CN110205443A - A kind of siliceous aluminum killed steel Ultra Low-oxygen smelting process of low-carbon - Google Patents

A kind of siliceous aluminum killed steel Ultra Low-oxygen smelting process of low-carbon Download PDF

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CN110205443A
CN110205443A CN201910542407.XA CN201910542407A CN110205443A CN 110205443 A CN110205443 A CN 110205443A CN 201910542407 A CN201910542407 A CN 201910542407A CN 110205443 A CN110205443 A CN 110205443A
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steel
low
control
carbon
slag
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CN110205443B (en
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徐建飞
王昆鹏
王郢
万文华
屈志东
屠兴圹
来永彪
孟晓玲
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Zenith Steel Group Co Ltd
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Zenith Steel Group Co Ltd
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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
    • 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
    • C21C7/0025—Adding carbon material
    • 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
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • 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
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/076—Use of slags or fluxes as treating agents
    • 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
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/10—Reduction of greenhouse gas [GHG] emissions
    • Y02P10/134—Reduction of greenhouse gas [GHG] emissions by avoiding CO2, e.g. using hydrogen
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The invention belongs to process for making technical fields, are related to a kind of siliceous aluminum killed steel Ultra Low-oxygen smelting process of low-carbon, and the present invention uses " BOF-LF-RH-CC " process route.It is refined using conventional basicity (R=5.0~10.0), by control types of alloys and opportunity is added, can reach and inhibit LF process Al2O3Field trash changes purpose to calcium-aluminate, to realize that refining terminates Al in preceding steel2O3It is Control and Inclusion Removal, it, can efficient removal Al then by RH vacuum2O3It is field trash, finished product T.O is can be controlled within 8ppm.

Description

A kind of siliceous aluminum killed steel Ultra Low-oxygen smelting process of low-carbon
Technical field
The invention belongs to process for making technical fields, are related specifically to siliceous Al deoxidization steel Ultra Low-oxygen smelting control method.
Background technique
With the development of iron and steel smelting technology, the requirement to Cleanliness of Molten Steel is also higher and higher, especially wants to field trash Seek very high automobile steel.For high-carbon steel, since molten steel C can further decrease dissolved oxygen content under vacuum condition, adopt With LF-RH refinery practice, it is easy high-carbon steel such as the total oxygen of GCr15 (T.O) control within 8ppm.But for the low of C < 0.25% Carbon steel, using identical production technology, finished product T.O is only controlled to 10~15ppm, is difficult control within 8ppm.
Through retrieving, the patent and paper delivered both at home and abroad mainly such as use the high reproducibility refining of high alkalinity from reinforcing LF refining Slag, reinforcing RH vacuumizing such as postpone vacuum processing time, control condition of high vacuum degree reduces molten steel total oxygen content.Chinese patent Shen Please number CN201110403479.X " a kind of production method of ultralow oxide inclusion steel " propose use RH-LF-RH refinery practice Ultra low oxygen steel is produced, although in this way can be by bearing steel total oxygen control to 5ppm, technique be cumbersome, production cost It is higher, it is difficult to be widely applied in industrial production.A kind of Chinese Patent Application No. CN201811167952.7 " no Ds type impurity Bearing steel molten steel deoxidation control method " point out to produce low-aluminum-content bearing steel using low alkalinity refining slag, T.O can control 10ppm or less.This method is only applicable to high carbon bearing steel, reduces dissolved oxygen using carbon under vacuum conditions, is finally reached Control T.O purpose.For mild steel, it is difficult to realize Ultra Low-oxygen in this way and smelts.Chinese Patent Application No. CN201310456419.3 " a kind of smelting process of hic resistance/SSCC steel " proposes to use the high reproducibility refining