CN113215360A - Deoxidation method of aluminum killed silicon-containing steel - Google Patents
Deoxidation method of aluminum killed silicon-containing steel Download PDFInfo
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- CN113215360A CN113215360A CN202110373687.3A CN202110373687A CN113215360A CN 113215360 A CN113215360 A CN 113215360A CN 202110373687 A CN202110373687 A CN 202110373687A CN 113215360 A CN113215360 A CN 113215360A
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- silicon
- aluminum
- steel
- molten steel
- deoxidation
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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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
-
- 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
- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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
- C21C2007/0093—Duplex process; Two stage processes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a deoxidation method of aluminum killed silicon-containing steel, which comprises the working procedures of converter smelting and LF furnace refining, wherein the working procedure of a converter is as follows: deoxidizing by adopting a silicon-containing deoxidizer in the converter tapping process, and after tapping, adding a top slag modifier to the surface of molten steel, wherein the quantity of the top slag modifier is 400 +/-25 kg per furnace, and the top slag modifier comprises the following components in percentage by mass: al (Al)2O3：9％±1％，CaO：27.5％±1.5％，SiO2：3％±1％，Al：50％±2％，CaF2: 7% +/-1%. A refining procedure: and deoxidizing and slagging by adopting an aluminum deoxidizer. The invention greatly reduces the deoxidation cost and improves the molten steel quality by a two-step deoxidation process, and because the silicon deoxidation is more compatible with the inclusion formed in the molten steel by the aluminum deoxidationThe floating is easy, so the purity of the molten steel is improved, and the quality of the molten steel is improved.
Description
Technical Field
The invention belongs to the technical field of steel making in metallurgical industry, and particularly relates to a deoxidation method of aluminum killed silicon-containing steel.
Background
The steel at the end stage of converter steelmaking smelting is dissolved with excessive oxygen, the excessive oxygen is separated out to form oxide inclusions and bubbles when the molten steel is solidified, the generated oxide inclusions are remained in the steel, the mechanical properties of the steel, such as plasticity, impact toughness and the like, can be reduced, the defects of subcutaneous bubbles, looseness and the like can be generated due to the high oxygen content in the steel, the harm effect of sulfur is intensified, and the quality of casting blanks and steel products is directly influenced. The deoxidation mode of steel grades smelted in steel mills at present generally takes ferro-aluminum deoxidation as a main mode, the advantages of the ferro-aluminum deoxidation are that aluminum crystal grains are fine, the deoxidation effect is very obvious, but the defects are that the ferro-aluminum deoxidation cost is high, and the aluminum deoxidizer is easy to form Al2O3The inclusion causes the phenomenon of water blockage or no down-flow, so a new deoxidation method is needed to reduce the deoxidation cost.
Disclosure of Invention
The invention solves the technical problem that the deoxidation method of the aluminum killed silicon-containing steel comprises the working procedures of converter smelting and LF furnace refining, and comprises the production steps of,
a converter process: deoxidizing by adopting a silicon-containing deoxidizer in the converter tapping process, adding a top slag modifier to the surface of molten steel after tapping, wherein the adding amount is 400 +/-25 kg/furnace, and the top slag modifier comprises the following components in percentage by mass: al (Al)2O3：9％±1％，CaO：27.5％±1.5％，SiO2：3％±1％，Al：50％±2％，CaF2：7％±1％。
A refining process: and deoxidizing and slagging by adopting an aluminum deoxidizer.
Further, the method for determining the addition amount of the silicon-containing deoxidizer comprises the following steps: the silicon deoxidizer is added according to the middle limit of the target silicon content range of the steel grade.
Further, the refining process is LF refining.
Further, the aluminum killed silicon-containing steel has the silicon content of more than 0.10 percent by mass.
Further, in the converter process, no aluminum block is put into the molten steel, and no aluminum wire is fed.
Further, the silicon-containing deoxidizer is ferrosilicon.
Further, the granularity of the slag modifier is phi 30 +/-5 mm.
The design idea of the invention is as follows: adding silicon alloy into molten steel in the converter tapping process, and removing dissolved oxygen in the steel, namely deoxidizing; and the content of the silicon component in the molten steel reaches the target component, namely alloying; because the reaction of silicon and oxygen is more thorough under the condition of high oxygen and the silicon is hardly returned under the condition of oxidizing slag, the cost can be reduced by using the ferrosilicon to replace an aluminum block for deoxidation.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
when the silicon-containing deoxidizer adopts ferrosilicon, the increment of the consumption of the ferrosilicon is less than 10 percent compared with the deoxidation by adding aluminum in the converter tapping, but the consumption of the aluminum in the whole process is reduced by about 30 percent. The invention greatly reduces the deoxidation cost and improves the molten steel quality by a two-step deoxidation process, and the purity of the molten steel is improved and the molten steel quality is improved because the silicon deoxidation is easier to float than the inclusion formed in the molten steel by the aluminum deoxidation.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples 1 to 6
The mass percentage of silicon in the steel grades produced in the embodiments 1-6 is shown in table 1, the smelting process comprises the working procedures of converter smelting and LF furnace refining, the production steps are,
a converter process: the steel tapping process of the converter adopts silicon-containing deoxidizer for deoxidation, no aluminum block is added into the molten steel, and the adding amount of the silicon-containing deoxidizer is shown in table 1. After tapping, adding a ladle top slag modifier to the surface of the molten steel without feeding aluminum wires, wherein the adding amount of the top slag modifier is shown in table 1, the components and the mass percentage content of the top slag modifier are shown in table 2, and the granularity of the top slag modifier is shown in table 2.
A refining process: the molten steel is refined in an LF furnace, and an aluminum deoxidizer is adopted for deoxidation and slagging.
