An annealing apparatus for titanium alloy materials and a method for annealing them.

Abstract

This invention discloses an annealing apparatus for titanium alloy materials, comprising: a heating furnace, a stainless steel tube, a vacuum pumping device, and a protective gas delivery device. The stainless steel tube is placed inside the heating furnace, with a first port and a second port passing through a side wall of the furnace and extending outwards. The vacuum pumping device is connected to the first port of the stainless steel tube; the protective gas delivery device is connected to the second port of the stainless steel tube. The titanium alloy material is placed inside the stainless steel tube. This invention also discloses a method for annealing titanium alloy materials using the annealing apparatus described above. The annealing apparatus for titanium alloy materials of this invention provides atmosphere protection or vacuum protection, while simultaneously solving the problems of low efficiency, high cost, and large footprint associated with existing atmosphere-protected furnace and vacuum furnace annealing methods.

Description

Technical Field

[0001] This invention belongs to the field of metal material processing, and particularly relates to an annealing apparatus for titanium alloy materials and a method for annealing them. Background Technology

[0002] Titanium alloy wires, bars, and tubes are widely used in the processing of welding wires, fasteners, shafts, oil pipes, and other parts. During the manufacturing process of titanium alloy wires, bars, and tubes, due to work hardening, intermediate annealing heat treatment is required after a certain amount of deformation to restore plasticity. Furthermore, finished titanium alloy wires, bars, and tubes are typically delivered in the annealed state. Vacuum annealing is also used to remove hydrogen from titanium alloy materials.

[0003] Titanium alloy wires, bars, and tubes are prone to surface oxidation when heated in air. For example, after annealing in air at 800°C for 1 hour, the oxide layer thickness on the titanium alloy surface typically exceeds 0.1 mm. For small-diameter wires and bars, removing this oxide layer after annealing results in significant material loss, is time-consuming, and incurs high processing costs.

[0004] Annealing under a protective atmosphere or vacuum can avoid oxidation problems. Common methods include: long, thin titanium alloy wires, bars, and tubes are coiled into a circle and annealed in a pit furnace or box furnace under a protective atmosphere or vacuum; or annealing is performed without coiling in a continuous atmosphere-protected heating furnace with a long heating zone. The disadvantages of these conventional methods are: expensive equipment (atmosphere-protected furnaces and vacuum furnaces are typically tens of times more expensive than ordinary resistance heating furnaces); tubular or continuous heat treatment furnaces are usually tens of meters long, requiring large spaces; annealing in an atmosphere-protected furnace requires loading and cleaning before heating, and heating only after the protective gas has stabilized; the process is cumbersome and time-consuming, with cooling times typically lasting tens of hours, making it suitable for continuous, large-volume steel production but not for smaller batches of titanium alloy products; vacuum furnace annealing is expensive, energy-intensive, and time-consuming.

[0005] In summary, the metal processing industry urgently needs an annealing device that is low-cost, occupies a small area, and is highly efficient. Summary of the Invention

[0006] Based on this, in order to overcome the shortcomings of existing annealing devices for titanium alloy wires, bars and tubes, an annealing device for titanium alloy materials and a method for annealing them are provided. The device has atmosphere protection or vacuum protection effects, and solves the problems of low efficiency, high cost and large footprint of existing atmosphere protection furnace and vacuum furnace annealing methods.

[0007] To achieve the above objectives, the following technical solution is adopted:

[0008] This invention provides an annealing apparatus for titanium alloy materials, comprising:

[0009] Heating furnace;

[0010] A stainless steel tube is placed inside a heating furnace, with its first and second ports passing through a side wall of the furnace and extending out of the furnace.

[0011] A vacuum pumping device connected to the first port of a stainless steel tube;

[0012] A protective gas delivery device, which is connected to the second port of a stainless steel pipe;

[0013] The titanium alloy material is placed inside a stainless steel tube.

[0014] In some embodiments, titanium alloy materials include titanium alloy wires, titanium alloy bars, and titanium alloy tubes.

[0015] In some embodiments, the first and second ports of the stainless steel tube are welded to the vacuuming device and the protective gas delivery device via perforated plates.

[0016] In some embodiments, a valve for opening and closing is provided between the vacuuming device and the protective gas delivery device and the orifice plate.

