CN105018669B - A kind of production method of nuclear power ingot iron - Google Patents
A kind of production method of nuclear power ingot iron Download PDFInfo
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Abstract
The invention discloses a kind of production method of nuclear power ingot iron, which is carried out taking off Mn, P at the beginning of molten iron by blast-melted after pretreatment desulfurizing, then through AOD converter, obtains half steel water of low P, S；Half steel water is refined through BOF converter smelting, LF stove, and then molten steel carries out vacuum decarburization, deoxidation treatment through RH stove, you can obtain described ingot iron molten steel.This method need not increase equipment and investment, making full use of existing equipment carries out process combination, according to metallurgical theory, metallurgical process is rationally controlled using AOD furnace, LF RH stove, achieve the purpose that advanced industrial pure iron is produced using common ore, also meet Nuclear Power Industry user for melting the demand of casting.The present invention had both been reduced ingot iron cost and had met user's needs in the case of iron and steel situation is increasingly serious, was also enterprise's Strategies of Promoting status, is constantly occupied high-end customer and is provided guarantee.
Description
Technical field
The invention belongs to smelting iron and steel production technical field, especially a kind of production method of nuclear power ingot iron.
Background technology
Ingot iron is the important materials of Nuclear Power Industry founding forging, possesses low-carbon (LC), low-phosphorous, low-sulfur, the feature of low aluminium,
Midium-carbon steel is used as flux in smelting, and which is also used as the extraordinary gold such as low carbon stainless steel, powder metallurgy, amorphous alloy
The basic material of category material.
Ingot iron is extremely low due to its carbon content, and therefore converter is using non-deoxidation tapping, Dephosphorization, the thermodynamics of desulfurization
Condition is different, it is also desirable to which different process is realized.Existing smelting process adopts first furnace（Converter or electric arc furnaces）+ vacuum drying oven
Process route, as tapping temperature is higher, the easy rephosphorization of molten steel, sulphur.And this technique is higher for material condition requirement, needs to adopt
Produced with low manganese raw material；Simultaneously because producing according to billet caster in steel, casting wadding stream situation is difficult to avoid that.
International rolled steel market deteriorated in recent years, how to produce ingot iron using common raw material, how using billet continuous casting
Half boiling steel is produced, reduces cost of material and production cost, the production of ingot iron is supported, be one and urgently to be resolved hurrily ask
Topic.
Content of the invention
The technical problem to be solved in the present invention is to provide a kind of production method of the nuclear power ingot iron of low cost, with
To high cleanliness, the ingot iron of low impurity.
For solving above-mentioned technical problem, the technical solution used in the present invention is：Which will be blast-melted de- by pretreatment
After sulphur, then carry out Mn, P being taken off at the beginning of molten iron through AOD converter, obtain half steel water of low P, S；Half steel water is through BOF converter smelting
Refining, the refining of LF stove, then molten steel carries out vacuum decarburization, deoxidation treatment through RH stove, you can obtain described ingot iron molten steel.
Further, the method for the invention step is：（1）Blast-melted process through blowing magnesium carries out desulfurization, makes molten iron
Middle S≤0.006wt%；
（2）Molten iron after desulfurization is tentatively taken off Mn, P operation using AOD furnace；
（3）Half steel water is smelted after being blended into BOF converter, and in tapping molten steel, composition by weight percent is：C≤
0.04%, P≤0.007%, S≤0.006%；Converter finishing slag dual alkalinity is 3～4；Lime top slag 2 is added during tapping into ladle
～3kg/T, argon gas strong mixing；
（4）The tapping molten steel of BOF converter enters the refining of LF stove, plus 2～4kg/T of desulfurization lime heats up, it is warming up to 1640～
1660 DEG C, argon gas strong mixing；Heating is finished to be carried out determining oxygen operation, closes Ladle Bottom and blows, and adds refining ladle slag on the top of the slag
Modification agent, and add aluminum shot to carry out deoxidation；Refining ladle slag modifier is carried out heating 1～2 minute after adding, slag finishing slag basicity control
System 10～15；
（5）The tapping molten steel of LF stove is transported to RH stove and carries out Decarburization Operation, and after entering the station, circulation determines oxygen in 3 minutes；Using OB technique
Decarburization is carried out, OB adopts full pumping application of vacuum after starting, below minimum vacuum degree control 120pa；After OB terminates, close from RH stove
Golden hopper adds little particle lime stone to carry out carbonization treatment, controls decarburization circulation time >=8 minute, and decarburization terminates to determine oxygen；
（6）After decarburization terminates, using aluminum shot deoxidation；
（7）After steel treatment deoxidation treatment, upper conticaster casting, molten steel composition mass percent：C≤0.0030%, S, P
≤ 0.006%, Al≤0.0050%, remaining is Fe and inevitable impurity.
