CN114602996B - Manufacturing method of ultrathin seamless tube for high-end equipment system - Google Patents
Manufacturing method of ultrathin seamless tube for high-end equipment system Download PDFInfo
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- CN114602996B CN114602996B CN202210299051.3A CN202210299051A CN114602996B CN 114602996 B CN114602996 B CN 114602996B CN 202210299051 A CN202210299051 A CN 202210299051A CN 114602996 B CN114602996 B CN 114602996B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B23/00—Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/30—Finishing tubes, e.g. sizing, burnishing
Abstract
A method for manufacturing an ultrathin seamless tube for a high-end equipment system comprises the steps of multi-pass intermediate cold rolling of a tube blank, intermediate degreasing, finish rolling and forming, finished product degreasing, pure hydrogen protection solution treatment, low-stress straightening, surface finish polishing and shaping, protective atmosphere follow-up clamping stress relief, finished product fixed cutting, inner and outer surface cleaning and the like. The wall thickness ratio of the outer diameter to the wall thickness of the ultrathin tube manufactured by the method is 80 to 150 times, the outer diameter scope phi is 20 to 35mm, the wall thickness scope is 0.10 to 0.35mm, the tolerance of the outer diameter and the wall thickness is +/-0.01 mm, and the straightness is less than or equal to 0.05 mm/full length. And can meet the performance requirements that the tensile strength of the austenitic stainless steel is more than or equal to 220MPa at the high temperature of 750 ℃ and the yield strength is more than or equal to 100 MPa.
Description
Technical Field
The invention belongs to the technical field of processing of key materials for high-end equipment and novel energy systems, and particularly relates to a manufacturing method of an ultrathin seamless tube for a high-end equipment system.
Background
With the development of science and technology, various equipment designs also put more stringent requirements on the size while pursuing performance advancement, especially in the field of high-end equipment represented by aerospace and novel nuclear energy systems. In the field of aerospace, miniaturization, light weight and high precision are inevitably pursued due to the particularity of working conditions and environment and the sensitivity to the weight of materials. On the other hand, as the application of nuclear energy systems is more and more extensive, the nuclear energy systems are not only limited to large-scale civil power stations for power generation, but also applied to various special fields with more rigorous requirements on energy systems, high-efficiency, miniaturization and lightweight design are required, and special requirements including corrosion resistance, high-temperature radiation resistance and the like are also provided for key materials of core components of the nuclear energy systems. Therefore, on the premise of meeting performance requirements, the requirements on specification design break through the conventional requirements, and the requirements of ultrathin pipes and ultrathin pipes are more and more urgent.
Due to the particularity of the use environment, the pipe is required to have higher high-temperature strength, the conventional strength improving mode is to increase the contents of C and N elements, but the content of the C element is too high, the corrosion performance is reduced, and elements such as Ti and the like need to be improved synchronously. C. The contents of Ti and N elements are synchronously increased, the possibility of generating inclusions such as titanium carbonitride and the like is increased, the contents of the inclusions are too high, and the extremely thin pipe has use risks. Therefore, the control of the content of elements and inclusions is a comprehensive difficulty, and strict control is required to find a balance point.
The ratio of the outer diameter to the wall thickness of a common cold-rolled seamless precise pipe is 5 to 20; the ratio of the outer diameter to the wall thickness is more than 20, the pipe is called a thin-wall pipe, and the cold rolling forming process needs special control; the ultra-thin pipe with the outer diameter wall thickness ratio of more than 40 is more difficult to form by cold rolling; the cold-rolled seamless pipe with the outer diameter-wall thickness ratio of more than 60 times is rarely reported at home and abroad. The outer diameter-wall thickness ratio of the ultrathin seamless tube for the high-end equipment system related by the method reaches 80 to 150 times, and the absolute value of the wall thickness is only 0.10 to 0.35mm. Generally, the pipes with similar specifications are welded and formed by adopting ultrathin steel strips, and the cold rolling seamless forming technology is not selected. However, the product is a pipe for a high-end equipment system, the use working condition is special, the welding seam in the middle of the pipe is not allowed, only cold-rolled seamless pipes can be used, and the mature technology is not available at home at present.
