Preparation method for smelting high-rhenium molybdenum alloy pipe

Abstract

The invention discloses a preparation method for smelting a high-rhenium-molybdenum alloy pipe. The method comprises the following steps: 1, uniformly mixing Mo powder and Re powder, performing cold isostatic pressing, and sintering to obtain a high-rhenium-molybdenum alloy sintered blank; 2, carrying out vacuum electron beam smelting for many times to obtain a smelted high-rhenium molybdenum alloy cast ingot; 3, performing high-temperature extrusion combination and forging to obtain a smelted high-rhenium molybdenum alloy bar; 4, performing deep hole drilling, honing and machining treatment to obtain a smelted high-rhenium molybdenum alloy pipe blank; and 5, performing multi-pass high-temperature rolling, intermediate heat treatment, surface treatment and finished product heat treatment to obtain the smelted high-rhenium molybdenum alloy pipe. According to the method, repeated vacuum electron beam smelting is adopted, and repeated pressure machining such as high-temperature extrusion, forging and high-temperature rolling is combined, so that the purity and component uniformity of the smelted high-rhenium molybdenum alloy pipe are improved, the structure is uniform, the mechanical property is excellent, and higher dimensional precision and surface quality are obtained; the material is suitable for the fields of cladding pipes, heat pipes, medical implants and the like in nuclear reactors.

Description

Technical Field

[0001] The invention belongs to the technical field of preparing refractory metal alloy thin-walled pipes, and in particular relates to a method for preparing a smelting high-rhenium-molybdenum alloy pipe. Background Art

[0002] Molybdenum-rhenium alloys are widely used as structural and functional materials in the fields of nuclear industry, aerospace, electronics industry, medical implants, etc. due to their good machinability and excellent mechanical properties at room temperature and high temperature.

[0003] As a high melting point alloy, especially molybdenum-rhenium alloy with high rhenium content, it is usually prepared by powder metallurgy. However, powder metallurgy alloy has problems such as high impurity content and poor welding performance. As the nuclear industry, electronics, medical and other industries have high requirements for material purity, it is difficult for high-rhenium content molybdenum alloy prepared by powder metallurgy to meet the application requirements of the above fields. At the same time, in the above fields, this high-rhenium molybdenum alloy is mainly used in the form of pipes, such as fuel cladding tubes in nuclear reactors, heat pipes, cardiovascular stent substrates in the medical field, etc. This type of pipe requires extremely high dimensional accuracy and excellent mechanical properties, and generally requires multiple passes of precise high-temperature deformation (forging, rolling, etc.) to achieve.

[0004] It is difficult for the existing patented technologies to simultaneously meet the requirements of high purity, high dimensional accuracy and excellent mechanical properties in the preparation of high-rhenium molybdenum alloy pipes. For example, in patent CN111036893A, a powder metallurgy method is used to prepare a blank, and then a molybdenum-rhenium alloy pipe is obtained by forging and extrusion. This technical solution uses powder metallurgy to prepare the blank, which has problems such as low material purity and micro defects, and the dimensional accuracy of the pipe obtained by extrusion is also low; patent CN108213440A also uses powder metallurgy to prepare a blank, and then hot isostatic pressing is performed to obtain a molybdenum-rhenium alloy pipe. This technical solution also has the problem of low alloy purity, and no pressure processing is performed after hot isostatic pressing, and the mechanical properties of the material are insufficient; although patent CN111014654A uses rolling to perform multiple pressure processing on the molybdenum-rhenium alloy, the blank material is prepared by powder metallurgy, and there is also a problem of low material purity. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a preparation method for smelting high-rhenium molybdenum alloy pipes in view of the shortcomings of the above-mentioned prior art. The method adopts multiple vacuum electron beam smelting, combined with multiple pressure processing such as high-temperature extrusion and forging, high-temperature rolling, etc., to improve the purity and composition uniformity of the smelted high-rhenium molybdenum alloy pipes, and the structure is uniform, the mechanical properties are excellent, and higher dimensional accuracy and surface quality are obtained, which solves the problem that high-rhenium molybdenum alloy pipes in the prior art are difficult to have high purity, high dimensional accuracy and excellent mechanical properties.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a preparation method of smelting high-rhenium molybdenum alloy pipe, characterized in that the high-rhenium molybdenum alloy pipe includes the following components in mass percentage: Re 45.5% to 49.5%, and the rest is Mo, and the method comprises the following steps:

