CN101824564A - Titanium alloy TC4 cold-rolled tube and production method thereof - Google Patents
Titanium alloy TC4 cold-rolled tube and production method thereof Download PDFInfo
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Abstract
The invention relates to a titanium alloy, in particular to a titanium alloy TC4 cold-rolled tube and a production method thereof. By weight, the composition of the alloy is as follows: the balance of Ti, 5.5 percent to 6.75 percent of Al, 3.5 percent to 4.5 percent of V, less than or equal to 0.1 percent of Fe, less than or equal to 0.1 percent of C, less than or equal to 0.03 percent of N, less than or equal to 0.015 percent of H and less than or equal to 0.15 percent of O. The specification of the TC4 cold-rolled tube is outer diameter multiplied by wall thickness (however, the ratio of the outer diameter to the wall thickness is larger than 2). In the process of cold-rolling the titanium alloy tube, lubricant is added on the inner and the outer surfaces of the tube blank and the semi-finished tube, rolling is then carried out, the tube is annealed in oxygen after each rolling pass, a single edge is inwardly sheared by 0mm to 0.8mm, scale cinder and flaws are completely removed before the last one to two passes, the tube is washed by alkali and acid or acid and then by water and then rolled before a finished product is produced after 1 to 16 rolling passes, the rolled finished product is annealed in oxygen or vacuum, and the annealed finished product is washed by alkali and acid or acid again. The performance of the titanium alloy (TC4) cold-rolled tube is good, the metallographic structure is uniform, and the surface quality of the tube is good.
Description
Technical field
The present invention relates to titanium alloy tube and preparation thereof, specifically a kind of TC4 cold rolled tube and preparation method thereof.
Background technology
Continuous development along with titanium alloy, more and more demand high strength, high tenacity, high temperature resistant and corrosion resistant titanium alloy, especially the titanium alloy pipe demand is more and more, and the difficulty of processing of titanium alloy pipe is increasing, titanium alloy TC 4 tubing major applications in the oil field, industry such as Nuclear power plants, chemical industry, and present titanium alloy TC 4 tubing all be usually sheet material volume weldering, bar draw the hole, hinge in the outer car after the cross piercing, present domesticly do not have a family can be cold rolling to go out titanium alloy (TC4) tubing.
Summary of the invention
The object of the present invention is to provide a kind of titanium alloy (TC4) pipe that is suitable for the modern market demand, TC4 tubing intensity height, good toughness, high temperature resistant and corrosion-resistant that this method is cold rolling, reach 895～1300MPa, unit elongation 8～25% with the tensile strength (Rm) in its performance of titanium alloy TC 4 pipe of aforesaid method processing.
For achieving the above object, the technical solution used in the present invention is:
A kind of titanium alloy (TC4) pipe, alloy composition is by weight percentage: Al (5.5～6.75) %, V (3.5～4.5) %, Fe≤0.1%, C≤0.1%, N≤0.03%, H≤0.015%, O≤0.15%, Ti surplus;
The preparation method of a kind of titanium alloy (TC4) cold rolled tube, alloy raw material consists of by weight percentage: Al (5.5～6.75) %, V (3.5～4.5) %, Ti surplus; Pipe that above-mentioned raw materials is processed into and semifinished tube according to a conventional method, and Fe≤0.1% in the control titanium alloy TC 4, C≤0.1%, N≤0.03%, H≤0.015%, O≤0.15% carries out cold rolling forming then; Its TC4 cold rolled tube specification is
(but the ratio of external diameter and wall thickness must greater than 2);
When cold rolling this titanium alloy pipe, pipe or semifinished tube surfaces externally and internally add lubricant, be rolled then, whenever must adopt oxidizing annealing after rolling a passage, the oxidizing annealing temperature is 600～900 ℃ of insulations 1～3 hour, each passage rolling reduction is 15%～65%, and roll speed is 20～90 times/minute;
When rolling first or second passage, the monolateral 0～0.8mm of hinge in carrying out; Must alkali cleaning before rolling last 1 or 2 passage and pickling or pickling after washing oxide skin and defective are all pared off, be rolled again, the rolling pass number is that 1-16 (is that the minimum passage of rolling pass just goes out finished product, the slowest 16 passages go out finished product), finished product after rolling the finishing adopts oxidizing annealing or vacuum annealing, and the oxidizing annealing temperature is 600～900 ℃ of insulations 1～3 hour; Vacuum annealing temperature is 600～900 ℃ of insulations 1～3 hour, and the finished product after the annealing then will carry out alkali cleaning and pickling or pickling after washing again, obtains final product.