The seamless pipe for the high-end equipment system has high precision requirement. The tolerance of the outer diameter and the wall thickness is only +/-0.01 mm, and the straightness is required to be less than or equal to 0.05 mm/full length and is far higher than the requirements of the conventional seamless precise pipe on the outer diameter and the wall thickness with the tolerance of +/-0.1 mm and the straightness is less than or equal to 1 mm/full length. The performance is special, the tensile strength at 750 ℃ is required to be more than or equal to 220MPa, the yield strength is required to be more than or equal to 100MPa, and the test temperature is far higher than the test temperature (about 350 ℃) of the prior austenitic stainless steel pipe. The inclusion content is strictly required.
In order to realize the lightweight design of the high-end equipment system and meet the high-precision requirement, the development of an extremely thin seamless cold rolled tube and a manufacturing technology thereof which can realize the requirements of higher precision and higher performance is urgently needed.
Disclosure of Invention
The invention aims to provide a method for manufacturing an extremely thin seamless tube for a high-end equipment system, which can meet the requirements of high precision and special requirements on physical and chemical properties of the seamless tube for the high-end equipment system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for manufacturing an extremely thin seamless pipe for a high-end equipment system, characterized by comprising the steps of:
(1) Cold rolling a pipe blank with the outer diameter of 65-90mm to a semi-finished product with the outer diameter of 25-38mm through a multi-pass intermediate product, and degreasing and cleaning the pipe blank after each cold rolling through the intermediate product;
(2) Finish rolling the semi-finished pipe in the step (1) into a finished straight pipe with the outer diameter of 20 to 35mm and the wall thickness of 0.10 to 0.35mm by a high-precision multi-roll finishing mill; degreasing the inside and the outside, and cleaning;
(3) Carrying out finished product solution heat treatment on the clean finished product straight pipe in the step (2) by a pure hydrogen protective heat treatment furnace;
(4) Performing low-stress straightening on the finished straight pipe subjected to the heat treatment in the step (3);
(5) The finished product straight pipe is supported by the inside and the outer surface is polished finely;
(6) Carrying out follow-up clamping on the finished product straight pipe after finish polishing, and carrying out stress relief heat treatment on the ultrathin pipe in an electric heating mode;
(7) And (4) carrying out fixed cutting, inspection and inner and outer surface cleaning on the finished straight pipe in the step (6) to finish the manufacture of the ultrathin seamless pipe.
It is further characterized in that: and (4) adopting a compression roller type straightener, controlling the compression roller reduction amount to be epsilon = (0.02 to 0.05) DS, wherein D is the nominal outer diameter of the finished straight pipe, and S is the nominal wall thickness value of the finished product. Because the wall thickness of the finished straight pipe is very thin, the pipe wall is easy to deform due to overlarge pressing amount in the straightening process. According to the straightness of the incoming material and the size of the finished product pipe, a special straightening machine is used to carry out low-stress straightening on the finished product ultrathin pipe by using the principles of 'bending straightening' and 'out-of-round straightening', and the rolling reduction is strictly controlled according to the specific formula, so that the high-precision requirement that the straightness of the product is less than or equal to 0.05 mm/full length is realized.
Further: the internal support in the step (5) adopts a tensioning type inner core; the tensioning type inner core comprises an outer cylinder, an inner cylinder and a plurality of arc-shaped supporting plates, wherein the outer cylinder and the inner cylinder can move relatively, and the arc-shaped supporting plates are matched with the inner wall of the finished straight pipe in shape; the supporting plate is connected with the inner cylinder and the outer cylinder through two connecting rods to form a four-bar mechanism; one ends of the two connecting rods are respectively pivoted on the supporting plate, and the other ends of the two connecting rods are respectively pivoted on the outer barrel and the inner barrel. During polishing, the inner cylinder and the outer cylinder move relatively, the supporting plate is supported to support the inside of the finished straight pipe, and stress deformation and rotation out-of-round of the steel pipe during polishing are prevented.
