JPH01172508A - Method for purifying molten steel during heating in ladle - Google Patents
Method for purifying molten steel during heating in ladleInfo
- Publication number
- JPH01172508A JPH01172508A JP62331688A JP33168887A JPH01172508A JP H01172508 A JPH01172508 A JP H01172508A JP 62331688 A JP62331688 A JP 62331688A JP 33168887 A JP33168887 A JP 33168887A JP H01172508 A JPH01172508 A JP H01172508A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- steel
- heating
- al2o3
- ladle
- 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 97
- 239000010959 steel Substances 0.000 title claims abstract description 97
- 238000010438 heat treatment Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims description 21
- 239000000956 alloy Substances 0.000 claims abstract description 10
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 10
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 7
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 6
- 229910052790 beryllium Inorganic materials 0.000 claims abstract description 6
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 12
- 229910001882 dioxygen Inorganic materials 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 19
- 229910052593 corundum Inorganic materials 0.000 abstract description 19
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 abstract description 7
- 239000001301 oxygen Substances 0.000 abstract description 7
- 238000007664 blowing Methods 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 4
- 239000000654 additive Substances 0.000 description 14
- 230000000996 additive effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000005587 bubbling Effects 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000007872 degassing Methods 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000009257 reactivity Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910014458 Ca-Si Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- HJUGFYREWKUQJT-UHFFFAOYSA-N tetrabromomethane Chemical compound BrC(Br)(Br)Br HJUGFYREWKUQJT-UHFFFAOYSA-N 0.000 description 2
- 229910004709 CaSi Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004303 calcium sorbate Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000005070 ripening Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
【発明の詳細な説明】 一発明の目的、・ 産業上の利用分野 本発明は取鋼加熱時の溶鋼清浄化法に係り。[Detailed description of the invention] 1. Purpose of the invention: Industrial applications The present invention relates to a method for cleaning molten steel during heating of steel.
詳しくは、八ｌを溶解した溶鋼に酸素ガスを吹込み高温
とした溶鋼に特定の添加剤を添加し、溶鋼中のＡｌ２Ｏ
３介在物を除去又は改質する取鋼ｈｏ熟熱時溶鋼清浄化
法（係る。In detail, specific additives are added to the molten steel that has been heated to a high temperature by blowing oxygen gas into the molten steel.
3. Method for cleaning molten steel during ripening to remove or modify inclusions (relevant).
従 来 の 技 術
近年、転炉帖棟の合印化のため、溶銑の大量迅速処理化
が要求され、そのためには転炉精錬時の熱り荷を軽減す
ることが重要な課題であるが、二次精錬で溶鋼を加熱す
るのが望ましい。Conventional technology In recent years, due to the joint sealing of converter buildings, rapid processing of large quantities of hot metal has been required, and to this end, reducing the heat load during converter refining is an important issue. , it is desirable to heat the molten steel in secondary refining.
二次精練における＠鋼１＋０熱方法とじ−（は、誘導加
熱、ツー９１１口熱、黒鉛電極の抵抗加熱など電気を利
用するのが一般的である。しかし、これらは溶鋼を汚染
寸−ること／イ＜ｌＪ［ｌｐ！ＩＣきる利点はあるｈ（
、その設備′ＶＩＩｆ大きいという欠点がある。In secondary smelting, electricity is generally used, such as induction heating, two-way heating, and resistance heating using graphite electrodes.However, these methods can cause contamination of the molten steel. /I<lJ[lp!There is an advantage to IC h(
However, the disadvantage is that the equipment 'VIIf is large.
また、取鍋内の溶鋼の簡便な加熱ｈ′ｒｋとしＣ溶鋼中
にＡｌを溶融さけ、その溶鋼に酸素ガスを吹付は加熱し
、脱酸処理した後、Ｃａ含有物質に上り清浄化するｂ法
がある（待間昭５７−Ｌ７＋ＧＩＧ弓公報）。このｈ＞
Ａは設備費が安く、簡便に溶＋１４をＩ＋Ｉｌ熱Ｃき、
溶鋼をある程度清浄化することが可能である点Ｃ１工業
的に利用し易いものＣあるが、ＡｌｌとＦｌ！２素ガス
との反応で生成した八１１２０３が溶鋼中に懸濁状態と
なるため、これは脱ガス処理しても完全な除去や改質が
Ｃきず、鋼材の品質を損なう場合があり、品質要求の厳
しい高級鋼の製造には適用することはできない。In addition, it is possible to simply heat the molten steel in a ladle (h'rk) to avoid melting Al in the molten steel, spray oxygen gas onto the molten steel, heat it, deoxidize it, and then remove the Ca-containing substances to clean it. There is a law (Machima Sho 57-L7 + GIG Bow Publication). This h>
A has low equipment costs and can be easily melted + 14 by I + Il heat C.
It is possible to clean molten steel to some extent C1 There are C1s that are easy to use industrially, but All and Fl! Since the 811203 generated by the reaction with the two gases becomes suspended in the molten steel, it cannot be completely removed or reformed even with degassing treatment, which may impair the quality of the steel material. It cannot be applied to the production of high-grade steel, which has strict requirements.
