CN114210761A - High-frequency induction seamless titanium welded pipe and production method thereof - Google Patents
High-frequency induction seamless titanium welded pipe and production method thereof Download PDFInfo
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- CN114210761A CN114210761A CN202111645007.5A CN202111645007A CN114210761A CN 114210761 A CN114210761 A CN 114210761A CN 202111645007 A CN202111645007 A CN 202111645007A CN 114210761 A CN114210761 A CN 114210761A
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 239000010936 titanium Substances 0.000 title claims abstract description 70
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 70
- 230000006698 induction Effects 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 238000003466 welding Methods 0.000 claims abstract description 56
- 238000010622 cold drawing Methods 0.000 claims abstract description 45
- 230000009467 reduction Effects 0.000 claims abstract description 19
- 238000005498 polishing Methods 0.000 claims abstract description 14
- 238000004140 cleaning Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000006748 scratching Methods 0.000 claims abstract description 4
- 230000002393 scratching effect Effects 0.000 claims abstract description 4
- 238000000137 annealing Methods 0.000 claims description 20
- 231100000241 scar Toxicity 0.000 claims description 11
- 238000001125 extrusion Methods 0.000 claims description 8
- 238000007790 scraping Methods 0.000 claims description 8
- 239000002893 slag Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 239000003921 oil Substances 0.000 claims description 4
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 3
- 208000032544 Cicatrix Diseases 0.000 claims description 3
- 239000003963 antioxidant agent Substances 0.000 claims description 3
- 230000003078 antioxidant effect Effects 0.000 claims description 3
- 239000010953 base metal Substances 0.000 claims description 3
- 239000002199 base oil Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 3
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- 238000001035 drying Methods 0.000 claims description 3
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- 150000004665 fatty acids Chemical class 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
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- 239000011261 inert gas Substances 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims description 2
- 239000012768 molten material Substances 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 14
- 230000004927 fusion Effects 0.000 abstract description 9
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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
- 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
- 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
- B21C37/0807—Tube treating or manipulating combined with, or specially adapted for use in connection with tube making machines, e.g. drawing-off devices, cutting-off
- B21C37/0811—Tube treating or manipulating combined with, or specially adapted for use in connection with tube making machines, e.g. drawing-off devices, cutting-off removing or treating the weld bead
-
- 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
- B21C9/00—Cooling, heating or lubricating drawing material
- B21C9/005—Cold application of the lubricant
-
- 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
- B21D39/02—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal by folding, e.g. connecting edges of a sheet to form a cylinder
- B21D39/028—Reinforcing the connection otherwise than by deforming, e.g. welding
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- Metal Extraction Processes (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention provides a high-frequency induction seamless titanium welded pipe and a production method thereof, belonging to the technical field of titanium welded pipes and comprising the following steps: (1) forming and welding; (2) scratching and polishing; (3) finishing and storing; (4) cold drawing and cleaning; (5) and (6) heat treatment. The seamless titanium welded pipe produced by the method has the advantages of uniform wall thickness and outer diameter, superior size precision to that of a seamless pipe and a common fusion welded pipe, good mechanical property, realization of a short-flow process route of directly preparing the thin-radius seamless welded pipe from a raw material coil, and great reduction of production cost.
Description
Technical Field
The invention relates to the technical field of titanium welded pipes, in particular to a high-frequency induction seamless titanium welded pipe and a production method thereof.
Background
The titanium and titanium alloy straight welded pipe (titanium welded pipe for short) is made up by rolling titanium and titanium alloy coiled strip or wide plate into pipe form and welding. Titanium pipes can be currently classified into seamless pipes and fusion welded pipes. The seamless tube has complex process, extremely low efficiency, lower yield to about 50 percent and high cost, and the trend of the titanium tube production is realized by vigorously developing thin-wall welded tubes. The price of the titanium belt required for producing the thin-wall titanium welded pipe, particularly the ultrathin-wall titanium belt is high, and the existing main fusion welding process has the lowest limit of the thinnest wall thickness when the titanium pipe is welded. Meanwhile, due to the particularity of the fusion welding process, a welding seam area and a heat affected area are too wide due to high temperature, and a metallographic microstructure, corrosion resistance and the like have great difference from a base material, so that the application of the fusion welding process is severely limited, and the fusion welding process can only be used in an environment with low pressure or low pressure requirement. The cold rolling diameter reduction wall reduction of the fusion straight welded pipe has large equipment investment, the 1 st pass needs annealing, the working procedure is complex, the diameter reduction rate is low, the manufacturing cost is high, and the environmental pollution is caused during acid cleaning. The high-frequency induction straight seam titanium welded pipe adopts high-frequency current and an extrusion roller to implement solid-phase metal connection, has the advantages of high welding speed (maximum 150m/min), extremely narrow welding seam and heat affected zone, close to or equal to that of a parent metal and low manufacturing cost, can finish seam elimination treatment only by polishing, adopts the high-frequency induction straight seam titanium welded pipe to carry out seamless cold drawing (coil drawing or straight drawing), has the welding seam and the heat affected zone completely consistent with the parent metal, large diameter shrinkage, uniform wall thickness, high production efficiency and low manufacturing cost.
