CN111014303A - Seamless treatment method for large-diameter thin-wall titanium welded pipe - Google Patents
Seamless treatment method for large-diameter thin-wall titanium welded pipe Download PDFInfo
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- CN111014303A CN111014303A CN201911299448.7A CN201911299448A CN111014303A CN 111014303 A CN111014303 A CN 111014303A CN 201911299448 A CN201911299448 A CN 201911299448A CN 111014303 A CN111014303 A CN 111014303A
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 239000010936 titanium Substances 0.000 title claims abstract description 64
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000002253 acid Substances 0.000 claims abstract description 24
- 238000005406 washing Methods 0.000 claims abstract description 21
- 238000000137 annealing Methods 0.000 claims abstract description 16
- 238000003466 welding Methods 0.000 claims abstract description 16
- 238000005097 cold rolling Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 230000009467 reduction Effects 0.000 claims abstract description 10
- 239000012300 argon atmosphere Substances 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims abstract description 6
- 230000001590 oxidative effect Effects 0.000 claims abstract description 4
- 238000004321 preservation Methods 0.000 claims description 5
- 230000007547 defect Effects 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000005554 pickling Methods 0.000 claims 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000003912 environmental pollution Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 7
- 238000009864 tensile test Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 208000032170 Congenital Abnormalities Diseases 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011534 incubation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
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Classifications
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/12—Light metals
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/04—Apparatus for cleaning or pickling metallic material for cleaning pipes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Arc Welding In General (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention provides a seamless treatment method for a large-diameter thin-wall titanium welded pipe. The method is that the titanium welded pipe is made by one or more passes of cold rolling, reducing the diameter and reducing the wall, acid washing, heat treatment and acid washing; the titanium welded pipe is a straight seam titanium welded pipe automatically produced on line, the titanium welded pipe is cold-rolled to form a titanium seamless pipe, the welding seam of the formed pipe is invisible, and the wall thickness and the outer diameter are uniform; the heat treatment is completed under the protection of argon atmosphere, and an acid washing procedure is added before the heat treatment to prevent the pipe from burning and oxidizing in an annealing furnace. The seamless titanium welded pipe produced by the invention has uniform wall thickness and outer diameter, the dimensional accuracy is superior to that of the common seamless pipe, the process route of directly eliminating the welding seam of the large-caliber thin-wall pipe is realized to replace the large-caliber thin-wall seamless pipe, the production cost is reduced, and the environmental pollution is reduced. The seamless titanium welded pipe is prepared by one or more passes of cold rolling, diameter reduction, wall reduction, acid washing, heat treatment and acid washing, and has compact metallographic structure and excellent comprehensive mechanical property.
Description
Technical Field
The invention relates to the technical field of titanium welded pipes, in particular to a seamless treatment method for a large-diameter thin-wall titanium welded pipe.
Background
The titanium tube mainly comprises a seamless tube and a welded tube. Because the thin-wall seamless tube has low yield (about 60 percent) and high manufacturing cost and has large environmental pollution, the titanium welded tube becomes a trend of tube production. Meanwhile, because the welded pipe has a welding seam, the welded joint structure of the welded pipe has certain difference, and the welded pipe also has great difference in the aspect of corrosion resistance of the pipe, so that the application of the welded pipe is limited, the titanium welded pipe cannot enter in many fields due to congenital defects and can only be used in a working condition environment with low pressure or low pressure requirement. Therefore, the seamless treatment of the welded pipe becomes a development trend, but the titanium pipe manufactured by the existing seamless treatment has poor mechanical property and can not meet the use requirement.
In view of the above, there is a need for a seamless treatment method for a large-diameter thin-wall titanium welded pipe to solve the problems in the prior art.
Disclosure of Invention
The invention aims to provide a seamless treatment method for a large-diameter thin-wall titanium welded pipe, so as to obtain the seamless titanium welded pipe with a more compact metallographic structure and more excellent comprehensive mechanical properties.
In order to achieve the aim, the invention provides a seamless treatment method for a large-diameter thin-wall titanium welded pipe, which comprises the following steps:
the method comprises the following steps: selecting and processing a titanium welded pipe, namely selecting a straight welded titanium pipe as a mother pipe, carrying out online high-frequency annealing and nondestructive inspection on a welding line of the mother pipe, and carrying out hydraulic pressure airtight test to ensure that the mother pipe is free of defects;
step two: cold rolling the reduced wall, and performing at least one cold rolling process on the mother pipe selected in the step one to reduce the diameter of the mother pipe to reduce the wall, wherein the original welding seam on the surface is invisible;
step three: acid washing, namely, carrying out acid washing on the titanium pipe obtained in the step two to remove oil, and preventing the pipe from burning and oxidizing in an annealing furnace;
step four: performing heat treatment, namely performing argon atmosphere protection annealing treatment on the titanium pipe obtained in the step three in an offline vacuum annealing furnace to obtain a seamless titanium welded pipe;
step five: acid washing, namely placing the titanium pipe obtained in the step four into an acid washing tank for acid washing to obtain a titanium pipe with a bright surface, namely a pipe subjected to final seamless treatment;
preferably, in the first step, the outer diameter of the mother pipe is 48mm to 65 mm, and the wall thickness of the mother pipe is 0.8mm to 1.2 mm.
