A method for manufacturing a cold-rolled pipe of TA24 titanium alloy for a ship

Abstract

The application discloses a kind of manufacturing methods of TA24 titanium alloy cold-rolled pipe for ship, which comprises the following steps: one, TA24 titanium alloy ingot forging preparation bar blank;Two, after bar blank drilling, sleeve is carried out hot extrusion to obtain extruded tube blank;Step three, extruded tube blank is shaped and rolled, inner and outer surface treatment and heat treatment are obtained to obtain rolled tube blank;Four, cold rolling, intermediate pass heat treatment and inner surface sand blasting treatment and pickling treatment;Five, cold rolling is obtained to obtain finished size pipe;Six, finished heat treatment, straightening and ultrasonic flaw detection are obtained to obtain TA24 titanium alloy cold-rolled pipe.The application strictly controls the chemical composition of bar blank, extrusion and cold rolling process, heat treatment system and surface treatment, solves the problem of cold rolling processing crack and cracking, ensures the smooth progress of cold rolling process, and prepares TA24 titanium alloy cold-rolled pipe with excellent mechanical properties and stable surface quality, meets the requirements of ship use, and the quality is stable, operability is strong, and is suitable for promotion.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of metal material processing, and particularly relates to a manufacturing method of TA24 titanium alloy cold-rolled pipe for ships. BACKGROUND

[0002] TA24 (also known as Ti75) is a near-alpha titanium alloy, and its nominal chemical composition is Ti-3Al-2Mo-2Zr. It is the first 730MPa-grade ship titanium alloy independently developed by China, has the characteristics of medium strength, high toughness, corrosion resistance, hydrogen embrittlement resistance and weldability, and has better comprehensive performance than the same grade ship titanium alloys at home and abroad, and has a wide application prospect in the fields of ships, petroleum and chemical industry. In the field of ships, TA24 is applied to power device equipment, ship welding structural parts, reciprocating salt water pumps, sea water systems, sea water four-way valves, connecting pipes and side double seats, double ball valve stems and the like, and is applied to a submarine two-loop system.

[0003] The smelting, forging, bar and plate processing technologies of TA24 titanium alloy have become mature, and the demand for pipe materials has gradually increased. At present, there are more researches and literatures on the forging and bar of TA24 titanium alloy in China, but there are few literatures on pipe manufacturing technology, and almost no cold-rolled pipe, because the strength of TA24 titanium alloy is high, the cold workability is poor, and it is difficult to process pipe by cold rolling.

[0004] At present, the main production methods of TA24 titanium alloy pipe are hot extrusion, forging bar drilling and cross piercing. The three methods are all hot machining to pipe blanks and then machining to finished product size, and each has its own limitations. The bar drilling method can machine most of the pipe with good performance, but the length of the pipe is short, the yield is low, and the cost is high. The TA24 pipe produced by the extrusion method has good performance, but it is difficult to machine long and thin-walled pipes, and the cost is high. The cross piercing method has low difficulty and low cost, but it can only produce pipes with large outer diameter (generally outer diameter ≥70mm) and thick wall, and the performance is difficult to control, the machining difficulty is large, and the surface quality is poor.

[0005] Therefore, it is necessary to develop a cold-rolling manufacturing process of TA24 titanium alloy pipe to obtain TA24 titanium alloy pipe with excellent mechanical properties and qualified length, and the process is relatively simple and has low cost. SUMMARY

[0006] The technical problem solved by the present application is to provide a manufacturing method of a TA24 titanium alloy cold-rolled pipe for ships to solve the problems of the prior art.

