JPS63262412A - Method for cleaning molten steel - Google Patents
Method for cleaning molten steelInfo
- Publication number
- JPS63262412A JPS63262412A JP9539787A JP9539787A JPS63262412A JP S63262412 A JPS63262412 A JP S63262412A JP 9539787 A JP9539787 A JP 9539787A JP 9539787 A JP9539787 A JP 9539787A JP S63262412 A JPS63262412 A JP S63262412A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- molten
- slag
- steel
- molten slag
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 75
- 239000010959 steel Substances 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims description 21
- 238000004140 cleaning Methods 0.000 title claims description 8
- 239000002893 slag Substances 0.000 claims abstract description 47
- 239000011261 inert gas Substances 0.000 claims abstract description 18
- 238000007670 refining Methods 0.000 claims abstract description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 10
- 239000002253 acid Substances 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000007667 floating Methods 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 235000012255 calcium oxide Nutrition 0.000 claims description 5
- 239000000292 calcium oxide Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 abstract description 12
- 239000007789 gas Substances 0.000 abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052782 aluminium Inorganic materials 0.000 abstract description 3
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 230000001590 oxidative effect Effects 0.000 abstract description 3
- 238000007664 blowing Methods 0.000 abstract description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- -1 and T Substances 0.000 abstract 1
- 239000003638 chemical reducing agent Substances 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 230000003009 desulfurizing effect Effects 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 238000007654 immersion Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000007796 conventional method Methods 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 238000011109 contamination Methods 0.000 description 5
- 238000002407 reforming Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 3
- 238000009749 continuous casting Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000002784 sclerotic effect Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910002551 Fe-Mn Inorganic materials 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 210000003786 sclera Anatomy 0.000 description 1
- 238000010517 secondary reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は溶鋼の清浄化方法に関し、詳しくは溶鋼表向に
浮上し几溶融スラグの改質による脱酸生成物の吸着除去
方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for cleaning molten steel, and more particularly to a method for adsorbing and removing deoxidized products by modifying molten slag that floats on the surface of molten steel.
（従来の技術）
一般に、転炉等でｍ製された溶鋼は成分調整及び脱酸調
整を実施し、溶鋼中の酸素量を制御している。し力為し
、溶鋼上部に存在する酸化溶融スラグは完全には脱酸さ
れていない九め、脱酸剤添加η島らＷｊ！ＩＡ凝固まで
の時間に溶鋼中の酸素との親和力の強い元素（例えばＡ
／等）と溶鋼上部に存在する酸化溶融スラグ（例えば酸
化Ｆｅ−Ｍｎ等）とが反応し、脱酸物を生成する。この
結果、鋼中酸素量制御が著しく損なわれると共に、生成
し九脱酸物が鋼の製品品質劣化の原因となっている。(Prior Art) Generally, molten steel produced in a converter or the like is subjected to composition adjustment and deoxidization adjustment to control the amount of oxygen in the molten steel. However, the oxidized molten slag present at the top of the molten steel is not completely deoxidized. During the time until IA solidification, elements with a strong affinity for oxygen in molten steel (for example, A
/, etc.) and the oxidized molten slag (for example, oxidized Fe-Mn, etc.) present in the upper part of the molten steel to generate a deoxidized product. As a result, the control of the amount of oxygen in the steel is significantly impaired, and the produced nine-deoxidized products are the cause of deterioration in the quality of steel products.
従って１例えば特開昭６０−１６２７１９号公報に示さ
れるように、取鍋あるいは精錬容器内の１ＷｆＩ４上に
精錬スラグを形成し、容器底部からＡｒ等の不活性ガス
を、上方よりスラグと溶鋼の近傍に浸漬ランスを浸漬し
て不活性ガスと精錬用フラックスとを吹込み、スラグ−
溶鋼間の反応効率を向上させる方法が提案されている。Therefore, as shown in JP-A-60-162719, for example, refining slag is formed on 1WfI4 in a ladle or refining vessel, and an inert gas such as Ar is supplied from the bottom of the vessel to the slag and molten steel from above. An immersion lance is immersed nearby and inert gas and refining flux are blown into the slag.
