CN117225926B - A seamless narrow-diameter tube containing molybdenum, its preparation method and its application - Google Patents
A seamless narrow-diameter tube containing molybdenum, its preparation method and its applicationInfo
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Abstract
The invention provides a molybdenum-containing metal seamless small-diameter pipe, a preparation method and application thereof, wherein the method adopts a powder metallurgy method to prepare a rod blank, adopts a mechanical processing mode to process the rod blank into a pipe blank, and then adopts a hot drawing mode to prepare the molybdenum-containing metal seamless small-diameter pipe after spinning and necking the pipe blank, wherein the wall thickness of the molybdenum-containing metal seamless small-diameter pipe is 0.3mm ±0.05mm～0.8mm±0.1mm, the outer diameter of the molybdenum-containing metal seamless small-diameter pipe is 3.17mm ±0.05mm～6.35 mm±0.05mm, and the molybdenum-containing metal seamless small-diameter pipe can be used for preparing thermocouples. The preparation method overcomes the characteristics of poor room temperature plasticity, large brittleness and the like of molybdenum and molybdenum alloy, and realizes the preparation of the molybdenum-containing metal seamless small-diameter pipe.
Description
Technical Field
The invention belongs to the technical field of molybdenum metal products, relates to molybdenum and molybdenum alloy pipes, and in particular relates to a molybdenum-containing metal seamless small-diameter pipe, a preparation method and application thereof.
Background
Because of its excellent properties such as strengthening, light weight, high precision, etc., seamless thin-diameter pipes have been widely adopted in the technical fields of precision detection, transportation, etc., and more new materials, new processes and new structures have been continuously developed. The rare earth element (such as La 2O3) is added into the molybdenum powder to play a role in dispersion strengthening, the oxide dispersed phase reduces the recrystallization tendency of pure metal, the high temperature resistance of the material is improved, the grains form a dovetail-shaped lap joint structure after deformation processing and have good creep property, and the molybdenum alloy tube of the molybdenum meter can be widely applied to the field requiring high temperature resistant materials, such as a thermocouple cladding tube and the like.
At present, the preparation method of the molybdenum and molybdenum alloy mainly comprises extrusion, rolling, spinning and the like, and the molybdenum and molybdenum alloy has the characteristics of high melting point, high thermal strength, poor room temperature plasticity, large brittleness and the like, so that the defects of large crystal size, easy occurrence of inner and outer surface defects such as scales, microcracks and the like during spinning, low rolling efficiency, small feeding amount and the like are caused by high extrusion temperature (about 1400-1500 ℃) during preparation, so that the preparation difficulty of the seamless small-diameter tube of the molybdenum and molybdenum alloy is high, and the application of the seamless small-diameter tube is limited.
Disclosure of Invention
Aiming at the defects existing in the prior art, one of the purposes of the invention is to provide a molybdenum-containing metal seamless small-diameter pipe and a preparation method thereof, which solve the technical problem that the molybdenum and molybdenum alloy seamless small-diameter pipe is difficult to prepare because of poor room temperature plasticity and large brittleness of molybdenum in the prior art.
In order to overcome the defects in the prior art, the invention further aims to provide an application of the molybdenum-containing metal seamless small-diameter tube in preparing a thermocouple, and the technical problem that the application of the molybdenum-containing metal seamless small-diameter tube is limited due to the fact that the molybdenum-containing metal seamless small-diameter tube is difficult to prepare in the prior art is solved.
In order to solve the technical problems, the invention adopts the following technical scheme:
The preparation process of seamless small diameter molybdenum-containing pipe includes the following steps:
Step one, preparing a bar blank:
And pressing molybdenum powder or rare earth element molybdenum alloy powder to form, and sintering to obtain the rod blank.
Step two, preparing a tube blank:
Forging the rod blank obtained in the first step to be compact, performing rotary forging, head and tail sawing and annealing treatment to obtain a finished rod blank, punching the finished rod blank, performing annealing treatment, and hot rolling to obtain the tube blank.
