CN115652139A - Niobium-titanium alloy precision strip and manufacturing method thereof - Google Patents
Niobium-titanium alloy precision strip and manufacturing method thereof Download PDFInfo
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- 229910001275 Niobium-titanium Inorganic materials 0.000 title claims abstract description 38
- RJSRQTFBFAJJIL-UHFFFAOYSA-N niobium titanium Chemical compound [Ti].[Nb] RJSRQTFBFAJJIL-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 33
- 239000000956 alloy Substances 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000005096 rolling process Methods 0.000 claims abstract description 50
- 238000005097 cold rolling Methods 0.000 claims abstract description 46
- 238000005242 forging Methods 0.000 claims abstract description 37
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- 238000004381 surface treatment Methods 0.000 claims abstract description 12
- 230000007704 transition Effects 0.000 claims abstract description 4
- 238000000137 annealing Methods 0.000 claims description 22
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 238000005406 washing Methods 0.000 claims description 15
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 14
- 239000010955 niobium Substances 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 10
- 239000010936 titanium Substances 0.000 claims description 10
- 238000004321 preservation Methods 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 6
- 239000003513 alkali Substances 0.000 claims description 6
- 229910052758 niobium Inorganic materials 0.000 claims description 6
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 3
- 238000005238 degreasing Methods 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000004804 winding Methods 0.000 abstract 1
- 239000000047 product Substances 0.000 description 24
- 238000000034 method Methods 0.000 description 7
- 230000005489 elastic deformation Effects 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Abstract
The invention provides a niobium-titanium alloy precision strip and a manufacturing method thereof, wherein the niobium-titanium alloy precision strip comprises the following components in percentage by mass: ti (46-57)%, nb (43-54)%, the thickness of the niobium-titanium alloy precision strip is less than or equal to 0.6mm; the manufacturing method of the niobium-titanium alloy precision strip comprises the following steps: preparing a plate blank: cogging the cast ingot to obtain a slab, and forging the slab; warm rolling of the plate blank: heating the plate blank, and then carrying out warm rolling for a plurality of times with the total processing rate of 60-80%; surface treatment: performing surface treatment on the plate blank subjected to warm rolling to remove surface oxide skin to form a cold-rolled blank; cold rolling: and (3) carrying out roll cold rolling on the cold-rolled blank by using a special roller, wherein the special roller is a roller with the middle diameter and the edge diameter and smooth transition, and forming a tape winding finished product after cold rolling.
Description
Technical Field
The invention relates to the technical field of niobium-titanium alloy preparation, in particular to a niobium-titanium alloy precision strip and a manufacturing method thereof.
Background
The niobium-titanium alloy plate is generally prepared into a plate with the thickness not less than 2mm by adopting a sheet-type warm rolling method, is mainly used for stamping or linear cutting to process a ring with thinner wall thickness, and is used for manufacturing a gasket connected with a superconducting accelerating cavity. The plate has relatively low requirements on machining precision and surface quality because the subsequent machining of dimension and surface is also needed. For niobium-titanium alloy strip, the rolling deformation resistance is lower than that of titanium alloy, but is much higher than that of pure niobium, so that the thickness of the strip cannot be very thin during processing.
One of the applications of the niobium-titanium alloy precision strip is a key material used for preparing a low-temperature superconducting magnet, and the requirement on the wall thickness is very thin, and the requirements on the size precision and the surface quality of the strip are also high. In the prior art, although the wall thickness of the existing niobium-titanium alloy strip reaches 0.6mm, other indexes are that the deviation of the wall thickness is less than or equal to +/-0.05 mm, the surface roughness is less than or equal to 0.8 mu m, and the flatness (H/L) is less than or equal to 6 percent, which are not ideal, so that even if the niobium-titanium alloy strip is processed to the thickness of 0.6mm, the problems of surface ladle, edge wave, low dimensional precision control and the like exist.
