阅读说明：本技术 一种难熔和稀贵金属管材及其制备方法 (Refractory and rare noble metal pipe and preparation method thereof ) 是由 孙院军 孙博宇 孙紫昂 丁向东 孙军 曾毅 李金阳 柏小丹 宋坤朋 陈灿 于 2021-07-28 设计创作，主要内容包括：本发明公开了一种难熔和稀贵金属管材及其制备方法,包括：选择经过退火处理的毫米级厚度的稀贵金属板材；按照不同稀贵金属坯料和板材的尺寸选择不同的弯折方法,对对接面进行激光和/或电子束焊接,形成焊接型无缝管坯；经整形、焊缝打磨,热处理；然后对焊接型无缝管坯进行管材轧制；轧制管材进行酸碱洗。采用本发明方法制备的难熔和稀贵金属管材可以明显提高成品率,具有良好的抗拉强度和延伸率,成品率提高达30％以上,能够提高难熔稀贵金属原料利用率,本发明具有广阔的应用前景。(The invention discloses a refractory and rare noble metal pipe and a preparation method thereof, wherein the preparation method comprises the following steps: selecting a millimeter-grade rare noble metal plate subjected to annealing treatment; selecting different bending methods according to the sizes of different rare and precious metal blanks and plates, and carrying out laser and/or electron beam welding on the joint surfaces to form a welding type seamless tube blank; shaping, polishing welding seams and carrying out heat treatment; then, rolling the welding type seamless tube blank into a tube; and (4) carrying out acid and alkali washing on the rolled pipe. The refractory and rare and noble metal pipe prepared by the method can obviously improve the rate of finished products, has good tensile strength and elongation, improves the rate of finished products by more than 30 percent, can improve the utilization rate of refractory rare and noble metal raw materials, and has wide application prospect.)

1. A method for preparing refractory and rare noble metal pipes is characterized by comprising the following steps:

selecting a millimeter-grade rare noble metal plate subjected to annealing treatment;

selecting different bending methods according to the sizes of different rare and precious metal blanks and plates, and carrying out laser and/or electron beam welding on the joint surfaces to form a welding type seamless tube blank;

shaping a welded seamless tube blank, polishing a welding line, and carrying out heat treatment;

carrying out tube rolling on the welded seamless tube blank subjected to heat treatment;

and (4) carrying out acid-base washing on the rolled pipe subjected to heat treatment.

2. The method of claim 1, wherein the rare noble metal plate thickness H is selected to satisfy the following relationship with the finished tube inner diameter D and the finished tube thickness H: d is more than or equal to 50H and less than or equal to 15H, and H is less than or equal to 0.8H.

3. The method of claim 1, wherein the selective bending comprises:

for the plate with the length not more than 6m, the opposite sides of the rectangular plate are butted, and the butt joint line and the horizontal line form an angle of 30-60 degrees;

for the plate with the length of the pipe being more than or equal to 6m, a spiral bending method is selected, the opposite edges of the rectangular plate are in rotary butt joint along an axial spiral line, the length of the blank is increased through multiple spirals, and the number of spiral turns C and the width L of the plate meet the following requirements: l is less than or equal to 1.5C.

4. The method of claim 1, wherein the heat treatment temperature of the welded pipe blank is 750-1000 ℃ and the heat treatment time is 20-60 min.

5. The method for preparing the refractory and rare-noble metal pipe material according to claim 4, wherein the heat treatment temperature is 750-850 ℃ and the heat treatment time is 20-40min for the welded pipe blank to be the rare-noble metal molybdenum pipe.

6. The method for preparing the refractory and rare-noble metal pipe material according to claim 4, wherein the heat treatment temperature is 750-900 ℃ and the heat treatment time is 20-60min for the welded pipe blank of the rare-noble metal molybdenum-lanthanum alloy pipe.

7. The method for preparing the refractory and rare-noble metal pipe material according to claim 4, wherein the heat treatment temperature is 800-1000 ℃ and the heat treatment time is 20-60min for the welded pipe blank to be the rare-noble metal molybdenum-rhenium alloy pipe.

