusted, the steel pipe is subjected to blowing and recovering on steel grit and steel shots on the inner wall of the steel pipe through an in-pipe blowing device, so that impurities do not exist on the inner wall of the pipe body;
(4) preheating: heating the steel pipe with the outer surface subjected to rust removal and the inner wall subjected to purging to 50-70 ℃ through a medium-frequency heating furnace I to meet the process temperature of alkali liquor cleaning and silane reaction;
(5) washing with alkali liquor: cleaning the outer surface of the steel pipe which is derusted and preheated by alkali liquor in an alkali liquor cleaning chamber, wherein the temperature of the alkali liquor is controlled to be 60 +/-5 ℃, and cleaning oil stains on the surface of the steel pipe;
(6) water cleaning: continuously cleaning the pipe body by using high-pressure water of 7-20 MPa through a high-pressure water cleaning chamber, and controlling the pH value of the surface of the steel pipe to be 7-9;
(7) and (3) silane passivation: carrying out silane passivation treatment on the pipe body by the steel pipe subjected to acid washing and water washing through a silane passivation chamber;
(8) and (3) curing: heating the steel pipe subjected to silane passivation treatment to 100 +/-5 ℃ through a drying and curing chamber, and curing for 20-30 min;
(9) heating: heating the cured steel pipe to 180-220 ℃ through a medium-frequency heating furnace II;
(10) spraying epoxy powder: spraying epoxy powder on the outer surface of the heated steel pipe through an epoxy powder spraying device;
(11) coating with an adhesive and polyethylene: sequentially coating an adhesive layer and a polyethylene layer on the outer surface of the pipe body of the epoxy sprayed steel pipe through an adhesive and polyethylene coating forming device;
(12) water cooling: continuously cooling the coated welded pipe by the online spraying mode through a spraying water cooling device to cool the anticorrosive layer of the pipe body, improving the coating strength of the coating and the pipe body, and simultaneously cooling the coating to below 60 ℃;
(13) and (3) leak detection of the anticorrosive coating: carrying out online continuous leak detection on the anticorrosive coating of the cooled steel pipe by an electric spark leak detection device;
(14) end beating: and (4) grinding the anticorrosive coating at the end part of the welded steel pipe into a chamfer angle of less than or equal to 30 degrees by using the steel pipe qualified by inspection through a pipe end grinding device.
Compared with the prior art, the invention has the advantages and effects that:
1. aiming at the problem that the abrasive in the shot blasting rust remover is polluted by oil stain, salt and dust particles on the surface of the existing welded steel pipe, the surface of the steel pipe is preheated by flame combustion before shot blasting rust removal of the welded steel pipe, and the pollutants are cleaned from the surface of the steel pipe.
2. The invention adopts alkali liquor cleaning and water washing to thoroughly clean the pollutants from the surface of the steel pipe aiming at dust particles in the anchor lines on the surface of the steel pipe after shot blasting and rust removal and dust overflowing from the steel pipe.
3. According to the invention, before epoxy powder is sprayed, a layer of anticorrosive silane film is produced on the surface of the welded steel pipe through silane passivation, and the silane film on the surface of the steel pipe is cured through a drying and curing furnace, so that the surface of the steel pipe is dried and cleaned before epoxy spraying.
Description of the drawings:
the technical scheme of the invention is further explained in detail in the following with the accompanying drawings.
FIG. 1 is a schematic view of a production line according to the present invention;
FIG. 2 is a schematic structural diagram of a 3PE anticorrosive layer according to the present invention.
The specific implementation mode is as follows:
an embodiment of the present invention is described below with reference to fig. 1 and 2.
The utility model provides a anticorrosive production line of steel pipe surface 3PE which characterized in that: all production lines are composed of a flame preheating furnace 1, a shot blasting rust remover 2, an in-pipe purging device 3, an intermediate frequency heating furnace I4, an alkali liquor cleaning chamber 5, a high-pressure water cleaning chamber 6, a silane passivation chamber 7, a drying and curing chamber 8, an intermediate frequency heating furnace II 9, an epoxy powder spraying device 10, an adhesive and polyethylene coating forming device 11, a spray water cooling device 12, an electric spark leakage detecting device 13 and a pipe end polishing device 14 which are sequentially arranged.
