CN110000238A - The production method of steel pipe - Google Patents

The production method of steel pipe Download PDF

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Publication number
CN110000238A
CN110000238A CN201910254027.6A CN201910254027A CN110000238A CN 110000238 A CN110000238 A CN 110000238A CN 201910254027 A CN201910254027 A CN 201910254027A CN 110000238 A CN110000238 A CN 110000238A
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CN
China
Prior art keywords
steel pipe
pipe
steel
heating
polyethylene
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Granted
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CN201910254027.6A
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Chinese (zh)
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CN110000238B (en
Inventor
余泽
郭士荣
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Shanghai Paole New Mstar Technology Ltd
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Shanghai Paole New Mstar Technology Ltd
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Priority to CN201910254027.6A priority Critical patent/CN110000238B/en
Publication of CN110000238A publication Critical patent/CN110000238A/en
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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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

The invention discloses a kind of production methods of steel pipe, are related to the technical field of steel pipe's production, solve the problems, such as to be easy to appear fold on the inside of the plastic tube in existing line plastic-steel tube, its key points of the technical solution are that the following steps are included: a. selection shear；B. cold rolling forms；C. pipe seam welds；D. weld seam is handled；E. weld seam detection；F. it is heat-treated；G. coating hot-melt adhesive；H. pressurize tube sealing；I. it heats；J. it is vented；When being heated to steel pipe, cooled down by way of spray water mist to the inner wall of polyethylene pipe, so that the inner wall of polyethylene pipe is not easy the phenomenon that softening, to be not easy to flow, so that being not easy the phenomenon that fold occur on the inner wall of polyethylene pipe.

Description

The production method of steel pipe
Technical field
The present invention relates to the technical fields of steel pipe's production, more specifically, it is related to a kind of production method of steel pipe.
Background technique
Line plastic-steel tube is one kind of steel pipe, and when carrying out the production of line plastic-steel tube, a most zinc-plated seamless steel pipe is either welded Connecing steel pipe is base tube, after the weldering muscle on steel pipe inner wall is got rid of, is lining on the inner wall of steel pipe equal with the internal diameter of steel pipe Food-grade polyethylene tubing, then polyvinyl piping materials are adhered to after a predetermined time by way of pressurizeing and heating On the inner wall of steel pipe, line plastic-steel tube is a kind of upgrading products of existing steel pipe.
When carrying out line plastic-steel tube production, need to coat one layer of hot melt adhesive, heat on the outer wall of present polyvinyl piping materials The fusing point of melten gel is 120 DEG C, and the fusing point of polyethylene is about 120 DEG C~125 DEG C, the fusing point and softening of hot melt adhesive and polyethylene Point is all that relatively, existing line plastic-steel tube is all using electromagnetic induction heating skill mostly in the process produced Art is produced, but when the inner wall of steel pipe is heated to the temperature of hot melt adhesive thawing, polyethylene pipe as plus Heat and the phenomenon that soften, this is also allowed for, and polyethylene pipe is easy to be flowed because of pressure, so that the inner wall of plastic tube On there is the phenomenon that fold, influence the quality of production of line plastic-steel tube.
Summary of the invention
In view of the deficiencies of the prior art, the present invention intends to provide a kind of production method of steel pipe, right When steel pipe is heated, cooled down by way of spray water mist to the inner wall of polyethylene pipe, so that polyethylene pipe Inner wall is not easy the phenomenon that softening, to be not easy to flow, so that being not easy on the inner wall of polyethylene pipe The phenomenon that existing fold.
