CN112756909A - Preparation method of large-caliber Ti35 titanium alloy pipe - Google Patents
Preparation method of large-caliber Ti35 titanium alloy pipe Download PDFInfo
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- CN112756909A CN112756909A CN202011550180.2A CN202011550180A CN112756909A CN 112756909 A CN112756909 A CN 112756909A CN 202011550180 A CN202011550180 A CN 202011550180A CN 112756909 A CN112756909 A CN 112756909A
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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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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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- 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
- C21D2261/00—Machining or cutting being involved
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Abstract
The invention discloses a preparation method of a large-caliber Ti35 titanium alloy pipe, wherein the Ti35 titanium alloy pipe comprises the following components in percentage by mass: 5.5 to 6.5 percent of Ta, less than or equal to 0.15 percent of Fe, less than or equal to 0.08 percent of C, less than or equal to 0.03 percent of N, less than or equal to 0.010 percent of H, 0.08 to 0.12 percent of O, and the balance of titanium and inevitable impurities; the preparation method comprises the following specific processes: the method comprises the steps of cogging and forging a Ti35 titanium alloy ingot to obtain a forged blank, carrying out high-temperature homogenization treatment, carrying out multi-fire forging to obtain a bar blank, carrying out surface machining and flaw detection to obtain a bar, machining the bar into a tube blank by using a material taking machine, annealing the tube blank, and then machining. According to the invention, through high-temperature homogenization treatment, the uniformity of micro-area components is improved, the processing property and the corrosion property of the alloy are improved, the production of small-batch multi-specification large-caliber Ti35 titanium alloy seamless pipes is realized, and the method is widely applied to the manufacturing of equipment such as nuclear energy equipment and petrochemical equipment.
Description
Technical Field
The invention belongs to the technical field of titanium alloy material processing, and particularly relates to a preparation method of a large-caliber Ti35 titanium alloy pipe.
Background
The Ti35 titanium alloy has the advantages of small density, high specific strength, excellent welding performance and the like, and has the greatest characteristic of excellent nitric acid corrosion resistance, the corrosion rate of 0.1mm/a in boiling 8mol nitric acid solution and wide application prospect in a nitric acid environment, particularly in a boiling concentrated nitric acid environment.
The Ti35 titanium alloy contains Ta element with high specific gravity and high melting point, and the inevitable microscopic segregation exists in the cast ingot, which influences the comprehensive performance of the Ti35 titanium alloy to a certain extent. The existing preparation methods of the large-caliber Ti35 titanium alloy pipe comprise three types, one type is that a plate is pressed and formed by a plate bending machine or an oil press, then the plate is welded into a circular pipe, and the circular pipe is made into a welded pipe with a seam through rounding and straightening; another type is a seamless tube made by piercing or extruding a rod to form a tube blank, and then hot rolling or cold rolling. Because the welded pipe has a welding seam, certain potential safety hazard exists, the rolled seamless pipe has long process, and the small-batch large-caliber pipes with multiple specifications are difficult to organize and produce; there is also a type of boring by using a rod, which is too expensive for Ti35 titanium alloy with higher material value.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of a large-caliber Ti35 titanium alloy pipe aiming at the defects of the prior art. According to the method, high-temperature homogenization treatment is added after cogging and forging of the Ti35 titanium alloy ingot, the uniformity of micro-area components is improved, the technological property and the corrosion property of the alloy are improved, meanwhile, coarse as-cast crystal grains are fully crushed through cogging and forging, the effect of high-temperature homogenization treatment is enhanced, and the control on the uniformity of the micro-components and the structure of the Ti35 titanium alloy pipe is realized.
In order to solve the technical problems, the invention adopts the technical scheme that: the preparation method of the large-caliber Ti35 titanium alloy pipe is characterized in that the Ti35 titanium alloy pipe comprises the following components by mass: 5.5 to 6.5 percent of Ta, less than or equal to 0.15 percent of Fe, less than or equal to 0.08 percent of C, less than or equal to 0.03 percent of N, less than or equal to 0.010 percent of H, 0.08 to 0.12 percent of O, and the balance of titanium and inevitable impurities; the preparation method comprises the following specific processes: firstly, cogging and forging a Ti35 titanium alloy ingot to obtain a forged blank, forging the forged blank for multiple times by fire after high-temperature homogenization treatment to obtain a bar blank, machining the surface of the bar blank, detecting a flaw to obtain a bar, machining the bar into a tube blank by using a cutting machine, annealing the tube blank, and machining to obtain a Ti35 titanium alloy tube; the diameter of the Ti35 titanium alloy pipe is larger than 240mm, and the wall thickness is larger than 5 mm.