8. The method of claim 1, wherein the heat-treated welded seamless pipe blank is subjected to pipe rolling, and the heat treatment comprises repeating the rolling-heat treatment-rolling process for the welded seamless pipe blank to be rolled again.

9. The method of claim 1, wherein the initial rolling temperature is increased by 50-100 ℃, the rolling deformation is controlled at 10-35%, and the rolling speed is controlled at 0.10-0.35 m/min.

10. A refractory and rare earth metal pipe material produced by the method of any one of claims 1 to 9.

Technical Field

The invention belongs to the field of material processing, and relates to a refractory and rare noble metal pipe and a preparation method thereof.

Background

In recent years, the demand for refractory and rare metal pipes has increased, and the processing method thereof is mainly pipe rolling. The tube rolling method needs to take a tube blank with a specific size as a raw material and carry out axial rolling forming. For refractory metal materials, the refractory metal materials are generally prepared by a powder metallurgy method, because of poor properties, the material performance needs to be enhanced by pressure processing and large deformation strengthening, and finally a tube blank or a thick-wall tube is prepared by mechanical perforation; for rare and precious metal materials, rods can be prepared by a fusion casting method, and then pipe blanks or thick-wall pipes can be prepared by mechanical perforation. Because the waste of the punching material is huge and the processing cost is high, the preparation cost of the refractory and rare metal pipes is high, and the application of the punching material in the industry is seriously influenced.

At present, the production of rolled molybdenum tube blanks adopts powder metallurgy process and smelting process to directly produce tube blanks. The production of rolled molybdenum tube blanks by the powder metallurgy process has three routes: (1) high-purity molybdenum powder is pressed by CIP and directly sintered into a rolled tube blank at high temperature. (2) Pre-extruding the sintered molybdenum tube blank into a rolled tube blank. (3) Sintering into powder molybdenum ingot, extruding the molybdenum ingot into an extrusion rod blank, and machining the extrusion rod into a rolled molybdenum tube blank. Besides producing tube blanks by powder metallurgy process, the method can also be used for manufacturing rolled molybdenum tube blanks by smelting, which comprises the steps of casting molybdenum and molybdenum alloy cast ingots by electron beam smelting and vacuum consumable electrode arc smelting, performing secondary recasting, extruding the cast ingots into extrusion rods, and processing the extrusion rods into rolled molybdenum tube blanks. At the present stage, the molybdenum tube blank is manufactured by a third powder sintering method.

In order to reduce the preparation cost of the refractory and rare pipes, the refractory metal tungsten molybdenum can be used for preparing a pipe blank by a powder metallurgy method and then is rolled by a pipe rolling mill. However, the tube blank prepared by the powder metallurgy method has poor plasticity and high opening temperature, and the rolling temperature of the existing tube cannot be met. For large-size bars, holes can be punched in an electric spark mode, and then the bars are taken out from the center through a wire cutting method, so that the material loss is reduced. However, the maximum depth of electric spark perforation in China is less than 500mm at present, and the requirements of the feeding size of a tube blank and the length of a finished product cannot be met generally. And the wire cutting costs are also high.

The current molybdenum alloy pipe manufacturing process is as follows: (1) preparing molybdenum blanks from molybdenum powder by a powder metallurgy method; processing the molybdenum blank by at least one of a precision forging machine, an air hammer and a rotary hammer machine to forge a molybdenum rod; (2) turning the molybdenum rod obtained in the step (1) to manufacture a slender turning molybdenum rod; (3) and (2) completely clamping the polishing molybdenum rod obtained in the step (1) into a rigid clamp, and carrying out deep drilling at the rotating speed of 800 plus 1500rpm to obtain the molybdenum alloy thick-wall pipe. The thin-wall pipe is processed by multi-pass rolling with the blank as the raw material. The method is a basic method for preparing refractory and rare noble metal pipes. However, this method requires mechanical punching, which results in huge material waste, with a yield of only about 30%, and even more huge losses for valuable refractory metals and rare and precious metals. Secondly, the perforation cost is high, the unit price of the current mechanical perforation is about 2.0 yuan/mm, and the unit weight cost is increased and exceeds the material cost. Thirdly, the generated waste materials can not be recycled, and due to the lubrication requirement and the high temperature generated by drilling in the drilling process, the generated waste processing materials are difficult to recycle, so that the cost can not be reduced from the raw material processing angle.

