CN107159801A - A kind of pipeline engineering is with large-caliber thin-walled gapless stainless steel tube production technology - Google Patents
A kind of pipeline engineering is with large-caliber thin-walled gapless stainless steel tube production technology Download PDFInfo
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- CN107159801A CN107159801A CN201710588885.5A CN201710588885A CN107159801A CN 107159801 A CN107159801 A CN 107159801A CN 201710588885 A CN201710588885 A CN 201710588885A CN 107159801 A CN107159801 A CN 107159801A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/08—Tube expanders
-
- 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
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
- B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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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
- C21D6/00—Heat treatment of ferrous alloys
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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
-
- 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
- C23C22/05—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 using aqueous solutions
- C23C22/06—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 using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
- C23C22/08—Orthophosphates
- C23C22/12—Orthophosphates containing zinc cations
- C23C22/13—Orthophosphates containing zinc cations containing also nitrate or nitrite anions
-
- 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
- C23G1/081—Iron or steel solutions containing H2SO4
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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
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/19—Iron or steel
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- General Chemical & Material Sciences (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Metal Extraction Processes (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a kind of pipeline engineering with large-caliber thin-walled gapless stainless steel tube production technology, successively as follows, degreasing and solution heat treatment are carried out to Stainless pipe billet, reheated and carry out repeatedly expanding, aligning, surfaces externally and internally monolithic finish, ultrasonic examination, pickling, washing, phosphatization, lubrication, drawing, degreasing, solution heat treatment, second aligning, Pipe Cutting, pickling, inspection, spray for the first time and marked and be put in storage.A kind of pipeline engineering involved in the present invention is with large-caliber thin-walled gapless stainless steel tube production technology, using the teaching of the invention it is possible to provide a kind of technique is simple, production cost is low and the stainless steel tube produced disclosure satisfy that pipeline engineering construction requirement.And the present invention production technology also have loss less, suitable for batch production the characteristics of.
Description
Technical field
The present invention relates to stainless steel tube production technical field, especially a kind of pipeline engineering is with large-caliber thin-walled seamless stainless
Steel production technology.
Background technology
In the prior art, produce large-caliber thin-walled gapless stainless steel tube and mainly use following several production technologies：First
Kind, Tube Rolling Train supplies base+plug expander；Second, Tube Rolling Train is for base+entirety heating drawing type thermal expansion machine；The third, rolls
Pipe unit supplies base+heat stepwise push mode expanding machine, and the 4th kind, Tube Rolling Train is drawn for the outer drawing machine processing of base+interior boring+entirety heating
Pull out formula thermal expansion machine.
Wherein, the first technique is that continuous cast round billets are rolled into pipe by one kind via MPM MPM tube rolling mills, then
Expand the production technology for being made as finished product via plug expander.The technique is thin-wall seamless steel pipe in modern production heavy caliber（For
The specification of external diameter/wall thickness≤48）The best approach, however, the technique has, up-front investment is big, production cost is high, the construction period
Long the features such as.In addition, the technique also has its limitation, its thickness of steel pipe deviation produced preferably can only achieve ± 12.5%, and
Steel pipe inside and outside surface quality is poor.
Second and the third technique have the characteristics of production technology is easy, cost is low, however, steel pipe made from the technique
Geometric accuracy and inside and outside surface quality are poor.
4th kind of technique is adapted to produce the special light-wall pipe that has certain requirements to geometric accuracy, however, it has production
The deficiency such as complex process, efficiency are low, metal loss is big, lumber recovery is low, cost is high.
The content of the invention
It is an object of the invention to provide a kind of pipeline engineering with large-caliber thin-walled stainless steel tube production technology, life is enabled to
Production. art simplifies, efficiency high, and can reduce cost, can produce satisfactory stainless steel tube.
