CN110218839A - A kind of method of bearing steel smelting process depth desulfurization - Google Patents
A kind of method of bearing steel smelting process depth desulfurization Download PDFInfo
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- CN110218839A CN110218839A CN201910542589.0A CN201910542589A CN110218839A CN 110218839 A CN110218839 A CN 110218839A CN 201910542589 A CN201910542589 A CN 201910542589A CN 110218839 A CN110218839 A CN 110218839A
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
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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
- C21C7/064—Dephosphorising; Desulfurising
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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
- C21C7/10—Handling in a vacuum
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a kind of methods of bearing steel smelting process depth desulfurization, which comprises (1) molten iron pre-desulfurization: pre- desulfurization finishes molten iron S≤0.015%；(2) converter smelting: Tapping Temperature of Bof >=1650 DEG C, oxygen content≤400ppm, converter terminal molten steel S≤0.015%；(3) LF furnace refines: refining finishes molten steel S≤0.0020%；(4) RH furnace refines: into molten steel S≤0.0020%, RH vacuum retention time >=30min of RH furnace, RH furnace is hung to conticaster after refining and casts.The present invention is not increasing the liquid steel refining processing time outside furnace, under the conditions of relaxing the sulfur contents such as molten iron, steel scrap, slag charge, the problem of high basicity slag wadding stream, low basicity slag desulfurization effect difference is effectively evaded, stablize the finished product sulfur content of bearing steel below 0.0015%, it realizes the steady production of bearing steel depth desulfurization, obtains good economic benefit and social benefit.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of method of bearing steel smelting process depth desulfurization.
Background technique
Bearing steel applies the mechanical rotary part in various equipment mainly for the manufacture of ball, roller and bearing ring etc.,
Various shearing forces and heavy load are carry, it is all very tight to the requirements such as chemical component, nonmetal inclusion content and distribution, carbide
Lattice.And element sulphur, as one of chemical component, it not only causes the hot-short of steel, but also increases face crack, under toughness
Drop, and have larger impact to hydrogen induced cracking (HIC), sulphide stress corrosion crackle (SCC), the requirement to sulfur content is increasingly tight
Lattice, area protocol number require sulphur 0.0015% hereinafter, even below 0.0005%.
In Bearing Steel during Production, the sulfur content and molten steel of the raw materials such as control molten iron, slag charge, steel scrap are mainly taken
External refining makes high basicity slag and carries out desulfurization.And realize super-low sulfur, it is needed in refining process using " aluminium deoxidation+dual alkalinity >
15 high alkalinity slag system " technique.Clinker has stronger desulphurizing ability, but deoxidation products Al under the technique2O3、MgO-Al2O3
Equal fusing points are higher, if will cause wadding stream in the mouth of a river in casting process without Calcium treatment, and will form D class, Ds after Calcium treatment
Type impurity directly affects the service life of bearing steel, is required to forbid carrying out Calcium treatment by industry explicit order.
To evade flow problem of wadding a quilt with cotton caused by high alkalinity slag system, generally use dual alkalinity on 3.0 left sides in actual production process
Right low melting point slag system, the slag system desulfuration efficiency is limited, even if the sulfur content in control molten iron, slag charge, in process of production
Finished product sulphur difficult to realize is below 0.0015%.
Realize super-low sulfur production, need strictly to be managed in terms of raw material, as in molten iron S content 0.005% with
Under, using the steel scrap and slag charge of low-sulfur, in addition need to use the increase quantity of slag, secondary slag making during molten steel furnace external refining, with
And extend the modes such as processing time.The operation mode not only increases smelting cost, at the same also seriously restrict organization of production and up and down
The direct motion of procedure.