[0007] To solve the above technical problems, the technical scheme adopted by the present application is as follows: a manufacturing method of a TA24 titanium alloy cold-rolled pipe for ships, characterized in that the method comprises the following steps:

[0008] Step one, selecting a TA24 titanium alloy ingot obtained by three times of vacuum arc furnace melting as a raw material to prepare a rod blank by forging; the chemical composition of the rod blank meets the standard requirements of GB / T3620.1-2016 "Titanium and Titanium Alloy Grade and Chemical Composition", and the metallographic structure is equiaxed plus elongated working structure without original beta grain boundary;

[0009] Step two, drilling the rod blank prepared in step one, then sleeving, and then using an extruder to extrude after heating and holding to prepare an extruded pipe blank;

[0010] Step three, using a pipe mill to shape and roll the extruded pipe blank obtained in step two, then treating the inner and outer surfaces to remove surface defects, and then performing heat treatment to obtain a rolled pipe blank;

[0011] Step four, using an LG two-roller mill or an LD multi-roller mill to cold roll the rolled pipe blank obtained in step three, and performing intermediate pass heat treatment, and then performing inner surface sandblasting treatment and pickling treatment on the heat treated rolled pipe blank to remove inner wall defects to obtain a semi-finished pipe blank;

[0012] Step five, using an LG two-roller mill or an LD multi-roller mill to cold roll the semi-finished pipe blank obtained in step four to obtain a finished size pipe;

[0013] Step six, performing finished heat treatment on the finished size pipe obtained in step five, and then performing straightening and ultrasonic flaw detection to obtain a TA24 titanium alloy cold-rolled pipe.

[0014] The manufacturing method of the TA24 titanium alloy cold-rolled pipe for ships has the characteristics that the element composition and mass content of the rod blank in step one meet the standard requirements of GB / T3620.1-2016 “Titanium and Titanium Alloy Grade and Chemical Composition”, and the mass content of oxygen is controlled to be 0.07% to 0.11%. By limiting the oxygen content in the rod blank, it is avoided that the strength of the product pipe does not meet the standard requirements due to too low oxygen content, and it is also avoided that the pipe is prone to cracking and the flaw detection qualified rate is reduced during subsequent rolling due to too high oxygen content.

[0015] The manufacturing method of the TA24 titanium alloy cold-rolled pipe for ships has the characteristics that the double jacket form of inner steel jacket and outer copper jacket is adopted in the jacket in step two, the steel jacket is made of mild steel and has a thickness of 0.5 mm to 0.8 mm, the copper jacket is made of red copper and has a thickness of 0.7 mm to 1.2 mm, the heating temperature is (T β -30) ℃ to (T β -80) ℃, wherein T β is the phase transition point temperature in ℃, and the extruder is a 20 MN to 45 MN horizontal extruder, and the extrusion ratio for extrusion is 5 to 15.

[0016] The manufacturing method of the TA24 titanium alloy cold-rolled pipe for ships has the characteristics that the deformation amount of the shaping rolling in step three is not more than 35%, and the inner and outer surface treatment method is that the inner hole of the pipe blank after the shaping rolling is bored on one side by 0.4 mm to 0.7 mm by using a boring machine or a lathe, and the outer surface of the pipe blank after the shaping rolling is turned or ground by using a centerless lathe, a grinding machine or a planer to completely remove the defects. The present application adopts small deformation amount shaping rolling combined with surface treatment to completely remove the inner and outer surface defects of the extruded pipe blank, and avoids that the local defects of the rolled pipe blank cannot be completely removed and the defects are expanded during subsequent cold rolling by only using surface treatment.

[0017] The manufacturing method of the TA24 titanium alloy cold-rolled pipe for ships has the characteristics that the deformation amount of the shaping rolling in step three is not more than 35%, and the inner and outer surface treatment method is that the inner hole of the pipe blank after the shaping rolling is bored on one side by 0.4 mm to 0.7 mm by using a boring machine or a lathe, and the outer surface of the pipe blank after the shaping rolling is turned or ground by using a centerless lathe, a grinding machine or a planer to completely remove the defects. The present application adopts small deformation amount shaping rolling combined with surface treatment to completely remove the inner and outer surface defects of the extruded pipe blank, and avoids that the local defects of the rolled pipe blank cannot be completely removed and the defects are expanded during subsequent cold rolling by only using surface treatment.

[0018] The manufacturing method of the TA24 titanium alloy cold-rolled pipe for ships has the characteristics that the deformation amount of the shaping rolling in step three is not more than 35%, and the inner and outer surface treatment method is that the inner hole of the pipe blank after the shaping rolling is bored on one side by 0.4 mm to 0.7 mm by using a boring machine or a lathe, and the outer surface of the pipe blank after the shaping rolling is turned or ground by using a centerless lathe, a grinding machine or a planer to completely remove the defects. The present application adopts small deformation amount shaping rolling combined with surface treatment to completely remove the inner and outer surface defects of the extruded pipe blank, and avoids that the local defects of the rolled pipe blank cannot be completely removed and the defects are expanded during subsequent cold rolling by only using surface treatment.