In order to solve the above technical problems, the object of the present invention is achieved like this：A kind of pipeliner involved in the present invention
Journey is in turn included the following steps with large-caliber thin-walled stainless steel tube production technology：
Step A, to Stainless pipe billet carry out degreasing, solution heat treatment；
Step B, the stainless steel tube after processing of step A is heated, 950~1100 DEG C are heated to, using drawing type pipe expander
Group is expanding to being carried out to the stainless steel tube after processing of step A；
Described is expanding by the way of small variable multi-pass；Described small variable refer to every time expanding amount control less than
35mm scope, and ensure simultaneously it is expanding after stainless steel tube any section outer diameter tolerance for ± 0.75%, wall thickness tolerance be
±12.5%；It is expanding that described multi-pass refers to that 2~5 step B of repetition are carried out to stainless steel tube；
Step C, to by repeatedly it is expanding after stainless steel tube carry out first time aligning；
Step D, the stainless steel tube inner and outer surfaces by aligning for the first time are carried out with overall reconditioning, and control reconditioning quality for 1~
1.2mm；
Step E, to step C processing after stainless steel tube carry out ultrasonic examination inspection；
Step F, stainless steel tube progress pickling, washing, phosphatization and lubrication to detecting a flaw qualified；
Step G, multiple drawing carried out to the stainless steel tube after step F processing using precise hydraulic drawbench, prepare heavy caliber thin
The external diameter of wall stainless steel tube be 600~800mm, and control stainless steel tube external diameter and wall thickness ratio 60~85；Draw every time
Drawing speed is 0.5~2.5m/min when pulling out, and hydraulic pressure is 5~8MPa, by wall thickness reducing amount control in 1.8~2.2mm, sizing reduction
Control is in 5~9mm；The external diameter of the large-caliber thin-walled stainless steel tube and the ratio of wall thickness are 55~75；
Step H, to step G processing after stainless steel tube carry out degreasing, solution heat treatment；
Step I, second aligning, Pipe Cutting, pickling, inspection is carried out to the stainless steel tube after step H processing, finally spray mark is put in storage.
As a further illustration of the above scheme, in step F and I, described pickling is that stainless steel tube is immersed into descaling bath
In, pickle is previously implanted in descaling bath, pickling temperature is room temperature, and pickling time is 30~60min, and pickling takes after terminating
Go out stainless steel tube to be rinsed well with water；The concentrated sulfuric acid of the described pickle including concentration 98%, ammonium persulfate, potassium fluoride, 8
~oxyquinoline, sodium chloride, thiocarbamide, neopelex and deionized water；Wherein, the quality percentage of 98% concentrated sulfuric acid
It is 3~5% than the mass percent for 10~20%, ammonium persulfate, the mass percent of potassium fluoride is 3~4%, 8~oxyquinoline
Mass percent be 1~1.5%, the mass percent of sodium chloride is 0.3~0.5%, the mass percent of thiocarbamide for 0.1~
0.3%, the mass percent of neopelex is 0.05~0.1%, and surplus is deionized water.
As a further illustration of the above scheme, in step A, containing in the degreasant solution used in described ungrease treatment
There are sodium hydroxide, sodium carbonate, tertiary sodium phosphate；The content of the sodium hydroxide is 60~80g/L, and the content of the sodium carbonate is 60
~80g/L, the content of the tertiary sodium phosphate is 80~100g/L, and surplus is deionized water；The temperature of ungrease treatment be 60~
80 DEG C, the ungrease treatment time is 240min.
As a further illustration of the above scheme, in step A and step H, described solution heat treatment is to put stainless steel
Enter into 1100 DEG C of Solution Treatment Furnace, place 30~60min, be put into after taking-up in cold water and be cooled to room temperature；Described consolidates
The volume ratio of mixed gas filled with nitrogen and hydrogen in molten treatment furnace, nitrogen and hydrogen is 1：2~1：3.
As a further illustration of the above scheme, in step F, described phosphatization is that stainless steel is put into etch in phosphating solution
10~15min, is cleaned after taking-up with water；Described phosphating solution includes zinc dihydrogen phosphate, trbasic zinc phosphate, zinc nitrate, zinc nitrite；Institute
Zinc dihydrogen phosphate, trbasic zinc phosphate, zinc nitrate, the mass ratio of zinc nitrite stated are 1：0.25~0.6：0.25~0.6：1.2~
1.4。
As a further illustration of the above scheme, the external diameter of described Stainless pipe billet be 350mm, wall thickness be 5~
15mm。
As a further illustration of the above scheme, in described stainless steel material is stainless steel for 300.