In view of the above technical problems, by the adjustment to each operational sequence and refinery cinder component, one kind is developed
The method of bearing steel smelting process depth desulfurization, when not increasing the liquid steel refining processing time outside furnace, even if relaxing molten iron, slag
Under the conditions of the sulfur contents such as material, steel scrap, stablize the finished product sulfur content of bearing steel 0.0015% hereinafter, casting properties also obtain simultaneously
To effective control, there is important Social benefit and economic benefit.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of methods of bearing steel smelting process depth desulfurization.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of bearing steel smelting process depth desulfurization
Method, the described method comprises the following steps:
(1) molten iron pre-desulfurization: molten iron S≤0.015% after molten iron pre-desulfurization is disposed；
(2) converter smelting: sequentially adding carburant, aluminium block, lime, synthetic slag when converter tapping, addition alloy adjustment chemistry at
Dividing the initial dual alkalinity that clinker is controlled to target content is 3.5~4.5, slag components are as follows: CaO:45~50%, SiO2: 10
~15%, Al2O3: 28~32%, MgO:6~8%, converter terminal molten steel S≤0.015%；
(3) LF furnace refines: 4~6kg/t of ferrosilicon powder steel, calcium carbide 4~6kg/t steel is added in slag surface after LF furnace enters the station, and adds simultaneously
Enter lime, synthetic slag, the dual alkalinity for controlling clinker is 5.0~6.0, slag components are as follows: CaO:50~55%, SiO2: 9~
11%、Al2O3: 22~26%, MgO:6~8%；Refining process BOTTOM ARGON BLOWING tolerance control molten steel seethes area in 300~400mm；Refining
Preceding 3~5min is finished, 2~3kg/t of fluorite steel, 1~2min of electrified regulation time is added；LF furnace refining finish molten steel S≤
0.0020%；
(4) RH furnace refines: molten steel S≤0.0020%, the RH furnace into RH furnace is evacuated, 70~130Pa of vacuum degree, vacuum
Retention time >=30min；RH furnace obtains qualified molten steel after refining, and is hung to conticaster and casts.
Step (2) aluminium block additional amount of the present invention is controlled according into LF furnace molten steel Al content 0.03~0.04%.
In step (2) of the present invention, the additional amount of carburant is 7.0-8.0kg/t steel, C >=95% in the carburant.
In step (2) of the present invention, lime adding amount is 2.5~3.5kg/t steel, synthetic slag additional amount be 8.5~
10.0kg/t steel.
In step (3) of the present invention, lime adding amount be 5.5~7.0kg/t steel, synthetic slag additional amount be 2.0~
4.0kg/t steel.
Step (2) of the present invention and (3) synthetic slag main component are as follows: CaO:45~50%, Al2O3: 33~38%, SiO2:
10~15%, MgO≤3.0%, S≤0.05%, P≤0.05%.
Step (2) of the present invention, Tapping Temperature of Bof >=1650 DEG C, tap oxygen content≤400ppm.
Step (4) of the present invention, S≤0.0015% in qualified molten steel.
The beneficial effects of adopting the technical scheme are that the present invention is not when increasing liquid steel refining processing outside furnace
Between, under the conditions of relaxing the sulfur contents such as molten iron, steel scrap, slag charge, by the reasonable control of technical process, effectively evade high alkalinity
The problem of slag wadding stream, low basicity slag desulfurization effect difference, obtains low-sulfur molten steel, guarantees that the finished product sulfur content of bearing steel is stablized
0.0015% hereinafter, realize the steady production of bearing steel depth desulfurization, obtains good economic benefit and social benefit.
Specific embodiment
Present invention will be explained in further detail combined with specific embodiments below.