Tensile strength (Rm) in this product titanium alloy (TC4) cold rolled tube performance can reach (895～1300) MPa behind normal heat processing and solid solution aging, unit elongation is at (8～25) %, its metallographic structure is even, can reach two kinds of metallographic structures of stress relieving and perfect recrystallization annealed.This titanium alloy (TC4) product cold rolled tube surface quality is good, surface-brightening, defectives such as its surperficial corrugationless.
Described lubricant is paraffin, molybdenumdisulphide or molybdenumdisulphide lithium soap grease.
In cold rolling this titanium alloy pipe process, described rolling pass number is generally 1-16; Also may be for once, in rolling pass is that a passage is when just going out finished product, at first pipe or semifinished tube are carried out oxidizing annealing, annealing temperature is 600～900 ℃ of insulations 1～3 hour, and annealing back alkali cleaning and pickling or pickling after washing all pare off oxide skin and defective, pipe or semifinished tube surfaces externally and internally add lubricant, be rolled then, rolling reduction is 15%～65%, and roll speed is 20～90 times/minute; When rolling, the monolateral 0～0.8mm of hinge in carrying out; Finished product after rolling the finishing adopts oxidizing annealing or vacuum annealing, and the oxidizing annealing temperature is 600～900 ℃ of insulations 1～3 hour; Vacuum annealing temperature is 600～900 ℃ of insulations 1～3 hour; Finished product after the annealing then will carry out alkali cleaning and pickling or pickling after washing again, obtains final product.
The present invention compared with prior art has following beneficial effect:
1. intensity height, corrosion-resistant: (895～1300MPa) than TA18 pipe (620MPa) height close with the TC4 composition, and erosion resistance is also managed considerably beyond TA18 for titanium alloy TC 4 cold-rolled tube intensity of the present invention (Rm).
2. reduce cost, shorten the production cycle: all will carry out vacuum annealing after existing titanium alloy tube production technique per pass is rolling, and titanium alloy TC 4 cold-rolled tube material production technique per pass of the present invention all carries out oxidation (antivacuum) annealing after rolling, has so both reduced power consumption cost and has also shortened the production cycle.
3. yield rate height, quality is good, and performance is excellent: TC4 cold rolled tube of the present invention is drawn hole pipe yield rate height than bar, and TC4 cold rolled tube utilization perforation pipe is rolled, loss is little, yield rate height, bar are drawn the hole pipe then needs to draw out a lot of bits waste products, and loss is big, yield rate is low, bar is drawn hole the pipe just quality and the performance of bar, and the TC4 cold rolled tube is to carry out deep processing on the basis of bar, and then bar is drawn the quality, performance of hole pipe quality, the performance far away from the TC4 cold rolled tube.
4. metal inside is organized: the present invention adopts the TC4 cold rolled tube, the metal inside tissue will be good than hinge pipe in the outer car of perforation pipe many, the TC4 cold rolled tube is in the course of processing, carry out oxidizing annealing, can make crystal grain reply original state, give when cold rolling and simultaneously pipe vertically, balanced power radially, make the inner grain structure densification of pipe matrix; Do not make crystal grain reply original state and cut with scissors pipe in the outer car of perforation pipe, and have only its grain structure pulling, TC4 is cold rolling to be run well so the interior strand pipe of the outer car of perforation pipe metal structure does not have.
5. long service life: the congenital dense structure of the cold rolling seamless tube of TC4 of the present invention, the sheet material welded tube is then inconsistent at commissure structural state and matrix, causes the fatigability intergranular cracking easily, so the cold rolling seamless tube of TC4 is arranged than sheet material welded tube long service life.
6. surface quality is good: what titanium alloy of the present invention (TC4) cold rolled tube will be good than the TC4 pipe surfaces externally and internally quality of extruding is many, titanium alloy (TC4) cold rolled tube surfaces externally and internally light, and defective such as non-wrinkle, cut, and the surfaces externally and internally of extruding is then brightless, and cut is arranged.
7. titanium alloy (TC4) cold rolled tube has been replenished domestic blank.
Embodiment
The present invention just can obtain new titanium alloy TC4 cold rolled tube by the working method of uniqueness and rolling technology, below by embodiment in detail the present invention is described in detail.