To achieve the above object, the present invention provides the following technical scheme that a kind of production method of steel pipe, including following step It is rapid:
A. selection shear: suitable steel are chosen in the requirement of the steel pipe produced as needed, then lead to the steel of selection The mode for crossing hot rolling is rolled into roll bending, the ruler for the steel for then being produced hot-rolled coil as needed using post-waiting cutter It is very little to cut in suitably sized；
B. cold rolling forms: the steel plate for cutting into predetermined size being sent in roller molding machine and carries out rolling, by steel band rolling 360 °, form blank steel pipe；
C. pipe seam welds: being welded using seam crossing of the Suppression of High-frequency Welding Devices to the blank steel pipe after pickling；
D. weld seam handle: welding terminate after, the inner side and outer side of steel pipe all can there are weld seams and welding slag, in order to guarantee in steel pipe The flatness of outer surface needs to clean out the welding slag of commissure using arc-shaped scraper and handle weld seam more It is smooth；
E. weld seam detection: the weld seam steel pipe that processing terminate is sent in eddy current flaw detec and is detected a flaw, and is being given birth to Carry out pipe cutting sampling at any time is needed in the process of production, flattening test then is carried out to the commissure of sample, guarantees production Quality；
F. it is heat-treated: steel pipe being sent in heating furnace and is heat-treated, heated first from room temperature when heating stove heating 300 DEG C are caused, heating time controls in 10min~15min, the temperature of heating furnace is then heated to 600 DEG C from 300 DEG C, heating Time be 1min~1.5min, the temperature of heating furnace is heated to 900 DEG C from 600 DEG C later, heating time be 9min~ The temperature of heating furnace is finally heated to 1150 DEG C from 900 DEG C by 10min, and heating time is 6min~7min；
G. coating hot-melt adhesive: choosing the outer diameter polyethylene pipe equal with pipe diameter, then uniform in the outside of polyethylene pipe Coat one layer of hot melt adhesive；
H. pressurize tube sealing: polyethylene pipe being inserted into steel pipe, so that the inside phase mutual connection in the outside of polyethylene pipe and steel pipe Then touching is arranged spray equipment in the inside of polyethylene pipe, and the both ends of polyethylene pipe is sealed up, later to polyethylene pipe Inside pressurize so that the outside of polyethylene pipe being fitted on steel pipe only；
I. it heats: steel pipe being heated by induction heating circle, steel pipe just passes through spray dress in the process heated The inside spray water mist to polyethylene pipe is set, heating coil heats steel pipe, until hot melt adhesive is melted；
J. it is vented: after hot melt adhesive is melted, after being fully cooled to steel pipe and polyethylene pipe, by the gas in polyethylene pipe Discharge, completes the production of steel pipe.
By using above-mentioned technical proposal, when being heated to steel pipe, from spray equipment into polyethylene pipe Spray water mist on wall, so that temperature is lower than the temperature of polyethylene pipe outer wall at the inner wall of polyethylene pipe, so that poly- second The inner wall of alkene pipe is not easy the problem of softening flowing occur, so that the inner wall of polyethylene pipe asking of being not easy to occur flowing Topic, so that being not easy to form fold because of flowing on the inner wall of polyethylene pipe.
The present invention is further arranged to: in the step b, being worked as in the process for carrying out rolling to steel band using roller molding machine In steel band surface spray lubricating oil.
By using above-mentioned technical proposal, enables to the surface of steel band more smooth by spraying lubricating oil, prevent steel Because frictional force is larger there is the problem of fold in surface in the process for carrying out rolling in band.
The present invention is further arranged to: in the step b, after blank steel pipe rolling is completed, being needed blank steel pipe first On lubricating oil remove it is clean.
By using above-mentioned technical proposal, first the lubricating oil adhered in blank steel tube surface is got rid of, so that hair Base steel pipe when being welded, will not because of lubricating oil presence and cause welding there are quality problems.
The present invention is further arranged to: in the step b, when clearing up the lubricating oil on blank steel pipe, first to hair The surfaces externally and internally of base steel pipe all sprays carbon tetrachloride, will with water by carbon tetrachloride on the surface of steel pipe after indwelling five minutes The surface washing of blank steel pipe is clean, is then dried up the surface of steel pipe with high pressure gas.
By using above-mentioned technical proposal, lubricating oil can be dissolved in carbon tetrachloride, pass through the flushing of carbon tetrachloride Can be clean by the oil flushing in steel tube surface, then by water energy it is enough by steel tube surface mountain do carbon tetrachloride to cleaning Completely, the surface of steel pipe is dried up by high pressure gas later, so that the surface of steel pipe is in drying regime, it will not be to subsequent Processing impacts.