And further: and (6) clamping the two ends of the finished straight pipe by adopting a follow-up clamping device, wherein the follow-up clamping device comprises clamping slide blocks which are arranged at the two ends of the finished straight pipe, and the clamping slide blocks are arranged on a bottom guide rail and can axially move along the finished straight pipe. The ultra-thin pipe is subjected to stress relief heat treatment in an electric heating mode, so that residual stress in the wall thickness direction of the pipe in straightening and polishing processes is removed, the corrosion resistance of the pipe is further improved, and the appearance is solidified. Aiming at the characteristics of the ultrathin tube, the servo clamping of the two heating electrodes is realized through the servo clamping device, so that the stability of the straightness of the tube in the heating process is ensured, and the current breakdown caused by unstable clamping is avoided.
Preferably: the deformation of each pass of rolling in the step (1) is 60-80%; and carrying out heat treatment on the intermediate product at the heat preservation temperature of 1050-1100 ℃ after each cold rolling.
Preferably, the following components: the rolling deformation in the step (2) is 40-50%.
Preferably: the temperature of the solution heat treatment in the step (3) is 1060-1120 ℃.
Preferably: the fine polishing sand paper in the step (5) is limited to 300 to 500 meshes, and the removal amount is controlled to be 0.005 to 0.010mm. The surface quality is improved, and meanwhile, the roundness is further optimized.
Preferably: the method is characterized in that: and (6) adopting high-precision go gauges, no-go gauges and ring gauges for final inspection. Because the requirement on the size precision of the ultrathin seamless tube is high, the conventional measurement mode can only measure the size of the end, and the pass gauge, the no-go gauge and the ring gauge can be used for more intuitively judging whether the tube is qualified or not, so that the measurement difficulty is reduced, and the production efficiency is greatly improved.
Preferably: the cleaning mode of the outer surface of the straight pipe in the step (7) is that cotton cloth dipped with acetone or alcohol is used for wiping the outer surface of the alloy pipe one by one until the outer surface does not have color spots caused by oil stains and foreign matters, and finally, dry white cotton cloth is used for wiping the outer surface; the inner surface cleaning method comprises cleaning the wool felt plugs by branches by blowing compressed air into the pipe holes, until the cleaned wool felt plugs have no oil stain or color spots caused by foreign matters, and finally wiping the wool felt plugs or white cotton cloth with dry wool felt plugs.
Aiming at the characteristics of an extremely thin pipe, the invention can fully correct the nonuniformity of the structure and the wall thickness of the pipe blank by multi-pass large-deformation intermediate product cold rolling, degreasing and heat treatment, and ensure that the straight pipes to be finished product cold rolled have uniform size and consistent performance. The rolling reduction is strictly controlled in the straightening process, and the requirement of linearity and high precision is met under the condition that the product is not deformed. A high-precision polishing machine is used, and a supporting tool is used for supporting the inside of the extremely thin seamless tube, so that rotation out-of-round in the polishing process is prevented. The follow-up device is designed to realize follow-up clamping of the two heating electrodes, so that the stability of the straightness of the pipe in the heating process is ensured, and the current breakdown caused by unstable clamping is avoided. The wall thickness ratio of the outer diameter to the wall thickness of the ultrathin tube manufactured by the method is 80 to 150 times, the outer diameter scope phi is 20 to 35mm, the wall thickness scope is 0.10 to 0.35mm, the tolerance of the outer diameter and the wall thickness is +/-0.01 mm, and the straightness is less than or equal to 0.05 mm/full length. And can meet the performance requirements that the tensile strength of the austenitic stainless steel is more than or equal to 220MPa at the high temperature of 750 ℃ and the yield strength is more than or equal to 100 MPa.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention.
FIG. 2 is a schematic diagram of the straightening process of the present invention.
FIG. 3 is a view showing the amount of reduction in the straightening process.
Fig. 4a and 4b are side views of the tension type inner core in the initial state and the use state.
Fig. 5 is a cross-sectional comparison of the initial state and the use state of the tension type inner core.
FIG. 6 is a side view of a stress relief heat treatment compliant clamp.
FIG. 7 is a diagram showing the working state of the stress-relieving heat treatment follow-up clamping device.
