CN106180598B - A kind of the control nitrogen pouring procedure and running gate system of nitrogenous steel ingot - Google Patents
A kind of the control nitrogen pouring procedure and running gate system of nitrogenous steel ingot Download PDFInfo
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- CN106180598B CN106180598B CN201610565786.0A CN201610565786A CN106180598B CN 106180598 B CN106180598 B CN 106180598B CN 201610565786 A CN201610565786 A CN 201610565786A CN 106180598 B CN106180598 B CN 106180598B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
- B22D1/002—Treatment with gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
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- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The present invention relates to a kind of control nitrogen pouring procedure of nitrogenous steel ingot and running gate systems, which comprises ingot mould is put into vacuum chamber, is filled with nitrogen after vacuumizing, makes the vacuum chamber internal and external pressure balance；Molten steel is poured into the ingot mould under nitrogen protection atmosphere, solidification cooling forms steel ingot；The running gate system includes vacuum tank (6), the ingot mould (4) being placed in the vacuum tank (6) and the tundish (2) being placed in above the vacuum tank (6)；The tapping hole of the tundish (2) is connected to the steel mouth that pours of the ingot mould (4)；Tundish core bar (9) upper end is connected with nitrogen cylinder (12)；The vacuum tank (6) is connected with vacuum system and nitrogen bus system (5).This method and system can not only guarantee that [N] constituent content reaches specification requirement in molten steel in casting process, while can remove in molten steel [H] element and [O] element.
Description
Technical field
The present invention relates to the control nitrogen pouring procedures and casting system of Casting Technology field more particularly to a kind of nitrogenous steel ingot
System.
Background technique
Large-scale steel ingot pouring procedure is broadly divided into vacuum pouring and atmosphere casting at present.Wherein vacuum pouring is in vacuum chamber
Interior completion casting, keeps molten steel surrounding enviroment to have certain vacuum degree, so as to preferably remove in molten steel [H] element, [O]
Element and [N] element；Atmosphere casting is then to carry out in an atmosphere, generally flows to casting and carries out gas shield, and this method removes steel
In [H] element, the effect of [O] element and [N] element it is general, or even molten steel can be caused to inhale [H] element and [O] due to misoperation
Element.
Before pouring molten steel, first by chemical component in refining controlling molten steel, respectively to [C], [Mn], [Cr], [Ni],
[Mo], [H], [O], [N] element mass fraction are controlled, and after smelting molten steel, steel necessarily occur in transport and casting process
[H] element, [O] element and [N] constituent content increase in water；Using above-mentioned vacuum casting method, molten steel can be preferably removed
In [H] element, [O] element and [N] element, using above-mentioned atmosphere pouring procedure, then [H] element and [O] in molten steel more difficult to control
Element.However the steel ingot for manufacturing low [H] element, low [O] element and high [N] constituent content, such as ultra supercritical rotor steel
Ingot, above two method do not reach requirement, therefore not applicable.
Summary of the invention
In view of above-mentioned analysis, the present invention is intended to provide the control nitrogen pouring procedure and running gate system of a kind of nitrogenous steel ingot, are somebody's turn to do
Method and system can not only guarantee that [N] constituent content reaches specification requirement in molten steel in casting process, while can remove
[H] element and [O] element, keep it in a lower level in molten steel.
The purpose of the present invention is mainly achieved through the following technical solutions: one aspect of the present invention provides a kind of nitrogenous steel ingot
Control nitrogen pouring procedure, comprising: firstly, ingot mould is put into vacuum chamber, be filled with nitrogen after vacuumizing, make inside and outside the vacuum chamber
Pressure balance；Secondly, molten steel is poured into the ingot mould under nitrogen protection atmosphere, solidification cooling forms steel ingot, completes
Casting.
Further, using tundish by pouring molten steel to the ingot mould, specifically include: firstly, ingot mould is put into
Vacuum chamber is filled with nitrogen after vacuumizing, and makes the vacuum chamber internal and external pressure balance；Secondly, it is filled with nitrogen into tundish core bar,
Then the vacuum chamber is entered by tundish core bar lower end；Finally, the molten steel for having been carried out chemical Composition Control is injected
The tundish promotes the tundish core bar, makes to inject the steel ingot by the tundish under molten steel nitrogen carrier gas protective atmosphere
In mould, solidification cooling forms steel ingot, completes casting.
