CN112139764A - Preparation method of titanium alloy oil well pipe - Google Patents
Preparation method of titanium alloy oil well pipe Download PDFInfo
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- CN112139764A CN112139764A CN202010928080.2A CN202010928080A CN112139764A CN 112139764 A CN112139764 A CN 112139764A CN 202010928080 A CN202010928080 A CN 202010928080A CN 112139764 A CN112139764 A CN 112139764A
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- titanium alloy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention discloses a preparation method of a titanium alloy oil well pipe, which comprises the steps of selecting a titanium alloy blank with the diameter being more than 20cm of a required oil pipe, cutting the selected blank into a titanium alloy blank rod with the length being more than 5m of the required oil pipe through a cutting machine, clamping the selected titanium alloy blank rod on a lathe, firstly turning the surface of the titanium alloy blank rod by 1-2 mm through a turning tool of the lathe, turning two end faces of the titanium alloy blank rod by 1-2 mm through turning tools, and finally obtaining a titanium alloy rough blank rod. The preparation method of the titanium alloy oil well pipe can work in humid atmosphere and seawater medium according to the titanium alloy, and the corrosion resistance of the titanium alloy oil well pipe is far superior to that of stainless steel; the resistance to pitting corrosion, acid corrosion and stress corrosion is particularly strong; the oil well pipe has the characteristics of excellent corrosion resistance to alkali, chloride, chlorine organic matters, nitric acid, sulfuric acid and the like, and can effectively solve the problems that the traditional oil well pipe is short in service life, poor in pressure resistance and corrosion resistance and incapable of effectively adapting to various severe environments.
Description
Technical Field
The invention relates to the technical field of titanium alloy oil well pipes, in particular to a preparation method of a titanium alloy oil well pipe.
Background
The development of the petroleum industry is rapid, and the demand for oil well pipes is increasing day by day. In 2006, about 1150 million t of oil well pipes were consumed all over the world. According to the statistical data of China, about 62kg of oil well pipes are needed when the actual drilling well drills 1m, and the oil well pipes account for about 60% of oil field equipment assets. Oil well pipes occupy an important place in the oil industry and are the foundation of the oil industry. The oil well pipe is in great use amount and cost in the oil industry, and has important relationship between the quality and performance and the development of the oil industry. Oil well pipes are subjected to severe service conditions, such as internal or external pressure of several hundred or even thousands of atmospheres, tensile loads of several hundred tons, and high temperatures and harsh corrosive media.
The existing oil well pipe has short service life, poor compression resistance and corrosion resistance and can not effectively adapt to various severe environments, so that the invention of the titanium alloy oil well pipe is urgently needed
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the preparation method of the titanium alloy oil well pipe, which has the advantages of long service life, strong pressure resistance and corrosion resistance, capability of effectively adapting to various severe environments and the like, and solves the problems of short service life, poor pressure resistance and corrosion resistance and incapability of effectively adapting to various severe environments.
(II) technical scheme
In order to achieve the purposes of long service life, strong pressure resistance and corrosion resistance, capability of effectively adapting to various severe environments and the like, the invention provides the following technical scheme: the preparation method of the titanium alloy oil well pipe is characterized by comprising the following steps of:
s1, selecting and preparing materials
Selecting a titanium alloy blank with the diameter being more than 20cm of the required oil pipe, cutting the selected blank into a titanium alloy blank rod with the length being more than 5m of the required oil pipe through a cutting machine, clamping the selected titanium alloy blank rod and placing the titanium alloy blank rod on a lathe, firstly, turning the surface of the titanium alloy blank rod by 1-2 mm through a turning tool of the lathe, turning two end faces of the titanium alloy blank rod by 1-2 mm through turning tools, and finally obtaining the titanium alloy blank rod.
S2, processing outer wall
Placing the titanium alloy rough blank rod obtained in the step S1 on a grinding machine, grinding the titanium alloy rough blank rod by aligning the grinding wheel of the grinding machine with the surface until the precision is 20cm of the diameter of the required oil pipe, and the allowable vertical error is +/-2 mm; and (4) clamping the two ends of the titanium alloy rod again, placing the titanium alloy rod on a lathe, and turning the required threads by using a lathe tool to obtain the titanium alloy rod to be processed.