Embodiment 1
The method of the present embodiment bearing steel smelting process depth desulfurization the following steps are included:
(1) molten iron pre-desulfurization: molten iron S:0.015% after molten iron pre-desulfurization is disposed；
(2) converter smelting: 1660 DEG C of Tapping Temperature of Bof, tap oxygen content 350ppm；Carburant is sequentially added when converter tapping
7.5kg/t steel, aluminium block, lime 2.7kg/t steel, synthetic slag 9.0kg/t steel, alloy, aluminium block additional amount is according into LF furnace Al content
In 0.038% control, addition alloy adjusts chemical component to target content, controls the initial dual alkalinity of clinker 4.0, clinker
Component are as follows: CaO:47%, SiO2: 10%, Al2O3: 30%, MgO:6%；Converter terminal S:0.012%；
Carburant C:98%；Synthetic slag main component are as follows: CaO:48%, Al2O3: 38%, SiO2: 12%, MgO:3.0%, S:0.025%,
P:0.0035%；
(3) LF furnace refines: ferrosilicon powder 5kg/t steel, calcium carbide 5kg/t steel is added in slag surface after LF furnace enters the station；Lime is added simultaneously
5.7kg/t steel, synthetic slag 3.0kg/t steel, control the dual alkalinity of clinker 5.5, slag components are as follows: CaO:55%, SiO2:
10%、Al2O3: 25%, MgO:8%；Refining process BOTTOM ARGON BLOWING tolerance control molten steel seethes area in 350mm；Refining finishes preceding 3min, adds
Enter fluorite 2.5kg/t steel, electrified regulation time 2min；S:0.0020% is sampled after refining；
Synthetic slag main component are as follows: CaO:48%, Al2O3: 38%, SiO2: 12%, MgO:3.0%, S:0.025%, P:0.0035%；
(4) RH furnace refines: S:0.0020% after RH furnace enters the station, RH furnace are evacuated, vacuum degree 70Pa, the vacuum retention time
32min, sampling S:0.0015% leaving from station；RH furnace obtains qualified molten steel after refining, and is hung to conticaster and casts.
Molten steel S:0.0015% after the method processing of the present embodiment bearing steel smelting process depth desulfurization is not increasing molten steel essence outside furnace
In the case of the refining processing time, the problem of high basicity slag wadding stream, low basicity slag desulfurization effect difference is effectively evaded, has realized bearing steel
The steady production of deep desulfurization.
Embodiment 2
The method of the present embodiment bearing steel smelting process depth desulfurization the following steps are included:
(1) molten iron pre-desulfurization: molten iron S:0.013% after molten iron pre-desulfurization is disposed；
(2) converter smelting: 1650 DEG C of Tapping Temperature of Bof, tap oxygen content 330ppm；Carburant is sequentially added when converter tapping
7.7kg/t steel, aluminium block, lime 3.1kg/t steel, synthetic slag 9.5kg/t steel, alloy, aluminium block additional amount is according into LF furnace Al content
In 0.040% control, addition alloy adjusts chemical component to target content, controls the initial dual alkalinity of clinker 3.8, clinker
Component are as follows: CaO:48%, SiO2: 11.5%, Al2O3: 31%, MgO:7%；Converter terminal S:0.010%；
Carburant C:96%；Synthetic slag main component are as follows: CaO:46%, Al2O3: 35%, SiO2: 13%, MgO:2.8%, S:0.035%,
P:0.015%；
(3) LF furnace refines: ferrosilicon powder 4.5kg/t steel, calcium carbide 4.5kg/t steel is added in slag surface after LF furnace enters the station；It is added simultaneously
Lime 6.0kg/t steel, synthetic slag 3.5kg/t steel, control the dual alkalinity of clinker 5.2, slag components are as follows: CaO:53%,
SiO2: 9.8%, Al2O3: 23%, MgO:7%；Refining process BOTTOM ARGON BLOWING tolerance control molten steel seethes area in 330mm；Before refining finishes
Fluorite 2.7kg/t steel, electrified regulation time 1.5min is added in 3.5min；S:0.0018% is sampled after refining；
Synthetic slag main component are as follows: CaO:46%, Al2O3: 35%, SiO2: 13%, MgO:2.8%, S:0.035%, P:0.015%；
(4) RH furnace refines: S:0.0018% after RH furnace enters the station, RH furnace are evacuated, vacuum degree 80Pa, the vacuum retention time
31min, sampling S:0.0010% leaving from station；RH furnace obtains qualified molten steel after refining, and is hung to conticaster and casts.
Molten steel S:0.0010% after the method processing of the present embodiment bearing steel smelting process depth desulfurization is not increasing molten steel essence outside furnace
In the case of the refining processing time, the problem of high basicity slag wadding stream, low basicity slag desulfurization effect difference is effectively evaded, has realized bearing steel
The steady production of deep desulfurization.