The present invention is further arranged to: the step c, carries out needing to carry out pickling to blank steel pipe before pipe seam welding, The conservation layer of blank steel tube surface is got rid of.
The oxide layer of steel tube surface can be disposed, by carrying out pickling to make by using above-mentioned technical proposal Steel pipe is obtained when being welded, because oxide layer is not present, so that the quality of welding can be improved.
The present invention is further arranged to: in the step c, when carrying out pickling, being carried out first by heating furnace to acid solution Acid solution heating is caused 20 DEG C~60 DEG C, is then rushed using surface of the acid solution after heating to blank steel pipe by heating It washes.
By using above-mentioned technical proposal, first acid solution is heated, so that the temperature of acid solution increases, with temperature Increase, can be improved the speed reacted with oxide layer of acid, to improve the speed of pickling.
The present invention is further arranged to: in the step c, when being rinsed to blank steel pipe, using concentration first 40 min~50min is rinsed for the nitric acid of 6g/L~7g/L, the hydrofluoric acid that concentration is 8g/L~9g/L is reused and rinses 10 min ~15min finally reuses the sodium citrate that concentration is 2g/L~4g/L and cleans 45 min~50min, and pickling is used after terminating Clear water is clean by the surface clean of blank steel pipe, is then dried up the surface of steel pipe with high pressure gas.
By using above-mentioned technical proposal, pickling, Neng Gouti are carried out to blank steel pipe using different acid solutions in three times The effect and speed of high pickling.
The present invention is further arranged to: in the step i, the spray of water mist has interval, is once sprayed every 2s~5s Leaching.
By using above-mentioned technical proposal, the spray for carrying out water mist always be easy to cause the hot melt adhesive on the outside of polyethylene pipe The temperature of thawing is not achieved, by way of the spray of interval, can either prevent it from reaching to cooling down on the inside of polyethylene pipe The temperature of softening will not also impact the thawing of hot melt adhesive.
In conclusion the present invention has the advantages that compared with the prior art
1, the present invention is by being arranged spray equipment when heating to the inner wall spray water mist of polyethylene pipe, so that poly- second The inner wall of alkene pipe is not easy the phenomenon that softening, to be not easy to flow, so that on the inner wall of polyethylene pipe not The phenomenon that being easy to appear fold；
2, the present invention can either prevent it from reaching by setting interval spray for water mist to cooling down on the inside of polyethylene pipe To the temperature of softening, the thawing of hot melt adhesive will not also be impacted.
Specific embodiment
A kind of embodiment one: production method of steel pipe, comprising the following steps:
A. selection shear: suitable steel are chosen in the requirement of the steel pipe produced as needed, then lead to the steel of selection The mode for crossing hot rolling is rolled into roll bending, the ruler for the steel for then being produced hot-rolled coil as needed using post-waiting cutter It is very little to cut in suitably sized；
B. cold rolling forms: the steel plate for cutting into predetermined size being sent in roller molding machine and carries out rolling, by steel band rolling 360 °, form blank steel pipe；Profit is sprayed on the surface of steel band in the process for carrying out rolling to steel band using roller molding machine Lubricating oil prevents steel band from because frictional force is larger the problem of fold occur in surface in the process for carrying out rolling；
C. deoil: the surfaces externally and internally for the blank steel pipe being rolled into all is attached with a large amount of lubricating oil, and the presence of lubricating oil is easy shadow Subsequent welding processing is rung, first carbon tetrachloride is all sprayed to the surfaces externally and internally of blank steel pipe, by carbon tetrachloride on the surface of steel pipe It is with water that the surface washing of blank steel pipe is clean after upper indwelling five minutes, then the surface of steel pipe is dried up with high pressure gas；
