CN104561652A - Titanium alloy (dfgx-2#) rolled tube and preparation method thereof - Google Patents
Titanium alloy (dfgx-2#) rolled tube and preparation method thereof Download PDFInfo
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Abstract
The invention relates to titanium alloy, specifically to a titanium alloy (dfgx-2#) finished tube and its preparation method. Alloy composition of the titanium alloy (dfgx-2#) finished tube comprises, by weight, the balance Ti, 2-4% of Al, 2-4% of Sn, 2-4% of Cr, 13-17% of V, Fe being less than or equal to 0.1%, C being less than or equal to 0.05%, N being less than or equal to 0.04%, H being less than or equal to 0.0125% and O being less than or equal to 0.13%. There are four processing and preparation methods of the titanium alloy tube No. dfgx-2: a first method comprises cross piercing, acquisition of a tube billet, finishing of the tube billet and cold rolling; a second method comprises cross piercing, acquisition of a tube billet, finishing of the tube billet and warm/hot rolling; a third method comprises extrusion processing, acquisition of a tube billet, finishing of the tube billet and cold rolling; and a fourth method comprises extrusion processing, acquisition of a tube billet, finishing of the tube billet and warm/hot rolling. According to properties of the titanium alloy No. dfgx-2 tube, tensile strength is 800-1300 MPa, ductility is 8-25%, and a metallographic structure is uniform. Two metallographic structures of stress annealing and perfect recrystallization annealing are eliminated.
Description
Technical field
The present invention relates to titanium alloy tube and preparation thereof, specifically a kind of dfgx-2# rolled tube and preparation method thereof.
Background technology
Along with the development of titanium alloy, more and more demand high strength, high tenacity, high temperature resistant and corrosion resistant titanium alloy, especially titanium alloy pipe demand gets more and more, and the difficulty of processing of titanium alloy pipe is increasing, titanium alloy dfgx-2# tubing major applications in oil field, the industry such as Nuclear power plants, chemical industry, and present titanium alloy dfgx-2# tubing be all the weldering of sheet material volume usually, bar draw hole, cut with scissors in outer car after cross piercing, domestic at present do not have one can roll out titanium alloy (dfgx-2#) tubing.
Summary of the invention
The object of the present invention is to provide a kind of titanium alloy (dfgx-2#) pipe being suitable for modern market demand, the dfgx-2# tubing intensity of this method rolling is high, good toughness, high temperature resistant and corrosion-resistant, 800-1300MPa is reached, unit elongation 8-25% by the tensile strength (Rm) that the titanium alloy dfgx-2# of aforesaid method processing manages in its performance.
For achieving the above object, the technical solution used in the present invention is:
A kind of titanium alloy (dfgx-2#) rolled tube, alloy composition is by weight percentage: Al (2-4) %, Sn (2-4) %, Cr (2-4) %, V (13-17), Fe≤0.1%, C≤0.05%, N≤0.04%, H≤0.0125%, O≤0.12%;
The preparation method of described titanium alloy (dfgx-2#) rolled tube:
This titanium alloy tube (dfgx-2#) preparation for processing has four kinds, and the first carries out cross piercing, obtains pipe, and finishing pipe, carries out cold rolling; The second carries out cross piercing, obtains pipe, and finishing pipe, carries out temperature (heat) rolling; The third carries out extrusion processing, obtains pipe, and finishing pipe, carries out cold rolling; 4th kind is carry out extrusion processing, obtains pipe, and finishing pipe, carries out temperature (heat) rolling; When this titanium alloy pipe of rolling, pipe and semifinished tube surfaces externally and internally add lubricant, are then rolled, often roll the blank after a passage and will carry out pickling, pickling after washing, then pipe will carry out oxidizing annealing, and the pipe of oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing again; Interior strand is not carried out when rolling passage goes out finished product, when rolling second passage goes out finished product, twist in the laggard row of rolling first passage, go out finished product in a rolling 3-10 passage, when rolling first or second passage, carry out the monolateral 0-0.8mm of interior hinge, the oxide skin of blank before each passage and defect are all pared off, rolling pass 1-10 passage goes out finished product, and finished product adopts vacuum annealing or oxidizing annealing, finished product after vacuum annealing then will carry out pickling, pickling after washing again, obtains final product; Finished product after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing again, obtains final product.
