CN110000238B - Method for producing steel pipe - Google Patents
Method for producing steel pipe Download PDFInfo
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- CN110000238B CN110000238B CN201910254027.6A CN201910254027A CN110000238B CN 110000238 B CN110000238 B CN 110000238B CN 201910254027 A CN201910254027 A CN 201910254027A CN 110000238 B CN110000238 B CN 110000238B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
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- 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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
- B29C65/52—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive
-
- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/03—After-treatments in the joint area
- B29C66/032—Mechanical after-treatments
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/52—Joining tubular articles, bars or profiled elements
- B29C66/522—Joining tubular articles
- B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/74—Joining plastics material to non-plastics material
- B29C66/742—Joining plastics material to non-plastics material to metals or their alloys
- B29C66/7428—Transition metals or their alloys
- B29C66/74283—Iron or alloys of iron, e.g. steel
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/42—Induction heating
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
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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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/088—Iron or steel solutions containing organic acids
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/04—Apparatus for cleaning or pickling metallic material for cleaning pipes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Inorganic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention discloses a production method of a steel pipe, which relates to the technical field of steel pipe production and solves the problem that wrinkles are easy to appear on the inner side of a plastic pipe in the existing plastic-lined steel pipe, and the technical scheme is characterized by comprising the following steps: a. selecting materials and shearing plates; b. cold rolling and forming; c. welding the pipe seam; d. processing a welding seam; e. detecting a welding seam; f. heat treatment; g. coating hot melt adhesive; h. pressurizing and sealing the pipe; i. heating; j. exhausting; when heating the steel pipe, the inner wall of polyethylene pipe is cooled down through the mode that sprays the water smoke to make the inner wall of polyethylene pipe be difficult to appear the phenomenon of softening, thereby be difficult to appear flowing, thereby be difficult to the phenomenon of fold appearing on making the inner wall of polyethylene pipe.
Description
Technical Field
The invention relates to the technical field of steel pipe production, in particular to a production method of a steel pipe.
Background
The lining plastic steel pipe is one of steel pipes, most of galvanized seamless steel pipes or welded steel pipes are used as base pipes when the lining plastic steel pipe is produced, after welding ribs on the inner wall of the steel pipe are removed, food-grade polyethylene pipes with the same inner diameter as the steel pipe are lined on the inner wall of the steel pipe, then the polyethylene pipes are bonded on the inner wall of the steel pipe in a pressurizing and heating mode for a certain time, and the lining plastic steel pipe is an upgrading product of the existing steel pipe.
When carrying out lining plastic steel pipe production, need coat the one deck hot melt adhesive on the outer wall of present polyethylene pipe, the melting point of hot melt adhesive is 120 ℃, the melting point of polyethylene is about 120 ℃ -125 ℃, the melting point and the softening point of hot melt adhesive and polyethylene are all more close, present lining plastic steel pipe is producing mostly to adopt electromagnetic induction heating technique in the middle of carrying out the production process, but when the inner wall of steel pipe is heated to the temperature that the hot melt adhesive melts, the phenomenon that the polyethylene pipe also can appear softening because of the heating, this also makes the polyethylene pipe flow because of pressure easily, thereby make the phenomenon of fold appear on the inner wall of plastic tubing, influence the production quality of lining plastic steel pipe.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a production method of a steel pipe, which is characterized in that when the steel pipe is heated, the inner wall of a polyethylene pipe is cooled in a water mist spraying mode, so that the inner wall of the polyethylene pipe is not easy to soften, flow and wrinkle when the inner wall of the polyethylene pipe is not easy to wrinkle.