S3 boring
Placing the titanium alloy rod obtained through the S2 fine machining on a lathe, drilling a hole with the diameter of 2-3 cm in the middle of one end face of the titanium alloy rod through a drill bit, placing the titanium alloy rod with the drilled hole on a boring machine for clamping, aligning one end face with the drilled hole to a boring cutter, boring a through hole with the diameter of 18cm in the middle of the titanium alloy rod with the boring cutter taking the drilled hole with the diameter of 2-3 cm as the center, and enabling the vertical error of the through hole to be +/-3 mm to obtain the titanium alloy oil well pipe.
S4 finishing
Coating a layer of wax on the outer wall and the inner wall of the titanium alloy oil well pipe obtained in the step S3, uniformly polishing the wax on the pipe wall of the titanium alloy oil well pipe through a polisher, then burning the surface of the titanium alloy oil well pipe subjected to wax polishing through a flame spray gun at the temperature of 200-300 ℃, and finely polishing the surface of the titanium alloy oil well pipe subjected to burning through the polisher to obtain a through hole with the pipe diameter of 18cm of the titanium alloy oil well pipe, wherein the vertical error of the through hole is +/-3 mm.
S5, corrosion-resistant processing
And (3) uniformly spraying corrosion-resistant paint on the surface of the obtained titanium alloy oil well pipe through a spray gun.
Preferably, the precision processing in the steps S1, S2, S3 and S4 is followed by measurement using a vernier caliper, and the measurement error is within a range of ± 0.5 mm.
Preferably, after the step S4, the obtained titanium alloy oil well pipe is placed on a lathe, and both ends of the titanium alloy oil well pipe are machined so that the length of the titanium alloy oil well pipe is 5m and the allowable vertical error is ± 2 cm.
Preferably, the raw materials of the corrosion-resistant paint in the step S5 are as follows: 10-20 parts of basic magnesium carbonate, 5-10 parts of titanium dioxide, 20-30 parts of iron yellow, 15-25 parts of a modifier, 4-8 parts of a plasticizer and 30-40 parts of distilled water.
Preferably, 10-20 parts of basic magnesium carbonate, 5-10 parts of titanium dioxide, 20-30 parts of iron yellow, 15-25 parts of modifier and 4-8 parts of plasticizer are placed in a grinding machine and ground by grinding beads of 200-300 meshes.
Preferably, 30-40 parts of distilled water is heated to be boiled, the distilled water is introduced into a stirrer, a stirring shaft is rotated at 1500-2000 r/min, 10-20 parts of basic magnesium carbonate, 5-10 parts of titanium dioxide, 20-30 parts of iron oxide yellow and 15-25 parts of modifier are sequentially poured, and the mixture is stirred for 1-2 hours to obtain the corrosion-resistant paint.
Preferably, the corrosion-resistant paint is poured into a cooling pool to be cooled for 2-4 hours, and finally stirred for 30-40 min through a stirring rod.
(III) advantageous effects
Compared with the prior art, the invention provides a preparation method of a titanium alloy oil well pipe, which has the following beneficial effects:
1. the preparation method of the titanium alloy oil well pipe is prepared from the titanium alloy, can work in humid atmosphere and seawater medium according to the titanium alloy, and has corrosion resistance far superior to that of stainless steel; the resistance to pitting corrosion, acid corrosion and stress corrosion is particularly strong; the oil well pipe has the characteristics of excellent corrosion resistance to alkali, chloride, chlorine organic matters, nitric acid, sulfuric acid and the like, and can effectively solve the problems that the traditional oil well pipe is short in service life, poor in pressure resistance and corrosion resistance and incapable of effectively adapting to various severe environments.