Step three, spinning and necking the tube blank:
And (3) coaxially arranging an inner plug in the tube blank prepared in the second step, heating the tube blank with the inner plug to 500-600 ℃ for 1-3 min, carrying out first spinning, coaxially arranging an outer sleeve outside the tube blank, heating the tube blank with the inner plug and the outer sleeve to 500-600 ℃ for 1-3 min, carrying out second spinning, and finishing tube blank necking pretreatment and preparing the necked tube blank.
Step four, designing drawing pass:
And according to the drawing requirements, the drawing pass is designed, a drawing die is selected, and drawing technological parameters are determined.
Fifthly, online heating, drawing and straightening:
And (3) preheating the necking tube blank prepared in the step (III) to 120-200 ℃ for 20-30 seconds, continuously drawing for multiple times after preheating, replacing a new drawing die and a short core head after each drawing, straightening according to straightness requirements, and performing fixed-length shearing, alkali washing, finishing and treating the inner and outer surfaces after the final straightening is finished to obtain the molybdenum-containing metal seamless thin-diameter tube.
The straightening method comprises the specific processes of annealing the drawn pipe, preheating the annealed pipe to 180-220 ℃, preheating for 2-5 min, and after preheating, conveying the annealed pipe into a multi-roller straightener with an oil bath pipe, and straightening at the temperature of 180-220 ℃.
The invention also has the following technical characteristics:
Specifically, in the first step, the rare earth element is lanthanum, and the content of lanthanum in the rare earth element molybdenum alloy powder is 0.2-0.5 wt.%.
Specifically, in the second step, the outer diameter of the finished rod blank is 29-31 mm.
Specifically, in the third step, the outer diameter of the flower orifice of the inner plug is 5-8 mm, and the length of the inner plug is 30-45 mm.
Specifically, in the third step, the length of the outer sleeve is 50-60 mm.
Specifically, in the fifth step, the mixed atmosphere composed of hydrogen and compressed air is used for heating in the whole preheating and drawing process, wherein the flow rate of the hydrogen is 0.2-0.5 m 3/h, and the flow rate of the compressed air is 2-5 m 3/h.
Specifically, the oil bath pipe is arranged above the straightening rollers of the multi-roller straightener, the oil bath pipe is arranged along the transverse direction, the vertical distance between the oil bath pipe and the straightening rollers is 80mm, the length of the oil bath pipe is 100mm, a plurality of oil outlets are formed in the oil bath pipe along the transverse direction, the distance between the adjacent oil outlets is 10mm, and the inner diameter of each oil outlet is 0.2mm ±0.05mm.
Specifically, the oil bath pipe be linked together through defeated oil pipe and oil tank, defeated oil pipe sets up along vertical direction, the bottom mounting of defeated oil pipe is on the multi-roller straightener, the top of defeated oil pipe is linked together with defeated oil bath pipe.
The invention also provides a molybdenum-containing metal seamless small-diameter pipe, which is prepared by adopting the preparation method of the molybdenum-containing metal seamless small-diameter pipe, wherein the wall thickness of the molybdenum-containing metal seamless small-diameter pipe is 0.3mm ±0.05mm～0.8mm±0.1mm, and the outer diameter of the molybdenum-containing metal seamless small-diameter pipe is 3.17mm ±0.05mm～6.35 mm±0.05mm.
The invention also protects the application of the molybdenum-containing metal seamless small diameter pipe in preparing a thermocouple.