Disclosure of Invention
In view of the above, it is desirable to provide a niobium-titanium alloy precision strip and a method for manufacturing the same.
The niobium-titanium alloy precision strip comprises the following components in percentage by mass: 46-57% of Ti, 42-53% of Nb and the balance of impurities, wherein the thickness of the niobium-titanium alloy precision strip is less than or equal to 0.6mm.
A manufacturing method of a niobium-titanium alloy precision strip comprises the following steps:
preparing a plate blank: cogging the cast ingot to obtain a slab, and forging the slab;
slab warm rolling: heating the plate blank, and then carrying out warm rolling for a plurality of times with the total processing rate of 60-80%;
surface treatment: performing surface treatment on the plate blank subjected to warm rolling to remove surface oxide skin to form a cold-rolled blank;
cold rolling: and (3) cold rolling the cold-rolled blank by using a special roller, wherein the special roller is a special-shaped roller with large middle diameter, small edge diameter and smooth transition, and a finished product is formed after cold rolling.
Has the advantages that: the niobium-titanium strip prepared by the method controls the processing rate by slab warm rolling, then adopts a special micro-convex roller for cold rolling, and also finely controls the pass deformation and the total deformation of the cold rolling, thereby forming the niobium-titanium strip with thinner thickness less than 0.6mm, better condition less than 0.09mm, the wall thickness deviation less than or equal to +/-0.02 mm, the planeness (H/L) less than or equal to 2%, the tensile strength more than or equal to 460MPa, the specified nonproportional elongation strength more than or equal to 420MPa, the elongation more than or equal to 15%, and the niobium-titanium strip has the advantages of high dimensional precision, good surface quality, stable performance and the like, and completely meets the precision requirement of the preparation of low-temperature superconducting magnets.
Detailed Description
The niobium-titanium alloy precision strip comprises the following components in percentage by mass: ti (46-57)%, C is less than or equal to 0.04%, N is less than or equal to 0.02%, H is less than or equal to 0.0045%, O is less than or equal to 0.10%, fe is less than or equal to 0.010%, ta is less than or equal to 0.10%, other impurity elements are less than or equal to 0.03%, and the balance is Nb, wherein the thickness of the niobium-titanium alloy precision strip is less than or equal to 0.6mm, preferably 0.12mm and 0.09mm, the wall thickness deviation is less than or equal to +/-0.02 mm (typically the thickness difference between the middle position and the edge of the strip), the surface roughness is less than or equal to 0.4 mu m, the planeness (H/L) is less than or equal to 2% (the planeness algorithm in GB/T3630-2017 refers to the planeness measurement method), the tensile strength is greater than or equal to 460MPa, the specified nonproportional extension strength is greater than or equal to 420MPa, the extension rate is greater than or equal to 15%, and the structure is uniform.
The invention also provides a manufacturing method of the niobium-titanium alloy precision strip, which comprises the following steps:
preparing a plate blank: cogging the cast ingot to obtain a slab, and forging the slab;
warm rolling of the plate blank: heating the plate blank, and then carrying out warm rolling for a plurality of times, wherein the total processing rate is 60-80% (namely the adjacent two times of warm rolling have large deformation, can roll coarse grains to be fine, and avoids the existence of coarse and uneven grains);
surface treatment: performing surface treatment on the plate blank subjected to warm rolling to remove surface oxide skin to form a cold-rolled blank;
cold rolling: and (3) carrying out rolling cold rolling on the cold-rolled blank by using a special roller, wherein the special roller is a micro-convex roller with the middle diameter slightly larger than the edge diameter and smooth transition, and forming a rolled tape finished product after cold rolling.
Preferably, in the "slab preparation" step: the cast ingot is first cogging forged at 1050-1150 deg.c for 4-6 hr in the forging ratio of 4-8 and the final forging temperature not lower than 800 deg.c, and then slab forged at 800-1000 deg.c for 1-3 hr in the forging ratio of 2-6, the final forging temperature not lower than 750 deg.c, the slab forging heat number of 2-4 and the slab size of 30-40 × 300-650 mm thickness.
