CN114480944A - Preparation method of ultralow-carbon low-silicon low-aluminum steel - Google Patents
Preparation method of ultralow-carbon low-silicon low-aluminum steel Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 83
- 239000010959 steel Substances 0.000 title claims abstract description 83
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 57
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 51
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 44
- 239000010703 silicon Substances 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 100
- 229910052742 iron Inorganic materials 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 38
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000007670 refining Methods 0.000 claims abstract description 36
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000003723 Smelting Methods 0.000 claims abstract description 30
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 16
- 230000023556 desulfurization Effects 0.000 claims abstract description 16
- 238000005266 casting Methods 0.000 claims abstract description 10
- 239000002245 particle Substances 0.000 claims abstract description 6
- 238000007667 floating Methods 0.000 claims abstract description 5
- 239000002893 slag Substances 0.000 claims description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 15
- 229910052760 oxygen Inorganic materials 0.000 claims description 15
- 239000001301 oxygen Substances 0.000 claims description 15
- 238000009749 continuous casting Methods 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 6
- 239000011707 mineral Substances 0.000 claims description 6
- 238000005261 decarburization Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000012141 concentrate Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 238000007872 degassing Methods 0.000 claims description 3
- 238000007885 magnetic separation Methods 0.000 claims description 3
- 239000006148 magnetic separator Substances 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims description 2
- 230000000903 blocking effect Effects 0.000 claims 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims 1
- 230000003749 cleanliness Effects 0.000 abstract description 3
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010407 vacuum cleaning Methods 0.000 description 1
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- 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
- C21C7/068—Decarburising
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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Abstract
The invention discloses a preparation method of ultra-low carbon low silicon low aluminum steel, which comprises the following steps: ore smelting: processing the iron ore, and smelting the processed iron ore into molten iron; and (3) desulfurization treatment: carrying out desulfurization treatment on the smelted molten iron; pretreatment: sequentially carrying out dephosphorization treatment and molten steel rough smelting on the molten iron subjected to desulfurization treatment; refining treatment: refining the molten steel obtained by the rough smelting of the molten steel. The preparation method of the ultralow-carbon low-silicon low-aluminum steel reduces the process flow, reduces the process cost, can complete deoxidation and more accurately control the Als content, meets the requirement that the Als content of the product is less than or equal to 0.010 percent, reduces the consumption of aluminum particles for deoxidation, prevents secondary oxidation of molten steel, promotes full floating removal of inclusions, ensures high cleanliness of a casting blank, and has good application prospect.
Description
Technical Field
The invention relates to the field of steel processing, in particular to a preparation method of ultra-low-carbon low-silicon low-aluminum steel.
Background
The production of the steel-based composite plate needs special steel which is ultra-low carbon low silicon low aluminum steel, and the components of the product are the closest to those of pure iron.
The existing ultra-low carbon low silicon low aluminum steel usually adopts a production process of pure iron, and the main process route of the pure iron comprises molten iron pretreatment (desulphurization or desilication dephosphorization desulphurization) → (LF) → converter (double slag process or dephosphorization pretreatment) → VD or RH refining → continuous casting (full-protection pouring). The main problems and characteristics are as follows:
1) the requirements of elements such as C, Mn, P, S and the like are more strict, the production process of the pure iron is relatively complex, and the cost is higher;
2) the method comprises the following steps of firstly carrying out ultra-low carbon smelting on pure iron in a refining process, removing carbon content as far as possible, and having high residual oxygen content and oxygen content in slag after decarburization, so that adverse effects on subsequent oxygen control are caused;
3) the requirement of Al element is relatively loose, which is beneficial to pure iron deoxidation with aluminum. Aiming at the problems and the characteristics, a preparation method of the ultra-low-carbon low-silicon low-aluminum steel is provided.
Disclosure of Invention
The invention mainly aims to provide a preparation method of ultra-low-carbon low-silicon low-aluminum steel, which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
a preparation method of ultra-low carbon low silicon low aluminum steel comprises the following steps:
(1) and ore smelting: processing the iron ore, and smelting the processed iron ore into molten iron;
(2) and desulfurization treatment: carrying out desulfurization treatment on the smelted molten iron;
(3) and (3) pretreatment: sequentially carrying out dephosphorization treatment and molten steel rough smelting on the molten iron subjected to desulfurization treatment;
(4) and refining treatment: refining molten steel obtained by rough smelting of the molten steel;
(5) and slab continuous casting: and performing slab continuous casting on the refined molten steel to obtain the ultra-low-carbon low-silicon low-aluminum steel.