Further, described be evacuated to after vacuum degree is 150Pa or less is filled with nitrogen.
Another aspect of the present invention also provide it is a kind of for execute above-mentioned nitrogenous steel ingot control nitrogen pouring procedure running gate system,
It include: vacuum tank, the tundish that is placed in the intracorporal ingot mould of the vacuum tank and is placed in above the vacuum tank；Its
In, the tapping hole of the tundish is connected to the steel mouth that pours of the ingot mould, guarantees that molten steel is infused from the tapping hole of the tundish
Enter in ingot mould；Tundish core bar upper end is connected with nitrogen cylinder, guarantees molten steel under nitrogen protection atmosphere from tundish
Tapping hole injects in ingot mould；The vacuum tank is connected with vacuum system and nitrogen bus system.
Further, vacuum lid, tool in the vacuum cover body are provided between the vacuum tank and the tundish
Have diversion pipe up and down, the diversion pipe upper end is connected to the tundish tapping hole, the diversion pipe lower end with it is described
Ingot mould pours the connection of steel mouth.
Further, pressure gauge is provided on the vacuum tank.
Further, valve is provided between the vacuum tank and the vacuum system, nitrogen bus system.
Further, gas bleeder valve is provided on the vacuum tank and the vacuum lid.
Further, the nitrogen bus system has nitrogen cylinder group and each nitrogen with the nitrogen cylinder group
The gas bus bar of bottle connection.
The present invention has the beneficial effect that:
Control nitrogen pouring procedure and system of the present invention, carry out nitrogen protection casting in vacuum tank, and nitrogen enters true
Expansion is atomized molten steel after slack tank, [H] element and [O] element can not only be removed in molten steel, simultaneously because in nitrogen protection gas
It is poured under atmosphere, can guarantee in molten steel that [N] constituent content is constant, to realize the steel ingot of low [H], low [O] and higher [N] content
Casting.
Other features and advantages of the present invention will illustrate in the following description, also, partial become from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by written explanation
Specifically noted structure is achieved and obtained in book, claims and attached drawing.
Detailed description of the invention
Attached drawing is only used for showing the purpose of specific embodiment, and is not to be construed as limiting the invention, in entire attached drawing
In, identical reference symbol indicates identical component.
Fig. 1 is the present embodiment schematic diagram of gating system structure；
Fig. 2 is Fig. 1 tundish structure schematic diagram；
Fig. 3 is vacuum lid structural schematic diagram in Fig. 1；
Fig. 4 is nitrogen bus system structural schematic diagram in Fig. 1；
Wherein, 1- molten steel, 2- tundish, 3- vacuum lid, 4- ingot mould, 5- nitrogen bus system, 6- vacuum tank,
7- vaccum exhaust outlet, the first valve of 8-, 9- tundish core bar, 10- steam hose, 11- core bar hoisting mechanism, 12- nitrogen cylinder,
13- diversion pipe, the first gas bleeder valve of 14-, 15- pressure gauge, the second gas bleeder valve of 16-, 17- aeration aperture, 18- nitrogen cylinder group, 19- second
Valve, 20- metal steam hose, 21- gas bus bar.
Specific embodiment
Specifically describing the preferred embodiment of the present invention with reference to the accompanying drawing, wherein attached drawing constitutes the application a part, and
Together with embodiments of the present invention for illustrating the principle of the present invention.
The present embodiment provides a kind of control nitrogen running gate system of nitrogenous steel ingot, the system structure is as shown in Figure 1, include centre
Packet 2, vacuum lid 3, vacuum tank 6 and ingot mould 4, wherein molten steel 1 is placed in tundish 2, and ingot mould 4 is placed in vacuum tank 6
It is interior, it is all made of flanged joint between vacuum tank 6, vacuum lid 3 and tundish 2, is sealed each other by gravity, it is empty to form sealing
Between.
It is provided with vaccum exhaust outlet 7 on vacuum tank 6, passes through the external vacuum system of 7 vacuum tank of vaccum exhaust outlet 6
System, vacuum system vacuumize vacuum tank 6 by vaccum exhaust outlet 7, are placed in the ingot mould in vacuum tank 6 certain true
In reciprocal of duty cycle environment；The link position of vaccum exhaust outlet 7 and vacuum tank 6 is provided with the first valve 8, first valve 8
Opening and closing can be realized the connection for being switched on or off vacuum system Yu vacuum tank 6.
