CN110711775A - Titanium alloy pipe manufacturing and forming method - Google Patents
Titanium alloy pipe manufacturing and forming method Download PDFInfo
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- CN110711775A CN110711775A CN201911026808.6A CN201911026808A CN110711775A CN 110711775 A CN110711775 A CN 110711775A CN 201911026808 A CN201911026808 A CN 201911026808A CN 110711775 A CN110711775 A CN 110711775A
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- rolling
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000005096 rolling process Methods 0.000 claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 230000007547 defect Effects 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 239000002253 acid Substances 0.000 claims abstract description 6
- 238000007781 pre-processing Methods 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- 238000005406 washing Methods 0.000 claims abstract description 6
- 238000000465 moulding Methods 0.000 claims abstract 3
- 238000005238 degreasing Methods 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000005237 degreasing agent Methods 0.000 claims description 5
- 239000013527 degreasing agent Substances 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 238000004513 sizing Methods 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 abstract description 3
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000005098 hot rolling Methods 0.000 abstract description 2
- 230000006698 induction Effects 0.000 abstract description 2
- 238000007689 inspection Methods 0.000 abstract 1
- 238000004886 process control Methods 0.000 abstract 1
- 238000004088 simulation Methods 0.000 abstract 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 6
- 239000010936 titanium Substances 0.000 description 6
- 229910052719 titanium Inorganic materials 0.000 description 6
- 230000009471 action Effects 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- -1 and 3 Chemical compound 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/06—Rolling hollow basic material, e.g. Assel mills
- B21B19/10—Finishing, e.g. smoothing, sizing, reeling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention provides a method for manufacturing and molding a titanium alloy pipe, and relates to the technical field of manufacturing and molding of titanium alloy pipes. Preparing a plurality of pipe blanks, and then preprocessing the pipe blanks; the pretreatment comprises the following steps: the invention discloses a method for controlling the surface quality of a round billet by using a stainless steel pipe rolling process, which comprises the steps of carrying out quarantine inspection on the round billet to determine that the surface of the round billet has defects, then using a hot rolled steel coil as a raw material, carrying out cold continuous rolling after removing oxide skins by acid washing, adopting the working procedures of oblique rolling extension and micro-stretch reducing to enable the processed pipe billet to have longer size so as to select the most appropriate temperature, simultaneously adopting the micro-stretch reducing technology to improve the surface quality and size precision of the cold-processed pipe billet, carrying out induction heating or gas heating for temperature compensation before hot rolling on a perforated pipe billet, thus assisting the implementation of the scheme, optimizing the stainless steel pipe rolling process by using a simulation result, and carrying out whole-process control on the rolling process by using an automatic control.
Description
Technical Field
The invention relates to the technical field of titanium alloy pipe manufacturing and forming, in particular to a titanium alloy pipe manufacturing and forming method.
Background
The titanium alloy pipe is a common pipe, most of the existing titanium alloy pipes have gaps, so that the titanium alloy pipes are influenced by the gaps in practical use and can be broken, the actual use value of the pipes can be greatly reduced, and the manufacturing of the slotted pipes is troublesome, so that the manufacturing and forming method of the titanium alloy pipes with seamless manufacturing and higher use value can be designed.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a method for manufacturing and forming a titanium alloy pipe, which achieves the purposes of seamless manufacture and higher use value.