Compared with the prior art, the invention has the following technical effects:
(I) According to the preparation method of the molybdenum-containing metal seamless small-diameter pipe, the inner plug and the outer sleeve are adopted to protect the pipe blank in the spinning necking process, adverse effects caused by poor room temperature plasticity and large brittleness of molybdenum are avoided, further, the situation that the pipe blank breaks to cause preparation failure is avoided, in addition, the oil bath pipe is arranged above the multi-roller straightener, the temperature of the pipe straightening process can be controlled to be constant, and lubrication conditions are improved to further avoid brittle cracks. From the analysis, the preparation method of the invention overcomes the characteristics of poor room temperature plasticity, large brittleness and the like of molybdenum and molybdenum alloy, and realizes the preparation of the molybdenum-containing metal seamless small-diameter pipe.
The molybdenum-containing metal seamless small-diameter pipe has the average room temperature tensile strength of more than or equal to 722MPa, the yield strength of more than or equal to 615MPa and the elongation after fracture of more than or equal to 28.5 percent, and has good mechanical properties.
The thermocouple prepared by adopting the molybdenum-containing metal seamless small-diameter tube can bear a high-temperature environment, has the characteristics of high response speed, high precision, good stability and the like, and can meet the accurate measurement requirement in the high-temperature environment.
Drawings
Fig. 1 (a) is an overall schematic view of an assembled structure of a tube blank and an inner plug.
Fig. 1 (B) is a side view of an assembled structure of a tube blank and an inner plug.
Fig. 1 (C) is a front view of an assembled structure of a tube blank and an inner plug.
Fig. 2 (a) is an overall schematic diagram of the assembled structure of the tube blank and the jacket.
Fig. 2 (B) is a side view of the assembled structure of the tube blank and the jacket.
Fig. 2 (C) is a front view of the assembled structure of the tube blank and the jacket.
FIG. 3 (A) is a front view of a multi-roll leveler with an oil bath pipe.
FIG. 3 (B) is a top view of the multi-roll leveler with the oil bath pipe.
FIG. 3 (C) is a side view of a multi-roll leveler with an oil bath pipe.
FIG. 4 is a graph showing the mechanical properties of a seamless small diameter tube of the molybdenum lanthanum alloy numbered 1 in example 2.
FIG. 5 is a graph showing the mechanical properties of a seamless thin tube of molybdenum-lanthanum alloy numbered 2 in example 2.
FIG. 6 is a graph showing the mechanical properties of a seamless thin tube of molybdenum lanthanum alloy numbered 3 in example 2.
Fig. 7 is a graph of the macro morphology of the molybdenum lanthanum alloy seamless thin tube of example 2.
FIG. 8 is a graph of the macro morphology of the thermocouple produced in example 3.
The meanings of each reference mark and symbol in the figure are 1-pipe blank, 2-inner plug, 3-outer sleeve, 4-oil bath pipe, 5-multi-roll straightener, 6-straightening roll and 7-oil delivery pipe.
The following examples illustrate the invention in further detail.
Detailed Description
In the invention, the following components are added:
The superscript numbers with units denote tolerances, for example, "the wall thickness of the molybdenum-containing metal seamless small diameter tube is 0.5mm ±0.05mm", which means that the wall thickness of the molybdenum-containing metal seamless small diameter tube is 0.5mm, with a tolerance of 0.05mm.
All the apparatuses and molds of the present invention are, unless otherwise specified, apparatuses and molds known in the art, for example:
The multi-roll leveler employs a conventional multi-roll leveler known in the art.
The drawing die adopts conventional drawing dies known in the prior art, such as TG8 carbon tool steel, die casting die steel and 3W2Cr8V drawing dies.
The following specific embodiments of the present application are given according to the above technical solutions, and it should be noted that the present application is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solutions of the present application fall within the protection scope of the present application.
Example 1:
The embodiment provides a preparation method of a molybdenum-containing metal seamless small-diameter pipe, which comprises the steps of preparing a rod blank by a powder metallurgy method, processing the rod blank into a pipe blank by a mechanical processing mode, spinning and necking the pipe blank, and then preparing the molybdenum-containing metal seamless small-diameter pipe by a hot drawing mode.