2. According to the preparation method of the titanium alloy oil well pipe, the corrosion paint is coated on the outer surface of the titanium alloy oil well pipe, so that the problem that the titanium alloy material is poor in corrosion resistance to reducing oxygen and chromium salt media can be effectively solved, the corrosion resistance of the titanium alloy oil well pipe caused by different element media in seawater can be further adapted, the corrosion resistance of the oil well pipe is further enhanced, and the oil well pipe can be effectively adapted to various severe environments.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
a preparation method of a titanium alloy oil well pipe comprises the following steps:
s1, selecting and preparing materials
Selecting a titanium alloy blank with the diameter being more than 20cm of the required oil pipe, cutting the selected blank into a titanium alloy blank rod with the length being more than 5m of the required oil pipe through a cutting machine, clamping the selected titanium alloy blank rod on a lathe, firstly, turning the surface of the titanium alloy blank rod by 1mm through a turning tool of the lathe, turning two end faces of the titanium alloy blank rod by 1mm through a turning tool, and finally obtaining the titanium alloy rough blank rod.
S2, processing outer wall
Placing the titanium alloy rough blank rod obtained in the step S1 on a grinding machine, grinding the titanium alloy rough blank rod by aligning the grinding wheel of the grinding machine with the surface until the precision is 20cm of the diameter of the required oil pipe, and the allowable vertical error is +/-2 mm; and (4) clamping the two ends of the titanium alloy rod again, placing the titanium alloy rod on a lathe, and turning the required threads by using a lathe tool to obtain the titanium alloy rod to be processed.
S3 boring
Placing the titanium alloy rod obtained through the finish machining in the S2 on a lathe, drilling a hole with the diameter of 2cm in the middle of one end face of the titanium alloy rod obtained through the finish machining in the S2, placing the titanium alloy rod with the drilled hole on a boring machine for clamping, aligning one end face with the drilled hole with a boring cutter, boring a through hole with the diameter of 18cm in the middle of the titanium alloy rod with the drilled hole with the diameter of 2cm as the center through the boring cutter, and obtaining the titanium alloy oil well pipe, wherein the up-down error of the through hole is +/-3 mm.
S4 finishing
Coating a layer of wax on the outer wall and the inner wall of the titanium alloy oil well pipe obtained in the step S3, uniformly polishing the wax on the pipe wall of the titanium alloy oil well pipe through a polisher, then burning the surface of the titanium alloy oil well pipe subjected to wax polishing through a flame spray gun at the temperature of 200 ℃, finely polishing the surface of the titanium alloy oil well pipe subjected to burning through the polisher to obtain a through hole with the pipe diameter of the titanium alloy oil well pipe being 18cm, wherein the vertical error of the through hole is +/-3 mm, placing the obtained titanium alloy oil well pipe on a lathe, and processing the two ends of the titanium alloy oil well pipe to enable the length of the titanium alloy oil well pipe to be 5m and the allowable vertical error to be +/-2 cm. The titanium alloy is made of titanium alloy, can work in humid atmosphere and seawater medium according to the titanium alloy, and has corrosion resistance far superior to that of stainless steel; the resistance to pitting corrosion, acid corrosion and stress corrosion is particularly strong; the oil well pipe has the characteristics of excellent corrosion resistance to alkali, chloride, chlorine organic matters, nitric acid, sulfuric acid and the like, and can effectively solve the problems that the traditional oil well pipe is short in service life, poor in pressure resistance and corrosion resistance and incapable of effectively adapting to various severe environments.
S5, corrosion-resistant processing
Uniformly spraying corrosion-resistant paint on the surface of the obtained titanium alloy oil well pipe by a spray gun, wherein the corrosion-resistant paint comprises the following raw materials: 10 parts of basic magnesium carbonate, 5 parts of titanium dioxide, 20 parts of ferrite yellow, 15 parts of modifier, 4 parts of plasticizer and 30 parts of distilled water, wherein 10 parts of basic magnesium carbonate, 5 parts of titanium dioxide, 20 parts of ferrite yellow, 15 parts of modifier and 4 parts of plasticizer are put into a grinder to be ground by 200-mesh grinding beads, then 30 parts of distilled water is heated to be boiled, a stirring shaft is led into a stirrer to rotate at 1500r/min, 10 parts of basic magnesium carbonate, 5 parts of titanium dioxide, 20 parts of ferrite yellow and 15 parts of modifier are sequentially poured, mixed and stirred for 1h to obtain corrosion-resistant paint, then the corrosion-resistant paint is poured into a cooling pool to be cooled for 2h, finally the corrosion-resistant paint is obtained by stirring for 30min through a stirring rod, the problem that the oil-resistant performance of a titanium alloy material on reducing oxygen and chromium salt media is poor can be effectively solved by coating the corrosion-resistant paint on the outer surface of a titanium alloy well pipe on the oil well pipe, and the corrosion of the titanium alloy oil by different element media in, further enhances the corrosion resistance of the oil well pipe and can effectively adapt to various severe environments.
