CN107649531B - A kind of processing method of titanium alloy large-calibre seamless thin-wall pipes - Google Patents
A kind of processing method of titanium alloy large-calibre seamless thin-wall pipes Download PDFInfo
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- CN107649531B CN107649531B CN201710951657.XA CN201710951657A CN107649531B CN 107649531 B CN107649531 B CN 107649531B CN 201710951657 A CN201710951657 A CN 201710951657A CN 107649531 B CN107649531 B CN 107649531B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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Abstract
The invention discloses a kind of processing methods of titanium alloy large-calibre seamless thin-wall pipes.Bar stock is made in cogging forging after titan alloy casting ingot heating and thermal insulation by the processing method, bar stock is machined to obtain hollow hollow billet, radial forging is carried out after hollow hollow billet heating and obtains pipe, obtains the titanium alloy pipe that 133~219mm of outer diameter Φ, 6~8.5mm of wall thickness, length are greater than 3000mm through turning after annealing.Titan alloy casting ingot can be processed into diameter greater than 120mm by the method for the present invention, the tubing of 6~8.5mm of wall thickness, and tubing room-temperature mechanical property is good；Compared with traditional extrusion rolling processing method, the method for the present invention is simple, process is short, and obtained tube surfaces are high-quality, dimensional accuracy is high, uniform wall thickness；This method production cost is low, and obtained titanium alloy pipe can be used for the fields such as naval vessel, petroleum, chemical industry, ocean engineering, has filled up the processing blank of domestic titanium alloy large-calibre seamless thin-wall pipes.
Description
Technical field
The invention belongs to materials processing technology fields, and in particular to the processing side of large-bore titanium alloy seamless thin wall tubing
Method.
Background technique
Titanium alloy has many advantages, such as that density is small, specific strength is high, corrosion-resistant, nonmagnetic, Aeronautics and Astronautics, chemical industry, weapons,
The fields such as naval vessel, automobile, building, medical treatment have broad application prospects, and are known as the metal material of 21 century, there is " space
The good reputation of metal " " marine metal " and " third metal ".Therefore the titanium alloys such as TA16, TA18, TA10, TC4 are processed to various
The tubing of specification is applied to the fields such as aviation, chemical industry, naval vessel.
Since titanium alloy has the characteristics that high-intensitive, resistance of deformation is big, difficult deformation, shapes that difficulty is very big, and tubing is ground
System and processing technology difficulty are larger.At abroad, the titanium alloy pipe development of the country such as Russia, U.S. and mating application technology are non-
Often mature, titanium alloy heavy caliber pipe has certain application in fields such as aviation, naval vessels.
In recent years, with the increasingly increase of the fields such as China naval vessel, chemical industry, ocean engineering titanium demand, heavy caliber titanium is closed
The demand of golden tubing is also more and more.On the one hand the processing of titanium alloy large-calibre seamless tubing depends on perfect production and sets
It is standby, such as 3150 tons of extruders, Mannesmann piercing mills, the titanium alloy seamless tubular goods that bore is greater than 120mm is produced, large-tonnage is needed
Extruder, equipment investment are huge；On the other hand processing method is depended on, traditional diamond-making technique is extrusion tube blank+cold rolling or oblique milling
Perforation pipe+cold rolling, need to be equipped with the compression tools such as extrusion cylinder, pressure ram, dummy block and formed punch, needle stand, guide passage when producing tubing
Equal spare parts, processing technology complexity, long flow path, production efficiency is low, manufacturing cost is high, lumber recovery is low, and pipe diameter is smaller.
The method of the existing large-caliber thin-walled tubing of machining titanium alloy has two classes, and one kind is to use plate, passes through veneer reeling machine or use
Hydraulic press compression molding, is then welded into round tube, and by set round, aligning, production has seam welded tube；Another kind of is using major diameter
Hollow thick-wall seamless material Boring (or being machined using ultra-large type tube rolling).