[0007] Step 1: According to the composition of the target product, the raw material Mo powder and Re powder are weighed, and then the Mo powder and Re powder are mixed evenly and loaded into a rubber sleeve, and then cold isostatic pressing is performed, and then sintered in a high-temperature hydrogen environment to obtain a high-rhenium molybdenum alloy sintered blank;

[0008] Step 2: subjecting the high-rhenium molybdenum alloy sintered blank obtained in step 1 to multiple vacuum electron beam melting to obtain a molten high-rhenium molybdenum alloy ingot;

[0009] Step 3: sawing and processing the molten high-rhenium molybdenum alloy ingot obtained in step 2, and then high-temperature extrusion combined with subsequent forging to obtain a molten high-rhenium molybdenum alloy rod;

[0010] Step 4: deep hole drilling, honing and machining the smelted high-rhenium molybdenum alloy rod obtained in step 3 to obtain a smelted high-rhenium molybdenum alloy tube blank;

[0011] Step 5: subjecting the smelted high-rhenium molybdenum alloy tube obtained in step 4 to multiple high-temperature rolling, intermediate heat treatment, surface treatment and finished product heat treatment in a tube warm rolling mill to obtain a smelted high-rhenium molybdenum alloy tube.

[0012] The above-mentioned method for preparing a smelting high-rhenium molybdenum alloy pipe is characterized in that the mass purity of the raw material Mo powder and Re powder in step one is greater than 99.5%.

[0013] The above-mentioned method for preparing a high-rhenium molybdenum alloy pipe by melting is characterized in that the number of vacuum electron beam melting in step 2 is 2 to 4 times, and the vacuum degree in the vacuum electron beam melting furnace is less than 1×10 -2 Pa, the melting speed is 15kg / h to 25kg / h. By controlling the melting speed, it is avoided that the melting speed is too slow and seriously affects the efficiency of the melting process, and the melting time is too long, which will cause a large amount of Mo volatilization, resulting in a large loss of ingot material and the main component Mo / Re ratio is difficult to control. At the same time, it is avoided that the melting speed is too fast, resulting in insufficient diffusion of Mo and Re and macroscopic component segregation of the ingot, and the melting speed is too fast, resulting in the inability to remove the gas in the molten pool in time, and the generation of micropores in the ingot during the cooling process, resulting in a large number of defects, making the smelted ingot unusable.

[0014] The above-mentioned method for preparing a smelting high-rhenium molybdenum alloy pipe is characterized in that the temperature of the high-temperature extrusion in step 3 is 1400°C to 1600°C. Usually, the extrusion temperature of molybdenum-rhenium alloy is 1000°C to 1350°C, which is only suitable for powder metallurgy molybdenum-rhenium billets with fine grains. The present invention increases the temperature of high-temperature extrusion for smelting high-rhenium molybdenum alloy ingots. On the one hand, a higher extrusion temperature is used to ensure that the alloy ingot has good deformation performance, so that a large deformation amount is used to fully break the grains in the alloy ingot with weak grain boundary bonding and coarse grains. On the other hand, a higher extrusion temperature is used to dynamically recrystallize and soften the alloy, eliminating the phenomenon of work hardening of the alloy ingot caused by high rhenium content.

[0015] The above-mentioned method for preparing a smelting high-rhenium molybdenum alloy pipe is characterized in that the temperature of the multiple high-temperature rolling in step 5 is 800°C to 1000°C. The smelting high-rhenium molybdenum alloy tube with a high rhenium content is obviously hardened during the deformation process, so by controlling the temperature of the multiple high-temperature rolling, it is avoided that the heating temperature is too low and the deformation resistance of the tube is large, which leads to rolling cracking. At the same time, it is avoided that the heating temperature is too high, the surface oxidation of the prepared tube is serious, and the dimensional accuracy is difficult to control, and the mandrel and the roller are deformed due to the decrease in strength at too high a temperature, which makes it difficult to continue the rolling process and causes the tube size to change.