Preferably, the step of preparing the slab is preceded by the steps of preparing an ingot: pure titanium and pure niobium are mixed according to the ratio of Ti: (46-57)%, nb: (43-54)% by weight, pressing electrode blocks, welding primary electrodes on the electrode blocks in a combined manner, and then carrying out vacuum melting for 3 times from an electric arc furnace to obtain niobium-titanium cast ingots.
Preferably, the temperature of the heating plate blank is 400-550 ℃, the heat preservation time is 0.7-1.5 hours, then the heating plate blank is subjected to 1-3 times of warm rolling, the pass deformation is 12-30%, the total processing rate is 60-80%, and the thickness of the strip blank after the warm rolling is more than 1.2mm (namely, the adjacent two times of warm rolling have large deformation, so that coarse grains can be rolled to be fine, and the existence of coarse and uneven grains is avoided).
Preferably, the warm rolled slab is subjected to alkali washing and/or acid washing to remove surface scale, then is washed with water to clean, and then is subjected to surface polishing until the surface has no visible defects.
Preferably, the alkaline washing is carried out by using 85-95% NaOH and 15-5% NaNO 3 The mixed molten liquid (keeping the temperature of the molten liquid at 420-480 ℃) is prepared by adopting the following components in volume ratio of HF: HNO 3 ：H 2 O =5 to 10:30 to 40: the rest is mixed liquid.
Preferably, in the step of cold rolling, the number of cold rolling is 3 to 5, the pass deformation amount in the cold rolling is 9 to 25 percent (the deformation amount of the cold rolling in two adjacent passes), the total reduction ratio is 35 to 60 percent (the deformation amount of the blank after the annealing in two passes and before the cold rolling), the thickness of the strip formed after the cold rolling is less than or equal to 0.6mm, the pass deformation amount and the total reduction ratio deformation amount are large, the purpose is to refine crystal grains, and the deformation amount is the deformation amount of the cold rolling. The cold rolling thickness reaches 0.6mm, the pass deformation and the total processing rate are greatly influenced by the thickness of the strip, the control requirements of each process are strict, otherwise, the strip is easy to crack or break during the cold rolling.
Preferably, the strip formed after cold rolling has a thickness of less than 0.12mm.
Preferably, the intermediate annealing is also performed by vacuum heat treatment before the cold rolling.
Preferably, the degreasing treatment is carried out before the vacuum annealing, the intermediate vacuum annealing is carried out between two rolling passes (one rolling pass is between the initial pass rolling after the annealing and the last pass rolling which must be softened and annealed for work hardening), and the finished product vacuum annealing treatment is carried out for regulating and controlling the mechanical property after the finished product rolling.
Preferably, an oil removal treatment is also provided after completion of one rolling pass: the plate and strip which needs to be subjected to heat treatment after cold rolling needs to be subjected to oil removal treatment, wherein the oil removal treatment is ultrasonic cleaning oil removal or oil removal agent cleaning.
Preferably, intermediate softening and finished product heat treatment are also arranged after the oil removal treatment: the intermediate softening and the finished product heat treatment both adopt vacuum annealing heat treatment. (the intermediate annealing temperature is 750-900 ℃, the heat preservation is 1-3 hours, the vacuum degree is not lower than 1 multiplied by 10 - 1 Pa. The annealing temperature of the finished product is 300-450 ℃, the heat preservation is carried out for 1-3 hours, and the vacuum degree is not lower than 5 multiplied by 10 -2 Pa)
Preferably, the diameter of the middle of the special roller is slightly larger than the diameter of the middle of the edge by 0.1-0.6 mm. (by adopting a special micro-convex roller for cold rolling, a strip with approximately consistent thickness of the edge and the middle is formed, and the deviation of the wall thickness of the strip is less than or equal to +/-0.02 mm)
Example 1Nb-50Ti niobium-titanium alloy strip having a thickness of 0.6mm x a width of 600mm x 20000mm (arbitrary length =20000mm, not specifically limited)
(1) Preparation of ingot
The pure titanium billet and the pure niobium are mixed according to the following ratio: ti:50 percent; nb:50 percent; pressing an electrode block, welding a primary electrode by the electrode block combination, and then melting to obtain phi 600mm by 3 times of vacuum consumable electrode arc furnace.