Adopt the cold rolling method for making of oxidizing annealing: step is carried out routinely, at first uses the raw material titanium sponge, vananum, aluminium is prepared burden, and (Al 6% by weight percentage, and V 4%, the Ti surplus is mixed raw material), the extruding electrode, grid for welding, shove charge melting ingot casting, sampling analysis strips off the skin, Fe≤0.1% in the control titanium alloy TC 4, C≤0.1%, N≤0.03%, H≤0.015%, O≤0.15% forges bar (excellent base) with ingot casting, the blanking of bar car light is bored a hole into pipe or is drawn the hole with optical wand with optical wand and is squeezed into pipe, again with pipe tack, cold rolling cogging, degreasing, oxidizing annealing, interior hinge, rolling, repair and scrape, alkali cleaning, pickling, washing, finish rolling, tack, annealing, sampling analysis, scale blanking.
Alkali cleaning proportioning, pickling weight proportion among the following embodiment are
Alkaline wash (using after the heat fused): [85～95%NaOH+15～5%NaNO
3(or KNO
3)]
Pickle solution: [30～40%HNO
3+ 2～10%HF+ surplus H
2O]
Embodiment 1.
Concrete preparation process is as follows:
1. by the TC4 pipe
Internal surface of bloom adds the paraffin lubricant, is rolled, and the first passage rolling reduction is 24%, roll speed 30 times/minute, and oxidizing annealing, 800 ℃ of insulations of annealing temperature 1.5 hours are repaiied behind the air cooling and are scraped defective;
2. the internal surface of bloom that gets off of first road adds the paraffin lubricant, is rolled, and second passage rolling reduction is 28%, roll speed 30 times/minute, monolateral in hinge 50 roads, oxidizing annealing, 800 ℃ of insulations of annealing temperature 1.5 hours are repaiied behind the air cooling and are scraped defective;
3. the internal surface of bloom that gets off of second road adds the paraffin lubricant, be rolled, the 3rd passage rolling reduction is 35%, roll speed 35 times/minute is rolled the back two ends and is respectively ftractureed 5 centimeters, and the intermediate surface quality is better, cut the termination, oxidizing annealing, 800 ℃ of insulations of annealing temperature 1.5 hours are repaiied behind the air cooling and are scraped defective;
4. the internal surface of bloom that gets off of the 3rd road adds the paraffin lubricant, is rolled, and the 4th passage rolling reduction is 15%, mill product
Roll speed 35 times/minute, oxidizing annealing, 800 ℃ of insulations of annealing temperature 1.5 hours, air cooling, pickling after the alkali cleaning, washing;
5. finished product
800 ℃ of oxidizing annealings, 2 hours, air cooling, its performance actual measurement of sampling analysis is Rm970MPa, Rp0.2815MPa, A 13.5%;
6. finished product
750 ℃ of vacuum annealings are incubated 2 hours, furnace cooling, and its performance actual measurement of sampling analysis is Rm935MPa, Rp0.2820MPa, A 12.5%.
Embodiment 2.
Concrete preparation process is as follows:
1. by the TC4 pipe
The pipe surfaces externally and internally adds paraffin, molybdenumdisulphide lithium soap grease lubricant respectively, is rolled, and the first passage rolling reduction is 15%, roll speed 20 times/minute, monolateral interior hinge 80 roads, oxidizing annealing, 600 ℃ of insulations of annealing temperature 3 hours are repaiied behind the air cooling and are scraped defective.
2. the pipe surfaces externally and internally that gets off of first road adds paraffin, molybdenumdisulphide lithium soap grease lubricant respectively, be rolled, second passage rolling reduction is 38%, roll speed 30 times/minute, roll the back two ends and respectively ftracture 6 centimeters, the intermediate surface quality is better, cuts the termination, oxidizing annealing, 600 ℃ of insulations of annealing temperature 3 hours are repaiied behind the air cooling and are scraped defective.
3. the pipe surfaces externally and internally that gets off of second passage adds paraffin, molybdenumdisulphide lithium soap grease lubricant respectively, is rolled, and the 3rd passage rolling reduction is 40%, roll speed 35 times/minute, oxidizing annealing, 600 ℃ of insulations of annealing temperature 3 hours are repaiied behind the air cooling and are scraped defective.