Step one, preparing a bar blank:
And (3) adopting cold isostatic pressing (Cold isostatic pressing, CIP) technology to press and shape the molybdenum-lanthanum alloy powder, wherein the lanthanum content in the molybdenum-lanthanum alloy powder is 0.5: 0.5 wt percent, and sintering to obtain the molybdenum-lanthanum alloy rod blank, and the theoretical density of the molybdenum-lanthanum alloy rod blank is more than or equal to 97 percent.
Step two, preparing a tube blank:
Forging the molybdenum-lanthanum alloy rod blank obtained in the first step to be compact, performing rotary forging, head and tail sawing and annealing treatment to obtain a finished molybdenum-lanthanum alloy rod blank, wherein the outer diameter of the finished molybdenum-lanthanum alloy rod blank is 31mm, the straightness after rotary forging is 0.5mm/1000mm, punching the finished molybdenum-lanthanum alloy rod blank, performing annealing treatment, and hot rolling to obtain the molybdenum-lanthanum alloy tube blank.
Step three, spinning and necking the tube blank:
An inner plug 2 is coaxially arranged in a molybdenum-lanthanum alloy tube blank 1 manufactured in the second step, the outer diameter of a flower opening of the inner plug 2 is 8mm, an opening ensures that the inner plug is positioned and does not slide, the length of the inner plug 2 is 45mm, the molybdenum-lanthanum alloy tube blank 1 with the inner plug 2 is heated to 600 ℃, the heating time is 3min, the first spinning is carried out, then an outer sleeve 3 is coaxially arranged outside the molybdenum-lanthanum alloy tube blank 1, the length of the outer sleeve 3 is 60mm, the molybdenum-lanthanum alloy tube blank 1 with the inner plug 2 and the outer sleeve 3 is heated to 600 ℃, the heating time is 1min, the second spinning is carried out, and the necking pretreatment of the tube blank is completed, and the molybdenum-lanthanum alloy necking tube blank is manufactured.
In this embodiment, the inner plug 2 and the outer sleeve 3 are made of conventional pipes known in the prior art, preferably carbon steel pipes or stainless steel pipes, and the assembly relationship of the inner plug 2, the outer sleeve 3 and the molybdenum lanthanum alloy pipe blank 1 is shown in fig. 1 and 2. The flower mouth of the inner plug 2 is obtained by cutting, and the shape of the flower mouth is a cross horn shape. The inner plug 2 and the tube blank 1 are simultaneously plastically deformed when the tube blank is supported, the necking effect is not influenced by the reverse resistance to the plastic deformation of the tube blank 1, the outer sleeve 3 can ensure repeated clamping and use of necking heads in multiple passes, the inner plug 2 and the outer sleeve 3 deform together with spinning necking, the protection effect on the head end of the tube blank 1 can be effectively achieved, the influence on processing due to the room temperature brittleness of the molybdenum-lanthanum alloy tube blank is avoided, and the tube blank waste is reduced. The specific necking neck length can be adjusted according to the specifications of the drawing die and the clamping mouth, the outer diameter of the head end of the spinning necking pipe is measured, and if the outer diameter is not satisfied, the spinning necking can be performed again.
Step four, designing drawing pass:
The outer diameter of the molybdenum-lanthanum alloy necking pipe blank prepared in the third step is 10 ±0.05 mm, and the pipe wall thickness of the molybdenum-lanthanum alloy necking pipe blank is 1.0 ±0.05 mm. The design size of the molybdenum-lanthanum alloy seamless small-diameter pipe is that the outer diameter is 6.35 ±0.05 mm, and the wall thickness is 0.5 ±0.05 mm. The design outer diameter and the wall thickness of the molybdenum-lanthanum alloy seamless small-diameter pipe are different from those of the molybdenum-lanthanum alloy necking pipe blank, namely the drawing requirement is the reducing wall reduction, three-pass drawing is designed according to the drawing requirement, and a head-pass drawing die and a short core head, a two-pass drawing die and a short core head, and a three-pass drawing die and a short core head are selected.