slag of high alkalinity, first It is liquid calcium-aluminate by LF process inclusion modification, is then removed it by RH to realize that Ultra Low-oxygen smelts purpose, it is this Method thinks that liquid calcium-aluminate will be easier to be removed from molten steel, but liquid inclusions and the angle of wetting of molten steel are significant Lower than solid inclusions, i.e. liquid calcium aluminate inclusion is more difficult to be removed than solid inclusions, therefore, using this side Method is difficult to control mild steel T.O to 8ppm or less.Document " Investigation on the removal efficiency Of inclusions in Al-killed liquid steel in different refining processes " is pointed out Solid-state Al2O3Field trash removal efficiency during RH is significantly larger than calcium-aluminate, since the reaction of LF process slag steel is difficult to avoid that, Field trash is easy to by Al2O3It is changed into calcium-aluminate, therefore, in order to guarantee that field trash is Al before RH application of vacuum2O3, propose Low-carbon pipe line steel is produced using BOF-RH-CC technique.But for most of steel grade, cancel LF refining furnace, RH processing terminate steel Coolant-temperature gage is difficult to meet continuous casting casting requirement, and therefore, many steel grades will first carry out LF processing before RH processing.But if first Using LF refining, field trash is easy to by Al2O3It is changed into calcium-aluminate, there is presently no corresponding patents or document to provide suppression LF process Al processed2O3The method changed to calcium-aluminate.Based on this controlling difficulties, Chinese Patent Application No. CN201611126263.2 " a kind of pipeline steel smelting technique for improving Molten Steel Cleanliness " is proposed in RH application of vacuum to molten steel Middle oxygen blast, this operation can make calcium-aluminate be re-converted to Al2O3, but due to Al after oxygen blast2O3The amount of inclusions density It increased dramatically, it then becomes necessary to which additionally extending vacuum processing time could be by overwhelming majority Al in molten steel2O3It gets rid of.
For this purpose, producing the siliceous aluminum killed steel of low-carbon for using " BOF-LF-RH-CC " technique, the present invention provides a kind of suppression LF process Al processed2O3Field trash, can efficient removal Al then by RH vacuum to calcium-aluminate method of converting2O3System is mingled with Object, it is final to realize that Ultra Low-oxygen smelts purpose.
Summary of the invention
Object of the present invention is to develop a kind of siliceous aluminum killed steel Ultra Low-oxygen smelting process of low-carbon, this method can substitute biography The smelting process of system, it is easy to realize that mild steel Ultra Low-oxygen is smelted, and significantly improve product quality grade.
The steel grade mass percent ingredient are as follows: C:0.05~0.25%, Si:0.15~0.25%, Mn:0.3~ 1.5%, S:0.005~0.015%, Al:0.015~0.04%, remaining is iron and residual elements.
A kind of siliceous aluminum killed steel Ultra Low-oxygen smelting process of low-carbon, it is characterised in that the technique includes following main points:
(1) at 1610~1660 DEG C, terminal S is controlled below 0.015% the control of converter terminal temperature；Converter tapping is first 130kg aluminium cake is added to carry out deoxidation, subsequent manganese addition iron, low nitrogen carburant carry out alloying, and any silicon-containing alloy is not added in tapping process Such as ferrosilicon, silicomanganese, silicon electrolyzation, alloy adds 600kg/ hearthstone ash after being added and 100kg/ furnace fluorite carries out slag making.
(2) LF enters the station first to 6~10min of molten steel heating, when being warming up to 1550 DEG C or more then liquid steel sampling is carried out at Point analysis, after composition detection result feedback controlled to aluminum shot is added after operating room into molten steel molten steel Al content be 0.025~ 0.05%, and manganese addition iron, low nitrogen carburant adjustment Mn and C content, refining basicity of slag control (TFe+ in 5.0~10.0, slag MnO) content control is below 1.20%.Any silicon-containing alloy such as ferrosilicon, silicomanganese, silicon electrolyzation is not added in LF process, if LF latter stage steel Liquid Al content is lower, can continue plus aluminum shot adjustment molten steel Al content is 0.030~0.045%.Steel ladle bottom argon blowing flow control exists 400L/min or less.
