CN110396571A - A kind of method of deoxidation of steel alloy vacuum induction furnace smelting - Google Patents
A kind of method of deoxidation of steel alloy vacuum induction furnace smelting Download PDFInfo
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- CN110396571A CN110396571A CN201910635779.7A CN201910635779A CN110396571A CN 110396571 A CN110396571 A CN 110396571A CN 201910635779 A CN201910635779 A CN 201910635779A CN 110396571 A CN110396571 A CN 110396571A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
Abstract
The invention belongs to field of metallurgy, and in particular to a kind of method of deoxidation of steel alloy vacuum induction furnace smelting.One, raw material preparation；Two, it feeds: carbon block raw material being placed in crucible bottom, adds metallic nickel, metal molybdenum and pure iron；Three, it smelts: closing stove evacuation, is completely melt raw material in furnace to electricity；Steel temperature is promoted to refining temperature, carbon block is added, into refining period；Low frequency stirring is opened, the abundant deoxidation of melt in vacuum drying oven is made；The later period is refined, is added loaded on the calcium metal in nickel box, improves power of agitator after addition；Then manganese metal, metallic copper adjusting component ratio is added in argon filling；It is eventually adding nickel magnesium alloy, carries out final deoxidizing；Four, it taps: and thermometric is sampled, casting tapping；Solid welding has pure iron plate or pure iron block on the outer surface of the nickel box.The more traditional method of deoxidation of the application method uses deoxidier less varieties, and method is easy and deoxidation effect is good, and qualified good 9Ni steel alloy can be made.
Description
Technical field
The invention belongs to field of metallurgy, and in particular to a kind of method of deoxidation of steel alloy vacuum induction furnace smelting.
Background technique
9Ni is a kind of low-carbon medium alloy steel, and tissue is martensite and bainite.The steel grade is mainly characterized by high-purity
Degree, high intensity, high low-temperature impact toughness, good welds performance etc..There is good toughness and more high-strength under extremely low temperature
Degree, and have the characteristics that coefficient of thermal expansion is small compared with austenitic stainless steel and aluminium alloy, it is minimum up to 1 using temperature
DEG C, mainly for the manufacture of industries such as liquefied natural gas (LNG) storage tank and ships that transports.9Ni standard is as follows:
9Ni steel alloy is special because its use environment, requires the control of residual elements high, especially gas content: H≤
1ppm, O≤15ppm, N≤20ppm.The principal element of the influence common steel product oxygen content of vaccum sensitive stove has following several: adding
The type and additional amount of killing, the addition opportunity of deoxidier, the adding manner of deoxidier；The type of existing deoxidier and
Adding manner is such as: vaccum sensitive stove often mainly has five kinds of C, Si, Al, Ca, Ni-Mg with deoxidant element, and wherein C is that vacuum induction is molten
The essential element of change phase deoxidation, Si, Al, C are the essential elements of vacuum induction refining period deoxidation, and Ca, Ni-Mg are that vacuum induction goes out
Steel phase main deoxidant element.
High, Si≤0.05% is required because 9Ni steel alloy controls Si, Al content, Al≤0.005%, therefore according to tradition
Method for vacuum induction smelting, for guarantee 9Ni steel alloy quality when smelting 9Ni steel alloy refining period will be unable to add Si, Al
Two kinds of deoxidant elements, so that causing refining period to be unable to fully deoxidation will have an adverse effect to the final oxygen content of 9Ni product.Tradition
Method deoxidier directly add easily caused in molten steel part deoxidier just vapored away not in contact with molten steel cause deoxidier dosage increase
Increasing cost, deoxidation effect is uncontrollable simultaneously.It is waved since the volatile traditional deoxidier adding manner of deoxidier easily leads to deoxidier
It sends out too fast and causes the further deoxidation of 9Ni steel alloy insufficient.According to current traditional smelting process, 9Ni steel alloy oxygen content water
It puts down as 25-30ppm, is unable to satisfy product standard requirement.
Summary of the invention
The purpose of the present invention is providing a kind of method of deoxidation of 9Ni steel in vacuum induction furnace smelting regarding to the issue above,
This method cost is controllable, simple process and effect is obvious.