Calculating the thermal expansion of the drawing die and the short core head by adopting a formula I, and adjusting the drawing procedure according to the thermal expansion result, wherein the formula I is as follows:
λ=α×l 0*（t-t0) of formula I.
Wherein:
λ represents the thermal expansion of the drawing die and the short core print.
Alpha represents the linear expansion coefficient of the drawing die and the short core print, and the unit is mm/mm.
L 0 denotes the dimensional length of the drawing die and the short core print, in mm.
T represents the heating temperature of the drawing die and the short core print, and the unit is DEG C.
T 0 represents the initial temperature of the drawing die and the short core head, the unit is the temperature, and t-t 0 is the temperature rise temperature difference.
In this embodiment, the linear expansion coefficients of the head-pass drawing die and the short core head, the two-pass drawing die and the short core head, and the three-pass drawing die and the short core head are respectively 14.7×10 -6（200℃）、15.6*10-6 (300 ℃) and 16.3×10 -6 (400 ℃), and the thermal expansion of the drawing die is 0.22-0.26 mm and the thermal expansion of the short core head is 0.02-0.025 mm under the temperature rise temperature difference of 200 ℃ after calculation. According to actual demands, the processing process route and the material of a die can be adjusted according to the calculation result, the wall thickness control pass is reasonably designed according to the theoretical deformation quantity and the influence of thermal expansion of the drawing die and the fixed short core head, and the accurate control of the wall thickness pass processing of the pipe can be realized.
Fifthly, online heating, drawing and straightening:
The method comprises the steps of preheating a molybdenum-lanthanum alloy necking tube blank prepared in the third step to 200 ℃ by adopting a heating furnace with a multi-layer chamber of hydrogen and combustion supporting gas, wherein the preheating time is 30 seconds, continuously drawing for three times after the preheating is finished, replacing a new drawing die and a short core head after each pass of drawing, straightening according to straightness requirements, heating the preheating and the drawing in a mixed atmosphere composed of hydrogen and compressed air, wherein the flow of the hydrogen is 0.5m 3/h, the flow of the compressed air is 5m 3/h, straightening is carried out after each pass of drawing, shearing is carried out by adopting a fixed-length online cutting machine after the last straightening is finished, and then, alkaline washing, finish machining and internal and external surface treatment are carried out to prepare the molybdenum-lanthanum alloy seamless small-diameter tube. The specific process of straightening comprises the steps of annealing the drawn pipe, preheating the annealed pipe to 200 ℃ by adopting an electric heating furnace for 3min, and conveying the annealed pipe into a multi-roller straightener 5 with an oil bath pipe 4 after preheating, and straightening at the temperature of 200 ℃. After each pass of drawing is finished, repeated straightening can be carried out twice, so that the straightness requirement is ensured.
In the embodiment, 4/6 holes are uniformly distributed in the circumferential direction during preheating, the effective heating length of the furnace body is 1000mm, so that uniform heating is ensured, the air pressure and the temperature of the die are regulated at any time during the drawing stage, and the experimental data are ensured to be real. In addition, as the temperature of the molybdenum-lanthanum alloy small-diameter pipe is reduced rapidly at room temperature, the outlet of the electric heating furnace is required to be close to the feed inlet of the multi-roller straightener in order to avoid brittle fracture of the pipe caused by temperature reduction.
As a specific scheme of the embodiment, the oil bath pipe 4 is manufactured after galvanized pipes are punched, as shown in fig. 3, the oil bath pipe 4 is positioned above the straightening rollers 6 of the multi-roller straightener 5, the vertical distance between the oil bath pipe 4 and the straightening rollers 6 is 80mm, the length of the oil bath pipe 4 is 100mm, a plurality of oil outlets are formed in the oil bath pipe 4 along the transverse direction, the distance between the adjacent oil outlets is 10mm, and the inner diameter of each oil outlet is 0.2mm plus or minus 0.05mm. The oil bath pipe 4 is communicated with an oil tank through an oil conveying pipe 7, the oil conveying pipe 7 is arranged along the vertical direction, the bottom end of the oil conveying pipe 7 is fixed on the multi-roller straightening machine 5, and the top end of the oil conveying pipe 7 is communicated with the oil bath pipe 4.