Embodiment 3
The method of the present embodiment bearing steel smelting process depth desulfurization the following steps are included:
(1) molten iron pre-desulfurization: molten iron S:0.012% after molten iron pre-desulfurization is disposed；
(2) converter smelting: 1655 DEG C of Tapping Temperature of Bof, tap oxygen content 370ppm；Carburant is sequentially added when converter tapping
7.6kg/t steel, aluminium block, lime 2.9kg/t steel, synthetic slag 9.7kg/t steel, alloy, aluminium block additional amount is according into LF furnace Al content
In 0.032% control, addition alloy adjusts chemical component to target content, controls the initial dual alkalinity of clinker 4.2, clinker
Component are as follows: CaO:46%, SiO2: 12%, Al2O3: 29%, MgO:6.5%；Converter terminal S:0.010%；
Carburant C:96.5%；Synthetic slag main component are as follows: CaO:49%, Al2O3: 37%, SiO2: 12.5%, MgO:2.7%, S:
0.028%, P:0.0045%；
(3) LF furnace refines: ferrosilicon powder 5.5kg/t steel, calcium carbide 5.5kg/t steel is added in slag surface after LF furnace enters the station；It is added simultaneously
Lime 6.5kg/t steel, synthetic slag 2.3kg/t steel, control the dual alkalinity of clinker 5.7, slag components are as follows: CaO:51%,
SiO2: 10.5%, Al2O3: 24%, MgO:6.5%；Refining process BOTTOM ARGON BLOWING tolerance control molten steel seethes area in 380mm；Refining finishes
Fluorite 2.3kg/t steel, electrified regulation time 1.2min is added in preceding 4min；S:0.0020% is sampled after refining；
Synthetic slag main component are as follows: CaO:49%, Al2O3: 37%, SiO2: 12.5%, MgO:2.7%, S:0.028%, P:0.0045%；
(4) RH furnace refines: S:0.0020% after RH furnace enters the station, RH furnace are evacuated, vacuum degree 75Pa, the vacuum retention time
35min, sampling S:0.0011% leaving from station；RH furnace obtains qualified molten steel after refining, and is hung to conticaster and casts.
Molten steel S:0.0011% after the method processing of the present embodiment bearing steel smelting process depth desulfurization is not increasing molten steel essence outside furnace
In the case of the refining processing time, the problem of high basicity slag wadding stream, low basicity slag desulfurization effect difference is effectively evaded, has realized bearing steel
The steady production of deep desulfurization.
Embodiment 4
The method of the present embodiment bearing steel smelting process depth desulfurization the following steps are included:
(1) molten iron pre-desulfurization: molten iron S:0.011% after molten iron pre-desulfurization is disposed；
(2) converter smelting: 1665 DEG C of Tapping Temperature of Bof, tap oxygen content 320ppm；Carburant is sequentially added when converter tapping
7.8kg/t steel, aluminium block, lime 3.3kg/t steel, synthetic slag 9.8kg/t steel, alloy, aluminium block additional amount is according into LF furnace Al content
In 0.035% control, addition alloy adjusts chemical component to target content, controls the initial dual alkalinity of clinker 4.3, clinker
Component are as follows: CaO:49%, SiO2: 13%, Al2O3: 31.5%, MgO:7.5%；Converter terminal S:0.010%；
Carburant C:95%；Synthetic slag main component are as follows: CaO:45%, Al2O3: 36%, SiO2: 10%, MgO:2.0%, S:0.022%,
P:0.0025%；
(3) LF furnace refines: ferrosilicon powder 4.3kg/t steel, calcium carbide 4.3kg/t steel is added in slag surface after LF furnace enters the station；It is added simultaneously
Lime 5.9kg/t steel, synthetic slag 3.2kg/t steel, control the dual alkalinity of clinker 5.6, slag components are as follows: CaO:54%,
SiO2: 10.2%, Al2O3: 22.5%, MgO:7.5%；Refining process BOTTOM ARGON BLOWING tolerance control molten steel seethes area in 360mm；It has refined
Fluorite 2.9kg/t steel, electrified regulation time 1.7min is added in 4.5min before finishing；S:0.0018% is sampled after refining；
Synthetic slag main component are as follows: CaO:45%, Al2O3: 36%, SiO2: 10%, MgO:2.0%, S:0.022%, P:0.0025%；
(4) RH furnace refines: S:0.0018% after RH furnace enters the station, RH furnace are evacuated, vacuum degree 80Pa, the vacuum retention time
33min, sampling S:0.0013% leaving from station；RH furnace obtains qualified molten steel after refining, and is hung to conticaster and casts.