This titanium alloy (dfgx-2#) rolled tube performance is good, and its metallographic structure is even, and tube surfaces quality is good.During temperature (heat) tube rolling base, online or off-line heating pipe is rolled, and on-line heating temperature is 400-1200 DEG C of insulation 0-90 minute, and every time deflection is 15%-85%, and roll speed (20-90) beat/min, rolling goes out finished product 1-10 time.When this titanium alloy pipe of rolling, pipe or semifinished tube surfaces externally and internally add lubricant, then be rolled, often roll the blank after a passage and will carry out pickling, pickling after washing, then pipe adopts oxidizing annealing, and oxidizing annealing temperature is 500-900 DEG C of insulation 0.5-3 hour, and the pipe after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing, each passes deflection is 15%-85%, and roll speed is 20-90 beat/min; Interior strand is not carried out when rolling passage goes out finished product, when rolling second passage goes out finished product, twist in the laggard row of rolling first passage, go out finished product in a rolling 3-10 passage, when rolling first or second passage, carry out the monolateral 0-0.8mm of interior hinge, oxide skin and defect are all pared off, then be rolled, rolling is 1-10 passage, finished product after rolling completes adopts oxidizing annealing or vacuum annealing, and the annealing temperature of oxidizing annealing is 500-900 DEG C of insulation 0.5-3 hour; The annealing temperature of vacuum annealing is 500-900 DEG C of insulation 0.5-3 hour, and the finished product after vacuum annealing then will carry out pickling, pickling after washing again, obtains final product; Finished product after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing again, obtains final product.
The present invention compared with prior art, has following beneficial effect:
1. intensity is high, corrosion-resistant: titanium alloy dfgx-2# rolled tube intensity (Rm) (800-1300MPa) of the present invention 180-680MPa higher than now conventional titanium alloy T A18 pipe (620MPa), erosion resistance is also managed considerably beyond TA18.
2. reduce costs, shorten the production cycle: after the rolling of existing titanium alloy pipe production process per pass, all vacuum annealing will be carried out, and after titanium alloy dfgx-2# drawn and rolled tube production technique per pass of the present invention rolling, all carry out being oxidized (antivacuum) annealing, so both reduce power consumption cost and also shorten the production cycle.
3. yield rate is high, quality is good, performance is excellent: it is high that dfgx-2# rolled tube of the present invention draws hole pipe yield rate than bar, dfgx-2# rolled tube utilizes perforation pipe or extrusion tube blank to be rolled, loss is little, yield rate is high, hole pipe drawn by bar then needs to draw out much to consider waste product to be worth doing, loss is large, yield rate is low, the quality and performance of hole pipe just bar drawn by bar, and dfgx-2# rolled tube is on the basis of bar, carry out deep processing, then bar draws the quality of hole pipe, performance far away from quality, the performance of dfgx-2# rolled tube.
4. metal inside is organized: the present invention adopts dfgx-2# rolled tube, metal inside tissue is more than what cut with scissors in the outer car of perforation pipe that pipe will be good, dfgx-2# rolled tube is in the course of processing, carry out oxidizing annealing, crystal grain can be made to reply original state, longitudinal to pipe during rolling, radial balanced power, makes pipe intrinsic silicon grain structure fine and close; And outside pipe of boring a hole in car hinge pipe do not make crystal grain reply original state, and only have and its grain structure pulled out, so strand pipe metal structure does not have dfgx-2# rolling to run well in the outer car of perforation pipe.
5. long service life: the congenital dense structure of dfgx-2# rolling seamless tube of the present invention, sheet material welded tube then commissure structural state and matrix inconsistent, easily cause fatigability intergranular cracking, so have dfgx-2# rolling seamless tube than sheet material welded tube long service life.
6. surface quality is good: what titanium alloy dfgx-2# of the present invention rolled tube will be good than the pipe surfaces externally and internally quality of hot extrusion is many, and titanium alloy dfgx-2# rolled tube surfaces externally and internally light, and the defects such as non-wrinkle, cut, the surfaces externally and internally of extruding is then brightless, has cut.
7. domestic blank has been replenished in titanium alloy dfgx-2# rolled tube.