[0016] The above-mentioned method for preparing a smelting high-rhenium molybdenum alloy tube is characterized in that the outer diameter of the smelting high-rhenium molybdenum alloy tube in step 5 is 15mm-30mm, the wall thickness is 0.3mm-0.6mm, and the surface finish is less than 0.8μm. The smelting high-rhenium molybdenum alloy tube prepared by the present invention has a large diameter and a thin tube wall, and is of high quality, and is suitable for medical use such as cardiovascular stents.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. The present invention prepares a high-rhenium molybdenum alloy sintered blank from raw material powder and then performs vacuum electron beam melting for multiple times, thereby improving the purity of the melted high-rhenium molybdenum alloy pipe, making its total impurity content ≤150wppm (testing more than 60 impurity elements), meeting the requirements for high purity of materials in the nuclear power and medical fields; at the same time, compared with a large number of precipitated phases existing in the high-rhenium molybdenum alloy prepared by powder metallurgy, the high-rhenium molybdenum alloy prepared by vacuum electron beam melting has a more uniform composition, no precipitated phase is generated, and has better processing performance and elasticity.

[0019] 2. The present invention adopts multiple pressure processing such as high-temperature extrusion, forging, high-temperature rolling, etc., so that the grain structure of the molybdenum-rhenium alloy is fully broken and deformed. Compared with single extrusion, forging or rolling deformation, the processing method of the present invention makes the smelting high-rhenium molybdenum alloy pipe undergo a larger deformation, a more uniform structure, and better mechanical properties; at the same time, the rolling method is used for the final deformation to obtain higher dimensional accuracy and surface quality.

[0020] 3. The room temperature tensile strength of the smelted high-rhenium-molybdenum alloy tube prepared by the present invention is above 1000MPa, and at the same time, it has an elongation after fracture of more than 20%, and has good strength and plasticity. The outer diameter is 15mm to 30mm, the wall thickness is 0.3mm to 0.6mm, and the surface finish is less than 0.8μm. It is suitable for cladding tubes, heat pipes and medical implants in nuclear reactors, and has high application value.

[0021] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the rolling direction metallographic structure diagram of the smelted high-rhenium molybdenum alloy tube prepared in Example 2 of the present invention.

[0023] Figure 2 This is a room temperature tensile fracture diagram of the smelted high-rhenium molybdenum alloy tube prepared in Example 4 of the present invention. DETAILED DESCRIPTION

[0024] Example 1

[0025] The high rhenium molybdenum alloy tube of this embodiment includes the following components in mass percentage: Re 45.5%, and the rest is Mo. The method includes the following steps:

[0026] Step 1: According to the composition of the target product smelting high-rhenium molybdenum alloy pipe, the raw material Mo powder and Re powder with a mass purity greater than 99.5% are weighed according to the mass percentage Mo:Re=60.5:39.5, and then the Mo powder and Re powder are mixed evenly in a V-type mixer and loaded into a rubber sleeve, and cold isostatic pressing is performed at a pressure of 200MPa and a time of 1min, and then sintered in a high-temperature hydrogen environment of 2200℃ for 6h to obtain a high-rhenium molybdenum alloy sintered blank;

[0027] Step 2: The high-rhenium molybdenum alloy sintered blank obtained in step 1 is subjected to vacuum electron beam melting twice, and the vacuum degree in the vacuum electron beam melting furnace is 5×10 -3 Pa, the melting speed is 20kg / h, and a molten high-rhenium molybdenum alloy ingot with a diameter of 90mm is obtained;

[0028] Step 3: sawing and processing the molten high-rhenium molybdenum alloy ingot obtained in step 2, and then extruding it at high temperature, the temperature of the high-temperature extrusion is 1400° C., and then forging it at 1400° C., the holding time of each forging is 30 minutes, and after polishing, a molten high-rhenium molybdenum alloy rod with a diameter of 29 mm is obtained;

[0029] Step 4: deep hole drilling, honing and machining the smelted high-rhenium molybdenum alloy rod obtained in step 3 to obtain a smelted high-rhenium molybdenum alloy tube blank with an outer diameter of 28 mm and a wall thickness of 3.5 mm;

[0030] Step 5: The smelted high-rhenium molybdenum alloy tube obtained in step 4 is subjected to 5 high-temperature rolling of a tube warm rolling mill, the high-temperature rolling temperature is 800°C, and each high-temperature rolling is softened by intermediate heat treatment, and alkali washing is performed after rolling, and then vacuum heat treatment is performed at 900°C for 1h to obtain a finished smelted high-rhenium molybdenum alloy tube.

[0031] After testing, the Re mass content of the product smelting high rhenium molybdenum alloy pipe prepared in this embodiment is 45.69%, the total impurity content is 133wppm, the outer diameter of the pipe is 18mm, the wall thickness is 0.4mm, the surface finish is 0.5μm, the room temperature tensile strength is 1055MPa, and the elongation after fracture is 25.5%.