According to the invention, cogging forging, high-temperature homogenization treatment, multi-fire forging, machining, material drawing processing, annealing and machining are sequentially carried out on the Ti35 titanium alloy ingot to obtain the Ti35 titanium alloy pipe, and the high-temperature homogenization treatment is added after the cogging forging of the Ti35 titanium alloy ingot, so that on one hand, high-temperature diffusion is beneficial to improving the uniformity of micro-area components and improving the processing property and corrosion property of the alloy, on the other hand, coarse as-cast crystal grains are fully crushed through the cogging forging, the diffusion speed and effect can be accelerated, and the control on the micro-components and the tissue uniformity of the Ti35 titanium alloy pipe is realized. The method has the advantages of short process flow and strong controllability, and effectively realizes the production of small-batch multi-specification large-caliber Ti35 titanium alloy seamless pipes.
The preparation method of the large-caliber Ti35 titanium alloy pipe is characterized in that the high-temperature homogenization treatment temperature is 1000-1150 ℃, and the time is 5-20 h. The optimized high-temperature homogenization treatment temperature and time are favorable for the diffusion of Ta in the forging stock from a high-concentration area to a low-concentration area, the uniformity of micro-area components is improved, and the technological property and the corrosion property of the alloy are improved.
The preparation method of the large-caliber Ti35 titanium alloy pipe is characterized in that a bar stock is obtained while a cutting machine is adopted to process a bar stock into a pipe blank. According to the invention, when the tube blank is processed and prepared by the material drawing machine, the obtained bar stock can be used for other purposes, the utilization rate of the Ti35 titanium alloy material is improved, and waste is avoided.
The preparation method of the large-caliber Ti35 titanium alloy pipe is characterized in that the pipe blank is placed in a non-vacuum furnace for annealing. The optimized annealing process is convenient to operate, saves the annealing cost and enlarges the application range of the invention.
The preparation method of the large-size corrosion-resistant Ti35 alloy pipe is characterized in that the Ti35 titanium alloy pipe is obtained by repeatedly aligning and processing the inside and the outside of the annealed pipe blank. The optimized machining mode is favorable for obtaining high-precision pipes with uniform wall thickness and high linearity.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, high-temperature homogenization treatment is added after cogging and forging of the Ti35 titanium alloy ingot, the uniformity of micro-area components is improved, the technological property and the corrosion property of the alloy are improved, meanwhile, coarse as-cast crystal grains are fully crushed through cogging and forging, the effect of high-temperature homogenization treatment is enhanced, the control on the uniformity of the microscopic components and the structure of the Ti35 titanium alloy pipe is realized, the process flow is short, the controllability is strong, and the production of small-batch and multi-specification large-caliber Ti35 titanium alloy seamless pipes is effectively realized.
2. Compared with the traditional bar drilling and boring process, the method has the advantages that the safety is higher, the production process is short, compared with the tube rolling process, the bar obtained when the tube blank is prepared by drawing materials can be further utilized, and the utilization rate of the materials is improved.
3. According to the invention, after the tube blank is annealed, the tube blank is subjected to inner and outer repeated alignment processing to obtain the high-precision large-caliber seamless tube with high straightness and roundness, and the tube blank has good uniform and consistent wall thickness and higher quality.
4. The invention can remove oxide skin by machining after the tube blank is annealed, thereby enabling the annealing process to be carried out in a non-vacuum furnace, having simple and convenient process and reducing cost.
5. The large-caliber Ti35 titanium alloy pipe obtained by the invention has uniform structure and good mechanical property, can be widely applied to the manufacture of nuclear energy, petrochemical industry and other equipment with higher requirements on nitric acid corrosion performance, and has wide application prospect.
The technical solution of the present invention is further described in detail by examples below.