[0017] In some embodiments, the first and second ports of the stainless steel tube pass through one side wall of the heating furnace to form the furnace door. The furnace door is provided with a furnace door hole, which is blocked by ceramic fiber bricks. The first and second ports pass through the ceramic fiber bricks and then extend out of the heating furnace.

[0018] In some embodiments, when the stainless steel pipe is made of multiple sections of stainless steel pipe connected together, after sealing the titanium alloy material into the stainless steel pipe, the multiple sections of stainless steel pipe are sealed and connected by argon arc welding.

[0019] The present invention also provides a method for annealing titanium alloy materials using the annealing apparatus described above, comprising the following steps:

[0020] Step 1) Clean the titanium alloy material and wrap it with annealed titanium foil;

[0021] Step 2) Place the coated titanium alloy material into a stainless steel tube;

[0022] Step 3) Weld both ends of the stainless steel pipe to the perforated plate;

[0023] Step 4) Place the stainless steel tube with the titanium alloy material into the heating furnace, so that both ends of the stainless steel tube extend out of the furnace door hole, and block the furnace door hole with ceramic fiber bricks.

[0024] Step 5) Use a vacuum pump to evacuate the stainless steel tube through the first port, and then use a protective gas delivery device to fill it with protective gas to a certain pressure through the second port.

[0025] Step 6) The furnace is used to heat the stainless steel tube and the titanium alloy material inside it to the annealing temperature in the air and hold it at that temperature.

[0026] Step 7) Remove the stainless steel tube from the heating furnace and let it cool; during the cooling process, continue to circulate protective gas.

[0027] Step 8) After complete cooling, remove the titanium alloy material from the stainless steel tube.

[0028] In some embodiments, titanium alloy materials include titanium alloy wires, titanium alloy bars, and titanium alloy tubes.

[0029] In some embodiments, titanium foil coating of titanium alloy material involves winding one or more layers of titanium foil around the outer surface of the titanium alloy material.

[0030] In some embodiments, in step (5), the vacuuming device uses a mechanical low vacuum pump to pump until the pressure vacuum gauge pointer points to the negative pressure limit position. Then, the valve on the side of the vacuuming device and the vacuuming device are closed. A protective gas delivery device is used to introduce protective gas into the stainless steel pipe to 0.1-0.16MPa. The valve on the side of the vacuuming device and the vacuuming device are opened, and the vacuum is pumped until the pressure vacuum gauge pointer points to the negative pressure limit position. Then, the valve on the side of the vacuuming device and the vacuuming device are closed, and protective gas is introduced until the pressure inside the pipe is 0.1-0.16MPa. The valve on the side of the vacuuming device is opened, and the gas flow rate is set to 1-5L / min to continuously introduce protective gas into the pipe.

[0031] The present invention has the following beneficial technical effects:

[0032] The annealing apparatus for titanium alloy materials of the present invention can use a conventional heating furnace, with vacuuming and protective gas filling only inside the stainless steel tube. This allows annealing to be performed under a protective atmosphere or vacuum without using a dedicated pit furnace or box furnace with a protective atmosphere or vacuum, significantly reducing equipment costs. The method of vacuuming and filling with protective gas inside the stainless steel tube means that vacuuming and gas filling only occur in a portion of the furnace body, greatly improving efficiency. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of an annealing apparatus for titanium alloy materials according to an embodiment of the present invention;

[0035] Figure 2 for Figure 1 A partial schematic diagram of the annealing apparatus.

[0036] List of reference numerals

[0037] 1-Resistance heating furnace; 2-Furnace door; 3-Stainless steel pipe; 4-Titanium alloy material; 5-Perforated plate; 6-Vacuum pressure gauge; 7-Flow meter; 8-Valve; 9-Ceramic fiber brick; 10-Sealing weld; 11-Ejection port; 12-Inlet port; 13-Furnace door hole. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings.

[0039] like Figure 1-2 A schematic diagram of an annealing apparatus for titanium alloy material 4 according to an embodiment of the present invention is shown. The annealing apparatus includes: a heating furnace, a stainless steel tube 3, a vacuum device, and a protective gas delivery device.

[0040] The titanium alloy material 4 includes titanium alloy wire, titanium alloy rod, and titanium alloy tube. The titanium alloy material 4 is placed inside the stainless steel tube 3.