Above-mentioned technical purpose of the invention has the technical scheme that
A kind of method of deoxidation of steel alloy vacuum induction furnace smelting, includes the following steps:
One, raw material preparation: raw material includes pure iron, metallic nickel, metal molybdenum, manganese metal, metallic copper, carbon block, calcium metal, nickel magnesium alloy
With nickel box；
Two, it feeds: carbon block raw material being placed in crucible bottom, adds metallic nickel, metal molybdenum and pure iron；
Three, it smelts:
It closes stove evacuation, be completely melt raw material in furnace to electricity；
After reaction between carbon and oxygen in furnace is tranquil, thermometric is sampled；
Steel temperature is promoted to refining temperature, carbon block is added, into refining period, refining time >=60 minute；
Low frequency stirring is opened, the abundant deoxidation of melt in vacuum drying oven is made；
The later period is refined, is added loaded on the calcium metal in nickel box, is improved power of agitator after addition, made using nickel box and high-power stirring
Obtaining calcium metal and molten steel has enough times of contact, further deoxidation；
Then manganese metal, metallic copper adjusting component ratio is added in argon filling；
It is eventually adding loaded on the nickel magnesium alloy in nickel box, carries out final deoxidizing；
Four, it taps: and thermometric is sampled, casting tapping；
Solid welding has pure iron plate or pure iron block on the outer surface of the nickel box.
Final deoxidizing Elements C a is added by the tapping phase and is changed to the addition of refining later period by the application；To Ca, Ni-Mg by directly adding
Enter to be changed to be added by the way of welding nickel box.The overall co-ordination of the above method is obtained to substantially increase deoxidation effect
9Ni steel alloy oxygen content reaches standard.Part deoxidier is put into induction furnace again by the way of being packed into nickel box can guarantee deoxidation
Agent can come into full contact with carry out deoxidation with the molten steel penetrated into box before volatilization, improve deoxidation effectiveness and raw material utilization rate, save
Cost, and make the oxygen content of finished product more controllable.
Preferably, including: to derust to pure iron and metallic nickel in the preparation of the step 1, pure iron and metal are removed
Nickel surface oxide skin, and pure iron and metallic nickel are toasted, guarantee that drying enters furnace；Carbon block is broken into the small of diameter 1-2cm
Block；Nickel box is welded, calcium metal and nickel magnesium alloy are respectively charged into respective nickel box.
Preferably, matter of the carbon block being added in the step 2 by total oxygen content contained by carbon and pure iron as raw material, metallic nickel
Amount is placed in crucible bottom than 3:4-2:1 supplying；The weight that metallic nickel, metal molybdenum and pure iron are added in step 2 is respectively raw material
9.60%-10.00%, 0.08%-0.10% and 88.5-89.5% of total weight.
Preferably, closing stove evacuation in the step 3, vacuum degree to 20Pa or less turns high vacuum, vacuum degree to 1Pa
Below to electricity；Electrical power 200kw is initially given, is kept for the low-power material time at least 60 minutes, guarantees that raw material is abundant in vacuum drying oven
Deoxidation；By 100kw/ hours power per liter, up to 600kw, slow material, until furnace charge is completely melt；Promote steel Wen Zhijing
Guarantee vacuum degree≤1Pa in furnace after refining temperature.
Preferably, the nickel box include at least open top in cone integrally formed main cartridge and be welded in
The envelope cavity plate of main cartridge top opening opening, the diameter of the envelope cavity plate are less than the height of the main cartridge, the appearance of the main cartridge
Solid welding has pure iron block or pure iron plate on face.
Preferably, multiple diameters are at least offered on the nickel box on main cartridge less than calcium metal and nickel magnesium alloy particle
The inlet opening of block diameter.
Preferably, the outer surface lower part solid welding of the main cartridge has one or more branch for the main cartridge outer surface
Pure iron block or the main cartridge outer surface lower part post ground solid welding have cone pure iron plate, the main cartridge with it is described
Seal cavity plate spot welding connection.
The structure of above-mentioned nickel box makes deoxidier that can sufficiently contact progress deoxidation with molten steel before volatilization, and can guarantee deoxidation
Agent too fast will not all contact molten steel and add volatilization.
