A method for preparing Ti-1300 titanium alloy thin-walled pipe

Abstract

The present invention discloses a method for preparing a Ti-1300 titanium alloy thin-walled pipe, which comprises: 1. mixing titanium sponge and an intermediate alloy, pressing them into an electrode block and welding them into electrodes for smelting to obtain a Ti-1300 titanium alloy ingot; 2. single-phase zone two-fire blanking forging; 3. multi-fire upsetting forging; 4. machining, annealing after passing the flaw detection; 5. spinning to obtain the Ti-1300 titanium alloy thin-walled pipe. The present invention ensures the uniformity of the Ti-1300 alloy bar blank structure by controlling the forging process, and ensures that the Ti-1300 titanium alloy tube blank is uniformly deformed during the spinning process by controlling the spinning process, avoiding the occurrence of undesirable phenomena such as expansion cracking, and while ensuring the strength and plasticity of the Ti-1300 titanium alloy thin-walled pipe, realizes the production of small batches of multi-specifications of Ti-1300 titanium alloy thin-walled pipes, which has broad application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of titanium alloy material processing, and particularly relates to a method for preparing a Ti-1300 titanium alloy thin-walled pipe. Background Art

[0002] Ti-1300 titanium alloy has the advantages of low density and higher specific strength than ordinary titanium alloys. Its biggest feature is its excellent strength and plasticity match. When the tensile strength is greater than 1300MPa, the elongation after fracture can reach 8%. The titanium alloy thin-walled pipes made from it can greatly improve the lightweight of aviation structural parts.

[0003] In terms of spin forming of high-strength titanium alloys, although a lot of research has been carried out on the thin-wall shell spin forming process, due to its high deformation resistance and poor plasticity at room temperature, cracking problems are prone to occur during the spinning process; and the flame heating method commonly used in the traditional spinning process has poor temperature uniformity and cannot adapt to the development of high-strength titanium alloy spin forming technology. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for preparing a Ti-1300 titanium alloy thin-walled tube in view of the deficiencies of the above-mentioned prior art. The method sequentially performs blanking forging, multi-fire forging, machining, material removal processing, annealing, and spinning processing on the Ti-1300 titanium alloy ingot, and ensures the uniformity of the Ti-1300 alloy bar blank structure by controlling the forging process, and ensures the uniform deformation of the Ti-1300 titanium alloy tube blank during the spinning process by combining the control of the spinning process, solves the problem of spinning cracking, and realizes the production of small batches of multi-specifications of Ti-1300 titanium alloy thin-walled tubes while ensuring the strength and plasticity of the Ti-1300 titanium alloy thin-walled tube.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for preparing a Ti-1300 titanium alloy thin-walled tube, characterized in that the method comprises the following steps:

[0006] Step 1: Mix the titanium sponge and the master alloy and press them into electrode blocks, then weld the electrode blocks into electrodes and place them in a vacuum consumable arc furnace for 3 smeltings to obtain a Ti-1300 titanium alloy ingot;

[0007] Step 2: subjecting the Ti-1300 titanium alloy ingot obtained in step 1 to single-phase zone two-fire forging to obtain a Ti-1300 titanium alloy forging blank;

[0008] Step 3, subjecting the Ti-1300 titanium alloy forging blank obtained in step 2 to multi-fire upsetting forging to obtain a Ti-1300 alloy bar blank;

[0009] Step 4: machining the Ti-1300 titanium alloy bar blank obtained in step 3, and annealing the bar blank after passing the flaw detection to obtain a Ti-1300 titanium alloy tube blank;

[0010] Step 5: Spin the Ti-1300 titanium alloy tube blank obtained in step 4 on a high-power spinning machine to obtain a Ti-1300 titanium alloy thin-walled tube; the outer diameter of the Ti-1300 titanium alloy thin-walled tube is 80 mm to 200 mm, the wall thickness is 1.5 mm to 3 mm, and the tensile strength of the Ti-1300 titanium alloy thin-walled tube after heat treatment is not less than 1300 MPa, and the elongation after fracture is not less than 8%.