Further, step of the present invention（2）In, the composition after taking off Mn, P in half steel water of gained includes：C
3.0～3.5wt%, Mn ＜ 0.10wt%, S≤0.006wt%, P≤0.040wt%, Si≤0.01wt%.
Further, step of the present invention（4）In, the Ingredients Weight content of refining ladle slag modifier is：CaO
20～28%, Al2O323～30%, SiO22～8%, S 0～0.15%, P 0～0.05%, Al 37～43%；Refining ladle slag changes
The addition of matter agent is 3kg/T.
The step（4）In, on the basis of determining oxygen value 450pppm according to molten steel, plus aluminum amount is：[65+([O]-450)/6]
kg；Often increase and decrease 60ppm oxygen content, aluminum shot addition increases and decreases 10kg.
The step（4）In, the bottom blowing flow that argon gas strong mixing is adopted is 100L/min～150L/min.
Further, step of the present invention（5）In, the oxygen amount of determining after entering the station is 200～400ppm.
The step（5）In：The lime stone of 2～5kg/T is added from alloy hopper.
Further, step of the present invention（6）In：Control for Oxygen Content leaving from station after aluminum shot deoxidation is in 20～35ppm；
Aluminum shot consumption is calculated by 10kg aluminum shot deoxidation 70ppm.
It is using the beneficial effect produced by technique scheme：Smelting process of the present invention utilizes AOD-BOF-LF-RH-
The process route of CCM can produce the pure iron steel grade of the high and low impurity of degree of purity；Using various existing metallurgical equipments according to de-
Sulphur, dephosphorization, demanganize, decarburization theory are designed, so as to reach the purpose for producing high-grade ingot iron using low price raw material.
The present invention need not increase equipment and investment, and making full use of existing equipment carries out process combination, according to metallurgical theory, adopts
Rationally control metallurgical process with AOD furnace, LF-RH stove, it is achieved that the purpose of advanced industrial pure iron is produced using common ore,
Also Nuclear Power Industry user is met for melting the demand of casting.The present invention both reduced in the case of iron and steel situation is increasingly serious
Ingot iron cost meets user's needs, is also enterprise's Strategies of Promoting status, constantly occupies high-end customer and provides and ensures.
Specific embodiment
With reference to specific embodiment, the present invention is further detailed explanation.
This nuclear power is as described below with the processing step of the production method of ingot iron：
（1）Blast-melted utilization magnesium injection processes desulfurization station carries out desulfurization operations, makes molten iron S≤0.006wt%, Ran Houtie
Water enters mixed iron blast.
（2）After mixed iron blast taps a blast furnace, Mn, P operation is tentatively taken off using AOD furnace resistance to material latter stage, now AOD furnace is due to right and wrong
The stainless steel production cycle, but resistance to material can be also used for carbon steel production, be consequently belonging to using waste and old resistance to material, low production cost.Obtain
Half steel water in composition：C 3.0～3.5wt%, Mn ＜ 0.10wt%, S≤0.006wt%, P≤0.040wt%, Si≤
0.01wt%.
（3）Half steel water of AOD furnace is smelted after being blended into BOF converter, the percentage by weight of composition in molten steel of tapping：C
≤ 0.04%, P≤0.007%, S≤0.006%；Converter finishing slag dual alkalinity is 3～4；Lime top slag is added during tapping into ladle
2～3kg/T, argon gas strong mixing.