Aeration aperture 17 is provided on vacuum tank 6, aeration aperture 17 is connected with nitrogen bus system 5, nitrogen busbar connector system
System 5 can be filled with nitrogen into vacuum tank 6 by aeration aperture 17, so that the vacuum environment in vacuum tank 6 be made to form nitrogen
Atmosphere, thus guarantee that molten steel is poured under nitrogen protection atmosphere, since nitrogen partial pressure is larger in the atmosphere in vacuum tank 6,
The partial pressure of oxygen and water is smaller, therefore in pouring molten steel, can effectively remove [H] element and [O] element in molten steel, simultaneously
Guarantee that [N] constituent content is constant in molten steel.
Pressure gauge 15 is additionally provided on vacuum tank 6, the vacuum inside display vacuum tank 6 that pressure gauge 15 can quantify
Degree becomes 15 show value according to pressure to control vacuum pumping and nitrogen bus system 5 of the vacuum system to vacuum tank 6
6 inflated with nitrogen of vacuum tank is operated.The second gas bleeder valve 16 is additionally provided on vacuum tank 6, for the extra of vacuum tank 6 to be discharged
Gas.The present embodiment is in order to guarantee that molten steel can be conducive to [H] element and [O] element in removing molten steel in casting process, simultaneously
The content for being able to maintain [N] element does not change, therefore it is 150Pa hereinafter, then filling again that vacuum degree is evacuated in vacuum tank 6
Enter nitrogen, makes the internal and external pressure balance of vacuum tank 6.
The bridge that connection vacuum tank 6 and tundish 2 is played between vacuum tank 6 and tundish 2 is arranged in vacuum lid 3
Effect guarantees that molten steel 1 is poured into during ingot mould 4 always in nitrogen protection atmosphere from tundish 2, to avoid molten steel 1
[H] element, [O] element and [N] element in air are absorbed in casting process.
As shown in figure 3, being provided with diversion pipe 13 on vacuum lid 3, diversion pipe 13 is arranged in vacuum cover 3 structure of vacuum lid
Among body 3, and up and down to the upper and lower surface of diversion pipe 13, the upper end opening of diversion pipe 13 connects the tapping of tundish 2
Mouthful, what the lower ending opening of diversion pipe 13 corresponded to ingot mould 4 pours steel mouth, and such molten steel 1 is directly over very from the tapping hole of tundish 2
Diversion pipe 13 on empty lid 3 is poured into ingot mould 4, ensure that molten steel 1 from start to finish in the protective atmosphere of nitrogen.Vacuum cover
The first gas bleeder valve 14 is additionally provided on body 3, for gas in vacuum lid 3 to be discharged.
As shown in Fig. 2, having tundish core bar 9, tundish core bar 9 can be inserted in the tapping hole 2 structure of tundish,
When intermediate cored bar 9 injects in the tapping hole, tapping hole can be closed, molten steel is prevented to flow out, when intermediate cored bar 9 is taken out
Out when the tapping hole, molten steel is flowed out from tapping hole；Core bar hoisting mechanism 11, core bar elevator are additionally provided on tundish 2
Structure 11 is connect with tundish core bar 9, and control tundish core bar 9 is gone up and down, to control the opening and closing of tapping hole.Intermediate cored
Bar 9 is the rod-like structure with upper lower through-hole, is connected with steam hose 10 in the upper end of tundish core bar 9, steam hose 10
The other end connects nitrogen cylinder 12, and nitrogen cylinder 12 provides nitrogen, enters tundish core bar 9 by steam hose 10, then from centre
Cored bar 9 enters the diversion pipe 13 of vacuum lid 3, finally enters in vacuum tank 6, so the entire casting process of guarantee molten steel
In nitrogen protection atmosphere, while being conducive to keep stable nitrogen protection atmosphere in vacuum tank 6.