[0032] Example 2

[0033] The high rhenium molybdenum alloy tube of this embodiment includes the following components in mass percentage: Re 47.5%, and the rest is Mo. The method includes the following steps:

[0034] Step 1: According to the composition of the target product smelting high-rhenium molybdenum alloy pipe, the raw material Mo powder and Re powder with a mass purity greater than 99.5% are weighed according to the mass percentage Mo:Re=56:44, and then the Mo powder and Re powder are mixed evenly in a V-type mixer and loaded into a rubber sleeve, and cold isostatic pressing is performed at a pressure of 200MPa and a time of 1min, and then sintered in a high-temperature hydrogen environment of 2200℃ for 6h to obtain a high-rhenium molybdenum alloy sintered blank;

[0035] Step 2: The high-rhenium molybdenum alloy sintered blank obtained in step 1 is subjected to vacuum electron beam melting twice, and the vacuum degree in the vacuum electron beam melting furnace is 5×10 -3 Pa, the melting speed is 18kg / h, and a molten high-rhenium molybdenum alloy ingot with a diameter of 90mm is obtained;

[0036] Step 3: sawing and processing the molten high-rhenium molybdenum alloy ingot obtained in step 2, and then extruding it at high temperature, the temperature of the high-temperature extrusion is 1500° C., and then forging it at 1400° C., the holding time of each forging is 30 minutes, and after polishing, a molten high-rhenium molybdenum alloy rod with a diameter of 31 mm is obtained;

[0037] Step 4: deep hole drilling, honing and machining the molten high-rhenium molybdenum alloy rod obtained in step 3 to obtain a molten high-rhenium molybdenum alloy tube blank with an outer diameter of 30 mm and a wall thickness of 4 mm;

[0038] Step 5: The smelted high-rhenium molybdenum alloy tube obtained in step 4 is subjected to 6 high-temperature rolling on a tube warm rolling mill, the high-temperature rolling temperature is 850°C, and each high-temperature rolling is softened by intermediate heat treatment, and alkali washing is performed after rolling, and then vacuum heat treatment is performed at 1000°C for 1h to obtain a finished smelted high-rhenium molybdenum alloy tube.

[0039] After testing, the Re mass content of the finished smelting high rhenium molybdenum alloy pipe prepared in this embodiment is 47.58%, the total impurity content is 106wppm, the outer diameter of the pipe is 21mm, the wall thickness is 0.44mm, the surface finish is 0.42μm, the room temperature tensile strength is 1106MPa, and the elongation after fracture is 33.5%.

[0040] Figure 1 This is the rolling microstructure diagram of the smelting high rhenium molybdenum alloy tube prepared in this embodiment. Figure 1 It can be seen that the grain structure of the pipe after rolling is fibrous along the rolling deformation direction, with uniform structure and no defects.

[0041] Example 3

[0042] The high rhenium molybdenum alloy tube of this embodiment includes the following components in mass percentage: Re 46.5%, and the rest is Mo. The method includes the following steps:

[0043] Step 1: According to the composition of the target product smelting high-rhenium molybdenum alloy pipe, the raw material Mo powder and Re powder with a mass purity greater than 99.5% are weighed according to the mass percentage Mo:Re=59:41, and then the Mo powder and Re powder are mixed evenly in a V-type mixer and loaded into a rubber sleeve, and cold isostatic pressing is performed at a pressure of 200MPa and a time of 1min, and then sintered in a high-temperature hydrogen environment of 2200℃ for 6h to obtain a high-rhenium molybdenum alloy sintered blank;

[0044] Step 2: The high-rhenium molybdenum alloy sintered blank obtained in step 1 is subjected to four vacuum electron beam melting processes. The vacuum degree in the vacuum electron beam melting furnace is 3×10 -3 Pa, the melting speed is 22.4 kg / h, and a molten high-rhenium molybdenum alloy ingot with a diameter of 90 mm is obtained;

[0045] Step 3: sawing and processing the molten high-rhenium molybdenum alloy ingot obtained in step 2, and then extruding it at high temperature, the temperature of the high-temperature extrusion is 1450° C., and then forging it at 1400° C., the holding time of each forging is 30 minutes, and after polishing, a molten high-rhenium molybdenum alloy rod with a diameter of 33 mm is obtained;

[0046] Step 4: deep hole drilling, honing and machining the smelted high-rhenium molybdenum alloy rod obtained in step 3 to obtain a smelted high-rhenium molybdenum alloy tube blank with an outer diameter of 32 mm and a wall thickness of 3.5 mm;

[0047] Step 5: The smelted high-rhenium molybdenum alloy tube obtained in step 4 is subjected to 8 high-temperature rolling on a tube warm rolling mill. The high-temperature rolling temperature is 900°C, and each high-temperature rolling is softened by intermediate heat treatment. After rolling, alkali washing is performed, and then vacuum heat treatment is performed at 900°C for 1 hour to obtain a finished smelted high-rhenium molybdenum alloy tube.