Preferably, the iron ore treatment in step (1) comprises the following steps:
i, feeding the iron ore into a crusher for crushing; obtaining mineral powder;
II, feeding the mineral powder into a magnetic separator for magnetic separation to obtain iron concentrate powder;
and III, sintering and smelting the fine iron powder to obtain molten iron.
Preferably, the molten iron is subjected to deep desulfurization treatment by a mixed blowing method in the step (2).
Preferably, in the step (3), a top-bottom combined blown converter is adopted for dephosphorization and rough smelting of the molten steel, a slag stopping device is adopted in the rough smelting stage of the molten steel, and the tapping temperature after the rough smelting of the molten steel is 1620-.
Preferably, the slag stopping device comprises a sliding plate slag stopping module and a slag discharging detection module, and the slag discharging detection module adopts an infrared detection module.
Preferably, the refining treatment in the step (4) comprises ladle refining furnace refining and RH vacuum refining, wherein the ladle refining furnace refining is heated, and the temperature of the molten steel is 1620-1650 ℃ after the heating.
Preferably, the RH vacuum refining comprises the steps of:
A. performing decarburization treatment on the molten steel refined by the ladle refining furnace;
B. determining oxygen by adopting an oxygen determination instrument, calculating the aluminum consumption, and adding aluminum particles into a feeding device according to the aluminum consumption for complete deoxidation;
C. removing the inclusions in the deoxidized molten steel.
Preferably, in the step C, the inclusions in the deoxidized molten steel are removed by RH vacuum stirring to sufficiently float the inclusions such as alumina, and then the impurities are removed by a high vacuum clean cycle degassing method.
Preferably, the slab continuous casting in the step (5) adopts a slab caster, and a large ladle long nozzle anaerobic protection casting, a tundish ventilating stopper rod, a tundish upper nozzle argon seal, an immersion nozzle protection casting, a low-carbon low-silicon covering agent and ultra-low-carbon special covering slag are adopted in the continuous casting process.
Preferably, the weight percentage of elements in the ultra-low carbon low silicon low aluminum steel obtained in the step (5) is less than or equal to 0.010 percent of C, less than or equal to 0.010 percent of Si, less than or equal to 0.35 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.010 percent of Als, less than or equal to 0.03 percent of Ni, less than or equal to 0.04 percent of Cr, less than or equal to 0.05 percent of Cu, and the weight percentage of the elements is Fe.
Compared with the prior art, the preparation method of the ultralow-carbon low-silicon low-aluminum steel has the following beneficial effects:
compared with the prior art that the ultra-low carbon low silicon low aluminum steel is produced by adopting a pure iron process, the preparation method of the ultra-low carbon low silicon low aluminum steel reduces desiliconization and dephosphorization processes in a molten iron three-dehydration process or a double slag process of a converter, reduces process flows and reduces process cost;
the preparation method of the ultralow-carbon low-silicon low-aluminum steel can complete deoxidation and more accurate control of Als content while controlling the ultralow carbon content by using carbon and oxygen, meets the requirement that the Als content of a product is less than or equal to 0.010 percent, and reduces the consumption of aluminum particles for deoxidation;
according to the preparation method of the ultra-low-carbon low-silicon low-aluminum steel, disclosed by the invention, multiple protection means are adopted on a slab caster to prevent secondary oxidation of molten steel and promote full floating removal of inclusions, so that high cleanliness of a casting blank is ensured, and the preparation method has a good application prospect.
Drawings
FIG. 1 is a flow chart of a method for preparing ultra-low carbon, low silicon and low aluminum steel according to the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Example 1
A preparation method of ultra-low carbon low silicon low aluminum steel comprises the following steps:
(1) and ore smelting: processing the iron ore, and smelting the processed iron ore into molten iron;
the iron ore treatment in the step (1) comprises the following steps:
i, feeding the iron ore into a crusher for crushing; obtaining mineral powder;
II, feeding the mineral powder into a magnetic separator for magnetic separation to obtain iron concentrate powder;
and III, sintering and smelting the fine iron powder to obtain molten iron.
(2) And desulfurization treatment: carrying out desulfurization treatment on the smelted molten iron;
and carrying out deep desulfurization treatment on the molten iron by adopting a mixed blowing method.
