CN107413852B - Preparation method for the pure titanium hollow billet of TA2 - Google Patents
Preparation method for the pure titanium hollow billet of TA2 Download PDFInfo
- Publication number
- CN107413852B CN107413852B CN201710864190.5A CN201710864190A CN107413852B CN 107413852 B CN107413852 B CN 107413852B CN 201710864190 A CN201710864190 A CN 201710864190A CN 107413852 B CN107413852 B CN 107413852B
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- Prior art keywords
- hollow billet
- preparation
- pure titanium
- heating
- godet
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 239000010936 titanium Substances 0.000 title claims abstract description 52
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000005096 rolling process Methods 0.000 claims abstract description 18
- 238000006213 oxygenation reaction Methods 0.000 claims abstract description 17
- 229910000975 Carbon steel Inorganic materials 0.000 claims abstract description 8
- 239000010962 carbon steel Substances 0.000 claims abstract description 8
- 238000004080 punching Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 28
- 239000000498 cooling water Substances 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000001816 cooling Methods 0.000 claims description 13
- 238000002791 soaking Methods 0.000 claims description 8
- 238000005553 drilling Methods 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000000446 fuel Substances 0.000 claims description 3
- 238000005461 lubrication Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000012769 bulk production Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 150000001875 compounds Chemical group 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0239—Lubricating
- B21B45/0245—Lubricating devices
- B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B2045/0227—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0239—Lubricating
- B21B45/0245—Lubricating devices
- B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes
- B21B2045/026—Lubricating devices using liquid lubricants, e.g. for sections, for tubes for tubes
Abstract
The invention discloses a kind of preparation methods, especially disclose a kind of preparation method for the pure titanium hollow billet of TA2, belong to metal tube manufacturing process technical field.A kind of diameter that can effectively produce is provided greater than 100 ㎜, and can guarantee the preparation method for the pure titanium hollow billet of TA2 of the quality of production.The preparation method is based on ordinary carbon steel hollow billet oblique rolling perforated process, use the titanium base heated under micro-oxygenation atmospheric condition for blank, the pure titanium hollow billet that outer diameter is not less than 115 ㎜ is made by following piercing process parameters, it is 11%~13% that the piercing process parameter, which is overall diameter reduction ratio, and top front reduction ratio is 5.5%~7.5%, and oval coefficient is 1.16~1.22, feed angle is 8.5 °, rolling angle is 14.2 °, punching rate 0.20m/s, and godet speed is 0.60m/s.
Description
Technical field
The present invention relates to a kind of preparation methods to belong to gold more particularly, to a kind of preparation method for the pure titanium hollow billet of TA2
Belong to pipe manufacturing process technical field.
Background technique
Pure titanium is extremely active metal, is heated to 890 DEG C or more and is easy for reacting with O, N, H in air and generate
Compound forms brittle layer, influences the defects of being plastically deformed or cracking after deforming.Due to contract and Equipment, early period
Pure titanium hollow billet roll piercing mainly with barrel shaped roll roll piercing, specification also mostly in Φ 100mm hereinafter, rare Φ 200mm with
On hollow billet preparation.As certain contract requirements of military project pipe and marine worker pipe occur, the pure titanium hollow billet of Φ 200mm or more is needed to be
Cold rolling titanium tube provides blank, promotes to prepare pure titanium hollow billet using the roll piercing with rolling angle and possibility occurs.But due to oblique
The pure titanium blank of perforation procedure is rolled by more complicated alternate stress, and the axial rolling that the strain of generation is more common is increasingly complex, rolling
Process stability is poor, causes the above hollow billet preparation of Φ 200mm more difficult, fails effectively to carry out roll piercing always, also have no
There is the report of bulk production.
It perforates relative to squeezing, the synthesis production cost of roll piercing is lower, and is able to produce equivalent specifications outer diameter condition
The lower longer hollow billet of length, for this purpose, effectively realizing that pure titanium heavy caliber hollow billet oblique rolling perforated process just seems more necessary.
Summary of the invention
The technical problems to be solved by the present invention are: providing a kind of diameter that can effectively produce greater than 100 ㎜, and can guarantee
The preparation method for the pure titanium hollow billet of TA2 of the quality of production.