[0041] The heating furnace is preferably a resistance heating furnace 1 commonly used in the art, which has a small footprint.

[0042] The stainless steel tube 3 is placed inside the heating furnace, with its first and second ports passing through one side wall of the heating furnace and extending out of the furnace.

[0043] The vacuum device is connected to the first port of the stainless steel tube 3; the vacuum port of the vacuum device is... Figure 1 The middle part is shown as air extraction port 11;

[0044] The protective gas delivery device is connected to the second port of the stainless steel pipe 3; the gas delivery port of the protective gas delivery device is... Figure 1 The middle part shows the air inlet 12;

[0045] The vacuum pumping device is a vacuum pump, such as a mechanical low vacuum pump; the protective gas delivered by the protective gas delivery device is an inert gas, preferably argon.

[0046] The first and second ports of the stainless steel pipe 3 are welded to the vacuum pumping device and the protective gas delivery device via an open plate 5, as shown below. Figure 1 The sealing weld 10 is shown.

[0047] A valve 8 for opening and closing is provided between the vacuuming device and the protective gas delivery device and the orifice plate 5.

[0048] A vacuum pressure gauge 6 and a flow meter 7 are installed between valve 8 and orifice plate 5. Vacuum pressure gauge 6 is used to detect the vacuum pressure inside stainless steel pipe 3, and flow meter 7 is used to indicate the gas flow rate supplied to stainless steel pipe 3.

[0049] The first and second ports of the stainless steel pipe 3 pass through one side wall of the heating furnace to form the furnace door 2. The furnace door 2 is provided with a furnace door hole 13. The ceramic fiber brick 9 blocks the furnace door hole 13. The first and second ports pass through the ceramic fiber brick 9 and extend out of the heating furnace (e.g., Figure 2 (As shown).

[0050] When the stainless steel pipe 3 is made of multiple sections of stainless steel pipe 3 connected together, the titanium alloy material 4 is sealed into the stainless steel pipe 3, and the multiple sections of stainless steel pipe 3 are sealed and connected by argon arc welding.

[0051] Preferably, when the titanium alloy material 4 is short and can be directly inserted into a single stainless steel tube 3, a single stainless steel tube 3 is used; otherwise, when the titanium alloy material 4 is long, multiple sections of stainless steel tube 3 are used. After the titanium alloy material 4 (including the titanium foil covering the material) is sealed into the stainless steel tube 3, the stainless steel tube 3 is sealed and connected by argon arc welding.

[0052] The method for annealing titanium alloy material 4 using the annealing apparatus described above according to an embodiment of the present invention includes the following steps:

[0053] Step 1) Clean the titanium alloy material 4 (including cleaning the grease, oxides, metal shavings, etc. on the inner and outer surfaces of the material), and prepare clean, bright, annealed titanium foil and stainless steel tube 3; use annealed titanium foil to cover the titanium alloy material 4.

[0054] Step 2) Place the coated titanium alloy material 4 into the stainless steel tube 3; wherein, for longer titanium alloy materials 4, use a tube bending machine to coil the stainless steel tube 3 into a disc that can be placed into the resistance heating furnace 1.

[0055] Step 3) Weld both ends of the stainless steel pipe 3 to the air extraction perforated plate 5.

[0056] Step 4) Place the stainless steel tube 3, along with the titanium alloy material 4, into the heating furnace, so that both ends of the stainless steel tube 3 extend beyond the furnace door opening 13. Block the furnace door opening 13 with ceramic fiber bricks 9;

[0057] Step 5) Use a vacuum pump to evacuate the stainless steel tube 3 through the first port, and then use a protective gas delivery device to fill it with protective gas to a certain pressure through the second port.

[0058] Step 6) Heat the stainless steel tube 3 and the titanium alloy material 4 inside it in the air to the annealing temperature and keep it at the required temperature according to the process.

[0059] Step 7) Remove the stainless steel tube 3 from the furnace and cool it at an appropriate temperature according to process requirements. If necessary, wrap it with insulation material to slow the cooling rate. Maintain argon gas protection throughout the cooling process.

[0060] Step 8) After complete cooling, remove the titanium alloy material 4 from the stainless steel tube 3. If the stainless steel tube 3 is coiled, straighten the coiled stainless steel tube 3 and the titanium alloy material 4 inside it;

[0061] Titanium foil-coated titanium alloy material 4 is made by wrapping one or more layers of titanium foil around the outer surface of titanium alloy material 4 without welding.