(2) Preparation of a slab
Coating the surface of the cast ingot, wherein the forging cogging temperature is 1100 ℃, the heat preservation time is 6 hours, the forging ratio is 8, the finish forging temperature is 850 ℃, the slab forging temperature is 850-900 ℃, the heat preservation time is 2-3 hours (the specific 3 times of forging are 3, 2.5 and 2 hours in sequence), the forging ratio is 3-4 (the specific 3 times of forging are 4, 3.8 and 3 in sequence), the finish forging temperature is 800 ℃, the specification of the slab is 30mm in thickness, 630mm in width and more than or equal to 700mm, and the forging heat number of the slab is 3.
(3) Warm rolling of the plate blank: heating by 3 times at 450-500 deg.C for 1 hr, with total processing rate of 60-70%, and rolling to thickness of 1.8mm.
(4) Surface treatment: alkali washing the slab (95% NaOH +5% of the ratio) 3 ) And acid washing (the mixture ratio is HF: HNO 3 ： H 2 O =10:40:50 And (4) carrying out surface polishing after washing and cleaning.
(5) Intermediate vacuum annealing: annealing at 800 deg.C for 1 hr, and vacuum degree not lower than 1 × 10 -1 Pa。
(6) Cold rolling: the pass deformation and the total processing rate are strictly controlled, the pass deformation is 12-18%, and the total processing rate is 40-50%. The working roller with convexity (specifically, a 0.3, 0.4, 0.5 and 0.6mm flat roller with the thickness of 0.3-0.6 mm) is adopted to carry out cold rolling of 2 rolling passes, and the final product is processed to the thickness of 0.6 +/-0.02 mm (the thickness of 2 rolling passes is 1.0mm and 0.6mm respectively).
(7) And (3) heat treatment of a finished product: the annealing temperature of the finished product is 350 ℃, the heat preservation is carried out for 2 hours, and the vacuum degree is not lower than 5 multiplied by 10 -2 And Pa, cooling along with the furnace.
(8) And (3) finishing: and cutting edges of the finished product annealed strip, and rewinding to form a coiled finished product.
(9) And (5) detecting the performance of the finished product. See table 1 for test data.
Comparative example 1
On the basis of example 1, the control of the following steps was varied:
the cold rolling adopts flat roll rolling, when the rolling thickness is reduced to about 0.6mm, the problems of surface package, edge wave (flatness (H/L) is about 6%), large wall thickness deviation (the thickness of the middle position of a strip is 0.69mm, the thickness of the edge is 0.59mm, the wall thickness deviation is 0.1 mm) and the like occur, and even strip breakage is generated, so that the rolling is difficult to continue.
Because the roller and the deformed metal generate certain deformation in the rolling process, namely the roller still needs to generate elastic deformation although the rigidity is higher, and the rolled metal generates shaping and elastic deformation. Therefore, in the case of flat rolling, the maximum amount of elastic deformation occurring when the center portion of the roll is away from the fixed support point causes the reduction thickness of the center portion of the sheet or strip to be minimum in the width direction, that is, the sheet or strip corresponds to concave rolling, and the thickness deviation between the center position and the edge position increases. In order to solve the problem, a certain convexity can be polished by a flat roller, and the corresponding elastic deformation is just balanced in the rolling deformation process so as to change the rolling into the flat roller rolling, so that the thickness deviation of the middle position and the edge position of the plate strip can be greatly reduced.