D. blank steel pipe pickling: is subjected to pickling to remove the oxide layer of blank steel tube surface, first by heating furnace to sour molten Liquid is heated, and acid solution heating is caused 20 DEG C, is then rushed using surface of the acid solution after heating to blank steel pipe It washes, flushing when is rinsed in three times, rinses 40min using the nitric acid that concentration is 6g/L first, and reusing concentration is 8g/ The hydrofluoric acid of L rinses 10min, finally reuses the sodium citrate that concentration is 2g/L and cleans 45min, clear water is used in pickling after terminating The surface clean of blank steel pipe is clean, then the surface of steel pipe is dried up with high pressure gas；
E. pipe seam welds: being welded using seam crossing of the Suppression of High-frequency Welding Devices to the blank steel pipe after pickling；
F. weld seam handle: welding terminate after, the inner side and outer side of steel pipe all can there are weld seams and welding slag, in order to guarantee in steel pipe The flatness of outer surface needs to clean out the welding slag of commissure using arc-shaped scraper and handle weld seam more It is smooth；
G. weld seam detection: the weld seam steel pipe that processing terminate is sent in eddy current flaw detec and is detected a flaw, and is being given birth to Carry out pipe cutting sampling at any time is needed in the process of production, flattening test then is carried out to the commissure of sample, guarantees production Quality；
H. it is heat-treated: steel pipe being sent in heating furnace and is heat-treated, heated first from room temperature when heating stove heating 300 DEG C are caused, heating time controls in 10min, and the temperature of heating furnace is then heated to 600 DEG C from 300 DEG C, and the time of heating is The temperature of heating furnace is heated to 900 DEG C, heating time 9min from 600 DEG C later by 1min, finally by the temperature of heating furnace from 900 DEG C are heated to 1150 DEG C, heating time 6min；
I. coating hot-melt adhesive: choosing the outer diameter polyethylene pipe equal with pipe diameter, then uniform in the outside of polyethylene pipe Coat one layer of hot melt adhesive；
J. pressurize tube sealing: polyethylene pipe being inserted into steel pipe, so that the inside phase mutual connection in the outside of polyethylene pipe and steel pipe Then touching is arranged spray equipment in the inside of polyethylene pipe, and the both ends of polyethylene pipe is sealed up, later to polyethylene pipe Inside pressurize so that the outside of polyethylene pipe being fitted on steel pipe only；
K. it heats: steel pipe being heated by induction heating circle, steel pipe just passes through spray dress in the process heated Set the inside spray water mist to polyethylene pipe, the spray of water mist has interval, once sprayed every 2, heating coil to steel pipe into Row heating, until hot melt adhesive is melted；
L. it is vented: after hot melt adhesive is melted, after being fully cooled to steel pipe and polyethylene pipe, by the gas in polyethylene pipe Discharge, completes the production of steel pipe.
A kind of embodiment two: production method of steel pipe, comprising the following steps:
A. selection shear: suitable steel are chosen in the requirement of the steel pipe produced as needed, then lead to the steel of selection The mode for crossing hot rolling is rolled into roll bending, the ruler for the steel for then being produced hot-rolled coil as needed using post-waiting cutter It is very little to cut in suitably sized；
B. cold rolling forms: the steel plate for cutting into predetermined size being sent in roller molding machine and carries out rolling, by steel band rolling 360 °, form blank steel pipe；Profit is sprayed on the surface of steel band in the process for carrying out rolling to steel band using roller molding machine Lubricating oil prevents steel band from because frictional force is larger the problem of fold occur in surface in the process for carrying out rolling；