Embodiment
The present invention just can obtain new titanium alloy dfgx-2# rolled tube by the formula of uniqueness, working method and rolling technology, below by embodiment in detail the present invention is described in detail.
Adopt oxidizing annealing rolling: step is carried out routinely, first raw material titanium sponge is used, vananum, carry out (Al (2-4) % by weight percentage for preparing burden, Sn (2-4) %, Cr (2-4) %, V (13-17) %, Ti surplus, raw material is mixed) (concrete raw material of the present invention consists of: Al3%, Sn3%, Cr3%, V15%, Ti surplus), extruding electrode, grid for welding, shove charge melting ingot casting, strip off the skin sampling analysis, bar (excellent base) is forged with ingot casting, the blanking of bar car light, bore a hole into pipe with optical wand or draw hole with optical wand and be squeezed into pipe, again by pipe tack, split rolling method becomes pipe, degreasing, oxidizing annealing, interior hinge, rolling, repair and scrape, alkali cleaning, pickling, washing, finish rolling finished product pipe, tack, annealing, sampling analysis, flaw detection, hydraulic pressure detects, scale blanking.
Alkaline wash in following embodiment, pickle solution weight proportion are
Alkaline wash: [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. the dfgx-2# pipe obtained by cross piercing
88mm × 8.5mm × Lmm(length), internal surface of bloom and plug (metal material, solid pole, bar gauge lattice depend on pipe or production tube internal diameter specification) add oildag, carry out temperature (heat) rolling, on-line heating temperature is 750 DEG C, first passage rolling reduction is 30%, roll speed 35 beats/min, and carrying out oxidizing annealing temperature after the pipe air cooling shut out is 600 DEG C of insulations 2 hours, pipe after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing, checks defect and repair to scrape defect.
2. the pipe monolateral Nei Jiao 50 road (0.5mm) that gets off of first, internal surface and plug add oildag, carry out temperature (heat) rolling, on-line heating temperature is 700 DEG C, second passes deflection is 35%, roll speed 30 beats/min, and carrying out oxidizing annealing temperature after the pipe air cooling shut out is 600 DEG C of insulations 1.5 hours, pipe after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing, checks defect and repair to scrape defect.
3. the pipe that gets off of second, internal surface and plug add oildag, carry out temperature (heat) rolling, on-line heating temperature is 550 DEG C, 3rd passes deflection is 35%, roll speed 30 beats/min, and carrying out oxidizing annealing temperature after the pipe air cooling shut out is 550 DEG C of insulations 1.5 hours, pipe after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing, checks defect and repair to scrape defect.
4. the pipe that gets off of the 3rd road, internal surface and plug add oildag, and carry out temperature (heat) rolling, on-line heating temperature is 650 DEG C, and the 4th passes deflection is 30%, and roll speed 30 beats/min, goes out finished product after air cooling; Finished products has the following two kinds mode.
5. the first finished products:
40mm × 4.5mm × Lmm(length) oxidizing annealing 650 DEG C, 2 hours, air cooling, the finished product after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing again, obtains final product; The actual measurement of its performance of sampling analysis is Rm950MPa, Rp0.2830MPa, A16%.
6. the second finished products:
40mm × 4.5mm × Lmm(length) vacuum annealing 750 DEG C, be incubated 2 hours, furnace cooling, the finished product after vacuum annealing then will carry out pickling, pickling after washing again, obtains final product; The actual measurement of its performance of sampling analysis is Rm930MPa, Rp0.2810MPa, A17%.
Embodiment 2.
Concrete preparation process is as follows:
1. the dfgx-2# pipe obtained by cross piercing
300mm × 35mm × Lmm(length), internal surface of bloom and plug (metal material, solid pole, bar gauge lattice depend on pipe or production tube internal diameter specification) add oildag, carry out temperature (heat) rolling, on-line heating temperature is 1200 DEG C, first passage rolling reduction is 45%, roll speed 40 beats/min, carrying out oxidizing annealing temperature after the pipe air cooling shut out is 900 DEG C of insulations 3 hours, pipe after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing, checks defect and repair to scrape defect.
2. pipe monolateral Nei Jiao 50 road that gets off of first, internal surface and plug add oildag, carry out temperature (heat) rolling, on-line heating temperature is 1200 DEG C, second passes deflection is 40%, roll speed 35 beats/min, and carrying out oxidizing annealing temperature after the pipe air cooling shut out is 800 DEG C of insulations 3 hours, pipe after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing, checks defect and repair to scrape defect.