（4）LF arrives at a station plus 2～4kg/T of desulfurization lime heats up, and is warming up to 1640～1660 DEG C；Argon gas strong mixing（Bottom blowing
Flow is 100L/min～150L/min）.Heating finishes and carries out determining oxygen operation, is uniformly sprinkled in batches on the top of the slag according to oxygen value is determined
Refining ladle slag modifier；Before adding refining ladle slag modifier, close Ladle Bottom and blow.Become in refining ladle slag modifier
Point weight content be：CaO 20～28%, Al2O323～30%, SiO22～8%, S 0～0.15%, P 0～0.05%, Al
37～43%.The addition of refining ladle slag modifier is 3kg/T, while adding aluminium on the basis of determining oxygen value 450pppm according to molten steel
Grain carries out deoxidation, plus aluminum amount is：[65+ ([O] -450)/6] kg, often increases and decreases 60ppm oxygen content, and aluminum shot addition increases and decreases 10kg；
Refining ladle slag modifier is carried out heating 1～2 minute after adding, slag finishing slag basicity control 10～15.
（5）Molten steel is transported to RH stove carries out Decarburization Operation, and after entering the station, circulation determines oxygen in 3 minutes（Enter stand control 200～
400ppm）；Depending on entering the station, oxygen degree determines OB technique（Decarburization is forced in oxygen blast）Blowing oxygen quantity, OB are adopted at full pumping vacuum after starting
Reason, below minimum vacuum degree control 120pa；After OB terminates, little particle 2～5kg/T of lime stone, control is added from RH alloy hopper
Decarburization circulation time >=8 minute, decarburization terminate to determine oxygen.
（6）After decarburization terminates, using aluminum shot deoxidation, Control for Oxygen Content leaving from station in 20～35ppm, by 10kg aluminum shot deoxidation
70ppm calculates aluminum shot consumption.
（7）After steel treatment deoxidation treatment, upper conticaster casting, the mass percent of composition in molten steel：C≤0.003%,
S, P≤0.006%, Al≤0.005%, remaining are Fe and inevitable impurity.
Embodiment 1：This nuclear power adopts following concrete technologies with the production method of ingot iron.
（1）Desulfurization station desulfurized molten iron S 0.006%, enters AOD furnace demanganize operation, and the composition by weight percent of half steel is：
C 3.5%, S 0.006%, Si 0.01%, Mn 0.07%, P 0.02%.
（2）Converter converts a tank desulphurised hot metal technique using a tank AOD half steel, and converter enters stove hot metal composition：C 4.038%, S
0.006%, Si 0.318%, Mn 0.187%, P 0.086%.1598 DEG C of tapping temperature, bores shelves slag, converter finishing slag alkali using shelves slag
Degree 3.0,80.9 tons of molten steel amount.Molten steel composition percentage by weight after tapping：C 0.0253%, P 0.0044%, S 0.0060%, Mn
0.05%, remaining is iron and inevitable impurity.
（3）After converter tapping, lime top slag 2.8kg/T is added in ladle, connect BOTTOM ARGON BLOWING, be hoisted to LF ladle refining furnace；
Lime 3.2kg/T is added during LF refining, and argon gas stirs 100NL/min, and heating-up temperature reaches 1640 DEG C.Heating is finished, fixed
Oxygen 510ppm, is uniformly sprinkled into refining ladle slag modifier 240kg in batches on the top of the slag, adds aluminum shot 75kg according to oxygen value is determined.Stove
Slag finishing slag dual alkalinity reaches 15.0.Sample, the composition by weight percent of molten steel is：C 0.033%, Mn 0.06%, P
0.009%, S 0.006%, remaining are iron and inevitable impurity.
