CN116748820B - Special-shaped seamless pipe and preparation method thereof - Google Patents
Special-shaped seamless pipe and preparation method thereof Download PDFInfo
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- CN116748820B CN116748820B CN202311054780.3A CN202311054780A CN116748820B CN 116748820 B CN116748820 B CN 116748820B CN 202311054780 A CN202311054780 A CN 202311054780A CN 116748820 B CN116748820 B CN 116748820B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 195
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 195
- 239000010936 titanium Substances 0.000 claims abstract description 195
- 229910052751 metal Inorganic materials 0.000 claims abstract description 193
- 239000002184 metal Substances 0.000 claims abstract description 193
- 238000005242 forging Methods 0.000 claims abstract description 140
- 238000010438 heat treatment Methods 0.000 claims abstract description 96
- 238000011282 treatment Methods 0.000 claims abstract description 86
- 238000001816 cooling Methods 0.000 claims abstract description 72
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims description 54
- 230000008569 process Effects 0.000 claims description 44
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 27
- 238000010304 firing Methods 0.000 claims description 15
- 238000005096 rolling process Methods 0.000 claims description 14
- 230000007704 transition Effects 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 230000009466 transformation Effects 0.000 claims description 8
- 230000009467 reduction Effects 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 229910001040 Beta-titanium Inorganic materials 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 238000004321 preservation Methods 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000003139 buffering effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 241000353135 Psenopsis anomala Species 0.000 description 1
- 101000702105 Rattus norvegicus Sproutin Proteins 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
-
- 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
Abstract
The invention relates to a special-shaped seamless pipe and a preparation method thereof. The preparation method comprises the following steps: sequentially carrying out drawing forging treatment and perforation treatment on the titanium-containing metal cast ingot according to the shape of the designed special-shaped seamless pipe, then carrying out finish forging treatment on the titanium-containing metal pipe blank, and controlling the surface temperature of the titanium-containing metal pipe blank to be 600-1050 ℃ to prepare the finish-forged titanium-containing metal pipe; performing primary heat treatment on the titanium-containing metal pipe, performing water cooling treatment on the titanium-containing metal pipe subjected to primary heat treatment until the surface temperature of the titanium-containing metal pipe is reduced to 500-600 ℃, placing the titanium-containing metal pipe in air for 1-5 min, continuing performing water cooling treatment until the surface temperature of the titanium-containing metal pipe is reduced to 200-300 ℃, and then sequentially performing air cooling treatment and secondary heat treatment to prepare the special-shaped seamless pipe.
Description
Technical Field
The invention relates to the technical field of metal pipes, in particular to a special-shaped seamless pipe and a preparation method thereof.
Background
Along with the wider and wider application of titanium-containing metal materials such as titanium and titanium alloy in the fields of aerospace, naval vessels, ocean engineering, ocean exploration instruments and the like, the demands of titanium and titanium alloy seamless pipes/special-shaped pipes are increased along with castings and forgings, wherein the special-shaped seamless pipes containing titanium metal are mainly applied to equipment or parts with working conditions under severe environments, such as oil field logging instrument shells which need to be placed under sea water for thousands of meters, the pressure which needs to be born is larger, and the corrosion of sea water and marine organisms needs to be born at the same time; such as marine survey instrument housings placed in thousands of meters deep sea, pipes which are subjected to high pressures and are fed with corrosive media, etc.
However, the special-shaped seamless pipe containing titanium metal prepared by the traditional process has the problems of nonuniform structure, low mechanical strength and the like, so that the quality of the product is unstable, and the cost per unit mass is high.
Therefore, the conventional technology has yet to be developed.
Disclosure of Invention
Based on the structure, the invention provides the special-shaped seamless pipe and the preparation method thereof, and the preparation method of the special-shaped seamless pipe can improve the uniformity of the tissue structure of the special-shaped seamless pipe, has excellent mechanical strength and toughness, and has high dimensional accuracy.
In one aspect, the present application provides a method for preparing a seamless pipe, including the following steps:
according to the shape of the designed special-shaped seamless pipe, sequentially carrying out drawing forging treatment and perforation treatment on the titanium-containing metal cast ingot to prepare a hollow titanium-containing metal pipe blank;
inserting a rod core into a hollow pipeline of the titanium-containing metal pipe blank, and then carrying out finish forging on the titanium-containing metal pipe blank, wherein the finish forging direction of the finish forging is from one end to the other end of the titanium-containing metal pipe blank in the length direction, so as to prepare a finish forged titanium-containing metal pipe; in the process of finish forging treatment, controlling the surface temperature of the titanium-containing metal tube blank to be 600-1050 ℃;
performing primary heat treatment on the titanium-containing metal pipe; and (3) performing water cooling treatment on the titanium-containing metal pipe subjected to the first heat treatment until the surface temperature of the titanium-containing metal pipe is reduced to 500-600 ℃, placing the titanium-containing metal pipe in air for 1-5 min, continuing performing water cooling treatment until the surface temperature of the titanium-containing metal pipe is reduced to 200-300 ℃, and then sequentially performing air cooling treatment and second heat treatment to prepare the special-shaped seamless pipe.