The beneficial effects of the invention are as follows：The large-caliber thin-walled gapless stainless steel tube of a kind of pipeline engineering involved in the present invention
Production technology, using the teaching of the invention it is possible to provide a kind of technique is simple, production cost is low and the stainless steel tube produced disclosure satisfy that pipeline engineering is applied
Work requirement.And the present invention production technology also have loss less, suitable for batch production the characteristics of.
Embodiment
With reference to specific embodiment, the present invention is further described.
Embodiment one
A kind of pipeline engineering involved by the present embodiment is with large-caliber thin-walled stainless steel tube production technology, successively including following step
Suddenly：
Step A, to Stainless pipe billet carry out degreasing, solution heat treatment；Selected stainless steel is stainless steel for 300, tool
Body is 316L.
Contain sodium hydroxide, sodium carbonate, tertiary sodium phosphate in degreasant solution used in ungrease treatment；Institute's sodium hydroxide
Content is 60g/L, and the content of sodium carbonate is 60g/L, and the content of tertiary sodium phosphate is 80g/L, and surplus is deionized water；At degreasing
The temperature of reason is 60 DEG C, and the ungrease treatment time is 240min.
Solution heat treatment, is that stainless steel is put into 1100 DEG C of Solution Treatment Furnace, places 30min, is put into after taking-up
Room temperature is cooled in cold water；The body of mixed gas filled with nitrogen and hydrogen in described Solution Treatment Furnace, nitrogen and hydrogen
Product is than being 1：2.
Step B, the stainless steel tube after processing of step A is heated, 950 DEG C are heated to, using drawing type pipe expanding set
It is expanding to being carried out to the stainless steel tube after processing of step A；The external diameter of Stainless pipe billet is 350mm, and wall thickness is 5~15mm.
It is expanding by the way of small variable multi-pass in this step；Small variable refer to every time expanding amount control less than
35mm scope, and ensure simultaneously it is expanding after stainless steel tube any section outer diameter tolerance for ± 0.75%, wall thickness tolerance be
±12.5%；Multi-pass refer to be repeated 2 times step B stainless steel tube is carried out it is expanding.
Step C, to by repeatedly it is expanding after stainless steel tube carry out first time aligning.
Step D, the overall reconditioning of stainless steel tube inner and outer surfaces progress to being aligned by first time, and control reconditioning quality to be 1
~1.2mm.After thermal expansion processing, form in steel pipe internal-surface that thickness is thicker and attachment is close due to heating
Oxide layer, and during thermal expansion, oxide layer can be embedded in inwall after coming off, and form pit not of uniform size, these are equal
Essence can be had a strong impact on and pull out the progress of process, therefore, the overall thinning technique of surfaces externally and internally is taken, reconditioning quality control can be
0.8mm, the defect such as scuffing, pockmark so as to remove outer surface of tube blank oxide skin and inner surface.
Step E, to step C processing after stainless steel tube carry out ultrasonic examination inspection；Essence pulls out cold deformation process to pipe
Defect have enlarge-effect, even trickle defect will also result in steel tube surface defect, therefore to the control of pipe surface quality
System is most important, and essence should be to pipe by L2 equivalents progress ultrasonic examination preliminary examination in GB/T5777 before pulling out, can after flaw detection is qualified
Carry out essence and pull out process.
Step F, stainless steel tube progress pickling, washing, phosphatization and lubrication to detecting a flaw qualified.
Pickling is to immerse stainless steel tube in descaling bath, pickle has been previously implanted in descaling bath, pickling temperature is room
Temperature, pickling time is 30min, and pickling is taken out stainless steel tube after terminating and rinsed well with water；Described pickle includes dense
Degree 98% the concentrated sulfuric acid, ammonium persulfate, potassium fluoride, 8~oxyquinoline, sodium chloride, thiocarbamide, neopelex and go from
Sub- water；Wherein, the mass percent of 98% concentrated sulfuric acid is 10%, and the mass percent of ammonium persulfate is 3%, the quality of potassium fluoride
Percentage is 3%, and the mass percent of 8~oxyquinoline is 1%, and the mass percent of sodium chloride is 0.3%, the quality hundred of thiocarbamide
Divide than being 0.1%, the mass percent of neopelex is 0.05%, and surplus is deionized water.