Example 2Nb-55Ti niobium-titanium alloy strip having a thickness of 0.12mm x a width of 500mm x 20000mm (arbitrary length =20000mm, not specifically limited)
(1) Preparation of ingot
The pure titanium billet and the pure niobium are mixed according to the following ratio: ti:55%, nb:45 percent; pressing an electrode block, welding a primary electrode by the electrode block combination, and then melting to obtain phi 600mm by 3 times of vacuum consumable electrode arc furnace.
(2) Preparation of a slab
Coating the surface of the cast ingot, wherein the forging cogging temperature is 1100 ℃, the temperature is kept for 6 hours, the forging ratio is 6, the finish forging temperature is 800 ℃, the slab forging temperature is 900-950 ℃, the temperature is kept for 2-3 hours, the forging ratio is 3-4, the finish forging temperature is 750 ℃, the specification of the slab is that the thickness is 30mm, the width is 530mm, the thickness is more than or equal to 600mm, and the forging heat number of the slab is 3.
(3) Warm rolling of the plate blank: heating with 3 times of fire at 450-500 deg.C (480, 450, 400 deg.C in sequence), maintaining for 1 hr, and rolling to 1.25mm thickness with total work rate of 60-75% (75, 70, 65% in sequence).
(4) Surface treatment: alkali washing the slab (the ratio is 88% NaOH +12% of the content of NaNO) 3 ) And acid washing (the mixture ratio is HF: HNO 3 ： H 2 O =6:32:62 And (4) carrying out surface polishing after washing and cleaning.
(5) Intermediate vacuum annealing: annealing at 750 deg.C, maintaining for 1 hr, and vacuum degree not lower than 1 × 10 -1 Pa。
(6) Cold rolling: the pass processing rate and the total processing rate are strictly controlled, the pass deformation is 12-20%, and the total processing rate is 45-60%. Adopting a working roller with convexity (0.2-0.5 mm) to carry out cold rolling final processing in 3 rolling passes until the thickness of a finished product is 0.12 +/-0.012 mm (the thickness of the 3 rolling passes is 0.48mm, 0.22mm and 0.12mm respectively).
(7) And (3) heat treatment of a finished product: the annealing temperature of the finished product is 350 ℃, the heat preservation is carried out for 3 hours, and the vacuum degree is not lower than 5 multiplied by 10 -2 And Pa, cooling along with the furnace.
(8) And (3) finishing: and cutting edges of the finished product annealed strip, and rewinding to form a coiled finished product.
(9) And (5) detecting the performance of the finished product. The test data are presented in table 1.
Example 3 method for producing Nb-47Ti niobium titanium alloy strip having thickness of 0.09mm. Times.width of 300 mm. Times.30000 mm or more
(1) Preparation of ingot
The pure titanium billet and the pure niobium are mixed according to the following mass ratio: ti:47%, nb:53 percent; and pressing an electrode block, welding a primary electrode by the electrode block combination, and then smelting to obtain phi 530mm by performing vacuum consumable arc furnace smelting for 3 times.
(2) Preparation of a slab
Coating the surface of the cast ingot, wherein the forging cogging temperature is 1150 ℃, the temperature is kept for 6 hours, the forging ratio is 5, the finish forging temperature is 800 ℃, the slab forging temperature is 850-900 ℃, the temperature is kept for 1-3 hours, the forging ratio is 3-4, the finish forging temperature is 750 ℃, the specification of the slab is that the thickness is 40mm, the width is 350mm, the thickness is more than or equal to 800mm, and the forging heat number of the slab is 2.
(3) Warm rolling of the plate blank: heating by 3 times at 450-500 deg.C for 1 hr, with total processing rate of 70-80%, and rolling to thickness of 1.2mm.
(4) Surface treatment: alkali washing the slab (85% NaOH +15% NaNO) 3 ) And acid washing (the mixture ratio is HF: HNO 3 ： H 2 O =10:40:50 And (4) carrying out surface polishing after washing and cleaning.