Methods have been proposed to improve the reaction efficiency between molten steel.
しかし、この方法全前記の溶鋼の清浄化に用いても浮上
したスラグと溶鋼全体が反応し、容器内の溶鋼の汚染を
招く。ま７ｔ、溶鋼中の８ｉ、Ｍｎ、あるいはＴｉ、Ｂ
等の有価元素の酸化消失を生じるとともに、処理時の温
度低下が大きく継続する連鋳工程において、ノズル絞り
による鋳造中断あるいは介在物に起因し九品質欠陥を生
じる等の欠点が有＃る。However, even if this method is used to clean the molten steel, the entire molten steel reacts with the floating slag, resulting in contamination of the molten steel in the container. 7t, 8i, Mn, or Ti, B in molten steel
In addition to oxidation loss of valuable elements such as, there are drawbacks such as quality defects due to interruption of casting due to nozzle throttling or inclusions in the continuous casting process where the temperature during treatment continues to decrease significantly.
（発明が解決しようとする問題点）
本発明は、スラグ改質による溶鋼の清浄化に際し、従来
方法の欠点であるスラグと溶鋼の全体的な攪拌と反応を
抑制し、溶鋼の汚染と有価元素の損失を防止するととも
に、迅速な改質および温度の低下の抑制により連鋳工程
の負荷をも解消する溶鋼の清浄化方法を′提供する。(Problems to be Solved by the Invention) When cleaning molten steel by slag modification, the present invention suppresses the overall agitation and reaction of slag and molten steel, which are the drawbacks of conventional methods, and prevents contamination of molten steel and valuable elements. To provide a method for cleaning molten steel that prevents the loss of steel and also eliminates the burden of a continuous casting process by rapid reforming and suppressing a drop in temperature.
（問題点を解決する丸めの手段）
本発明は、精錬工程を経て溶融金属容器に出湯された溶
鋼の上面に浮上し九酸化溶融スラグの表面に強膜酸剤を
添加し、ランスを溶鋼瀞面に対し０〜５００１１１１の
浸漬深さにして不活性ガスまたは不活性ガスと生石灰粉
を吹込みスラグ中のＴ、Ｐｅを３係以下とし１次いで該
溶融金属容器の溶鋼表面より１０００圏以上の深さ力為
ら不活性ガスを吹込み前工程の脱酸生成物を浮上除去す
ることを特徴とする溶鋼の清浄化方法である。(Means of rounding to solve the problem) The present invention involves adding a sclerotic acid to the surface of the molten slag that floats to the top of the molten steel poured into a molten metal container after the refining process, and then using a lance to remove the molten steel from the molten steel. Inert gas or inert gas and quicklime powder is blown into the slag to an immersion depth of 0 to 5001111 to reduce T and Pe in the slag to below 3 coefficients.1. This method of cleaning molten steel is characterized by blowing inert gas at a deep depth to float away the deoxidized products from the previous process.
（作用）
前述し丸ように、溶鋼中への脱酸剤添加（溶鋼中酸素量
制御）では１ｍ鋼上部に存在する酸化性溶融スラグによ
って脱酸剤添加後から凝固（鋳造）完了点に鋼中酸素量
制御が著しく損なわれ、且つ生成しｔ脱酸物が鋼の製品
品質劣化の原因となる。(Function) As mentioned above, when adding a deoxidizer to molten steel (controlling the amount of oxygen in molten steel), the oxidizing molten slag present at the top of the 1m steel causes the steel to reach the point of completion of solidification (casting) after the addition of the deoxidizer. Control of the amount of oxygen in the atmosphere is significantly impaired, and the deoxidized products that are generated cause deterioration in the quality of steel products.