3. the pipe that gets off of second, internal surface and plug add oildag, carry out temperature (heat) rolling, on-line heating temperature is 1100 DEG C, 3rd passes deflection is 35%, roll speed 30 beats/min, and carrying out oxidizing annealing temperature after the pipe air cooling shut out is 800 DEG C of insulations 2.5 hours, pipe after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing, checks defect and repair to scrape defect.
4. the pipe that gets off of the 3rd road, internal surface and plug add oildag, and carry out temperature (heat) rolling, on-line heating temperature is 900 DEG C, and the 4th passes deflection is 30%, and roll speed 30 beats/min, goes out finished product after air cooling; Finished products has the following two kinds mode.
5. the first finished products:
219mm × 18mm × Lmm(length) oxidizing annealing 650 DEG C, 2 hours, air cooling, the finished product after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing again, obtains final product; The actual measurement of its performance of sampling analysis is Rm900MPa, Rp0.2780MPa, A18.0%.
6. the second finished products:
219mm × 18mm × Lmm(length) vacuum annealing 750 DEG C, be incubated 2 hours, furnace cooling, the finished product after vacuum annealing then will carry out pickling, pickling after washing again, obtains final product; The actual measurement of its performance of sampling analysis is Rm880MPa, Rp0.2760MPa, A19%.
Embodiment 3.
Concrete preparation process is as follows:
1. the dfgx-2# pipe obtained by cross piercing
125mm × 13mm × Lmm(length), pipe surfaces externally and internally adds paraffin, grease based on molybdenum disulfide lithium lubricant respectively, carry out cold rolling, first passage rolling reduction is 15%, roll speed 20 beats/min, and the pipe shut out carries out pickling, pickling after washing, monolateral Nei Jiao 50 road, carrying out oxidizing annealing temperature is 900 DEG C of insulations 2.5 hours, and the pipe after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing, checks defect and repair to scrape defect.
2. the pipe surfaces externally and internally that first gets off adds paraffin, grease based on molybdenum disulfide lithium lubricant respectively, carry out cold rolling, second passes deflection is 30%, roll speed 30 beats/min, and the pipe shut out carries out pickling, pickling after washing, roll rear two ends and respectively ftracture 5 centimeters, intermediate surface quality is better, cuts termination, and carrying out oxidizing annealing temperature is 850 DEG C of insulations 2.5 hours, pipe after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing, repaiies and scrape defect after air cooling.
3. the pipe surfaces externally and internally that second passage is got off adds paraffin, grease based on molybdenum disulfide lithium lubricant respectively, carry out cold rolling, 3rd passes deflection is 35%, roll speed 30 beats/min, the pipe shut out carries out pickling, pickling after washing, carrying out oxidizing annealing temperature is 800 DEG C of insulations 2.5 hours, and the pipe after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing, repaiies and scrape defect after air cooling.
4. the pipe surfaces externally and internally that the 3rd passage is got off adds paraffin, grease based on molybdenum disulfide lithium lubricant respectively, and be rolled, the 4th passes deflection is 20%, mill product
88.9 × 6.45, roll speed 35 beats/min, shuts out finished product; Finished products has the following two kinds mode.
5. the first finished products:
88.9mm × 6.45mm × Lmm(length) oxidizing annealing 650 DEG C, 2.5 hours, air cooling, the finished product after solid solution aging then will carry out alkali cleaning, alkali cleaning after washing again, obtains final product; The actual measurement of its performance of sampling analysis is Rm1150MPa, Rp0.21050MPa, A14%.
6. the second finished products:
88.9mm × 6.45mm × Lmm(length) vacuum annealing 650 DEG C, be incubated 2.5 hours, furnace cooling, (solid solution 700-960 DEG C, 20-90 second, air cooling or water-cooled, actual effect 470-700 DEG C, 3-8 hour, air cooling after solid solution aging.Finished product after solid solution aging then will carry out alkali cleaning, alkali cleaning after washing again, obtains final product; The actual measurement of its performance of sampling analysis is Rm1050MPa, Rp0.2950MPa, A13%, and Rockwell hardness (HRC) is 39.