[0019] The method for manufacturing the TA24 titanium alloy cold-rolled pipe material for ships has the following characteristics: in the fourth step, the inner surface sand blasting treatment uses 50-100 mesh sand particles, the air pressure is 0.5-1.0 MPa, and the sand blasting time is not less than 2 minutes, and the inner surface is uniform and free of visible horizontal and vertical micro-cracks and other defects.

[0020] The method for manufacturing the TA24 titanium alloy cold-rolled pipe material for ships has the following characteristics: in the fifth step, the deformation amount of the cold rolling is 30-50%, the rolling speed is not more than 50 times per minute, and the rolling feed amount is not more than 3 mm per time.

[0021] The method for manufacturing the TA24 titanium alloy cold-rolled pipe material for ships has the following characteristics: in the sixth step, the finished product heat treatment is vacuum annealing, the vacuum annealing holding temperature is 650-780 DEG C, the straightening uses a multi-roller straightening machine with more than six rollers, and the straightening method is cold straightening or warm straightening, and the warm straightening temperature is 300-520 DEG C.

[0022] Compared with the prior art, the present application has the following advantages:

[0023] 1. The present application limits the chemical composition and metallographic structure of the TA24 titanium alloy ingot prepared rod blank, ensures the good plastic processing performance of the rod blank, combines the rod blank sleeve extrusion and limits the process parameters, prepares the extruded pipe blank with good performance, and then cold-rolls the pipe blank and strictly controls the process parameters of the cold rolling, including the deformation amount, the rolling speed, the feed amount and the heat treatment system after rolling, to ensure the smooth progress of the cold rolling process, effectively solve the problems of the TA24 titanium alloy cold-rolled pipe material, such as large cold working difficulty, surface crack and even cracking during the processing, avoid the unqualified performance detection of the finished pipe material and the low detection qualified rate, and prepare the TA24 titanium alloy cold-rolled pipe material with excellent mechanical properties and stable surface quality, which meets the requirements of the ships.

[0024] 2. The present application uses the cold rolling processing method to manufacture the TA24 titanium alloy cold-rolled pipe material, controls the cold rolling process parameters to deform greatly to break the grains, and combines the heat treatment after rolling, so that the TA24 titanium alloy cold-rolled pipe material has small and uniform structure, and the mechanical properties are more excellent and stable.

[0025] 3、The present application carries out inner surface sand blasting treatment and pickling treatment on the rolled pipe blank to remove the inner surface defects generated in the processing process, improves the surface quality of the TA24 titanium alloy cold-rolled pipe material, and thus improves the ultrasonic flaw detection qualified rate of the finished TA24 titanium alloy cold-rolled pipe material.

[0026] 4、Compared with the existing hot processing, the machining difficulty of the additively manufactured thin-walled pipe material is great, and most of the materials are turned into chips, which results in huge loss. The present application directly uses the cold rolling process to the finished pipe size, has high size precision and does not need to be turned a lot, greatly improves the yield, reduces the cost, and at the same time, the manufacturing method of the present application is simple, does not need special equipment, has low manufacturing cost, and is easy to realize industrialized production.

[0027] 5、Compared with the existing hot processing mode, the present application adopts the cold rolling production mode to prepare the TA24 titanium alloy cold-rolled pipe material with an outer diameter of 6mm-114mm, a wall thickness of 1mm-10mm and a length of 3m-10m, which greatly expands the producible specification range of the TA24 titanium alloy cold-rolled pipe material and widens its application field.

