CN115821189B - Heat treatment method of titanium strip coil for plate replacement - Google Patents
Heat treatment method of titanium strip coil for plate replacement Download PDFInfo
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- CN115821189B CN115821189B CN202310132692.4A CN202310132692A CN115821189B CN 115821189 B CN115821189 B CN 115821189B CN 202310132692 A CN202310132692 A CN 202310132692A CN 115821189 B CN115821189 B CN 115821189B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention provides a heat treatment method of a titanium strip coil for plate replacement, which comprises the following steps: step one, conveying a plate subjected to cold rolling and cleaning by a degreasing process to a hood-type annealing furnace or a vacuum furnace by using a titanium strip coil, vacuumizing to a vacuum degree of 40-70Pa, backfilling high-purity argon, vacuumizing to a vacuum degree of 40-70Pa, and backfilling high-purity argon; step two, heating the titanium strip coil treated in the step one to 450-500 ℃, and preserving heat for 6-10 hours after the titanium strip coil is heated; step three, cooling the titanium strip coil treated in the step two to the furnace temperature of 200 ℃ of a hood-type annealing furnace or a vacuum furnace, and stopping cooling; step four, heating the titanium strip coil treated in the step three to 600-700 ℃, preserving heat for 6-10 hours, cooling to 60 ℃ of the furnace temperature of a hood-type annealing furnace or a vacuum furnace, and discharging; the heat treatment method is simple and easy to implement, and meanwhile, the uniformity and the performance stability of the coil grains are effectively improved, and the improvement of the IE value of the finished product is promoted.
Description
Technical Field
The invention relates to the technical field of metal material processing, in particular to a heat treatment method of a titanium strip coil for plate replacement.
Background
The titanium plate type heat exchanger is widely applied to industrial departments such as chemical industry, petroleum, metallurgy, electric power, ships and the like, has large application amount, is used as a common heat treatment method for cold rolling pure titanium coils for plate exchange by vacuum annealing, and has a heat transfer mode mainly carried out by heat radiation, has lower heat transfer efficiency, and hardly ensures the performance uniformity of different parts of the titanium coil.
Secondly, the common heat treatment method of the cold-rolled pure titanium coil for plate replacement has the defects of non-uniformity of coil grains, instability in the use process of the titanium coil, low IE value of a finished product and subsequent use cracking.
Disclosure of Invention
The invention aims to solve the technical problem of providing a heat treatment method of a titanium strip coil for plate replacement.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the heat treatment method of the titanium strip coil for plate replacement comprises the following steps:
firstly, conveying a plate which is subjected to cold rolling and cleaning by a degreasing process to a hood-type annealing furnace or a vacuum furnace by using a titanium strip coil, vacuumizing to a vacuum degree of 40-70Pa, backfilling high-purity argon, vacuumizing again to a vacuum degree of 40-70Pa, and backfilling high-purity argon;
step two, heating the titanium strip coil treated in the step one to 450-500 ℃, and preserving heat for 6-10 hours after the titanium strip coil is heated;
step three, cooling the titanium strip coil treated in the step two to the furnace temperature of 200 ℃ of a hood-type annealing furnace or a vacuum furnace, and stopping cooling;
and fourthly, heating the titanium strip coil treated in the third step to 600-700 ℃, preserving heat for 6-10h, cooling to the furnace temperature of 60 ℃ of a hood-type annealing furnace or a vacuum furnace, and discharging.
Further, in the first step, high-purity argon is backfilled to the air pressure of 100-120 kPa.
Further, in the second step, the temperature of the titanium strip coil is increased to 450-500 ℃ at a temperature increasing speed of 20-50 ℃/h.
Further, in the third step, the titanium strip coil is cooled to the furnace temperature of 200 ℃ of the hood-type annealing furnace or the vacuum furnace at the cooling speed higher than 15 ℃/h.
In the fourth step, the temperature is reduced to 60 ℃ through argon filling, and the furnace is discharged from the hood-type annealing furnace.
In the fourth step, the temperature is reduced to 60 ℃ through argon filling, and the furnace is taken out.
Compared with the prior art, the invention has the following beneficial effects:
the heat treatment method of the titanium strip coil for plate replacement is simple and easy to implement, can be realized in the original coil annealing furnace, and simultaneously effectively improves the uniformity and performance stability of the strip coil crystal grains and promotes the improvement of the IE value of the finished product.
Drawings
FIG. 1 is a schematic diagram of the grain structure of a coil under cap annealing according to example 1 of the present invention;
FIG. 2 is a schematic view showing the grain structure of a coil under vacuum annealing according to example 2 of the present invention;
FIG. 3 is a schematic view of the grain structure of a coil under vacuum annealing in a conventional heat treatment in comparative example 1;
fig. 4 is a schematic diagram of the coil grain structure under the hood-type annealing in the conventional heat treatment of comparative example 2.
Detailed Description
The invention is further described below with reference to the drawings and examples.