A3 PE anticorrosion process for an outer surface of a steel pipe is characterized by comprising the following process steps:
(1) preheating: preheating the welded steel pipe through a flame preheating furnace 1, and simultaneously burning away grease on the surface of the steel pipe;
(2) shot blasting: derusting the outer surface of the preheated steel pipe by using a shot blasting derusting machine 2, so that the cleanliness of the surface of the steel pipe can meet the requirement of Sa2.5 grade specified in GB/T8923, and the anchor mark depth can reach 50-90 mu m;
(3) purging: after the outer surface is derusted, the steel pipe is subjected to blowing and recovering on steel grit and steel shots on the inner wall of the steel pipe through an in-pipe blowing device 3, so that impurities do not exist on the inner wall of the pipe body;
(4) preheating: heating the steel pipe with the outer surface subjected to rust removal and the inner wall subjected to purging to 50-70 ℃ through a medium-frequency heating furnace I4 to meet the process temperature of alkali liquor cleaning and silane reaction;
(5) washing with alkali liquor: cleaning the steel pipe with rust removed on the outer surface and preheated by alkali liquor cleaning chamber 5, controlling the temperature of alkali liquor at 60 +/-5 ℃, and cleaning oil stains on the surface of the steel pipe;
(6) water cleaning: continuously cleaning the tube body with high-pressure water of 7-20 MPa by the aid of the high-pressure water cleaning chamber 6 after the alkali cleaning, and controlling the pH value of the surface of the steel tube to be 7-9 after inspection;
(7) and (3) silane passivation: carrying out silane passivation treatment on the steel pipe subjected to acid washing and water washing through a silane passivation chamber 7;
(8) and (3) curing: heating the steel pipe subjected to silane passivation treatment to 100 +/-5 ℃ through a drying and curing chamber 8, and curing for 20-30 min;
(9) heating: heating the cured steel pipe to 180-220 ℃ through a medium-frequency heating furnace II 9;
(10) spraying epoxy powder: spraying epoxy powder on the outer surface of the heated steel pipe through an epoxy powder spraying device 10;
(11) coating with an adhesive and polyethylene: the steel pipe sprayed with the epoxy is sequentially coated with an adhesive layer and a polyethylene layer on the outer surface of the pipe body through an adhesive and polyethylene coating forming device 11;
(12) water cooling: continuously cooling the coated welded pipe by the spray water cooling device 12 in an online spraying manner to cool the anticorrosive layer of the pipe body, improving the coating strength of the coating and the pipe body, and simultaneously cooling the coating to below 60 ℃;
(13) and (3) leak detection of the anticorrosive coating: carrying out online continuous leak detection on the anticorrosive coating of the cooled steel pipe by an electric spark leak detection device 13;
(14) end beating: and (3) grinding the pipe end anticorrosive layer to form a chamfer angle of less than or equal to 30 degrees on the steel pipe qualified by inspection through the pipe end grinding device 14.
The welding steel pipe passes through a flame preheating furnace I1, a shot blasting rust remover I2, an in-pipe purging device 3, an intermediate frequency heating furnace I4, an alkali liquor cleaning chamber 5, a high-pressure water cleaning chamber 6, a silane passivation chamber 7, a drying and curing chamber 8, an intermediate frequency heating furnace II 9, an epoxy powder spraying device 10, an adhesive and polyethylene coating forming device 11, a spray water cooling device 12, an electric spark leakage detecting device 13 and a pipe end polishing device 14 in sequence after being on line.
The 3PE anticorrosive layer is composed of a silane passivation film layer 16 coated on the surface of the welded steel pipe 15, an epoxy resin layer 17 coated on the surface of the silane passivation film layer, an adhesive layer 18 and an outermost polyethylene layer 19.
The above-mentioned embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the scope of the invention, and therefore all equivalent variations made by the following claims should be included in the scope of the invention.