[0028] The technical solutions of the present application will be further described in detail through examples. DETAILED DESCRIPTION

[0029] Example 1

[0030] The present embodiment includes the following steps:

[0031] Step one, select the TA24 titanium alloy ingot obtained by three times of vacuum arc furnace smelting as raw material to prepare a bar blank with a diameter of Φ178mm; the chemical composition, i.e. element composition and mass content of the bar blank meets the standard requirements of GB / T3620.1-2016 "Titanium and Titanium Alloy Grade and Chemical Composition", wherein the mass content of oxygen element is 0.10%-0.11%, the phase transition point is 945℃-950℃, the metallographic structure is equiaxed plus elongated processing structure without original beta grain boundary;

[0032] Step two, drill the bar blank prepared in step one, then sleeve, the sleeve adopts a double-sleeving form of inner steel skin and outer copper skin, wherein the steel skin adopts soft steel with a thickness of 0.7mm-0.8mm, the copper skin adopts red copper with a thickness of 1.0mm-1.2mm, a sleeved body is obtained, the sleeved body is heated to 900℃±15℃, then 25MN horizontal extrusion machine is used for extrusion, the extrusion ratio is 14-15, and an extruded pipe blank with a size (outer diameter x wall thickness) Φ68 ±2 mm x 9 ±1 mm is prepared.

[0033] Step three, the extruded tube blank obtained in step two is shaped-rolled using a pipe mill, with a deformation of 18% to 20%, and then the inner and outer surfaces are treated, the inner hole of the shaped-rolled tube blank is bored one side by 0.4mm to 0.5mm using a boring machine or a lathe, and the outer surface of the shaped-rolled tube blank is turned or ground using a centerless lathe, a grinder or a planer to remove defects completely, and then vacuum annealing is performed at a holding temperature of 620℃±15℃, to obtain a rolled tube blank;

[0034] Step four, the rolled tube blank obtained in step three is cold-rolled using an LG60 rolling mill for 4 passes, with a cold-rolling deformation of 27% to 52%, a rolling speed of 20 times / min to 60 times / min, and a rolling feed of 2mm / pass to 4mm / pass, vacuum annealing is performed after each pass of cold-rolling, the holding temperature is 700℃ to 780℃ when the cumulative cold-rolling deformation is greater than 30%, and the holding temperature is 600℃ to 680℃ when the cumulative cold-rolling deformation is not more than 30%, the inner surface of the rolled tube blank after vacuum annealing is sandblasted, 50 mesh to 100 mesh sand particles are used, the air pressure is 0.5MPa to 1.0MPa, the sandblasting time at each end is not less than 2min, the inner surface after sandblasting is uniform and consistent, without visible horizontal and vertical micro-cracks and other defects, and the sandblasted inner surface is treated with a mixed acid solution of HF, HNO3 and water for pickling to remove the inner wall defects, to obtain a semi-finished tube blank;

[0035] Step five, the semi-finished tube blank obtained in step four is cold-rolled using an LD40 multi-roller rolling mill, with a cold-rolling deformation of 32% to 34%, a rolling speed of 30 times / min to 50 times / min, and a rolling feed of 2mm / pass to 3mm / pass, to obtain a finished size tube with an outer diameter×wall thickness×length of Φ36mm×2mm×10000mm;

[0036] Step six, the finished size tube obtained in step five is subjected to finished heat treatment, vacuum annealing is performed using a vacuum furnace, and the holding temperature of the vacuum annealing is 760℃±10℃, then cold straightening is performed using a seven-roller straightening machine, the straightness after straightening meets the use requirements, and ultrasonic flaw detection is performed, the standard flaw meets: depth 0.2mm×width 0.8mm×length 25mm, the flaw detection qualified rate is more than 80%, and the length of a single tube is greater than 9m, to obtain a TA24 titanium alloy cold-rolled tube.

[0037] After detection, the performance of the TA24 titanium alloy cold-rolled tube prepared in this embodiment is actually measured as follows: tensile strength Rm=790MPa to 800MPa, yield strength Rp 0.2 =665MPa to 690MPa, and elongation A=20% to 22%, which fully meets the performance requirements of the standard specification: tensile strength Rm≥730MPa, yield strength Rp 0.2≥580 MPa, elongation A after fracture ≥13%.