In the method for preparing the special-shaped seamless pipe, the drawing forging treatment and the perforation treatment are sequentially carried out to prepare the titanium-containing metal pipe blank, then the finish forging treatment is carried out, and the surface temperature of the titanium-containing metal pipe blank in the finish forging treatment process is controlled, so that the tissue structures of all parts of the pipe are grown to proper sizes and simultaneously the good plastic deformation capacity is maintained, the mechanical property of the pipe is improved, and the occurrence probability of cracks of the pipe is reduced; and performing water cooling treatment to a specific surface temperature after performing primary heat treatment on the finish-forged titanium-containing metal pipe, stopping the water cooling treatment, and placing in the air for a specific time to enable the internal temperature and the surface temperature of the titanium-containing metal pipe to be subjected to temperature returning buffering for a specific time, enabling the internal temperature and the surface temperature of the titanium-containing metal pipe to be consistent, continuing to perform water cooling treatment to a specific temperature, performing air cooling, performing secondary heat treatment again, and reducing the probability of reducing the structural uniformity of the special-shaped seamless pipe due to different cooling degrees of different positions of the surface and the internal of the titanium-containing metal pipe, thereby improving the structural uniformity of the special-shaped seamless pipe and having excellent mechanical strength and toughness.
Meanwhile, in the preparation method, the drawing forging treatment and the perforation treatment are sequentially carried out to prepare the titanium-containing metal tube blank, then the finish forging treatment is carried out, the inner diameter and the outer diameter of the tube can be adjusted only by adjusting the size of a rod core and the finish forging technological parameters during finish forging, and the prepared special-shaped seamless tube is high in size precision and high in yield.
In some embodiments, the structures at two ends of the special-shaped seamless pipe are symmetrical, the number of times of finish forging treatment is at least two, and the finish forging directions of two adjacent finish forging treatments are opposite.
And when the structures at the two ends of the special-shaped seamless pipe are symmetrical, performing finish forging treatment at least twice, wherein the finish forging directions of the finish forging treatment of two adjacent times are opposite, so that the dimensional accuracy of the pipe with symmetrical structure is further improved.
It can be understood that the first finish forging treatment is performed from one end to the other end in the length direction of the titanium-containing metal pipe blank, and the starting point in the second finish forging treatment is the ending point in the first finish forging treatment; the "length direction" is the direction of the central axis of the tube blank.
The structural symmetry of the two ends of the special-shaped seamless pipe is as follows: the middle point of the central axis of the special seamless pipe is taken as a vertical line perpendicular to the central axis, and the special seamless pipe takes the vertical line as a symmetrical axis, and the structures at the two ends are symmetrical.
In some embodiments, the surface temperature of the titanium-containing metal tube blank is controlled to be 700-1050 ℃ during the finish forging process.
The surface temperature of the titanium-containing metal tube blank in the finish forging treatment process is further regulated so as to improve the mechanical property of the tube.
In some embodiments, the preparation method of the special-shaped seamless pipe meets at least one of the following conditions (1) - (3):
(1) The temperature of the first heat treatment is 700-1050 ℃;
(2) The temperature of the second heat treatment is 500-600 ℃;
(3) The temperature of the first heat treatment is greater than the temperature of the second heat treatment.
The temperature of the first heat treatment and the temperature of the second heat treatment are further regulated and controlled, the first heat treatment is carried out under the condition of higher temperature, and meanwhile, the organization structure of the pipe can be further refined by combining the second heat treatment with lower temperature, so that the mechanical strength of the special-shaped seamless pipe is improved.
In some embodiments, the diameter of the outer diameter of the special-shaped seamless pipe is changed into one step at a time, in the step of finish forging treatment, the forging speed of the first step is 2-3 m/min, and the forging speed of the subsequent steps is 1-2 m/min.
In some embodiments, the drawing forging process includes the steps of:
sequentially performing cogging forging and multi-firing upsetting on the titanium-containing metal ingot at a first heating temperature to prepare a prefabricated titanium-containing metal rod blank; the first heating temperature is greater than the transformation point temperature of the titanium-containing metal ingot;
performing multi-fire upsetting on the prefabricated titanium-containing metal rod blank at a second heating temperature to prepare the titanium-containing metal rod blank; the second heating temperature is less than the phase transition point temperature of the prefabricated titanium-containing metal rod blank.
Firstly, cogging and forging above the transformation point of the titanium-containing metal ingot, carrying out multi-firing upsetting and pulling to improve the homogenization degree of the structure, and then, carrying out multi-firing upsetting and pulling below the transformation point of the prefabricated titanium-containing metal rod blank to fully crush and refine the large structure in the as-cast state, thereby further improving the uniformity and mechanical property of the structure.
In some embodiments, the first heating temperature is 900-1150 ℃ and the second heating temperature is 700-1000 ℃.
In some embodiments, the perforation process includes a centering through hole process and a thermal perforation process performed sequentially, and the thermal perforation process satisfies at least one of the following conditions (4) - (5):
(4) The step of heat perforation treatment is carried out at 900-1150 ℃ by adopting oblique rolling perforation;
(5) In the step of the heat perforation treatment, the outer diameter expansion rate is 2% -10%, the rolling reduction rate is 8% -10.5%, and the tube blank elongation coefficient is 1.2% -2.5.
In some of these embodiments, the composition of the titanium-containing metal ingot comprises at least one of an alpha titanium alloy, an alpha + beta titanium alloy, and a beta titanium alloy.
Another aspect of the present application provides a shaped seamless pipe, which is manufactured by the method for manufacturing a shaped seamless pipe as described above.