In the embodiment, the straightening pipe can be covered by the oil sprayed out of the oil outlet through the path, so that the aim of high-temperature oil bath is fulfilled. Compared with the cold straightening of a non-modified multi-roller straightener, the oil bath straightening is characterized in that the modification of straightening rollers and the design of oil bath nozzles are adopted, and the straightening rollers are made of hot grinding tool steel so as to meet the constant temperature of the oil bath of the pipe in the straightening process. The oil product contained in the oil tank selects high-temperature heat conduction oil with low viscosity and high flash point, and is preferably L-QB300-II GB23971 great wall heat conduction oil, and the oil bath can ensure that the temperature is kept constant in the straightening process, and in addition, the oil product can lubricate and seal the friction part of the machine, so that brittle cracks are avoided.
Example 2:
The embodiment provides a molybdenum-containing metal seamless small-diameter pipe, which is prepared by adopting the preparation method of the molybdenum-containing metal seamless small-diameter pipe, wherein the wall thickness of the molybdenum-containing metal seamless small-diameter pipe is 0.5mm ±0.05mm, the outer diameter is 6.35mm ±0.05mm, the straightness is less than or equal to 0.5mm/1000mm, the roughness of the outer surface is less than 0.5 microns, and the roughness of the inner surface is less than 0.8 microns. From the above results, it is clear that the actual dimensions of the molybdenum-lanthanum alloy seamless small diameter pipe conform to the design dimensions, and the appearance is shown in fig. 7.
In this example, the mechanical properties of the molybdenum-lanthanum alloy seamless thin tube are shown in table 1, fig. 4, fig. 5 and fig. 6, and #1, # 2 and # 3 in table 1 are numbers of three parallel tests, respectively.
Table 1, mechanical properties room temperature data table of molybdenum lanthanum alloy seamless thin diameter tube
Example 3:
This example shows the use of the molybdenum-containing metal seamless slim tube of example 2 for preparing a thermocouple, the final thermocouple prepared being shown in fig. 8. The thermocouple can bear a high-temperature environment, has the characteristics of high response speed, high precision, good stability and the like, and can meet the accurate measurement requirement under the high-temperature environment.
Claims (10)
1. The preparation method of the molybdenum-containing metal seamless small-diameter pipe is characterized by comprising the following steps of:
Step one, preparing a bar blank:
pressing molybdenum powder or rare earth element molybdenum alloy powder to form, and sintering to obtain a bar blank;
Step two, preparing a tube blank:
Forging the rod blank obtained in the first step to be compact, performing rotary forging, head and tail sawing and annealing treatment to obtain a finished rod blank, punching the finished rod blank, performing annealing treatment, and performing hot rolling to obtain a tube blank;
Step three, spinning and necking the tube blank:
Coaxially arranging an inner plug (2) in the tube blank (1) prepared in the second step, heating the tube blank (1) with the inner plug (2) to 500-600 ℃ for 1-3 min, and carrying out first spinning; then, coaxially arranging an outer sleeve (3) outside the tube blank (1), heating the tube blank (1) with the inner plug (2) and the outer sleeve (3) to 500-600 ℃ for 1-3 min, and carrying out second spinning to finish tube blank necking pretreatment and prepare a necked tube blank;
step four, designing drawing pass:
determining drawing requirements according to the design dimensions of the hot rolled tube blank and the molybdenum-containing metal seamless small-diameter tube, designing drawing passes according to the drawing requirements, selecting a drawing die and determining drawing technological parameters;
Fifthly, online heating, drawing and straightening:
Preheating the necking pipe blank prepared in the third step to 120-200 ℃ for 20-30 seconds, continuously drawing for multiple times after the preheating is finished, replacing a new drawing die and a short core head after each pass of drawing, straightening according to straightness requirements, and performing fixed-length shearing, alkali washing, finish machining and inner and outer surface treatment after the final straightening is finished to prepare a molybdenum-containing metal seamless thin-diameter pipe;
The straightening method comprises the specific processes of annealing the drawn pipe, preheating the annealed pipe to 180-220 ℃, preheating for 2-5 min, and after preheating, conveying the annealed pipe into a multi-roller straightener (5) with an oil bath pipe (4), and straightening at 180-220 ℃.