In order to achieve the purpose, the invention provides the following technical scheme: a method of producing a steel pipe comprising the steps of:
a. selecting materials and shearing plates: selecting proper steel according to the requirements of the steel pipe to be produced, then rolling the selected steel into a coiled plate in a hot rolling mode, and then cutting the hot-rolled coiled plate into proper size according to the size of the steel to be produced by using a shear to be built;
b. cold rolling and forming: feeding the steel plate cut into a specified size into a roller type forming machine for rolling, and rolling the steel strip by 360 degrees to form a blank steel pipe;
c. and (3) welding the pipe seam: welding the joint of the pickled blank steel pipe by using high-frequency welding equipment;
d. welding seam treatment: after welding, welding seams and welding slag are left on the inner side and the outer side of the steel pipe, and in order to ensure the flatness of the inner surface and the outer surface of the steel pipe, arc-shaped scrapers are needed to clean the welding slag at the welding seams and to enable the welding seams to be more smooth;
e. and (3) detecting a welding seam: the steel pipe after the welding seam treatment is sent into an eddy current flaw detector for flaw detection, pipe cutting and sampling are needed at any time in the production process, and then flattening testing is carried out on the welding seam of the sample, so that the production quality is ensured;
f. and (3) heat treatment: the steel pipe is sent into a heating furnace for heat treatment, when the heating furnace is used for heating, the normal temperature is firstly heated to 300 ℃, the heating time is controlled to be 10-15 min, then the temperature of the heating furnace is heated to 600 ℃ from 300 ℃, the heating time is 1-1.5 min, then the temperature of the heating furnace is heated to 900 ℃ from 600 ℃, the heating time is 9-10 min, and finally the temperature of the heating furnace is heated to 1150 ℃ from 900 ℃, and the heating time is 6-7 min;
g. coating hot melt adhesive: selecting a polyethylene pipe with the outer diameter equal to the inner diameter of the steel pipe, and then uniformly coating a layer of hot melt adhesive on the outer side of the polyethylene pipe;
h. pressurizing and sealing the pipe: inserting a polyethylene pipe into the steel pipe to enable the outer side of the polyethylene pipe to be in contact with the inner side of the steel pipe, then arranging a spraying device on the inner side of the polyethylene pipe, sealing two ends of the polyethylene pipe, and then pressurizing the inner side of the polyethylene pipe to enable the outer side of the polyethylene pipe to be only attached to the steel pipe;
i. heating: heating the steel pipe by the induction heating ring, spraying water mist to the inner side of the polyethylene pipe by a spraying device during the heating process of the steel pipe, and heating the steel pipe by the heating ring until the hot melt adhesive is melted;
j. exhausting: after the hot melt adhesive is melted, and the steel pipe and the polyethylene pipe are fully cooled, the gas in the polyethylene pipe is discharged, and the production of the steel pipe is completed.
Through adopting above-mentioned technical scheme, when heating the steel pipe, spray water smoke on to the inner wall of polyethylene pipe by spray set to make the inner wall department temperature of polyethylene pipe be less than the temperature of polyethylene tub of outer wall, thereby make the inner wall of polyethylene pipe be difficult to appear softening the problem that flows, thereby make the inner wall of polyethylene pipe be difficult to appear flowing problem, thereby be difficult to form the fold because of flowing on making the inner wall of polyethylene pipe.
The invention is further configured to: and b, spraying lubricating oil on the surface of the steel strip in the process of rolling the steel strip by using the roller type forming machine.
Through adopting above-mentioned technical scheme, can make the surface of steel band more smooth through spraying lubricating oil, prevent that the steel band from the problem that the fold appears because frictional force is great in the middle of the process of carrying out the rolling.
The invention is further configured to: in the step b, after the rolling of the blank steel pipe is completed, the lubricating oil on the blank steel pipe needs to be cleaned.
Through adopting above-mentioned technical scheme, get rid of the lubricating oil of adhesion on the blank steel pipe surface earlier to make the blank steel pipe when carrying out the welding, can not lead to welding to appear the quality problem because of the existence of lubricating oil.
The invention is further configured to: in the step b, when the lubricating oil on the blank steel pipe is cleaned, carbon tetrachloride is sprayed to the inner surface and the outer surface of the blank steel pipe, after the carbon tetrachloride is left on the surface of the steel pipe for five minutes, the surface of the blank steel pipe is washed clean by water, and then the surface of the steel pipe is dried by high-pressure gas.
Through adopting above-mentioned technical scheme, lubricating oil can be dissolved in the middle of the carbon tetrachloride, can wash the steel pipe lubricating oil on the surface totally through washing of carbon tetrachloride, then can make carbon tetrachloride give the sanitization with steel pipe surface mountain through water, later weather the surface of steel pipe through high-pressure gas for the surface of steel pipe is in the dry state, can not cause the influence to subsequent processing.