(3) RH, which enters the station, starts to vacuumize, and vacuum degree adds silicon electrolyzation, silicon electrolyzation one in 3000Pa or less into vacuum chamber Secondary property is added in place, and any alloy and slag charge is then not added, and controls after 20~25min, vacuum processing vacuum total processing time Carry out a small amount of Calcium treatment, soft blow time >=15min.
(4) continuous casting is cast using whole process protection.
Removal efficiency of different type field trash during RH is studied through applicant, finds solid inclusions, especially Solid-state Al2O3Field trash, removal efficiency will be much higher than liquid inclusions.In conventional LF-RH refinery practice, although LF is handled Preceding field trash is Al2O3, but handled by LF, field trash is easy to change to calcium-aluminate, thus reduces it in subsequent RH Removal efficiency in the process.In addition, finding that Antaciron and molten steel Si content can by early-stage study and commercial test results Promote LF process Al2O3Field trash changes to calcium-aluminate, this is because the Antaciron of domestic production can contain a small amount of metal Calcium, while under the conditions of LF ladle bottom blowing Ar, molten steel Si content can promote the reaction of slag steel that clinker is caused to pass calcium into molten steel, because This, in order to realize refining at the end of steel inclusion remain as Al2O3, propose that any silicon-containing alloy is not added in tapping and LF process, together When based on RH process slag steel react it is very weak, propose in RH application of vacuum be added silicon electrolyzation carry out Si alloying.Due to tapping and Any silicon-containing alloy is not added in LF process, so that LF process molten steel Si content is very low, therefore, can be pressed down using conventional basicity of slag LF process Al processed2O3Field trash changes to calcium-aluminate, Al in steel at the end of final realization LF2O3It is Control and Inclusion Removal.
A kind of siliceous aluminum killed steel Ultra Low-oxygen smelting process of low-carbon of the invention, terminal S control exists in step (1) 0.015% hereinafter, mainly mitigate LF process desulfurization burden.Any silicon-containing alloy is not added in step (1) and (two), mainly Because molten steel Si content can promote LF process slag steel to react, molten steel is caused to increase calcium.Si is carried out using silicon electrolyzation in step (3) Alloying is primarily due to common Antaciron and contains a small amount of calcium metal.
The present invention can feed a small amount of silicon-calcium wire after broken sky and guarantee molten steel due to having realized that Ultra Low-oxygen is smelted when RH is broken empty Castability, Calcium treatment technique do not influence the total oxygen value of finished product.It is examined through production practices, implements the method for the present invention, it can be total by finished product Within oxygen control to 8ppm.
Progress effect of the invention is: by controlling Antaciron type and addition opportunity etc., can will refine At the end of Control and Inclusion Removal be Al2O3, part field trash contains a small amount of CaO and MgO, and then is realized by subsequent RH vacuum ultralow Oxygen smelts purpose, and T.O can control in 8ppm hereinafter, steel B class and Ds field trash can control at 0.5 grade even 0 grade, economical Significant effect.
Detailed description of the invention
Fig. 1 is that embodiment 1LF terminates steel inclusion analysis chart；
Fig. 2 is that embodiment 2LF terminates steel inclusion analysis chart；
Fig. 3 is that comparative example 1LF terminates steel inclusion analysis chart；
Fig. 4 is that comparative example 2LF terminates steel inclusion analysis chart.
Specific embodiment
20 steel are produced using 130 tons of converters, 130 tons of refining furnaces, 130 tons of RH furnaces.
Embodiment 1:
Finished product composition of steel C:0.21%, Si:0.18%, Mn:0.40%, S:0.009%, Al:0.025%.
Using top and bottom combined blown converter, raw material is molten iron and steel scrap, and scrap ratio 15%, carbon content is after molten iron pretreatment 4.12%, sulfur content 0.003%.Converter is using conventional converting method, and the control of converter terminal temperature at 1638 DEG C, control by terminal S For system 0.012%, terminal C content is 0.085%, and when converter tapping first adds 130kg aluminium cake, 400kg low-carbon ferromanganese, the low nitrogen of 50kg Then 600kg lime and 100kg fluorite is added in carburant.