Detailed Description
An ultrathin seamless tube for a high-end equipment system is made of austenitic stainless steel, and mainly comprises the following control elements in percentage by mass: 0.07 to 0.12 percent of C, 1.8 to 2.0 percent of Mn, 5.5 to 0.7 percent of Ti and 0.008 to 0.012 percent of N, and the performance requirements that the tensile strength and the tensile strength of the austenitic stainless steel are more than or equal to 220MPa and the yield strength is more than or equal to 100MPa at the high temperature of 750 ℃ are realized through the above restriction. The wall thickness ratio of the outer diameter is 80 to 150 times, the outer diameter range is phi 20 to 35mm, the wall thickness range is 0.10 to 0.35mm, the allowable tolerance of the outer diameter and the wall thickness is +/-0.01 mm, and the straightness is less than or equal to 0.05 mm/full length.
As shown in fig. 1, a method for manufacturing an extremely thin seamless pipe for a high-end equipment system, comprising the steps of:
(1) The method comprises the steps of cold rolling a pipe blank with the outer diameter of 65-90mm through a multi-pass intermediate product, and then rolling the pipe blank to a semi-finished product with the outer diameter of 25-38mm, wherein the deformation of each pass of rolling is 60% -80%. After each cold rolling, intermediate products are degreased and cleaned, and the intermediate products are subjected to heat treatment (if necessary) at the heat preservation temperature of 1050-1100 ℃.
(2) And (3) finish rolling the semi-finished product pipe in the step (1) into a finished product straight pipe with the outer diameter phi of 20-35mm and the wall thickness of 0.10-0.35 mm by a high-precision multi-roll finishing mill, wherein the rolling deformation is 40% -50%. And adding a negative tolerance of about 1 ‰ D (D is a nominal outer diameter) to the size of the control target of the sizes of the inner diameter and the outer diameter of the finished straight pipe, and reserving allowance for the subsequent processing process, thereby ensuring the size precision requirement and consistency of the finished products.
(3) And (3) degreasing the inside and outside of the finished straight pipe in the step (2) by finished product degreasing equipment, cleaning, and wiping the inside and outside surfaces of the pipe.
(4) And (3) carrying out finished product solution heat treatment on the clean finished product straight pipe in the step (3) by using a pure hydrogen protection conveyor belt type heat treatment furnace, wherein the purity of hydrogen is more than or equal to 99.9%, the heat treatment is continuously carried out on the same batch of pipes in the same time period, the number of single-row pipes is less than or equal to 5, the consistency of the structure performance of the final finished product pipe is ensured, the heat treatment temperature of the finished product is 1060-1120 ℃, and the heat preservation time is 1-5 min. Meanwhile, in order to ensure the surface quality of the finished product pipe, non-rigid contact between the product and the conveying mesh belt is realized through a special tool.
(5) According to the straightness of incoming materials and the size of the finished pipe, straightening the finished straight pipe subjected to heat treatment in the step (4) under low stress by using a special straightening machine shown in figure 2 and using the principles of bend straightening and out-of-round straightening, wherein according to a specific formula, epsilon = (0.02 to 0.05) DS, D is a nominal outer diameter, S is a nominal wall thickness value, and the rolling reduction is strictly controlled (shown in figure 3), so that the high-precision requirement that the straightness of the product is less than or equal to 0.05 mm/full length is met.
(6) And (4) polishing the outer surface of the finished straight pipe in the step (5) by using a high-precision polishing machine, so as to further improve the surface quality. During polishing, the interior of the finished straight pipe is supported by a tensioning inner core as shown in fig. 4a, 4b and 5. The tension type inner core comprises an outer cylinder 1, an inner cylinder 2 and a plurality of arc-shaped supporting plates 3, wherein the outer cylinder and the inner cylinder can move relatively, and the arc-shaped supporting plates are matched with the inner wall of the finished straight pipe in shape. The supporting plate 3 is connected with the inner cylinder 1 and the outer cylinder 2 through two connecting rods 5 to form a four-bar mechanism; one ends of two connecting rods 5 are respectively pivoted on different positions of the supporting plate 3, and the other ends are respectively pivoted on the outer cylinder 1 and the inner cylinder 2. As shown in FIG. 5, during polishing, the inner cylinder 2 and the outer cylinder 1 move relatively, and the support plate 3 supports the inner wall of the finished straight pipe 4 to prevent the steel pipe from deforming under stress and rotating out of round during polishing. The fine polishing sand paper is limited to be 300-500 meshes, and the removal amount is controlled to be 0.005-0.010mm. The surface quality is improved, and meanwhile, the roundness is further optimized.