Detailed Description
Example 1
The Ti35 titanium alloy pipe material of the embodiment comprises the following components by mass: 5.56% of Ta, 0.01% of Fe, 0.01% of C, 0.003% of N, 0.007% of H, 0.082% of O, and the balance of titanium and inevitable impurities;
the preparation method of the Ti35 titanium alloy tube material of the embodiment comprises the following steps:
firstly, cutting off a riser and the bottom of a Ti35 titanium alloy ingot with the diameter phi of 560mm, mechanically removing surface defects, heating to 1150 ℃, preserving heat for 6 hours, cogging and forging on a 4500t quick forging machine to obtain a forging stock, and preserving heat for 15 hours at 1050 ℃ after polishing the forging stock for high-temperature homogenization treatment;
step two, putting the forging stock subjected to high-temperature homogenization treatment in the step one into a resistance furnace, heating the forging stock at 100-150 ℃ above the transformation point of the Ti35 titanium alloy, discharging the forging stock out of the furnace, putting the forging stock into a quick forging machine for upsetting and drawing deformation for 4 times, then successively reducing the forging temperature by 50-100 ℃, sequentially carrying out upsetting and drawing deformation for 3 times, and drawing out for the last time to obtain a bar stock of 372mm x 3800mm (diameter x length);
step three, performing surface machining and head cutting on the bar blank obtained in the step three, and obtaining a bar material with the diameter of 362mm multiplied by 3500mm (the diameter is multiplied by the length) after flaw detection is qualified;
step four, placing the bar obtained in the step three in a deep hole cutting machine, machining positioning references on two end faces of the bar, cutting the bar, processing the bar into a tube blank to obtain a tube blank with the diameter of 362mm multiplied by 30mm multiplied by 3500mm (the outer diameter is multiplied by the wall thickness is multiplied by the length), and simultaneously obtaining a bar with the diameter of 235mm multiplied by 3500mm (the diameter is multiplied by the length);
step five, placing the tube blank obtained in the step four in an electric furnace, preserving heat for 1.5 hours at 650 ℃, carrying out annealing heat treatment to remove stress, and then carrying out inner surface and outer surface machining on the annealed tube blank to obtain the large-caliber Ti35 titanium alloy seamless tube with the diameter of 355mm multiplied by 20mm multiplied by 3500mm (outer diameter multiplied by wall thickness multiplied by length), wherein the outer diameter tolerance of the large-caliber Ti35 titanium alloy seamless tube is +/-0.4 mm, the wall thickness tolerance is +/-1.0 mm, and the straightness is not more than 1mm/3500 mm.
Example 2
The Ti35 titanium alloy pipe material of the embodiment comprises the following components by mass: 6.43% of Ta, 0.01% of Fe, 0.02% of C, 0.003% of N, 0.0011% of H, 0.10% of O and the balance of titanium and inevitable impurities;
the preparation method of the Ti35 titanium alloy tube material of the embodiment comprises the following steps:
firstly, cutting off a riser and the bottom of a Ti35 titanium alloy ingot with the diameter phi of 640mm, mechanically removing surface defects, heating to 1150 ℃, preserving heat for 8 hours, then performing cogging forging on a 8000t quick forging machine to obtain a forging stock, and preserving heat for 20 hours at 1150 ℃ after polishing the forging stock for high-temperature homogenization treatment;
step two, putting the forging stock subjected to high-temperature homogenization treatment in the step one into a resistance furnace, heating the forging stock at 100-150 ℃ above the transformation point of the Ti35 titanium alloy, discharging the forging stock out of the furnace, putting the forging stock into a quick forging machine for upsetting and drawing deformation for 4 times, then successively reducing the forging temperature by 50-100 ℃, sequentially carrying out upsetting and drawing deformation for 3 times, and drawing out for the last time to obtain a bar stock with the diameter of 362mm multiplied by 4300mm (the diameter is multiplied by the length);
step three, performing surface machining and head cutting on the bar blank obtained in the step three, and obtaining a bar material with the diameter of 362mm multiplied by 4000mm (the diameter is multiplied by the length) after flaw detection is qualified;
step four, placing the bar obtained in the step three in a deep hole cutting machine, machining positioning references on two end faces of the bar, cutting the bar, processing the bar into a tube blank to obtain a tube blank with the diameter of 362mm multiplied by 18mm multiplied by 4000mm (the outer diameter is multiplied by the wall thickness is multiplied by the length), and simultaneously obtaining a bar with the diameter of 260mm multiplied by 4000mm (the diameter is multiplied by the length);
step five, placing the tube blank obtained in the step four in a resistance furnace, preserving heat for 1.5 hours at 650 ℃ to carry out annealing heat treatment to remove stress, and then carrying out internal and external surface machining on the annealed tube blank to obtain the large-caliber Ti35 titanium alloy seamless tube with the diameter of 355mm multiplied by 10mm multiplied by 4000mm (the external diameter multiplied by the wall thickness multiplied by the length), wherein the external diameter tolerance of the large-caliber Ti35 titanium alloy seamless tube is +/-0.4 mm, the wall thickness tolerance is +/-1.0 mm, and the straightness is not more than 1mm/4000 mm.