10min only heats up to molten steel before LF, is warming up to 1554 DEG C of progress liquid steel samplings, 8min composition detection after sampling As a result feedback arrives master control room, and 150kg aluminum shot, 120kg low-carbon ferromanganese and the low nitrogen carburant of 110kg, whole bottom blowing Ar is then added Flow control is in 300~400L/min.LF latter stage adds 30kg aluminum shot, and it is 0.039% that refining, which terminates Al content,.
LF terminates slag composition and is shown in Table 1 (unit: %):
Table 1:
It is solid-state Al that LF, which terminates steel inclusion,2O3, a small amount of MgO and CaO, such as Fig. 1 are contained in field trash:
210kg silicon electrolyzation is added to vacuum chamber in 1000Pa in RH vacuum degree, and any alloy and slag charge, vacuum is then not added Total processing time control feeds 50m silicon-calcium wire after 24min, vacuum processing, and the soft blow time is 18min.
Continuous casting is cast using whole process protection.
The total oxygen variation of molten steel in smelting process are as follows: it is that always oxygen is 7.6ppm, finished product to the broken sky of 19.7ppm, RH that LF, which terminates total oxygen, Total oxygen is 7.2ppm.
Mild steel prepared by embodiment 1 carries out being mingled with analyte detection, using GB/T10561 test stone, field trash grading Are as follows:
Steel B is 0 grade thick, B is 0 grade thin, C is 0 grade thick, C is 0 grade thin, D is 0.5 grade thick, D is 0.5 grade, Ds0.5 grades thin.
Embodiment 2:
Finished product composition of steel are as follows: C:0.20%, Si:0.21%, Mn:0.43%, S:0.006%, Al:0.028%.
Using top and bottom combined blown converter, raw material is molten iron and steel scrap, and scrap ratio 17%, carbon content is after molten iron pretreatment 4.07%, sulfur content 0.004%.Converter is using conventional converting method, and the control of converter terminal temperature at 1647 DEG C, control by terminal S For system 0.014%, terminal C content is 0.097%, and when converter tapping first adds 130kg aluminium cake, 400kg low-carbon ferromanganese, the low nitrogen of 50kg Then 600kg lime and 100kg fluorite is added in carburant.
7min only heats up to molten steel before LF, is warming up to 1558 DEG C of progress liquid steel samplings, 6min composition detection after sampling As a result feedback arrives master control room, and 120kg aluminum shot, 140kg low-carbon ferromanganese and the low nitrogen carburant of 130kg, whole bottom blowing Ar is then added Flow control is in 300~400L/min.LF latter stage adds 50kg aluminum shot, and it is 0.044% that refining, which terminates Al content,.
LF terminates slag composition and is shown in Table 2 (units: %):
Table 2:
It is solid-state Al that LF, which terminates steel inclusion,2O3, a small amount of MgO and CaO, such as Fig. 2 are contained in field trash:
220kg silicon electrolyzation is added to vacuum chamber in 1000Pa in RH vacuum degree, and any alloy and slag charge, vacuum is then not added Total processing time control feeds 50m silicon-calcium wire after 23min, vacuum processing, and the soft blow time is 21min.
The total oxygen variation of smelting process molten steel are as follows: it is that always oxygen is 7.1ppm to the broken sky of 17.6ppm, RH that LF, which terminates total oxygen, and finished product is total Oxygen is 7.3ppm.
Continuous casting is cast using whole process protection.
Mild steel prepared by embodiment 2 carries out field trash and is detected, using GB/T10561 test stone, field trash Grading are as follows:
Steel B is 0.5 grade thick, B is 1.0 grades thin, C is 0 grade thick, C is 0 grade thin, D is 0.5 grade thick, D is 0.5 grade, Ds0 grades thin.
Comparative example 1
Finished product composition of steel are as follows: C:0.20%, Si:0.20%, Mn:0.40%, S:0.005%, Al:0.026%.