(7) The follow-up clamping device shown in figures 6 and 7 is used for realizing follow-up clamping on the finished straight pipe, and an electric heating mode is adopted for carrying out stress relief heat treatment on the ultrathin pipe. The follow-up clamping device comprises clamping sliding blocks 6 which are arranged at two ends of the finished straight pipe 4 in a clamping mode, and the clamping sliding blocks 6 are arranged on a bottom guide rail 7 and can move along the axial direction of the finished straight pipe 4. And (3) carrying out stress relief heat treatment on the ultrathin pipe by adopting electric heating equipment, removing residual stress of straightening and polishing processes in the wall thickness direction of the pipe, further improving the corrosion resistance of the pipe, and solidifying the appearance. Not only ensures the stability of the pipe straightness in the heating process, but also avoids the current breakdown caused by unstable clamping.
(8) And (4) carrying out final fixed cutting on the finished product pipe subjected to stress relief heat treatment in the step (7) by a numerical control wire cutting machine and a positioning tool. The finished product pipe after polishing is subjected to fixed-length pipe cutting by using the numerical control wire cutting machine, the end face verticality can be ensured by using the positioning tool, the length of the finished product pipe can meet the requirement, batch operation is facilitated, and the production efficiency is improved.
(9) And (5) carrying out surface quality and dimension inspection on the finished pipe in the step (8) through a designed go gauge, a no-go gauge and a ring gauge. Because the requirement on the size precision of the ultrathin seamless tube is high, the conventional measurement mode can only measure the size of the end, and the pass gauge, the no-go gauge and the ring gauge can be used for more intuitively judging whether the tube is qualified or not, so that the measurement difficulty is reduced, and the production efficiency is greatly improved.
(10) Cleaning the outer surface: and wiping the outer surface of the alloy pipe with cotton cloth dipped with acetone or alcohol one by one until the outer surface is free from oil stains and color spots caused by foreign matters, and finally wiping the alloy pipe clean with dry white cotton cloth. Cleaning the inner surface: and blowing the white wool felt plugs dipped with acetone or alcohol into the pipe holes by compressed air one by one to clean until the surfaces of the cleaned wool felt plugs are free of oil stains and color spots caused by foreign matters, and finally wiping the wool felt plugs or the white cotton cloth with dry wool felt plugs or white cotton cloth.
(11) And (5) protecting the finished product pipe with qualified cleanliness in the step (10) through a protection tool, and then boxing.
Claims (8)
1. A method for manufacturing an extremely thin seamless pipe for a high-end equipment system, characterized by comprising the steps of:
(1) Cold rolling a pipe blank with the outer diameter of 65-90mm to a semi-finished product with the outer diameter of 25-38mm through a multi-pass intermediate product, and degreasing and cleaning the pipe blank after each cold rolling through the intermediate product;
(2) Finish rolling the semi-finished pipe in the step (1) into a finished straight pipe with the outer diameter of 20 to 35mm and the wall thickness of 0.10 to 0.35mm by a high-precision multi-roll finishing mill; degreasing inside and outside, and cleaning;
(3) Carrying out finished product solution heat treatment on the clean finished product straight pipe in the step (2) by a pure hydrogen protective heat treatment furnace;
(4) Performing low-stress straightening on the finished straight pipe subjected to the heat treatment in the step (3); the straightening adopts a compression roller type straightener, the compression roller reduction amount is controlled to be epsilon = (0.02 to 0.05) DS, D is the nominal outer diameter of the finished straight pipe, and S is the nominal wall thickness of the finished straight pipe;
(5) The finished product straight pipe is supported through the inside, and the outer surface of the finished product straight pipe is subjected to fine polishing;
(6) Carrying out follow-up clamping on the finished product straight pipe after the finish polishing, and carrying out stress relief heat treatment on the finished product straight pipe by adopting an electric heating mode; clamping two ends of a finished straight pipe by adopting a follow-up clamping device, wherein the follow-up clamping device comprises clamping slide blocks which are arranged at two ends of the finished straight pipe, and the clamping slide blocks are arranged on a bottom guide rail and can move along the axial direction of the finished straight pipe;
(7) And (4) performing fixed cutting, inspection and inner and outer surface cleaning on the finished straight pipe in the step (6) to finish the manufacturing of the ultrathin seamless pipe.