The existing method for manufacturing the tube blank by the powder metallurgy method has low initial cost, but has high processing cost, the waste material of the tube blank processed by a deep hole drill is difficult to recycle and reutilize, and particularly when various long tubes and thick tubes are manufactured, the waste material occupies more than 70 percent of bars.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a refractory and rare-noble metal pipe and a preparation method thereof.

The invention is realized by the following technical scheme.

In one aspect of the invention, a method for preparing a refractory and rare noble metal pipe is provided, which comprises the following steps:

selecting a millimeter-grade rare noble metal plate subjected to annealing treatment;

selecting different bending methods according to the sizes of different rare and precious metal blanks and plates, and carrying out laser and/or electron beam welding on the joint surfaces to form a welding type seamless tube blank;

shaping a welded seamless tube blank, polishing a welding line, and carrying out heat treatment;

carrying out tube rolling on the welded seamless tube blank subjected to heat treatment;

and (4) carrying out acid-base washing on the rolled pipe subjected to heat treatment.

As a further preferable scheme, the thickness H of the rare and noble metal plate, the inner diameter D of the finished product pipe and the thickness H of the finished product pipe are selected to meet the following requirements: d is more than or equal to 50H and less than or equal to 15H, and H is less than or equal to 0.8H.

As a further preferable aspect, the selecting the bending method includes:

for sheets not longer than 6m, the rectangular sheets are butted at opposite edges at a butt line of 30-60 ° to the horizontal.

As a further preferable aspect, the selecting the bending method includes:

for the plate with the length of the ultra-long pipe being more than or equal to 6m, a spiral bending method is selected, the opposite edges of the rectangular plate are in rotary butt joint along the axial spiral line, the length of the blank is increased through multiple spirals, and the number of spiral turns C and the width L of the plate meet the following requirements: l is less than or equal to 1.5C.

As a further preferable scheme, the heat treatment temperature of the welded pipe blank is 750-1000 ℃, and the heat treatment time is 20-60 min.

As a further preferable scheme, the heat treatment temperature of the welded tube blank is 750-850 ℃ and the heat treatment time is 20-40 min.

As a further preferable scheme, the welding pipe blank is a rare and noble metal molybdenum lanthanum alloy pipe, the heat treatment temperature is 750-900 ℃, and the heat treatment time is 20-60 min.

As a further preferable scheme, the welding pipe blank is a rare and noble metal molybdenum-rhenium alloy pipe, the heat treatment temperature is 800-1000 ℃, and the heat treatment time is 20-60 min.

In a further preferred embodiment, the heat-treated welded seamless pipe blank is subjected to pipe rolling, and the heat treatment comprises repeating the rolling-heat treatment-rolling process for the welded seamless pipe blank which needs to be rolled again.

As a further preferable scheme, the primary rolling temperature is increased by 50-100 ℃, the rolling deformation is controlled at 10-35%, and the rolling speed is 0.10-0.35 m/min.

On the other hand, the invention also provides a refractory and rare noble metal pipe prepared by the method.

The invention has the following beneficial effects:

1) according to the invention, the seamed tube blank is prepared by bending the refractory and rare and noble metal plates, the millimeter-scale refractory and rare and noble metal plates are bent and formed, the tube is spirally coiled, and then the two ends of the plate are connected through welding, so that the molybdenum tube is formed twice, the forming rate is high, and the manpower, material resources and financial resources required by the traditional powder metallurgy secondary processing of the tube blank can be saved.

2) The welding type seamless pipe blank or the seamless pipe is made of the annealed plate, so that the condition that the plate is cracked or cracked and failed due to non-annealing during bending can be prevented.

3) By limiting the selected thickness of the plate, the inner diameter of the finished pipe and the thickness of the finished pipe, the problem that the plate is difficult to bend or cracks during bending due to over-thickness of the plate in the bending process and the problem that subsequent processing is easy to deform due to over-thinness of the plate are solved, and the yield is improved.