As shown in figure 4, having nitrogen cylinder group 18 and gas bus bar 21, gas converges the structure of nitrogen bus system 5
Stream comb 21 is connected to each nitrogen cylinder of nitrogen cylinder group 18, and then gas bus bar passes through metal steam hose 20 and vacuum
Aeration aperture 17 on tank body 6 connects, and can be filled with nitrogen into vacuum tank 6 by nitrogen bus system 5 in this way.In metal
The second valve 19 is provided on steam hose 20, controlled by the second valve of open or close 19 nitrogen bus system 5 to
Inflated with nitrogen in vacuum tank 6.
When being poured, tundish core bar 9 is inserted into tundish tapping hole first, tapping hole is closed, then opens
First valve 8 vacuumizes vacuum tank 6 by vacuum system, until pressure gauge 15 shows the vacuum degree in vacuum tank 6
Until reaching 150Pa or less, it is then shut off the first valve 8, stops the vacuum pumping to vacuum tank 6；Open the second valve
19, it is filled with nitrogen into vacuum tank 6 using nitrogen bus system 5, until pressure gauge 15 is shown as 0, i.e., inside and outside vacuum tank 6
Pressure balance is then shut off the second valve 19, stops being filled with nitrogen into vacuum tank 6；Using nitrogen cylinder 12 to intermediate cored
Nitrogen is filled in bar 9, then nitrogen is entered in vacuum tank 6 by diversion pipe 13；Then changed to tundish injection
Learn the molten steel 1 that Composition Control and chemical component have been met the requirements, when 1 liquid level of molten steel on tundish along 300-500mm
When, tundish core bar 9 is promoted using core bar hoisting mechanism 11, tundish core bar 9 is made to leave tapping hole, then molten steel 1 is from tapping
Mouth outflow, is cast in ingot mould 4 by diversion pipe 13, until pouring molten steel is completed；Then tundish 2 and vacuum lid are hung away
3, molten steel natural coagulation is cooling, ultimately forms steel ingot.Due to being poured under nitrogen protection atmosphere always in molten steel, can effectively take off
Except [H] element in molten steel and [O] element, and [N] constituent content can be maintained.
Embodiment 1:
Firstly, according to injection system structure, as shown in Figure 1, installing each facility.Including tundish 2, vacuum lid 3, vacuum
Tank body 6 and ingot mould 4, wherein molten steel 1 is placed in tundish 2, and ingot mould 4 is placed in vacuum tank 6, vacuum tank 6, vacuum cover
It is all made of flanged joint between body 3 and tundish 2, is sealed each other by gravity, forms sealing space.
Second step carries out Composition Control with molten steel to casting, and pour steel does not adjust in molten steel [N] constituent content, casting
The final elemental gas content of molten steel is as follows: [H]=0.00022%, [O]=0.0049%, [N]=0.0060%.
Third step is opened the first valve 8, is vacuumized by vacuum system to vacuum tank 6, vacuum degree reaches
70Pa closes the first valve 8；The second valve 19 is opened, is filled with nitrogen into vacuum tank 6 using nitrogen bus system 5, until
Pressure gauge 15 is shown as 0, i.e. 6 internal and external pressure balance of vacuum tank, is then shut off the second valve 19, stops into vacuum tank 6
It is filled with nitrogen.
4th step is filled with nitrogen into tundish core bar 9 using nitrogen cylinder 12, and then nitrogen is entered true by diversion pipe 13
In slack tank body 6；Then the molten steel that chemical Composition Control and chemical component have been met the requirements has been carried out to tundish injection
1.When molten steel 1 liquid level on tundish along 300-500mm when, promote tundish core bar 9 using core bar hoisting mechanism 11, make
Between cored bar 9 leave tapping hole, then molten steel 1 is flowed out from tapping hole, is cast in ingot mould 4 by diversion pipe 13, until steel
Water casting complete.
After ingot solidification, chemical component detection is carried out to steel ingot, wherein [H]=0.0001%, [O]=0.0040%, [N]
=0.0112%.
Embodiment 2:
Firstly, according to injection system structure, as shown in Figure 1, installing each facility.Including tundish 2, vacuum lid 3, vacuum
Tank body 6 and ingot mould 4, wherein molten steel 1 is placed in tundish 2, and ingot mould 4 is placed in vacuum tank 6, vacuum tank 6, vacuum cover
It is all made of flanged joint between body 3 and tundish 2, is sealed each other by gravity, forms sealing space.