C. deoil: the surfaces externally and internally for the blank steel pipe being rolled into all is attached with a large amount of lubricating oil, and the presence of lubricating oil is easy shadow Subsequent welding processing is rung, first carbon tetrachloride is all sprayed to the surfaces externally and internally of blank steel pipe, by carbon tetrachloride on the surface of steel pipe It is with water that the surface washing of blank steel pipe is clean after upper indwelling five minutes, then the surface of steel pipe is dried up with high pressure gas；
D. blank steel pipe pickling: is subjected to pickling to remove the oxide layer of blank steel tube surface, first by heating furnace to sour molten Liquid is heated, and acid solution heating is caused 40 DEG C, is then rushed using surface of the acid solution after heating to blank steel pipe It washes, flushing when is rinsed in three times, rinses 45min using the nitric acid that concentration is 6.5g/L first, reusing concentration is The hydrofluoric acid of 8.5g/L rinses 12.5min, finally reuses the sodium citrate that concentration is 3g/L and cleans 47.5min, pickling terminates It is with clear water that the surface clean of blank steel pipe is clean later, then the surface of steel pipe is dried up with high pressure gas；
E. pipe seam welds: being welded using seam crossing of the Suppression of High-frequency Welding Devices to the blank steel pipe after pickling；
F. weld seam handle: welding terminate after, the inner side and outer side of steel pipe all can there are weld seams and welding slag, in order to guarantee in steel pipe The flatness of outer surface needs to clean out the welding slag of commissure using arc-shaped scraper and handle weld seam more It is smooth；
G. weld seam detection: the weld seam steel pipe that processing terminate is sent in eddy current flaw detec and is detected a flaw, and is being given birth to Carry out pipe cutting sampling at any time is needed in the process of production, flattening test then is carried out to the commissure of sample, guarantees production Quality；
H. it is heat-treated: steel pipe being sent in heating furnace and is heat-treated, heated first from room temperature when heating stove heating 300 DEG C are caused, heating time controls in 10min~15min, the temperature of heating furnace is then heated to 600 DEG C from 300 DEG C, heating Time be 1.25min, the temperature of heating furnace is heated to 900 DEG C, heating time 9.5min from 600 DEG C later, finally will The temperature of heating furnace is heated to 1150 DEG C from 900 DEG C, heating time 6.5min；
I. coating hot-melt adhesive: choosing the outer diameter polyethylene pipe equal with pipe diameter, then uniform in the outside of polyethylene pipe Coat one layer of hot melt adhesive；
J. pressurize tube sealing: polyethylene pipe being inserted into steel pipe, so that the inside phase mutual connection in the outside of polyethylene pipe and steel pipe Then touching is arranged spray equipment in the inside of polyethylene pipe, and the both ends of polyethylene pipe is sealed up, later to polyethylene pipe Inside pressurize so that the outside of polyethylene pipe being fitted on steel pipe only；
K. it heats: steel pipe being heated by induction heating circle, steel pipe just passes through spray dress in the process heated The inside spray water mist to polyethylene pipe is set, the spray of water mist has interval, is once sprayed every 3.5s, heating coil is to steel pipe It is heated, until hot melt adhesive is melted；
L. it is vented: after hot melt adhesive is melted, after being fully cooled to steel pipe and polyethylene pipe, by the gas in polyethylene pipe Discharge, completes the production of steel pipe.
A kind of embodiment three: production method of steel pipe, comprising the following steps:
A. selection shear: suitable steel are chosen in the requirement of the steel pipe produced as needed, then lead to the steel of selection The mode for crossing hot rolling is rolled into roll bending, the ruler for the steel for then being produced hot-rolled coil as needed using post-waiting cutter It is very little to cut in suitably sized；