(II) technical scheme
In order to achieve the purpose of seamless manufacture and higher use value, the invention provides the following technical scheme: a titanium alloy tube manufacturing and forming method comprises the following steps:
s1, preparing a plurality of pipe blanks, and then preprocessing the pipe blanks;
the pretreatment comprises the following steps:
(1) quarantining the tube blank to determine that the surface of the round blank has defects;
(2) removing a surface skin layer of the pipe blank, wherein the thickness range of the removed surface skin layer is 0.5-1.5 mm;
(3) then, carrying out surface grinding and polishing on the pipe blank;
(4) cleaning the tube blank by using soapy water to remove impurities on the surface;
(5) degreasing and degreasing the tube blank by using a degreasing agent, and then wiping off surface impurities;
s2, heating the pretreated pipe blank to a certain temperature, and putting the pipe blank into a heat preservation chamber with proper temperature;
putting the tube blank into a high-temperature furnace, and then heating the tube blank to 700-900 ℃ within 60-80 minutes;
then uniformly heating the whole pipe blank, and heating for 60 minutes in an environment of 1000 ℃ and 1200 ℃;
s3, if the pipe blank is not straight, the pipe blank is bent or multi-bent, and the pipe blank is straightened by a straightening machine;
the roller of the piercing mill rotates in the same direction, the axis of the roller inclines relative to the rolling line, after the round pipe blank enters the roller, on one hand, the round pipe blank is driven by the friction force between metal and the roller to rotate in the direction opposite to the rotating direction of the roller, and meanwhile, because the axis of the roller has an inclination angle (advancing angle) relative to the axis of the pipe blank (rolling axis), the pipe blank moves along the axial direction, then moves spirally and extends in a skew rolling way;
s4, after micro-tension reducing is carried out by using a tension reducing mill and a sizing mill, the hot rolled steel coil is used as a raw material, and after oxide skin is removed by acid washing, cold continuous rolling is carried out, so that the strength and the hardness are increased, and the tough-plastic index is reduced;
s5, cooling the finished pipe to ensure that the pipe is taken out without phase change;
s6, drying the cooled pipe finished product in a hot air blower type at 20-40 ℃;
s7, and storing the finished product for other needs.
(III) advantageous effects
Compared with the prior art, the invention provides a method for manufacturing and forming a titanium alloy pipe, which has the following beneficial effects:
1. the invention adopts the working procedures of oblique rolling extension and micro-stretch reducing, so that the processed pipe blank has longer size, high yield, good surface quality and small grinding amount, and different temperatures are adopted for processing, thereby selecting the most suitable temperature.
Drawings
FIG. 1 is a block diagram of the present invention;
Detailed Description
Please refer to FIG. 1, example 1
A manufacturing and forming method of a titanium alloy pipe comprises the following steps:
s1, preparing a plurality of pipe blanks, and then preprocessing the pipe blanks;
the pretreatment comprises the following steps:
(1) quarantining the tube blank to determine that the surface of the round blank has defects;
(2) removing a surface skin layer of the pipe blank, wherein the thickness range of the removed surface skin layer is 0.5-1.5 mm;
(3) then, carrying out surface grinding and polishing on the pipe blank;
(4) cleaning the tube blank by using soapy water to remove impurities on the surface;
(5) degreasing and degreasing the tube blank by using a degreasing agent, and then wiping off surface impurities;
s2, heating the pretreated pipe blank to a certain temperature, and putting the pipe blank into a heat preservation chamber with proper temperature;
putting the tube blank into a high-temperature furnace, and then heating the tube blank to 700-900 ℃ within 60-80 minutes;
then uniformly heating the whole pipe blank, and heating for 60 minutes in an environment of 1000 ℃ and 1200 ℃;
s3, if the pipe blank is not straight, the pipe blank is bent or multi-bent, and the pipe blank is straightened by a straightening machine;
the roller of the piercing mill rotates in the same direction, the axis of the roller inclines relative to the rolling line, after the round pipe blank enters the roller, on one hand, the round pipe blank is driven by the friction force between metal and the roller to rotate in the direction opposite to the rotating direction of the roller, and meanwhile, because the axis of the roller has an inclination angle (advancing angle) relative to the axis of the pipe blank (rolling axis), the pipe blank moves along the axial direction, then moves spirally and extends in a skew rolling way;
s4, after micro-tension reducing is carried out by using a tension reducing mill and a sizing mill, the hot rolled steel coil is used as a raw material, and after oxide skin is removed by acid washing, cold continuous rolling is carried out, so that the strength and the hardness are increased, and the tough-plastic index is reduced;
s5, cooling the finished pipe to ensure that the pipe is taken out without phase change;
s6, drying the cooled pipe finished product in a hot air blower type at 20-40 ℃;
s7, and storing the finished product for other needs.