[0011] The present invention forges a Ti-1300 titanium alloy ingot obtained by vacuum consumable smelting to obtain a forged blank, then performs multiple-fire upsetting forging to obtain a rod blank, and then processes the tube blank into a tube blank by machining, and then performs spinning and heat treatment on the tube blank to obtain a Ti-1300 titanium alloy thin-walled tube. In the preparation process, the uniformity of the Ti-1300 alloy rod blank structure is ensured by controlling the forging process and forging process parameters including forging temperature and deformation amount, and the uniform deformation of the Ti-1300 titanium alloy tube blank during the spinning process is ensured by combining the control of the spinning process and spinning parameters including spinning temperature, wall thickness deformation amount and feed amount, thereby avoiding the occurrence of undesirable phenomena such as expansion cracking, solving the problem of spinning cracking, ensuring the strength and plasticity of the Ti-1300 titanium alloy thin-walled tube and the matching of the two, and realizing the production of small batches of multi-specification Ti-1300 titanium alloy thin-walled tubes.

[0012] The above-mentioned method for preparing a Ti-1300 titanium alloy thin-walled pipe is characterized in that the temperature of the single-phase region two-fire forging in step 2 is not less than 1100°C, and the total deformation of each forging is not less than 80%. The present invention adopts a higher forging temperature to improve the fluidity of the Ti-1300 titanium alloy ingot deformation, and combines the use of a higher deformation amount to achieve the purpose of fully crushing the grains.

[0013] The above-mentioned method for preparing a Ti-1300 titanium alloy thin-walled pipe is characterized in that the process of multi-fire upsetting forging in step three is: first, single-phase zone cooling forging is performed, which is completed in four fires, and the forging temperature is 1050°C to 900°C, and the total deformation of each upsetting forging is not less than 130%; then two-phase zone forging is performed, which is completed in two fires, and the forging temperature is not lower than 800°C, the total deformation of the first upsetting forging is greater than 80%, and the total deformation of the second upsetting forging is greater than 30%. The present invention adopts a multi-fire upsetting forging process of first performing 6 fire forgings in a single-phase region and then performing 2 fire forgings in a two-phase region, so that a Ti-1300 titanium alloy forging blank is gradually deformed to obtain a Ti-1300 alloy rod blank. Combined with controlling the forging temperature and the total deformation amount of each fire, the uniformity of the Ti-1300 alloy rod blank structure is effectively guaranteed, which is beneficial to reducing the deformation resistance in the subsequent spinning process and avoiding the spinning cracking phenomenon.

[0014] The above-mentioned method for preparing a Ti-1300 titanium alloy thin-walled tube is characterized in that the Ti-1300 titanium alloy bar blank is machined by a blanking machine in step 4, the temperature of the annealing treatment is 770°C to 790°C, the holding time is 2 hours, and air cooling is performed. The present invention controls the temperature of the annealing treatment so that the Ti-1300 titanium alloy tube blank obtains a good strength level and the plasticity remains basically unchanged, which is conducive to the smooth progress of the subsequent spinning process.

[0015] The above-mentioned method for preparing a Ti-1300 titanium alloy thin-walled tube is characterized in that the temperature of the spinning process in step 5 is 400°C to 600°C, the wall thickness reduction rate is 10% to 35%, the feed rate is 100mm / min to 250mm / min, the temperature of the heat treatment is 500°C to 600°C, the holding time is 4h to 6h, and air cooling is performed. The present invention further promotes the full and uniform deformation of the Ti-1300 titanium alloy tube blank by strictly controlling the temperature, wall thickness reduction rate, and feed rate of the spinning process, and avoids defects such as spinning expansion cracking.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. The present invention sequentially performs blank forging, multi-fire forging, machining, blanking processing, annealing and spinning processing on the Ti-1300 titanium alloy ingot, and ensures the uniformity of the Ti-1300 alloy rod blank structure by controlling the forging process. Combined with the control of the spinning process, it ensures that the Ti-1300 titanium alloy tube blank is uniformly deformed during the spinning process, avoiding the occurrence of undesirable phenomena such as expansion cracking, and realizing the production of small batches of multi-specifications of Ti-1300 titanium alloy thin-walled tubes.