The invention is further configured to: and c, before the seam welding of the pipe, pickling is carried out on the blank steel pipe, and the maintenance layer on the surface of the blank steel pipe is removed.
Through adopting above-mentioned technical scheme, through carrying out the pickling, can clear away the oxide layer on steel pipe surface to make the steel pipe when carrying out the welding, because do not have the oxide layer, thereby can improve welded quality.
The invention is further configured to: in the step c, when acid washing is carried out, firstly, the acid solution is heated by a heating furnace, the heating temperature of the acid solution is 20-60 ℃, and then the heated acid solution is used for washing the surface of the blank steel pipe.
Through adopting above-mentioned technical scheme, heat the acid solution earlier for the temperature of acid solution risees, along with the increase of temperature, can improve the speed of acid and oxide layer reaction, thereby has improved the speed of pickling.
The invention is further configured to: in the step c, when the blank steel pipe is washed, firstly, nitric acid with the concentration of 6 g/L-7 g/L is used for washing for 40 min-50 min, then hydrofluoric acid with the concentration of 8 g/L-9 g/L is used for washing for 10 min-15 min, finally, sodium citrate with the concentration of 2 g/L-4 g/L is used for washing for 45 min-50 min, after the acid washing is finished, the surface of the blank steel pipe is cleaned by clear water, and then the surface of the steel pipe is dried by high-pressure gas.
By adopting the technical scheme, different acid solutions are used for pickling the blank steel pipe for three times, so that the pickling effect and speed can be improved.
The invention is further configured to: and in the step i, spraying water mist at intervals of 2-5 s.
Through adopting above-mentioned technical scheme, the hot melt adhesive that causes the polyethylene pipe outside easily that sprays that carries out water smoke always also can not reach the temperature that melts, and the mode that sprays through the interval can enough cool down the inboard of polyethylene pipe, prevents that it from reaching the temperature of softening, still can not lead to the fact the influence to melting of hot melt adhesive.
In summary, compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the spraying device is arranged to spray water mist on the inner wall of the polyethylene pipe during heating, so that the inner wall of the polyethylene pipe is not easy to soften, and thus the polyethylene pipe is not easy to flow, and the inner wall of the polyethylene pipe is not easy to wrinkle;
2. according to the invention, the water mist is set to be sprayed at intervals, so that the inner side of the polyethylene pipe can be cooled to prevent the polyethylene pipe from reaching the softening temperature, and the melting of the hot melt adhesive is not influenced.
Detailed Description
The first embodiment is as follows: a method of producing a steel pipe comprising the steps of:
a. selecting materials and shearing plates: selecting proper steel according to the requirements of the steel pipe to be produced, then rolling the selected steel into a coiled plate in a hot rolling mode, and then cutting the hot-rolled coiled plate into proper size according to the size of the steel to be produced by using a shear to be built;
b. cold rolling and forming: feeding the steel plate cut into a specified size into a roller type forming machine for rolling, and rolling the steel strip by 360 degrees to form a blank steel pipe; the method has the advantages that lubricating oil is sprayed on the surface of the steel strip in the process of rolling the steel strip by using the roller type forming machine, so that the problem that the surface of the steel strip is wrinkled due to large friction force in the process of rolling is solved;
c. deoiling: spraying carbon tetrachloride on the inner surface and the outer surface of the blank steel pipe, keeping the carbon tetrachloride on the surface of the steel pipe for five minutes, washing the surface of the blank steel pipe with water, and drying the surface of the steel pipe with high-pressure gas;
d. acid washing: pickling a blank steel pipe to remove an oxide layer on the surface of the blank steel pipe, firstly heating an acid solution by a heating furnace, heating the acid solution by 20 ℃, then washing the surface of the blank steel pipe by using the heated acid solution, washing the surface of the blank steel pipe for three times during washing, firstly washing the surface of the blank steel pipe for 40min by using nitric acid with the concentration of 6g/L, then washing the surface of the blank steel pipe for 10min by using hydrofluoric acid with the concentration of 8g/L, finally washing the surface of the blank steel pipe for 45min by using sodium citrate with the concentration of 2g/L, cleaning the surface of the blank steel pipe by using clear water after pickling is finished, and then blowing the surface of the steel pipe by;