Drawings
Fig. 1 (a) is a schematic view of a seamless pipe shaped in an asymmetric structure according to some embodiments of the present invention, fig. 1 (b) is a schematic view of a seamless pipe shaped in an asymmetric structure according to other embodiments of the present invention, and fig. 1 (c) is a schematic view of a seamless pipe shaped in an asymmetric structure according to still other embodiments of the present invention;
fig. 2 (a) is a schematic diagram of a symmetrical shaped seamless pipe according to some embodiments of the present invention, fig. 2 (B) is a schematic diagram of a symmetrical shaped seamless pipe according to other embodiments of the present invention, and fig. 2 (C) is a schematic diagram of a symmetrical shaped seamless pipe according to still other embodiments of the present invention.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the invention are given in the detailed description. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
In one embodiment of the application, a method for preparing a special-shaped seamless pipe is provided, which comprises the following steps S10-S40.
Step S10: and drawing and forging the titanium-containing metal cast ingot according to the designed special-shaped seamless pipe shape to prepare a titanium-containing metal rod blank.
It can be understood that the shape and the size of the special-shaped seamless pipe are designed according to the practical application, and the drawing forging treatment is carried out on the titanium-containing metal cast ingot based on the shape and the size of the special-shaped seamless pipe, so that the outer surface of the preliminarily formed titanium-containing metal rod blank is in the shape and the size which are preliminarily matched with the shape of the designed special-shaped seamless pipe.
In some embodiments, the drawing forging process in step S10 includes the following steps S11 to S12.
Step S11, sequentially performing cogging forging and multi-firing upsetting on the titanium-containing metal cast ingot at a first heating temperature to prepare a prefabricated titanium-containing metal rod blank; the first heating temperature is greater than the transformation point temperature of the titanium-containing metal ingot.
Step S12, upsetting and drawing the prefabricated titanium-containing metal rod blank for multiple times at a second heating temperature to prepare a preliminarily formed titanium-containing metal rod blank; the second heating temperature is less than the transformation point temperature of the prefabricated titanium-containing metal rod blank.
Firstly, cogging and forging above the transformation point of the titanium-containing metal ingot, carrying out multi-firing upsetting and pulling to improve the homogenization degree of the structure, and then, carrying out multi-firing upsetting and pulling below the transformation point of the prefabricated titanium-containing metal rod blank to fully crush and refine the large structure in the as-cast state, thereby further improving the uniformity and mechanical property of the structure.
In some embodiments, the first heating temperature is 900-1150 ℃ and the second heating temperature is 700-1000 ℃.
And step S20, perforating the titanium-containing metal rod blank to prepare a preformed hollow titanium-containing metal tube blank.
In some of these embodiments, the perforation process includes a centering through-hole process and a thermal perforation process that are performed sequentially.
In some embodiments, the step of heat piercing is performed at 900-1150 ℃ using cross-rolling piercing.
In some embodiments, in the step of heat perforation treatment, the outer diameter expansion rate is 2% -10%, the rolling reduction rate is 8% -10.5%, and the tube blank elongation coefficient is 1.2% -2.5.
In some of these embodiments, in the step of heat-piercing, the step of cooling the heat-pierced product is further included; specifically, air cooling is used for cooling.
Further, after the cooling step, the method further comprises the steps of sequentially inspecting the product, removing defects, sampling and detecting and sawing the length to a certain extent so as to further ensure the precision of the product.
Step S30, inserting a rod core into a hollow pipeline of the titanium-containing metal pipe blank, and then performing finish forging on the titanium-containing metal pipe blank, wherein the finish forging direction of the finish forging is from one end to the other end of the titanium-containing metal pipe blank in the length direction, so as to prepare a finish forged titanium-containing metal pipe; in the process of finish forging treatment, the surface temperature of the titanium-containing metal tube blank is controlled to be 600-1050 ℃.
Namely, performing finish forging treatment from one end to the other end of the titanium-containing metal tube blank in the length direction to obtain one-time finish forging treatment, and preparing a finish-forged titanium-containing metal tube; in the process of finish forging treatment, the surface temperature of the titanium-containing metal tube blank is controlled to be 600-1050 ℃.
Specifically, the rod core is a normal-pressure rod core for precision forging, and the shape and the size of the rod core can be correspondingly designed and adjusted according to the designed pipeline shape of the special-shaped seamless pipe.
It can be understood that in the process of precision forging control treatment, the surface temperature of the titanium-containing metal tube blank is too high, so that the structure of each part of the tube blank is coarse, the mechanical property and ultrasonic flaw detection are adversely affected, and when the temperature is too low, the deformation resistance of the tube blank is obviously increased, the plastic deformation capability is reduced, cracks are easy to appear, and the mechanical property and the yield of products are reduced.
In some embodiments, the structures at two ends of the special-shaped seamless pipe are symmetrical, the number of times of finish forging treatment is at least two, and the finish forging directions of two adjacent finish forging treatments are opposite.
Further, in the adjacent two precision forging processes, the insertion directions of the rod cores are also opposite.
When the structures at the two ends of the special-shaped seamless pipe are symmetrical, finish forging treatment with opposite finish forging directions is performed twice, so that the structural uniformity and the dimensional accuracy of the structural symmetrical pipe are further improved.
It can be understood that the first finish forging treatment is performed from one end to the other end in the length direction of the titanium-containing metal pipe blank, and the starting point in the second finish forging treatment is the ending point in the first finish forging treatment; the "length direction" is the direction of the central axis of the tube blank.
The structural symmetry of the two ends of the special-shaped seamless pipe is as follows: the middle point of the central axis of the special seamless pipe is taken as a vertical line perpendicular to the central axis, and the special seamless pipe takes the vertical line as a symmetrical axis, and the structures at the two ends are symmetrical. The schematic diagram of the special-shaped seamless pipe with the symmetrical structure is shown in fig. 2 (A) - (C), and the schematic diagram of the special-shaped seamless pipe with the asymmetrical structure is shown in fig. 1 (a) - (C).