（4）Ladle is hung RH refining furnace, to oxygen thermometric of standing firm：1632 DEG C of temperature, determines oxygen 200ppm, dip pipe is soaked
Enter in molten steel, start the full pump of vavuum pump and process.OB oxygen amount 116NM3, adds little particle lime stone 5kg/T, decarburization time after OB
8 minutes, vacuum was minimum to 0.120Kpa.Oxygen 410ppm is determined after decarburization, adds aluminum shot 60kg, circulation 3min vacuum breaker sampling point
Analysis, dissolved oxygen leaving from station are 35ppm.The composition by weight percent of molten steel is：C 0.0015%, Mn 0.04%, P 0.006%, S
0.0058%, remaining is iron and inevitable impurity.
（5）After molten steel is leaving from station, large square bland continuous-casting machine casting is hung to, direct motion of casting, billet specification 325mm × 280mm.Molten steel
Composition by weight percent be：C 0.0030%, Mn 0.04%, P 0.006%, S 0.006%, Al≤0.0050%, remaining is iron
With inevitable impurity.
Embodiment 2：This nuclear power adopts following concrete technologies with the production method of ingot iron.
（1）Desulfurization station desulfurized molten iron S：0.004%, AOD furnace demanganize operation is entered, the composition by weight percent of half steel is：
C:3.99%, S:0.004%, Si：0.01%, Mn:0.08%, P:0.051%.
（2）Converter converts a tank desulphurised hot metal technique using a tank AOD half steel, and converter enters stove hot metal composition：C:4.486%, S:
0.004%, Si：0.337%, Mn:0.161%, P:0.094%.1616 DEG C of tapping temperature, bores shelves slag, converter finishing slag alkali using shelves slag
Degree 3.7,82.3 tons of molten steel amount.Molten steel composition percentage by weight after tapping：C：0.0216%, P：0.0070%, S：0.0057%,
Mn：0.06%, remaining is iron and inevitable impurity.
（3）After converter tapping, lime top slag 2.0kg/T is added in ladle, connect BOTTOM ARGON BLOWING, be hoisted to LF ladle refining furnace；
Lime 4.0kg/T is added during LF refining, argon gas strong mixing 125NL/min, heating-up temperature reach 1641 DEG C.Heating is finished,
Determine oxygen 495ppm, be uniformly sprinkled into refining ladle slag modifier 240kg on the top of the slag in batches, aluminum shot 72kg is added according to oxygen value is determined.
Slag finishing slag dual alkalinity reaches 10.Sample, the composition by weight percent of molten steel is：C：0.032%, Mn：0.06%, P：
0.008%, S：0.006%, remaining is iron and inevitable impurity.
（4）Ladle is hung RH refining furnace, to oxygen thermometric of standing firm：1630 DEG C of temperature, determines oxygen 209ppm, dip pipe is soaked
Enter in molten steel, start the full pump of vavuum pump and process.OB oxygen amount 95NM3, adds little particle lime stone 2kg/T, decarburization time 8 after OB
Minute, vacuum is minimum to 0.09Kpa.Oxygen 373ppm is determined after decarburization, adds aluminum shot 55kg, circulation 3min vacuum breaker sampling point
Analysis, dissolved oxygen 20ppm leaving from station.The composition by weight percent of molten steel is：C：0.0021%, Mn：0.05%, P：0.006%, S：
0.0046%, remaining is iron and inevitable impurity.
（5）After molten steel is leaving from station, large square bland continuous-casting machine casting is hung to, direct motion of casting, billet specification 325mm × 280mm.Molten steel
Composition by weight percent be：C：0.0024%, Mn：0.05%, P：0.006%, S：0.006%, Al≤0.0017%, remaining is iron
With inevitable impurity.
Embodiment 3：This nuclear power adopts following concrete technologies with the production method of ingot iron.
（1）Desulfurization station desulfurized molten iron S：0.004%, AOD furnace demanganize operation is entered, the composition by weight percent of half steel is：
C:3.0%, S:0.003%, Si：0.01%, Mn:0.10%, P:0.040%.
（2）Converter converts a tank desulphurised hot metal technique using a tank AOD half steel, and converter enters stove hot metal composition：C:4.512%, S:
0.004%, Si：0.433%, Mn:0.268%, P:0.095%.1629 DEG C of tapping temperature, bores shelves slag, converter finishing slag alkali using shelves slag
Degree 4.0,80.2 tons of molten steel amount.Molten steel composition percentage by weight after tapping：C：0.0291%, P：0.0041%, S：0.0060%,
Mn：0.04%, remaining is iron and inevitable impurity.