Wherein: after the precision machining in steps S1, S2, S3, and S4, the measurement is performed using a vernier caliper, and the measurement error allowable range is ± 0.5 mm.
Example two:
a preparation method of a titanium alloy oil well pipe comprises the following steps:
s1, selecting and preparing materials
Selecting a titanium alloy blank with the diameter being more than 20cm of the required oil pipe, cutting the selected blank into a titanium alloy blank rod with the length being more than 5m of the required oil pipe through a cutting machine, clamping the selected titanium alloy blank rod on a lathe, firstly, turning off 2mm of the surface of the titanium alloy blank rod through a turning tool of the lathe, turning off 2mm of two end faces of the titanium alloy blank rod through turning tools, and finally obtaining the titanium alloy rough blank rod.
S2, processing outer wall
Placing the titanium alloy rough blank rod obtained in the step S1 on a grinding machine, grinding the titanium alloy rough blank rod by aligning the grinding wheel of the grinding machine with the surface until the precision is 20cm of the diameter of the required oil pipe, and the allowable vertical error is +/-2 mm; and (4) clamping the two ends of the titanium alloy rod again, placing the titanium alloy rod on a lathe, and turning the required threads by using a lathe tool to obtain the titanium alloy rod to be processed.
S3 boring
Placing the titanium alloy rod obtained through the finish machining in the S2 on a lathe, drilling a hole with the diameter of 3cm in the middle of one end face of the titanium alloy rod obtained through the finish machining in the S2, placing the titanium alloy rod with the drilled hole on a boring machine for clamping, aligning one end face with the drilled hole to a boring cutter, boring a through hole with the diameter of 18cm in the middle of the titanium alloy rod with the boring cutter taking the drilled hole with the diameter of 3cm as the center, and obtaining the titanium alloy oil well pipe, wherein the up-down error of the through hole is +/-3 mm.
S4 finishing
Coating a layer of wax on the outer wall and the inner wall of the titanium alloy oil well pipe obtained in the step S3, uniformly polishing the wax on the pipe wall of the titanium alloy oil well pipe through a polisher, then burning the surface of the titanium alloy oil well pipe subjected to wax polishing through a flame spray gun at 300 ℃, finely polishing the surface of the titanium alloy oil well pipe subjected to burning through the polisher to obtain a through hole with the pipe diameter of the titanium alloy oil well pipe being 18cm, wherein the vertical error of the through hole is +/-3 mm, placing the obtained titanium alloy oil well pipe on a lathe, and processing the two ends of the titanium alloy oil well pipe to enable the length of the titanium alloy oil well pipe to be 5m and the allowable vertical error to be +/-2 cm. The titanium alloy is made of titanium alloy, can work in humid atmosphere and seawater medium according to the titanium alloy, and has corrosion resistance far superior to that of stainless steel; the resistance to pitting corrosion, acid corrosion and stress corrosion is particularly strong; the oil well pipe has the characteristics of excellent corrosion resistance to alkali, chloride, chlorine organic matters, nitric acid, sulfuric acid and the like, and can effectively solve the problems that the traditional oil well pipe is short in service life, poor in pressure resistance and corrosion resistance and incapable of effectively adapting to various severe environments.