Embodiment 4.
Concrete preparation process is as follows:
1. the dfgx-2# pipe obtained by extruding
88mm × 8.5mm × Lmm(length), internal surface of bloom and plug (metal material, solid pole, bar gauge lattice depend on pipe or production tube internal diameter specification) add oildag, carry out temperature (heat) rolling, on-line heating temperature is 700 DEG C, first passage rolling reduction is 30%, roll speed 35 beats/min, and carrying out oxidizing annealing temperature after the pipe air cooling shut out is 600 DEG C of insulations 2 hours, pipe after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing, checks defect and repair to scrape defect.
2. pipe monolateral Nei Jiao 50 road that gets off of first, internal surface and plug add oildag, carry out temperature (heat) rolling, on-line heating temperature is 650 DEG C, second passes deflection is 25%, roll speed 30 beats/min, and carrying out oxidizing annealing temperature after the pipe air cooling shut out is 600 DEG C of insulations 1.5 hours, pipe after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing, checks defect and repair to scrape defect.
3. the pipe that gets off of second, internal surface and plug add oildag, carry out temperature (heat) rolling, on-line heating temperature is 600 DEG C, 3rd passes deflection is 30%, roll speed 30 beats/min, and carrying out oxidizing annealing temperature after the pipe air cooling shut out is 550 DEG C of insulations 1.5 hours, pipe after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing, checks defect and repair to scrape defect.
4. the pipe that gets off of the 3rd road, internal surface and plug add oildag, and carry out temperature (heat) rolling, on-line heating temperature is 550 DEG C, and the 4th passes deflection is 25%, and roll speed 30 beats/min goes out finished product after the pipe air cooling shut out; Finished products has the following two kinds mode.
5. the first finished products:
25mm × 3mm × Lmm(length) oxidizing annealing 650 DEG C, 2 hours, air cooling, the finished product after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing again, obtains final product; The actual measurement of its performance of sampling analysis is Rm970MPa, Rp0.2800MPa, A15%.
6. the second finished products:
25mm × 3mm × Lmm(length) vacuum annealing 750 DEG C, be incubated 2 hours, furnace cooling, the finished product after vacuum annealing then will carry out pickling, pickling after washing again, obtains final product; The actual measurement of its performance of sampling analysis is Rm950MPa, Rp0.2780MPa, A16%.
Embodiment 5.
Concrete preparation process is as follows:
1. the dfgx-2# pipe obtained by extruding
300mm × 35mm × Lmm(length), internal surface of bloom and plug (metal material, solid pole, bar gauge lattice depend on pipe or production tube internal diameter specification) add oildag, carry out temperature (heat) rolling, on-line heating temperature is 1100 DEG C, first passage rolling reduction is 35%, roll speed 35 beats/min, carrying out oxidizing annealing temperature after the pipe air cooling shut out is 900 DEG C of insulations 3 hours, pipe after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing, checks defect and repair to scrape defect;
2. pipe monolateral Nei Jiao 50 road that gets off of first, internal surface and plug add oildag, carry out temperature (heat) rolling, on-line heating temperature is 1000 DEG C, second passes deflection is 40%, roll speed 35 beats/min, and carrying out oxidizing annealing temperature after the pipe air cooling shut out is 800 DEG C of insulations 3 hours, pipe after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing, checks defect and repair to scrape defect.
3. the pipe that gets off of second, internal surface and plug add oildag, carry out temperature (heat) rolling, on-line heating temperature is 900 DEG C, 3rd passes deflection is 40%, roll speed 35 beats/min, and carrying out oxidizing annealing temperature after air cooling is 800 DEG C of insulations 2.5 hours, pipe after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing, checks defect and repair to scrape defect.
4. the pipe that gets off of the 3rd road, internal surface and plug add oildag, and carry out temperature (heat) rolling, on-line heating temperature is 800 DEG C, and the 4th passes deflection is 35%, and roll speed 30 beats/min, goes out finished product after air cooling; Finished products has the following two kinds mode.
5. the first finished products:
219mm × 18mm × Lmm(length) oxidizing annealing 650 DEG C, 2 hours, air cooling, the finished product after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing again, obtains final product; The actual measurement of its performance of sampling analysis is Rm950MPa, Rp0.2810MPa, A16%.