（3）After converter tapping, lime top slag 3.0kg/T is added in ladle, connect BOTTOM ARGON BLOWING, be hoisted to LF ladle refining furnace；
Lime 3.0kg/T is added during LF refining, argon gas strong mixing 150NL/min, heating-up temperature reach 1660 DEG C.Heating is finished,
Determine oxygen 450ppm, be uniformly sprinkled into refining ladle slag modifier 240kg on the top of the slag in batches, aluminum shot 65kg is added according to oxygen value is determined.
Slag finishing slag dual alkalinity reaches 13.6.Sample, the composition by weight percent of molten steel is：C：0.028%, Mn：0.06%, P：
0.007%, S：0.006%, remaining is iron and inevitable impurity.
（4）Ladle is hung RH refining furnace, to oxygen thermometric of standing firm：1654 DEG C of temperature, determines oxygen 400ppm, dip pipe is soaked
Enter in molten steel, start the full pump of vavuum pump and process.OB oxygen amount 53NM3, adds little particle lime stone 3kg/T, decarburization time 8 after OB
Minute, vacuum is minimum to 0.09Kpa.Oxygen 528ppm is determined after decarburization, adds aluminum shot 75kg, circulation 3min vacuum breaker sampling point
Analysis, dissolved oxygen 31ppm leaving from station.The composition by weight percent of molten steel is：C：0.0018%, Mn：0.04%, P：0.0056%, S：
0.0052%, remaining is iron and inevitable impurity.
（5）After molten steel is leaving from station, large square bland continuous-casting machine casting is hung to, direct motion of casting, billet specification 325mm × 280mm.Molten steel
Composition by weight percent be：C：0.0021%, Mn：0.04%, P：0.0050%, S：0.0050%, Al≤0.0017%, remaining is
Iron and inevitable impurity.
Embodiment 4：This nuclear power adopts following concrete technologies with the production method of ingot iron.
（1）Desulfurization station desulfurized molten iron S：0.003%, AOD furnace demanganize operation is entered, the composition by weight percent of half steel is：
C:3.0%, S:0.003%, Si：0.01%, Mn:0.10%, P:0.040%.
（2）Converter converts a tank desulphurised hot metal technique using a tank AOD half steel, and converter enters stove hot metal composition：C:4.037%, S:
0.003%, Si：0.416%, Mn:0.359%, P:0.091%.1639 DEG C of tapping temperature, bores shelves slag, converter finishing slag alkali using shelves slag
Degree 3.5,78.1 tons of molten steel amount.Molten steel composition percentage by weight after tapping：C：0.0361%, P：0.0049%, S：0.0060%,
Mn：0.06%, remaining is iron and inevitable impurity.
（3）After converter tapping, lime top slag 2.0kg/T is added in ladle, connect BOTTOM ARGON BLOWING, be hoisted to LF ladle refining furnace；
Lime 4.0kg/T is added during LF refining, argon gas strong mixing 130NL/min, heating-up temperature reach 1655 DEG C.Heating is finished,
Determine oxygen 420ppm, be uniformly sprinkled into refining ladle slag modifier 240kg on the top of the slag in batches, aluminum shot 70kg is added according to oxygen value is determined.
Slag finishing slag dual alkalinity reaches 11.8.Sample, the composition by weight percent of molten steel is：C：0.041%, Mn：0.05%, P：
0.004%, S：0.006%, remaining is iron and inevitable impurity.
（4）Ladle is hung RH refining furnace, to oxygen thermometric of standing firm：1630 DEG C of temperature, determines oxygen 336ppm, dip pipe is soaked
Enter in molten steel, start the full pump of vavuum pump and process.OB oxygen amount 84NM3, adds little particle lime stone 4kg/T, decarburization time 8 after OB
Minute, vacuum is minimum to 0.101Kpa.Oxygen 409ppm is determined after decarburization, adds aluminum shot 60kg, circulation 3min vacuum breaker sampling point
Analysis, dissolved oxygen 28ppm leaving from station.The composition by weight percent of molten steel is：C：0.0016%, Mn：0.04%, P：0.0051%, S：
0.0056%, remaining is iron and inevitable impurity.