4) The method for checking the double-folding or spiral bending is selected in the processing process of the welded seamless tube blank or the seamless tube, and the method for checking the straight seam is not selected because the double-folding or spiral bending method can change the stress direction of a welding seam in rolling and subsequent machining, can improve the bearing strength of the welding seam and improve the anisotropy of the tube, can improve the overall strength of the welded seamless tube blank or the seamless tube, and can prevent the subsequent tube processing from losing efficacy.

5) This condition through restriction spiral number of turns C and panel width L has restricted the welding seam length of finished product tubular product pipe shaft, has effectively reduced the welding seam weak area, can prevent to appear very easily the phenomenon of fracture inefficacy because the welding seam accounts for than too big.

5) The heat treatment time after welding is reduced, the phenomenon that the performance of the welding line is poor due to the secondary growth of crystal grains caused by overlong heat preservation time of the welding line can be prevented, and the integral strength of the pipe can be improved.

6) By adopting laser/electron beam welding, the problems that the welding seam becomes a tube weak area due to overlarge performance difference between the welding seam and a base body generated by welding with a welding rod, and the welding seam cracks and other failures in subsequent use and even rolling processes can be solved, namely, the welding seam with the same strength as the base body can be obtained by laser/electron beam welding, and the problem of the welding seam due to unqualified performance is reduced.

7) The primary rolling temperature of the pipe needs to be increased by 50-100 ℃, and the rolling deformation and the rolling speed are reduced, because the bending forming and the welding are carried out in the early stage, certain work hardening and material internal local stress concentration can be generated on the welded seamless pipe blank or the seamless pipe after the processing, the performance of the welded seamless pipe blank or the seamless pipe is reduced, the whole welded seamless pipe blank or the seamless pipe is crisp and hard, the primary rolling temperature is increased, the primary rolling deformation and the rolling speed are reduced, the work hardening and internal stress local concentration generated in the early stage can be reduced, the failure phenomena of the welded seamless pipe blank or the seamless pipe such as cracking and the like in the rolling process are prevented, and the unnecessary loss is increased.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention:

FIG. 1 is a schematic view of a butt-welded structure of the alloy pipe of the present invention;

FIG. 2 is a schematic view of a spiral bending and welding structure of the alloy pipe of the present invention.

Detailed Description

The present invention will now be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions of the present invention are provided to explain the present invention without limiting the invention thereto.

The embodiment of the invention provides a preparation method of a refractory and rare noble metal pipe, which comprises the following steps:

1) selecting materials

Calculating and selecting the thickness of the plate according to the length of the finished pipe and the millimeter-scale thickness requirement, wherein the inner diameter D of the finished pipe, the selected thickness H of the plate and the thickness H of the finished pipe meet the following relationship: d is more than or equal to 50H and less than or equal to 15H, and H is less than or equal to 0.8H; and selecting the plate subjected to annealing treatment.

2) Bending and welding

Selecting different bending methods according to the calculated length of the blank and the length and width of the plate, machining, and dividing the bending methods into two types: for the plate with the length of the tube blank being not more than 5m, a folding method can be selected, wherein the folding angle is 30-60 degrees; for the plate with the length of the pipe being more than or equal to 5m, a spiral bending method needs to be selected, the length of the blank is increased through multiple spirals, but the number of spiral turns C and the width L (cm) of the plate meet the following relation: l is less than or equal to 1.5C.

A suitable seamed tube blank for welding is obtained as shown in figure 1. And (3) performing laser and/or electron beam oblique welding on the bent pipe blank or the spiral pipe blank to form a welding type seamless pipe blank or a seamless pipe.

3) Shaping and heat treatment

Thereafter, the welded seamless tube blank or the seamless tube is shaped, the weld joint is simply polished, and the welded tube blank is heat-treated. The heat treatment of the welded pipe blank is mainly to eliminate the stress concentration in the welded joint, and the temperature of the heat treatment is required to be at Ac of the prepared rare and noble refractory metal pipe₁Below, and when heat is preservedThe interval is not longer, for example, the molybdenum tube should be insulated for 20-40min at 750-850 ℃, the molybdenum-lanthanum alloy tube should be insulated for 20-60min at 750-900 ℃, and the molybdenum-rhenium alloy tube should be insulated for 20-60min at 800-1000 ℃.