Preferably, the nickel box includes pushing up substrate, bottom to be oriented to sharp chambers with one or more downwardly convex formation
The side plate of side plate and be connected to end plate on the top substrate and side plate or between side plate, the end plate and the side plate it
Between be enclosed the sharp chamber of guiding, the nickel box includes one or more guiding point chambers communicated, the side plate, top substrate and end plate
Spot welding connection.
Preferably, it is small to offer multiple diameters on at least described side plate and end plate in the side plate, top substrate and end plate
In the inlet opening of calcium metal and nickel magnesium alloy particulate mass diameter.
Preferably, on the outer surface of the side plate and/or end plate solid welding have one or more branch for the nickel box outside
The pure iron block on surface；Or the pure iron plate that ground solid welding has cone, the pure iron are posted on the outer surface of the side plate and/or end plate
The position that plate corresponds to the inlet opening equally offers inlet opening.
Deoxidier, which directly adds in molten steel, easily causes part deoxidier just to vapor away not in contact with molten steel, using solubilized in steel
Nickel box in liquid can suitably slow down the evaporation rate of deoxidier, be placed in nickel box if also resulted in less into molten steel for a long time
The excessively high deoxidier of temperature just volatilizees there are no fully oxidized in box, so the application is using above-mentioned spot welding and opens some small feed liquors
The nickel box in hole, which can play, to be slowed down the speed of deoxidier oneself volatilization and can guarantee that molten steel is preceding sufficiently and molten steel in deoxidier volatilization again
Contact carries out deoxidation.
It since density relationship nickel box is difficult to sink in molten steel, but partly floats on molten steel face, cooperation pair in deoxidation process
The agitating function of molten steel carries out better deoxidation.And using the nickel box of above-mentioned specific shape, due to gravity and centre-of-gravity principle, so that
Nickel box relatively protrusion conehead or guiding nose part all penetrate in molten steel downwards substantially, in deoxidier also focus on conehead and
Guiding point is intracavitary, then cooperates spot welding rather than full weldering, the mode that lower part drives fluid apertures into and pure iron of burn-oning on nickel box is aggravated
Sink to the deoxidier in nickel box and box in molten steel as much as possible so that deoxidier sink to as much as possible in molten steel with steel
Liquid comes into full contact with carry out deoxidation and also improves deoxidation effect to substantially increase the controllability of deoxidation materials and deoxidation effect.
Nickel box can also use common square pattern, and the effect that only mode pattern sinks to molten steel is relatively free of above-mentioned
Structure is good, and deoxidier is used without good using the effect of above-mentioned nickel box in box.The structure that the downward point of nickel box comes out is not limited to
In above structure mode, if guarantee Chemical Components of Liquid Steel and finished product under the premise of make as much as possible nickel tape deoxidier sink to steel
In liquid all can, downwards point go out and guarantee as far as possible nickel box dash forward tip be divided into it is close with nickel box center of gravity make it is prominent sharp downward all
It can.
Iron block outside nickel box can be Suresh Kumar, penetrate in molten steel as much as possible as long as being conducive to nickel box.In conclusion this
Invention has the advantages that
1, final deoxidizing Elements C a is added by the tapping phase and is changed to the addition of refining later period by the application；To Ca, Ni-Mg by being directly added into
It is changed to be added by the way of welding nickel box.The overall co-ordination of the above method is to substantially increase deoxidation effect, 9Ni obtained
Steel alloy oxygen content reaches standard.Part deoxidier is put into induction furnace again by the way of being packed into nickel box can guarantee that deoxidier exists
Carry out deoxidation can be come into full contact with the molten steel penetrated into box before volatilization, improve deoxidation effectiveness and raw material utilization rate, save the cost,
And make the oxygen content of finished product more controllable.
2, the application nickel box cooperates spot welding rather than welds entirely, lower part drives fluid apertures into and pure iron of burn-oning on nickel box adds
The mode of weight sinks to the deoxidier in nickel box and box in molten steel as much as possible, so that deoxidier sinks to steel as much as possible
Carry out deoxidation is come into full contact with molten steel in liquid to also improve to substantially increase the controllability of deoxidation materials and deoxidation effect
Deoxidation effect.,
3, the more traditional method of deoxidation of the application method uses deoxidier less varieties, and method is easy and deoxidation effect is good, can be made
Qualified good 9Ni steel alloy.