[0038] Example 2

[0039] The embodiment comprises the following steps:

[0040] Step one, a TA24 titanium alloy ingot obtained by three vacuum arc furnace smelting is selected as a raw material to forge a Φ213 mm diameter bar; the chemical composition, i.e. element composition and mass content of the bar meets the standard requirements of GB / T3620.1-2016 "Titanium and Titanium Alloy Grade and Chemical Composition", wherein the mass content of oxygen element is 0.07% to 0.08%, the phase transition point is 935°C to 940°C, the metallographic structure is equiaxed plus elongated working structure, and there is no original β grain boundary;

[0041] Step two, the bar prepared in step one is first drilled and then sleeved, the sleeve adopts a double sleeve form of inner steel skin and outer copper skin, wherein the steel skin adopts mild steel with a thickness of 0.5 mm to 0.6 mm, and the copper skin adopts red copper with a thickness of 0.7 mm to 0.8 mm, a sleeved body is obtained, the sleeved body is heated to 870°C±15°C, and then is extruded using a 40MN horizontal extruder, an extrusion ratio of 5 to 6 is adopted, and an extruded pipe blank with a size (outer diameter x wall thickness) of Φ130 ±2 mm x 15 ±1 mm is prepared;

[0042] Step three, the extruded pipe blank obtained in step two is shaped rolled using an LG150 two-roller rolling mill, the deformation is 22% to 25%, then the inner and outer surfaces are treated, the inner hole of the shaped rolled pipe blank is bored 0.5 mm to 0.6 mm on one side using a boring machine or a lathe, the outer surface of the shaped rolled pipe blank is turned or ground using a centerless lathe, a grinding machine or a planer, and the defects are completely removed, then vacuum annealing is performed at a holding temperature of 650°C±15°C, and a rolled pipe blank is obtained;

[0043] Step four, the rolled pipe blank obtained in step three is cold rolled in two passes using an LG150 rolling mill and an LG60 rolling mill, the deformation of cold rolling is 35% and 53%, the rolling speed is 40 times / min to 60 times / min, the rolling feed is 2 mm / pass to 4 mm / pass, vacuum annealing is performed after each pass of cold rolling at holding temperatures of 700°C±15°C and 760°C±15°C respectively, the inner surface of the rolled pipe blank after vacuum annealing is sandblasted, 50 mesh to 100 mesh sand particles are adopted, the air pressure is 0.5 MPa to 1.0 MPa, the sandblasting time at each end is not less than 2 min, the inner surface after sandblasting is uniform and consistent, and there are no visible horizontal and vertical microcracks and other defects, and after sandblasting, the inner surface is treated with a mixed acid solution of HF, HNO3 and water to remove the inner wall defects, and a semi-finished pipe blank is obtained;

[0044] Step five, the semi-finished pipe blank obtained in step four is cold-rolled using a LG60 two-roller rolling mill, the deformation of the cold rolling is 48%, the rolling speed is 30 times / min~40 times / min, the rolling feed is 1mm / time~2mm / time, and a finished size pipe with an outer diameter×wall thickness×length of Φ76mm×3.5mm×8000mm is obtained;

[0045] Step six, the finished size pipe obtained in step five is subjected to finished heat treatment, vacuum annealing is performed using a vacuum furnace, and the holding temperature of the vacuum annealing is 740℃±10℃, then warm straightening is performed using a multi-roller straightening machine, the warm straightening temperature is 300℃~520℃, the straightening straightness meets the use requirements, and ultrasonic flaw detection is performed, the standard flaw meets: depth 0.35mm×width 0.8mm×length 25mm, the flaw detection qualified rate is more than 80%, the length of a single pipe is greater than 6m, and a TA24 titanium alloy cold-rolled pipe is obtained.

[0046] It is detected that the performance of the TA24 titanium alloy cold-rolled pipe prepared in the embodiment is: tensile strength Rm=800MPa~820MPa, yield strength Rp 0.2 =650MPa~670MPa, and elongation A=21%~22%, which fully meets the performance requirements of the standard specification: tensile strength Rm≥730MPa, yield strength Rp 0.2 ≥580MPa, and elongation A≥13%.