4) Rolling and post-treatment

And (3) rolling the welded seamless tube blank or the seamless tube prepared in the step 3) at 1050 ℃ with the primary rolling temperature being increased by 50-100 ℃, the rolling deformation being controlled between 10-35% (the normal deformation is 20-30% per pass), and the rolling speed being reduced to 0.10-0.35m/min (the normal speed is about 0.5 m/min). And then according to the requirements of product specifications, if the thickness of the individual finished tube is slightly larger, the diameter-variable tube and the like need to be treated again, the process of rolling-heat treatment-rolling is repeated.

5) And (4) carrying out acid and alkali washing on the rolled and heat-treated pipe.

The tensile property and the yield of the processed pipe are detected, wherein the yield indexes comprise the pipe rolling success rate, the raw material utilization rate, the raw material waste rate and the like.

The invention is further illustrated by the following specific examples.

Example 1

And (3) selecting molybdenum-lanthanum alloy with the thickness of 2mm to bend and weld the pipe for forming.

Step 1, preparing a molybdenum-lanthanum tube with the tube length of 1.5m, the diameter of 6cm and the thickness of 2mm, selecting a molybdenum-lanthanum alloy plate with the thickness of 3.5mm, and selecting the plate in an annealed state;

step 2, selecting a molybdenum-lanthanum alloy plate with the length of 1m and the width of 18cm to butt joint two long edges at 30 degrees along the axial direction of the tube, and performing laser and electron beam welding on the butt joint surfaces to form a welding type seamless tube blank;

step 3, shaping the welding type seamless pipe blank or the seamless pipe, simply polishing the welding seam, and annealing the welding type seamless pipe blank by keeping the temperature at 800 ℃ for 40min to eliminate stress concentration in the welding seam;

step 4, rolling the welded seamless tube blank subjected to heat treatment at 950 ℃, wherein the primary rolling temperature is increased by 60 ℃ within a set temperature range, the rolling deformation is controlled to be 15%, the rolling speed is reduced to 0.30m/min, and the secondary rolling deformation and the secondary rolling speed are sequentially reduced; and conversely, the processing is carried out according to a seamless tube processing technology.

Step 5, performing heat treatment on the rolled tube blank (keeping the temperature at 900 ℃ for 60min), then performing secondary rolling according to the specification requirement of the product, and repeating the step 4-5;

and 6, carrying out acid and alkali cleaning on the rolled and heat-treated pipe.

The tensile strength and the elongation percentage of the processed tube are 964.39MPa and 27.34 percent which are measured by detecting the tensile property and the yield of the processed tube, the tensile strength and the elongation percentage are equivalent to those of the conventional process, the yield is 66 percent, the yield of the conventional molybdenum-lanthanum alloy tube is about 32 percent, the yield is improved by 34 percent on the same scale, and the recovery rate is 93 percent.

Example 2

And selecting molybdenum-lanthanum alloy with the thickness of 0.8mm to bend and weld the pipe for forming.

Step 1, preparing a molybdenum-lanthanum tube with the tube length of 1.2m, the diameter of 4cm and the thickness of 0.8mm, selecting a molybdenum-lanthanum alloy plate with the thickness of 1.5mm, and selecting the plate in an annealed state;

step 2, selecting a molybdenum-lanthanum alloy plate with the length of 1m and the width of 12cm to butt the two long edges at 45 degrees along the axial direction of the tube, and performing laser welding on the butt joint surfaces to form a welding type seamless tube blank;

step 3, shaping the welding type seamless pipe blank or the seamless pipe, simply polishing the welding seam, and annealing the welding type seamless pipe blank by keeping the temperature at 900 ℃ for 20min to eliminate stress concentration in the welding seam;

and 4, rolling the welded seamless pipe blank prepared in the step 3 at 950 ℃. The primary rolling temperature is increased by 50 ℃, the rolling deformation is controlled to be 10%, the rolling speed is reduced to 0.30m/min, and the secondary rolling deformation and the secondary rolling speed are sequentially reduced; and conversely, the processing is carried out according to a seamless tube processing technology.