2. The method for producing an extremely thin seamless pipe for a high-end equipment system according to claim 1, characterized in that: the internal support in the step (5) adopts a tensioning type inner core; the tensioning type inner core comprises an outer cylinder, an inner cylinder and a plurality of arc-shaped supporting plates matched with the inner wall of the finished straight pipe in shape, wherein the outer cylinder and the inner cylinder can move relatively; the arc-shaped supporting plate is connected with the inner cylinder and the outer cylinder through two connecting rods to form a four-bar mechanism; one ends of the two connecting rods are respectively pivoted on the arc-shaped supporting plate, and the other ends of the two connecting rods are respectively pivoted on the outer barrel and the inner barrel.
3. The method for manufacturing an extremely thin seamless pipe for a high-end equipment system according to claim 1 or 2, wherein: the deformation of each pass of rolling in the step (1) is 60-80%; and carrying out heat treatment on the intermediate product at the heat preservation temperature of 1050-1100 ℃ after each cold rolling.
4. The method for manufacturing an extremely thin seamless pipe for a high-end equipment system according to claim 1 or 2, characterized in that: the rolling deformation in the step (2) is 40% -50%.
5. The method for manufacturing an extremely thin seamless pipe for a high-end equipment system according to claim 1 or 2, wherein: the temperature of the solution heat treatment in the step (3) is 1060-1120 ℃.
6. The method for manufacturing an extremely thin seamless pipe for a high-end equipment system according to claim 1 or 2, wherein: the fine polishing sand paper in the step (5) is limited to 300 to 500 meshes, and the removal amount is controlled to be 0.005 to 0.010mm.
7. The method for manufacturing an extremely thin seamless pipe for a high-end equipment system according to claim 1 or 2, wherein: and (7) adopting high-precision go gauges, no-go gauges and ring gauges to carry out final inspection.
8. The method for manufacturing an extremely thin seamless pipe for a high-end equipment system according to claim 1 or 2, characterized in that: the cleaning mode of the outer surface of the finished straight pipe in the step (7) is that cotton cloth dipped with acetone or alcohol is used for wiping the outer surface of the finished straight pipe one by one until the outer surface is free of oil stains and color spots caused by foreign matters, and finally, dry white cotton cloth is used for wiping the outer surface; the inner surface cleaning method comprises cleaning by blowing compressed air into the pipe hole with white felt plug dipped with acetone or alcohol until the cleaned felt plug has no color spots caused by oil contamination and foreign matters, and wiping with dry felt plug or white cotton cloth.
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| CN202210299051.3A CN114602996B (en) | 2022-03-25 | 2022-03-25 | Manufacturing method of ultrathin seamless tube for high-end equipment system |
| PCT/CN2022/107060 WO2023178894A1 (en) | 2022-03-25 | 2022-07-21 | Manufacturing method of ultra-thin seamless tube for high-end equipment system |
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| CN202210299051.3A CN114602996B (en) | 2022-03-25 | 2022-03-25 | Manufacturing method of ultrathin seamless tube for high-end equipment system |
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| CN114602996B (en) * | 2022-03-25 | 2023-01-24 | 宝银特种钢管有限公司 | Manufacturing method of ultrathin seamless tube for high-end equipment system |
| CN115584444A (en) * | 2022-10-17 | 2023-01-10 | 江苏图南合金股份有限公司 | 321 type heat-resistant stainless steel precision thin-walled tube and manufacturing method thereof |
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| WO2023178894A1 (en) | 2023-09-28 |
| CN114602996A (en) | 2022-06-10 |
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