Preferably, in the first step, the on-line annealing of the welding line of the main pipe is carried out under the protection of argon atmosphere, the temperature is controlled to be 500-550 ℃, and the heat preservation time is 120-180 min.
Preferably, in the second step, the reduction rate of each cold rolling pass is controlled to be between 4% and 15%, and the reduction rate is controlled to be between 30% and 50%.
Preferably, in the fourth step, the heat treatment temperature is controlled to be 500-550 ℃, and the furnace cooling is carried out after the heat preservation time is 2-3 hours.
The technical scheme of the invention has the following beneficial effects:
the seamless titanium welded pipe produced by the invention has uniform wall thickness and outer diameter, the dimensional accuracy is superior to that of the common seamless pipe, the process route of directly eliminating the welding seam of the large-caliber thin-wall pipe is realized to replace the large-caliber thin-wall seamless pipe, the production cost is reduced, and the environmental pollution is reduced. The seamless titanium welded pipe is prepared by one or more passes of cold rolling, diameter reduction, wall reduction, acid washing, heat treatment and acid washing, and has compact metallographic structure and excellent comprehensive mechanical property.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a comparison of the structure of a welded pipe before and after a seamless treatment;
FIG. 2 is a metallographic structure diagram of a base material of a conventional TA1 welded pipe;
FIG. 3 is a metallographic structure diagram of a weld of a conventional TA1 welded pipe;
FIG. 4 is a metallographic structure diagram of a heat affected zone of a conventional TA1 welded pipe;
FIG. 5 is a metallographic structure diagram of base metal after seamless treatment of a TA1 welded pipe;
FIG. 6 is a metallographic structure diagram of a weld joint of a TA1 welded pipe after seamless treatment;
FIG. 7 is a metallographic structure diagram of a heat affected zone of a TA1 welded pipe after seamless treatment;
Detailed Description
Embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.
Example 1:
referring to fig. 1 to 7, a seamless treatment method for a large-diameter thin-wall titanium welded pipe comprises the following steps:
the method comprises the following steps: selecting and processing a titanium welded pipe, namely selecting a straight welded titanium pipe as a mother pipe, carrying out online high-frequency annealing and nondestructive inspection on a welding line of the mother pipe, and carrying out hydraulic pressure airtight test to ensure that the mother pipe is free of defects;
the outer diameter of the mother pipe is 48 mm-65 mm, and the wall thickness is 0.8 mm-1.2 mm. In the embodiment, the parent tube is a TA 1-grade straight seam welding titanium tube with the outer diameter of 55 mm, the wall thickness of 1.0 mm and the length of 2000 mm.
And carrying out on-line annealing on the welding line of the main pipe under the protection of argon atmosphere, controlling the temperature to be 500-550 ℃, and keeping the temperature for 120-180 min. The temperature in this example was 520 ℃ and the holding time was 120 minutes.
Step two: cold rolling the reduced wall, and performing at least one cold rolling process on the mother pipe selected in the step one to reduce the diameter of the mother pipe to reduce the wall, wherein the original welding seam on the surface is invisible; the cold rolling reducing rate of each pass is controlled to be between 4% and 15%, and the wall reducing rate is controlled to be between 30% and 50%.
In this embodiment, the seamless titanium welded pipe is obtained through one-pass cold rolling, in which a core rod with an outer diameter of 49.8 mm and a mold with an outer diameter of 50.8 mm are adopted, and the seamless titanium welded pipe is obtained through the cold rolling, wherein the outer diameter of the seamless titanium welded pipe is 50.8 mm, the wall thickness of the seamless titanium welded pipe is 0.5 mm, and the length of the seamless titanium welded pipe is 2700 mm.
Step three: acid washing, namely, carrying out acid washing on the titanium pipe obtained in the step two to remove oil, and preventing the pipe from burning and oxidizing in an annealing furnace;
step four: performing heat treatment, namely performing argon atmosphere protection annealing treatment on the titanium pipe obtained in the step three in an offline vacuum annealing furnace to obtain a seamless titanium welded pipe; controlling the heat treatment temperature at 500-550 ℃, keeping the temperature for 2-3 hours, and then cooling along with the furnace. The temperature in this example was 520 ℃ and the incubation time was 120 minutes.