Such as patent CN1038944441 is disclosed and is produced titanium alloy pipe using forging pipe mode, but its outer diameter only has Φ 90
~Φ 150mm, and wall thickness is thicker, reaches 10~30mm；Patent CN101972794 and CN105568195 disclose using
The process route of " forging-forging stick drilling-cold rolling ", the titanium in bar centre is turned into bits by processing through-hole on forging stick
Material is not drawn off completely, and stock utilization is low, and subsequent still using the method for traditional cold rolling, and the process-cycle is long；Specially
Sharp CN104831120, CN101190444 and CN104174807, which are disclosed, produces titanium alloy using conventional extruded+rolling method
Heavy caliber pipe；It is then the Ti-B19 titanium alloy tube for preparing heavy caliber wall thickness and being greater than 100mm disclosed in patent CN106425317
Material；Patent CN106493187, which is disclosed, prepares diameter maximum up to the titanium alloy pipe of 520mm, but its using forging stick
The method that base+roll piercing+drawing reaming+machine adds；Patent CN105665468 is disclosed using spinning+rolling method, system
It is standby to obtain titanium pipe outer diameter there was only 50~120mm, wall thickness being 0.5~1.5mm；Patent CN101704035 disclose fast forging base+
The processing method of spinning obtains titanium pipe outer diameter there was only 50~100mm, wall thickness being 1~5mm.
Currently, the titanium alloy pipe outer diameter that China's titanium processing enterprise is able to produce is mostly in 114mm hereinafter, exist for diameter
The heavy caliber pipe of 120mm or more, the essentially thick-wall tube processed, for large-caliber thin-walled tubing, not yet shape
At reliable production technology system.
Summary of the invention
The purpose of the present invention is being difficult to obtain the deficiency of large-calibre seamless thin-wall pipes for existing processing technology, mention
Simple, high-efficient for a kind of process, available outer diameter is the heavy caliber titanium of Φ 130~Φ 219mm, 6~8.5mm of wall thickness
The processing method of alloy seamless tubing.
In order to achieve the object of the present invention, for the present inventor by a large number of experiments research and unremitting effort, final acquisition is as follows
Technical solution: specifically comprise the following steps:
The forging of step (1) bar stock: diameter of phi 622mm~Φ 820mm titan alloy casting ingot is subjected to multiple upsetting pull deformation, sufficiently
It is crushed coarse as-cast structure, it is ensured that the forging permeability and structural homogenity of bar stock obtain Φ 220mm~Φ 292mm bar stock；
Step (2) machining: the solid bar of 90~Φ of Φ 170mm is taken out from bar stock center by way of machining
Material, obtains the hollow hollow billet of titanium alloy, hollow hollow billet internal diameter differs 40~60mm with the solid bar diameter of taking-up；
Step (3) finish forge: radial forging will be carried out after the hollow hollow billet heating and thermal insulation of titanium alloy, obtains titanium alloy pipe；
Step (4) annealing；
Step (5) machining: the titanium alloy pipe after annealing carries out turnery processing, obtains 133~Φ of outer diameter Φ
219mm, 6~8.5mm of wall thickness, length are greater than the titanium alloy pipe of 3000mm.
It is further preferred that the processing method of titanium alloy large-calibre seamless thin-wall pipes of the present invention, the titanium alloy
The trade mark is TA10, TA22, TA16, TA24 or TC4.
It is further preferred that the processing method of titanium alloy large-calibre seamless thin-wall pipes of the present invention, the titanium alloy
Ingot casting is obtained by vacuum consumable arc process melting.
It is further preferred that the processing method of titanium alloy large-calibre seamless thin-wall pipes of the present invention, wherein step (1)
In, titan alloy casting ingot first carries out upsetting pull deformation in monophase field, then carries out pulling deformation in (alpha+beta) two-phase section, and wherein monophase field adds
Hot temperature is titanium alloy transformation temperature (Tβ) more than 60~150 DEG C, (alpha+beta) two-phase section heating temperature be transformation temperature below 5~80 DEG C.
It is further preferred that the processing method of titanium alloy large-calibre seamless thin-wall pipes of the present invention, wherein step (3)
In, heating temperature is 820~910 DEG C, 30~150min of soaking time, and final forging temperature is not less than 700 DEG C.
It is further preferred that the processing method of titanium alloy large-calibre seamless thin-wall pipes of the present invention, wherein step (3)
In, the radial dimension allowance control of pipe pipe straightness < 3mm/1000mm after ± 1mm, finish forge when forging.