[0062] In step (5), a mechanical low vacuum pump is used to pump the vacuum device until the pressure gauge pointer points to the negative pressure limit position. Then, the valve 8 on the side of the vacuum device and the vacuum device are closed. Argon gas is introduced into the stainless steel tube 3 to 0.1-0.16MPa using a protective gas delivery device. The valve on the side of the vacuum device and the vacuum device are opened, and the vacuum is pumped until the pressure gauge pointer points to the negative pressure limit position. Then, the valve on the side of the vacuum device and the vacuum device are closed, and argon gas is introduced until the pressure inside the tube is 0.1-0.16MPa. The valve on the side of the vacuum device is opened, and the gas flow rate is set to 1-5L / min to continuously introduce argon gas into the tube.

[0063] The principle of this invention is as follows: titanium alloy wires, rods, and tubes are sealed inside a stainless steel tube 3. Through vacuuming, argon purging, and continuous argon gas flow into the stainless steel tube 3 during heating, the titanium alloy material is protected by argon gas during the heating process. Simultaneously, the titanium foil covering the titanium alloy material 4 oxidizes earlier and at a higher temperature during heating, thus consuming the oxygen in the tube atmosphere and protecting the material from surface oxidation.

[0064] Example 1

[0065] Vacuum annealing of TA18 titanium alloy tubes was performed using the apparatus and method of the present invention.

[0066] The TA18 titanium alloy tube has a diameter of 10mm, a wall thickness of 1.5mm, and a length of approximately 1m. Wipe the surface of the titanium tube clean of lubricating oil and metal shavings. Prepare a clean, bright, annealed SUS 304 stainless steel tube. The stainless steel tube has an outer diameter of 12mm, a wall thickness of 0.5mm, and a length of 3m. Clean, wipe, and dry both the titanium alloy tube and the stainless steel tube with anhydrous ethanol. Wrap the titanium alloy tube with 0.1mm TA1 titanium foil and place it in the middle of the stainless steel tube. Bend both ends of the stainless steel tube. Weld the two ends of the stainless steel tube to the perforated plate used for vacuuming and supplying protective gas using argon arc welding. Place the stainless steel tube into a resistance heating furnace (furnace chamber dimensions 1m × 1m × 1m), with both ends extending out of the furnace from the furnace door opening. Seal the furnace door opening with ceramic fiber bricks. Manually operate the mechanical low-vacuum pump and vacuum line valves to evacuate the stainless steel tube until the pressure gauge pointer points to the negative pressure limit (close to the ultimate vacuum level achievable by the mechanical vacuum pump, with the pressure inside the chamber below 10 Pa). Then, close the vacuum line valves and introduce argon gas until the pressure inside the chamber reaches 0.12 MPa. Evacuate again until the pressure gauge pointer points to the negative pressure limit, close the vacuum line valves and vacuum pump, and then introduce argon gas until the pressure inside the chamber reaches 0.12 MPa. Open the outlet and set the argon gas flow rate to 1 L / min. Maintain argon gas protection throughout the heat treatment process. Start heating in the resistance furnace. Annealing temperature is 750℃, holding time is 90 min. After holding, close the resistance furnace. After cooling to 400℃ in the furnace, open the furnace door and remove the stainless steel tube. Once the stainless steel tube has cooled to below 50℃, use an abrasive wheel cutter to cut it open from one end and remove the titanium tube. Observe the inner and outer surfaces of the titanium tube; there is no oxidation color. In subsequent rolling tests, the material was deformed to an outer diameter of 8 mm without cracking. This indicates that the annealing method achieved good results.

[0067] Example 2

[0068] Annealing of TB13 titanium alloy bars was performed using the apparatus and method of the present invention.

