JP2005256027A - 溶鋼中Ti濃度の調整方法 - Google Patents
溶鋼中Ti濃度の調整方法 Download PDFInfo
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- JP2005256027A JP2005256027A JP2004066005A JP2004066005A JP2005256027A JP 2005256027 A JP2005256027 A JP 2005256027A JP 2004066005 A JP2004066005 A JP 2004066005A JP 2004066005 A JP2004066005 A JP 2004066005A JP 2005256027 A JP2005256027 A JP 2005256027A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 63
- 239000010959 steel Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 17
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 16
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title 1
- 239000010936 titanium Substances 0.000 title 1
- 239000002893 slag Substances 0.000 claims abstract description 51
- 238000009826 distribution Methods 0.000 claims abstract description 14
- 230000004907 flux Effects 0.000 claims abstract description 12
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 30
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 14
- 239000002436 steel type Substances 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 abstract description 12
- 239000000956 alloy Substances 0.000 abstract description 12
- 238000003756 stirring Methods 0.000 abstract description 2
- 229910002593 Fe-Ti Inorganic materials 0.000 abstract 1
- 229910005438 FeTi Inorganic materials 0.000 description 10
- 239000000463 material Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910000976 Electrical steel Inorganic materials 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910005347 FeSi Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000011162 core material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000009849 vacuum degassing Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- 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
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
-
- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
【解決手段】新たな溶鋼中Ti濃度の調整法を開発した。その方法は、溶鋼の目標Ti濃度と該溶鋼を処理するスラグの塩基度から、下記(1)式により(質量%TiO2)/[質量%Ti]の分配比を定め、該分配比中、前記スラグの(質量%TiO2)が所定値になるように、TiO2を含有するフラックスを溶鋼上に存在する該スラグに添加すると共に、その後、該スラグを撹拌処理するものである。
(質量%TiO2)/[質量%Ti]=A×[(質量%CaO)/(質量%SiO2)]2−B×[(質量%CaO)/(質量%SiO2)]+C (1)
ここで、[質量%Ti]は溶鋼の目標Ti濃度を、(質量%酸化物)はスラグ中各酸化物の濃度を、A,B,Cはいずれも鋼種により定まる係数である。
【選択図】 図1
Description
(質量%TiO2)/[質量%Ti]=A×[(質量%CaO)/(質量%SiO2)]2−B×[(質量%CaO)/(質量%SiO2)]+C (1)
ここで、[質量%Ti]は溶鋼の目標Ti濃度を、(質量%酸化物)はスラグ中各酸化物の濃度を、A,B,Cはいずれも鋼種により定まる係数である。
(質量%TiO2)/[質量%Ti]=A×[(質量%CaO)/(質量%SiO2)]2−B×[(質量%CaO)/(質量%SiO2)]+C (1)
そして、180トン型上底吹き転炉及び180トン取鍋を使用しての操業で、トランス等の鉄芯素材として用いられる一方向性珪素鋼板という鋼種の製造においては、
(質量%TiO2)/[質量%Ti]=10.374×[(質量%CaO)/(質量%SiO2)]2−176.91×[(質量%CaO)/(質量%SiO2)]+810.77
の関係が得られた。
ステップ1 転炉で溶製している溶鋼中Ti濃度の所望値[質量%Ti]を 決める
ステップ2 溶鋼中Ti濃度の制御を行う鋼種の処理時に生じるスラグの塩 基度(質量%CaO)/(質量%SiO2)を決定する
ステップ3 溶鋼中Ti濃度とスラグの塩基度とから上記式で求まるTiの 分配比(質量%TiO2)/[質量%Ti]から、形成させる スラグ中の(質量%TiO2)の値を定める
ステップ4 転炉から取鍋にスラグを伴う溶鋼を出鋼する
ステップ5 出鋼時に流出したスラグの塩基度を調整する塩基度調整剤(例 えば、CaO)を出鋼時又は出鋼後にスラグへ投入する
ステップ6 前記スラグ中の(質量%TiO2)の値が所定値になるように 、安価なTiO2含有物質を投入する
Claims (1)
- 溶鋼中のTi濃度を調整するに当たり、
溶鋼の目標Ti濃度と該溶鋼を処理するスラグの塩基度から、下記(1)式により(質量%TiO2)/[質量%Ti]の分配比を定め、該分配比中、前記スラグの(質量%TiO2)が所定値になるように、TiO2を含有するフラックスを溶鋼上に存在する該スラグに添加すると共に、その後、該スラグを撹拌処理することを特徴とする溶鋼中Ti濃度の調整方法。
(質量%TiO2)/[質量%Ti]=A×[(質量%CaO)/(質量%SiO2)]2−B×[(質量%CaO)/(質量%SiO2)]+C (1)
ここで、[質量%Ti]は溶鋼の目標Ti濃度を、(質量%酸化物)はスラグ中各酸化物の濃度を、A,B,Cはいずれも鋼種により定まる係数である。
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JP2004066005A JP4225219B2 (ja) | 2004-03-09 | 2004-03-09 | 溶鋼中Ti濃度の調整方法 |
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JP2004066005A JP4225219B2 (ja) | 2004-03-09 | 2004-03-09 | 溶鋼中Ti濃度の調整方法 |
Publications (2)
Publication Number | Publication Date |
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JP2005256027A true JP2005256027A (ja) | 2005-09-22 |
JP4225219B2 JP4225219B2 (ja) | 2009-02-18 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011174102A (ja) * | 2010-02-23 | 2011-09-08 | Jfe Steel Corp | S及びTi含有量の少ない高Si鋼の溶製方法 |
CN106574311A (zh) * | 2014-08-21 | 2017-04-19 | 株式会社神户制钢所 | 钢中Ti浓度的控制方法及硅脱氧钢的制造方法 |
KR20200064328A (ko) | 2018-11-29 | 2020-06-08 | 주식회사 포스코 | Fe-Ti 합금철 투입량 결정 시스템 및 방법 |
-
2004
- 2004-03-09 JP JP2004066005A patent/JP4225219B2/ja not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011174102A (ja) * | 2010-02-23 | 2011-09-08 | Jfe Steel Corp | S及びTi含有量の少ない高Si鋼の溶製方法 |
CN106574311A (zh) * | 2014-08-21 | 2017-04-19 | 株式会社神户制钢所 | 钢中Ti浓度的控制方法及硅脱氧钢的制造方法 |
EP3184652A4 (en) * | 2014-08-21 | 2018-04-04 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Method for controlling ti concentration in steel, and method for producing silicon-deoxidized steel |
KR20200064328A (ko) | 2018-11-29 | 2020-06-08 | 주식회사 포스코 | Fe-Ti 합금철 투입량 결정 시스템 및 방법 |
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JP4225219B2 (ja) | 2009-02-18 |
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