Step five: acid washing, namely placing the titanium pipe obtained in the step four into an acid washing tank for acid washing to obtain a titanium pipe with a bright surface, namely a pipe subjected to final seamless treatment; the acid-washed pipe can be observed whether micro cracks or surface defects exist, and finally, nondestructive testing at the later stage is facilitated.
As can be seen from the comparison of the metallographic structure diagrams of the prior TA1 welded pipe and the seamless titanium pipe produced by the method of the invention in the figures 2-7, the seamless titanium welded pipe produced by the method of the invention has uniform wall thickness and outer diameter, and has better dimensional accuracy than the common seamless pipe, realizes the replacement of the large-caliber thin-wall seamless pipe by the process route of directly eliminating the welding seam of the large-caliber thin-wall pipe, reduces the production cost and reduces the environmental pollution. The seamless titanium welded pipe is prepared by one-pass cold rolling, diameter reduction, wall reduction, acid washing, heat treatment and acid washing, and the metallographic structure of the seamless titanium welded pipe is more compact.
The original titanium pipe (mother pipe) and the titanium pipe (heat treatment temperature 520 ℃, heat preservation time two hours) after the seamless treatment are subjected to tensile test, and the test results are shown in the table I and the table II, wherein R in the tablemDenotes tensile strength, Rp0.2Denotes the yield strength, A50 represents elongation. The parameter values in the first table and the second table are compared, so that the yield strength of the titanium pipe after seamless treatment is greatly reduced, the yield strength is reduced, the cold-working forming performance and the welding performance can be improved, and the use requirements of the titanium pipe in more fields can be met; the parameters such as tensile strength, elongation, weld hardness and the like are not changed greatly, and the change difference value floats within the range of 1-3. Therefore, the titanium tube treated by the method in a seamless manner has better comprehensive mechanical property.
Table one: tensile test results of the mother tube
Table two: tensile test result of titanium tube after seamless treatment
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A seamless treatment method for a large-diameter thin-wall titanium welded pipe is characterized by comprising the following steps:
the method comprises the following steps: selecting and processing a titanium welded pipe, namely selecting a straight welded titanium pipe as a mother pipe, carrying out online high-frequency annealing and nondestructive inspection on a welding line of the mother pipe, and carrying out hydraulic pressure airtight test to ensure that the mother pipe is free of defects;
step two: cold rolling the reduced wall, and performing at least one cold rolling process on the mother pipe selected in the step one to reduce the diameter of the mother pipe to reduce the wall, wherein the original welding seam on the surface is invisible;
step three: acid washing, namely, carrying out acid washing on the titanium pipe obtained in the step two to remove oil, and preventing the pipe from burning and oxidizing in an annealing furnace;
step four: performing heat treatment, namely performing argon atmosphere protection annealing treatment on the titanium pipe obtained in the step three in an offline vacuum annealing furnace to obtain a seamless titanium welded pipe;
step five: and (4) acid pickling, namely putting the titanium pipe obtained in the step four into an acid pickling tank for acid pickling to obtain the titanium pipe with a bright surface, namely the pipe subjected to final seamless treatment.
2. The method according to claim 1, wherein in the first step, the outer diameter of the mother pipe is 48mm to 65 mm, and the wall thickness is 0.8mm to 1.2 mm.
3. The seamless treatment method for the large-diameter thin-wall titanium welded pipe according to claim 1, characterized in that in the first step, the on-line annealing of the welding seam of the mother pipe is carried out under the protection of argon atmosphere, the temperature is controlled to be 500-550 ℃, and the heat preservation time is 120-180 min.
4. The large-diameter thin-wall titanium welded pipe seamless treatment method according to claim 1, wherein in the second step, the reduction rate of cold rolling in each pass is controlled to be between 4% and 15%, and the reduction rate of the wall is controlled to be between 30% and 50%.
5. The seamless treatment method for the large-diameter thin-wall titanium welded pipe according to claim 1, characterized in that in the fourth step, the heat treatment temperature is controlled to be 500-550 ℃, the heat preservation time is 2-3 hours, and then the welded pipe is cooled along with the furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911299448.7A CN111014303A (en) | 2019-12-17 | 2019-12-17 | Seamless treatment method for large-diameter thin-wall titanium welded pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911299448.7A CN111014303A (en) | 2019-12-17 | 2019-12-17 | Seamless treatment method for large-diameter thin-wall titanium welded pipe |
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| CN201911299448.7A Pending CN111014303A (en) | 2019-12-17 | 2019-12-17 | Seamless treatment method for large-diameter thin-wall titanium welded pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114289544A (en) * | 2021-12-31 | 2022-04-08 | 武汉市博钛新材料科技有限公司 | Rapid reducing production device and process for high-frequency induction titanium welded pipe |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114289544A (en) * | 2021-12-31 | 2022-04-08 | 武汉市博钛新材料科技有限公司 | Rapid reducing production device and process for high-frequency induction titanium welded pipe |
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Application publication date: 20200417 |