Molten steel S:0.0013% after the method processing of the present embodiment bearing steel smelting process depth desulfurization is not increasing molten steel essence outside furnace
In the case of the refining processing time, the problem of high basicity slag wadding stream, low basicity slag desulfurization effect difference is effectively evaded, has realized bearing steel
The steady production of deep desulfurization.
Embodiment 5
The method of the present embodiment bearing steel smelting process depth desulfurization the following steps are included:
(1) molten iron pre-desulfurization: molten iron S:0.014% after molten iron pre-desulfurization is disposed；
(2) converter smelting: 1670 DEG C of Tapping Temperature of Bof, tap oxygen content 360ppm；Carburant is sequentially added when converter tapping
7.9kg/t steel, aluminium block, lime 2.8kg/t steel, synthetic slag 8.5kg/t steel, alloy, aluminium block additional amount is according into LF furnace Al content
In 0.036% control, addition alloy adjusts chemical component to target content, controls the initial dual alkalinity of clinker 3.7, clinker
Component are as follows: CaO:46.5%, SiO2: 14.8%, Al2O3: 30.5%, MgO:6.3%；Converter terminal S:0.012%；
Carburant C:95.5%；Synthetic slag main component are as follows: CaO:47%, Al2O3: 34%, SiO2: 14%, MgO:2.4%, S:
0.045%, P:0.025%；
(3) LF furnace refines: ferrosilicon powder 5.7kg/t steel, calcium carbide 5.7kg/t steel is added in slag surface after LF furnace enters the station；It is added simultaneously
Lime 6.3kg/t steel, synthetic slag 2.7kg/t steel, control the dual alkalinity of clinker 5.3, slag components are as follows: CaO:52%,
SiO2: 9.8%, Al2O3: 24.5%, MgO:6.7%；Refining process BOTTOM ARGON BLOWING tolerance control molten steel seethes area in 310mm；It has refined
Fluorite 2.1kg/t steel, electrified regulation time 1.6min is added in 3.2min before finishing；S:0.0019% is sampled after refining；
Synthetic slag main component are as follows: CaO:47%, Al2O3: 34%, SiO2: 14%, MgO:2.4%, S:0.045%, P:0.025%；
(4) RH furnace refines: S:0.0019% after RH furnace enters the station, RH furnace are evacuated, vacuum degree 85Pa, the vacuum retention time
38min, sampling S:0.0014% leaving from station；RH furnace obtains qualified molten steel after refining, and is hung to conticaster and casts.
Molten steel S:0.0014% after the method processing of the present embodiment bearing steel smelting process depth desulfurization is not increasing molten steel essence outside furnace
In the case of the refining processing time, the problem of high basicity slag wadding stream, low basicity slag desulfurization effect difference is effectively evaded, has realized bearing steel
The steady production of deep desulfurization.