[0047] Example 3

[0048] The embodiment includes the following steps:

[0049] Step one, a TA24 titanium alloy ingot obtained by three times of vacuum arc furnace smelting is selected as a raw material to prepare a Φ273mm diameter bar blank by forging; the chemical composition, i.e., the element composition and mass content of the bar blank meets the standard requirements of GB / T3620.1-2016 “Titanium and Titanium Alloy Grade and Chemical Composition”, wherein the mass content of oxygen element is 0.08%~0.10%, the phase transition point is 940℃~945℃, the metallographic structure is equiaxed plus elongated working structure, and there is no original β grain boundary;

[0050] Step two, the bar blank prepared in step one is first drilled and then sleeved, the sleeve adopts a double sleeve form of inner steel skin and outer copper skin, wherein the steel skin adopts soft steel with a thickness of 0.5mm~0.6mm, and the copper skin adopts red copper with a thickness of 0.7mm~0.8mm, a sleeved body is obtained, the sleeved body is heated to 880℃, and then is subjected to extrusion using a 45MN~63MN horizontal extruder, the extrusion ratio is 7~8, and an extruded pipe blank with a size (outer diameter×wall thickness) Φ152 ±2 mm×16 ±1 mm is prepared;

[0051] Step three, the extruded tube blank obtained in step two is shaped by using LG150 two-roller mill with a deformation of 32% to 34%, and then the inner and outer surfaces are treated, the inner hole of the shaped tube blank is bored 0.6mm to 0.7mm by using a boring machine or a lathe, and the outer surface of the shaped tube blank is turned or ground by using a centerless lathe, a grinder or a planer to remove defects, and then vacuum annealing is performed at a holding temperature of 720℃±15℃ to obtain a rolled tube blank;

[0052] Step four, the rolled tube blank obtained in step three is cold-rolled by using LG150 two-roller mill in one pass with a deformation of 40% to 43%, a rolling speed of 40 times / min to 50 times / min, and a rolling feed of 2mm / pass to 3mm / pass, vacuum annealing is performed at a holding temperature of 750℃±15℃ after cold rolling, the inner surface of the vacuum annealed rolled tube blank is sandblasted by using 50 mesh to 100 mesh sand particles at a gas pressure of 0.5MPa to 1.0MPa for not less than 2min at each end, the inner surface after sandblasting is uniform and consistent without visible horizontal and vertical micro-cracks and other defects, and the sandblasted inner surface is treated by pickling with a mixed acid solution of HF, HNO3 and water to remove inner wall defects to obtain a semi-finished tube blank;

[0053] Step five, the semi-finished tube blank obtained in step four is cold-rolled by using LG150 two-roller mill with a deformation of 38%, a rolling speed of 30 times / min to 40 times / min, and a rolling feed of 2mm / pass to 3mm / pass to obtain a finished size tube material with an outer diameter×wall thickness×length of Φ108mm×4.5mm×7000mm;

[0054] Step six, the finished size tube material obtained in step five is subjected to finished heat treatment, vacuum annealing is performed by using a vacuum furnace at a holding temperature of 680℃±10℃, and then warm straightening is performed by using a multi-roller straightening machine at a warm straightening temperature of 300℃ to 520℃, the straightening straightness after straightening meets the use requirements, and ultrasonic flaw detection is performed, the standard flaw meets a depth of 0.45mm, a width of 0.8mm, and a length of 25mm, the flaw detection qualified rate is more than 70%, and the length of a single tube material is greater than 6m to obtain TA24 titanium alloy cold-rolled tube material.

[0055] After detection, the performance of the TA24 titanium alloy cold-rolled tube material prepared in the embodiment is actually measured as follows: tensile strength Rm=790MPa to 820MPa, yield strength Rp 0.2 =640MPa to 660MPa, and elongation A=15% to 17%, which fully meets the performance requirements of the standard specification: tensile strength Rm≥730MPa, yield strength Rp 0.2 ≥580MPa, and elongation A≥13%.

[0056] The above merely illustrates the preferred embodiments of the present application, but does not limit the present application. Any simple modification, change and equivalent variation of the above embodiments according to the technical essence of the present application are still within the protection scope of the technical scheme of the present application.