In some embodiments, multiple hot precision forging is performed during the single precision forging process.
It can be understood that: the above-mentioned finish forging treatment process from one end to the other end in the longitudinal direction of the titanium-containing metal pipe blank is referred to as "one-time finish forging treatment", in which multiple-time finish forging, that is, multiple-time heating forging may be performed, so that the surface temperature of the titanium-containing metal pipe blank is maintained within a specific range during the finish forging treatment.
In some embodiments, the surface temperature of the titanium-containing metal tube blank is controlled to be 700-1050 ℃ in the process of finish forging treatment.
The surface temperature of the titanium-containing metal tube blank in the finish forging treatment process is further regulated so as to improve the mechanical property of the tube.
In the above "700 ℃ to 1050 ℃, the values include the minimum value and the maximum value of the range, and each value between the minimum value and the maximum value, and specific examples include, but are not limited to, the point values in the embodiments and the following point values: 700 ℃, 750 ℃, 800 ℃, 850 ℃, 900 ℃, 950 ℃, 1000 ℃, 1050 ℃; or a range of any two values, for example, 700 to 1050 ℃, 750 to 1050 ℃, 800 to 1050 ℃, 850 to 1050 ℃, 900 to 1050 ℃, 950 to 1050 ℃, 700 to 1000 ℃, 750 to 1000 ℃, 800 to 1000 ℃, 850 to 1000 ℃, 900 to 1000 ℃, 950 to 1000 ℃.
In some embodiments, in the step of finish forging treatment, the inner diameter of the special-shaped seamless pipe is changed into one step at a time, the forging speed of the first step is 2-3 m/min, and the forging speed of the subsequent steps is 1-2 m/min.
It can be understood that the outer diameter change means that the outer diameter is changed, the inner diameter change of the special-shaped seamless pipe is one step at a time, in the step of primary finish forging treatment, the area from one end to the inner diameter change is a first step, and the rest part is a subsequent step; further, the subsequent steps may comprise 1 or more steps depending on the shape of the shaped seamless pipe of the particular desired design.
In some of these embodiments, in each step of the finish forging process, the forging speed of the first step is greater than the forging speed of the subsequent step.
S40, performing primary heat treatment on the titanium-containing metal pipe subjected to finish forging; and (3) performing water cooling treatment on the titanium-containing metal pipe subjected to the first heat treatment until the surface temperature of the titanium-containing metal pipe is reduced to 500-600 ℃, placing the titanium-containing metal pipe in air for 1-5 min, continuing performing water cooling treatment until the surface temperature of the titanium-containing metal pipe is reduced to 200-300 ℃, and then sequentially performing air cooling treatment and second heat treatment to prepare the special-shaped seamless pipe.
In the method for preparing the special-shaped seamless pipe, the drawing forging treatment and the perforation treatment are sequentially carried out to prepare the titanium-containing metal pipe blank, then the finish forging treatment is carried out, and the surface temperature of the titanium-containing metal pipe blank in the finish forging treatment process is controlled, so that the tissue structures of all parts of the pipe are grown to proper sizes and simultaneously the good plastic deformation capacity is maintained, the mechanical property of the pipe is improved, and the occurrence probability of cracks of the pipe is reduced; and performing water cooling treatment to a specific surface temperature after performing primary heat treatment on the finish-forged titanium-containing metal pipe, stopping the water cooling treatment, and placing in the air for a specific time to enable the internal temperature and the surface temperature of the titanium-containing metal pipe to be subjected to temperature returning buffering for a specific time, enabling the internal temperature and the surface temperature of the titanium-containing metal pipe to be consistent, continuing to perform water cooling treatment to a specific temperature, performing air cooling, performing secondary heat treatment again, and reducing the probability of reducing the structural uniformity of the special-shaped seamless pipe due to different cooling degrees of different positions of the surface and the internal of the titanium-containing metal pipe, thereby improving the structural uniformity of the special-shaped seamless pipe and having excellent mechanical strength and toughness.
Meanwhile, in the preparation method, the drawing forging treatment and the perforation treatment are sequentially carried out to prepare the titanium-containing metal tube blank, then the finish forging treatment is carried out, the inner diameter and the outer diameter of the tube can be adjusted only by adjusting the size of a rod core and the finish forging technological parameters during finish forging, and the prepared special-shaped seamless tube is high in size precision and high in yield.
In some of these embodiments, the temperature of the first heat treatment is greater than the temperature of the second heat treatment.
In some embodiments, the temperature of the first heat treatment is 700 ℃ to 1050 ℃.
In some of these embodiments, the second heat treatment is greater than or equal to 500 ℃.
In some embodiments, the second heat treatment is performed at a temperature of 500 ℃ to 700 ℃.
In some embodiments, the second heat treatment is performed at a temperature of 500 ℃ to 600 ℃.
The temperature of the first heat treatment and the temperature of the second heat treatment are further regulated and controlled, the first heat treatment is carried out under the condition of higher temperature, and meanwhile, the organization structure of the pipe can be further refined by combining the second heat treatment with lower temperature, so that the mechanical strength of the special-shaped seamless pipe is improved.
In some embodiments, the first heat treatment is performed for 60min to 180min.
In some embodiments, the second heat treatment is performed for 120min to 480min.