It is further preferred that the processing method of titanium alloy large-calibre seamless thin-wall pipes of the present invention, wherein step (4)
In, 620~740 DEG C of annealing temperature, keep the temperature 1~3h after it is air-cooled.
It is further preferred that the processing method of titanium alloy large-calibre seamless thin-wall pipes of the present invention, in step (5),
Obtained titanium alloy pipe surfaces externally and internally roughness is not more than 3.2 μm.
It is further preferred that the material processing method of titanium alloy large-calibre seamless thin-wall tube of the present invention, the titanium alloy
Ingot casting is by the forging of step (1) bar stock and the processing of step (3) finish forge, total forging ratio >=4.
The titan alloy casting ingot carries out the forging of step (1) bar stock, the mistake after coating antioxidant defense coating after plane milling again
Journey is conventional technical means in the art.
The present invention compared with the existing technology, has the following technical effect that
(1) present invention adds the process of processing using forging+machining+finish forge+annealing+machine, can be by titan alloy casting ingot
Diameter is processed into greater than 120mm, the tubing of 6~8.5mm of wall thickness, and obtained titanium alloy pipe room-temperature mechanical property is good, symbol
Close technical requirements；
(2) bar stock is made in ingot casting after aximal deformation value, Duo Huoci repeatedly upsetting pull in the method for the present invention, and bar stock is machined
Hollow hollow billet is made, then obtains finished product tubing through finish forge, heat treatment, turning, straightening processing is not needed, without pickling and sandblasting
Tubing inner and outer surfaces are handled, manufacturing procedure is reduced, compared with traditional extrusion rolling processing method, simple process, process
It is short, and tube surfaces are high-quality, dimensional accuracy is high, uniform wall thickness；
(3) the method for the present invention, which breaches heavy caliber pipe production, needs the restriction of the equipment such as large-tonnage extruder, punch, raw
Production mode is flexible, high-efficient, and without spare parts such as compression tools and formed punch, needle stand such as extrusion cylinder, pressure ram, dummy blocks；
(4) bar for 90~Φ of diameter of phi 170mm that the method for the present invention step 3 is taken out, can be used for subsequent bar forging
Or rolling processing, and the titanium at bar stock center can only be turned into clast by conventional mechanical processing, can not directly be recycled, therefore energy
Raw material are enough efficiently used, stock utilization is high；
(5) it can avoid conventional extruded in such a way that routine forging+machining+finish forge combines in the method for the present invention
When pipe+cold rolling or roll piercing pipe+cold rolling process production titanium alloy pipe due to roll repeatedly cause tube surfaces pit,
The defects of wrinkle, micro-crack, the restriction of titanium alloy large-calibre seamless tubing cannot be produced by breaking through current conventional method still, be realized short
Process processing, improves production efficiency, reduces manufacturing cost.
(6) TA10 the and TA22 titanium alloy pipe for the plurality of specifications being prepared using the method for the present invention can be used for naval vessel,
The processing blank of domestic titanium alloy large-calibre seamless thin-wall pipes has been filled up in the fields such as petroleum, chemical industry, ocean engineering.
Specific embodiment
Specific embodiments of the present invention will be further explained below.
TA10 (nominal composition Ti-0.3Mo-0.8Ni) titanium alloy has good anti-crevice corrosion in the embodiment of the present invention
Performance, process plastic and welding performance are good, can be used for making heat exchanger, vacuum salt making facility etc.；TA22 (nominal composition Ti-
3Al-1Mo-1Zr-1Ni) titanium alloy is strong corrosion resistant Ti alloy during one kind is novel, and anti-crevice corrosion ability is excellent, can be used for manufacturing
The components such as dynamical system, sea pipeline system, heat exchanger, pressure hull, pump valve system.It is all existing disclosed titanium alloy
The trade mark.
TA10 the and TA22 titanium alloy heavy caliber pipe that plurality of specifications can be produced using the method for the present invention, can not only meet
Titanium demand is used in the fields such as China naval vessel, chemical industry, ocean engineering, can also be got rid of critical product and be relied on import, under one's control for a long time
Passive situation, while can promote titanium alloy large-calibre seamless tubing in the popularization and application in the fields such as petroleum, chlor-alkali, nuclear power, it is full
The processing blank of domestic titanium alloy large-calibre seamless thin-wall pipes is filled up in the urgent need of sufficient military project and civil field.