Disclosure of Invention
The invention aims to provide a high-frequency induction seamless titanium welded pipe and a production method thereof, wherein the wall thickness and the outer diameter are very uniform, the dimensional accuracy is superior to that of a seamless pipe and a common fusion welded pipe, the mechanical property is good, a short-process technological route that a thin-radius seamless welded pipe is directly prepared from a raw material coil is realized, and the production cost is greatly reduced.
The technical scheme of the invention is realized as follows:
the invention provides a production method of a high-frequency induction seamless titanium welded pipe, which comprises the following steps:
(1) forming and welding: extruding and molding the titanium strip coil which is split into strips with the required width by a forming roller, heating the edge of the strip by adopting high-frequency current of a high-frequency induction solid-state welding machine, and aligning and extruding the edge by an extruding roller to realize welding;
(2) scratching and polishing: the inner and outer scar scraping devices continuously scrape the welding slag extruded by the extrusion roller in the step (1), and 10-12 polishing wheels alternately polish, polish and scrape scars in two groups to enable the welding seams to be flat and smooth;
(3) finishing and storing: carrying out finishing correction and online eddy current inspection on the roundness and straightness of the welded pipe formed in the step (2) by using a finishing die, and then storing a finished pipe;
(4) cold drawing and cleaning: coiling or straight-drawing the mother pipe obtained in the step (3) in a cold drawing medium for at least one pass, then ultrasonically cleaning the titanium pipe with reduced diameter or reduced wall, deoiling and drying;
(5) and (3) heat treatment: and (4) carrying out vacuum annealing treatment on the titanium tube obtained in the step (4).
As a further improvement of the invention, in the step (1), the hole patterns of the forming roller and the extrusion roller are planned according to material properties, hardness, pipe diameter, wall thickness, cold deformation stress and the like, and are made of superhard materials with poor affinity with titanium element, the frequency, power, welding extrusion amount, welding speed and the like of high-frequency current are adjusted according to the properties of the titanium element, the thickness of a titanium strip, the forming pipe diameter and the like, the minimum welding speed is not lower than 60 m/min, and the high-frequency current is not lower than 300 Hz.
As a further improvement of the invention, the welding slag in the step (2) is a thin line-shaped projection formed by extruding the molten materials of the inner and outer shallow surface layers out of the welding seam when the heated edge is subjected to upsetting force by the extrusion roller for welding, after the welding slag is removed, the welding seam is the solid-phase metal close to or equal to the base metal, in order to make the scar scraping smoother, the two groups of online polishing wheels alternately operate, and when one group operates, the other group can be replaced and cleaned.
As a further improvement of the invention, the collection and storage in the step (3) are divided into a coil pipe and a straight pipe, wherein the pipe diameter is less than or equal to 19mm, the wall thickness is less than or equal to 0.8mm, the coil pipe is collected and stored by adopting a winding frame, and the straight pipe is cut into other specifications by flying saw sizing.
As a further improvement of the invention, in the step (4), the outer diameter of the mother pipe is 10-25.4mm, the wall thickness is 0.3-1.0mm, the cold drawing is the air drawing without adding a moving inner core and only using a reducing outer mold, or the diameter reduction and wall reduction cold drawing of the reducing outer mold and the moving inner core are simultaneously added, the cold drawing medium is viscous cold drawing oil prepared by blending 70-85 wt% of base oil, 5-10 wt% of fatty acid, 2-3 wt% of nano-scale high temperature resistant hexagonal boron nitride powder, 2-3 wt% of extreme pressure agent, 2-3 wt% of tackifier and 0.3-0.5% of antioxidant, the NLGI consistency is 1-2, the cold drawing is not required to be coated in advance when the titanium pipe is used for the diameter reduction air drawing, the pipe can be directly cold drawn by pouring the cold drawing into a cold drawing mold bin, the cold drawing medium is required to be filled in the pipe in advance when the wall reduction, the diameter reduction ratio of each pass is between 20-36.5%, the speed is 15-30 m/min.