B. cold rolling forms: the steel plate for cutting into predetermined size being sent in roller molding machine and carries out rolling, by steel band rolling 360 °, form blank steel pipe；Profit is sprayed on the surface of steel band in the process for carrying out rolling to steel band using roller molding machine Lubricating oil prevents steel band from because frictional force is larger the problem of fold occur in surface in the process for carrying out rolling；
C. deoil: the surfaces externally and internally for the blank steel pipe being rolled into all is attached with a large amount of lubricating oil, and the presence of lubricating oil is easy shadow Subsequent welding processing is rung, first carbon tetrachloride is all sprayed to the surfaces externally and internally of blank steel pipe, by carbon tetrachloride on the surface of steel pipe It is with water that the surface washing of blank steel pipe is clean after upper indwelling five minutes, then the surface of steel pipe is dried up with high pressure gas；
D. blank steel pipe pickling: is subjected to pickling to remove the oxide layer of blank steel tube surface, first by heating furnace to sour molten Liquid is heated, and acid solution heating is caused 60 DEG C, is then rushed using surface of the acid solution after heating to blank steel pipe It washes, flushing when is rinsed in three times, rinses 50min using the nitric acid that concentration is 7g/L first, and reusing concentration is 9g/ The hydrofluoric acid of L rinses 15min, finally reuses the sodium citrate that concentration is 4g/L and cleans 50min, clear water is used in pickling after terminating The surface clean of blank steel pipe is clean, then the surface of steel pipe is dried up with high pressure gas；
E. pipe seam welds: being welded using seam crossing of the Suppression of High-frequency Welding Devices to the blank steel pipe after pickling；
F. weld seam handle: welding terminate after, the inner side and outer side of steel pipe all can there are weld seams and welding slag, in order to guarantee in steel pipe The flatness of outer surface needs to clean out the welding slag of commissure using arc-shaped scraper and handle weld seam more It is smooth；
G. weld seam detection: the weld seam steel pipe that processing terminate is sent in eddy current flaw detec and is detected a flaw, and is being given birth to Carry out pipe cutting sampling at any time is needed in the process of production, flattening test then is carried out to the commissure of sample, guarantees production Quality；
H. it is heat-treated: steel pipe being sent in heating furnace and is heat-treated, heated first from room temperature when heating stove heating 300 DEG C are caused, heating time controls in 15min, and the temperature of heating furnace is then heated to 600 DEG C from 300 DEG C, and the time of heating is The temperature of heating furnace is heated to 900 DEG C, heating time 10min from 600 DEG C later by 1.5min, finally by the temperature of heating furnace Degree is heated to 1150 DEG C from 900 DEG C, heating time 7min；
I. coating hot-melt adhesive: choosing the outer diameter polyethylene pipe equal with pipe diameter, then uniform in the outside of polyethylene pipe Coat one layer of hot melt adhesive；
J. pressurize tube sealing: polyethylene pipe being inserted into steel pipe, so that the inside phase mutual connection in the outside of polyethylene pipe and steel pipe Then touching is arranged spray equipment in the inside of polyethylene pipe, and the both ends of polyethylene pipe is sealed up, later to polyethylene pipe Inside pressurize so that the outside of polyethylene pipe being fitted on steel pipe only；
K. it heats: steel pipe being heated by induction heating circle, steel pipe just passes through spray dress in the process heated Set the inside spray water mist to polyethylene pipe, the spray of water mist has interval, once sprayed every 5s, heating coil to steel pipe into Row heating, until hot melt adhesive is melted；
L. it is vented: after hot melt adhesive is melted, after being fully cooled to steel pipe and polyethylene pipe, by the gas in polyethylene pipe Discharge, completes the production of steel pipe.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications It should be regarded as protection scope of the present invention.