Claims (1)
1. The anti-corrosion process based on the steel pipe outer surface 3PE production line is characterized in that:
the production line consists of a flame preheating furnace ⑴, a shot blasting rust remover ⑵, an in-pipe purging device ⑶, an intermediate frequency heating furnace I ⑷, an alkali liquor cleaning chamber ⑸, a high-pressure water cleaning chamber ⑹, a silane passivation chamber ⑺, a drying and curing chamber ⑻, an intermediate frequency heating furnace II ⑼, an epoxy powder spraying device ⑽, an adhesive and polyethylene coating forming device ⑵ 0, a spray water cooling device ⑵ 1, an electric spark leakage detecting device ⑵ 2 and a pipe end grinding device ⑵ 3 which are sequentially arranged;
after the steel pipe is on-line, sequentially carrying out preheating, shot blasting, blowing, preheating, alkali liquor cleaning, water cleaning, silane passivation, curing, heating, epoxy powder spraying, adhesive and polyethylene coating, water cooling, leakage detection and end-beating on the steel pipe to obtain a finished product, and delivering the finished product to a warehouse;
the method comprises the following process steps:
preheating, namely preheating the welded steel pipe by a flame preheating furnace ⑴, and simultaneously burning grease on the surface of the steel pipe by flame;
performing shot blasting, namely derusting the outer surface of the preheated steel pipe through a shot blasting deruster ⑵ to ensure that the cleanliness of the surface of the steel pipe reaches the Sa2.5-level requirement specified in GB/T8923 and the anchor line depth reaches 50-90 m;
purging, namely, purging and recovering the steel sand and the steel shots on the inner wall of the steel pipe through an in-pipe purging device ⑶ after the outer surface of the steel pipe is derusted, so that impurities do not exist on the inner wall of the pipe body;
preheating, namely heating the steel pipe with the outer surface subjected to rust removal and the inner wall subjected to blowing sweeping to 50-70 ℃ through an intermediate frequency heating furnace I ⑷ to meet the process temperature of alkali liquor cleaning and silane reaction;
alkali liquor cleaning, namely performing alkali liquor cleaning on the steel pipe body through the preheated steel pipe with the outer surface subjected to rust removal by an alkali liquor cleaning chamber ⑸, controlling the temperature of the alkali liquor to be 60 +/-5 ℃, and cleaning oil stains on the surface of the steel pipe;
water cleaning, namely continuously cleaning the pipe body by using high-pressure water of 7-20 MPa through the high-pressure water cleaning chamber ⑹ on the steel pipe after alkali cleaning, and controlling the pH value of the surface of the steel pipe to be 7-9;
performing silane passivation, namely performing silane passivation treatment on the steel pipe body through a silane passivation chamber ⑺ after acid washing and water washing, wherein after the welded steel pipe passes through a silane passivation chamber ⑺, the welded steel pipe needs to be cured for 20-30 min at the process temperature of 100 ℃, and a corrosion-resistant passivation film is generated on the surface of the steel pipe;
curing, namely heating the whole steel pipe subjected to silane passivation treatment to 100 +/-5 ℃ through a drying and curing chamber ⑻, and curing for 20-30 min;
heating, namely heating the cured steel pipe to 180-220 ℃ through an intermediate frequency heating furnace II ⑼;
spraying epoxy powder, namely spraying the epoxy powder on the outer surface of the heated steel pipe through an epoxy powder spraying device ⑽;
coating the steel pipe with the epoxy coating by using an adhesive and polyethylene coating forming device ⑾, wherein the outer surface of the steel pipe is coated with an adhesive layer and a polyethylene layer in sequence;
water cooling, namely continuously cooling the coated welded pipe through a spray water cooling device ⑿ in an online spray mode to cool the anticorrosive coating of the pipe body, so as to improve the coating strength of the coating and the pipe body and simultaneously cool the coating to below 60 ℃;
leak detection of the anticorrosive coating, namely carrying out online continuous leak detection on the anticorrosive coating by the cooled steel pipe through an electric spark leak detection device ⒀;
end polishing, namely polishing the anti-corrosion layer of the pipe end to form a chamfer angle of less than or equal to 30 degrees by the steel pipe which is qualified through inspection through a pipe end polishing device ⒁;
the process speeds of the alkali liquor cleaning chamber ⑸, the high-pressure water cleaning chamber ⑹ and the silane passivation chamber ⑺ are consistent;
the production speed of the drying and curing chamber ⑻ is consistent with the speed of the adhesive and polyethylene coating and forming device ⑾;
when the welded steel pipe passes through the high-pressure water cleaning chamber ⑻, the temperature of cleaning water is 60 +/-5 ℃, the water pressure is 7-20 MPa, and the PH value of the surface of the cleaned steel pipe is 7-9;
when the welded steel pipe passes through the alkali liquor cleaning chamber ⑸, the temperature of the surface of the steel pipe is kept consistent with that of the alkali liquor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810409768.2A CN108758102B (en) | 2018-05-02 | 2018-05-02 | 3PE anti-corrosion production line and anti-corrosion process for outer surface of steel pipe |
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| CN201810409768.2A CN108758102B (en) | 2018-05-02 | 2018-05-02 | 3PE anti-corrosion production line and anti-corrosion process for outer surface of steel pipe |
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| CN108758102B true CN108758102B (en) | 2020-06-23 |
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| CN102797928A (en) * | 2012-07-28 | 2012-11-28 | 广东联塑科技实业有限公司 | Production technology of internal/external plastic-coated composite pipe and internal/external plastic-coated composite pipe |
| CN103016906A (en) * | 2012-12-25 | 2013-04-03 | 宝鸡石油钢管有限责任公司 | Outer surface 3PE anti-corrosion production line for continuous pipe and anti-corrosion process |
| CN107377337A (en) * | 2017-06-22 | 2017-11-24 | 陕西宇阳石油科技工程有限公司 | Epoxy powder coating process inside and outside a kind of steel pipe |
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