Diameter of phi 720mm titan alloy casting ingot is to be prepared by the following method to obtain in the embodiment of the present invention: being selected when melting
(TA10 ingot casting selects 0~2 grade to the lesser titanium sponge of granularity, 2~25.4mm of granularity；0 grade of TA22 ingot casting selection, granularity 2~
12.7mm), and intermediate alloy is added, the fusing point and titanium of intermediate alloy are close, can effectively improve the uniformity of ingot casting ingredient, prevent
It only generates and the metallurgical imperfections such as is segregated, is mingled with, while during alloy melting, constantly adjust melting electric current, make alloying element point
Cloth is uniformly and impurity content control is in expected horizontal, the excellent titan alloy casting ingot of acquisition metallurgical quality.
The process is conventional technical means in the art.
Embodiment 1
Prepare 133 × 6mm of TA10 titanium alloy Φ (diameter × wall thickness) tubing:
Step 1, TA10 titanium alloy Φ 720mm ingot casting is prepared using vacuum consumable electrode arc furnace melting 2 times, using quenching gold
It is 885~895 DEG C that phase method, which measures the ingot casting transformation temperature,；
Step 2, after carrying out plane milling processing to ingot casting, surface coats antioxidant defense coating, in gas furnace (temperature-controlled precision
± 15 DEG C) in heat and come out of the stove after keeping the temperature, the bar stock of 220 × 1200mm of Φ is forged into 10000 tons of quick forging machines later, specifically
For in 2~3 fire of monophase field forging, 2~3 fire of (alpha+beta) two-phase section forging, wherein monophase field heating temperature is 950~1000
DEG C, 820~880 DEG C of two-phase section heating temperature；
Step 3, the solid bar for taking out Φ 90mm from the bar stock center of Φ 220mm bar stock using cutter, obtains Ф
The hollow hollow billet of 220/ 140 × 1200mm of Ф；
Step 4, hollow hollow billet is placed in resistance furnace (temperature-controlled precision ± 10 DEG C) and is heated to 820~880 DEG C, heat preservation 0.5
2~3 fire of radial forging is carried out after~1.5h in precise forging machine, finish forge is at 144/ 110 × L of Ф of Ф >=3500mm pipe, forging
The radial dimension allowance control of pipe pipe straightness < 3mm/1000mm after ± 1mm, finish forge when making；
Step 5, pipe is heated to 620~680 DEG C to make annealing treatment in vacuum annealing furnace, keeps the temperature sky after 1~3h
It is cold, eliminate machining stress；
Step 6, pipe is carried out to turnery processing on deep hole drilling machine, be processed into (Φ 133 ± 0.4) × 6 × L mm at
Quality control material；
Wherein titan alloy casting ingot is handled by step 2 and step 4, total forging ratio >=4.
Embodiment 2
Prepare 159 × 7mm of TA10 titanium alloy Φ (diameter × wall thickness) tubing:
Step 1, TA10 titanium alloy Φ 720mm ingot casting is prepared using vacuum consumable electrode arc furnace melting 2 times, using quenching gold
It is 885~895 DEG C that phase method, which measures the ingot casting transformation temperature,；
Step 2, after carrying out plane milling processing to ingot casting, surface coats antioxidant defense coating, heats simultaneously in gas furnace
It comes out of the stove after heat preservation, is forged into the bar stock of 250 × 1200mm of Φ in 10000 tons of quick forging machines later, specially forge 2 in monophase field
~3 fire, 2~3 fire of (alpha+beta) two-phase section forging, wherein monophase field heating temperature is 950~1000 DEG C, two-phase section heating temperature
820~880 DEG C of degree；
Step 3, by the machined solid bar for taking out Φ 115mm from bar stock center of obtained bar stock, Ф is obtained
The hollow hollow billet of 250/ 165 × 1200mm of Ф；
Step 4, hollow hollow billet is placed in resistance furnace and is heated to 820~880 DEG C, kept the temperature after 0.5~1.5h in precise forging machine
2~3 fire of upper progress radial forging, finish forge is at 170/ 135 × L of Ф of Ф >=3500mm pipe, the radial ruler of pipe when forging
Very little allowance control pipe straightness < 3mm/1000mm after ± 1mm, finish forge；；
Step 5, pipe is heated to 620~680 DEG C to make annealing treatment in vacuum annealing furnace, keeps the temperature sky after 1~3h
It is cold, eliminate machining stress；
Step 6, pipe is carried out to turnery processing on deep hole drilling machine, be processed into (Φ 159 ± 0.4) × 7 × L mm at
Quality control material；
Wherein titan alloy casting ingot is handled by step 2 and step 4, total forging ratio >=4.