[0048] After testing, the finished product smelting high rhenium molybdenum alloy tube prepared in this embodiment has a Re mass content of 46.78%, a total impurity content of 122wppm, an outer diameter of the tube of 16mm, a wall thickness of 0.30mm, a surface finish of 0.66μm, a room temperature tensile strength of 1082MPa, and an elongation after fracture of 22.0%.

[0049] Example 4

[0050] The high rhenium molybdenum alloy tube of this embodiment includes the following components in mass percentage: Re 48.5%, and the rest is Mo. The method includes the following steps:

[0051] Step 1: According to the composition of the target product smelting high-rhenium molybdenum alloy pipe, the raw material Mo powder and Re powder with a mass purity greater than 99.5% are weighed according to the mass percentage Mo:Re=54.5:45.5, and then the Mo powder and Re powder are mixed evenly in a V-type mixer and loaded into a rubber sleeve, and cold isostatic pressing is performed at a pressure of 200MPa and a time of 1min, and then sintered in a high-temperature hydrogen environment of 2200℃ for 6h to obtain a high-rhenium molybdenum alloy sintered blank;

[0052] Step 2: The high-rhenium molybdenum alloy sintered blank obtained in step 1 is subjected to four vacuum electron beam melting processes. The vacuum degree in the vacuum electron beam melting furnace is 2×10 -3 Pa, the melting speed is 16.2 kg / h, and a melting high-rhenium molybdenum alloy ingot with a diameter of 110 mm is obtained;

[0053] Step 3: sawing and processing the molten high-rhenium molybdenum alloy ingot obtained in step 2, and then extruding it at high temperature, the temperature of the high-temperature extrusion is 1600° C., and then forging it at 1400° C., the holding time of each forging is 30 minutes, and after polishing, a molten high-rhenium molybdenum alloy rod with a diameter of 42 mm is obtained;

[0054] Step 4: deep hole drilling, honing and machining the smelted high-rhenium molybdenum alloy rod obtained in step 3 to obtain a smelted high-rhenium molybdenum alloy tube blank with an outer diameter of 40 mm and a wall thickness of 3.5 mm;

[0055] Step 5: The smelted high-rhenium molybdenum alloy tube obtained in step 4 is subjected to 8 high-temperature rolling on a tube warm rolling mill. The high-temperature rolling temperature is 1000°C, and each high-temperature rolling is softened by intermediate heat treatment. After rolling, alkali washing is performed, and then vacuum heat treatment is performed at 900°C for 1h to obtain a finished smelted high-rhenium molybdenum alloy tube.

[0056] After testing, the Re mass content of the finished smelting high rhenium molybdenum alloy pipe prepared in this embodiment is 48.36%, the total impurity content is 143wppm, the outer diameter of the pipe is 28mm, the wall thickness is 0.58mm, the surface finish is 0.60μm, the room temperature tensile strength is 1135MPa, and the elongation after fracture is 28.5%.

[0057] Figure 2 This is the room temperature tensile fracture diagram of the smelting high rhenium molybdenum alloy tube prepared in this embodiment. Figure 2 It can be seen that secondary cracks are generated on the tensile fracture of the tube, and the fibrous grains are tensilely fractured, showing typical plastic deformation characteristics.

[0058] Example 5

[0059] The high rhenium molybdenum alloy tube of this embodiment includes the following components in mass percentage: Re 49.5%, and the rest is Mo. The method includes the following steps:

[0060] Step 1: According to the composition of the target product smelting high-rhenium molybdenum alloy pipe, the raw material Mo powder and Re powder with a mass purity greater than 99.5% are weighed according to the mass percentage Mo:Re=53.5:46.5, and then the Mo powder and Re powder are mixed evenly in a V-type mixer and loaded into a rubber sleeve, and cold isostatic pressing is performed at a pressure of 200MPa and a time of 1min, and then sintered in a high-temperature hydrogen environment of 2200℃ for 6h to obtain a high-rhenium molybdenum alloy sintered blank;