Using top and bottom combined blown converter, raw material is molten iron and steel scrap, and scrap ratio 16%, carbon content is after molten iron pretreatment 3.92%, sulfur content 0.003%.Converter is using conventional converting method, and the control of converter terminal temperature at 1629 DEG C, control by terminal S For system 0.011%, terminal C content is 0.078%, converter tapping add 130kg aluminium cake, 350kg ferrosilicon, 480kg low-carbon ferromanganese, Then 600kg lime and 100kg fluorite is added in the low nitrogen carburant of 50kg.
8min only heats up to molten steel before LF, is warming up to 1553 DEG C of progress liquid steel samplings, 7min composition detection after sampling As a result feedback arrives master control room, and 140kg aluminum shot, 80kg low-carbon ferromanganese and the low nitrogen carburant of 110kg, whole bottom blowing Ar stream is then added Amount control is in 300~400L/min.LF latter stage adds 20kg aluminum shot, and it is 0.041% that refining, which terminates Al content,.
LF terminates slag composition and is shown in Table 3 (units: %):
Table 3:
It is liquid or semi liquid state CaO-Al that LF, which terminates steel inclusion,2O3- MgO, such as Fig. 3:
Any alloy and slag charge is not added in RH, and vacuum processing time 22min feeds 50m silicon-calcium wire, soft blow after vacuum processing Time is 25min.
The total oxygen variation of smelting process molten steel are as follows: it is that always oxygen is 12.5ppm to the broken sky of 16.7ppm, RH that LF, which terminates total oxygen, and finished product is total Oxygen is 12.1ppm.
Continuous casting is cast using whole process protection.
Steel prepared by comparative example 1 carry out field trash and are detected, and using GB/T10561 test stone, field trash is commented Grade are as follows:
Steel B is 1.0 grades thick, B is 1.5 grades thin, C is 0 grade thick, C is 0 grade thin, D is 1.0 grades thick, D is 1.0 grades, Ds1.5 grades thin.
Comparative example 2
Finished product composition of steel are as follows: C:0.22%, Si:0.18%, Mn:0.41%, S:0.006%, Al:0.029%.
Using top and bottom combined blown converter, raw material is molten iron and steel scrap, and scrap ratio 17%, carbon content is after molten iron pretreatment 4.10%, sulfur content 0.003%.Converter is using conventional converting method, and the control of converter terminal temperature at 1622 DEG C, control by terminal S System is 0.014%, and terminal C content is 0.095%, and converter tapping adds the low nitrogen carburetting of 130kg aluminium cake, 480kg low-carbon ferromanganese, 50kg Then 600kg lime and 100kg fluorite is added in agent.
10min only heats up to molten steel before LF, is warming up to 1561 DEG C of progress liquid steel samplings, 8min composition detection after sampling As a result feedback arrives master control room, and 150kg aluminum shot, 95kg low-carbon ferromanganese and the low nitrogen carburant of 120kg, whole bottom blowing Ar stream is then added Amount control is in 300~400L/min.LF handles about 30min and 360kg Antaciron is added.LF latter stage adds 35kg aluminum shot, refining Terminating Al content is 0.044%.
LF terminates slag composition and is shown in Table 4 (units: %):
Table 4:
It is liquid or semi liquid state CaO-Al that LF, which terminates steel inclusion,2O3- MgO, such as Fig. 4:
Any alloy and slag charge is not added in RH, and vacuum processing time 20min feeds 50m silicon-calcium wire, soft blow after vacuum processing Time is 28min.
The total oxygen variation of smelting process molten steel are as follows: it is that always oxygen is 13.1ppm to the broken sky of 17.2ppm, RH that LF, which terminates total oxygen, and finished product is total Oxygen is 13.2ppm.
Continuous casting is cast using whole process protection.