Embodiment 3
Prepare 190 × 8mm of TA10 titanium alloy Φ (diameter × wall thickness) tubing:
Step 1, TA10 titanium alloy Φ 720mm ingot casting is prepared using vacuum consumable electrode arc furnace melting 2 times, using quenching gold
It is 885~895 DEG C that phase method, which measures the ingot casting transformation temperature,；
Step 2, after carrying out plane milling processing to ingot casting, surface coats antioxidant defense coating, heats simultaneously in gas furnace
It comes out of the stove after heat preservation, is forged into the bar stock of 268 × 1200mm of Φ in 10000 tons of quick forging machines later, specially forge 2 in monophase field
~3 fire, 2~3 fire of (alpha+beta) two-phase section forging, wherein monophase field heating temperature is 950~1000 DEG C, two-phase section heating temperature
820~880 DEG C of degree；
Step 3, by the machined solid bar for taking out Φ 130mm from bar stock center of obtained bar stock, Ф is obtained
The hollow hollow billet of 268/ 180 × 1700mm of Ф；
Step 4, hollow hollow billet is placed in resistance furnace and is heated to 820~880 DEG C, kept the temperature after 0.5~1.5h in precise forging machine
2~3 fire of upper progress radial forging, finish forge is at 200/ 163 × L of Ф of Ф >=3800mm pipe, the radial ruler of pipe when forging
Very little allowance control pipe straightness < 3mm/1000mm after ± 1mm, finish forge；
Step 5, pipe is heated to 620~680 DEG C to make annealing treatment in vacuum annealing furnace, keeps the temperature sky after 1~3h
It is cold, eliminate machining stress；
Step 6, pipe is carried out to turnery processing on deep hole drilling machine, be processed into (Φ 190 ± 0.5) × 8 × L mm at
Quality control material；
Wherein titan alloy casting ingot is handled by step 2 and step 4, total forging ratio >=4.
Embodiment 4
Prepare 219 × 8.5mm of TA10 titanium alloy Φ (diameter × wall thickness) tubing:
Step 1, TA10 titanium alloy Φ 720mm ingot casting is prepared using vacuum consumable electrode arc furnace melting 2 times, using quenching gold
It is 885~895 DEG C that phase method, which measures the ingot casting transformation temperature,；
Step 2, after carrying out plane milling processing to ingot casting, surface coats antioxidant defense coating, heats simultaneously in gas furnace
It comes out of the stove after heat preservation, is forged into the bar stock of 292 × 1200mm of Φ in 10000 tons of quick forging machines later, specially forge 2 in monophase field
~3 fire, 2~3 fire of (alpha+beta) two-phase section forging, wherein monophase field heating temperature is 950~1000 DEG C, two-phase section heating temperature
820~880 DEG C of degree；
Step 3, by the machined solid bar for taking out Φ 170mm from bar stock center of obtained bar stock, Ф is obtained
The hollow hollow billet of 292/ 220 × 2000mm of Ф；
Step 4, hollow hollow billet is placed in resistance furnace and is heated to 820~880 DEG C, kept the temperature after 0.5~1.5h in precise forging machine
2~3 fire of upper progress radial forging, finish forge is at 233/ 192 × L of Ф of Ф >=4000mm pipe, the radial ruler of pipe when forging
Very little allowance control pipe straightness < 3mm/1000mm after ± 1mm, finish forge；
Step 5, pipe is heated to 620~680 DEG C to make annealing treatment in vacuum annealing furnace, keeps the temperature sky after 1~3h
It is cold, eliminate machining stress；
Step 6, pipe is carried out to turnery processing on deep hole drilling machine, is processed into (Φ 219 ± 0.5) × 8.5 × L mm's
Finished product tubing.
