CN102021356B - Crucible support system and discharge control system of VN alloy medium frequency induction heating furnace - Google Patents
Crucible support system and discharge control system of VN alloy medium frequency induction heating furnace Download PDFInfo
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- CN102021356B CN102021356B CN2010105320794A CN201010532079A CN102021356B CN 102021356 B CN102021356 B CN 102021356B CN 2010105320794 A CN2010105320794 A CN 2010105320794A CN 201010532079 A CN201010532079 A CN 201010532079A CN 102021356 B CN102021356 B CN 102021356B
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- transmitter
- vacuum
- mechanical manipulator
- telltale
- crucible
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 20
- 239000000956 alloy Substances 0.000 title claims abstract description 20
- 238000010438 heat treatment Methods 0.000 title claims abstract description 13
- 230000006698 induction Effects 0.000 title claims abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000010439 graphite Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 4
- 238000007599 discharging Methods 0.000 claims description 27
- 241000209456 Plumbago Species 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 230000007246 mechanism Effects 0.000 claims description 8
- 230000000630 rising effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 16
- 230000008569 process Effects 0.000 abstract description 10
- 229910002804 graphite Inorganic materials 0.000 abstract description 2
- 239000010720 hydraulic oil Substances 0.000 abstract 1
- 239000003921 oil Substances 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 description 7
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000005121 nitriding Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000012299 nitrogen atmosphere Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- INZDTEICWPZYJM-UHFFFAOYSA-N 1-(chloromethyl)-4-[4-(chloromethyl)phenyl]benzene Chemical compound C1=CC(CCl)=CC=C1C1=CC=C(CCl)C=C1 INZDTEICWPZYJM-UHFFFAOYSA-N 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910001199 N alloy Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- SKKMWRVAJNPLFY-UHFFFAOYSA-N azanylidynevanadium Chemical compound [V]#N SKKMWRVAJNPLFY-UHFFFAOYSA-N 0.000 description 1
- 229940067573 brown iron oxide Drugs 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000010259 detection of temperature stimulus Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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Abstract
The invention discloses a crucible support system and a discharge control system of a VN alloy medium frequency induction heating furnace, including a crucible support device, a discharge device and a control device, wherein the crucible support device is a material support mechanical arm (3); the discharge device includes a cooler (1), a graphite crucible (2), a chest gate (4), a vacuum chamber (5), vacuum chamber doors (6), a discharge oil cylinder (7) and a vacuum pump (8); the control device includes a control unit, a displayer, a sensor group and an indication unit. In the Crucible support system and the discharge control system of the VN alloy medium frequency induction heating furnace, an full-automatic touch screen is used as an operation control interface, so that operation is visualized and simple, and degree of automation is high; an hydraulic oil cylinder implements accurate location under the control of a computer; and a discharge cabin between the two vacuum chambers is provided with a vacuum device and a vacuum degree sensor, thereby ensuring anaerobic property of a discharge process.
Description
Technical field
The present invention relates to a kind of automatic control device, particularly relate to a kind of VN alloy Medium Frequency Induction Heating Furnace crucible support system and discharging system.
Background technology
VN alloy is good steel-making additive; Can be used for structure iron, TS, pipe line steel, reinforcing bar, common engineering steel and cast iron; Can significantly improve the comprehensive mechanical performances such as wear resistance, rotproofness, toughness, intensity, hardness, ductility and thermal fatigue resistance of steel; And make steel have good weldability ability, and play effects such as eliminating the inclusion extension.