4. the pipe surfaces externally and internally that gets off of the 3rd passage adds paraffin, molybdenumdisulphide lithium soap grease lubricant respectively, is rolled, and the 4th passage rolling reduction is 17%, mill product
Roll speed 35 times/minute, oxidizing annealing, 600 ℃ of insulations of annealing temperature 3 hours, air cooling, alkali cleaning, pickling, washing.
5. finished product
650 ℃ of oxidizing annealings, 2.5 hours, air cooling, (solid solution behind the solid solution aging
840～960 ℃, 29～61 seconds, air cooling or water-cooled, 470～570 ℃ of actual effects, 4～8 hours, air cooling.Its performance actual measurement of sampling analysis is Rm1300MPa, Rp0.2 1198MPa, and A 8%;
6. finished product
650 ℃ of vacuum annealings are incubated 2.5 hours, furnace cooling, (840～960 ℃ of solid solutions, 29～61 seconds, air cooling or water-cooled, 470～570 ℃ of actual effects, 4～8 hours, air cooling behind the solid solution aging.Its performance actual measurement of sampling analysis is Rm1204MPa, Rp0.2 1100MPa, and A 9%.
Embodiment 3.
Concrete preparation process is as follows:
1. by the TC4 pipe
The pipe surfaces externally and internally adds molybdenum disulfide lubricant respectively, is rolled, and the first passage rolling reduction is 25%, roll speed 30 times/minute, and oxidizing annealing, 900 ℃ of insulations of annealing temperature 1 hour are repaiied behind the air cooling and are scraped defective.
2. the pipe surfaces externally and internally that gets off of first passage adds molybdenum disulfide lubricant respectively, is rolled, and second passage rolling reduction is 35%, roll speed 35 times/minute, monolateral interior hinge 50 roads, oxidizing annealing, 900 ℃ of insulations of annealing temperature 1 hour are repaiied behind the air cooling and are scraped defective.
3. the pipe surfaces externally and internally that gets off of second passage adds molybdenum disulfide lubricant respectively, be rolled, the 3rd passage rolling reduction is 38%, roll speed 35 times/minute is rolled the back two ends and is respectively ftractureed 6 centimeters, and the intermediate surface quality is better, cut the termination, oxidizing annealing, 900 ℃ of insulations of annealing temperature 1 hour are repaiied behind the air cooling and are scraped defective.
4. the pipe surfaces externally and internally that gets off of the 3rd passage adds molybdenum disulfide lubricant respectively, is rolled, and the 4th passage rolling reduction is 36%, roll speed 45 times/minute, oxidizing annealing, 900 ℃ of insulations of annealing temperature 1 hour, air cooling, alkali cleaning, pickling, washing.
5. the 4th the pipe surfaces externally and internally interpolation molybdenum disulfide lubricant that passage is got off is rolled the 5th passage mill product
Deflection is 20%, roll speed 90 times/minute, oxidizing annealing, 900 ℃ of insulations of annealing temperature 1 hour, air cooling, alkali cleaning, pickling, washing.
6. finished product
900 ℃ of oxidizing annealings, 1 hour, air cooling, its performance actual measurement of sampling analysis is Rm895MPa, Rp0.2 820MPa, A 25%;
7. finished product
900 ℃ of vacuum annealings are incubated 1 hour, furnace cooling, and its performance actual measurement of sampling analysis is Rm900MPa, Rp0.2 828MPa, A 23%.
Embodiment 4.
Concrete preparation process is as follows:
1. by the TC4 pipe
Outer surface of tube blank adds molybdenumdisulphide lithium soap grease lubricant, is rolled, and the first passage rolling reduction is 15%, roll speed 30 times/minute, and oxidizing annealing, 800 ℃ of insulations of annealing temperature 1.5 hours are repaiied behind the air cooling and are scraped defective.
2. the outer surface of tube blank that gets off of first passage adds molybdenumdisulphide lithium soap grease lubricant, is rolled, and second passage rolling reduction is 35%, roll speed 35 times/minute, monolateral interior strand 50 roads, oxidizing annealing, 800 ℃ of insulations of annealing temperature 1.5 hours are repaiied behind the air cooling and are scraped defective.
3. second outer surface of tube blank interpolation molybdenumdisulphide lithium soap grease lubricant that passage is got off is rolled, and the 3rd passage rolling reduction is 40%, roll speed 35 times/minute, and oxidizing annealing, 800 ℃ of insulations of annealing temperature 1.5 hours are repaiied behind the air cooling and are scraped defective.