S5, corrosion-resistant processing
Uniformly spraying corrosion-resistant paint on the surface of the obtained titanium alloy oil well pipe by a spray gun, wherein the corrosion-resistant paint comprises the following raw materials: 20 parts of basic magnesium carbonate, 10 parts of titanium dioxide, 30 parts of iron yellow, 25 parts of modifier, 8 parts of plasticizer and 40 parts of distilled water, wherein 20 parts of basic magnesium carbonate, 10 parts of titanium dioxide, 30 parts of iron yellow, 25 parts of modifier and 8 parts of plasticizer are put into a grinder to be ground by grinding beads with 300 meshes, then 40 parts of distilled water is heated to be boiled, the mixer shaft is led into a mixer to rotate at 2000r/min, 20 parts of basic magnesium carbonate, 10 parts of titanium dioxide, 30 parts of iron yellow and 25 parts of modifier are sequentially poured, the mixture is stirred for 2 hours to obtain corrosion-resistant paint, then the corrosion-resistant paint is poured into a cooling pool to be cooled for 4 hours, finally the corrosion-resistant paint is obtained by stirring a stirring rod for 40 minutes, the problem that the oil-resistant performance of a titanium alloy material on reducing oxygen and chromium salt media is poor can be effectively solved by coating the corrosion-resistant paint on the outer surface of a titanium alloy well pipe on the oil well pipe, and the corrosion of the titanium alloy oil by different element media in, further enhances the corrosion resistance of the oil well pipe and can effectively adapt to various severe environments.
Wherein: after the precision machining in steps S1, S2, S3, and S4, the measurement was performed using a vernier caliper, and the measurement error allowable range was ± 0.5 mm.
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 (7)
1. The preparation method of the titanium alloy oil well pipe is characterized by comprising the following steps of:
s1, selecting and preparing materials
Selecting a titanium alloy blank with the diameter being more than 20cm of the required oil pipe, cutting the selected blank into a titanium alloy blank rod with the length being more than 5m of the required oil pipe through a cutting machine, clamping the selected titanium alloy blank rod and placing the titanium alloy blank rod on a lathe, firstly, turning the surface of the titanium alloy blank rod by 1-2 mm through a turning tool of the lathe, turning two end faces of the titanium alloy blank rod by 1-2 mm through turning tools, and finally obtaining the titanium alloy blank rod.
S2, processing outer wall
Placing the titanium alloy rough blank rod obtained in the step S1 on a grinding machine, grinding the titanium alloy rough blank rod by aligning the grinding wheel of the grinding machine with the surface until the precision is 20cm of the diameter of the required oil pipe, and the allowable vertical error is +/-2 mm; and (4) clamping the two ends of the titanium alloy rod again, placing the titanium alloy rod on a lathe, and turning the required threads by using a lathe tool to obtain the titanium alloy rod to be processed.
S3 boring
Placing the titanium alloy rod obtained through the S2 fine machining on a lathe, drilling a hole with the diameter of 2-3 cm in the middle of one end face of the titanium alloy rod through a drill bit, placing the titanium alloy rod with the drilled hole on a boring machine for clamping, aligning one end face with the drilled hole to a boring cutter, boring a through hole with the diameter of 18cm in the middle of the titanium alloy rod with the boring cutter taking the drilled hole with the diameter of 2-3 cm as the center, and enabling the vertical error of the through hole to be +/-3 mm to obtain the titanium alloy oil well pipe.
S4 finishing
Coating a layer of wax on the outer wall and the inner wall of the titanium alloy oil well pipe obtained in the step S3, uniformly polishing the wax on the pipe wall of the titanium alloy oil well pipe through a polisher, then burning the surface of the titanium alloy oil well pipe subjected to wax polishing through a flame spray gun at the temperature of 200-300 ℃, and finely polishing the surface of the titanium alloy oil well pipe subjected to burning through the polisher to obtain a through hole with the pipe diameter of 18cm of the titanium alloy oil well pipe, wherein the vertical error of the through hole is +/-3 mm.
S5, corrosion-resistant processing
And (3) uniformly spraying corrosion-resistant paint on the surface of the obtained titanium alloy oil well pipe through a spray gun.
2. The method for preparing a titanium alloy oil well pipe according to claim 1, wherein the precision machining in the steps S1, S2, S3 and S4 is followed by measurement by a vernier caliper, and the allowable range of measurement error is ± 0.5 mm.
3. The method for manufacturing the titanium alloy oil well pipe according to claim 1, wherein after the step S4, the obtained titanium alloy oil well pipe is placed on a lathe, and both ends of the titanium alloy oil well pipe are machined so that the length of the titanium alloy oil well pipe is 5m and the allowable vertical error is ± 2 cm.