Used technical solution is to solve above-mentioned technical problem: a kind of preparation method for the pure titanium hollow billet of TA2, institute
The preparation method stated is based on ordinary carbon steel hollow billet oblique rolling perforated process, using the titanium base heated under micro-oxygenation atmospheric condition
For blank, the pure titanium hollow billet that outer diameter is not less than 115 ㎜ is made by following piercing process parameters,
It is 11%~13% that the piercing process parameter, which is overall diameter reduction ratio, top front reduction ratio be 5.5%~
7.5%, oval coefficient is 1.16~1.22, and feed angle is 8.5 °, and rolling angle is 14.2 °, punching rate 0.20m/s, godet
Speed is 0.60m/s.
The beneficial effects of the present invention are: by using above-mentioned technological parameter provided by the present application, it can be with ordinary carbon steel
Based on hollow billet oblique rolling perforated process, uses the titanium base heated under micro-oxygenation atmospheric condition that outer diameter is made for blank and be not less than
The pure titanium hollow billet of 180 ㎜.And since titanium base blank is heated under micro-oxygenation atmospheric condition, it can also be ensured that
A large amount of oxygen layer will not be generated in heating process, to guarantee the quality of the pure titanium hollow billet of production.
Further, first carrying out machine end to end in blank before carrying out the heating under micro-oxygenation atmospheric condition to titanium base
Tool drilling centering.
The preferred mode of the above solution is that parameter is when carrying out machine drilling centering end to end to blank,
Head end centering bore dia d=50 ± 2mm, depth h=40 ± 2mm；Tail end centering bore dia d=50 ± 2mm, depth
H=100 ± 2mm, and internal point bottom needs rounding off.
Further, coming directly towards when the blank completed to heating carries out roll piercing as in three small hole for water sprayings of band
Water cooling top, top outer surface carry out hanging mould processing；Roll is cutting and the half new roll that annular knurl cutter trade is just ground off；It leads
Disk is the half new godet that surface cutter trade is just ground off.
The preferred mode of the above solution is that cooling down operation process of interior water cooling top during apical pore is, water cooling mandril,
Cooling water is opened when top is in state to be rolled, cooling water is closed when retracting in top, and cooling water pressure after booster pump is maintained at
Between 0.7-1.0MPa.
Further: before perforation procedure, godet is first coated into special lube, to upper and lower godet in the operation of rolling
It applies slip coating and keeps lubrication；It is secondary bite foundation after perforating roller cooling water is reached into big water state be lubricated and cool down；It leads
Disk cooling water is opened again after the completion of perforation and is cooled down.
The preferred mode of the above solution is that being by following when being heated using micro-oxygenation atmospheric condition to titanium base
What work step was operated,
Annular furnace bringing-up section burner is closed, only opens soaking zone burner, air-fuel ratio is kept micro-oxygenation atmosphere by 12:1；?
The carbon steel stopper material of 2 same outer diameter scales of arrangement before and after titanium base, to guarantee that titanium base temperature is uniform；Annular furnace soaking zone instrument temperature
Degree control is at 890~900 DEG C.
Further, each section of rotary heating furnace of heating temperature and heating time are as follows,
Specific embodiment
In order to solve the above technical problems existing in the prior art, diameter can effectively be produced the present invention provides a kind of
Greater than 100 ㎜, and it can guarantee the preparation method for the pure titanium hollow billet of TA2 of the quality of production.The preparation method is with common carbon
Based on steel wool pipe oblique rolling perforated process, use the titanium base heated under micro-oxygenation atmospheric condition for blank, by following perforation
The pure titanium hollow billet that outer diameter is not less than 180 ㎜ is made in technological parameter, and it is 11% that the piercing process parameter, which is overall diameter reduction ratio,
~13%, top front reduction ratio is 5.5%~7.5%, and oval coefficient is 1.16~1.22, and feed angle is 8.5 °, and rolling angle is
14.2 °, punching rate 0.20m/s, godet speed is 0.60m/s.By using above-mentioned technological parameter provided by the present application, just
The titanium base heated under micro-oxygenation atmospheric condition can be used for blank system based on ordinary carbon steel hollow billet oblique rolling perforated process
Obtain the pure titanium hollow billet that outer diameter is not less than 180 ㎜.And since titanium base blank is heated under micro-oxygenation atmospheric condition,
It can also guarantee that a large amount of oxygen layer will not be generated during heating, to guarantee the quality of the pure titanium hollow billet of production.