e. and (3) welding the pipe seam: welding the joint of the pickled blank steel pipe by using high-frequency welding equipment;
f. welding seam treatment: after welding, welding seams and welding slag are left on the inner side and the outer side of the steel pipe, and in order to ensure the flatness of the inner surface and the outer surface of the steel pipe, arc-shaped scrapers are needed to clean the welding slag at the welding seams and to enable the welding seams to be more smooth;
g. and (3) detecting a welding seam: the steel pipe after the welding seam treatment is sent into an eddy current flaw detector for flaw detection, pipe cutting and sampling are needed at any time in the production process, and then flattening testing is carried out on the welding seam of the sample, so that the production quality is ensured;
h. and (3) heat treatment: the steel pipe is sent into a heating furnace for heat treatment, the heating time of the heating furnace is controlled within 10min from the normal temperature of 300 ℃ when the heating furnace is heated, then the temperature of the heating furnace is heated from 300 ℃ to 600 ℃ for 1min, then the temperature of the heating furnace is heated from 600 ℃ to 900 ℃ for 9min, and finally the temperature of the heating furnace is heated from 900 ℃ to 1150 ℃ for 6 min;
i. coating hot melt adhesive: selecting a polyethylene pipe with the outer diameter equal to the inner diameter of the steel pipe, and then uniformly coating a layer of hot melt adhesive on the outer side of the polyethylene pipe;
j. pressurizing and sealing the pipe: inserting a polyethylene pipe into the steel pipe to enable the outer side of the polyethylene pipe to be in contact with the inner side of the steel pipe, then arranging a spraying device on the inner side of the polyethylene pipe, sealing two ends of the polyethylene pipe, and then pressurizing the inner side of the polyethylene pipe to enable the outer side of the polyethylene pipe to be only attached to the steel pipe;
k. heating: heating the steel pipe by the induction heating ring, spraying water mist to the inner side of the polyethylene pipe by a spraying device during the heating process of the steel pipe, wherein the spraying of the water mist is performed at intervals, the spraying is performed every 2, and the heating ring heats the steel pipe until the hot melt adhesive is melted;
l, exhausting: after the hot melt adhesive is melted, and the steel pipe and the polyethylene pipe are fully cooled, the gas in the polyethylene pipe is discharged, and the production of the steel pipe is completed.
Example two: a method of producing a steel pipe comprising the steps of:
a. selecting materials and shearing plates: selecting proper steel according to the requirements of the steel pipe to be produced, then rolling the selected steel into a coiled plate in a hot rolling mode, and then cutting the hot-rolled coiled plate into proper size according to the size of the steel to be produced by using a shear to be built;
b. cold rolling and forming: feeding the steel plate cut into a specified size into a roller type forming machine for rolling, and rolling the steel strip by 360 degrees to form a blank steel pipe; the method has the advantages that lubricating oil is sprayed on the surface of the steel strip in the process of rolling the steel strip by using the roller type forming machine, so that the problem that the surface of the steel strip is wrinkled due to large friction force in the process of rolling is solved;
c. deoiling: spraying carbon tetrachloride on the inner surface and the outer surface of the blank steel pipe, keeping the carbon tetrachloride on the surface of the steel pipe for five minutes, washing the surface of the blank steel pipe with water, and drying the surface of the steel pipe with high-pressure gas;
d. acid washing: pickling a blank steel pipe to remove an oxide layer on the surface of the blank steel pipe, firstly heating an acid solution by a heating furnace, heating the acid solution to 40 ℃, then washing the surface of the blank steel pipe by using the heated acid solution, washing the surface of the blank steel pipe for three times during washing, firstly washing the surface of the blank steel pipe for 45min by using nitric acid with the concentration of 6.5g/L, then washing the surface of the blank steel pipe for 12.5min by using hydrofluoric acid with the concentration of 8.5g/L, finally washing the surface of the blank steel pipe for 47.5min by using sodium citrate with the concentration of 3g/L, washing the surface of the blank steel pipe clean by using clear water after pickling is finished, and then drying the surface of the steel pipe;
e. and (3) welding the pipe seam: welding the joint of the pickled blank steel pipe by using high-frequency welding equipment;
f. welding seam treatment: after welding, welding seams and welding slag are left on the inner side and the outer side of the steel pipe, and in order to ensure the flatness of the inner surface and the outer surface of the steel pipe, arc-shaped scrapers are needed to clean the welding slag at the welding seams and to enable the welding seams to be more smooth;