Claims (8)

1. a kind of production method of steel pipe, it is characterised in that: the following steps are included:
A. selection shear: suitable steel are chosen in the requirement of the steel pipe produced as needed, then lead to the steel of selection The mode for crossing hot rolling is rolled into roll bending, the ruler for the steel for then being produced hot-rolled coil as needed using post-waiting cutter It is very little to cut in suitably sized；
B. cold rolling forms: the steel plate for cutting into predetermined size being sent in roller molding machine and carries out rolling, by steel band rolling 360 °, form blank steel pipe；
C. pipe seam welds: being welded using seam crossing of the Suppression of High-frequency Welding Devices to the blank steel pipe after pickling；
D. weld seam handle: welding terminate after, the inner side and outer side of steel pipe all can there are weld seams and welding slag, in order to guarantee in steel pipe The flatness of outer surface needs to clean out the welding slag of commissure using arc-shaped scraper and handle weld seam more It is smooth；
E. weld seam detection: the weld seam steel pipe that processing terminate is sent in eddy current flaw detec and is detected a flaw, and is being given birth to Carry out pipe cutting sampling at any time is needed in the process of production, flattening test then is carried out to the commissure of sample, guarantees production Quality；
F. it is heat-treated: steel pipe being sent in heating furnace and is heat-treated, heated first from room temperature when heating stove heating 300 DEG C are caused, heating time controls in 10min~15min, the temperature of heating furnace is then heated to 600 DEG C from 300 DEG C, heating Time be 1min~1.5min, the temperature of heating furnace is heated to 900 DEG C from 600 DEG C later, heating time be 9min~ The temperature of heating furnace is finally heated to 1150 DEG C from 900 DEG C by 10min, and heating time is 6min~7min；
G. coating hot-melt adhesive: choosing the outer diameter polyethylene pipe equal with pipe diameter, then uniform in the outside of polyethylene pipe Coat one layer of hot melt adhesive；
H. pressurize tube sealing: polyethylene pipe being inserted into steel pipe, so that the inside phase mutual connection in the outside of polyethylene pipe and steel pipe Then touching is arranged spray equipment in the inside of polyethylene pipe, and the both ends of polyethylene pipe is sealed up, later to polyethylene pipe Inside pressurize so that the outside of polyethylene pipe being fitted on steel pipe only；
I. it heats: steel pipe being heated by induction heating circle, steel pipe just passes through spray dress in the process heated The inside spray water mist to polyethylene pipe is set, heating coil heats steel pipe, until hot melt adhesive is melted；
J. it is vented: after hot melt adhesive is melted, after being fully cooled to steel pipe and polyethylene pipe, by the gas in polyethylene pipe Discharge, completes the production of steel pipe.
2. the production method of steel pipe according to claim 1, it is characterised in that: in the step b, utilizing roll-type forming Machine carries out steel band to spray lubricating oil on the surface of steel band in the process of rolling.
3. the production method of steel pipe according to claim 2, it is characterised in that: in the step b, blank steel pipe rolling is complete It is clean at, needing first to remove the lubricating oil on blank steel pipe later.
4. the production method of steel pipe according to claim 3, it is characterised in that: in the step b, on blank steel pipe When lubricating oil is cleared up, carbon tetrachloride is all first sprayed to the surfaces externally and internally of blank steel pipe, by carbon tetrachloride on the surface of steel pipe It is with water that the surface washing of blank steel pipe is clean after upper indwelling five minutes, then the surface of steel pipe is dried up with high pressure gas.
5. the production method of steel pipe according to claim 1, it is characterised in that: the step c, before progress pipe seam welding It needs to carry out pickling to blank steel pipe, the conservation layer of blank steel tube surface is got rid of.
6. the production method of steel pipe according to claim 5, it is characterised in that: first when carrying out pickling in the step c It first passes through heating furnace to heat acid solution, acid solution heating is caused 20 DEG C~60 DEG C, it is then molten using the acid after heating Liquid is rinsed the surface of blank steel pipe.
7. the production method of steel pipe according to claim 6, it is characterised in that: in the step c, carried out to blank steel pipe When flushing, first using concentration be 6g/L~7g/L nitric acid rinse 40 min~50min, reuse concentration be 8g/L~ The hydrofluoric acid of 9g/L rinses 10 min~15min, finally reuses the sodium citrate that concentration is 2g/L~4g/L and cleans 45 min ~50min, pickling is clean by the surface clean of blank steel pipe with clear water after terminating, then with high pressure gas by the surface of steel pipe Drying.
8. the production method of steel pipe according to claim 1, it is characterised in that: in the step i, between the spray of water mist has Every once being sprayed every 2s~5s.
CN201910254027.6A 2019-03-30 2019-03-30 Method for producing steel pipe Active CN110000238B (en)

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CN110814039A (en) * 2019-12-27 2020-02-21 临清市东华轴承钢管有限责任公司 Method for producing small-caliber bearing steel pipe
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
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CN110814039A (en) * 2019-12-27 2020-02-21 临清市东华轴承钢管有限责任公司 Method for producing small-caliber bearing steel pipe
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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Denomination of invention: Production method of steel pipes

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