これを解決する比めには、溶鋼上部の酸化性溶融スラグ
を改質し、溶鋼が脱酸生成物の影響を極力受けないよう
にする必要がある。しかも、溶融金属容器（以下取鍋と
称する）に浮上したスラグを溶鋼との攪拌接触を抑制し
次状態で迅速に改質する必要がある。そして、この浮上
スラグの改質後に溶鋼全体を攪拌し、Ｆｊ銅鋼中潜在し
皮膜酸生成物、あるいは耐火物の溶損による酸化物等か
らなる介在物を浮上させて改質スラグに吸着させること
により、従来の方法では得られない溶鋼の清浄化が達成
される。To solve this problem, it is necessary to modify the oxidizing molten slag above the molten steel so that the molten steel is not affected by deoxidation products as much as possible. Moreover, it is necessary to prevent the slag floating in the molten metal container (hereinafter referred to as a ladle) from coming into contact with the molten steel while rapidly reforming the slag in the next state. After the floating slag is modified, the entire molten steel is stirred, and the inclusions, which are latent in the FJ copper steel and consist of film acid products or oxides caused by melting of the refractory, are brought to the surface and adsorbed to the modified slag. This achieves cleaning of the molten steel that cannot be achieved with conventional methods.
このため本発明は、精錬工程を経由してき文末脱酸ある
いは脱酸処理を施し九溶鋼の上部にある酸化溶融スラブ
の表面へ例えばＡ／、アルミドロス等の強脱酸剤ＩＩ−
溶融スラグ中酸化Ｆｅ、Ｍｎ を十分還元出来る量だ
け添加する。脱酸剤を酸化溶融スラグの表面に添加し、
これに浅浸漬（０〜５００ｎｍ）ランスにより不活性ガ
スまたは不活性ガスと生石灰粉の吹込みを行なうことに
より、単に脱酸剤を浸漬吹込みする方法に比し脱酸剤の
飛散ロスを大巾に抑制し、シ〃為も反応は極めて迅速に
行ない得る。For this reason, the present invention applies deoxidizing treatment or deoxidizing treatment to the surface of the oxidized molten slab located on the upper part of the molten steel through the refining process and applies a strong deoxidizing agent such as A/, aluminum dross, etc. to the surface of the oxidized molten slab.
Oxidized Fe and Mn are added in the molten slag in an amount sufficient to reduce them sufficiently. Adding a deoxidizing agent to the surface of the oxidized molten slag,
By injecting inert gas or inert gas and quicklime powder into this using a shallow immersion (0 to 500 nm) lance, the scattering loss of the deoxidizer is greatly reduced compared to the method of simply immersing and injecting the deoxidizer. Even if the reaction is suppressed to a large extent, the reaction can be carried out extremely quickly.
この浅浸漬ランスによる不活性ガスまｔは不活性ガスと
生石灰粉の吹込みは、取鍋内にランスを田溶鋼表面より
０〜５００鵡に浸漬させ、不活性ガス（Ａｒ、 Ｃｏ２
＝ Ｎ２等）ま九は不活性ガスと生石灰粉による強制攪
拌を実施し、溶融スラグと強膜酸剤との反応を促進させ
る。当工程で強制攪拌をさせるランスの浸漬位置及び不
活性ガス流量は。The injection of inert gas and quicklime powder using this shallowly immersed lance is carried out by immersing the lance in the ladle at a depth of 0 to 500 m from the surface of the molten steel, and injecting inert gas (Ar, Co2) into the ladle.
= N2, etc.) Maku implements forced stirring using inert gas and quicklime powder to promote the reaction between the molten slag and the sclera acid agent. What is the immersion position of the lance used for forced stirring in this process and the flow rate of the inert gas?