At present, in producing the existing technology of VN alloy, all adopt nitriding process to prepare VN alloy.U.S. combinating carbide company is that the method for preparing VN alloy of representative has following three kinds: (1) is with V
2O
3, compound stalk forming behind iron powder and the carbon dust mixing; In vacuum oven, obtain vanadium carbide after 60 hours in insulation under 1385 ℃; Nitriding 2 hours and 6 hours respectively makes the VN alloy that contains 78.7%V, 7.3%N and 10.5%C when cooling the temperature to 1100 ℃ and 1000 ℃ again.(2) use V
2O
5With carbon mixture in vacuum oven internal heating to 1100～1500 ℃, vacuumize and feed the nitrogen nitriding, repeat such process for several times, obtain carbon containing, oxygen at last and all be lower than 2% VN alloy.(3) with high price barium oxide V
2O
5Or NH
4VO
3Deng being raw material, with mixed gas (N
2+ NH or N
2+ H
2) be reductive agent and nitridizing agent; At 675～700 ℃ of following prereduction l hours, low-melting high price barium oxide is reduced into dystectic low price barium oxide earlier, under 950 ℃, reduces simultaneously afterwards and nitriding 3～4 hours; Can obtain to contain the oxygen massfraction and be 3%～20% nitrogen vanadyl product; It is mixed with carbonaceous material, 1400 ℃ of pyroprocessing obtain basic composition is of VN alloy: 80%V, 12%N, 7%C and 2%O at last under inertia or nitrogen atmosphere or in the vacuum oven again.
The weak point that U.S. combinating carbide company prepares the method for VN alloy is: (1) heating must continuously vacuumize with electric furnace, and the manufacturing of equipment is had very high withstand voltage and seal request, and cost is very high; (2) the interval type mode of production has very high technical requirements quality control difficulty relatively large to the control of production technique; (3) efficiency and facility investment efficient are lower, and a set of equipment was fired the many needs of one-period more than 60 hour, and few skinny device also needs more than 30 hour, and efficient is lower; (4) energy consumption is high, and the energy that vacuum unit and interval type type of heating consume is higher than continuous atmospheric unit.
In order to overcome the shortcoming that interval type is produced; One Chinese patent application " a kind of method and apparatus of producing VN alloy " (application number: 200910089322.7) vanadium pentoxide powder, carbon dust, brown iron oxide and sticker are mixed back compacting balling-up by a certain percentage; The ball of compacting is packed in the Medium frequency induction shaft furnace; Under nitrogen atmosphere; Under 1000～1700 ℃ of temperature, react and came out of the stove in 2～3 hours, then cooling obtains 76～8 1%V, 10～2 1 N%, 1～9%C, 1～2%Fe under nitrogen atmosphere, and apparent density is not less than the vanadium-nitrogen alloy product of 3.5 g/cm3.Its advantage is can be continuously produced, production efficiency is high, and the production equipment facility investment is few, the technical process compact, and induction shaft furnace thermo-efficiency is high, can online temperature control, make full use of reaction heat, the energy saving technology environmental protection.
" a kind of method and apparatus of producing VN alloy " (application number: 200910089322.7) though overcome the deficiency that interval type is produced; But still there are many weak points; Mainly comprise: do not constitute the anoxybiotic environment in the design of (1) bed rearrangement furnace binding, the graphite heater container is prone to rapid oxidation under the high-temperature situation; (2) detection of temperature, vacuum tightness etc. and control method are unreliable, and to go into the detection mode of thermopair unreliable for skewer in the spiral slit of induction coil, intermediate frequency disturb and the measuring point contact surface not enough, cause the temperature survey deviation excessive, temperature automatically controlled difficult realization; (3) preheating section, reduction section and cooling section are all too short, and products production is once accomplished in stove; (4) discharging mechanism adopts the design of gripping unit, and is unfavorable to the plumbago crucible of charge, and it is broken that the excessive plumbago crucible of clamping force is prone to folder, the too small weight that might can not hold in the palm furnace charge of clamping force; (5) discharging process can not guarantee that anoxybiotic causes the product oxidation.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of VN alloy Medium Frequency Induction Heating Furnace crucible support system and discharging system are provided.
Goal of the invention of the present invention realizes through following technical scheme: VN alloy Medium Frequency Induction Heating Furnace crucible support system and discharging system, and it comprises crucible bracing or strutting arrangement, drawing mechanism and gear, wherein:
Described crucible bracing or strutting arrangement is the retainer mechanical manipulator; Described drawing mechanism comprises water cooler, plumbago crucible, casket door, Vakuumkammer, door for vacuum chamber, discharging oil cylinder and vacuum pump; Be provided with able to turn on or off gate between water cooler and the Vakuumkammer; Plumbago crucible is by the water cooler importing and by the holding of retainer mechanical manipulator; The cylinder bar of discharging oil cylinder stretches in the Vakuumkammer, and the side of Vakuumkammer is provided with door for vacuum chamber, and vacuum pump is connected with Vakuumkammer through conduit.