Example 1
The embodiment comprises the following steps:
firstly, conveying a plate which is subjected to cold rolling and cleaning by a degreasing process to a hood-type annealing furnace by using a titanium strip coil, vacuumizing to a vacuum degree of 50Pa, backfilling high-purity argon, vacuumizing again to a vacuum degree of 50Pa, and backfilling high-purity argon; in this example, the pressure of the backfilled high purity argon is 110kPa;
step two, heating the titanium strip coil treated in the step one to 470 ℃ at a heating rate of 40 ℃/h, and preserving heat for 7h after heating;
step three, cooling the titanium strip coil treated in the step two to the furnace temperature of 200 ℃ of the hood-type annealing furnace at a cooling speed higher than 15 ℃/h, and stopping cooling;
step four, heating the titanium strip coil treated in the step three to 700 ℃, preserving heat for 7 hours, cooling to the furnace temperature of the hood-type annealing furnace, and discharging from the furnace at 60 ℃; in the embodiment, argon is filled in the hood-type annealing furnace, the temperature is reduced to 60 ℃ of the furnace temperature of the hood-type annealing furnace, and the furnace is discharged; the coil grains of the obtained titanium coil are shown in fig. 1; and compared with fig. 3, the grain size of the titanium tape roll of the embodiment is more uniform, and meanwhile, the IE value of the application is improved by 12.1.
Example 2
The embodiment comprises the following steps:
firstly, conveying a plate which is subjected to cold rolling and cleaning by a degreasing process into a vacuum furnace by using a titanium strip coil, vacuumizing to a vacuum degree of 60Pa, backfilling high-purity argon, vacuumizing again to a vacuum degree of 60Pa, and backfilling high-purity argon; in this example, the pressure of the backfilled high purity argon was 120kPa;
step two, heating the titanium strip coil treated in the step one to 500 ℃ at a heating rate of 50 ℃/h, and preserving heat for 9h after heating;
step three, cooling the titanium strip coil treated in the step two to the furnace temperature of 200 ℃ of the vacuum furnace at a cooling speed higher than 15 ℃/h, and stopping cooling;
step four, heating the titanium strip coil treated in the step three to 700 ℃, preserving heat for 9 hours, cooling to the furnace temperature of a vacuum furnace, and discharging from the furnace at 60 ℃; in the embodiment, argon is filled in a vacuum furnace, the temperature is reduced to 60 ℃ of the furnace temperature of the vacuum furnace, and the furnace is discharged; the coil grains of the obtained titanium coil are shown in fig. 1; and compared with fig. 4, the grain size of the titanium tape roll of the embodiment is more uniform, and meanwhile, the IE value of the application is improved by 12.4.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the technical solution of the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solution described in the foregoing embodiments may be modified or some of the technical features thereof may be equally substituted; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. A heat treatment method of a titanium strip coil for plate replacement is characterized by comprising the following steps: the method comprises the following steps:
step one, conveying a plate which is subjected to cold rolling and cleaning by a degreasing process to a hood-type annealing furnace or a vacuum furnace by using a titanium strip coil, vacuumizing to a vacuum degree of 40-70Pa, backfilling high-purity argon, vacuumizing again to a vacuum degree of 40-70Pa, and backfilling high-purity argon;
step two, heating the titanium strip coil treated in the step one to 450-500 ℃ at a heating rate of 20-50 ℃/h, and preserving heat for 6-10h after heating;
step three, cooling the titanium strip coil treated in the step two to the furnace temperature of 200 ℃ of a hood-type annealing furnace or a vacuum furnace at a cooling speed higher than 15 ℃/h, and stopping cooling;
and fourthly, heating the titanium strip coil treated in the third step to 600-700 ℃, preserving heat for 6-10h, cooling to the furnace temperature of 60 ℃ of a hood-type annealing furnace or a vacuum furnace, and discharging.
2. The heat treatment method of the plate-replacing titanium strip coil according to claim 1, wherein: in the first step, the air pressure of the backfilled high-purity argon is 100-120 kPa.
3. The heat treatment method of the plate-replacing titanium strip coil according to claim 2, wherein: in the fourth step, the temperature is reduced to 60 ℃ through argon filling and discharging is carried out.
4. A heat treatment method of a plate-replacing titanium strip coil according to claim 3, wherein: in the fourth step, the temperature is reduced to 60 ℃ through argon filling, and the furnace is taken out.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310132692.4A CN115821189B (en) | 2023-02-20 | 2023-02-20 | Heat treatment method of titanium strip coil for plate replacement |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310132692.4A CN115821189B (en) | 2023-02-20 | 2023-02-20 | Heat treatment method of titanium strip coil for plate replacement |
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| CN115821189A CN115821189A (en) | 2023-03-21 |
| CN115821189B true CN115821189B (en) | 2023-05-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09217157A (en) * | 1996-02-09 | 1997-08-19 | Nippon Steel Corp | Method for annealing titanium thin cold rolled coil |
| CN106636747B (en) * | 2016-12-29 | 2018-06-05 | 广东技术师范学院 | A kind of manufacturing method using heavy and medium plate mill double annealing production technical pure titanium plate |
| CN110923597A (en) * | 2019-12-03 | 2020-03-27 | 西安庄信新材料科技有限公司 | Vacuum annealing treatment process for titanium strip coil |
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