溶融スラグと強膜酸剤との反応を促進させ、かつ極力溶
鋼への影響を避ける量とするのが重要である。これは、
溶融スラグと強膜酸剤との反応によって生成する脱酸生
成物が溶鋼中へ侵入するのを回避し１強制攪拌時の溶鋼
湯面変動による溶鋼の大気酸化を極力防止する九めに重
要である。It is important to select an amount that promotes the reaction between the molten slag and the sclero-acid and avoids as much influence on the molten steel as possible. this is,
Ninth, it is important to avoid the intrusion of deoxidizing products produced by the reaction between molten slag and sclerotic acid into the molten steel, and to prevent as much as possible atmospheric oxidation of the molten steel due to fluctuations in the molten steel level during forced stirring. be.
脱酸生成物の侵入深さは＠１図に示すようにランス浸漬
深さ５００目η為ら急激に深くなる。一方。As shown in Figure @1, the penetration depth of the deoxidized product becomes steeper from the lance immersion depth η of 500 mm. on the other hand.
溶鋼表面（浸漬深さ中Ｏ）より浅くなると攪拌が不十分
となり、スラグ改質が行なわれない。この几め浸漬深さ
ＬはＯ・〜５００ｍ１１とすることが必要である。この
脱酸剤の添加と攪拌によってスラグは迅速還元されてス
ラグ中のＴｏＦｅを３％以下。If it becomes shallower than the molten steel surface (immersion depth O), stirring will be insufficient and slag modification will not be performed. This reduced immersion depth L needs to be 0.~500 m11. By adding this deoxidizing agent and stirring, the slag is quickly reduced to reduce the ToFe content in the slag to 3% or less.
好ましくｔｉ１４以下とする。このＴ ｅ Ｆｅが高い
と十分な浮上介在物の吸着ができず、逆に溶鋼汚染を招
く。Preferably the ti is 14 or less. If this T e Fe is high, floating inclusions cannot be sufficiently adsorbed, and conversely, molten steel contamination occurs.
次に、取鍋の溶鋼表面よりｔ ｏ ｏ ｏＩＤＩ以上浸
漬した位置から不活性ガス（Ａｒ、 ００２． Ｎ２等
）を溶鋼表面が改質し次溶融スラグ表面に露出しないガ
ス流量：５０〜３００１／−吹込んで攪拌し、溶鋼中へ
侵入し次脱酸生成物を浮上させる。最終のガス吹き込み
深さがｔ ｏ ｏ ｏｍより浅くなると、第１図に示す
ように溶鋼の全体攪拌が抑制され改質スラブの介在物吸
着と介在物の撹拌浮上の相乗効果が極めて小さくなる。Next, the molten steel surface is modified with an inert gas (Ar, 002, N2, etc.) from a position immersed in the molten steel surface of the ladle at least t0o IDI, and then gas flow rate: 50 to 3001 / - Inject and stir to penetrate into the molten steel and float the deoxidized products. When the final gas injection depth becomes shallower than t o o om, as shown in FIG. 1, the overall stirring of the molten steel is suppressed, and the synergistic effect of adsorption of inclusions in the reforming slab and stirring and flotation of the inclusions becomes extremely small.
このように１本発明は初期においては溶鋼の汚染及び温
度ロス等を防止してスラグの迅速還元改質を行ない、継
続する溶鋼の全体攪拌による介在物浮上と改質スラグの
吸着により極めて効果的に溶鋼の清浄化を達成する。In this way, the present invention prevents contamination of molten steel and temperature loss, etc. in the initial stage, performs rapid reduction reforming of slag, and is extremely effective due to the floating of inclusions and adsorption of reformed slag by continuous stirring of the entire molten steel. Achieve cleaning of molten steel.
（実施例） 転炉で精錬された溶５ｉ／４を取締に出湯する際に。(Example) When tapping the molten 5i/4 refined in the converter for inspection.