Described gear comprises control unit, indicating meter, sensor groups and indicating member.
Described control unit is the PLC unit.
Described indicating meter is a touching-type monitor.
Described sensor groups comprises that vacuum sensor, upper limit transmitter, lower limit transmitter, station sensor, mechanical manipulator drive transmitter, mechanical manipulator and close that transmitter left by transmitter, gate, gate closes transmitter, Vacuum door switch sensor and safeguard protection transmitter; Vakuumkammer is interior along being respectively arranged with safeguard protection transmitter, upper limit transmitter, station sensor, vacuum sensor and lower limit transmitter from top to bottom on the cylinder bar vertical motion direction of discharging oil cylinder; Gate closes transmitter and gate is driven transmitter being provided with respectively corresponding to the pass of casket door and open position place; At the other Vacuum door switch sensor that is provided with of door for vacuum chamber, be provided with mechanical manipulator in opening of retainer mechanical manipulator and closed position correspondence and drive transmitter and mechanical manipulator pass transmitter.
Described indicating member comprises that vacuum pump telltale, oil pump telltale, end oil cylinder rising telltale, end oil cylinder drop indicator, mechanical manipulator leave telltale, mechanical manipulator and close that telltale left by telltale, gate, gate closes telltale and warning indicator.
Described gear also comprises a man-auto change-over switch.
Working process of the present invention roughly is: the plumbago crucible of splendid attire material imports the back by the holding of retainer mechanical manipulator by water cooler.When the discharging program gets into working order, at first Vakuumkammer is vacuumized by vacuum pump, reach set(ting)value after, gate opening; The discharging oil cylinder rises, and when the pallet on the oil cylinder contacted the plumbago crucible bottom, the retainer mechanical manipulator was opened, and the discharging oil cylinder descends; Displacement sensor sender when oil cylinder drops to a station, the retainer mechanical manipulator closes up, and guides to the Vakuumkammer bottom under the discharging oil cylinder continues; Gate returns to closing condition, and door for vacuum chamber is opened, and accomplishes the discharging process.
Advantage of the present invention is: structure design is unique, and stopping property, safety are very high; Adopt full-automatic touch-screen as controling the interface, operation is directly perceived simple, and level of automation is high; Hydraulic ram adopts embedded magnetostrictive displacement sensor, under computer control, has realized accurate location; Vakuumkammer adopts the design of dual seal door, goes out between two simultaneously that feed bin is provided with vacuum unit and vacuum sensor can be guaranteed discharging process anoxybiotic.
Description of drawings
The structural representation of Fig. 1 drawing mechanism of the present invention
The composition frame chart of Fig. 2 gear of the present invention
Fig. 3 control flow chart of the present invention
One of Fig. 4 sensor placement structural representation of the present invention
Two of Fig. 5 sensor placement structural representation of the present invention
Wherein, 1-water cooler, 2-plumbago crucible, 3-retainer mechanical manipulator, 4-casket door; The 5-Vakuumkammer, 6-door for vacuum chamber, 7-discharging oil cylinder, 8-vacuum pump, 9-vacuum pump telltale; 10-oil pump telltale, oil cylinder rising telltale at the bottom of the 11-, oil cylinder drop indicator at the bottom of the 12-, the 13-mechanical manipulator is driven telltale, and the 14-mechanical manipulator closes telltale; The 15-gate is driven telltale, and the 16-gate closes telltale, 17-warning indicator, 18-indicating meter, 19-vacuum sensor; 20-upper limit transmitter, 21-lower limit transmitter, the 22-station sensor, the 23-mechanical manipulator is driven transmitter, and the 24-mechanical manipulator closes transmitter; The 25-gate is driven transmitter, and the 26-gate closes transmitter, 27-Vacuum door switch sensor, 28-safeguard protection transmitter, 29-man-auto change-over switch.