Phosphatization is that stainless steel is put into etch 10min in phosphating solution, is cleaned after taking-up with water；Described phosphating solution includes phosphorus
Acid dihydride zinc, trbasic zinc phosphate, zinc nitrate, zinc nitrite；Described zinc dihydrogen phosphate, trbasic zinc phosphate, zinc nitrate, the quality of zinc nitrite
Than for 1：0.25：0.25：1.2.
Step G, multiple drawing carried out to the stainless steel tube after step F processing using precise hydraulic drawbench, prepare big mouth
The external diameter of footpath thin-wall stainless steel be 600mm, and control stainless steel tube external diameter and wall thickness ratio 60；Drawn during each drawing
Speed is pulled out for 0.5m/min, hydraulic pressure is 5MPa, by wall thickness reducing amount control in 1.8mm, sizing reduction is controlled in 5mm；The big mouth
The external diameter of footpath thin-wall stainless steel and the ratio of wall thickness are 55；
Step H, to step G processing after stainless steel tube carry out degreasing, solution heat treatment；
Step I, second aligning, Pipe Cutting, pickling, inspection is carried out to the stainless steel tube after step H processing, finally spray mark is put in storage.
Embodiment two
A kind of pipeline engineering involved by the present embodiment is with large-caliber thin-walled stainless steel tube production technology, successively including following step
Suddenly：
Step A, to Stainless pipe billet carry out degreasing, solution heat treatment；Selected stainless steel is stainless steel for 300, tool
Body is 316L.
Contain sodium hydroxide, sodium carbonate, tertiary sodium phosphate in degreasant solution used in ungrease treatment；Institute's sodium hydroxide
Content is 80g/L, and the content of sodium carbonate is 80g/L, and the content of tertiary sodium phosphate is 100g/L, and surplus is deionized water；Degreasing
The temperature of processing is 80 DEG C, and the ungrease treatment time is 240min.
Solution heat treatment, is that stainless steel is put into 1100 DEG C of Solution Treatment Furnace, places 60min, is put into after taking-up
Room temperature is cooled in cold water；The body of mixed gas filled with nitrogen and hydrogen in described Solution Treatment Furnace, nitrogen and hydrogen
Product is than being 1：3.
Step B, the stainless steel tube after processing of step A is heated, 91100 DEG C are heated to, using drawing type pipe expander
Group is expanding to being carried out to the stainless steel tube after processing of step A；The external diameter of Stainless pipe billet is 350mm, and wall thickness is 15mm.
It is expanding by the way of small variable multi-pass in this step；Small variable refer to every time expanding amount control less than
35mm scope, and ensure simultaneously it is expanding after stainless steel tube any section outer diameter tolerance for ± 0.75%, wall thickness tolerance be
±12.5%；Multi-pass refer to be repeated 5 times step B stainless steel tube is carried out it is expanding.
Step C, to by repeatedly it is expanding after stainless steel tube carry out first time aligning.
Step D, the overall reconditioning of stainless steel tube inner and outer surfaces progress to being aligned by first time, and control reconditioning quality to be 1
~1.2mm.After thermal expansion processing, form in steel pipe internal-surface that thickness is thicker and attachment is close due to heating
Oxide layer, and during thermal expansion, oxide layer can be embedded in inwall after coming off, and form pit not of uniform size, these are equal
Essence can be had a strong impact on and pull out the progress of process, therefore, the overall thinning technique of surfaces externally and internally is taken, reconditioning quality control can be
01.6mm, the defect such as scuffing, pockmark so as to remove outer surface of tube blank oxide skin and inner surface.
Step E, to step C processing after stainless steel tube carry out ultrasonic examination inspection；Essence pulls out cold deformation process to pipe
Defect have enlarge-effect, even trickle defect will also result in steel tube surface defect, therefore to the control of pipe surface quality
System is most important, and essence should be to pipe by L2 equivalents progress ultrasonic examination preliminary examination in GB/T5777 before pulling out, can after flaw detection is qualified
Carry out essence and pull out process.