Detailed description of the invention
Fig. 1 is two nickel box structure schematic diagram of embodiment.
Fig. 2 is two nickel box outside weld pure iron plate structural schematic diagram of embodiment.
Fig. 3 is two nickel box outside weld pure iron block structure schematic diagram of embodiment.
Fig. 4 is three nickel box outside weld pure iron plate structural schematic diagram of embodiment.
Fig. 5 is three nickel box side structure schematic diagram of embodiment.
Fig. 6 is three nickel box outside weld pure iron block structure schematic diagram of embodiment.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
Embodiment one:
A kind of method of deoxidation of steel alloy vacuum induction furnace smelting, includes the following steps:
One, raw material preparation: raw material includes pure iron, metallic nickel, metal molybdenum, manganese metal, metallic copper, carbon block, calcium metal, nickel magnesium alloy
With nickel box；
Two, it feeds: carbon block raw material being placed in crucible bottom, adds metallic nickel, metal molybdenum and pure iron；
Three, it smelts:
It closes stove evacuation, be completely melt raw material in furnace to electricity；
After reaction between carbon and oxygen in furnace is tranquil, thermometric is sampled；
Steel temperature is promoted to refining temperature, and according to target carbon block is added in value, into refining period, refining time >=60 minute；
Low frequency stirring is opened, power 150kw stirs 60 minutes, makes the abundant deoxidation of melt in vacuum drying oven；
The later period is refined, is added loaded on the calcium metal in nickel box, power of agitator is improved after addition and is stirred 5 minutes to 500kw, nickel is used
Box and high-power stirring are so that calcium metal and molten steel have enough times of contact, further deoxidation；
Then manganese metal, metallic copper molten steel adjusting component ratio is added in argon filling；
It is eventually adding loaded on the nickel magnesium alloy in nickel box, carries out final deoxidizing.
Four, it taps: and thermometric is sampled, casting tapping；
Solid welding has pure iron plate or pure iron block on the outer surface of the nickel box.
Final deoxidizing Elements C a is added by the tapping phase and is changed to the addition of refining later period by the application；To Ca, Ni-Mg by directly adding
Enter to be changed to be added by the way of welding nickel box.The overall co-ordination of the above method is obtained to substantially increase deoxidation effect
9Ni steel alloy oxygen content reaches standard.Part deoxidier is put into induction furnace again by the way of being packed into nickel box can guarantee deoxidation
Agent can come into full contact with carry out deoxidation with the molten steel penetrated into box before volatilization, improve deoxidation effectiveness and raw material utilization rate, save
Cost, and make the oxygen content of finished product more controllable.
Include: to derust to pure iron and metallic nickel in the preparation of the step 1, removes pure iron and metallic nickel Surface Oxygen
Change skin, and pure iron and metallic nickel are toasted, guarantees that drying enters furnace；Carbon block is broken into the fritter of diameter 1-2cm；Weld nickel
Calcium metal and nickel magnesium alloy are respectively charged into respective nickel box by box.The weight of nickel box about 20kg, the nickel magnesium being packed into box close
Gold about 16kg, the calcium about 3kg being packed into box.About 30 kg of weight of pure iron block or pure iron plate outside nickel box.The particle of nickel magnesium alloy
Diameter is 5-10mm.
The carbon block being added in the step 2 by total oxygen content contained by carbon and pure iron as raw material, metallic nickel mass ratio 3:4-
2:1 supplying is placed in crucible bottom；The weight that metallic nickel, metal molybdenum and pure iron are added in step 2 is respectively raw material gross weight
9.60%-10.00%, 0.08%-0.10% and 88.5-89.5%.Raw material includes pure iron, metallic nickel, metal molybdenum, manganese metal, metal
Copper, carbon block, calcium metal, nickel magnesium alloy and nickel box, wherein metallic nickel ratio does not include nickel content contained by nickel box and nickel magnesium alloy.