[0069] The TB13 titanium alloy rod has a diameter of 20mm and a length of approximately 3m, and is used as a wire blank for eyeglass frame manufacturing. Clean the surface of the titanium alloy rod of lubricating oil and metal shavings. Wrap the rod with 0.1mm TA1 titanium foil. Prepare a clean, bright, annealed SUS 304 stainless steel tube. The stainless steel tube has an outer diameter of 22mm, a wall thickness of 0.5mm, and a length of 4m. Clean, wipe, and dry the titanium alloy rod and stainless steel tube with anhydrous ethanol. Place the titanium alloy rod in the middle of the stainless steel tube and bend it to a diameter of 960mm using a tube bending machine. Bend both ends of the stainless steel tube. Weld the two ends of the stainless steel tube to the perforated plate used for vacuuming and supplying protective gas using argon arc welding. Place the stainless steel tube into a resistance heating furnace (furnace chamber size 1m×1m×1m), with both ends extending out of the furnace from the furnace door opening. Seal the furnace door opening with ceramic fiber bricks. Manually operate the mechanical low-vacuum pump and vacuum line valves to evacuate the stainless steel tube until the pressure gauge pointer points to the negative pressure limit (close to the ultimate vacuum level achievable by the mechanical vacuum pump, with the pressure inside the chamber below 10 Pa). Then, close the vacuum line valves and introduce argon gas until the pressure inside the chamber reaches 0.14 MPa. Evacuate again until the pressure gauge pointer points to the negative pressure limit, close the vacuum line valves and vacuum pump, and then introduce argon gas until the pressure inside the chamber reaches 0.14 MPa. Open the outlet and set the argon gas flow rate to 3 L / min. Maintain argon gas protection throughout the heat treatment process. Start heating in the resistance furnace. Annealing temperature is 820℃, holding time is 120 min. After holding, open the furnace door, remove the stainless steel tube, and cool it in air. Once the stainless steel tube has cooled to below 50℃, use an angle grinder to cut and separate it from the vacuum flange. Straighten the stainless steel tube and the titanium alloy rod within it. Use an angle grinder to remove the entire section of stainless steel tube, separating it from the titanium alloy rod. The titanium alloy bar showed no oxidation on its surface. During subsequent rotary forging, its diameter was reduced to 15mm, and no surface cracking or burrs were observed. This indicates that the annealing method achieved good results.

[0070] Example 3

[0071] Annealing of TB14 titanium alloy wire was performed using the apparatus and method of the present invention.

[0072] The TB14 material is a titanium wire blank for fasteners, with a diameter of 6.5mm and a length of approximately 10m. Clean the surface of the titanium alloy wire to remove lubricating oil and metal shavings. Wrap the titanium wire with 0.1mm TA1 titanium foil. Prepare four clean, bright, annealed SUS304 stainless steel tubes. The stainless steel tubes have an outer diameter of 8mm, a wall thickness of 0.5mm, and a length of 3m. Clean, wipe, and dry the titanium alloy wire and stainless steel tubes with anhydrous ethanol. Place the stainless steel tubes over the titanium alloy wire and connect and seal the four stainless steel tubes using argon arc welding. Bend the tubes to a diameter of 750mm with five turns using a pipe bending machine. Bend both ends of the stainless steel tubes. Weld the two ends of the stainless steel tubes to the perforated plates used for vacuuming and supplying protective gas using argon arc welding. Place the stainless steel tubes into a resistance heating furnace (furnace chamber dimensions 1m×1m×1m), with both ends extending out of the furnace from the furnace door opening. Seal the furnace door opening with ceramic fiber bricks. Manually operate the mechanical low-vacuum pump and vacuum line valves to evacuate the stainless steel tube until the pressure gauge pointer points to the negative pressure limit (close to the ultimate vacuum level achievable by the mechanical vacuum pump, with the pressure inside the chamber below 10 Pa). Then, close the vacuum line valves and introduce argon gas until the pressure inside the chamber reaches 0.13 MPa. Evacuate again until the pressure gauge pointer points to the negative pressure limit, close the vacuum line valves and vacuum pump, and then introduce argon gas until the pressure inside the chamber reaches 0.13 MPa. Open the outlet and set the argon gas flow rate to 2 L / min. Maintain argon gas protection throughout the heat treatment process. Start heating in the resistance furnace. Anneal at 800℃ for 60 minutes. After holding, open the furnace door, remove the stainless steel tube, and cool it in air. Once the stainless steel tube has cooled to below 50℃, use an angle grinder to cut and separate it from the vacuum flange. Straighten the stainless steel tube and the titanium alloy wire within it. Use an angle grinder to cut the stainless steel tube to separate it from the titanium alloy wire. The titanium alloy wire showed no oxidation on its surface. During subsequent roll drawing, its diameter was reduced to 4.37 mm, and no surface cracking or burrs were observed. This indicates that the annealing method achieved good results.