Embodiment 6
The method of the present embodiment bearing steel smelting process depth desulfurization the following steps are included:
(1) molten iron pre-desulfurization: molten iron S:0.0125% after molten iron pre-desulfurization is disposed；
(2) converter smelting: 1680 DEG C of Tapping Temperature of Bof, tap oxygen content 390ppm；Carburant is sequentially added when converter tapping
8.0kg/t steel, aluminium block, lime 3.2kg/t steel, synthetic slag 9.0kg/t steel, alloy, aluminium block additional amount is according into LF furnace Al content
In 0.039% control, addition alloy adjusts chemical component to target content, controls the initial dual alkalinity of clinker 4.1, clinker
Component are as follows: CaO:48.3%, SiO2: 12.7%, Al2O3: 28.6%, MgO:7.2%；Converter terminal S:0.010%；
Carburant C:97.5%；Synthetic slag main component are as follows: CaO:46.5%, Al2O3: 34.5%, SiO2: 11.5%, MgO:2.2%,
S:0.015%, P:0.0015%；
(3) LF furnace refines: ferrosilicon powder 4.9kg/t steel, calcium carbide 4.9kg/t steel is added in slag surface after LF furnace enters the station；It is added simultaneously
Lime 6.8kg/t steel, synthetic slag 2.1kg/t steel, control the dual alkalinity of clinker 5.4, slag components are as follows: CaO:53.6%,
SiO2: 10.3%, Al2O3: 25.1%, MgO:7.7%；Refining process BOTTOM ARGON BLOWING tolerance control molten steel seethes area in 390mm；It has refined
Fluorite 2.4kg/t steel, electrified regulation time 1.4min is added in 3.8min before finishing；S:0.0018% is sampled after refining；
Synthetic slag main component are as follows: CaO:46.5%, Al2O3: 34.5%, SiO2: 11.5%, MgO:2.2%, S:0.015%, P:
0.0015%；
(4) RH furnace refines: S:0.0018% after RH furnace enters the station, RH furnace are evacuated, vacuum degree 90Pa, the vacuum retention time
37min, sampling S:0.0012% leaving from station；RH furnace obtains qualified molten steel after refining, and is hung to conticaster and casts.
Molten steel S:0.0012% after the method processing of the present embodiment bearing steel smelting process depth desulfurization is not increasing molten steel essence outside furnace
In the case of the refining processing time, the problem of high basicity slag wadding stream, low basicity slag desulfurization effect difference is effectively evaded, has realized bearing steel
The steady production of deep desulfurization.
Embodiment 7
The method of the present embodiment bearing steel smelting process depth desulfurization the following steps are included:
(1) molten iron pre-desulfurization: molten iron S:0.0138% after molten iron pre-desulfurization is disposed；
(2) converter smelting: 1675 DEG C of Tapping Temperature of Bof, tap oxygen content 380ppm；Carburant is sequentially added when converter tapping
7.3kg/t steel, aluminium block, lime 2.5kg/t steel, synthetic slag 8.5kg/t steel, alloy, aluminium block additional amount is according into LF furnace Al content
In 0.033% control, addition alloy adjusts chemical component to target content, controls the initial dual alkalinity of clinker 3.5, clinker
Component are as follows: CaO:45%, SiO2: 15%, Al2O3: 28%, MgO:6.9%；Converter terminal S:0.010%；
Carburant C:98%；Synthetic slag main component are as follows: CaO:47.3%, Al2O3: 35.7%, SiO2: 14.2%, MgO:2.5%, S:
0.032%, P:0.010%；
(3) LF furnace refines: ferrosilicon powder 4kg/t steel, calcium carbide 4kg/t steel is added in slag surface after LF furnace enters the station；Lime is added simultaneously
5.5kg/t steel, synthetic slag 4.0kg/t steel, control the dual alkalinity of clinker 5.0, slag components are as follows: CaO:52.6%, SiO2:
11%、Al2O3: 22%, MgO:7.9%；Refining process BOTTOM ARGON BLOWING tolerance control molten steel seethes area in 300mm；Before refining finishes
Fluorite 3.0kg/t steel, electrified regulation time 1.3min is added in 4.7min；S:0.0019% is sampled after refining；
Synthetic slag main component are as follows: CaO:47.3%, Al2O3: 35.7%, SiO2: 14.2%, MgO:2.5%, S:0.032%, P:
0.010%；
(4) RH furnace refines: S:0.0019% after RH furnace enters the station, RH furnace are evacuated, vacuum degree 115Pa, the vacuum retention time
40min, sampling S:0.0010% leaving from station；RH furnace obtains qualified molten steel after refining, and is hung to conticaster and casts.