Example 2
A manufacturing and forming method of a titanium alloy pipe comprises the following steps:
s1, preparing a plurality of pipe blanks, and then preprocessing the pipe blanks;
the pretreatment comprises the following steps:
(1) quarantining the tube blank to determine that the surface of the round blank has defects;
(2) removing a surface skin layer from the pipe blank, wherein the thickness range of the removed surface skin layer is 0.8 mm;
(3) then, carrying out surface grinding and polishing on the pipe blank;
(4) cleaning the tube blank by using soapy water to remove impurities on the surface;
(5) degreasing and degreasing the tube blank by using a degreasing agent, and then wiping off surface impurities;
s2, heating the pretreated pipe blank to a certain temperature, and putting the pipe blank into a heat preservation chamber with proper temperature;
putting the tube blank into a high-temperature furnace, and then heating the tube blank to 750 ℃ within 65 minutes;
then uniformly heating the whole pipe blank, and heating for 60 minutes in an environment of 1000 ℃;
s3, if the pipe blank is not straight, the pipe blank is bent or multi-bent, and the pipe blank is straightened by a straightening machine;
the roller of the piercing mill rotates in the same direction, the axis of the roller inclines relative to the rolling line, after the round pipe blank enters the roller, on one hand, the round pipe blank is driven by the friction force between metal and the roller to rotate in the direction opposite to the rotating direction of the roller, and meanwhile, because the axis of the roller has an inclination angle (advancing angle) relative to the axis of the pipe blank (rolling axis), the pipe blank moves along the axial direction, then moves spirally and extends in a skew rolling way;
s4, after micro-tension reducing is carried out by using a tension reducing mill and a sizing mill, the hot rolled steel coil is used as a raw material, and after oxide skin is removed by acid washing, cold continuous rolling is carried out, so that the strength and the hardness are increased, and the tough-plastic index is reduced;
s5, cooling the finished pipe to ensure that the pipe is taken out without phase change;
s6, drying the cooled pipe finished product in a hot air blower type at 20-40 ℃;
s7, and storing the finished product for other needs.
Example 3
A manufacturing and forming method of a titanium alloy pipe comprises the following steps:
s1, preparing a plurality of pipe blanks, and then preprocessing the pipe blanks;
the pretreatment comprises the following steps:
(1) quarantining the tube blank to determine that the surface of the round blank has defects;
(2) removing a surface skin layer from the pipe blank, wherein the thickness range of the removed surface skin layer is 0.9 mm;
(3) then, carrying out surface grinding and polishing on the pipe blank;
(4) cleaning the tube blank by using soapy water to remove impurities on the surface;
(5) degreasing and degreasing the tube blank by using a degreasing agent, and then wiping off surface impurities;
s2, heating the pretreated pipe blank to a certain temperature, and putting the pipe blank into a heat preservation chamber with proper temperature;
putting the tube blank into a high-temperature furnace, and then heating the tube blank to 800 ℃ within 60 minutes;
then uniformly heating the whole pipe blank, and heating for 60 minutes in an environment of 1100 ℃;
s3, if the pipe blank is not straight, the pipe blank is bent or multi-bent, and the pipe blank is straightened by a straightening machine;
the roller of the piercing mill rotates in the same direction, the axis of the roller inclines relative to the rolling line, after the round pipe blank enters the roller, on one hand, the round pipe blank is driven by the friction force between metal and the roller to rotate in the direction opposite to the rotating direction of the roller, and meanwhile, because the axis of the roller has an inclination angle (advancing angle) relative to the axis of the pipe blank (rolling axis), the pipe blank moves along the axial direction, then moves spirally and extends in a skew rolling way;
s4, after micro-tension reducing is carried out by using a tension reducing mill and a sizing mill, the hot rolled steel coil is used as a raw material, and after oxide skin is removed by acid washing, cold continuous rolling is carried out, so that the strength and the hardness are increased, and the tough-plastic index is reduced;
s5, cooling the finished pipe to ensure that the pipe is taken out without phase change;
s6, drying the cooled pipe finished product in a hot air blower type at 20-40 ℃;
s7, and storing the finished product for other needs.
The scheme adopts the working procedures of oblique rolling extension and micro-stretch reducing, so that the processed pipe blank has longer size, high yield, good surface quality and small grinding amount, and is processed at different temperatures, so that the most suitable temperature can be selected, meanwhile, the micro-stretch reducing technology is adopted, the surface quality and the size precision of the cold-processed pipe blank are improved, the perforated pipe blank is subjected to induction heating or gas heating for temperature compensation before hot rolling, and the uniformity of the temperature of the pipe blank before oblique rolling extension is ensured.