2. The method for producing a molybdenum-containing seamless small-diameter pipe according to claim 1, wherein in the first step, the rare earth element is lanthanum, and the content of lanthanum in the rare earth element molybdenum alloy powder is 0.2 to 0.5 wt.%.
3. The method for producing a seamless small diameter tube of molybdenum-containing metal according to claim 1, wherein in the second step, the outer diameter of the finished rod blank is 29 to 31mm.
4. The method for producing a molybdenum-containing metal seamless small diameter pipe according to claim 1, wherein in the third step, the outer diameter of the mouth of the inner plug is 5-8 mm, and the length of the inner plug is 30-45 mm.
5. The method for producing a seamless small diameter tube of molybdenum-containing metal as defined in claim 1, wherein in the third step, the length of the jacket is 50-60 mm.
6. The method for producing a molybdenum-containing metal seamless small diameter pipe according to claim 1, wherein in the fifth step, the whole process of preheating and drawing is heated by using a mixed atmosphere composed of hydrogen and compressed air, wherein the flow rate of the hydrogen is 0.2-0.5 m 3/h, and the flow rate of the compressed air is 2-5 m 3/h.
7. The method for preparing the molybdenum-containing metal seamless small-diameter pipe according to claim 1, wherein the oil bath pipe (4) is positioned above the straightening roller (6) of the multi-roller straightener (5), the oil bath pipe (4) is arranged along the transverse direction, the vertical distance between the oil bath pipe (4) and the straightening roller (6) is 80mm, the length of the oil bath pipe (4) is 100mm, a plurality of oil outlets are formed in the oil bath pipe (4) along the transverse direction, the distance between the adjacent oil outlets is 10mm, and the inner diameter of the oil outlets is 0.2mm ±0.05mm.
8. The method for preparing the molybdenum-containing metal seamless small-diameter pipe according to claim 7, wherein the oil bath pipe (4) is communicated with an oil tank through an oil conveying pipe (7), the oil conveying pipe (7) is arranged along the vertical direction, the bottom end of the oil conveying pipe (7) is fixed on the multi-roller straightener (5), and the top end of the oil conveying pipe (7) is communicated with the oil bath pipe (4).
9. A molybdenum-containing metal seamless small-diameter pipe, which is characterized in that the molybdenum-containing metal seamless small-diameter pipe is prepared by adopting the preparation method of the molybdenum-containing metal seamless small-diameter pipe according to any one of claims 1 to 8, wherein the wall thickness of the molybdenum-containing metal seamless small-diameter pipe is 0.3mm ±0.05mm～0.8mm±0.1mm, and the outer diameter of the molybdenum-containing metal seamless small-diameter pipe is 3.17mm ±0.05mm～6.35 mm±0.05mm.
10. Use of a molybdenum-containing metal seamless slim tube as in claim 9 for the preparation of a thermocouple.
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| CN115090739B (en) * | 2022-06-10 | 2023-03-31 | 西安交通大学 | Device for preparing thin-wall seamless tube by inward spinning |
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| CN101733304A (en) * | 2008-11-25 | 2010-06-16 | 北京有色金属研究总院 | TiNi base shape memory alloy tube hydraulic extrusion moulding method |
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