In the step 3, stove evacuation is closed, vacuum degree to 20Pa or less turns high vacuum, and vacuum degree to 1Pa or less is to electricity；
Electrical power 200kw is initially given, is kept for the low-power material time at least 60 minutes, guarantees the abundant deoxidation of raw material in vacuum drying oven；It presses
100kw/ hours power per liter, up to 600kw, slow material, until furnace charge is completely melt；After promoting steel temperature to refining temperature
Guarantee vacuum degree≤1Pa in furnace.
Embodiment two:
Unlike the embodiments above be in the nickel box includes the integrally formed main box in cone of at least open top
Body 1 and the envelope cavity plate 2 for being welded in main cartridge top opening opening, the diameter of the envelope cavity plate is less than the height of the main cartridge, described
Solid welding has pure iron block or pure iron plate on the outer surface of main cartridge.The diameter for sealing cavity plate is about 200 mm.
Multiple diameters are at least offered on the nickel box on main cartridge less than calcium metal and nickel magnesium alloy particulate mass diameter
Inlet opening 3.
The outer surface lower part solid welding of the main cartridge has one or more for the pure iron block of the main cartridge outer surface
4 or the outer surface lower part of the main cartridge post the pure iron plate 5 that ground solid welding has cone, the main cartridge and the envelope cavity plate
Spot welding connection.
The structure of above-mentioned nickel box makes deoxidier that can sufficiently contact progress deoxidation with molten steel before volatilization, and can guarantee deoxidation
Agent too fast will not all contact molten steel and add volatilization.
Embodiment three:
Unlike the embodiments above be in the nickel box includes pushing up substrate 6, bottom with one or more downwardly convex shapes
At the side plate 7 for being oriented to sharp chamber side plate and it is connected to the end plate 8 pushed up on substrate and side plate or between side plate, the end plate
It is enclosed the sharp chamber of guiding between the side plate, the nickel box includes one or more guiding point chambers communicated, the side plate,
Top substrate is connected with spot welding of end plate.
Offered on at least described side plate and end plate in the side plate, top substrate and end plate multiple diameters less than calcium metal and
The inlet opening 3 of nickel magnesium alloy particulate mass diameter.
Solid welding has one or more for the pure iron of the nickel box outer surfac on the outer surface of the side plate and/or end plate
Block 4；Or the pure iron plate 5 that ground solid welding has cone is posted on the outer surface of the side plate and/or end plate, the pure iron plate corresponds to institute
The position for stating inlet opening equally offers inlet opening.
Deoxidier, which directly adds, easily to be caused part deoxidier not in contact with molten steel in molten steel but vapors away, using solubilized in steel
Nickel box in liquid can suitably slow down the evaporation rate of deoxidier, be placed in nickel box if also resulted in less into molten steel for a long time
The excessively high deoxidier of temperature just volatilizees there are no fully oxidized in box, so the application is using above-mentioned spot welding and opens some small feed liquors
The nickel box in hole, which can play, to be slowed down the speed of deoxidier oneself volatilization and can guarantee that molten steel is preceding sufficiently and molten steel in deoxidier volatilization again
Contact carries out deoxidation.
It since density relationship nickel box is difficult to sink in molten steel, but partly floats on molten steel face, cooperation pair in deoxidation process
The agitating function of molten steel carries out better deoxidation.And using the nickel box of above-mentioned specific shape, due to gravity and centre-of-gravity principle, so that
Nickel box relatively protrusion conehead or guiding nose part all penetrate in molten steel downwards substantially, in deoxidier also focus on conehead and
Guiding point is intracavitary, then cooperates spot welding rather than full weldering, the mode that lower part drives fluid apertures into and pure iron of burn-oning on nickel box is aggravated
Sink to the deoxidier in nickel box and box in molten steel as much as possible so that deoxidier sink to as much as possible in molten steel with steel
Liquid comes into full contact with carry out deoxidation and also improves deoxidation effect to substantially increase the controllability of deoxidation materials and deoxidation effect.