In some embodiments, in step S50, the surface temperature of the titanium-containing metal pipe is 700 ℃ to 850 ℃ when the titanium-containing metal pipe is extracted from water and placed in air.
In the water cooling process, the cooling rates of the surface and the interior of the titanium-containing metal pipe are different, the surface temperature is low, the internal temperature is higher, the temperature difference between the surface and the interior is increased, and the titanium-containing metal pipe is placed in the air for a specific time, so that the internal temperature and the surface temperature of the titanium-containing metal pipe are subjected to tempering buffering for a specific time, the surface temperature is increased, the internal temperature is reduced, and the internal temperature and the surface temperature of the titanium-containing metal pipe tend to be consistent.
In some embodiments, in the water cooling process, the temperature of the water may be a normal temperature environment temperature, and specifically may be 10 ℃ to 30 ℃.
Further, the product is directly placed in the air at normal temperature during air cooling treatment; specifically, the temperature can be 10-30 ℃.
In some of these embodiments, after the step of second heat treating, a step of air cooling is further included.
In some of these embodiments, the composition of the titanium-containing metal ingot comprises at least one of an alpha titanium alloy, an alpha + beta titanium alloy, and a beta titanium alloy.
The alpha titanium alloy, alpha + beta titanium alloy, and beta titanium alloy may be of the type commonly used in the art, including for example but not limited to those referred to in standards GB/T3620.1-2007, GB/T3624-2010; specific examples include, but are not limited to, this range: TA6 (Ti-5 Al), TA7 (Ti-5 Al-2.5 Sn), TA9 (Ti-0.2 Pa), TA10 (Ti-0.3 Mo-0.8 Ni), TA13 (Ti-2.5 Cu), TA16 (Ti-2 Al-2.5 Zr), TA17 (Ti-4 Al-2.5V), TA18 (Ti-3 Al-2.5V), TA20 (Ti-4 Al-3V-1.5 Zr) and TA24 (Ti-3 Al-2 Mo-Zr), TB3 (Ti-3.5 Al-10Mo-8V-1 Fe), TB4 (Ti-4 Al-7Mo-10V-2Fe-1 Zr), TB5 (Ti-15V-3 Cr-3Sn-3 Al), TB6 (Ti-10V-2 Fe-3 Al), TB8 (Ti-15 Mo-2.7Nb-3Al-0.2 Si) and TB 24 (Ti-3 Al-8V-6Cr-4 Zr), TB4, TC6, ti-6A, and TC 6.
Another aspect of the present application provides a shaped seamless pipe manufactured by the method for manufacturing a shaped seamless pipe as described above.
The special-shaped seamless pipe has high uniformity of tissue structure and excellent mechanical property, and is beneficial to the application in the fields of aerospace, ship, ocean engineering, ocean exploration and the like.
It should be noted that, from the aspect of shape, the special-shaped seamless pipe is an irregular-shaped pipe, and from the aspect of structure, two main types are provided: non-circular special-shaped seamless pipes and circular special-shaped seamless pipes, wherein at least one cross section of the non-circular special-shaped seamless pipes is non-circular in the central axis direction, and refer to (c) in fig. 1.
The cross sections of the circular special-shaped seamless pipes are circular, but the diameters of at least two cross sections in the central axis direction are different, and refer to (a) - (C) in fig. 1 and (A) - (C) in fig. 2.
Further, non-circular includes, but is not limited to: oval, triangular, hexagonal, diamond, octagonal, semicircular, scalene hexagonal, quincuncial, biconvex, biconcave, melon seed, conical, corrugated, rectangular, etc.
The cross section of the special seamless pipe can be divided into a special seamless pipe with equal wall thickness, a special seamless pipe with unequal wall thickness and a special seamless pipe with variable diameter, which are not repeated herein.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The following are specific examples.
Example 1
(1) Selecting an alpha+beta two-phase titanium alloy Ti62A titanium alloy, cutting raw materials according to the specification requirements of finished pipes to obtain titanium alloy ingots, cogging and forging the cut titanium alloy ingots at a heating temperature (1050-1150 ℃) above the phase transition point, performing multiple-firing upsetting, and performing multiple-firing upsetting at a heating temperature (900-950 ℃) below the phase transition point to obtain preliminarily formed titanium-containing metal rod blanks.
(2) And machining a centering through hole on the preliminarily formed titanium-containing metal rod blank, and then heating at 1000 ℃ to perform hot-cross rolling perforation, wherein the outer diameter expansion rate is 3%, the rolling reduction is 10%, and the tube blank elongation coefficient is 2.2, so that the hollow preformed titanium-containing metal tube blank is obtained.
(3) Inserting a special-shaped core rod into a preformed titanium-containing metal tube blank pipeline, heating the titanium-containing metal tube blank to enable the surface temperature to be 940 ℃, performing first precision forging from one end to the other end in the length direction of the titanium-containing metal tube blank, returning the tube blank to the furnace to heat to 940 ℃ when the surface temperature of the titanium-containing metal tube blank is lower than 700 ℃, performing single-direction first precision forging to perform multiple-fire precision forging, and keeping the surface temperature of the titanium-containing metal tube blank at 700-940 ℃ in the whole precision forging process, wherein the forging speed of a first step is 2.4m/min, and the forging speed of a subsequent step is 1.4m/min until the precision forging treatment is completed, so that the precision forged titanium-containing metal tube is obtained.