(3) And (3) pretreatment: sequentially carrying out dephosphorization treatment and molten steel rough smelting on the molten iron subjected to desulfurization treatment;
a top-bottom combined blown converter is adopted for dephosphorization and molten steel rough smelting, a slag stopping device is adopted in the molten steel rough smelting stage, and the tapping temperature after the molten steel rough smelting is 1668 ℃;
the slag stopping device comprises a sliding plate slag stopping module and a slag discharging detection module, and the slag discharging detection module adopts an infrared detection module.
After the liquid steel is coarsely smelted, the carbon content in the liquid steel is 0.04-0.07%, and the oxygen content in the liquid steel is 0.04-0.08%.
(4) And refining treatment: refining molten steel obtained by rough smelting of the molten steel;
the refining treatment comprises ladle refining furnace refining and RH vacuum refining, wherein the ladle refining furnace refining is heated, and the temperature of molten steel is 1642 ℃ after heating;
the RH vacuum refining comprises the following steps:
A. performing decarburization treatment on the molten steel refined by the ladle refining furnace;
B. oxygen is determined by adopting an oxygen determination instrument, the aluminum consumption is calculated, and a feeding device carries out complete deoxidation according to the aluminum consumption by adding aluminum particles;
C. removing impurities in the deoxidized molten steel;
when removing the inclusions in the deoxidized molten steel, RH vacuum stirring is utilized to fully finish the floating of the inclusions such as alumina and the like, and then a high vacuum cleaning circulation degassing method is adopted to remove the impurities.
RH vacuum refining utilizes high vacuum condition carbon-oxygen reaction (oxygen compensation is properly blown when oxygen content is insufficient), can realize the ultra-low carbon range of about 0.005 percent of carbon content, and the residual oxygen content is less than or equal to 0.02 percent.
(5) And slab continuous casting: performing slab continuous casting on the refined molten steel to obtain ultra-low carbon low silicon low aluminum steel;
the slab continuous casting adopts a slab continuous casting machine, and the continuous casting process adopts ladle long nozzle anaerobic protection casting, tundish permeable stopper rod, tundish upper nozzle argon sealing, submerged nozzle protection casting, low-carbon low-silicon covering agent and ultra-low-carbon special covering slag.
The weight percentage of elements in the ultra-low carbon, low silicon and low aluminum steel is less than or equal to 0.010 percent of C, less than or equal to 0.010 percent of Si, less than or equal to 0.35 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.010 percent of Als, less than or equal to 0.03 percent of Ni, less than or equal to 0.04 percent of Cr and less than or equal to 0.05 percent of Cu, which are Fe.
The parameters of the steps of ore smelting, desulfurization treatment and refining treatment are the same as the parameters of the pure iron process in the prior art, and the preparation method is developed for the ultra-low-carbon low-silicon low-aluminum steel and mainly has the functions of reducing the process flow and reducing the process cost.
Compared with the prior art in which a pure iron process is adopted to produce the ultra-low carbon low silicon low aluminum steel, the method for preparing the ultra-low carbon low silicon low aluminum steel reduces desiliconization and dephosphorization processes in a molten iron three-dehydration process or a double slag process of a converter, reduces process flows and reduces process cost; the preparation method of the ultralow-carbon low-silicon low-aluminum steel can complete deoxidation and more accurate control of Als content while controlling the ultralow carbon content by using carbon and oxygen, meets the requirement that the Als content of a product is less than or equal to 0.010 percent, and reduces the consumption of aluminum particles for deoxidation; according to the preparation method of the ultra-low-carbon low-silicon low-aluminum steel, disclosed by the invention, multiple protection means are adopted on a slab caster to prevent secondary oxidation of molten steel and promote full floating removal of inclusions, so that high cleanliness of a casting blank is ensured, and the preparation method has a good application prospect.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The preparation method of the ultra-low carbon low silicon low aluminum steel is characterized by comprising the following steps:
(1) and ore smelting: processing the iron ore, and smelting the processed iron ore into molten iron;
(2) and desulfurization treatment: carrying out desulfurization treatment on the smelted molten iron;
(3) and (3) pretreatment: sequentially carrying out dephosphorization treatment and molten steel rough smelting on the molten iron subjected to desulfurization treatment;
(4) and refining treatment: refining molten steel obtained by the rough smelting of the molten steel;
(5) and slab continuous casting: and performing slab continuous casting on the refined molten steel to obtain the ultra-low-carbon low-silicon low-aluminum steel.