Step 5, performing heat treatment on the rolled tube blank (keeping the temperature at 900 ℃ for 30min), then performing secondary rolling according to the specification requirement of the product, and repeating the step 4-5;

and 6, carrying out acid and alkali cleaning on the rolled and heat-treated pipe.

The tensile strength and the elongation percentage of the processed tube are respectively 673.89MPa and 29.75 percent which are measured by testing the tensile property and the yield of the processed tube, and are equivalent to those of the conventional process, the yield is 64 percent, the yield of the conventional molybdenum-lanthanum alloy tube is about 32 percent, the yield is improved by 32 percent on the same scale, and the recovery rate is 88 percent.

Example 3

Bending and welding the 0.8mm ultralong molybdenum alloy (>6m) pipe to form the pipe.

Step 1, preparing a molybdenum tube with the length of 5m, the diameter of 5cm and the thickness of 1mm, selecting a molybdenum alloy plate with the thickness of 2mm, and selecting an annealed plate;

step 2, selecting a molybdenum alloy plate with the length of 5m and the width of 12cm to spirally fold two long edges along the axial direction of the tube, and performing electron beam welding on the butt joint surfaces to form a welding type seamless tube blank;

step 3, shaping the welding type seamless pipe blank or the seamless pipe, simply polishing the welding seam, and annealing the welding type seamless pipe blank by keeping the temperature at 750 ℃ for 40min to eliminate stress concentration in the welding seam;

and 4, rolling the welded seamless pipe blank prepared in the step 3 at 950 ℃. The primary rolling temperature is increased by 100 ℃, the rolling deformation is controlled to be 12%, the rolling speed is reduced to 0.35m/min, and the secondary rolling deformation and the secondary rolling speed are sequentially reduced; and conversely, the processing is carried out according to a seamless tube processing technology.

Step 5, performing heat treatment on the rolled tube blank (keeping the temperature at 900 ℃ for 40min), then performing secondary rolling according to the specification requirement of the product, and repeating the step 4-5;

and 6, carrying out acid and alkali cleaning on the rolled and heat-treated pipe.

The tensile strength and the elongation percentage of the processed tube are measured to be 628.31MPa and 30.52 percent by testing the tensile property and the yield of the processed tube, the tensile strength and the elongation percentage are slightly higher than those of the conventional process, the yield is 61 percent, the yield of the conventional molybdenum-lanthanum alloy tube is about 32 percent, the yield is improved by 29 percent on the same scale, and the recovery rate is 90 percent.

Example 4

And bending and welding the molybdenum alloy pipe with the thickness of 0.8mm to form the pipe.

Step 1, preparing a molybdenum tube with the tube length of 1.2m, the diameter of 4cm and the thickness of 0.8mm, selecting a molybdenum alloy plate with the thickness of 1.5mm, and selecting the plate in an annealed state;

step 2, selecting a molybdenum alloy plate with the length of 1m and the width of 12cm to butt the two long edges at 45 degrees along the axial direction of the tube, and performing laser welding on the butt joint surfaces to form a welding type seamless tube blank;

step 3, shaping the welding type seamless pipe blank or the seamless pipe, simply polishing the welding seam, and annealing the welding type seamless pipe blank by keeping the temperature at 850 ℃ for 20min to eliminate stress concentration in the welding seam;

and 4, rolling the welded seamless pipe blank prepared in the step 3 at 950 ℃. The primary rolling temperature is increased by 70 ℃, the rolling deformation is controlled to be 15%, the rolling speed is reduced to 0.30m/min, and the secondary rolling deformation and the secondary rolling speed are sequentially reduced; and conversely, the processing is carried out according to a seamless tube processing technology.

Step 5, performing heat treatment on the rolled tube blank (keeping the temperature at 900 ℃ for 30min), then performing secondary rolling according to the specification requirement of the product, and repeating the step 4-5;

and 6, carrying out acid and alkali cleaning on the rolled and heat-treated pipe.