4. the 3rd outer surface of tube blank that passage is got off adds molybdenumdisulphide lithium soap grease lubricant, is rolled, and the 4th passage rolling reduction is 35%, roll speed 40 times/minute, oxidizing annealing, 900 ℃ of insulations of annealing temperature 1 hour, air cooling, alkali cleaning, pickling, washing.
5. the 4th outer surface of tube blank that passage is got off adds molybdenumdisulphide lithium soap grease lubricant, is rolled the 5th passage mill product
Deflection is 15%, roll speed 35 times/minute, oxidizing annealing, 800 ℃ of insulations of annealing temperature 1.5 hours, air cooling, alkali cleaning, pickling, washing.
6. finished product
800 ℃ of oxidizing annealings, 1.5 hours, air cooling, its performance actual measurement of sampling analysis is Rm913MPa, Rp0.2 840MPa, A 15.8%;
7. finished product
800 ℃ of vacuum annealings are incubated 1.5 hours, furnace cooling, and its performance actual measurement of sampling analysis is Rm908MPa, Rp0.2 828MPa, A 14.5%.
Embodiment 5.
Concrete preparation process is as follows:
1. by the TC4 pipe
Internal surface of bloom adds paraffin, and outer surface of tube blank molybdenumdisulphide lithium soap grease lubricant is rolled, and the first passage rolling reduction is 30%, roll speed 30 times/minute, and oxidizing annealing, 750 ℃ of insulations of annealing temperature 2 hours are repaiied behind the air cooling and are scraped defective.
2. the internal surface of bloom that gets off of first passage adds paraffin, outer surface of tube blank molybdenumdisulphide lithium soap grease lubricant, be rolled, second passage rolling reduction is 40%, roll speed 30 times/minute, monolateral interior hinge 50 roads, oxidizing annealing, 750 ℃ of insulations of annealing temperature 2 hours are repaiied behind the air cooling and are scraped defective.
3. the internal surface of bloom that gets off of second passage adds paraffin, and outer surface of tube blank molybdenumdisulphide lithium soap grease lubricant is rolled, the 3rd passage rolling reduction is 45%, roll speed 35 times/minute, oxidizing annealing, 750 ℃ of insulations of annealing temperature 2 hours are repaiied behind the air cooling and are scraped defective.
4. the 3rd internal surface of bloom that passage is got off adds paraffin, and outer surface of tube blank molybdenumdisulphide lithium soap grease lubricant is rolled, the 4th passage rolling reduction is 50%, roll speed 35 times/minute, oxidizing annealing, 750 ℃ of insulations of annealing temperature 2 hours, air cooling;
5. the 4th internal surface of bloom that passage is got off adds paraffin, and outer surface of tube blank molybdenumdisulphide lithium soap grease lubricant is rolled, the 5th passage rolling reduction is 48%, roll speed 35 times/minute, oxidizing annealing, 750 ℃ of insulations of annealing temperature 2 hours, air cooling;
6. the 5th internal surface of bloom that passage is got off adds paraffin, and outer surface of tube blank molybdenumdisulphide lithium soap grease lubricant is rolled, the 6th passage rolling reduction is 45%, roll speed 40 times/minute, oxidizing annealing, 750 ℃ of insulations of annealing temperature 2 hours, air cooling;
7. the 6th internal surface of bloom that passage is got off adds paraffin, and outer surface of tube blank molybdenumdisulphide lithium soap grease lubricant is rolled, the 7th passage rolling reduction is 40%, roll speed 40 times/minute, oxidizing annealing, 750 ℃ of insulations of annealing temperature 2 hours are repaiied behind the air cooling and are scraped defective.
8. the 7th internal surface of bloom that passage is got off adds paraffin, and outer surface of tube blank molybdenumdisulphide lithium soap grease lubricant is rolled, the 8th passage mill product
Deflection is 30%, roll speed 35 times/minute, oxidizing annealing, 750 ℃ of insulations of annealing temperature 2 hours, air cooling, alkali cleaning, pickling, washing.
9. finished product
750 ℃ of oxidizing annealings, 2 hours, air cooling, its performance actual measurement of sampling analysis is Rm995MPa, Rp0.2 910MPa, A 17.2%;
10. finished product
800 ℃ of vacuum annealings are incubated 1.5 hours, furnace cooling, and its performance actual measurement of sampling analysis is Rm989MPa, Rp0.2 906MPa, A 16.1%.
Embodiment 6.