[0018] 2. In the forging process of the present invention, firstly, two-fire forging in the high-temperature single-phase zone is performed, combined with controlling the forging deformation, to quickly and fully break the coarse cast grains, thereby ensuring uniform deformation of the forging. Then, a large deformation forging method is adopted during the cooling forging in the single-phase zone for four fires, that is, the total deformation of each fire upsetting forging is not less than 130%, thereby achieving control of the uniformity of the rod structure required for the Ti-1300 titanium alloy tube blank, and free forging can be adopted in the forging process, the process flow is highly controllable, and the production of small batches of multi-specifications of Ti-1300 titanium alloy tubes is achieved.

[0019] 3. Compared with the traditional rolling tube process, the preparation method of the present invention has a short production process, and the bar material obtained while preparing the tube blank can be reused, which greatly improves the utilization rate of the material.

[0020] 4. The present invention adopts a multi-pass spinning process and selects M-state, i.e., annealed tube blanks for hot spinning. By controlling parameters such as spinning temperature, feed rate, and wall thickness thinning rate, the wall thickness uniformity and pass springback amount during the spinning process are well controlled, and the temperature supplementation process in the traditional hot spinning process is omitted, effectively reducing the uneven deformation and even cracking caused by uneven temperature supplementation of the spray gun.

[0021] 5. The Ti-1300 titanium alloy thin-walled tube prepared by the present invention has an outer diameter of 80 mm to 200 mm, a wall thickness of 1.5 mm to 3 mm, a tensile strength of not less than 1300 MPa, and an elongation after fracture of not less than 8%, and has broad application prospects.

[0022] The technical solution of the present invention is further described in detail below through embodiments. DETAILED DESCRIPTION

[0023] Example 1

[0024] This embodiment includes the following steps:

[0025] Step 1: Mix the titanium sponge and the master alloy and press them into electrode blocks, then weld the electrode blocks into electrodes and place them in a vacuum consumable arc furnace for 3 smeltings to obtain a Ti-1300 titanium alloy ingot with a diameter of Φ440 mm;

[0026] Step 2, placing the Ti-1300 titanium alloy ingot obtained in step 1 in an electric furnace for single-phase zone two-fire forging, both of which are three-upsetting and three-drawing forging, and the forging temperatures are 1150°C and 1100°C, respectively, the total deformation of the first fire forging is 145%, and the total deformation of the second fire forging is 138%, to obtain a Ti-1300 titanium alloy square billet with a side length of 350mm×350mm;

[0027] Step 3, placing the Ti-1300 titanium alloy billet obtained in step 2 in an electric furnace for multi-fire upsetting forging, first performing single-phase zone cooling forging, which is completed in four fires, and the four fires of single-phase zone cooling forging are all three upsetting and three drawing forging, and the forging temperatures are 1050°C, 1000°C, 900°C and 880°C, respectively, and the total deformation of each fire upsetting forging is 138%, and a Ti-1300 titanium alloy intermediate billet with a side length × side length of 300mm×300mm is obtained, and then two-phase zone forging is performed, which is completed in two fires, and the forging temperature is 800°C, wherein the first fire upsetting forging is two upsetting and two drawing forging, and the total deformation is 90%, and the second fire upsetting forging is bar billet drawing and rolling forging, and the total deformation is 40%, and a Ti-1300 alloy bar billet with a diameter of Φ170mm is obtained;

[0028] Step 4: The surface of the Ti-1300 titanium alloy bar blank obtained in step 3 is machined, and after passing the flaw detection, it is machined into an intermediate tube blank with an outer diameter × wall thickness × length of 160 mm × 8 mm × 500 mm by a blanking machine, and a rod with an outer diameter × length of 110 mm × 500 mm is obtained at the same time, and then the intermediate tube blank is kept at 770° C. for 2 h for annealing, air-cooled, and machined to obtain a Ti-1300 titanium alloy tube blank with an outer diameter × wall thickness × length of 156 mm × 6 mm × 500 mm;