Steel prepared by comparative example 2 carry out field trash and are detected, and using GB/T10561 test stone, field trash is commented Grade are as follows:
Steel B is 1.0 grades thick, B is 2.0 grades thin, C is 0 grade thick, C is 0 grade thin, D is 1.0 grades thick, D is 1.0 grades, Ds1.5 grades thin.

Claims (5)

1. a kind of siliceous aluminum killed steel Ultra Low-oxygen smelting process of low-carbon, which is characterized in that mild steel steel grade is used BOF-LF- RH-CC technique is smelted, comprising the following steps:
(1) converter is using conventional converting method, and at 1610~1660 DEG C, terminal S is controlled 0.015% the control of converter terminal temperature Below；
(2) converter tapping first adds aluminium to carry out deoxidation, and subsequent manganese addition iron, low nitrogen carburant carry out alloying, then add lime Slag making is carried out with fluorite；
(3) LF process does not need on the top of the slag killing and carries out top of the slag deoxidation, in slag (TFe+MnO) mainly by with molten steel Middle Al reaction is controlled, and the control of (TFe+MnO) content is 1.20% hereinafter, the control of refining basicity of slag refines knot 5.0~10.0 The control of beam Al content is 0.030~0.045%；
(4) RH, which enters the station, starts to vacuumize, and vacuum degree adds silicon electrolyzation into vacuum chamber in 3000Pa or less, and any alloy is then not added And slag charge, vacuum total processing time control in 20~25min；
(5) continuous casting is cast using whole process protection.
2. Ultra Low-oxygen middle low carbon steel smelting process according to claim 1, it is characterised in that: the low-carbon steel product at It is divided into: C:0.05~0.25%, Si:0.15~0.25%, Mn:0.3~1.5%, S:0.005~0.015%, Al:0.015~ 0.04%, remaining is iron and residual elements.
3. mild steel Ultra Low-oxygen smelting process according to claim 1, it is characterised in that: during step (3) LF, Whole BOTTOM ARGON BLOWING flow control is in 400L/min or less.
4. mild steel Ultra Low-oxygen smelting process according to claim 1, it is characterised in that: the silicon electrolyzation is all in step Suddenly it is added in (4), any silicon-containing alloy is not added in tapping and LF process；The silicon-containing alloy is ferrosilicon, silicomanganese or silicon electrolyzation.
5. the siliceous aluminum killed steel Ultra Low-oxygen smelting process of low-carbon according to claim 1, it is characterised in that: the step (4) a small amount of Calcium treatment, soft blow time >=15min are carried out after being vacuum-treated.
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CN110983161A (en) * 2019-12-05 2020-04-10 中天钢铁集团有限公司 Smelting method for realizing ultrahigh purity of bearing steel by controlling adding time of low-aluminum low-titanium ferrosilicon and combining with tundish electromagnetic stirring
CN113025923A (en) * 2021-02-02 2021-06-25 攀钢集团江油长城特殊钢有限公司 Low-aluminum low-oxygen alloy steel and preparation method thereof
CN113584257A (en) * 2021-08-03 2021-11-02 攀钢集团西昌钢钒有限公司 Method for efficient and economic sedation and aluminum alloying of aluminum killed steel
CN114807491A (en) * 2021-01-28 2022-07-29 上海梅山钢铁股份有限公司 Production method of ultralow-oxygen and sulfide high-spheroidization-rate medium-low-carbon steel molten steel
CN115404392A (en) * 2022-08-08 2022-11-29 攀钢集团攀枝花钢铁研究院有限公司 Method for controlling MnS inclusion morphology of silicon-killed steel
CN115612912A (en) * 2022-10-10 2023-01-17 中天钢铁集团有限公司 Refining method for sulfur control of structural steel for aluminum-containing shaft

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CN115612912A (en) * 2022-10-10 2023-01-17 中天钢铁集团有限公司 Refining method for sulfur control of structural steel for aluminum-containing shaft
CN115612912B (en) * 2022-10-10 2024-03-26 中天钢铁集团有限公司 Refining method for controlling sulfur of structural steel for aluminum-containing shaft

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