The titanium alloy pipe is made of titanium alloy, the titanium alloy can be divided into three types according to the structure, (1, aluminum and tin are added in titanium, 2, aluminum, chromium, molybdenum, vanadium and other alloy elements are added in titanium, and 3, aluminum, vanadium and other elements are added in titanium), the titanium alloy pipe has high mechanical property and excellent stamping property, and can be welded in various forms, the strength of a welded joint can reach 90% of that of a base metal, and the cutting processing property is good. The titanium tube has high corrosion resistance to chloride, sulfide and ammonia. Titanium has higher corrosion resistance in seawater than aluminum alloy, stainless steel and nickel-based alloy. The titanium also has strong water impact resistance.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. A titanium alloy tube manufacturing and forming method is characterized in that: the manufacturing and molding method comprises the following steps:
s1, preparing a plurality of pipe blanks, and then preprocessing the pipe blanks;
the pretreatment comprises the following steps:
(1) quarantining the tube blank to determine that the surface of the round blank has defects;
(2) removing a surface skin layer of the pipe blank, wherein the thickness range of the removed surface skin layer is 0.5-1.5 mm;
(3) then, carrying out surface grinding and polishing on the pipe blank;
(4) cleaning the tube blank by using soapy water to remove impurities on the surface;
(5) degreasing and degreasing the tube blank by using a degreasing agent, and then wiping off surface impurities;
s2, heating the pretreated pipe blank to a certain temperature, and putting the pipe blank into a heat preservation chamber with proper temperature;
putting the tube blank into a high-temperature furnace, and then heating the tube blank to 700-900 ℃ within 60-80 minutes;
then uniformly heating the whole pipe blank, and heating for 60 minutes in an environment of 1000 ℃ and 1200 ℃;
s3, if the pipe blank is not straight, the pipe blank is bent or multi-bent, and the pipe blank is straightened by a straightening machine;
the roller of the piercing mill rotates in the same direction, the axis of the roller inclines relative to the rolling line, after the round pipe blank enters the roller, on one hand, the round pipe blank is driven by the friction force between metal and the roller to rotate in the direction opposite to the rotating direction of the roller, and meanwhile, because the axis of the roller has an inclination angle (advancing angle) relative to the axis of the pipe blank (rolling axis), the pipe blank moves along the axial direction, then moves spirally and extends in a skew rolling way;
s4, after micro-tension reducing is carried out by using a tension reducing mill and a sizing mill, the hot rolled steel coil is used as a raw material, and after oxide skin is removed by acid washing, cold continuous rolling is carried out, so that the strength and the hardness are increased, and the tough-plastic index is reduced;
s5, cooling the finished pipe to ensure that the pipe is taken out without phase change;
s6, drying the cooled pipe finished product in a hot air blower type at 20-40 ℃;
s7, and storing the finished product for other needs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911026808.6A CN110711775A (en) | 2019-10-26 | 2019-10-26 | Titanium alloy pipe manufacturing and forming method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911026808.6A CN110711775A (en) | 2019-10-26 | 2019-10-26 | Titanium alloy pipe manufacturing and forming method |
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| CN110711775A true CN110711775A (en) | 2020-01-21 |
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| CN201911026808.6A Pending CN110711775A (en) | 2019-10-26 | 2019-10-26 | Titanium alloy pipe manufacturing and forming method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114433634A (en) * | 2021-12-06 | 2022-05-06 | 苏州航顺钛合金制品有限公司 | Method for manufacturing titanium alloy pipe |
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-
2019
- 2019-10-26 CN CN201911026808.6A patent/CN110711775A/en active Pending
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Non-Patent Citations (1)
| Title |
|---|
| 张翥: "《钛材塑性加工技术》", 31 May 2010 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114433634A (en) * | 2021-12-06 | 2022-05-06 | 苏州航顺钛合金制品有限公司 | Method for manufacturing titanium alloy pipe |
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Application publication date: 20200121 |