As a further improvement of the invention, the 1 st pass does not need annealing, then when the reducing amount of each pass is more than 20%, the intermediate annealing is added between every 2 to 3 passes of cold drawing, and when the reducing amount of each pass is less than 20%, one pass is added before the annealing.
As a further improvement of the invention, the intermediate annealing is annealing under the atmosphere of inert gas, the temperature is 600-650 ℃, and the heat preservation time is 5-10 min.
As a further improvement of the invention, during the vacuum annealing in the step (5), the temperature is 600-650 ℃, and the heat preservation time is 30-60 min.
The invention further protects the high-frequency induction seamless titanium welded pipe prepared by the production method.
The high-frequency induction seamless titanium welded pipe is prepared by carrying out cold drawing diameter reduction or wall reduction (disc drawing or straight drawing) and heat treatment on a titanium welded pipe main pipe which is prepared by high-frequency induction welding for at least one pass, wherein the main pipe is a high-frequency induction straight welding titanium pipe (internal and external scar scraping polishing), the appearance surface of the prepared seamless titanium welded pipe is invisible in an original welding line, the wall thickness and the external diameter are uniform, the original welding line and a heat affected zone are in the length direction and the circumferential direction, the structure and the performance of the original welding line and the heat affected zone are consistent with those of the main pipe, and the production method comprises the steps of strip forming and welding, internal and external scar scraping and scar scraping polishing, and cold drawing diameter reduction or wall reduction (disc drawing or straight drawing) and heat treatment on the main pipe.
The seamless titanium welded pipe produced by the method has uniform wall thickness and outer diameter, better dimensional accuracy than the seamless pipe and the common fusion welded pipe, good mechanical property, short process route of directly preparing the thin-wall seamless pipe from the raw material coil by welding and cold drawing, and greatly reduced production cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a process for manufacturing a pipe by high-frequency induction welding;
FIG. 2 is a schematic cross-sectional view of a high frequency induction straight welded parent tube;
FIG. 3 is a schematic drawing of a disk in example 1;
FIG. 4 is a schematic drawing of a straight drawing and a cold drawing in example 2;
FIG. 5 is a schematic structural diagram of a manufactured high-frequency induction seamless titanium welded pipe;
FIG. 6 is a high-power metallographic microstructure comparison diagram of a weld joint, a heat affected zone and a base metal of the high-frequency induction seamless titanium welded pipe manufactured by the invention;
wherein, 1, a forming roller; 2. a squeeze roll; 3. an inner and outer scar scraping device; 4. a polishing wheel; 5. finishing the die; 6. online eddy current; 7. flying sawing; 8. a rolling frame; 9. welding seams; 10. a heat affected zone; 11. a main pipe; 12. seamless titanium welded pipe; 13. a disc drawing machine; 14. unwinding the frame; 15. a straight drawing machine.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
as shown in fig. 1-3, a high-frequency induction seamless titanium welded pipe is made from a split titanium strip coil through forming and welding, scabbing and polishing, finishing and storing, cold-drawing and reducing the diameter or wall of a mother pipe 11 for at least one pass, cleaning and heat treating.
The seamless titanium welded pipe 12 has an outer diameter of 6mm, a wall thickness of 0.4mm, a length of L (coil pipe) and is a reducing hollow seamless pipe;
the main pipe 11 is a TA1 grade high frequency induction straight welded titanium pipe (coil pipe) with an outer diameter of 10mm, a wall thickness of 0.4mm and a length L.
A method for producing a seamless titanium welded pipe as described above, comprising the steps of:
(1) forming and welding: extruding and molding the titanium strip coil which is split into strips with required width by a forming roller 1, heating the edge of the strip by adopting high-frequency current of a high-frequency induction solid-state welding machine, aligning and extruding the edge by an extruding roller 2, and realizing welding; the lowest welding speed is 80 m/min, and the high-frequency current is 320 Hz;
(2) scratching and polishing: the inner and outer scar scraping device 3 continuously scrapes the welding slag extruded by the extrusion roller in the step (1), and 10-12 polishing wheels 4 alternately polish, polish and scrape scars in two groups to enable the welding seam to be flat and smooth;
(3) finishing and storing: carrying out finishing correction and online eddy current 6 flaw detection on the roundness and straightness of the welded pipe formed in the step (2) by using a finishing die 5, and then storing a finished pipe;
(4) cold drawing and cleaning: coiling or straight-drawing the mother pipe 11 obtained in the step (3) in a cold-drawing medium for at least one pass, then ultrasonically cleaning the titanium pipe with reduced diameter or reduced wall, deoiling and drying;
(5) and (3) heat treatment: and (4) carrying out vacuum annealing treatment on the titanium tube obtained in the step (4).