(5) Intermediate vacuum annealing: annealing at 850 deg.C, maintaining for 1 hr, and vacuum degree not lower than 1 × 10 -1 Pa。
(6) Cold rolling: the pass deformation and the total processing rate are strictly controlled, the pass deformation is 12-20%, and the total processing rate is 35-60% (the cold rolling pass deformation and the total processing rate are controlled in the above range, if the cold rolling pass deformation and the total processing rate are too small, the shaping can not be fully exerted, the process requirement can not be met, and if the cold rolling pass deformation and the total processing rate are too large, the crack or the fracture defect is easy to occur). The working roller with convexity (0.1-0.4 mm) is adopted to be finally processed into the finished product with the thickness of 0.09 +/-0.01 mm through 4 rolling passes (the thickness of the 4 rolling passes is 0.48mm, 0.24mm, 0.14mm and 0.09mm respectively).
(7) And (3) heat treatment of a finished product: the annealing temperature of the finished product is 450 ℃, the heat preservation is carried out for 2 hours, and the vacuum degree is not lower than 5 multiplied by 10 -2 And Pa, cooling along with the furnace.
(8) And (3) finishing: and trimming the edge of the finished product annealed strip, and rewinding the edge into a coil-shaped finished product.
(9) And (5) detecting the performance of the finished product, wherein the detection data is shown in a table 1.
TABLE 1
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (18)
1. The niobium-titanium alloy precision strip is characterized by comprising the following components in percentage by mass: 46-57% of Ti, 42-53% of Nb and the balance of impurities, wherein the thickness of the niobium-titanium alloy precision strip is less than or equal to 0.6mm.
2. The niobium-titanium alloy precision strip of claim 1, wherein the niobium-titanium alloy precision strip comprises, in mass percent: 46-57 percent of Ti, less than or equal to 0.04 percent of C, less than or equal to 0.02 percent of N, less than or equal to 0.0045 percent of H, less than or equal to 0.10 percent of O, less than or equal to 0.010 percent of Fe, less than or equal to 0.10 percent of Ta, less than or equal to 0.03 percent of other impurity elements, and the balance of Nb, wherein the thickness of the niobium-titanium alloy precision strip is less than or equal to 0.6mm.
3. The precision niobium titanium alloy strip of claim 2, wherein: the thickness of the niobium-titanium alloy precision strip is 0.09 mm-0.12 mm or 0.12 mm-0.6 mm, and the wall thickness deviation is less than or equal to +/-0.02 mm.
4. The precision niobium titanium alloy strip of claim 3, wherein: the surface roughness of the niobium-titanium alloy precision strip is less than or equal to 0.4 mu m, the planeness (H/L) is less than or equal to 2 percent, the tensile strength is greater than or equal to 460MPa, the specified non-proportional elongation is greater than or equal to 420MPa, and the elongation is greater than or equal to 15 percent.
5. The manufacturing method of the niobium-titanium alloy precision strip is characterized by comprising the following steps of:
preparing a plate blank: cogging the cast ingot to obtain a slab, and forging the slab;
warm rolling of the plate blank: heating the plate blank, and then carrying out warm rolling for a plurality of times with the total processing rate of 60-80%;
surface treatment: performing surface treatment on the plate blank subjected to warm rolling to remove surface oxide skin to form a cold-rolled blank;
cold rolling: and (3) cold rolling the cold-rolled blank by using a special roller, wherein the special roller is a special-shaped roller with large middle diameter, small edge diameter and smooth transition, and a finished product is formed after cold rolling.
6. The method for producing a titanium alloy precision strip according to claim 5, characterized in that:
the step of preparing the plate blank comprises the following steps: the ingot is first cogging forged at 1050-1150 deg.c for 4-6 hr in the forging ratio of 4-8 and the final forging temperature not lower than 800 deg.c, and then slab forged at 800-1000 deg.c for 1-3 hr in the forging ratio of 2-6 and the final forging temperature not lower than 750 deg.c in the forging ratio of 2-4 times in the thickness of 30-40 x in the width of 300-650 mm.