[0029] Step 5. The Ti-1300 titanium alloy tube blank obtained in step 4 is spun on a high-power spinning machine. The spinning temperature is 400°C, the feed rate is 250mm / min, and the wall thickness reduction rate of the first spinning process is 10%, and the wall thickness reduction rate of each subsequent spinning process is 25%, to obtain a Ti-1300 titanium alloy thin-walled tube with an outer diameter × wall thickness × length of 150mm×3mm×1020mm, and an outer diameter tolerance of ±0.25mm, a wall thickness tolerance of ±0.2mm, and a straightness of no more than 1mm / 1020mm; after aging heat treatment at 500°C for 4h, the Ti-1300 titanium alloy thin-walled tube has a tensile strength of 1380MPa and an elongation at break of 9%.

[0030] Example 2

[0031] This embodiment includes the following steps:

[0032] Step 1: Mix the titanium sponge and the master alloy and press them into electrode blocks, then weld the electrode blocks into electrodes and place them in a vacuum consumable arc furnace for 3 smeltings to obtain a Ti-1300 titanium alloy ingot with a diameter of Φ440 mm;

[0033] Step 2, placing the Ti-1300 titanium alloy ingot obtained in step 1 in an electric furnace for single-phase zone two-fire forging, both of which are three-upsetting and three-drawing forging, and the forging temperatures are 1150°C and 1100°C, respectively, the total deformation of the first fire forging is 150%, and the total deformation of the second fire forging is 145%, to obtain a Ti-1300 titanium alloy square billet with a side length of 330 mm × a side length of 330 mm;

[0034] Step 3, placing the Ti-1300 titanium alloy billet obtained in step 2 in an electric furnace for multi-fire upsetting forging, first performing single-phase zone cooling forging, which is completed in four fires, and the four fires of single-phase zone cooling forging are all three upsetting and three drawing forging, and the forging temperatures are 1050°C, 980°C, 900°C and 850°C, respectively, and the total deformation of each fire upsetting forging is 145%, and a Ti-1300 titanium alloy intermediate billet with a side length × side length of 300mm×300mm is obtained, and then two-phase zone forging is performed, which is completed in two fires, and the forging temperature is 800°C, wherein the first fire upsetting forging is two upsetting and two drawing forging, and the total deformation is 100%, and the second fire upsetting forging is bar billet drawing and rolling forging, and the total deformation is 50%, and a Ti-1300 alloy bar billet with a diameter of Φ120mm is obtained;

[0035] Step 4: The surface of the Ti-1300 titanium alloy bar blank obtained in step 3 is machined, and after passing the flaw detection, it is machined into an intermediate tube blank with an outer diameter × wall thickness × length of 110 mm × 7 mm × 500 mm by a blanking machine, and a rod with an outer diameter × length of 660 mm × 500 mm is obtained at the same time, and then the intermediate tube blank is kept at 780° C. for 2 h for annealing, air-cooled, and machined to obtain a Ti-1300 titanium alloy tube blank with an outer diameter × wall thickness × length of 105 mm × 6 mm × 500 mm;

[0036] Step 5. The Ti-1300 titanium alloy tube blank obtained in step 4 is spun on a high-power spinning machine. The spinning temperature is 450°C, the feed rate is 180mm / min, and the wall thickness reduction rate of the first spinning process is 25%, and the wall thickness reduction rate of each subsequent spinning process is 30%, to obtain a Ti-1300 titanium alloy thin-walled tube with an outer diameter × wall thickness × length of 97.4mm×2.2mm×1194mm, and an outer diameter tolerance of ±0.25mm, a wall thickness tolerance of ±0.2mm, and a straightness of no more than 1mm / 1194mm; after aging heat treatment at 550°C for 6h, the Ti-1300 titanium alloy thin-walled tube has a tensile strength of 1345MPa and an elongation at break of 9.5%.