Claims

1. A method of manufacturing a cold-rolled TA24 titanium alloy pipe for a ship, characterized by, The method comprises the following steps: Step one, selecting a TA24 titanium alloy ingot obtained by three vacuum arc furnace smelting as a raw material to prepare a rod blank by forging; the chemical composition of the rod blank meets the standard requirements of GB / T3620.1-2016 "Titanium and Titanium Alloy Grade and Chemical Composition", and the microstructure is equiaxed plus elongated processing structure without original beta grain boundary; Step two, drilling the rod blank prepared in step one, then sleeving, heating and keeping warm, and then using an extrusion machine to perform extrusion to obtain an extruded pipe blank; Step three, using a pipe rolling machine to perform shaping rolling on the extruded pipe blank obtained in step two, then performing inner and outer surface treatment to remove surface defects, and then performing heat treatment to obtain a rolled pipe blank; The deformation amount of the shaping rolling is not more than 35%, and the inner and outer surface treatment method is that a boring machine or a lathe is used to bore a hole of 0.4mm to 0.7mm on one side of the inner hole of the pipe blank after shaping rolling, and a centerless lathe, a grinding machine or a planer is used to turn or grind the outer surface of the pipe blank after shaping rolling to completely remove the defects; Step four, using an LG two-roller rolling mill or an LD multi-roller rolling mill to perform cold rolling on the rolled pipe blank obtained in step three, and performing intermediate pass heat treatment, and then performing inner surface sand blasting treatment and acid pickling treatment on the rolled pipe blank after heat treatment to remove inner wall defects to obtain a semi-finished pipe blank; The heat treatment in step three and step four is vacuum annealing, and the holding temperature of the vacuum annealing is 600-800 DEG C, wherein when the cumulative cold rolling deformation amount before vacuum annealing is greater than 30%, the holding temperature is 700-800 DEG C, and when the cumulative cold rolling deformation amount is not more than 30%, the holding temperature is 600-690 DEG C; The inner surface sand blasting treatment uses 50-100 mesh sand particles, the air pressure is 0.5-1.0 MPa, and the sand blasting time is not less than 2 minutes, and the inner surface is uniform, without visible horizontal and vertical microcracks and other defects; Step five, using an LG two-roller rolling mill or an LD multi-roller rolling mill to perform cold rolling on the semi-finished pipe blank obtained in step four to obtain a finished size pipe; Step six, performing finished product heat treatment on the finished size pipe obtained in step five, and then performing straightening and ultrasonic flaw detection to obtain a TA24 titanium alloy cold rolled pipe.

2. The method of claim 1, wherein the TA24 titanium alloy cold-rolled pipe for a naval vessel is manufactured by the steps of: The element composition and mass content of the rod blank in step one meet the standard requirements of GB / T3620.1-2016 "Titanium and Titanium Alloy Grade and Chemical Composition", and the oxygen mass content is controlled to be 0.07%-0.11%.

3. The manufacturing method of TA24 titanium alloy cold-rolled tube for shipbuilding according to claim 1, characterized in that, The sleeve in step two is a double sleeve with inner steel and outer copper, wherein the steel is soft steel with thickness of 0.5mm~0.8mm, and the copper is red copper with thickness of 0.7mm~1.2mm, the heating temperature is (T β -30)℃~(T β -80)℃, wherein T β is the phase transition point temperature, unit: ℃, the extruder is 20MN~45MN horizontal extruder, and the extrusion ratio is 5~15.

4. The method of claim 1, wherein the TA24 titanium alloy cold-rolled pipe for a naval vessel is manufactured by the steps of: The deformation amount of the cold rolling in step four is 25%-55%, the rolling speed is not more than 60 times / min, and the rolling feed amount is not more than 4mm / turn.

5. The method of claim 1, wherein the TA24 titanium alloy cold-rolled pipe for a naval vessel is manufactured by the steps of: The deformation amount of the cold rolling in step five is 30%-50%, the rolling speed is not more than 50 times / min, and the rolling feed amount is not more than 3mm / turn.

6. The method of claim 1, wherein the TA24 titanium alloy cold-rolled pipe for a naval vessel is manufactured by the steps of: The finished product heat treatment in step six is vacuum annealing, the holding temperature of the vacuum annealing is 650-780 DEG C, the straightening is performed using a multi-roller straightening machine with six or more rollers, and the straightening method is cold straightening or warm straightening, and the warm straightening temperature is 300-520 DEG C.