Embodiment
Further describe technical scheme of the present invention below in conjunction with accompanying drawing: like Fig. 1 VN alloy Medium Frequency Induction Heating Furnace crucible support system and discharging system; It comprises crucible bracing or strutting arrangement, drawing mechanism and gear, and wherein: described crucible bracing or strutting arrangement is a crucible bottom retainer mechanical manipulator 3; Described drawing mechanism comprises water cooler 1, plumbago crucible 2, casket door 4, Vakuumkammer 5, door for vacuum chamber 6, discharging oil cylinder 7 and vacuum pump 8; Be provided with able to turn on or off gate 4 between water cooler 1 and the Vakuumkammer 5; Plumbago crucible 2 is by water cooler 1 importing and by 3 holdings of retainer mechanical manipulator; The cylinder bar of discharging oil cylinder 7 stretches in the Vakuumkammer 5, and the side of Vakuumkammer 5 is provided with door for vacuum chamber 6, and vacuum pump 8 is connected with Vakuumkammer 5 through conduit;
Like Fig. 3, described gear comprises control unit, indicating meter 18, sensor groups and indicating member.
Described control unit is the PLC unit.
Described indicating meter 18 is a touching-type monitor.
Like Fig. 3, Fig. 4 and Fig. 5; Described sensor groups comprises that vacuum sensor 19, upper limit transmitter 20, lower limit transmitter 21, station sensor 22, mechanical manipulator drive transmitter 23, mechanical manipulator and close that transmitter 25 left by transmitter 24, gate, gate closes transmitter 26, Vacuum door switch sensor 27 and safeguard protection transmitter 28; Vakuumkammer 5 is interior along being respectively arranged with safeguard protection transmitter 28, upper limit transmitter 20, station sensor 22, vacuum sensor 19 and lower limit transmitter 21 from top to bottom on the cylinder bar vertical motion direction of discharging oil cylinder 7; Close transmitter 26 and drive transmitter 25 being provided with gate respectively corresponding to the pass of casket door 4 and open position place with gate; At the other Vacuum door switch sensors 27 that are provided with of door for vacuum chamber 6, be provided with mechanical manipulator in opening of retainer mechanical manipulator 3 and closed position correspondence and drive transmitter 23 and close transmitter 24 with mechanical manipulator.
Described indicating member comprises that vacuum pump telltale 9, oil pump telltale 10, end oil cylinder rising telltale 11, end oil cylinder drop indicator 12, mechanical manipulator leave telltale 13, mechanical manipulator and close that telltale 15 left by telltale 14, gate, gate closes telltale 16 and warning indicator 17.
Described gear also comprises a man-auto change-over switch 29.
Working process of the present invention such as Fig. 2, the plumbago crucible 2 of splendid attire material imports the back by 3 holdings of retainer mechanical manipulator by water cooler 1.When the discharging program gets into working order, at first vacuumize by 8 pairs of Vakuumkammers 5 of vacuum pump, reach set(ting)value after, gate 4 is opened; Discharging oil cylinder 7 rises, and when the pallet on the oil cylinder contacted plumbago crucible 2 bottoms, retainer mechanical manipulator 3 was opened, and discharging oil cylinder 7 descends; Displacement sensor sender when oil cylinder drops to a station, retainer mechanical manipulator 3 closes up, and guides to Vakuumkammer 5 bottoms under discharging oil cylinder 7 continues; Gate 4 returns to closing condition, and door for vacuum chamber 6 is opened, and accomplishes the discharging process.