In the step (4), in order to improve the cold drawing efficiency, a cold drawing disk drawing machine is adopted, the cold drawing speed is 22m/min, the used shaping external mold is made of hard alloy materials, and the used cold drawing medium has sufficient viscosity and lubricity and can form a protective oil film on the surface of the titanium pipe; the cold drawing medium is viscous cold drawing oil prepared by blending 80.5 wt% of base oil, 10 wt% of fatty acid, 3 wt% of nano-scale high-temperature-resistant hexagonal boron nitride powder, 3 wt% of extreme pressure agent, 3 wt% of tackifier and 0.5% of antioxidant, and the NLGI consistency grade is 1.5.
In the step (4), the diameter reduction rate of each cold drawing is controlled to be 26%;
in the step (4), annealing is not needed in the 1 st pass, then when the diameter variation of each pass is more than 20%, intermediate annealing is added between every 2-3 passes of cold drawing, and when the diameter variation of each pass is less than 20%, one pass is added before annealing;
adopting secondary disc cold drawing, adopting a shaping external mold with the outer diameter of 8mm for the first cold drawing, adopting a shaping external mold with the outer diameter of 6mm for the second cold drawing, and obtaining a seamless titanium welded pipe 12 with the outer diameter of 6mm, the wall thickness of 0.4mm and the length of L (coil pipe) after the secondary disc cold drawing;
and (5) controlling the temperature to be 600 ℃ and keeping the temperature for 30min during vacuum annealing in the step (5).
The appearance surface of the seamless titanium welded pipe 12 prepared by the steps is invisible with the original welding line 9, the wall thickness and the outer diameter are uniform, the structure and the performance of the original welding line 9 and the heat affected zone 10 are consistent with those of the main pipe 11 in the length direction and the circumferential direction, and the seamless titanium welded pipe is a polygonal equiaxial structure with uniform size. According to the figure 6, the original welding line on the appearance surface of the prepared seamless titanium welded pipe is invisible, the wall thickness and the outer diameter are uniform, the structure and the performance of the original welding line 9 and the heat affected zone 10 in the length direction and the circumferential direction are consistent with those of the mother pipe 11, the seamless titanium welded pipe is a polygonal equiaxial structure with uniform size, the process route that the thin-wall seamless titanium welded pipe is directly prepared by a raw material coil through welding and cold drawing is realized, and the production cost is greatly reduced.
Example 2:
see fig. 4-5.
The seamless titanium welded pipe 12 has an outer diameter of 14mm, a wall thickness of 0.5mm and a length of 18000mm, and is a reduced diameter and reduced wall cold drawn seamless pipe.
The outer diameter of the mother pipe is 19mm, the wall thickness is 0.6mm, and the length is TA1 grade high frequency induction straight welding titanium pipe (straight pipe) of 15000 mm.
In the step (4), straight-pull cold drawing is carried out by adopting a chain type straight drawing machine, a shaping external mold with the outer diameter of 16mm is adopted for one-time cold drawing, the wall of a moving inner core is reduced by 0.06mm, a shaping external mold with the outer diameter of 14mm is adopted for the second-time cold drawing, and the wall of the moving inner core is reduced by 0.04mm, so that the seamless titanium welded pipe 12 with the outer diameter of 14mm, the wall thickness of 0.5mm and the length of 18000mm is obtained.
The rest of the procedure was the same as in example 1.
Compared with the embodiment 1, the floating inner core is added to reduce the wall, and other conditions are not changed.
Test example 1
The high-frequency induction seamless titanium welded pipes prepared in the embodiment 2 and the embodiment 1 of the invention are subjected to performance tests, and the results are shown in table 1.
TABLE 1
| Group of | Yield strength (MPa) | Tensile strength (MPa) | Elongation after Break (%) | The flaring rate% |
| Example 1 | 472 | 499 | 18 | 45 |
| Example 2 | 497 | 536 | 21 | 53 |
As can be seen from the table, the high-frequency induction seamless titanium welded pipe prepared by the invention has good performance.