所定の脱酸剤と合金鉄を施〃口し１表１に示すようなＡ
／ −Ｋ鋼を得次。この脱酸・成分調整後の溶鋼上部
にある酸化溶融スラグにＡ／系会合金鉄添加し−た。こ
の後金属パイプに耐火物被徨したうガスを溶鋼表面下５
００關に浸漬させ、不活性ガス（Ａｒ）＋ＯａＯ粉を吹
き込み、溶融スラグと添加ＡＩ！系合会合金鉄強制撹拌
させ、酸化溶融スラグを改質し友。その結果を従来法と
比較して第２図に示す。この後、取鍋底部に装備したポ
ーラスプラグを介して溶鋼表面よりｔｏｏｏａｗ以上の
深さη為らＡｒノ々ブリンダして溶鋼中に侵入し皮膜酸
生成物の除去を実ｆ山シた。Apply the specified deoxidizing agent and ferroalloy to obtain A as shown in Table 1.
/ - K steel is obtained next. A/type associated metal iron was added to the oxidized molten slag above the molten steel after deoxidation and composition adjustment. After this, the gas that had settled on the refractory was poured into the metal pipe under the surface of the molten steel.
It is immersed in 0.00°C, inert gas (Ar) + OaO powder is blown into it, and the molten slag and added AI! It is useful for modifying oxidized molten slag by forced stirring of alloyed iron alloys. The results are shown in FIG. 2 in comparison with the conventional method. Thereafter, an Ar nozzle was used to enter the molten steel from a depth η of more than 100 ft from the surface of the molten steel through a porous plug installed at the bottom of the ladle, thereby effectively removing the coating acid product.
この結果、製品介在物（処理後〜鋳造完了迄°の酸比溶
融スラグと溶鋼中の酸素親和力の強い元素との２次反応
による脱酸生成物、当品橿ではＡＪ？２０３）指数は、
第３図に示すように従来法より極めて向上した。まπ、
温厩低下も従来の約１／２であった。As a result, the index of product inclusions (deoxidation products resulting from the secondary reaction between the acid ratio molten slag and elements with strong oxygen affinity in molten steel from after treatment to the completion of casting; for this product, AJ?203) is
As shown in Fig. 3, this was significantly improved over the conventional method. Mapi,
The temperature drop was also about 1/2 that of the conventional method.
なお、スラグ改質に際し浸漬ランスからＡｒガスのみを
吹込んだ場合についても行なつ几が、殆んどＡｒ＋Ｏａ
Ｏ粉と同等の結果で、ｂつｔｏ特にＯａＯ粉は低塩基度
スラグの場合有効であった。In addition, even when only Ar gas is blown from the immersion lance during slag reforming, most of the gas is Ar+Oa.
The results were similar to those of OaO powder, and OaO powder was particularly effective in the case of low basicity slag.
（発明の効果）
以上述べた如く１本発明にエリ浴鋼上部に存在する酸化
溶融スラグを容易に且つ効率良く改質でき、スラグ改質
の安定化が図られ％溶鋼の汚染を十分に抑制できるとと
もに溶鋼の有価元素の損失をも防止できる。ま几、処理
過程における温度低下が極めて小さく、連鋳工程の負荷
を解消し、高清浄鋼の溶製が簡皐な方法で可能となる。(Effects of the Invention) As described above, according to the present invention, the oxidized molten slag present in the upper part of the bath steel can be easily and efficiently modified, the slag modification is stabilized, and the contamination of the molten steel is sufficiently suppressed. At the same time, loss of valuable elements in the molten steel can be prevented. The temperature drop during the treatment process is extremely small, eliminating the burden of the continuous casting process and making it possible to produce high-clean steel in a simple manner.