Example IV:
It is unlike the embodiments above to be in using 6T vacuum induction furnace smelting 9Ni steel alloy, the specific steps are as follows:
1, preparation
Pure iron, metallic nickel are derusted, baking is handled；C block is broken into 1-2cm fritter；The nickel box that Ca, Ni-Mg are used
It is welded；
2, ingredient
3, C block is placed in crucible bottom, is sequentially added into Mo, Ni, Fe；
4, it closes furnace to evacuate, turns high vacuum after vacuum degree to 18Pa, be evacuated to after vacuum degree is 0.85Pa to electricity, give electrical power 200kw,
It is kept for 65 minutes；
5, power per liter keeps the power material by 600kw is risen to after 100kw/ hours, 4 hours, until furnace charge is completely melt；
6, after reaction between carbon and oxygen in furnace is tranquil, sampling, thermometric promotes temperature to 1583 DEG C, and 1.46kg carbon is added, into refining
Phase, during refining vacuum degree be 0.13-0.19Pa, refining time 70 minutes；
7, it is stirred during refining using low-power, power 150kw, mixing time 70 minutes；
8,3.18kgCa is added in the refining later period, is added using nickel box, and is stirred using high power, power of agitator 500kw, when stirring
Between 12 minutes, further degassing；
9, refining terminates, and pressure reaches 8100Pa in applying argon gas to furnace, first plus Mn 37.15kg, Cu 7.25kg, and is tailored into again
Point；
10, sampling confirmation ingredient is added Ni-Mg alloy 16.763kg after ingredient is qualified, is added using nickel box；
11, finished product sample is taken, thermometric, 1596 DEG C, casting is tapped.
A furnace 9Ni steel alloy is smelted by above-mentioned steps, oxygen content 7ppm meets product standard requirement.
Embodiment five:
It is unlike the embodiments above to be in using 6T vacuum induction furnace smelting 9Ni steel alloy, the specific steps are as follows:
1, preparation
Pure iron, metallic nickel are derusted, baking is handled；C block is broken into 1-2cm fritter；The nickel box that Ca, Ni-Mg are used
It is welded；
2, ingredient
3, C block is placed in crucible bottom, is sequentially added into Mo, Ni, Fe；
4, it closes furnace to evacuate, turns high vacuum after vacuum degree to 17Pa, be evacuated to after vacuum degree is 0.90Pa to electricity, give electrical power 200kw,
It is kept for 60 minutes；
5, power per liter keeps the power material by 600kw is risen to after 100kw/ hours, 4 hours, until furnace charge is completely melt；
6, after reaction between carbon and oxygen in furnace is tranquil, sampling, thermometric promotes temperature to 1578 DEG C, and 1.66kg carbon is added, into refining
Phase, during refining vacuum degree be 0.28-0.40Pa, refining time 63 minutes；
7, it is stirred during refining using low-power, power 150kw, mixing time 63 minutes；
8, the refining later period adds Ca 3.18kg, is added using nickel box, and is stirred using high power, power of agitator 500kw, when stirring
Between 15 minutes, further degassing；
9, refining terminates, pressure 7756Pa in applying argon gas to furnace, first plus Mn 37.66kg, Cu 6.95kg, and finely tunes ingredient again；
10, sampling confirmation ingredient is added Ni-Mg alloy 16.763kg after ingredient is qualified, is added using nickel box；
11, finished product sample is taken, thermometric, 1600 DEG C, casting is tapped.
A furnace 9Ni steel alloy is smelted by above-mentioned steps, oxygen content 8ppm meets product standard requirement.
Claims (10)
1. a kind of method of deoxidation of steel alloy vacuum induction furnace smelting, characterized by the following steps:
One, raw material preparation: raw material includes pure iron, metallic nickel, metal molybdenum, manganese metal, metallic copper, carbon block, calcium metal, nickel magnesium alloy
With nickel box；
Two, it feeds: carbon block raw material being placed in crucible bottom, adds metallic nickel, metal molybdenum and pure iron；
Three, it smelts:
It closes stove evacuation, be completely melt raw material in furnace to electricity；
After reaction between carbon and oxygen in furnace is tranquil, thermometric is sampled；
Steel temperature is promoted to refining temperature, and according to target carbon block is added in value, into refining period, refining time >=60 minute；
Low frequency stirring is opened, the abundant deoxidation of melt in vacuum drying oven is made；
The later period is refined, is added loaded on the calcium metal in nickel box, is improved power of agitator after addition, made using nickel box and high-power stirring
Obtaining calcium metal and molten steel has enough times of contact, further deoxidation；
Then manganese metal, metallic copper adjusting component ratio is added in argon filling；
It is eventually adding loaded on the nickel magnesium alloy in nickel box, carries out final deoxidizing；
Four, it taps: and thermometric is sampled, casting tapping；
Solid welding has pure iron plate or pure iron block on the outer surface of the nickel box.
