JP4062212B2 - Rh脱ガス装置による溶鋼の精錬方法 - Google Patents
Rh脱ガス装置による溶鋼の精錬方法 Download PDFInfo
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- JP4062212B2 JP4062212B2 JP2003299614A JP2003299614A JP4062212B2 JP 4062212 B2 JP4062212 B2 JP 4062212B2 JP 2003299614 A JP2003299614 A JP 2003299614A JP 2003299614 A JP2003299614 A JP 2003299614A JP 4062212 B2 JP4062212 B2 JP 4062212B2
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- molten steel
- refining
- slag
- vacuum chamber
- ladle
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- 229910000831 Steel Inorganic materials 0.000 title claims description 119
- 239000010959 steel Substances 0.000 title claims description 119
- 238000007670 refining Methods 0.000 title claims description 41
- 238000000034 method Methods 0.000 title claims description 20
- 238000007872 degassing Methods 0.000 title claims description 19
- 239000002893 slag Substances 0.000 claims description 64
- 239000000463 material Substances 0.000 claims description 25
- 238000007654 immersion Methods 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 238000005266 casting Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 238000009849 vacuum degassing Methods 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 238000007664 blowing Methods 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 238000009749 continuous casting Methods 0.000 description 3
- 238000005261 decarburization Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000005339 levitation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
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- Treatment Of Steel In Its Molten State (AREA)
Description
い込みを防止することが行われてきた(例えば、特許文献1参照)。また、真空槽1内にスラグ固化材12(例えば、MgO等)を投入し、図1に示すように、MgO等のリッチな固化スラグ層11を本来のスラグ9の下に形成することによって、スラグ9中のFeO,MnOから酸素が溶鋼5中に移行するのを抑制し、溶鋼5中の介在物形成元素が酸化するのを防止する技術もある(例えば、特許文献2参照)。
2 上昇管
3 下降管
4 取鍋
5 溶鋼
6 ガス
7 排気ダクト
8 油圧シリンダー等
9 スラグ
10 敷耐火物
11 固化スラグ層
12 スラグ固化材
Claims (4)
- 取鍋に保持した溶鋼に対し、2本の浸漬管を下部に備えた筒状の真空槽を該浸漬管が該溶鋼中に浸るように配置し、該真空槽内を減圧して該溶鋼を取鍋と真空槽内との間で環流させると共に、該真空槽内にスラグ固化材を投入して溶鋼の精錬処理を行うRH脱ガス装置による溶鋼の精錬方法において、
前記スラグ固化材の投入から最長で5分間経過するまでは、前記真空槽内の溶鋼深さを100mm以上でかつ200mm未満となるように、通常の精錬時より浅くし、その後に該溶鋼への浸漬管の浸漬深さを前記真空槽内の溶鋼深さが400〜500mmとなる通常精錬時の溶鋼深さとして精錬することを特徴とするRH脱ガス装置による溶鋼の精錬方法。 - 前記スラグ固化材をMgOとすることを特徴とする請求項1記載のRH脱ガス装置による溶鋼の精錬方法。
- 前記真空槽内の溶鋼深さを通常の精錬時より浅くするのに、該真空槽に対して配置した取鍋の位置を通常より該真空槽に対して相対的に下降させる操作を行うことを特徴とする請求項1又は2記載のRH脱ガス装置による溶鋼の精錬方法。
- 前記真空槽内の溶鋼深さを通常の精錬時より浅くするのに、該真空槽内の真空度を低下させる操作を行うことを特徴とする請求項1又は2記載のRH脱ガス装置による溶鋼の精錬方法。
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JP2003299614A JP4062212B2 (ja) | 2003-08-25 | 2003-08-25 | Rh脱ガス装置による溶鋼の精錬方法 |
Publications (2)
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JP2005068487A JP2005068487A (ja) | 2005-03-17 |
JP4062212B2 true JP4062212B2 (ja) | 2008-03-19 |
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JP2003299614A Expired - Lifetime JP4062212B2 (ja) | 2003-08-25 | 2003-08-25 | Rh脱ガス装置による溶鋼の精錬方法 |
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Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5891826B2 (ja) * | 2011-02-14 | 2016-03-23 | Jfeスチール株式会社 | 溶鋼の脱硫方法 |
JP6337681B2 (ja) * | 2014-08-12 | 2018-06-06 | 新日鐵住金株式会社 | 溶鋼の減圧精錬方法 |
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