6. the second finished products:
219mm × 18mm × Lmm(length) vacuum annealing 750 DEG C, be incubated 2 hours, furnace cooling, the finished product after vacuum annealing then will carry out pickling, pickling after washing again, obtains final product; The actual measurement of its performance of sampling analysis is Rm920MPa, Rp0.2800MPa, A17%.
Embodiment 6.
Concrete preparation process is as follows:
1. the dfgx-2# pipe obtained by extruding
125mm × 13mm × Lmm(length), pipe surfaces externally and internally adds paraffin, grease based on molybdenum disulfide lithium lubricant respectively, carry out cold rolling, first passage rolling reduction is 30%, roll speed 30 beats/min, and the pipe shut out carries out pickling, pickling after washing, monolateral Nei Jiao 50 road, carrying out oxidizing annealing temperature is 900 DEG C of insulations 2.5 hours, and the pipe after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing, checks defect and repair to scrape defect.
2. the pipe surfaces externally and internally that first gets off adds paraffin, grease based on molybdenum disulfide lithium lubricant respectively, carry out cold rolling, second passes deflection is 35%, roll speed 35 beats/min, and the pipe shut out carries out pickling, pickling after washing, roll rear two ends and respectively ftracture 3 centimeters, intermediate surface quality is better, cuts termination, and carrying out oxidizing annealing temperature is 850 DEG C of insulations 2.5 hours, pipe after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing, repaiies and scrapes defect.
3. the pipe surfaces externally and internally that second passage is got off adds paraffin, grease based on molybdenum disulfide lithium lubricant respectively, carry out cold rolling, 3rd passes deflection is 35%, roll speed 35 beats/min, the pipe shut out carries out pickling, pickling after washing, carrying out oxidizing annealing temperature is 800 DEG C of insulations 2.5 hours, and the pipe after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing, repaiies and scrapes defect.
4. the pipe surfaces externally and internally that the 3rd passage is got off adds paraffin, grease based on molybdenum disulfide lithium lubricant respectively, and be rolled, the 4th passes deflection is 30%, mill product
88.9 × 6.45, roll speed 35 beats/min, shuts out finished product; Finished products has the following two kinds mode.
5. the first finished products:
88.9mm × 6.45mm × Lmm(length) oxidizing annealing 650 DEG C, 2.5 hours, air cooling, (solid solution 700-960 DEG C, 20-90 second, air cooling or water-cooled, actual effect 470-700 DEG C, 3-8 hour, air cooling after solid solution aging.Finished product after solid solution aging then will carry out alkali cleaning, alkali cleaning after washing again, obtains final product; The actual measurement of its performance of sampling analysis is Rm1150MPa, Rp0.21030MPa, A3%.
6. the second finished products:
88.9mm × 6.45mm × Lmm(length) vacuum annealing 650 DEG C, be incubated 2.5 hours, furnace cooling, (solid solution 700-960 DEG C, 20-90 second, air cooling or water-cooled, actual effect 470-700 DEG C, 3-8 hour, air cooling after solid solution aging.Finished product after solid solution aging then will carry out alkali cleaning, alkali cleaning after washing again, obtains final product; The actual measurement of its performance of sampling analysis is Rm1050MPa, Rp0.2950MPa, A14%.
Claims (7)
1. a titanium alloy dfgx-2# rolled tube, is characterized in that:
Alloy composition is by weight percentage: Ti surplus, Al (2-4) %, Sn (2-4) %, Cr (2-4) %, V (13-17) %, Fe≤0.1%, C≤0.05%, N≤0.04%, H≤0.0125%, O≤0.13%.