Wherein titan alloy casting ingot is handled by step 2 and step 4, total forging ratio >=4.
Embodiment 5
Prepare 159 × 6mm of TA22 titanium alloy Φ (diameter × wall thickness) tubing:
Step 1, TA22 titanium alloy Φ 720mm ingot casting is prepared using vacuum consumable electrode arc furnace melting 2 times, using quenching gold
It is 940~950 DEG C that phase method, which measures the ingot casting transformation temperature,；
Step 2, after carrying out plane milling processing to ingot casting, surface coats antioxidant defense coating, heats simultaneously in gas furnace
It comes out of the stove after heat preservation, is forged into the bar stock of 242 × 1200mm of Φ in 10000 tons of quick forging machines later, specially forge 3 in monophase field
~4 fire, 4~6 fire of (alpha+beta) two-phase section forging, wherein monophase field heating temperature is 1050~1100 DEG C, two-phase section heating temperature
Degree is 860~910 DEG C；
Step 3, by the machined solid bar for taking out Φ 115mm from bar stock center of 242 bar stock of Φ, Ф 242/ is obtained
The hollow hollow billet of 165 × 1200mm of Ф；
Step 4, hollow hollow billet is placed in resistance furnace and is heated to 860~910 DEG C, kept the temperature after 0.5~1.5h in precise forging machine
2~3 fire of upper progress radial forging, finish forge is at 170/ 135 × L of Ф of Ф >=3500mm pipe, the radial ruler of pipe when forging
Very little allowance control pipe straightness < 3mm/1000mm after ± 1mm, finish forge；
Step 5, pipe is heated to 680~740 DEG C to make annealing treatment in vacuum annealing furnace, keeps the temperature sky after 1~3h
It is cold, eliminate machining stress；
Step 6, pipe is carried out to turnery processing on deep hole drilling machine, be processed into (Φ 159 ± 0.4) × 6 × L mm at
Quality control material；
Wherein titan alloy casting ingot is handled by step 2 and step 4, total forging ratio >=5.
Embodiment 6
Prepare 190 × 6.5mm of TA22 titanium alloy Φ (diameter × wall thickness) tubing:
Step 1, TA22 titanium alloy Φ 720mm ingot casting is prepared using vacuum consumable electrode arc furnace melting 2 times, using quenching gold
It is 940~950 DEG C that phase method, which measures the ingot casting transformation temperature,；
Step 2, after carrying out plane milling processing to ingot casting, surface coats antioxidant defense coating, heats simultaneously in gas furnace
Come out of the stove after heat preservation, the bar stock that 255 × 1400mm of Φ is forged into 10000 tons of quick forging machines, specially monophase field forge 3~
4 fire, 4~6 fire of (alpha+beta) two-phase section forging, wherein monophase field heating temperature is 1050~1100 DEG C, two-phase section heating temperature
It is 860~910 DEG C；
Step 3, by the machined solid bar for taking out Φ 135mm from bar stock center of obtained bar stock, Ф is obtained
The hollow hollow billet of 255/ 185 × 1400mm of Ф；
Step 4, hollow hollow billet is placed in resistance furnace and is heated to 860~910 DEG C, kept the temperature after 0.5~1.5h in precise forging machine
2~3 fire of upper progress radial forging, finish forge is at 200/ 166 × L of Ф of Ф >=3500mm pipe, the radial ruler of pipe when forging
Very little allowance control pipe straightness < 3mm/1000mm after ± 1mm, finish forge；
Step 5, pipe is heated to 680~740 DEG C to make annealing treatment in vacuum annealing furnace, keeps the temperature sky after 1~3h
It is cold, eliminate machining stress；
Step 6, pipe is carried out to turnery processing on deep hole drilling machine, is processed into (Φ 190 ± 0.5) × 6.5 × L mm's
Finished product tubing；
Wherein titan alloy casting ingot is handled by step 2 and step 4, total forging ratio >=5.