In the embodiment 1, the moving inner core is not added for reducing the wall, the mechanical property of the prepared high-frequency induction seamless titanium welded pipe is relatively weakened compared with that of the high-frequency induction seamless titanium welded pipe with diameter reduction and wall reduction at the same time, and after the high-frequency induction seamless titanium welded pipe is subjected to bidirectional extrusion by the sizing outer die and the moving inner core, the grain size of the pipe is smaller, the mechanical property is better, and the inner wall is smoother.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The production method of the high-frequency induction seamless titanium welded pipe is characterized by comprising the following steps of:
(1) forming and welding: extruding and molding the titanium strip coil which is split into strips with required width by a forming roller, heating the edge of the strip by adopting high-frequency current of a high-frequency induction solid-state welding machine, aligning and extruding the edge by an extruding roller, and realizing welding;
(2) scratching and polishing: the inner and outer scar scraping devices continuously scrape the welding slag extruded by the extrusion roller in the step (1), and 10-12 polishing wheels alternately polish, polish and scrape scars in two groups to enable the welding seams to be flat and smooth;
(3) finishing and storing: carrying out finishing correction and online eddy current inspection on the roundness and straightness of the welded pipe formed in the step (2) by using a finishing die, and then storing a finished pipe;
(4) cold drawing and cleaning: coiling or straight-drawing the mother pipe obtained in the step (3) in a cold drawing medium for at least one pass, then ultrasonically cleaning the titanium pipe with reduced diameter or reduced wall, deoiling and drying;
(5) and (3) heat treatment: and (4) carrying out vacuum annealing treatment on the titanium tube obtained in the step (4).
2. The production method of a high-frequency induction seamless titanium welded pipe according to claim 1, wherein in the step (1), the welding speed is not lower than 60 m/min; the frequency of the high-frequency current is not lower than 300 Hz.
3. The method for producing a high-frequency induction seamless titanium welded pipe according to claim 1, wherein the welding slag in the step (2) is a thin line-shaped projection formed by extruding molten materials on an inner surface layer and an outer surface layer out of a welding seam when the heated edge is subjected to upsetting force by a squeeze roll for welding, and the welding seam is a solid-phase metal close to or equal to the base metal after the welding slag is removed.
4. The method for producing high-frequency induction seamless titanium welded pipe according to claim 1, wherein the two sets of polishing wheels in step (2) are alternately operated, and when one set is operated, the other set is replaced and cleaned.
5. The method for producing the high-frequency induction seamless titanium welded pipe according to claim 1, wherein the storage in the step (3) is divided into a coil pipe and a straight pipe, wherein the coil pipe is stored by adopting a rolling frame with the pipe diameter less than or equal to 19mm and the wall thickness less than or equal to 0.8mm, and the straight pipe is cut into the straight pipe by adopting a flying saw with a fixed length in other specifications.
6. The method for producing the high-frequency induction seamless titanium welded pipe according to claim 4, wherein in the step (4), the outer diameter of the mother pipe is 10-25.4mm, the wall thickness is 0.3-1.0mm, the cold drawing is air drawing which only uses a reducing outer die without a moving inner core, or diameter reduction and wall reduction cold drawing which simultaneously adds the reducing outer die and the moving inner core, the cold drawing medium is viscous cold drawing oil prepared by blending 70-85 wt% of base oil, 5-10 wt% of fatty acid, 2-3 wt% of nano high-temperature resistant hexagonal boron nitride powder, 2-3 wt% of extreme pressure agent, 2-3 wt% of tackifier and 0.3-0.5% of antioxidant, the NLGI consistency grade is 1-2, the diameter reduction rate of each pass cold drawing is 20-36.5%, and the speed is 15-30 m/min.
7. The method for producing high-frequency induction seamless titanium welded pipe according to claim 6, wherein the cold-drawing step 1 does not need annealing, and then when the reducing amount of each step is more than 20%, intermediate annealing is added between every 2-3 cold-drawing steps, and when the reducing amount of each step is less than 20%, one more step is added before annealing.
8. The method for producing the high-frequency induction seamless titanium welded pipe as claimed in claim 7, wherein the intermediate annealing is annealing under an inert gas atmosphere at 600-650 ℃ for 5-10 min.
9. The method for producing a high-frequency induction seamless titanium welded pipe as claimed in claim 1, wherein the temperature during the vacuum annealing in step (5) is 600-650 ℃, and the holding time is 30-60 min.
10. A high-frequency induction seamless titanium welded pipe produced by the production method according to any one of claims 1 to 9.
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| CN202111645007.5A CN114210761A (en) | 2021-12-30 | 2021-12-30 | High-frequency induction seamless titanium welded pipe and production method thereof |
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| CN202111645007.5A CN114210761A (en) | 2021-12-30 | 2021-12-30 | High-frequency induction seamless titanium welded pipe and production method thereof |
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