(4) Carrying out heat preservation on the finish-forged titanium-containing metal pipe for 120min at 930 ℃, lifting the finish-forged titanium-containing metal pipe to a room temperature cooling tank for water cooling, when the surface temperature of the titanium-containing metal pipe is 600 ℃, extracting the titanium-containing metal pipe from the water, placing the titanium-containing metal pipe in the air, stopping water cooling for 2.5min, then placing the titanium-containing metal pipe in the cooling tank again for water cooling, when the surface temperature of the titanium-containing metal pipe is 300 ℃, stopping water cooling, placing the titanium-containing metal pipe in the room temperature environment for air cooling, and obtaining the titanium-containing metal pipe after the first heat treatment;
and (3) carrying out heat preservation on the titanium-containing metal pipe subjected to the first heat treatment for a second heat treatment for 240min at 540 ℃, and then placing the pipe in a room temperature environment for air cooling to obtain a titanium alloy special-shaped seamless pipe, wherein the schematic diagram of the finished pipe is shown in (a) in fig. 1.
(5) Testing
1. Sampling the surface of the head, middle and tail areas of the finished pipe and the tissue type in the core, and observing under a microscope to judge whether the tissue types are consistent. The specific results are shown in Table 1.
2. The tensile strength and the yield strength of the finished pipe are tested and the elongation is tested according to the standard GB/T228.1. The specific results are shown in Table 1.
Example 2
(1) And selecting an alpha+beta two-phase titanium alloy Ti62A titanium alloy, and cutting the raw materials according to the specification requirements of finished pipes to obtain titanium alloy ingots, wherein the schematic diagram of the finished pipes is shown in (A) of fig. 2.
Cogging and forging the cut titanium alloy ingot at a heating temperature of 1050-1150 ℃ above the phase transition point, performing multi-firing upsetting, and performing multi-firing upsetting at a heating temperature of 900-950 ℃ below the phase transition point to obtain a primary formed titanium-containing metal rod blank.
(2) And machining a centering through hole on the preliminarily formed titanium-containing metal rod blank, and then heating at 1000 ℃ to perform hot-cross rolling perforation, wherein the outer diameter expansion rate is 3%, the rolling reduction is 10%, and the tube blank elongation coefficient is 2.2, so that the hollow preformed titanium-containing metal tube blank is obtained.
(3) Inserting a special-shaped core rod into a pipeline of a preformed titanium-containing metal tube blank from one end, heating the titanium-containing metal tube blank to enable the surface temperature to be 940 ℃, performing primary finish forging from one end to the other end in the length direction of the titanium-containing metal tube blank, returning the tube blank to the furnace to heat to 940 ℃ when the surface temperature of the titanium-containing metal tube blank is lower than 700 ℃, performing primary finish forging in one direction, and performing multiple times of finish forging, wherein the surface temperature of the titanium-containing metal tube blank is kept at 700-940 ℃ in the whole finish forging process, the forging speed of a first step is 2.4m/min, and the forging speed of a subsequent step is 1.4m/min until the primary finish forging treatment is completed.
And then inserting the special-shaped core rod into the titanium-containing metal pipe from the other end of the titanium-containing metal pipe, and performing secondary finish forging according to the condition of the primary finish forging by taking the end point of the primary finish forging as a starting point, namely, performing the secondary finish forging in opposite directions to obtain the finish-forged titanium-containing metal pipe.
(4) Carrying out first heat preservation and heat treatment on the finish-forged titanium-containing metal pipe for 120min at 930 ℃, lifting the pipe to a room-temperature cooling pool for water cooling, when the surface temperature of the titanium-containing metal pipe is 600 ℃, extracting the titanium-containing metal pipe from the water, placing the pipe in the air, stopping water cooling for 2.5min, then placing the pipe in the cooling pool again for water cooling, when the surface temperature of the titanium-containing metal pipe is 300 ℃, stopping water cooling, placing the pipe in the room-temperature environment for air cooling, and obtaining the titanium-containing metal pipe after the first heat treatment;
and (3) carrying out heat preservation on the titanium-containing metal pipe subjected to the first heat treatment at 540 ℃ for 240min, and then placing the pipe in a room temperature environment for air cooling to obtain the titanium alloy special-shaped seamless pipe.
(5) And (3) testing: refer to example 1, step (5).
Example 3
(1) Selecting beta-phase titanium alloy: and cutting the raw materials to obtain a titanium alloy cast ingot according to the specification requirements of the finished pipe, wherein the schematic diagram of the finished pipe is shown in (a) of fig. 1.
Cogging and forging the cut titanium alloy ingot at a heating temperature of 1000-1050 ℃ above the heating value phase transition point, performing multi-firing upsetting, and performing multi-firing upsetting at a heating temperature of 700-800 ℃ below the phase transition point to obtain a primary formed titanium-containing metal rod blank.
(2) And machining a centering through hole on the preliminarily formed titanium-containing metal rod blank, and then heating at 950 ℃ to perform hot-cross rolling perforation, wherein the outer diameter expansion rate is 3%, the rolling reduction is 9%, and the tube blank elongation coefficient is 1.8, so that the hollow preformed titanium-containing metal tube blank is obtained.
(3) Inserting a special-shaped core rod into a pipeline of a preformed titanium-containing metal tube blank from one end, heating the titanium-containing metal tube blank to enable the surface temperature to be 800 ℃, performing primary finish forging from one end to the other end in the length direction of the titanium-containing metal tube blank, returning the tube blank to the furnace to raise the temperature to 800 ℃ when the surface temperature of the titanium-containing metal tube blank is lower than 650 ℃, performing primary finish forging in one direction, and performing multiple times of finish forging, wherein the surface temperature of the titanium-containing metal tube blank is kept at 650-800 ℃ in the whole finish forging process, the forging speed of a first step is 2m/min, and the forging speed of a subsequent step is 1.1m/min until the primary finish forging treatment is completed, so that the finish forged titanium-containing metal tube is obtained.