In above embodiment, in order to avoid pure titanium blank to generate oxide layer in heating process to greatest extent, using
It when micro-oxygenation atmospheric condition heats titanium base, is operated by following work steps, closes annular furnace bringing-up section burner,
Soaking zone burner is only opened, air-fuel ratio is kept micro-oxygenation atmosphere by 12:1；2 same outer diameter scales are arranged before and after titanium base
Carbon steel stopper material, to guarantee that titanium base temperature is uniform；Annular furnace soaking zone instrument temperature is controlled at 890~900 DEG C；And annular adds
The heating temperature and heating time that each section of hot stove are as follows,
In order to guarantee the quality of production of the pure titanium hollow billet of major diameter to greatest extent, this application provides further technique limits
Determine parameter and first carries out machine drilling centering end to end in blank that is, before carrying out the heating under micro-oxygenation atmospheric condition to titanium base；
Particularly, when carrying out machine drilling centering end to end to blank, parameter is, head end centering bore dia d=50 ± 2mm, depth h
=40 ± 2mm；Tail end centering bore dia d=50 ± 2mm, depth h=100 ± 2mm, and internal point bottom needs rounding off.
When the blank completed to heating carries out roll piercing, the interior water cooling top for three small hole for water sprayings of band is come directly towards, outer surface is come directly towards
It carries out hanging mould processing；Roll is cutting and the half new roll that annular knurl cutter trade is just ground off；Godet is that surface cutter trade is rigid
The half new godet ground off well；Cooling down operation process of interior water cooling top during apical pore is that water cooling mandril, top are in be rolled
Open cooling water when state, cooling water is closed in top when retracting, cooling water pressure after booster pump be maintained at 0.7-1.0MPa it
Between；Before perforation procedure, godet is first coated into special lube, slip coating is applied to upper and lower godet in the operation of rolling and keeps profit
It is sliding；It is secondary bite foundation after perforating roller cooling water is reached into big water state be lubricated and cool down；Godet cooling water is being perforated
Cheng Houzai opening is cooled down.
Embodiment
Specifically operating procedure is
The heating temperature and heating time that each section of rotary heating furnace
TA2 quickly arrives punch after coming out of the stove and perforates, and perforation is carried out by designed technological parameter.
Cooling water (cooling water is closed when retracting in top), cooling water warp are opened when water cooling mandril, top are in state to be rolled
Pressure is maintained between 0.7-1.0MPa after booster pump.
With 340 adhesion resistant steel slip coatings (i.e. with 159 red oil+ink-consolidating agent 1:1 exchange), first godet is coated before perforation dedicated
Lubricating oil applies slip coating to upper and lower godet in the operation of rolling and keeps lubrication；It is secondary bite foundation after perforating roller cooling water is opened
To big water state, led to be lubricated and to cool down；Godet cooling water is opened again after the completion of perforation and is cooled down.
Embodiment 1
Roll piercing is the hollow billet of Φ 212 × 16 after the pure titanium blank heating of the TA2 of Φ 200.
Embodiment 2
Roll piercing is the hollow billet of Φ 179 × 18.5 after the pure titanium blank heating of the TA2 of Φ 160.
Embodiment 3
Roll piercing is the hollow billet of Φ 118 × 9.5 after the pure titanium blank heating of the TA2 of Φ 115.
Claims (4)
1. a kind of preparation method for the pure titanium hollow billet of TA2, it is characterised in that: the preparation method is oblique with ordinary carbon steel hollow billet
Based on rolling piercing process, use the titanium base heated under micro-oxygenation atmospheric condition for blank, by following piercing process parameters
The pure titanium hollow billet that outer diameter is not less than 115 ㎜ is made,
It is 11%~13% that the piercing process parameter, which is overall diameter reduction ratio, and top front reduction ratio is 5.5%~7.5%, ellipse
Circle coefficient is 1.16~1.22, and feed angle is 8.5 °, and rolling angle is 14.2 °, punching rate 0.20m/s, and godet speed is
0.60m/s,
Before carrying out the heating under micro-oxygenation atmospheric condition to titanium base, machine drilling centering is first carried out end to end in blank,
When carrying out machine drilling centering end to end to blank, parameter is, head end centering bore dia d=50 ± 2mm, depth h=40 ±
2mm；Tail end centering bore dia d=50 ± 2mm, depth h=100 ± 2mm, and internal point bottom needs rounding off,
When the blank completed to heating carries out roll piercing, the interior water cooling top for three small hole for water sprayings of band is come directly towards, top is outer
Surface carries out hanging mould processing；Roll is cutting and the half new roll that annular knurl cutter trade is just ground off；Godet is that surface processes trace
The half new godet that mark is just ground off,
Cooling down operation process of interior water cooling top during apical pore is to open when water cooling mandril, top are in state to be rolled cold
But cooling water is closed when retracting in water, top, and cooling water pressure after booster pump is maintained between 0.7-1.0MPa.