Example 3
The Ti35 titanium alloy pipe material of the embodiment comprises the following components by mass: 5.79% of Ta, 0.01% of Fe, 0.03% of C, 0.004% of N, 0.005% of H, 0.09% of O, and the balance of titanium and inevitable impurities;
the preparation method of the Ti35 titanium alloy tube material of the embodiment comprises the following steps:
firstly, cutting off a riser and the bottom of a Ti35 titanium alloy ingot with the diameter phi of 560mm, mechanically removing surface defects, heating to 1150 ℃, preserving heat for 6 hours, cogging and forging on a 4500t quick forging machine to obtain a forging stock, and preserving heat for 5 hours at 1000 ℃ after polishing the forging stock for high-temperature homogenization treatment;
step two, putting the forging stock subjected to high-temperature homogenization treatment in the step one into a resistance furnace, heating the forging stock at 100-150 ℃ above the transformation point of the Ti35 titanium alloy, discharging the forging stock out of the furnace, putting the forging stock into a quick forging machine for upsetting and drawing deformation for 4 times, then successively reducing the forging temperature by 50-100 ℃, sequentially carrying out upsetting and drawing deformation for 3 times, and drawing out for the last time to obtain a bar stock of 372mm x 3800mm (diameter x length);
step three, performing surface machining and head cutting on the bar blank obtained in the step three, and obtaining a bar material with the diameter of 362mm multiplied by 3500mm (the diameter is multiplied by the length) after flaw detection is qualified;
step four, placing the bar obtained in the step three in a deep hole cutting machine, machining positioning references on two end faces of the bar, cutting the bar, processing the bar into a tube blank to obtain a tube blank with the diameter of 362mm multiplied by 30mm multiplied by 3500mm (the outer diameter is multiplied by the wall thickness is multiplied by the length), and simultaneously obtaining a bar with the diameter of 235mm multiplied by 3500mm (the diameter is multiplied by the length);
step five, placing the tube blank obtained in the step four in an electric furnace, preserving heat for 1.5 hours at 650 ℃, carrying out annealing heat treatment to remove stress, and then carrying out inner surface and outer surface machining on the annealed tube blank to obtain the large-caliber Ti35 titanium alloy seamless tube with the diameter of 355mm multiplied by 20mm multiplied by 3500mm (outer diameter multiplied by wall thickness multiplied by length), wherein the outer diameter tolerance of the large-caliber Ti35 titanium alloy seamless tube is +/-0.4 mm, the wall thickness tolerance is +/-1.0 mm, and the straightness is not more than 1mm/3500 mm.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (5)
1. The preparation method of the large-caliber Ti35 titanium alloy pipe is characterized in that the Ti35 titanium alloy pipe comprises the following components by mass: 5.5 to 6.5 percent of Ta, less than or equal to 0.15 percent of Fe, less than or equal to 0.08 percent of C, less than or equal to 0.03 percent of N, less than or equal to 0.010 percent of H, 0.08 to 0.12 percent of O, and the balance of titanium and inevitable impurities; the preparation method comprises the following specific processes: firstly, cogging and forging a Ti35 titanium alloy ingot to obtain a forged blank, forging the forged blank for multiple times by fire after high-temperature homogenization treatment to obtain a bar blank, machining the surface of the bar blank, detecting a flaw to obtain a bar, machining the bar into a tube blank by using a cutting machine, annealing the tube blank, and machining to obtain a Ti35 titanium alloy tube; the diameter of the Ti35 titanium alloy pipe is larger than 240mm, and the wall thickness is larger than 5 mm.
2. The method for preparing the large-caliber Ti35 titanium alloy pipe according to claim 1, wherein the temperature of the high-temperature homogenization treatment is 1000-1150 ℃ and the time is 5-20 h.
3. The method for preparing the large-caliber Ti35 titanium alloy pipe according to claim 1, wherein the bar material is obtained while the bar material is processed into a pipe blank by a cutting machine.
4. The method for preparing the large-caliber Ti35 titanium alloy pipe according to claim 1, wherein the pipe blank is placed in a non-vacuum furnace for annealing.
5. The method for preparing the large-caliber Ti35 titanium alloy pipe according to claim 1, wherein the pipe blank is annealed and then repeatedly aligned inside and outside to obtain the Ti35 titanium alloy pipe.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113351815A (en) * | 2021-05-17 | 2021-09-07 | 西部超导材料科技股份有限公司 | Preparation method of corrosion-resistant Ti35 titanium alloy bar |
| CN113695417A (en) * | 2021-09-06 | 2021-11-26 | 江苏宇钛新材料有限公司 | Preparation method of large-caliber high-performance titanium alloy pipe and product thereof |
| CN115141911A (en) * | 2022-07-05 | 2022-10-04 | 中国科学院金属研究所 | Method for improving or eliminating alloy segregation and coarse precipitated phase and alloy |
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| CN115141911A (en) * | 2022-07-05 | 2022-10-04 | 中国科学院金属研究所 | Method for improving or eliminating alloy segregation and coarse precipitated phase and alloy |
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