第１図はランス浸漬深さと脱酸生成物の溶鋼への侵入ｆ
Ｒことの関係を示す図。
＠２図は本法と従来法に於ける溶鋼上部に存在する溶融
スラグ中Ｔ−１’ｅ量の差異を示す図。
＠３図は本法と従来法に於ける製品介在物指数の差異を
示す図である。
代理人 弁理士 秋 沢 政 光
他１名
第１図
（ｍｍ）
う〕ズ漫ｊ責３尿さくｍＷＬ”）
第２図
才５図
伝 米
津Figure 1 shows the lance immersion depth and the penetration of deoxidation products into molten steel.
A diagram showing the relationship between R. Figure @2 is a diagram showing the difference in the amount of T-1'e in the molten slag present in the upper part of the molten steel between this method and the conventional method. Figure @3 is a diagram showing the difference in product inclusion index between this method and the conventional method. Agent: Patent attorney Masamitsu Akizawa and 1 other person Figure 1 (mm) Uzumanji 3 Urine Collection (mWL) Figure 2 Sai 5 Biography Yonezu
Claims (1)
上面に浮上した酸化溶融スラグの表面に強脱酸剤を添加
し、ランスを溶鋼浴面に対し０〜５００ｍｍの浸漬深さ
にして不活性ガスまたは不活性ガスと生石灰粉を吹込み
スラグ中のＴ、Ｆｅを３％以下とし、次いで該溶融金属
容器の溶鋼表面より１０００ｍｍ以上の深さから不活性
ガスを吹込み前工程の脱酸生成物を浮上除去することを
特徴とする溶鋼の清浄化方法。(1) A strong deoxidizing agent is added to the surface of the oxidized molten slag that floats to the top of the molten steel that has been tapped into the molten metal container after the refining process, and the lance is immersed to a depth of 0 to 500 mm into the molten steel bath surface. Inert gas or inert gas and quicklime powder is injected to reduce T and Fe in the slag to 3% or less, and then inert gas is injected from a depth of 1000 mm or more from the molten steel surface of the molten metal container to remove the previous process. A method for cleaning molten steel characterized by floating and removing acid products.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9539787A JPS63262412A (en) | 1987-04-20 | 1987-04-20 | Method for cleaning molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9539787A JPS63262412A (en) | 1987-04-20 | 1987-04-20 | Method for cleaning molten steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63262412A true JPS63262412A (en) | 1988-10-28 |
Family
ID=14136525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9539787A Pending JPS63262412A (en) | 1987-04-20 | 1987-04-20 | Method for cleaning molten steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63262412A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01294817A (en) * | 1988-05-23 | 1989-11-28 | Kawasaki Steel Corp | Method for cleaning molten metal |
| JPH02250915A (en) * | 1989-03-23 | 1990-10-08 | Kawasaki Steel Corp | Method for producing high clean dead soft steel |
| JPH0356614A (en) * | 1989-07-26 | 1991-03-12 | Kawasaki Steel Corp | Production of low-oxygen dead-soft carbon steel |
| JPH0472009A (en) * | 1990-07-10 | 1992-03-06 | Kawasaki Steel Corp | Method for refining high cleanliness steel |
| JPH0488117A (en) * | 1990-07-31 | 1992-03-23 | Kawasaki Steel Corp | Method for refining dead soft carbon steel |
-
1987
- 1987-04-20 JP JP9539787A patent/JPS63262412A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01294817A (en) * | 1988-05-23 | 1989-11-28 | Kawasaki Steel Corp | Method for cleaning molten metal |
| JPH02250915A (en) * | 1989-03-23 | 1990-10-08 | Kawasaki Steel Corp | Method for producing high clean dead soft steel |
| JPH0356614A (en) * | 1989-07-26 | 1991-03-12 | Kawasaki Steel Corp | Production of low-oxygen dead-soft carbon steel |
| JPH0472009A (en) * | 1990-07-10 | 1992-03-06 | Kawasaki Steel Corp | Method for refining high cleanliness steel |
| JPH0488117A (en) * | 1990-07-31 | 1992-03-23 | Kawasaki Steel Corp | Method for refining dead soft carbon steel |
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