The silicon-containing deoxidizer in the converter procedure can be determined according to the components of the produced steel grade, and can adopt conventional ferrosilicon, manganese-silicon alloy and the like, and the ferrosilicon is adopted in the examples 1 to 6.
The method for determining the addition amount of the ferrosilicon comprises the following steps: the silicon deoxidizer is added according to the middle limit of the target silicon content range of the steel grade. Namely, the calculation is carried out according to the following formula (1):
Walloy (I)＝WTapping×ωMolten steel Si÷aIs collected÷ωAlloy Si （1）
(1) In the formula, WAlloy (I)The addition amount of ferrosilicon, WTappingIs the molten steel tapping quantity, omegaMolten steel SiIs the middle limit of the target silicon content range of the steel grade, aIs collectedThe yield of Si in the ferrosilicon in the whole steel-making process is omegaAlloy SiIs the mass percentage content of Si in the ferrosilicon. Invention aIs collectedTaking 75 +/-2%.
Comparative examples 1 to 2
The mass percentage of silicon in the steel grades produced by the comparative examples 1-2 is shown in table 1, the smelting process comprises the working procedures of converter smelting and LF furnace refining, the production steps are,
a converter process: adding aluminum blocks for deoxidation in the converter tapping process, and then adding ferrosilicon for deoxidation.
A refining process: and refining the molten steel in an LF furnace, and further deoxidizing and slagging by adopting aluminum particles.
TABLE 1
TABLE 2
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (7)
1. The deoxidation method of the aluminum killed silicon-containing steel comprises the working procedures of converter smelting and LF furnace refining, and is characterized in that:
a converter process: deoxidizing by adopting a silicon-containing deoxidizer in the converter tapping process, adding a top slag modifier to the surface of molten steel after tapping, wherein the adding amount is 400 +/-25 kg/furnace, and the top slag modifier comprises the following components in percentage by mass: al (Al)2O3：9％±1％，CaO：27.5％±1.5％，SiO2：3％±1％，Al：50％±2％，CaF2：7％±1％；
A refining process: and deoxidizing and slagging by adopting an aluminum deoxidizer.
2. The method for deoxidizing an aluminum killed silicon-containing steel as claimed in claim 1, wherein the amount of the silicon-containing deoxidizer added is determined by: the silicon deoxidizer is added according to the middle limit of the target silicon content range of the steel grade.
3. The method of claim 1, wherein the refining step is LF refining.
4. The method of claim 1, wherein the aluminum killed silicon-containing steel has a silicon content of > 0.10% by mass.
5. The method of claim 1, wherein the converter step does not include feeding the molten steel with an aluminum ingot and feeding an aluminum wire.
6. The method of claim 1, wherein the silicon-containing deoxidizer is ferrosilicon.
7. The method for deoxidizing an aluminum killed silicon-containing steel as claimed in claim 1, wherein said slag modifier has a particle size of Φ 30 ± 5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110373687.3A CN113215360A (en) | 2021-04-07 | 2021-04-07 | Deoxidation method of aluminum killed silicon-containing steel |
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| CN202110373687.3A CN113215360A (en) | 2021-04-07 | 2021-04-07 | Deoxidation method of aluminum killed silicon-containing steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113862426A (en) * | 2021-09-15 | 2021-12-31 | 北京首钢股份有限公司 | Silicon-aluminum top slag modifier and preparation method and application thereof |
| CN115820981A (en) * | 2022-12-20 | 2023-03-21 | 广东中南钢铁股份有限公司 | Smelting process for reducing large-size inclusion containing silicon in aluminum deoxidized steel |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002363628A (en) * | 2001-06-12 | 2002-12-18 | Kobe Steel Ltd | Hot metal dephosphorizing method |
| CN103074466A (en) * | 2013-01-05 | 2013-05-01 | 河北钢铁股份有限公司邯郸分公司 | Low-cost steel-making process for manufacturing flaw detection plate |
| CN103374642A (en) * | 2012-04-25 | 2013-10-30 | 宝山钢铁股份有限公司 | De-oxidation modifying agent for steel ladle top slag |
| CN107794329A (en) * | 2016-08-31 | 2018-03-13 | 鞍钢股份有限公司 | Method for producing low-silicon-aluminum killed steel by deoxidizing silicon-based alloy in converter |
| CN110117696A (en) * | 2019-06-21 | 2019-08-13 | 本钢板材股份有限公司 | A kind of silicon deoxidization technique of siliceous steel grade |
-
2021
- 2021-04-07 CN CN202110373687.3A patent/CN113215360A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002363628A (en) * | 2001-06-12 | 2002-12-18 | Kobe Steel Ltd | Hot metal dephosphorizing method |
| CN103374642A (en) * | 2012-04-25 | 2013-10-30 | 宝山钢铁股份有限公司 | De-oxidation modifying agent for steel ladle top slag |
| CN103074466A (en) * | 2013-01-05 | 2013-05-01 | 河北钢铁股份有限公司邯郸分公司 | Low-cost steel-making process for manufacturing flaw detection plate |
| CN107794329A (en) * | 2016-08-31 | 2018-03-13 | 鞍钢股份有限公司 | Method for producing low-silicon-aluminum killed steel by deoxidizing silicon-based alloy in converter |
| CN110117696A (en) * | 2019-06-21 | 2019-08-13 | 本钢板材股份有限公司 | A kind of silicon deoxidization technique of siliceous steel grade |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113862426A (en) * | 2021-09-15 | 2021-12-31 | 北京首钢股份有限公司 | Silicon-aluminum top slag modifier and preparation method and application thereof |
| CN115820981A (en) * | 2022-12-20 | 2023-03-21 | 广东中南钢铁股份有限公司 | Smelting process for reducing large-size inclusion containing silicon in aluminum deoxidized steel |
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Application publication date: 20210806 |