2. a kind of method of deoxidation of steel alloy vacuum induction furnace smelting according to claim 1, it is characterised in that: the step
Include: to derust to pure iron and metallic nickel in one preparation, removes pure iron and metallic nickel surface scale, and to pure iron and gold
Belong to nickel to be toasted, guarantees that drying enters furnace；Carbon block is broken into the fritter of diameter 1-2cm；Nickel box is welded, by calcium metal and nickel magnesium
Alloy is respectively charged into respective nickel box.
3. a kind of method of deoxidation of steel alloy vacuum induction furnace smelting according to claim 1, it is characterised in that: the step
The carbon block being added in two is placed in crucible bottom by mass ratio 3:4-2:1 supplying of total oxygen content contained by carbon and pure iron as raw material, metallic nickel
Portion；The weight that metallic nickel, metal molybdenum and pure iron are added in step 2 is respectively 9.60%-10.00%, 0.08%- of raw material gross weight
0.10% and 88.5-89.5%.
4. a kind of method of deoxidation of steel alloy vacuum induction furnace smelting according to claim 1, it is characterised in that: the step
In three, stove evacuation is closed, vacuum degree to 20Pa or less turns high vacuum, and vacuum degree to 1Pa or less is to electricity；Initially give electrical power
200kw is kept for the low-power material time at least 60 minutes, guarantees the abundant deoxidation of raw material in vacuum drying oven；Function was risen by 100kw/ hours
Rate, highest can rise to 600kw, slow material, until furnace charge is completely melt；Guarantee vacuum in furnace after promoting steel temperature to refining temperature
Degree≤1Pa.
5. a kind of method of deoxidation of steel alloy vacuum induction furnace smelting according to claim 1, it is characterised in that: the nickel box
What it is including at least open top is in the integrally formed main cartridge (1) of cone and the envelope cavity plate for being welded in main cartridge top opening opening
(2), the diameter of the envelope cavity plate is less than the height of the main cartridge, and solid welding has pure iron block or pure on the outer surface of the main cartridge
Iron plate.
6. a kind of method of deoxidation of steel alloy vacuum induction furnace smelting according to claim 5, it is characterised in that: the nickel box
On the inlet opening (3) that multiple diameters are less than calcium metal and nickel magnesium alloy particulate mass diameter is at least offered on main cartridge.
7. a kind of method of deoxidation of steel alloy vacuum induction furnace smelting according to claim 6, it is characterised in that: the main box
The outer surface lower part solid welding of body has one or more for the pure iron block (4) of the main cartridge outer surface or the main cartridge
Outer surface lower part post the pure iron plate (5) that ground solid welding has cone, the main cartridge connect with the envelope cavity plate spot welding.
8. a kind of method of deoxidation of steel alloy vacuum induction furnace smelting according to claim 1, it is characterised in that: the nickel box
Side plate (7) and the connection that including top substrate (6), bottom there are one or more downwardly convex formation to be oriented to sharp chamber side plate
In the end plate (8) on the top substrate and side plate or between side plate, guiding point is enclosed between the end plate and the side plate
Chamber, the nickel box include one or more guiding point chambers communicated, and the side plate, top substrate are connected with spot welding of end plate.
9. a kind of method of deoxidation of steel alloy vacuum induction furnace smelting according to claim 9, it is characterised in that: the side
Multiple diameters are offered less than calcium metal and nickel magnesium alloy particulate mass on at least described side plate and end plate in plate, top substrate and end plate
The inlet opening (3) of diameter.
10. a kind of method of deoxidation of steel alloy vacuum induction furnace smelting according to claim 8 or claim 9, it is characterised in that: described
Solid welding has one or more pure iron block (4) or described for the nickel box outer surfac on the outer surface of side plate and/or end plate
The pure iron plate (5) that ground solid welding has cone is posted on the outer surface of side plate and/or end plate；The pure iron plate corresponds to the inlet opening
Position equally offer inlet opening.
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