Concrete preparation process is as follows:
1. by the TC4 pipe
In cold rolling this titanium alloy pipe process, rolling pass is a passage when just going out finished product, at first pipe is carried out oxidizing annealing, and annealing temperature is 800 ℃ of insulations 2 hours, annealing back alkali cleaning, in pickling, oxide skin and defective are all washed off afterwards, and then washing, the pipe surfaces externally and internally adds lubricant, be rolled then, rolling reduction is 37.8%, and roll speed is 60 times/minute; Trimmed size is Φ 76mm * 6mm, and rolling intact finished product adopts oxidizing annealing, and the temperature of oxidizing annealing is 800 ℃ of insulations 2 hours; Finished product behind the oxidizing annealing then carries out alkali cleaning, pickling after the alkali cleaning, and washing afterwards obtains final product.
Claims (5)
1. titanium alloy TC 4 cold-rolled tube is characterized in that:
Alloy composition is by weight percentage: Al (5.5～6.75) %, V (3.5～4.5) %, Fe≤0.1%, C≤0.1%, N≤0.03%, H≤0.015%, O≤0.15%, Ti surplus.
2. the preparation method of the described titanium alloy TC 4 cold-rolled tube of claim 1 is characterized in that:
Alloy raw material consists of by weight percentage: Al (5.5～6.75) %, V (3.5～4.5) %, Ti surplus; Pipe that above-mentioned raw materials is processed into and semifinished tube according to a conventional method, and Fe≤0.1% in the control titanium alloy TC 4, C≤0.1%, N≤0.03%, H≤0.015%, O≤0.15% carries out cold rolling forming then; Its TC4 cold rolled tube specification is
And external diameter must be greater than 2 with the ratio of wall thickness;
When cold rolling this titanium alloy pipe, pipe or semifinished tube surfaces externally and internally add lubricant, be rolled then, whenever must adopt oxidizing annealing after rolling a passage, the oxidizing annealing temperature is 600～900 ℃ of insulations 1～3 hour, each passage rolling reduction is 15%～65%, and roll speed is 20～90 times/minute;
When rolling first or second passage, the monolateral 0～0.8mm of hinge in carrying out; Must alkali cleaning before rolling last 1 or 2 passage and pickling or pickling after washing oxide skin and defective are all pared off, be rolled again, rolling is the 1-16 passage, finished product after rolling the finishing adopts oxidizing annealing or vacuum annealing, and the annealing temperature of oxidizing annealing is 600～900 ℃ of insulations 1～3 hour; The annealing temperature of vacuum annealing is 600～900 ℃ of insulations 1～3 hour, and the finished product after the annealing then will carry out alkali cleaning and pickling or pickling after washing again, obtains final product.
3. according to the preparation method of claim 2 titanium alloy TC 4 cold-rolled tube, it is characterized in that: described lubricant is paraffin, molybdenumdisulphide or molybdenumdisulphide lithium soap grease.
4. according to the preparation method of claim 2 titanium alloy TC 4 cold-rolled tube, it is characterized in that: described rolling pass number is 2-9.
5. according to the preparation method of claim 2 titanium alloy TC 4 cold-rolled tube, it is characterized in that:
In cold rolling this titanium alloy pipe process, rolling pass is that a passage is when just going out finished product, at first pipe or semifinished tube are carried out oxidizing annealing, annealing temperature is 600～900 ℃ of insulations 1～3 hour, annealing back alkali cleaning and pickling or pickling after washing all pare off oxide skin and defective, and pipe or semifinished tube surfaces externally and internally add lubricant, are rolled then, rolling reduction is 15%～65%, and roll speed is 20～90 times/minute; When rolling, the monolateral 0～0.8mm of hinge in carrying out; Finished product after rolling the finishing adopts oxidizing annealing or vacuum annealing, and the annealing temperature of oxidizing annealing is 600～900 ℃ of insulations 1～3 hour; The annealing temperature of vacuum annealing is 600～900 ℃ of insulations 1～3 hour; Finished product after the annealing then will carry out alkali cleaning and pickling or pickling after washing again, obtains final product.
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| US5980655A (en) * | 1997-04-10 | 1999-11-09 | Oremet-Wah Chang | Titanium-aluminum-vanadium alloys and products made therefrom |
| WO2003104506A1 (en) * | 2002-06-11 | 2003-12-18 | 住友金属工業株式会社 | β-TYPE TITANIUM ALLOY AND PROCESS FOR PRODUCING THE SAME |
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