[0037] Example 3

[0038] This embodiment includes the following steps:

[0039] Step 1: Mix the titanium sponge and the master alloy and press them into electrode blocks, then weld the electrode blocks into electrodes and place them in a vacuum consumable arc furnace for 3 smeltings to obtain a Ti-1300 titanium alloy ingot with a diameter of Φ440 mm;

[0040] Step 2, placing the Ti-1300 titanium alloy ingot obtained in step 1 in an electric furnace for single-phase zone two-fire forging, both of which are three-upsetting and three-drawing forging, and the forging temperatures are 1150°C and 1100°C respectively, the total deformation of the first fire forging is 150%, and the total deformation of the second fire forging is 150%, to obtain a Ti-1300 titanium alloy square billet with a side length of 350mm×350mm;

[0041] Step 3, placing the Ti-1300 titanium alloy billet obtained in step 2 in an electric furnace for multi-fire upsetting forging, first performing single-phase zone cooling forging, which is completed in four fires, and the four fires of single-phase zone cooling forging are all three upsetting and three drawing forging, and the forging temperatures are 1050°C, 1000°C, 950°C and 900°C, respectively, and the total deformation of each fire upsetting forging is 140%, and a Ti-1300 titanium alloy intermediate billet with a side length × side length of 300mm×300mm is obtained, and then two-phase zone forging is performed, which is completed in two fires, and the forging temperature is 810°C, wherein the first fire upsetting forging is two upsetting and two drawing forging, and the total deformation is 90%, and the second fire upsetting forging is bar billet drawing and rolling forging, and the total deformation is 45%, and a Ti-1300 alloy bar billet with a diameter of Φ105mm is obtained;

[0042] Step 4: The surface of the Ti-1300 titanium alloy bar blank obtained in step 3 is machined, and after passing the flaw detection, it is machined into an intermediate tube blank with an outer diameter × wall thickness × length of 95 mm × 7 mm × 500 mm by a blanking machine, and a rod with an outer diameter × length of 50 mm × 500 mm is obtained at the same time, and then the intermediate tube blank is kept at 780° C. for 2 h for annealing, air-cooled, and machined to obtain a Ti-1300 titanium alloy tube blank with an outer diameter × wall thickness × length of 87 mm × 5 mm × 500 mm;

[0043] Step 5. The Ti-1300 titanium alloy tube blank obtained in step 4 is spun on a high-power spinning machine. The spinning temperature is 500°C, the feed rate is 200mm / min, and the wall thickness thinning rate of each spinning process is 35%, so as to obtain a Ti-1300 titanium alloy thin-walled tube with an outer diameter × wall thickness × length of 80mm×1.5mm×1740mm, and an outer diameter tolerance of ±0.25mm, a wall thickness tolerance of ±0.2mm, and a straightness of no more than 1mm / 1740mm; after aging heat treatment at 600°C for 5h, the Ti-1300 titanium alloy thin-walled tube has a tensile strength of 1325MPa and an elongation at break of 11.5%.

[0044] Example 4

[0045] This embodiment includes the following steps:

[0046] Step 1: Mix the titanium sponge and the master alloy and press them into electrode blocks, then weld the electrode blocks into electrodes and place them in a vacuum consumable arc furnace for 3 smeltings to obtain a Ti-1300 titanium alloy ingot with a diameter of Φ440 mm;

[0047] Step 2, placing the Ti-1300 titanium alloy ingot obtained in step 1 in an electric furnace for single-phase zone two-fire forging, both of which are three-upsetting and three-drawing forging, and the forging temperatures are 1150°C and 1100°C respectively, the total deformation of the first fire forging is 140%, and the total deformation of the second fire forging is 130%, to obtain a Ti-1300 titanium alloy square billet with a side length of 350mm×350mm;