7. The method for producing a titanium alloy precision strip according to claim 6, characterized in that: and the preparation of cast ingots is also arranged before the step of preparing the plate blank: pure titanium and pure niobium are mixed according to the ratio of Ti: (46-57)%, nb: (42-53)% by weight, pressing electrode blocks, welding primary electrodes by the electrode blocks in a combined manner, and then smelting the niobium-titanium cast ingot by performing 3 times of vacuum consumable electrode arc furnaces.
8. The method for producing a titanium alloy precision strip according to claim 5, characterized in that the "slab warm rolling": the temperature of the heating plate blank is 400-550 ℃, the heat preservation is carried out for 0.7-1.5 hours, then 1-3 times of warm rolling are carried out, the pass deformation is 12% -30%, the total processing rate is 60-80%, and the thickness of the strip blank after the warm rolling is more than 1.2mm.
9. The method for producing a titanium alloy precision strip according to claim 5, characterized by comprising the step of "surface treatment": the warm rolled slabs are subjected to alkali and/or acid washing to remove surface scale, followed by water washing for cleaning.
10. The method for producing a titanium alloy precision strip according to claim 9, characterized by comprising: the alkali washing adopts 85-95% of NaOH and 15-5% of NaNO according to the mass ratio 3 The acid cleaning adopts HF: HNO 3 ：H 2 O =5 to 10:30 to 40: the rest is mixed liquid.
11. The method for producing a titanium alloy precision strip according to claim 5, characterized in that: in the cold rolling step, the number of cold rolling times is 3-5, the pass deformation amount in the cold rolling is 9-25%, the total working ratio is 35-60%, and the thickness of the strip formed after the cold rolling is less than or equal to 0.6mm.
12. The method for producing a titanium alloy precision strip according to claim 11, characterized by comprising: the thickness of the strip formed after cold rolling is 0.12mm or less.
13. The method for producing a titanium alloy precision strip according to claim 11, characterized by comprising: the thickness of the strip formed after cold rolling is 0.09mm or less.
14. The method for producing a titanium alloy precision strip according to claim 11, characterized by comprising: and performing intermediate annealing by adopting vacuum heat treatment before cold rolling.
15. The method for producing a titanium alloy precision strip according to claim 11, characterized by comprising: and (4) performing oil removal treatment and intermediate vacuum annealing between two cold rolling, and performing finished product vacuum annealing treatment after the finished product is rolled.
16. The method for producing a titanium alloy precision strip according to claim 11, further comprising, after the cold rolling, a degreasing treatment: the plate and strip which needs to be subjected to heat treatment after cold rolling needs to be subjected to oil removal treatment, wherein the oil removal treatment is ultrasonic cleaning oil removal or oil removal agent cleaning.
17. The method for producing a titanium alloy precision strip according to claim 15, characterized by further comprising, after the degreasing treatment, intermediate softening and finish heat treatment: the intermediate softening and the finished product heat treatment both adopt vacuum annealing heat treatment.
18. The method for producing a titanium alloy precision strip according to claim 5, characterized in that: the diameter of the middle of the special roller is 0.1-0.6 mm larger than that of the edge.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211347689.6A CN115652139B (en) | 2022-10-31 | 2022-10-31 | Niobium-titanium alloy precise strip and manufacturing method thereof |
| PCT/CN2023/128464 WO2024093998A1 (en) | 2022-10-31 | 2023-10-31 | Niobium-titanium alloy precision strip and manufacturing method therefor |
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| CN202211347689.6A CN115652139B (en) | 2022-10-31 | 2022-10-31 | Niobium-titanium alloy precise strip and manufacturing method thereof |
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Also Published As
| Publication number | Publication date |
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| CN115652139B (en) | 2023-11-24 |
| WO2024093998A1 (en) | 2024-05-10 |
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