Molten steel S:0.0010% after the method processing of the present embodiment bearing steel smelting process depth desulfurization is not increasing molten steel essence outside furnace
In the case of the refining processing time, the problem of high basicity slag wadding stream, low basicity slag desulfurization effect difference is effectively evaded, has realized bearing steel
The steady production of deep desulfurization.
Embodiment 8
The method of the present embodiment bearing steel smelting process depth desulfurization the following steps are included:
(1) molten iron pre-desulfurization: molten iron S:0.015% after molten iron pre-desulfurization is disposed；
(2) converter smelting: 1690 DEG C of Tapping Temperature of Bof, tap oxygen content 400ppm；Carburant is sequentially added when converter tapping
7.0kg/t steel, aluminium block, lime 3.5kg/t steel, synthetic slag 10.0kg/t steel, alloy, aluminium block additional amount is according into LF furnace Al content
In 0.030% control, addition alloy adjusts chemical component to target content, controls the initial dual alkalinity of clinker 4.5, clinker
Component are as follows: CaO:50%, SiO2: 12%, Al2O3: 32%, MgO:8%；Converter terminal S:0.015%；
Carburant C:97%；Synthetic slag main component are as follows: CaO:50%, Al2O3: 33%, SiO2: 15%, MgO:2.2%, S:0.05%,
P:0.05%；
(3) LF furnace refines: ferrosilicon powder 6kg/t steel, calcium carbide 6kg/t steel is added in slag surface after LF furnace enters the station；Lime is added simultaneously
7.0kg/t steel, synthetic slag 2.0kg/t steel, control the dual alkalinity of clinker 6.0, slag components are as follows: CaO:50%, SiO2: 9%,
Al2O3: 26%, MgO:6%；Refining process BOTTOM ARGON BLOWING tolerance control molten steel seethes area in 400mm；Refining finishes preceding 5min, and firefly is added
Stone 2.0kg/t steel, electrified regulation time 1.0min；S:0.0015% is sampled after refining；
Synthetic slag main component are as follows: CaO:50%, Al2O3: 33%, SiO2: 15%, MgO:2.2%, S:0.05%, P:0.05%；
(4) RH furnace refines: S:0.0015% after RH furnace enters the station, RH furnace are evacuated, vacuum degree 130Pa, the vacuum retention time
30min, sampling S:0.0013% leaving from station；RH furnace obtains qualified molten steel after refining, and is hung to conticaster and casts.
Molten steel S:0.0013% after the method processing of the present embodiment bearing steel smelting process depth desulfurization is not increasing molten steel essence outside furnace
In the case of the refining processing time, the problem of high basicity slag wadding stream, low basicity slag desulfurization effect difference is effectively evaded, has realized bearing steel
The steady production of deep desulfurization.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (8)
1. a kind of method of bearing steel smelting process depth desulfurization, which is characterized in that the described method comprises the following steps:
(1) molten iron pre-desulfurization: molten iron S≤0.015% after molten iron pre-desulfurization is disposed；
(2) converter smelting: sequentially adding carburant, aluminium block, lime, synthetic slag when converter tapping, addition alloy adjustment chemistry at
Dividing the initial dual alkalinity that clinker is controlled to target content is 3.5~4.5, slag components are as follows: CaO:45~50%, SiO2: 10
~15%, Al2O3: 28~32%, MgO:6~8%, converter terminal molten steel S≤0.015%；
(3) LF furnace refines: 4~6kg/t of ferrosilicon powder steel, calcium carbide 4~6kg/t steel is added in slag surface after LF furnace enters the station, and adds simultaneously
Enter lime, synthetic slag, the dual alkalinity for controlling clinker is 5.0~6.0, slag components are as follows: CaO:50~55%, SiO2: 9~
11%、Al2O3: 22~26%, MgO:6~8%；Refining process BOTTOM ARGON BLOWING tolerance control molten steel seethes area in 300~400mm；Refining
Preceding 3~5min is finished, 2~3kg/t of fluorite steel, 1~2min of electrified regulation time is added；LF furnace refining finish molten steel S≤
0.0020%；
(4) RH furnace refines: molten steel S≤0.0020%, the RH furnace into RH furnace is evacuated, 70~130Pa of vacuum degree, vacuum
Retention time >=30min；RH furnace obtains qualified molten steel after refining, and is hung to conticaster and casts.
