JP5463797B2 - 高マンガン極低炭素鋼の溶製方法 - Google Patents
高マンガン極低炭素鋼の溶製方法 Download PDFInfo
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- JP5463797B2 JP5463797B2 JP2009194896A JP2009194896A JP5463797B2 JP 5463797 B2 JP5463797 B2 JP 5463797B2 JP 2009194896 A JP2009194896 A JP 2009194896A JP 2009194896 A JP2009194896 A JP 2009194896A JP 5463797 B2 JP5463797 B2 JP 5463797B2
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- manganese
- dissolved oxygen
- oxygen concentration
- molten steel
- vacuum
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- 239000011572 manganese Substances 0.000 title claims description 95
- 229910052748 manganese Inorganic materials 0.000 title claims description 92
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 title claims description 88
- 238000000034 method Methods 0.000 title claims description 47
- 229910001209 Low-carbon steel Inorganic materials 0.000 title claims description 26
- 238000002844 melting Methods 0.000 title claims description 10
- 230000008018 melting Effects 0.000 title claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 123
- 229910052760 oxygen Inorganic materials 0.000 claims description 123
- 239000001301 oxygen Substances 0.000 claims description 123
- 229910000831 Steel Inorganic materials 0.000 claims description 95
- 239000010959 steel Substances 0.000 claims description 95
- 238000005261 decarburization Methods 0.000 claims description 69
- 238000007664 blowing Methods 0.000 claims description 36
- 239000007789 gas Substances 0.000 claims description 32
- 238000009849 vacuum degassing Methods 0.000 claims description 29
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 27
- 229910001882 dioxygen Inorganic materials 0.000 claims description 27
- 238000004458 analytical method Methods 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 19
- 239000002253 acid Substances 0.000 description 18
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 5
- 238000004868 gas analysis Methods 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 229910000616 Ferromanganese Inorganic materials 0.000 description 4
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 4
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 4
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005115 demineralization Methods 0.000 description 1
- 230000002328 demineralizing effect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Treatment Of Steel In Its Molten State (AREA)
Description
[Mn]+[O]=(MnO) …(1)
但し、(1)式において、[Mn]は溶鋼中のマンガン、[O]は溶鋼中の溶存酸素、(MnO)はスラグ中の酸化マンガンである。
[O]t+Δt-[O]t=(α×qO2,t-β×CCO,t×Et-γ×CCO2,t×Et)×Δt …(2)
但し、(2)式において、[O]t+Δtは、時刻「t+Δt」における溶存酸素濃度、[O]tは、時刻tにおける溶存酸素濃度、qO2,tは、時刻tにおける送酸速度、CCO,tは、時刻tにおける排ガス中のCOガス濃度の割合、CCO2,tは、時刻tにおける排ガス中のCO2ガス濃度の割合、Etは、時刻tにおける排ガス流量、α、β、γは、単位変換係数である。(2)式の妥当性を確認するために、(2)式による溶存酸素濃度の計算値と、溶存酸素濃度の実測値(固体酸素プローブを先端に配置した溶存酸素測定器による測定値)とを比較対比したところ、誤差±5%以内で一致することを確認した。
2 取鍋
3 溶鋼
4 スラグ
5 真空槽
6 上部槽
7 下部槽
8 上昇側浸漬管
9 下降側浸漬管
10 環流用ガス吹き込み管
11 ダクト
12 原料投入口
13 上吹きランス
14 排ガス分析装置
15 酸素濃度演算部
16 酸素濃度モニター
Claims (1)
- マンガンを含有する、真空脱ガス設備の真空槽内の溶鋼に、上吹きランスから酸素ガスを供給し、減圧下での脱炭処理を施して高マンガン極低炭素鋼を溶製するにあたり、前記脱炭処理中に、溶鋼中の溶存酸素濃度を、脱炭処理開始前の溶存酸素濃度、上吹き酸素ガス量、及び排ガスの濃度分析結果に基づいて推定し、溶存酸素濃度の推定の都度、溶存酸素濃度の目標値を溶鋼中のマンガンと溶存酸素との平衡関係から定まる平衡溶存酸素濃度として、推定した溶存酸素濃度に応じて上吹きランスからの酸素ガス供給流量を調整することを特徴とする、高マンガン極低炭素鋼の溶製方法。
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JP2011046984A JP2011046984A (ja) | 2011-03-10 |
JP5463797B2 true JP5463797B2 (ja) | 2014-04-09 |
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Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH01301815A (ja) * | 1988-05-30 | 1989-12-06 | Sumitomo Metal Ind Ltd | 低炭素鋼の溶製方法 |
JP5087840B2 (ja) * | 2005-12-22 | 2012-12-05 | Jfeスチール株式会社 | 真空脱ガス設備における脱炭終点判定方法 |
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