The tensile strength and the elongation percentage of the processed tube are 587.15MPa and 25.37 percent by testing the tensile property and the yield of the processed tube, the finished product ratio is 61 percent compared with the conventional process, the yield of the conventional molybdenum alloy tube is about 30 percent, the yield is improved by 31 percent in the same ratio, and the recovery rate is 89 percent.

Example 5

Selecting 1mm thick molybdenum-rhenium alloy to bend and weld the pipe for forming

Step 1, preparing a molybdenum-rhenium alloy tube with the tube length of 1.5m, the diameter of 6cm and the thickness of 2mm, and selecting a molybdenum-rhenium alloy plate with the thickness of 3.5mm, wherein the plate is in an annealed state;

step 2, selecting a molybdenum-rhenium alloy plate with the length of 1m and the width of 18cm to fold two long edges at 60 degrees along the axial direction of the tube, and performing laser and electron beam welding on the butt joint surfaces to form a welding type seamless tube blank;

step 3, shaping the welding type seamless pipe blank or the seamless pipe, simply polishing the welding seam, and annealing the welding type seamless pipe blank by keeping the temperature at 1000 ℃ for 20min to eliminate stress concentration in the welding seam;

step 4, rolling the welded seamless tube blank subjected to heat treatment at 1050 ℃, wherein the primary rolling temperature is increased by 90 ℃ within a set temperature range, the rolling deformation is controlled to be 13%, the rolling speed is reduced to 0.20m/min, and the secondary rolling deformation and the secondary rolling speed are sequentially reduced; and conversely, the processing is carried out according to a seamless tube processing technology.

Step 5, performing heat treatment on the rolled tube blank (keeping the temperature at 1100 ℃ for 60min), then performing secondary rolling according to the specification requirement of the product, and repeating the step 4-5;

and 6, carrying out acid and alkali cleaning on the rolled and heat-treated pipe.

The finished product rate of the processed tube is detected to be 65%, the finished product rate of the conventional molybdenum-rhenium alloy tube is about 33%, the yield is improved by 32% on the same scale, and the recovery rate is 92%.

Example 6

Selecting 1.5mm thick molybdenum-rhenium alloy to bend and weld the pipe material for forming

Step 1, preparing a molybdenum-rhenium alloy tube with the tube length of 1.8m, the diameter of 7cm and the thickness of 2mm, and selecting a molybdenum-rhenium alloy plate with the thickness of 3.5mm, wherein the plate is in an annealed state;

step 2, selecting a molybdenum-rhenium alloy plate with the length of 1m and the width of 18cm to fold two long edges at 35 degrees along the axial direction of the tube, and performing laser and electron beam welding on the joint surfaces to form a welding type seamless tube blank;

step 3, shaping the welding type seamless pipe blank or the seamless pipe, simply polishing the welding seam, and annealing the welding type seamless pipe blank by keeping the temperature at 800 ℃ for 60min to eliminate stress concentration in the welding seam;

step 4, rolling the welded seamless tube blank subjected to heat treatment at 1000 ℃, wherein the primary rolling temperature is increased by 90 ℃ within a set temperature range, the rolling deformation is controlled to be 35%, the rolling speed is reduced to 0.10m/min, and the secondary rolling deformation and the secondary rolling speed are sequentially reduced; and conversely, the processing is carried out according to a seamless tube processing technology.

Step 5, performing heat treatment on the rolled tube blank (keeping the temperature at 1100 ℃ for 60min), then performing secondary rolling according to the specification requirement of the product, and repeating the step 4-5;

and 6, carrying out acid and alkali cleaning on the rolled and heat-treated pipe.

The finished product rate of the processed tube is detected, the finished product rate is 68 percent, the finished product rate of the conventional molybdenum-rhenium alloy tube is about 33 percent, the yield is improved by 35 percent on the same scale, and the recovery rate is 95 percent.

The embodiment shows that the invention can obviously improve the yield of refractory rare and precious metal pipes without generating negative influence on the performance of the pipes, and the tensile strength is not lower than 587.15MPa, and the elongation is not lower than 25.37%; the percentage of improvement of the finished product rate reaches more than 30 percent, and the method has an important effect of improving the utilization rate of the refractory rare and precious metal raw materials, so the method has wide application prospect.

The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.