Step F, stainless steel tube progress pickling, washing, phosphatization and lubrication to detecting a flaw qualified.
Pickling is to immerse stainless steel tube in descaling bath, pickle has been previously implanted in descaling bath, pickling temperature is room
Temperature, pickling time is 60min, and pickling is taken out stainless steel tube after terminating and rinsed well with water；Described pickle includes dense
Degree 98% the concentrated sulfuric acid, ammonium persulfate, potassium fluoride, 8~oxyquinoline, sodium chloride, thiocarbamide, neopelex and go from
Sub- water；Wherein, the mass percent of 98% concentrated sulfuric acid is 20%, and the mass percent of ammonium persulfate is 5%, the quality of potassium fluoride
Percentage is 4%, and the mass percent of 8~oxyquinoline is 1.5%, and the mass percent of sodium chloride is 0.5%, the quality of thiocarbamide
Percentage is 0.3%, and the mass percent of neopelex is 0.1%, and surplus is deionized water.
Phosphatization is that stainless steel is put into etch 15min in phosphating solution, is cleaned after taking-up with water；Described phosphating solution includes phosphorus
Acid dihydride zinc, trbasic zinc phosphate, zinc nitrate, zinc nitrite；Described zinc dihydrogen phosphate, trbasic zinc phosphate, zinc nitrate, the quality of zinc nitrite
Than for 1：0.6：0.6：1.4.
Step G, multiple drawing carried out to the stainless steel tube after step F processing using precise hydraulic drawbench, prepare big mouth
The external diameter of footpath thin-wall stainless steel be 4800mm, and control stainless steel tube external diameter and wall thickness ratio 85；During each drawing
Drawing speed is 2.5m/min, and hydraulic pressure is 8MPa, and by wall thickness reducing amount control in 2.2mm, sizing reduction is controlled in 9mm；It is described big
The external diameter of bore thin-wall stainless steel and the ratio of wall thickness are 75；
Step H, to step G processing after stainless steel tube carry out degreasing, solution heat treatment；
Step I, second aligning, Pipe Cutting, pickling, inspection is carried out to the stainless steel tube after step H processing, finally spray mark is put in storage.
Preferred embodiment of the invention described in detail above.It should be appreciated that one of ordinary skill in the art without
Need creative work just can make many modifications and variations according to the design of the present invention.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical scheme, all should be in the protection domain being defined in the patent claims.
Claims (7)
1. a kind of pipeline engineering is with large-caliber thin-walled gapless stainless steel tube production technology, it is characterised in that successively including following step
Suddenly：
Step A, to Stainless pipe billet carry out degreasing, solution heat treatment；
Step B, the stainless steel tube after processing of step A is heated, 950~1100 DEG C are heated to, using drawing type pipe expander
Group is expanding to being carried out to the stainless steel tube after processing of step A；
Described is expanding by the way of small variable multi-pass；Described small variable refer to every time expanding amount control less than
35mm scope, and ensure simultaneously it is expanding after stainless steel tube any section outer diameter tolerance for ± 0.75%, wall thickness tolerance be
±12.5%；It is expanding that described multi-pass refers to that 2~5 step B of repetition are carried out to stainless steel tube；
Step C, to by repeatedly it is expanding after stainless steel tube carry out first time aligning；
Step D, the stainless steel tube inner and outer surfaces by aligning for the first time are carried out with overall reconditioning, and control reconditioning quality for 1~
1.2mm；
Step E, to step C processing after stainless steel tube carry out ultrasonic examination inspection；
Step F, stainless steel tube progress pickling, washing, phosphatization and lubrication to detecting a flaw qualified；
Step G, multiple drawing carried out to the stainless steel tube after step F processing using precise hydraulic drawbench, prepare heavy caliber thin
The external diameter of wall stainless steel tube be 600~800mm, and control stainless steel tube external diameter and wall thickness ratio 60~85；Draw every time
Drawing speed is 0.5~2.5m/min when pulling out, and hydraulic pressure is 5~8MPa, by wall thickness reducing amount control in 1.8~2.2mm, sizing reduction
Control is in 5~9mm；The external diameter of the large-caliber thin-walled stainless steel tube and the ratio of wall thickness are 55~75；
Step H, to step G processing after stainless steel tube carry out degreasing, solution heat treatment；
Step I, second aligning, Pipe Cutting, pickling, inspection is carried out to the stainless steel tube after step H processing, finally spray mark is put in storage.