[0073] The above are exemplary embodiments disclosed in this invention. However, it should be noted that various changes and modifications can be made without departing from the scope of the embodiments of this invention as defined by the claims. Although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular number.

[0074] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of different aspects of the invention exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. An annealing apparatus for titanium alloy materials, characterized in that, include: Heating furnace; A stainless steel tube is placed inside the heating furnace, with a first port and a second port of the stainless steel tube passing through a side wall of the heating furnace and extending out of the heating furnace. A vacuum pumping device, the vacuum pumping device being connected to the first port of the stainless steel tube; A protective gas delivery device, wherein the protective gas delivery device is connected to the second port of the stainless steel pipe; The titanium alloy material is placed inside the stainless steel tube.

2. The annealing apparatus for titanium alloy materials as described in claim 1, characterized in that, Titanium alloy materials include titanium alloy wire, titanium alloy rod, and titanium alloy tube.

3. The annealing apparatus for titanium alloy materials as described in claim 2, characterized in that, The first and second ports of the stainless steel pipe are welded to the vacuuming device and the protective gas delivery device via perforated plates.

4. The annealing apparatus for titanium alloy materials as described in claim 3, characterized in that, The vacuum pumping device and the protective gas delivery device are equipped with valves for opening and closing, along with the perforated plate.

5. The annealing apparatus for titanium alloy materials as described in claim 1, characterized in that, The first and second ports of the stainless steel pipe pass through one side wall of the heating furnace to form the furnace door. The furnace door has a door hole, which is blocked by ceramic fiber bricks. The first and second ports pass through the ceramic fiber bricks and extend out of the heating furnace.

6. The annealing apparatus for titanium alloy materials as described in claim 1, characterized in that, When the stainless steel pipe is made of multiple sections of stainless steel pipe connected together, after sealing the titanium alloy material into the stainless steel pipe, the multiple sections of stainless steel pipe are sealed and connected by argon arc welding.

7. A method for annealing titanium alloy materials using the annealing apparatus as described in any one of claims 1-6, characterized in that, Includes the following steps: Step 1) Clean the titanium alloy material and wrap it with annealed titanium foil; Step 2) Place the coated titanium alloy material into a stainless steel tube; Step 3) Weld both ends of the stainless steel pipe to the perforated plate; Step 4) Place the stainless steel tube with the titanium alloy material into the heating furnace, so that both ends of the stainless steel tube extend out of the furnace door hole, and block the furnace door hole with ceramic fiber bricks. Step 5) Use a vacuum pump to evacuate the stainless steel tube through the first port, and then use a protective gas delivery device to fill it with protective gas to a certain pressure through the second port. Step 6) The furnace is used to heat the stainless steel tube and the titanium alloy material inside it to the annealing temperature in the air and hold it at that temperature. Step 7) Remove the stainless steel tube from the heating furnace and let it cool; during the cooling process, continue to circulate protective gas. Step 8) After complete cooling, remove the titanium alloy material from the stainless steel tube.

8. The method for annealing titanium alloy materials as described in claim 7, characterized in that, Titanium alloy materials include titanium alloy wire, titanium alloy rod, and titanium alloy tube.

9. The method for annealing titanium alloy materials as described in claim 7, characterized in that, Titanium foil-coated titanium alloy materials are made by wrapping one or more layers of titanium foil around the outer surface of the titanium alloy material.

10. The method for annealing titanium alloy materials as described in claim 7, characterized in that, In step (5), a mechanical low vacuum pump is used for vacuuming. The vacuum gauge pointer points to the negative pressure limit position. Then, the valve and vacuuming device on the vacuuming device side are closed. A protective gas delivery device is used to introduce protective gas into the stainless steel pipe to 0.1-0.16MPa. The valve and vacuuming device on the vacuuming device side are opened. The vacuum is evacuated until the vacuum gauge pointer points to the negative pressure limit position. Then, the valve and vacuuming device on the vacuuming device side are closed. Protective gas is introduced until the pressure inside the pipe is 0.1-0.16MPa. The valve on the vacuuming device side is opened, and the gas flow rate is set to 1-5L / min. Protective gas is continuously introduced into the pipe.

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