(4) Carrying out primary heat treatment on the finish-forged titanium-containing metal pipe for 60min at 800 ℃, lifting the finish-forged titanium-containing metal pipe to a room temperature cooling tank for water cooling, when the surface temperature of the titanium-containing metal pipe is 500 ℃, extracting the titanium-containing metal pipe from the water, placing the titanium-containing metal pipe in the air, stopping water cooling for 2.5min, then placing the titanium-containing metal pipe in the cooling tank again for water cooling, when the surface temperature of the titanium-containing metal pipe is 300 ℃, stopping water cooling, placing the titanium-containing metal pipe in the room temperature environment for air cooling, and obtaining the titanium-containing metal pipe after primary heat treatment;
and (3) carrying out heat preservation on the titanium-containing metal pipe subjected to the first heat treatment for a second heat treatment for 120min at 550 ℃, and then placing the pipe in a room temperature environment for air cooling to obtain the titanium alloy special-shaped seamless pipe.
(5) And (3) testing: refer to example 1, step (5).
Example 4
(1) And selecting a beta-phase titanium alloy TB5 titanium alloy, and cutting the raw materials according to the specification requirements of finished pipes to obtain titanium alloy ingots, wherein the schematic diagram of the finished pipes is shown in (B) of fig. 2.
Cogging and forging the cut titanium alloy ingot at a heating temperature of 1000-1050 ℃ above the heating value phase transition point, performing multi-firing upsetting, and performing multi-firing upsetting at a heating temperature of 700-800 ℃ below the phase transition point to obtain a primary formed titanium-containing metal rod blank.
(2) And machining a centering through hole on the preliminarily formed titanium-containing metal rod blank, and then heating at 1000 ℃ to perform hot-cross rolling perforation, wherein the outer diameter expansion rate is 3%, the rolling reduction is 10%, and the tube blank elongation coefficient is 2.2, so that the hollow preformed titanium-containing metal tube blank is obtained.
(3) Inserting a special-shaped core rod into a pipeline of a preformed titanium-containing metal tube blank from one end, heating the titanium-containing metal tube blank to enable the surface temperature to be 800 ℃, performing primary finish forging from one end to the other end in the length direction of the titanium-containing metal tube blank, returning the tube blank to the furnace to raise the temperature to 800 ℃ when the surface temperature of the titanium-containing metal tube blank is lower than 650 ℃, performing primary finish forging in one direction, and performing multiple times of finish forging, wherein the surface temperature of the titanium-containing metal tube blank is kept at 650-800 ℃ in the whole finish forging process, the forging speed of a first step is 2m/min, and the forging speed of a subsequent step is 1.1m/min until the primary finish forging treatment is completed.
And then inserting the special-shaped core rod into the titanium-containing metal pipe from the other end of the titanium-containing metal pipe, and performing secondary finish forging according to the condition of the primary finish forging by taking the end point of the primary finish forging as a starting point, namely, performing the secondary finish forging in opposite directions to obtain the finish-forged titanium-containing metal pipe.
(4) Carrying out primary heat treatment on the finish-forged titanium-containing metal pipe for 60min at 800 ℃, lifting the finish-forged titanium-containing metal pipe to a room temperature cooling tank for water cooling, when the surface temperature of the titanium-containing metal pipe is 500 ℃, extracting the titanium-containing metal pipe from the water, placing the titanium-containing metal pipe in the air, stopping water cooling for 2.5min, then placing the titanium-containing metal pipe in the cooling tank again for water cooling, when the surface temperature of the titanium-containing metal pipe is 300 ℃, stopping water cooling, placing the titanium-containing metal pipe in the room temperature environment for air cooling, and obtaining the titanium-containing metal pipe after primary heat treatment;
and (3) carrying out heat preservation on the titanium-containing metal pipe subjected to the first heat treatment for a second heat treatment for 120min at 550 ℃, and then placing the pipe in a room temperature environment for air cooling to obtain the titanium alloy special-shaped seamless pipe.
(5) And (3) testing: refer to example 1, step (5).
Examples 5 to 6
Examples 5 to 6 are basically the same as example 1, except that: in the step (4) of the example 5, the titanium-containing metal pipe is extracted from the water and placed in the air to stop water cooling for 1min, and in the step (4) of the example 6, the titanium-containing metal pipe is extracted from the water and placed in the air to stop water cooling for 5min.
Other process conditions were the same as in example 1.
Example 7
Example 7 is substantially the same as example 1, except that: the temperature of the first heat treatment and the second heat treatment in step (4) of example 7 were 700 ℃.
Other process conditions were the same as in example 1.
Comparative example 1
Comparative example 1 is substantially the same as example 1 except that: in the step (3), the surface temperature of the heated titanium-containing metal tube blank is kept at 550-590 ℃ in the whole finish forging process.
Other process conditions were the same as in example 1.
Comparative example 2
Comparative example 1 is substantially the same as example 1 except that: in the step (5), the titanium-containing metal pipe after the first heat treatment is lifted to a room temperature cooling pool for water cooling and is directly cooled to the surface temperature of 300 ℃, water cooling is stopped, and the titanium-containing metal pipe after the first heat treatment is obtained after air cooling is performed in a room temperature environment.
Other process conditions were the same as in example 1.