Embodiment 7
The titanium alloy pipe that embodiment 1-6 is prepared carries out room-temperature mechanical property test, twice of each sample testing,
And compared with technical requirements, as a result as shown in Table 1 and Table 2, "-" expression does not require in table, and " actual measurement " presentation technology is wanted
There is no clear stipulaties numerical value in asking.
The TA10 titanium alloy pipe room-temperature mechanical property of 1 embodiment 1-4 of table
The TA22 titanium alloy pipe room-temperature mechanical property that 2 embodiment 5-6 of table is obtained
The titanium alloy pipe that embodiment 1-6 is obtained is carried out respectively:
(1) ultrasonic inspection, the tubing that all embodiments obtain are all satisfied 12969.1 standard requirements of GB/T.
(2) water pressure test: TA10 titanium alloy pipe test pressure is 7.5MPa, pressure maintaining 10min；The examination of TA22 titanium alloy pipe
Testing pressure is 14.5MPa, pressure maintaining 10min.
Test result shows that the tubing that all embodiments obtain is all satisfied water pressure test requirement.
(3) flattening test: the titanium alloy pipe flattening test that all embodiments obtain is qualified.
(4) flaring test: the titanium alloy pipe flaring test that all embodiments obtain is qualified.
Claims (8)
1. a kind of titanium alloy large-calibre seamless thin-wall pipes processing method, it is characterised in that: specifically comprise the following steps:
The forging of step (1) bar stock: carrying out multiple upsetting pull deformation for diameter of phi 622mm~Φ 820mm titan alloy casting ingot, sufficiently broken
Coarse as-cast structure, it is ensured that the forging permeability and structural homogenity of bar stock obtain Φ 220mm~Φ 292mm bar stock；
Step (2) machining: taking out the solid bar of 90~Φ of Φ 170mm by way of machining from bar stock center,
The hollow hollow billet of titanium alloy is obtained, hollow hollow billet internal diameter differs 40~60mm with the solid bar diameter of taking-up；
Step (3) finish forge: radial forging will be carried out after the hollow hollow billet heating and thermal insulation of titanium alloy, obtains titanium alloy pipe；
Step (4) annealing；
Step (5) machining: titanium alloy pipe after annealing carries out turnery processing, obtain outer diameter Φ 133~Φ 219mm,
6~8.5mm of wall thickness, length are greater than the titanium alloy pipe of 3000mm；
Wherein in step (1), titan alloy casting ingot first carries out upsetting pull deformation in monophase field, then carries out pulling deformation in alpha+beta two-phase section,
Wherein monophase field heating temperature is 60~150 DEG C of titanium alloy transformation temperature or more, and alpha+beta two-phase section heating temperature is transformation temperature or less 5
~80 DEG C.
2. titanium alloy large-calibre seamless thin-wall pipes processing method according to claim 1, it is characterised in that: the titanium alloy
The ingot casting trade mark is TA10, TA22, TA16, TA24 or TC4.
3. titanium alloy large-calibre seamless thin-wall pipes processing method according to claim 2, it is characterised in that: the titanium alloy
Ingot casting is obtained by vacuum consumable arc process melting.
4. titanium alloy large-calibre seamless thin-wall pipes processing method according to claim 1, it is characterised in that: in step (3),
Heating temperature is 820~910 DEG C, 30~150min of soaking time, and final forging temperature is not less than 700 DEG C.
5. titanium alloy large-calibre seamless thin-wall pipes processing method according to claim 1, it is characterised in that: in step (3),
The radial dimension allowance control of pipe pipe straightness < 3mm/1000mm after ± 1mm, finish forge when forging.
6. titanium alloy large-calibre seamless thin-wall pipes processing method according to claim 1, it is characterised in that: in step (4),
620~740 DEG C of annealing temperature, keep the temperature 1~3h after it is air-cooled.
7. titanium alloy large-calibre seamless thin-wall pipes processing method according to claim 1, it is characterised in that: in step (5),
Obtained titanium alloy pipe surfaces externally and internally roughness is not more than 3.2 μm.
8. titanium alloy large-calibre seamless thin-wall pipes processing method according to claim 1, it is characterised in that: the titanium alloy
Ingot casting is by the forging of step (1) bar stock and the processing of step (3) finish forge, total forging ratio >=4.
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