[0048] Step 3, placing the Ti-1300 titanium alloy billet obtained in step 2 in an electric furnace for multi-fire upsetting forging, first performing single-phase zone cooling forging, which is completed in four fires, and the four fires of single-phase zone cooling forging are all three upsetting and three drawing forging, and the forging temperatures are 1050°C, 1000°C, 950°C and 900°C, respectively, and the total deformation of each fire upsetting forging is 140%, and a Ti-1300 titanium alloy intermediate billet with a side length × side length of 300mm×300mm is obtained, and then two-phase zone forging is performed, which is completed in two fires, and the forging temperature is 800°C, wherein the first fire upsetting forging is two upsetting and two drawing forging, and the total deformation is 100%, and the second fire upsetting forging is bar billet drawing and rolling forging, and the total deformation is 45%, and a Ti-1300 alloy bar billet with a diameter of Φ230mm is obtained;

[0049] Step 4: The surface of the Ti-1300 titanium alloy bar blank obtained in step 3 is machined, and after passing the flaw detection, it is machined into an intermediate tube blank with an outer diameter × wall thickness × length of 216 mm × 8 mm × 500 mm by a blanking machine, and a rod with an outer diameter × length of 170 mm × 500 mm is obtained at the same time, and then the intermediate tube blank is kept at 770° C. for 2 h for annealing, air-cooled, and machined to obtain a Ti-1300 titanium alloy tube blank with an outer diameter × wall thickness × length of 206 mm × 6 mm × 500 mm;

[0050] Step 5. The Ti-1300 titanium alloy tube blank obtained in step 4 is spun on a high-power spinning machine. The spinning temperature is 500°C, the feed rate is 150mm / min, and the wall thickness reduction rate of the first spinning process is 10%, and the wall thickness reduction rate of each subsequent spinning process is 25%, to obtain a Ti-1300 titanium alloy thin-walled tube with an outer diameter × wall thickness × length of 200mm×3mm×1015mm, and an outer diameter tolerance of ±0.25mm, a wall thickness tolerance of ±0.2mm, and a straightness of no more than 1mm / 1015mm; after aging heat treatment at 560°C for 6h, the Ti-1300 titanium alloy thin-walled tube has a tensile strength of 1340MPa and an elongation at break of 9.5%.

[0051] Example 5

[0052] This embodiment includes the following steps:

[0053] Step 1: Mix the titanium sponge and the master alloy and press them into electrode blocks, then weld the electrode blocks into electrodes and place them in a vacuum consumable arc furnace for 3 smeltings to obtain a Ti-1300 titanium alloy ingot with a diameter of Φ440 mm;

[0054] Step 2, placing the Ti-1300 titanium alloy ingot obtained in step 1 in an electric furnace for single-phase zone two-fire forging, both of which are three-upsetting and three-drawing forging, and the forging temperatures are 1150°C and 1100°C, respectively, the total deformation of the first fire forging is 150%, and the total deformation of the second fire forging is 145%, to obtain a Ti-1300 titanium alloy square billet with a side length of 350mm×350mm;

[0055] Step 3, placing the Ti-1300 titanium alloy billet obtained in step 2 in an electric furnace for multi-fire upsetting forging, first performing single-phase zone cooling forging, which is completed in four fires, and the four fires of single-phase zone cooling forging are all three upsetting and three drawing forging, and the forging temperatures are 1050°C, 1000°C, 980°C and 900°C, respectively, and the total deformation of each fire upsetting forging is 145%, and a Ti-1300 titanium alloy intermediate billet with a side length × side length of 300mm×300mm is obtained, and then two-phase zone forging is performed, which is completed in two fires, and the forging temperature is 810°C, wherein the first fire upsetting forging is two upsetting and two drawing forging, and the total deformation is 90%, and the second fire upsetting forging is bar billet drawing and rolling forging, and the total deformation is 40%, and a Ti-1300 alloy bar billet with a diameter of Φ160mm is obtained;