Claims (2)
1. VN alloy Medium Frequency Induction Heating Furnace crucible supports and the discharging system, and it is characterized in that: it comprises crucible bracing or strutting arrangement, drawing mechanism and gear, wherein:
Described crucible bracing or strutting arrangement is a crucible bottom retainer mechanical manipulator (3), and the anchorage force of retainer mechanical manipulator (3) is not less than 3 tons, and bearing height is not less than 20 meters; Described drawing mechanism comprises water cooler (1), plumbago crucible (2), casket door (4), Vakuumkammer (5), door for vacuum chamber (6), discharging oil cylinder (7) and vacuum pump (8); Be provided with able to turn on or off gate (4) between water cooler (1) and the Vakuumkammer (5); Plumbago crucible (2) is by water cooler (1) importing and by retainer mechanical manipulator (3) holding; The cylinder bar of discharging oil cylinder (7) stretches in the Vakuumkammer (5); The side of Vakuumkammer (5) is provided with door for vacuum chamber (6), and vacuum pump (8) is connected with Vakuumkammer (5) through conduit;
Described gear comprises control unit, indicating meter (18), sensor groups and indicating member, and described control unit is the PLC unit, and described indicating meter (18) is a touching-type monitor;
Described sensor groups comprises that vacuum sensor (19), upper limit transmitter (20), lower limit transmitter (21), station sensor (22), mechanical manipulator drive transmitter (23), mechanical manipulator and close that transmitter (25) left by transmitter (24), gate, gate closes transmitter (26), Vacuum door switch sensor (27) and safeguard protection transmitter (28); Set out in the Vakuumkammer (5) on the piston rod vertical motion direction of material oil cylinder (7) and be respectively arranged with safeguard protection transmitter (28), upper limit transmitter (20), station sensor (22), vacuum sensor (19) and lower limit transmitter (21) from top to bottom; Gate closes transmitter (26) and gate is driven transmitter (25) being provided with respectively corresponding to the pass of casket door (4) and open position place; At the other Vacuum door switch sensor (27) that is provided with of door for vacuum chamber (6), be provided with mechanical manipulator in opening of retainer mechanical manipulator (3) and closed position correspondence and drive transmitter (23) and mechanical manipulator pass transmitter (24);
Described indicating member comprises that vacuum pump telltale (9), oil pump telltale (10), end oil cylinder rising telltale (11), end oil cylinder drop indicator (12), mechanical manipulator leave telltale (13), mechanical manipulator and close that telltale (15) left by telltale (14), gate, gate closes telltale (16) and warning indicator (17).
2. VN alloy Medium Frequency Induction Heating Furnace crucible according to claim 1 supports and the discharging system, and it is characterized in that: described gear also comprises a man-auto change-over switch (29).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105320794A CN102021356B (en) | 2011-01-21 | 2011-01-21 | Crucible support system and discharge control system of VN alloy medium frequency induction heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105320794A CN102021356B (en) | 2011-01-21 | 2011-01-21 | Crucible support system and discharge control system of VN alloy medium frequency induction heating furnace |
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| Publication Number | Publication Date |
|---|---|
| CN102021356A CN102021356A (en) | 2011-04-20 |
| CN102021356B true CN102021356B (en) | 2012-08-22 |
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| CN2010105320794A Expired - Fee Related CN102021356B (en) | 2011-01-21 | 2011-01-21 | Crucible support system and discharge control system of VN alloy medium frequency induction heating furnace |
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| CN102676828A (en) * | 2012-06-04 | 2012-09-19 | 昆明理工大学 | Equipment for extracting gold and silver from lead/bismuth base alloy |
| CN103092217B (en) * | 2012-12-29 | 2015-07-15 | 中国科学院沈阳科学仪器股份有限公司 | Control system and control method of electronic gun crucible positioning |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201326005Y (en) * | 2008-12-09 | 2009-10-14 | 北京七星华创磁电科技有限公司 | Vacuum melting crucible induction furnace |
| CN101603132A (en) * | 2009-07-16 | 2009-12-16 | 钢铁研究总院 | A kind of method and apparatus of production VN alloy |
| CN101782320A (en) * | 2010-01-08 | 2010-07-21 | 河南省西保冶材集团有限公司 | Vanadium-nitrogen alloy vacuum furnace |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201952478U (en) * | 2011-04-23 | 2011-08-31 | 四川展祥特种合金科技有限公司 | Crucible supporting system and discharging control system for vanadium-nitride alloy medium frequency induction heating furnace |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201326005Y (en) * | 2008-12-09 | 2009-10-14 | 北京七星华创磁电科技有限公司 | Vacuum melting crucible induction furnace |
| CN101603132A (en) * | 2009-07-16 | 2009-12-16 | 钢铁研究总院 | A kind of method and apparatus of production VN alloy |
| CN101782320A (en) * | 2010-01-08 | 2010-07-21 | 河南省西保冶材集团有限公司 | Vanadium-nitrogen alloy vacuum furnace |
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