Second step carries out Composition Control with molten steel to casting, and pour steel adjusts [N] constituent content in molten steel, is poured steel
The final elemental gas content of water is as follows: [H]=0.00016%, [O]=0.0042%, [N]=0.0347%.
Third step is opened the first valve 8, is vacuumized by vacuum system to vacuum tank 6, vacuum degree reaches
150Pa closes the first valve 8；The second valve 19 is opened, is filled with nitrogen into vacuum tank 6 using nitrogen bus system 5,
It is shown as 0, i.e. 6 internal and external pressure balance of vacuum tank to pressure gauge 15, the second valve 19 is then shut off, stops to vacuum tank 6
Inside it is filled with nitrogen.
4th step is filled with nitrogen into tundish core bar 9 using nitrogen cylinder 12, and then nitrogen is entered true by diversion pipe 13
In slack tank body 6；Then the molten steel that chemical Composition Control and chemical component have been met the requirements has been carried out to tundish injection
1.When molten steel 1 liquid level on tundish along 300-500mm when, promote tundish core bar 9 using core bar hoisting mechanism 11, make
Between cored bar 9 leave tapping hole, then molten steel 1 is flowed out from tapping hole, is cast in ingot mould 4 by diversion pipe 13, until steel
Water casting complete.
After ingot solidification, to steel ingot carry out chemical component detection, wherein [H]=0.00012%, [O]=0.0030%,
[N]=0.0423%.
Embodiment 3:
When being poured ultra supercritical rotor steel ingot, ultra supercritical rotor steel ingot requires [H] constituent content in molten steel to be less than or equal to
0.00015%, [O] constituent content is less than or equal to 0.0030%, and [N] constituent content is 0.045-0.060%.
Firstly, according to injection system structure, as shown in Figure 1, installing each facility.Including tundish 2, vacuum lid 3, vacuum
Tank body 6 and ingot mould 4, wherein molten steel 1 is placed in tundish 2, and ingot mould 4 is placed in vacuum tank 6, vacuum tank 6, vacuum cover
It is all made of flanged joint between body 3 and tundish 2, is sealed each other by gravity, forms sealing space.
Second step carries out Composition Control with molten steel to casting, and pour steel adjusts [N] constituent content in molten steel, is poured steel
The final elemental gas content of water is as follows: [H]=0.00015%, [O]=0.0028%, [N]=0.0470%.
Third step is opened the first valve 8, is vacuumized by vacuum system to vacuum tank 6, vacuum degree reaches
100Pa closes the first valve 8；The second valve 19 is opened, is filled with nitrogen into vacuum tank 6 using nitrogen bus system 5,
It is shown as 0, i.e. 6 internal and external pressure balance of vacuum tank to pressure gauge 15, the second valve 19 is then shut off, stops to vacuum tank 6
Inside it is filled with nitrogen.
4th step is filled with nitrogen into tundish core bar 9 using nitrogen cylinder 12, and nitrogen enters vacuum tank by diversion pipe 13
In body 6；Then the molten steel 1 that chemical Composition Control and chemical component have been met the requirements has been carried out to tundish injection.When
1 liquid level of molten steel on tundish along 300-500mm when, using core bar hoisting mechanism 11 promoted tundish core bar 9, make tundish
Core bar 9 leaves tapping hole, and then molten steel 1 is flowed out from tapping hole, is cast in ingot mould 4 by diversion pipe 13, until molten steel pours
Note is completed.
After ingot solidification, to steel ingot carry out chemical component detection, wherein [H]=0.00013%, [O]=0.0023%,
[N]=0.0540%.
In conclusion passing through guarantee the embodiment of the invention provides a kind of control nitrogen pouring procedure of nitrogenous steel ingot and system
The stable nitrogen protection atmosphere of casting process, it is effective to remove [H] element and [O] element in molten steel, while guaranteeing in molten steel [N]
Content remains unchanged.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.