g. and (3) detecting a welding seam: the steel pipe after the welding seam treatment is sent into an eddy current flaw detector for flaw detection, pipe cutting and sampling are needed at any time in the production process, and then flattening testing is carried out on the welding seam of the sample, so that the production quality is ensured;
h. and (3) heat treatment: the steel pipe is sent into a heating furnace for heat treatment, when the heating furnace is used for heating, the normal temperature is firstly heated to 300 ℃, the heating time is controlled to be 10-15 min, then the temperature of the heating furnace is heated to 600 ℃ from 300 ℃, the heating time is 1.25min, then the temperature of the heating furnace is heated to 900 ℃ from 600 ℃, the heating time is 9.5min, and finally the temperature of the heating furnace is heated to 1150 ℃ from 900 ℃, and the heating time is 6.5 min;
i. coating hot melt adhesive: selecting a polyethylene pipe with the outer diameter equal to the inner diameter of the steel pipe, and then uniformly coating a layer of hot melt adhesive on the outer side of the polyethylene pipe;
j. pressurizing and sealing the pipe: inserting a polyethylene pipe into the steel pipe to enable the outer side of the polyethylene pipe to be in contact with the inner side of the steel pipe, then arranging a spraying device on the inner side of the polyethylene pipe, sealing two ends of the polyethylene pipe, and then pressurizing the inner side of the polyethylene pipe to enable the outer side of the polyethylene pipe to be only attached to the steel pipe;
k. heating: heating the steel pipe by the induction heating ring, spraying water mist to the inner side of the polyethylene pipe by a spraying device during the heating process of the steel pipe, wherein the spraying of the water mist is carried out at intervals, the spraying is carried out every 3.5 seconds, and the heating ring heats the steel pipe until the hot melt adhesive is melted;
l, exhausting: after the hot melt adhesive is melted, and the steel pipe and the polyethylene pipe are fully cooled, the gas in the polyethylene pipe is discharged, and the production of the steel pipe is completed.
Example three: a method of producing a steel pipe comprising the steps of:
a. selecting materials and shearing plates: selecting proper steel according to the requirements of the steel pipe to be produced, then rolling the selected steel into a coiled plate in a hot rolling mode, and then cutting the hot-rolled coiled plate into proper size according to the size of the steel to be produced by using a shear to be built;
b. cold rolling and forming: feeding the steel plate cut into a specified size into a roller type forming machine for rolling, and rolling the steel strip by 360 degrees to form a blank steel pipe; the method has the advantages that lubricating oil is sprayed on the surface of the steel strip in the process of rolling the steel strip by using the roller type forming machine, so that the problem that the surface of the steel strip is wrinkled due to large friction force in the process of rolling is solved;
c. deoiling: spraying carbon tetrachloride on the inner surface and the outer surface of the blank steel pipe, keeping the carbon tetrachloride on the surface of the steel pipe for five minutes, washing the surface of the blank steel pipe with water, and drying the surface of the steel pipe with high-pressure gas;
d. acid washing: pickling a blank steel pipe to remove an oxide layer on the surface of the blank steel pipe, firstly heating an acid solution by a heating furnace, heating the acid solution to 60 ℃, then washing the surface of the blank steel pipe by using the heated acid solution, washing the surface of the blank steel pipe for three times during washing, firstly washing the surface of the blank steel pipe for 50min by using nitric acid with the concentration of 7g/L, then washing the surface of the blank steel pipe for 15min by using hydrofluoric acid with the concentration of 9g/L, finally washing the surface of the blank steel pipe for 50min by using sodium citrate with the concentration of 4g/L, cleaning the surface of the blank steel pipe by using clear water after pickling is finished, and then blowing the surface of the steel pipe by;
e. and (3) welding the pipe seam: welding the joint of the pickled blank steel pipe by using high-frequency welding equipment;
f. welding seam treatment: after welding, welding seams and welding slag are left on the inner side and the outer side of the steel pipe, and in order to ensure the flatness of the inner surface and the outer surface of the steel pipe, arc-shaped scrapers are needed to clean the welding slag at the welding seams and to enable the welding seams to be more smooth;
g. and (3) detecting a welding seam: the steel pipe after the welding seam treatment is sent into an eddy current flaw detector for flaw detection, pipe cutting and sampling are needed at any time in the production process, and then flattening testing is carried out on the welding seam of the sample, so that the production quality is ensured;