[0061] Step 2: The high-rhenium molybdenum alloy sintered blank obtained in step 1 is subjected to vacuum electron beam melting twice, and the vacuum degree in the vacuum electron beam melting furnace is 3×10 -3Pa, the melting speed is 25kg / h, and a molten high-rhenium molybdenum alloy ingot with a diameter of 100mm is obtained;

[0062] Step 3: sawing and processing the molten high-rhenium molybdenum alloy ingot obtained in step 2, and then extruding it at high temperature, the temperature of the high-temperature extrusion is 1600° C., and then forging it at 1400° C., the holding time of each forging is 30 minutes, and after polishing, a molten high-rhenium molybdenum alloy rod with a diameter of 37 mm is obtained;

[0063] Step 4: deep hole drilling, honing and machining the smelted high-rhenium molybdenum alloy rod obtained in step 3 to obtain a smelted high-rhenium molybdenum alloy tube blank with an outer diameter of 35 mm and a wall thickness of 3.5 mm;

[0064] Step 5: The smelted high-rhenium molybdenum alloy tube obtained in step 4 is subjected to 6 high-temperature rolling on a tube warm rolling mill. The high-temperature rolling temperature is 1000°C, and each high-temperature rolling is softened by intermediate heat treatment. After rolling, alkali washing is performed, and then vacuum heat treatment is performed at 900°C for 1h to obtain a finished smelted high-rhenium molybdenum alloy tube.

[0065] After testing, the finished product smelting high rhenium molybdenum alloy pipe prepared in this embodiment has a Re mass content of 49.20%, a total impurity content of 127wppm, an outer diameter of the pipe of 24mm, a wall thickness of 0.5mm, a surface finish of 0.50μm, a room temperature tensile strength of 1171MPa, and an elongation after fracture of 30.5%.

[0066] 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 smelting high-rhenium molybdenum alloy pipe, characterized in that: The high-rhenium-molybdenum alloy tube comprises the following components in mass percentage: Re 45.5% to 49.5% and the remainder Mo. The method comprises the following steps: Step 1: According to the composition of the target product, the raw material Mo powder and Re powder are weighed, and then the Mo powder and Re powder are mixed evenly and loaded into a rubber sleeve, and then cold isostatic pressing is performed, and then sintered in a high-temperature hydrogen environment to obtain a high-rhenium molybdenum alloy sintered blank; Step 2: subjecting the high-rhenium molybdenum alloy sintered blank obtained in step 1 to multiple vacuum electron beam melting to obtain a molten high-rhenium molybdenum alloy ingot; Step 3: sawing and processing the molten high-rhenium molybdenum alloy ingot obtained in step 2, and then high-temperature extrusion combined with subsequent forging to obtain a molten high-rhenium molybdenum alloy rod; Step 4: deep hole drilling, honing and machining the smelted high-rhenium molybdenum alloy rod obtained in step 3 to obtain a smelted high-rhenium molybdenum alloy tube blank; Step 5: subjecting the smelted high-rhenium molybdenum alloy tube obtained in step 4 to multiple high-temperature rolling, intermediate heat treatment, surface treatment and finished product heat treatment in a tube warm rolling mill to obtain a smelted high-rhenium molybdenum alloy tube.

2. The method for preparing a smelting high-rhenium molybdenum alloy pipe according to claim 1, characterized in that: The mass purity of the raw material Mo powder and Re powder in step 1 is greater than 99.5%.

3. The method for preparing a smelting high-rhenium molybdenum alloy pipe according to claim 1, characterized in that: The number of vacuum electron beam melting in step 2 is 2 to 4 times, and the vacuum degree in the vacuum electron beam melting furnace is less than 1×10 - 2 Pa, the smelting speed is 15kg / h~25kg / h.

4. The method for preparing a smelting high-rhenium molybdenum alloy pipe according to claim 1, characterized in that: The temperature of the high temperature extrusion in step 3 is 1400°C to 1600°C.

5. The method for preparing a smelting high-rhenium molybdenum alloy tube according to claim 1, characterized in that: The temperature of the multiple high-temperature rolling in step 5 is 800°C to 1000°C.

6. The method for preparing a smelting high-rhenium molybdenum alloy tube according to claim 1, characterized in that: The outer diameter of the smelted high-rhenium molybdenum alloy tube in step 5 is 15 mm to 30 mm, the wall thickness is 0.3 mm to 0.6 mm, and the surface finish is less than 0.8 μm.

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