（5）After molten steel is leaving from station, large square bland continuous-casting machine casting is hung to, direct motion of casting, billet specification 325mm × 280mm.Molten steel
Composition by weight percent be：C：0.0030%, Mn：0.04%, P：0.0050%, S：0.0060%, Al≤0.0015%, remaining is
Iron and inevitable impurity.
Embodiment 5：This nuclear power adopts following concrete technologies with the production method of ingot iron.
（1）Desulfurization station desulfurized molten iron S：0.003%, AOD furnace demanganize operation is entered, the composition by weight percent of half steel is：
C:3.71%, S:0.005%, Si：0.01%, Mn:0.07%, P:0.040%.
（2）Converter converts a tank desulphurised hot metal technique using a tank AOD half steel, and converter enters stove hot metal composition：C:3.817%, S:
0.003%, Si：0.342%, Mn:0.353%, P:0.095%.1640 DEG C of tapping temperature, bores shelves slag, converter finishing slag alkali using shelves slag
Degree 3.6,80.5 tons of molten steel amount.Molten steel composition percentage by weight after tapping：C：0.0361%, P：0.0049%, S：0.0050%,
Mn：0.06%, remaining is iron and inevitable impurity.
（3）After converter tapping, lime top slag 2.5kg/T is added in ladle, connect BOTTOM ARGON BLOWING, be hoisted to LF ladle refining furnace；
Lime 3.5kg/T is added during LF refining, argon gas strong mixing 135NL/min, heating-up temperature reach 1651 DEG C.Heating is finished,
Determine oxygen 520ppm, be uniformly sprinkled into refining ladle slag modifier 240kg on the top of the slag in batches, aluminum shot 77kg is added according to oxygen value is determined.
Slag finishing slag dual alkalinity reaches 14.3.Sample, the composition by weight percent of molten steel is：C：0.035%, Mn：0.08%, P：
0.008%, S：0.005%, remaining is iron and inevitable impurity.
（4）Ladle is hung RH refining furnace, to oxygen thermometric of standing firm：1649 DEG C of temperature, determines oxygen 306ppm, dip pipe is soaked
Enter in molten steel, start the full pump of vavuum pump and process.OB oxygen amount 55NM3, adds little particle lime stone 4kg/T, decarburization time 8 after OB
Minute, vacuum is minimum to 0.103Kpa.Oxygen 398ppm is determined after decarburization, adds aluminum shot 57kg, circulation 3min vacuum breaker sampling point
Analysis, dissolved oxygen 20ppm leaving from station.The composition by weight percent of molten steel is：C：0.0025%, Mn：0.05%, P：0.0055%, S：
0.0056%, remaining is iron and inevitable impurity.
（5）After molten steel is leaving from station, large square bland continuous-casting machine casting is hung to, direct motion of casting, billet specification 325mm × 280mm.Molten steel
Composition by weight percent be：C：0.0030%, Mn：0.05%, P：0.006%, S：0.006%, Al≤0.0017%, remaining is iron
With inevitable impurity.