The test results of each example and comparative example are shown in Table 1.
TABLE 1
Note that: "/" cannot be correlated to obtain data.
By analyzing the data in table 1 and the test results of comparative examples 1 and 1-2, the specific preparation steps in the application can improve the structural uniformity of the special-shaped seamless pipe, and have excellent mechanical strength and toughness. Wherein, the temperature in the finish forging process in comparative example 1 is too low, the plastic deformation capability of the titanium-containing metal pipe is poor, the deformation resistance is large, the finish forging forming of the pipe can not be basically realized, the pipe is severely cracked, the pipe is scrapped, and the related performance can not be tested; in comparative example 2, the whole process adopts a water cooling mode, the cooling rate of the pipe is high on the whole, the strength is increased, but the temperature difference of the pipe is large in each part in the cooling process, the structure type is uneven, the plasticity is poor, the toughness is reduced, and the excellent strength and toughness cannot be achieved.
Further, according to the test results of example 1 and example 7, it is known that in the above preparation method, the strength of the pipe can be further improved by controlling the temperature of the heat treatment twice.
In the preparation method, the drawing forging treatment, the centering through hole treatment and the hot punching treatment are sequentially carried out to prepare the titanium-containing metal tube blank, then the finish forging treatment is carried out, the inner diameter and the outer diameter of the tube can be adjusted only by adjusting the rod core size and the finish forging technological parameters during finish forging, and the size precision and the yield of the prepared special-shaped seamless tube are high.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The preparation method of the special-shaped seamless pipe is characterized by comprising the following steps of:
according to the shape of the designed special-shaped seamless pipe, sequentially carrying out drawing forging treatment and perforation treatment on the titanium-containing metal cast ingot to prepare a hollow titanium-containing metal pipe blank;
inserting a rod core into the hollow pipeline of the titanium-containing metal tube blank,
then carrying out finish forging treatment on the titanium-containing metal tube blank, wherein the finish forging direction of the finish forging treatment is from one end to the other end in the length direction of the titanium-containing metal tube blank, and preparing a finish forged titanium-containing metal tube; in the process of finish forging treatment, controlling the surface temperature of the titanium-containing metal tube blank to be 600-1050 ℃;
performing primary heat treatment on the titanium-containing metal pipe, performing water cooling treatment on the titanium-containing metal pipe subjected to the primary heat treatment until the surface temperature of the titanium-containing metal pipe is reduced to 500-600 ℃, placing the titanium-containing metal pipe in air for 1-5 min, continuing performing water cooling treatment until the surface temperature of the titanium-containing metal pipe is reduced to 200-300 ℃, and then sequentially performing air cooling treatment and secondary heat treatment to prepare the special-shaped seamless pipe.
2. The method for producing a seamless pipe according to claim 1, wherein the two ends of the seamless pipe are symmetrical in structure, the number of finish forging is at least two, and the finish forging directions of the adjacent two finish forging are opposite.
3. The method for producing a seamless pipe according to claim 1, wherein the surface temperature of the titanium-containing metal pipe blank is controlled to 700 ℃ to 1050 ℃ during the finish forging treatment.
4. The method for preparing the special-shaped seamless pipe according to any one of claims 1 to 3, wherein the method for preparing the special-shaped seamless pipe meets at least one of the following conditions (1) to (3):
(1) The temperature of the first heat treatment is 700-1050 ℃;
(2) The temperature of the second heat treatment is 500-600 ℃;
(3) The temperature of the first heat treatment is greater than the temperature of the second heat treatment.
5. The method for producing a seamless pipe according to any one of claims 1 to 3, wherein the diameter of the seamless pipe is changed to one step at a time, and in the step of finish forging, the forging speed of the first step is 2m/min to 3m/min, and the forging speed of the subsequent step is 1m/min to 2m/min.
6. The method for preparing the special-shaped seamless pipe according to any one of claims 1 to 3, wherein the drawing forging process comprises the following steps:
sequentially performing cogging forging and multi-firing upsetting on the titanium-containing metal ingot at a first heating temperature to prepare a prefabricated titanium-containing metal rod blank; the first heating temperature is greater than the transformation point temperature of the titanium-containing metal ingot;
performing multi-fire upsetting on the prefabricated titanium-containing metal rod blank at a second heating temperature to prepare the titanium-containing metal rod blank; the second heating temperature is less than the phase transition point temperature of the prefabricated titanium-containing metal rod blank.
7. The method for producing a seamless pipe according to claim 6, wherein the first heating temperature is 900 ℃ to 1150 ℃ and the second heating temperature is 700 ℃ to 1000 ℃.
8. The method for producing a seamless pipe according to any one of claims 1 to 3, wherein the piercing process comprises a centering through-hole process and a heat piercing process performed in this order, the heat piercing process satisfying at least one of the following conditions (4) to (5):
(4) The step of heat perforation treatment is carried out at 900-1150 ℃ by adopting oblique rolling perforation;
(5) In the step of the heat perforation treatment, the outer diameter expansion rate is 2% -10%, the rolling reduction rate is 8% -10.5%, and the tube blank elongation coefficient is 1.2% -2.5.
9. The method for producing a shaped seamless pipe according to any one of claims 1 to 3, wherein the components of the titanium-containing metal ingot include at least one of an α -type titanium alloy, an α+β -type titanium alloy, and a β -type titanium alloy.
10. A special-shaped seamless pipe, characterized in that the special-shaped seamless pipe is manufactured by adopting the manufacturing method of the special-shaped seamless pipe according to any one of claims 1-9.
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