h. and (3) heat treatment: the steel pipe is sent into a heating furnace for heat treatment, the heating time of the heating furnace is controlled to be 15min from the normal temperature of 300 ℃ when the heating furnace is heated, then the temperature of the heating furnace is heated to 600 ℃ from 300 ℃, the heating time is 1.5min, then the temperature of the heating furnace is heated to 900 ℃ from 600 ℃, the heating time is 10min, and finally the temperature of the heating furnace is heated to 1150 ℃ from 900 ℃, and the heating time is 7 min;
i. coating hot melt adhesive: selecting a polyethylene pipe with the outer diameter equal to the inner diameter of the steel pipe, and then uniformly coating a layer of hot melt adhesive on the outer side of the polyethylene pipe;
j. pressurizing and sealing the pipe: inserting a polyethylene pipe into the steel pipe to enable the outer side of the polyethylene pipe to be in contact with the inner side of the steel pipe, then arranging a spraying device on the inner side of the polyethylene pipe, sealing two ends of the polyethylene pipe, and then pressurizing the inner side of the polyethylene pipe to enable the outer side of the polyethylene pipe to be only attached to the steel pipe;
k. heating: heating the steel pipe by the induction heating ring, spraying water mist to the inner side of the polyethylene pipe by a spraying device during the heating process of the steel pipe, wherein the spraying of the water mist is carried out at intervals, the spraying is carried out once every 5 seconds, and the heating ring heats the steel pipe until the hot melt adhesive is melted;
l, exhausting: after the hot melt adhesive is melted, and the steel pipe and the polyethylene pipe are fully cooled, the gas in the polyethylene pipe is discharged, and the production of the steel pipe is completed.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (8)
1. A production method of a steel pipe is characterized in that: the method comprises the following steps:
a. selecting materials and shearing plates: selecting proper steel according to the requirements of the steel pipe to be produced, then rolling the selected steel into a coiled plate in a hot rolling mode, and then cutting the hot-rolled coiled plate into proper size according to the size of the steel to be produced by using a strip steel shearing machine;
b. cold rolling and forming: feeding the steel strip cut into a specified size into a roller type forming machine for rolling, and rolling the steel strip by 360 degrees to form a blank steel pipe;
c. and (3) welding the pipe seam: welding the joint of the pickled blank steel pipe by using high-frequency welding equipment;
d. welding seam treatment: after welding, welding seams and welding slag are left on the inner side and the outer side of the steel pipe, and in order to ensure the flatness of the inner surface and the outer surface of the steel pipe, arc-shaped scrapers are needed to clean the welding slag at the welding seams and to enable the welding seams to be more smooth;
e. and (3) detecting a welding seam: the steel pipe after the welding seam treatment is sent into an eddy current flaw detector for flaw detection, pipe cutting and sampling are needed at any time in the production process, and then flattening testing is carried out on the welding seam of the sample, so that the production quality is ensured;
f. and (3) heat treatment: the steel pipe is sent into a heating furnace for heat treatment, when the heating furnace is used for heating, the steel pipe is firstly heated to 300 ℃ from normal temperature, the heating time is controlled to be 10-15 min, then the temperature of the heating furnace is heated to 600 ℃ from 300 ℃, the heating time is 1-1.5 min, then the temperature of the heating furnace is heated to 900 ℃ from 600 ℃, the heating time is 9-10 min, and finally the temperature of the heating furnace is heated to 1150 ℃ from 900 ℃, and the heating time is 6-7 min;
g. coating hot melt adhesive: selecting a polyethylene pipe with the outer diameter equal to the inner diameter of the steel pipe, and then uniformly coating a layer of hot melt adhesive on the outer side of the polyethylene pipe;
h. pressurizing and sealing the pipe: inserting a polyethylene pipe into the steel pipe to enable the outer side of the polyethylene pipe to be in contact with the inner side of the steel pipe, arranging a spraying device on the inner side of the polyethylene pipe, sealing two ends of the polyethylene pipe, and pressurizing the inner side of the polyethylene pipe to enable the outer side of the polyethylene pipe to be tightly attached to the steel pipe;
i. heating: heating the steel pipe by the induction heating ring, spraying water mist to the inner side of the polyethylene pipe by a spraying device during the heating process of the steel pipe, and heating the steel pipe by the heating ring until the hot melt adhesive is melted;
j. exhausting: after the hot melt adhesive is melted, and the steel pipe and the polyethylene pipe are fully cooled, the gas in the polyethylene pipe is discharged, and the production of the steel pipe is completed.