Claims (7)
1. a kind of production method of nuclear power ingot iron, it is characterised in that：Its by blast-melted after pretreatment desulfurizing, then
Carry out Mn, P being taken off at the beginning of molten iron through AOD converter, obtain half steel water of low P, S；Half steel water is through BOF converter smelting, LF stove
Refining, then molten steel carries out vacuum decarburization, deoxidation treatment through RH stove, you can obtain described ingot iron molten steel, concrete steps
For：
（1）Blast-melted process through blowing magnesium carries out desulfurization, makes S≤0.006wt% in molten iron；
（2）Molten iron after desulfurization is tentatively taken off Mn, P operation using AOD furnace；Become subpackage in half steel water of gained after de- Mn, P
Include：C 3.0～3.5wt%, Mn ＜ 0.10wt%, S≤0.006wt%, P≤0.040wt%, Si≤0.01wt%；
（3）Half steel water is smelted after being blended into BOF converter, and in tapping molten steel, composition by weight percent is：C≤0.04%,
P≤0.007%, S≤0.006%；Converter finishing slag dual alkalinity is 3～4；Lime top 2～3kg/ of slag is added during tapping into ladle
T, argon gas strong mixing；
（4）The tapping molten steel of BOF converter enters the refining of LF stove, plus 2～4kg/T of desulfurization lime heats up, and is warming up to 1640～1660
DEG C, argon gas strong mixing；Heating is finished to be carried out determining oxygen operation, closes Ladle Bottom and blows, and adds refining ladle slag modification on the top of the slag
Agent, and add aluminum shot to carry out deoxidation；Refining ladle slag modifier is carried out heating 1～2 minute after adding, slag finishing slag basicity control 10
～15；
（5）The tapping molten steel of LF stove is transported to RH stove and carries out Decarburization Operation, and after entering the station, circulation determines oxygen in 3 minutes；Carried out using OB technique
Decarburization, OB adopt full pumping application of vacuum after starting, below minimum vacuum degree control 120Pa；After OB terminates, from the alloy of RH stove
Hopper adds little particle lime stone to carry out carbonization treatment, controls decarburization circulation time >=8 minute, and decarburization terminates to determine oxygen；
（6）After decarburization terminates, using aluminum shot deoxidation；
（7）After steel treatment deoxidation treatment, upper billet caster casting, molten steel composition mass percent：C≤0.0030%, S, P
≤ 0.006%, Al≤0.0050%, remaining is Fe and inevitable impurity.
2. a kind of production method of nuclear power ingot iron according to claim 1, it is characterised in that the step（4）
In, the Ingredients Weight content of refining ladle slag modifier is：CaO 20～28%, Al2O323～30%, SiO22～8%, S 0～
0.15%, P 0～0.05%, Al 37～43%；The addition of refining ladle slag modifier is 3kg/T.
3. the production method of a kind of nuclear power ingot iron according to claim 1, it is characterised in that：The step（4）
In, on the basis of determining oxygen value 450ppm according to molten steel, aluminum shot addition is：[65+([O]-450)/6]kg；Often increase and decrease 60ppm oxygen contains
Amount, aluminum shot addition increase and decrease 10kg.
4. the production method of a kind of nuclear power ingot iron according to claim 1, it is characterised in that：The step（4）
In, the bottom blowing flow that argon gas strong mixing is adopted is 100L/min～150L/min.
5. a kind of production method of nuclear power ingot iron according to claim 1, it is characterised in that the step（5）
In, the oxygen amount of determining after entering the station is 200～400ppm.
6. a kind of production method of nuclear power ingot iron according to claim 1, it is characterised in that the step（5）
In：The lime stone of 2～5kg/T is added from alloy hopper.
7. a kind of production method of the nuclear power ingot iron according to claim 1-6 any one, it is characterised in that institute
State step（6）In：Control for Oxygen Content leaving from station after aluminum shot deoxidation is in 20～35ppm；Aluminum shot is calculated by 10kg aluminum shot deoxidation 70ppm
Consumption.
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|---|---|---|---|---|
| CN107287389A (en) * | 2016-04-04 | 2017-10-24 | 鞍钢股份有限公司 | RH deoxidation method of aluminum-free industrial pure iron |
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| CN110205439B (en) * | 2019-07-17 | 2021-03-16 | 攀钢集团钛业有限责任公司 | Method for producing industrial pure iron by smelting in EBT electric arc furnace |
| CN112795720A (en) * | 2020-12-12 | 2021-05-14 | 河钢股份有限公司 | Method for producing industrial pure iron by duplex converter method |
| CN114480944A (en) * | 2021-11-29 | 2022-05-13 | 安阳钢铁股份有限公司 | Preparation method of ultralow-carbon low-silicon low-aluminum steel |
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