[0056] Step 4: The surface of the Ti-1300 titanium alloy bar blank obtained in step 3 is machined, and after passing the flaw detection, it is machined into an intermediate tube blank with an outer diameter × wall thickness × length of 140 mm × 7 mm × 500 mm by a blanking machine, and a rod with an outer diameter × length of 100 mm × 500 mm is obtained at the same time, and then the intermediate tube blank is kept at 790° C. for 2 h for annealing, air-cooled, and machined to obtain a Ti-1300 titanium alloy tube blank with an outer diameter × wall thickness × length of 134 mm × 6 mm × 500 mm;

[0057] Step 5. The Ti-1300 titanium alloy tube obtained in step 4 is spun on a high-power spinning machine. The spinning temperature is 600°C, the feed rate is 250mm / min, and the wall thickness reduction rate of the first spinning process is 10%, and the wall thickness reduction rate of each subsequent spinning process is 25%, to obtain a Ti-1300 titanium alloy thin-walled tube with an outer diameter × wall thickness × length of 128mm×3mm×1024mm, and an outer diameter tolerance of ±0.25mm, a wall thickness tolerance of ±0.2mm, and a straightness of no more than 1mm / 1024mm; after aging heat treatment at 560°C for 6h, the Ti-1300 titanium alloy thin-walled tube has a tensile strength of 1330MPa and an elongation at break of 9.5%.

[0058] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent change made to the above embodiment according to the technical essence of the invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for preparing a Ti-1300 titanium alloy thin-walled tube, characterized in that: The method comprises the following steps: Step 1: Mix the titanium sponge and the master alloy and press them into electrode blocks, then weld the electrode blocks into electrodes and place them in a vacuum consumable arc furnace for 3 smeltings to obtain a Ti-1300 titanium alloy ingot; Step 2: subjecting the Ti-1300 titanium alloy ingot obtained in step 1 to single-phase zone two-fire forging to obtain a Ti-1300 titanium alloy forging blank; Step 3, the Ti-1300 titanium alloy forging blank obtained in step 2 is subjected to multi-fire upsetting forging to obtain a Ti-1300 alloy bar blank; the process of the multi-fire upsetting forging is: firstly, single-phase zone cooling forging is completed in four fires, and the forging temperature is 1050°C to 900°C, and the total deformation of each upsetting forging is not less than 130%; then, two-phase zone forging is performed in two fires, and the forging temperature is not less than 800°C, the total deformation of the first upsetting forging is greater than 80%, and the total deformation of the second upsetting forging is greater than 30%; Step 4: machining the Ti-1300 titanium alloy bar blank obtained in step 3, and annealing the bar blank after passing the flaw detection to obtain a Ti-1300 titanium alloy tube blank; Step 5: Spin the Ti-1300 titanium alloy tube blank obtained in step 4 on a high-power spinning machine to obtain a Ti-1300 titanium alloy thin-walled tube; the outer diameter of the Ti-1300 titanium alloy thin-walled tube is 80 mm to 200 mm, the wall thickness is 1.5 mm to 3 mm, and the tensile strength of the Ti-1300 titanium alloy thin-walled tube after heat treatment is not less than 1300 MPa, and the elongation after fracture is not less than 8%.

2. The method for preparing a Ti-1300 titanium alloy thin-walled tube according to claim 1, characterized in that: The temperature of the two-fire forging in the single-phase region in step 2 is not less than 1100° C., and the total deformation of each forging is not less than 80%.

3. The method for preparing a Ti-1300 titanium alloy thin-walled tube according to claim 1, characterized in that: Step 4: The Ti-1300 titanium alloy bar blank is machined by a blanking machine, the annealing temperature is 770° C. to 790° C., the holding time is 2 hours, and air cooling is performed.

4. The method for preparing a Ti-1300 titanium alloy thin-walled tube according to claim 1, characterized in that: The temperature of the spinning process in step 5 is 400°C to 600°C, the wall thickness reduction rate is 10% to 35%, the feed rate is 100mm / min to 250mm / min, the temperature of the heat treatment is 500°C to 600°C, the holding time is 4h to 6h, and air cooling is performed.