2. the preparation method according to claim 1 for the pure titanium hollow billet of TA2, it is characterised in that: before perforation procedure, first
Godet is coated into special lube, slip coating is applied to upper and lower godet in the operation of rolling and keeps lubrication；Secondary general after biting foundation
Perforating roller cooling water reaches big water state and is lubricated and cools down；Godet cooling water is opened again after the completion of perforation and is cooled down.
3. being used for the preparation method of the pure titanium hollow billet of TA2 described according to claim 1~any one of 2, it is characterised in that: adopting
It when being heated with micro-oxygenation atmospheric condition to titanium base, is operated by following work steps,
Annular furnace bringing-up section burner is closed, only opens soaking zone burner, air-fuel ratio is kept micro-oxygenation atmosphere by 12:1；In titanium base
The carbon steel stopper material of 2 same outer diameter scales is arranged in front and back, to guarantee that titanium base temperature is uniform；Annular furnace soaking zone instrument temperature control
System is at 890~900 DEG C.
4. the preparation method according to claim 3 for the pure titanium hollow billet of TA2, it is characterised in that: each section of rotary heating furnace
Heating temperature and heating time it is as follows,
。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710864190.5A CN107413852B (en) | 2017-09-22 | 2017-09-22 | Preparation method for the pure titanium hollow billet of TA2 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710864190.5A CN107413852B (en) | 2017-09-22 | 2017-09-22 | Preparation method for the pure titanium hollow billet of TA2 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107413852A CN107413852A (en) | 2017-12-01 |
| CN107413852B true CN107413852B (en) | 2019-04-30 |
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ID=60433591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101029348A (en) * | 2007-03-27 | 2007-09-05 | 西部钛业有限责任公司 | Process for heating titanium oblique perforating rod ingot |
| CN101708511A (en) * | 2007-12-13 | 2010-05-19 | 攀钢集团四川长城特殊钢有限责任公司 | Method for manufacturing pure titanium seamless tubes |
| CN103934269A (en) * | 2014-03-31 | 2014-07-23 | 攀钢集团成都钢钒有限公司 | TC4 titanium alloy seamless tube and production method thereof |
| CN104259206A (en) * | 2014-08-29 | 2015-01-07 | 攀钢集团成都钢钒有限公司 | Production method of titanium alloy seamless tubes used for tubing coupling |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6444204A (en) * | 1987-08-10 | 1989-02-16 | Sumitomo Metal Ind | Production of seamless titanium pipe |
-
2017
- 2017-09-22 CN CN201710864190.5A patent/CN107413852B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101029348A (en) * | 2007-03-27 | 2007-09-05 | 西部钛业有限责任公司 | Process for heating titanium oblique perforating rod ingot |
| CN101708511A (en) * | 2007-12-13 | 2010-05-19 | 攀钢集团四川长城特殊钢有限责任公司 | Method for manufacturing pure titanium seamless tubes |
| CN103934269A (en) * | 2014-03-31 | 2014-07-23 | 攀钢集团成都钢钒有限公司 | TC4 titanium alloy seamless tube and production method thereof |
| CN104259206A (en) * | 2014-08-29 | 2015-01-07 | 攀钢集团成都钢钒有限公司 | Production method of titanium alloy seamless tubes used for tubing coupling |
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| Publication number | Publication date |
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| CN107413852A (en) | 2017-12-01 |
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Effective date of registration: 20220804 Address after: 610306 Chengdu City, Chengdu, Sichuan, China (Sichuan) free trade test zone, Chengdu City, Qingbaijiang District, xiangdao Boulevard, Chengxiang Town, No. 1509 (room 13, A District, railway port mansion), room 1319 Patentee after: Chengdu advanced metal material industry technology Research Institute Co.,Ltd. Patentee after: PANGANG GROUP RESEARCH INSTITUTE Co.,Ltd. Address before: 610000 Panzhihua Iron and Steel Group Research Institute Co.,Ltd. Patentee before: PANGANG GROUP RESEARCH INSTITUTE Co.,Ltd. |