2. a preparation method for titanium alloy dfgx-2# rolled tube described in claim 1, is characterized in that:
This titanium alloy tube (dfgx-2#) preparation for processing chooses one of following four kinds, and the first carries out cross piercing, obtains pipe, and finishing pipe, carries out cold rolling; The second carries out cross piercing, obtains pipe, and finishing pipe, carries out temperature (heat) rolling; The third carries out extrusion processing, obtains pipe, and finishing pipe, carries out cold rolling; 4th kind is carry out extrusion processing, obtains pipe, and finishing pipe, carries out temperature (heat) rolling;
When this titanium alloy pipe of rolling, pipe and semifinished tube surfaces externally and internally add lubricant, are then rolled, often roll the pipe after a passage and will carry out pickling, pickling after washing, then blank will carry out oxidizing annealing, and the pipe after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing again; Interior strand is not carried out when rolling passage goes out finished product; When rolling second passage goes out finished product, twist in the laggard row of rolling first passage; Go out finished product in a rolling 3-10 passage, carry out interior hinge when rolling first or second passage; The monolateral 0-1.5mm of interior hinge, all pares off the oxide skin of blank before each passage and defect;
Adopt oxidizing annealing or vacuum annealing after mill product, the finished product of oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing again; The finished product of vacuum annealing then will carry out pickling, pickling after washing; This titanium alloy (dfgx-2#) rolled tube performance is good, and its metallographic structure is even, and tube surfaces quality is good.
3., according to the preparation method of titanium alloy rolled tube described in claim 2, it is characterized in that:
During temperature (heat) tube rolling base, online or off-line heating pipe is rolled, and online or off-line Heating temperature is 400-1300 DEG C of insulation 0-90 minute.
4., according to the preparation method of titanium alloy rolled tube described in Claims 2 or 3, it is characterized in that:
Tensile strength (Rm) in titanium alloy (dfgx-2#) the rolled tube performance prepared by aforesaid method can reach (800-1300) MPa after normal heat process and solid solution aging, unit elongation is at (8-25) %, Rockwell hardness (HRC) is 30-60, in the two states that stress relieving and perfect recrystallization are annealed, its metallographic structure is even; This titanium alloy (dfgx-2#) product rolled tube surface quality is good, surface-brightening, the defects such as its surperficial corrugationless.
5. according to the preparation method of titanium alloy rolled tube described in Claims 2 or 3, it is characterized in that: rolled tube specification is one of the following;
Pipe external diameter
3-
360mm × wall thickness 0.5-35mm (but external diameter must be greater than 2 with the ratio of wall thickness) × length 100-12000mm;
Square tube 3-360mm × 3-360mm × wall thickness 0.5-35mm (but each length of side must be greater than adjacent 2 wall thickness sums) × length 100-12000mm;
Special pipe, special pipe large head external diameter must be greater than small head external diameter, and wall thickness is sample, is the hollow body diminished gradually by major part to microcephaly, large head external diameter
10-
360mm × wall thickness 0.5-35mm (but external diameter must be greater than 2 with the ratio of wall thickness) × small head external diameter
3-
300mm × wall thickness 0.5-35mm (but external diameter must be greater than 2 with the ratio of wall thickness) × length 100-12000mm, special pipe large head external diameter must be greater than small head external diameter.
6. according to the preparation method of titanium alloy rolled tube described in Claims 2 or 3, it is characterized in that: described lubricant is paraffin, molybdenumdisulphide or grease based on molybdenum disulfide lithium, ROLLING OIL or machine oil.
7., according to the preparation method of titanium alloy rolled tube described in Claims 2 or 3, it is characterized in that:
In this titanium alloy pipe process of rolling, often roll the blank after a passage and will carry out pickling, pickling after washing, then pipe carries out oxidizing annealing, annealing temperature is 500-900 DEG C of insulation 0.5-3 hour, and the pipe after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing, the defect on pipe is all pared off, pipe or semifinished tube surfaces externally and internally add lubricant, then be rolled, each pass deformation of rolling is 15%-85%, and roll speed is 20-90 beat/min; Finished product after rolling completes adopts oxidizing annealing or vacuum annealing, and the annealing temperature of oxidizing annealing is 500-900 DEG C of insulation 0.5-3 hour; The annealing temperature of vacuum annealing is 500-900 DEG C of insulation 0.5-3 hour; The pipe finished product of vacuum annealing then will carry out pickling, pickling after washing again; Production tube after oxidizing annealing then will carry out alkali cleaning, alkali cleaning after washing.
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| CN201310473626.XA CN104561652A (en) | 2013-10-11 | 2013-10-11 | Titanium alloy (dfgx-2#) rolled tube and preparation method thereof |
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Cited By (1)
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| CN107556907A (en) * | 2017-09-11 | 2018-01-09 | 常熟市双羽铜业有限公司 | A kind of high-temperature titanium alloy pipe |
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