2. A method of producing a steel pipe according to claim 1, characterized in that: and b, spraying lubricating oil on the surface of the steel strip in the process of rolling the steel strip by using the roller type forming machine.
3. A method of producing a steel pipe according to claim 2, characterized in that: in the step b, after the rolling of the blank steel pipe is completed, the lubricating oil on the blank steel pipe needs to be cleaned.
4. A method of producing a steel pipe according to claim 3, characterized in that: in the step b, when the lubricating oil on the blank steel pipe is cleaned, carbon tetrachloride is sprayed to the inner surface and the outer surface of the blank steel pipe, after the carbon tetrachloride is left on the surface of the steel pipe for five minutes, the surface of the blank steel pipe is washed clean by water, and then the surface of the steel pipe is dried by high-pressure gas.
5. A method of producing a steel pipe according to claim 1, characterized in that: and c, before the seam welding of the pipe, pickling is carried out on the blank steel pipe, and the maintenance layer on the surface of the blank steel pipe is removed.
6. A method of producing a steel pipe according to claim 5, characterized in that: in the step c, when acid washing is carried out, firstly, the acid solution is heated by a heating furnace to 20-60 ℃, and then the surface of the blank steel pipe is washed by the heated acid solution.
7. The method for producing a steel pipe according to claim 6, characterized in that: in the step c, when the blank steel pipe is washed, firstly, nitric acid with the concentration of 6 g/L-7 g/L is used for washing for 40 min-50 min, then hydrofluoric acid with the concentration of 8 g/L-9 g/L is used for washing for 10 min-15 min, finally, sodium citrate with the concentration of 2 g/L-4 g/L is used for washing for 45 min-50 min, after the acid washing is finished, the surface of the blank steel pipe is cleaned by clear water, and then the surface of the steel pipe is dried by high-pressure gas.
8. A method of producing a steel pipe according to claim 1, characterized in that: and in the step i, spraying water mist at intervals of 2-5 s.
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| CN113000625A (en) * | 2021-03-19 | 2021-06-22 | 无锡圣唐液压成型精密钢管有限公司 | Welded pipe processing technology capable of replacing seamless pipe |
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| JPH01278329A (en) * | 1988-04-30 | 1989-11-08 | C I Kasei Co Ltd | Manufacture of vinyl chloride resin lined steel tube |
| JPH11293483A (en) * | 1998-04-06 | 1999-10-26 | Nippon Steel Corp | Wringer roll and its production |
| CN1169666C (en) * | 2002-02-05 | 2004-10-06 | 揭东经济开发试验区泰丰侨金属制品有限公司 | Method for manufacturing steel-plastic composite pipe with zinc plated outside and polyethylene lined inside |
| CN1284661C (en) * | 2002-05-23 | 2006-11-15 | 上海卫邦管道有限公司 | Manufacturing method plastic lining composite steel pipe and its manufacturing equipment |
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Denomination of invention: Production method of steel pipes Effective date of registration: 20230921 Granted publication date: 20200529 Pledgee: Jiangsu Bank Co.,Ltd. Shanghai Minhang Branch Pledgor: SHANGHAI JINBAOLAI NEW MATERIAL TECHNOLOGY CO.,LTD. Registration number: Y2023310000576 |
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