2. a kind of method of bearing steel smelting process depth desulfurization according to claim 1, which is characterized in that the step
(2) aluminium block additional amount is controlled according into LF furnace molten steel Al content 0.03~0.04%.
3. a kind of method of bearing steel smelting process depth desulfurization according to claim 1, which is characterized in that the step
(2) in, the additional amount of carburant is 7.0-8.0kg/t steel, C >=95% in the carburant.
4. a kind of method of bearing steel smelting process depth desulfurization according to claim 1, which is characterized in that the step
(2) in, lime adding amount is 2.5~3.5kg/t steel, synthetic slag additional amount is 8.5~10.0kg/t steel.
5. a kind of method of bearing steel smelting process depth desulfurization according to claim 1, which is characterized in that the step
(3) in, lime adding amount is 5.5~7.0kg/t steel, and synthetic slag additional amount is 2.0~4.0kg/t steel.
6. a kind of method of bearing steel smelting process depth desulfurization described in -5 any one according to claim 1, which is characterized in that
The step (2) and (3) synthetic slag main component are as follows: CaO:45~50%, Al2O3: 33~38%, SiO2: 10~15%, MgO≤
3.0%、S≤0.05%、P≤0.05%。
7. a kind of method of bearing steel smelting process depth desulfurization described in -5 any one according to claim 1, which is characterized in that
The step (2), Tapping Temperature of Bof >=1650 DEG C, tap oxygen content≤400ppm.
8. a kind of method of bearing steel smelting process depth desulfurization described in -5 any one according to claim 1, which is characterized in that
The step (4), S≤0.0015% in qualified molten steel.
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| CN115820984A (en) * | 2022-11-30 | 2023-03-21 | 河北荣信钢铁有限公司 | Desulfurization slagging agent and converter steelmaking desulfurization process |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06145883A (en) * | 1992-11-02 | 1994-05-27 | Daido Steel Co Ltd | High purity bearing steel and its production |
| CN104087719A (en) * | 2014-07-04 | 2014-10-08 | 常州东大中天钢铁研究院有限公司 | Smelting process of high-carbon bearing steel |
| CN105463150A (en) * | 2015-12-18 | 2016-04-06 | 中天钢铁集团有限公司 | Steel smelting process used for automobile hub bearing |
| CN109402327A (en) * | 2018-11-22 | 2019-03-01 | 江阴兴澄特种钢铁有限公司 | A kind of external refining production method of super clean high-carbon-chromium bearing steel |
| CN109680122A (en) * | 2019-02-15 | 2019-04-26 | 江苏利淮钢铁有限公司 | A kind of hub bearing steel and its manufacturing method |
-
2019
- 2019-06-21 CN CN201910542589.0A patent/CN110218839B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06145883A (en) * | 1992-11-02 | 1994-05-27 | Daido Steel Co Ltd | High purity bearing steel and its production |
| CN104087719A (en) * | 2014-07-04 | 2014-10-08 | 常州东大中天钢铁研究院有限公司 | Smelting process of high-carbon bearing steel |
| CN105463150A (en) * | 2015-12-18 | 2016-04-06 | 中天钢铁集团有限公司 | Steel smelting process used for automobile hub bearing |
| CN109402327A (en) * | 2018-11-22 | 2019-03-01 | 江阴兴澄特种钢铁有限公司 | A kind of external refining production method of super clean high-carbon-chromium bearing steel |
| CN109680122A (en) * | 2019-02-15 | 2019-04-26 | 江苏利淮钢铁有限公司 | A kind of hub bearing steel and its manufacturing method |
Non-Patent Citations (1)
| Title |
|---|
| 丁小明 等: "LF-RH工艺生产极低硫钢硫含量控制分析", 《炼钢》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115820984A (en) * | 2022-11-30 | 2023-03-21 | 河北荣信钢铁有限公司 | Desulfurization slagging agent and converter steelmaking desulfurization process |
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