2. The method for preparing the ultra-low carbon low silicon low aluminum steel as claimed in claim 1, wherein: the iron ore treatment in the step (1) comprises the following steps:
i, feeding the iron ore into a crusher for crushing; obtaining mineral powder;
II, feeding the mineral powder into a magnetic separator for magnetic separation to obtain iron concentrate powder;
and III, sintering and smelting the fine iron powder to obtain molten iron.
3. The method for preparing the ultra-low carbon low silicon low aluminum steel as claimed in claim 1, wherein: and (3) carrying out deep desulfurization treatment on the molten iron by adopting a mixed blowing method in the step (2).
4. The method for preparing the ultra-low carbon low silicon low aluminum steel as claimed in claim 1, wherein: and (3) carrying out dephosphorization treatment and molten steel rough smelting by adopting a top-bottom combined blown converter, wherein a slag blocking device is adopted in the molten steel rough smelting stage, and the tapping temperature after the molten steel rough smelting is 1620-1680 ℃.
5. The method for preparing the ultra-low carbon low silicon low aluminum steel as claimed in claim 4, wherein: the slag stopping device comprises a sliding plate slag stopping module and a slag discharging detection module, and the slag discharging detection module adopts an infrared detection module.
6. The method for preparing the ultra-low carbon low silicon low aluminum steel as claimed in claim 5, wherein: the refining treatment in the step (4) comprises ladle refining furnace refining and RH vacuum refining, wherein the ladle refining furnace refining is heated, and the temperature of the molten steel is 1620-.
7. The method for preparing the ultra-low carbon low silicon low aluminum steel as claimed in claim 6, wherein: the RH vacuum refining comprises the following steps:
A. performing decarburization treatment on the molten steel refined by the ladle refining furnace;
B. oxygen is determined by adopting an oxygen determination instrument, the aluminum consumption is calculated, and a feeding device carries out complete deoxidation according to the aluminum consumption by adding aluminum particles;
C. removing the inclusions in the deoxidized molten steel.
8. The method for preparing the ultra-low carbon low silicon low aluminum steel as claimed in claim 7, wherein: and C, when removing the inclusions in the deoxidized molten steel in the step C, fully finishing the floating of the inclusions such as aluminum oxide and the like by using RH vacuum stirring, and then removing the impurities by using a high-vacuum clean circulating degassing method.
9. The method for preparing the ultra-low carbon low silicon low aluminum steel as claimed in claim 2, wherein: and (5) continuously casting the slab blank by using a slab continuous casting machine, wherein in the continuous casting process, a large-ladle long-nozzle anaerobic protection casting, a tundish breathable stopper rod, a tundish upper nozzle argon seal, an immersion nozzle protection casting, a low-carbon low-silicon covering agent and ultra-low-carbon special covering slag are adopted.
10. The method for preparing the ultra-low carbon low silicon low aluminum steel as claimed in claim 1, wherein: the weight percentage of elements in the ultra-low carbon low silicon low aluminum steel obtained in the step (5) is less than or equal to 0.010 percent of C, less than or equal to 0.010 percent of Si, less than or equal to 0.35 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.010 percent of Als, less than or equal to 0.03 percent of Ni, less than or equal to 0.04 percent of Cr, less than or equal to 0.05 percent of Cu, and the weight percentage of the elements is Fe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111456973.2A CN114480944A (en) | 2021-11-29 | 2021-11-29 | Preparation method of ultralow-carbon low-silicon low-aluminum steel |
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| CN202111456973.2A CN114480944A (en) | 2021-11-29 | 2021-11-29 | Preparation method of ultralow-carbon low-silicon low-aluminum steel |
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| US20200056254A1 (en) * | 2017-03-31 | 2020-02-20 | South China University Of Technology | Method for manufacturing thin-specification high-ti wear-resistant steel nm450 |
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| CN101117661A (en) * | 2006-07-31 | 2008-02-06 | 郭元杰 | Method for producing iron concentrate by brown hematite and siderite and reduction roaster |
| CN102719593A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Method for smelting ultra-low carbon steel |
| CN105018669A (en) * | 2015-07-15 | 2015-11-04 | 邢台钢铁有限责任公司 | Method for producing technically pure iron for nuclear power |
| US20200056254A1 (en) * | 2017-03-31 | 2020-02-20 | South China University Of Technology | Method for manufacturing thin-specification high-ti wear-resistant steel nm450 |
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