2. pipeline engineering as claimed in claim 1 is with large-caliber thin-walled gapless stainless steel tube production technology, it is characterised in that step
In rapid F and I, described pickling is to immerse stainless steel tube in descaling bath, and pickle, pickling temperature have been previously implanted in descaling bath
For for room temperature, pickling time is 30~60min, pickling is taken out stainless steel tube after terminating and rinsed well with water；Described acid
Washing lotion includes the concentrated sulfuric acid, ammonium persulfate, potassium fluoride, 8~oxyquinoline, sodium chloride, thiocarbamide, the detergent alkylate sulphur of concentration 98%
Sour sodium and deionized water；Wherein, the mass percent of 98% concentrated sulfuric acid is 10~20%, and the mass percent of ammonium persulfate is 3
~5%, the mass percent of potassium fluoride is 3~4%, and the mass percent of 8~oxyquinoline is 1~1.5%, the quality of sodium chloride
Percentage is 0.3~0.5%, and the mass percent of thiocarbamide is 0.1~0.3%, and the mass percent of neopelex is
0.05~0.1%, surplus is deionized water.
3. pipeline engineering as claimed in claim 1 is with large-caliber thin-walled gapless stainless steel tube production technology, it is characterised in that step
In rapid A, sodium hydroxide, sodium carbonate, tertiary sodium phosphate are contained in the degreasant solution used in described ungrease treatment；The hydrogen-oxygen
The content for changing sodium is 60~80g/L, and the content of the sodium carbonate is 60~80g/L, the content of the tertiary sodium phosphate for 80~
100g/L, surplus is deionized water；The temperature of ungrease treatment is 60~80 DEG C, and the ungrease treatment time is 240min.
4. pipeline engineering as claimed in claim 1 is with large-caliber thin-walled gapless stainless steel tube production technology, it is characterised in that step
In rapid A and step H, described solution heat treatment is that stainless steel is put into 1100 DEG C of Solution Treatment Furnace, placement 30~
It is put into after 60min, taking-up in cold water and is cooled to room temperature；Gaseous mixture filled with nitrogen and hydrogen in described Solution Treatment Furnace
The volume ratio of body, nitrogen and hydrogen is 1：2~1：3.
5. pipeline engineering as claimed in claim 1 is with large-caliber thin-walled gapless stainless steel tube production technology, it is characterised in that step
In rapid F, described phosphatization is that stainless steel is put into 10~15min of etch in phosphating solution, is cleaned after taking-up with water；Described phosphatization
Liquid includes zinc dihydrogen phosphate, trbasic zinc phosphate, zinc nitrate, zinc nitrite；Described zinc dihydrogen phosphate, trbasic zinc phosphate, zinc nitrate, nitrous acid
The mass ratio of zinc is 1：0.25~0.6：0.25~0.6：1.2~1.4.
6. pipeline engineering as claimed in claim 1 is with large-caliber thin-walled gapless stainless steel tube production technology, it is characterised in that institute
The external diameter for the Stainless pipe billet stated is 350mm, and wall thickness is 5~15mm.
7. pipeline engineering as described in claim 1~6 is existed with large-caliber thin-walled gapless stainless steel tube production technology, its feature
In described stainless steel material is stainless steel for 300.
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| CN111633167A (en) * | 2020-06-09 | 2020-09-08 | 上海蓝铸特种合金材料有限公司 | Forging process special for mask plate support 420J1 |
| CN112077537A (en) * | 2020-09-04 | 2020-12-15 | 江苏武进不锈股份有限公司 | Preparation method of large-caliber stainless steel JCOE welded pipe |
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