Claims (7)
1. a kind of control nitrogen pouring procedure of nitrogenous steel ingot characterized by comprising
Firstly, ingot mould is put into vacuum tank, it is evacuated to after vacuum degree is 150Pa or less and is filled with nitrogen, make the vacuum
Tank body internal and external pressure balance；
Secondly, being filled with nitrogen into tundish core bar, the vacuum tank is then entered by tundish core bar lower end；
Secondly, the molten steel for having been carried out chemical Composition Control is injected the tundish, the tundish core bar is promoted, by molten steel
Under nitrogen protection atmosphere by the basket pouring into the ingot mould, solidification cooling forms steel ingot；
The running gate system of control nitrogen pouring procedure for executing the nitrogenous steel ingot include: vacuum tank (6), be placed in it is described true
Ingot mould (4) in slack tank body (6) and the tundish (2) being placed in above the vacuum tank (6)；
Wherein, the tapping hole of the tundish (2) is connected to the steel mouth that pours of the ingot mould (4), guarantees molten steel from the centre
It wraps in tapping hole injection ingot mould (4) of (2)；
Tundish core bar (9) upper end is connected with nitrogen cylinder (12), guarantees molten steel under nitrogen protection atmosphere from tundish (2)
Tapping hole injection ingot mould (4) in；
The vacuum tank (6) is connected with vacuum system and nitrogen bus system (5)；
Gas bleeder valve (16) are provided on the vacuum tank (6)；
It is provided between the vacuum tank (6) and the tundish (2) vacuum lid (3), the vacuum tank (6), vacuum
It is all made of flanged joint between lid (3) and tundish (2), is sealed each other by gravity, sealing space is formed；
In atmosphere in the vacuum tank (6), nitrogen partial pressure is greater than the partial pressure of water and oxygen；
There is diversion pipe (13) up and down, diversion pipe (13) upper end and the tundish in the vacuum lid (3)
(2) tapping hole is connected to, and diversion pipe (13) lower end is connected to the steel mouth that pours of the ingot mould (4)；
Pressure gauge (15) are provided on the vacuum tank (6)；
Valve (8,19) are provided between the vacuum tank (6) and the vacuum system, nitrogen bus system (5)；
Gas bleeder valve (14) are provided on the vacuum lid (3)；
The nitrogen bus system (5) has nitrogen cylinder group (18) and is connected to each nitrogen cylinder of the nitrogen cylinder group (18)
Gas bus bar (21).
2. a kind of running gate system for the control nitrogen pouring procedure for requiring the 1 nitrogenous steel ingot for perform claim, which is characterized in that packet
It includes: vacuum tank (6), the ingot mould (4) being placed in the vacuum tank (6) and being placed in above the vacuum tank (6)
Tundish (2)；
Wherein, the tapping hole of the tundish (2) is connected to the steel mouth that pours of the ingot mould (4), guarantees molten steel from the centre
It wraps in tapping hole injection ingot mould (4) of (2)；
Tundish core bar (9) upper end is connected with nitrogen cylinder (12), guarantees molten steel under nitrogen protection atmosphere from tundish (2)
Tapping hole injection ingot mould (4) in；
The vacuum tank (6) is connected with vacuum system and nitrogen bus system (5)；
Gas bleeder valve (16) are provided on the vacuum tank (6).
3. running gate system according to claim 2, which is characterized in that between the vacuum tank (6) and the tundish (2)
It is provided with vacuum lid (3), the interior diversion pipe (13) having up and down of the vacuum lid (3), on the diversion pipe (13)
End is connected to the tundish (2) tapping hole, and diversion pipe (13) lower end is connected to the steel mouth that pours of the ingot mould (4).
4. the running gate system according to Claims 2 or 3, which is characterized in that be provided with pressure gauge on the vacuum tank (6)
(15)。
5. running gate system according to claim 4, which is characterized in that the vacuum tank (6) and the vacuum system, nitrogen
Valve (8,19) are provided between bus system (5).
6. running gate system according to claim 3, which is characterized in that be provided with gas bleeder valve (14) on the vacuum lid (3).
7. running gate system according to claim 2, which is characterized in that the nitrogen bus system (5) has nitrogen cylinder group
(18) and with each nitrogen cylinder of the nitrogen cylinder group (18) the gas bus bar (21) being connected to.
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| CN111593247B (en) * | 2020-05-21 | 2021-04-13 | 中冶东方工程技术有限公司 | Remelting and encrypting method and system for nitrided alloy |
| CN115612910B (en) * | 2021-07-16 | 2023-11-14 | 天津重型装备工程研究有限公司 | Nitrogen-controlled stainless steel smelting ingot casting method for ultra-supercritical steam turbine rotor |
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