4. The method for preparing the titanium alloy oil well pipe according to claim 1, wherein the raw materials of the corrosion-resistant paint in the step S5 are as follows: 10-20 parts of basic magnesium carbonate, 5-10 parts of titanium dioxide, 20-30 parts of iron yellow, 15-25 parts of a modifier, 4-8 parts of a plasticizer and 30-40 parts of distilled water.
5. The method for preparing the titanium alloy oil well pipe according to claim 4, wherein 10-20 parts of basic magnesium carbonate, 5-10 parts of titanium dioxide, 20-30 parts of iron yellow, 15-25 parts of modifier and 4-8 parts of plasticizer are placed in a grinding machine and ground by 200-300-mesh grinding beads.
6. The preparation method of the titanium alloy oil well pipe according to claim 5, wherein 30-40 parts of distilled water is heated to boiling, the distilled water is introduced into a stirrer to rotate a stirring shaft at 1500-2000 r/min, 10-20 parts of basic magnesium carbonate, 5-10 parts of titanium dioxide, 20-30 parts of iron oxide yellow and 15-25 parts of a modifier are sequentially poured, and the mixture is mixed and stirred for 1-2 hours to obtain the corrosion-resistant paint.
7. The method for preparing the titanium alloy oil well pipe according to claim 6, wherein the corrosion-resistant paint is poured into a cooling pool to be cooled for 2-4 hours, and finally stirred for 30-40 min by a stirring rod.
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| CN202010928080.2A CN112139764A (en) | 2020-09-07 | 2020-09-07 | Preparation method of titanium alloy oil well pipe |
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| CN202010928080.2A CN112139764A (en) | 2020-09-07 | 2020-09-07 | Preparation method of titanium alloy oil well pipe |
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| CN1109080A (en) * | 1994-03-21 | 1995-09-27 | 金强 | Water-soluble inorganic corrosionproof coating |
| CN1990178A (en) * | 2005-12-26 | 2007-07-04 | 张明亮 | Inside and outside surface treating technique of stainless steel drinking water pressure container |
| CN102553799A (en) * | 2010-12-14 | 2012-07-11 | 张家港市华杨金属制品有限公司 | Production process for improving varnishability of aluminum profile |
| CN104119740A (en) * | 2014-08-04 | 2014-10-29 | 刘刚 | Fireproof coating and preparation process thereof |
| CN106736265A (en) * | 2016-11-25 | 2017-05-31 | 鑫鹏源智能装备集团有限公司 | A kind of preparation method of titanium alloy oil well pipe |
| CN107649342A (en) * | 2017-09-19 | 2018-02-02 | 朱义芳 | The waxing method of stainless steel ferrule-type compression joint nut |
| CN108161341A (en) * | 2017-11-17 | 2018-06-15 | 宁波路通液压器材有限公司 | A kind of processing technology of two logical hydraulic fittings |
| CN111519231A (en) * | 2020-05-11 | 2020-08-11 | 中国石油天然气集团有限公司 | Surface treatment method for short section of titanium alloy oil pipe |
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2020
- 2020-09-07 CN CN202010928080.2A patent/CN112139764A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1109080A (en) * | 1994-03-21 | 1995-09-27 | 金强 | Water-soluble inorganic corrosionproof coating |
| CN1990178A (en) * | 2005-12-26 | 2007-07-04 | 张明亮 | Inside and outside surface treating technique of stainless steel drinking water pressure container |
| CN102553799A (en) * | 2010-12-14 | 2012-07-11 | 张家港市华杨金属制品有限公司 | Production process for improving varnishability of aluminum profile |
| CN104119740A (en) * | 2014-08-04 | 2014-10-29 | 刘刚 | Fireproof coating and preparation process thereof |
| CN106736265A (en) * | 2016-11-25 | 2017-05-31 | 鑫鹏源智能装备集团有限公司 | A kind of preparation method of titanium alloy oil well pipe |
| CN107649342A (en) * | 2017-09-19 | 2018-02-02 | 朱义芳 | The waxing method of stainless steel ferrule-type compression joint nut |
| CN108161341A (en) * | 2017-11-17 | 2018-06-15 | 宁波路通液压器材有限公司 | A kind of processing technology of two logical hydraulic fittings |
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Application publication date: 20201229 |