以上型するに、Ｌ記の如〈従来例では転炉の熱負荷を低
減し溶鋼を清浄化する方法として電熱管反応熱を利用す
る方法が提案され−Ｃいるが、重石は高級鋼が得られる
が設備費は大ぎく、後者は簡便む加熱方法であるが、こ
の方法を実施しても十分に清浄化された高級鋼は得られ
ない。In summary, as shown in L. In the conventional example, a method has been proposed that uses the heat of reaction of electric heating tubes as a method of reducing the heat load of the converter and cleaning the molten steel. Although the latter method is a simple heating method, sufficiently cleaned high-grade steel cannot be obtained even if this method is implemented.
また、このような簡便な加熱方法による研究量定が４−
分１１なわれＣいない。In addition, research quantitative determination using such a simple heating method is
Minute 11 Naware C isn't there.
発明が解決しようとする問題点
本発明はこれらの欠点の解決を目的とし、具体的には、
＾ｌを溶解した溶鋼に酸素ガスを吹付は溶鋼を加熱する
際に、生成するＡｔ２０３は溶鋼中におい（懸濁状態で
あるため、これをηいに合体し合う化学組成の介在物の
形態とし、最終的に介在物の除去あるいは無害な介イｆ
物とする口とがむづかしいこと、更に、このような酸素
ガスを用いる簡易加熱法による高級鋼の製造技術が未だ
十分に研究開発されていないこと等の問題を解決するこ
とを目的とする。Problems to be Solved by the Invention The present invention aims to solve these drawbacks, and specifically,
When oxygen gas is sprayed onto molten steel containing molten At203, the generated At203 is present in the molten steel (because it is in a suspended state, it is in the form of inclusions with different chemical compositions that coalesce into each other). , finally removal of inclusions or harmless intervention f
The purpose of the present invention is to solve problems such as the difficulty of manufacturing high-grade steel, and the fact that the manufacturing technology of high-grade steel by a simple heating method using oxygen gas has not yet been sufficiently researched and developed.
′発明の構成〕・
問題点を解決するための
手段ならひにその作用
すなわち、本発明は、取鍋内の八ｌを溶解した溶鋼に酸
素ガスを吹付は溶鋼を加熱する際に、１ｊ口熱時あるい
はＩＩ口熟熱後温度が１５９０Ｃ以１−の溶鋼に対し、
Ｃ１１，Ｃｅ、 Ｂｅ、Ｌａの元素から選ばれた１種又
は２種以［の単体若しくはこれらを含有する合金を前記
元素成分の純分合計量で０，５〜１．０ｋＩＪ 、’
ｔの割合で添１＋１１１．、：どの添加中及び／又は添
加後、攪拌を行％い、溶鋼中のＡｌ２Ｏ３介在物を除去
又は改″ｆｉすることを特徴とする。``Structure of the Invention'' - If it is a means to solve the problem, the present invention provides a method for spraying oxygen gas onto 8 liters of molten steel in a ladle when heating the molten steel. For molten steel with a temperature of 1590C or higher during heating or after heating,
One or more elements selected from the elements C11, Ce, Be, and La, or an alloy containing them, in a total amount of 0.5 to 1.0 kIJ in pure content of the above elemental components.
At the rate of t, add 1 + 111. .: During and/or after each addition, stirring is performed to remove or modify Al2O3 inclusions in the molten steel.
そこＣ１これらの手段たる構成ならＯにその作用につい
Ｃ更に具体的に説明すると、次の通りＣある。Therefore, if C1 is the configuration of these means, then C is the function of C. To explain more specifically, C is as follows.
本発明者等は前記問題点を解決するため、いろいろ研究
した結果、ＡＩを溶解した溶鋼に酸素ガスを吹付け、温
度を高めた溶鋼にＣａ、Ｃａ−３ｉ合金等の特定の添加
物を添加すると、その反応性が高められ、溶鋼中のＡｌ
２Ｏ，が互いに良く合体し、肥大するという知見を得、
本発明はこの研究に基づいＣ成立したものである。In order to solve the above-mentioned problems, the present inventors conducted various studies and found that they sprayed oxygen gas onto molten steel containing AI, and added specific additives such as Ca and Ca-3i alloy to the heated molten steel. As a result, its reactivity is increased, and Al in the molten steel is
Obtained the knowledge that 2O, coalesces well with each other and becomes enlarged,
The present invention was established based on this research.
本発明者等は待間昭５７−＋７１ＧＩＧ号公報記載の如
＜、Ａｌと酸素ガスにより脱炭精錬１春の溶鋼に対し脱
酸処理し全酸素量を低下さけた後、Ｃａ含イ］物貿を溶
鋼ｌ当りＣａ串０．５ｋｌｌ以下の割合で溶鋼に’ｆＡ
ＩＪＩＭる方法について検討したところ、この方法に
よれば、溶鋼中の全酸素量を低下させる際、温度が低下
し所望の高級鋼が得られない口とがり・）た。クーなわ
ら、この方法によっ−（Ａ！’？られた鋼材中には、数
＋ｕ１１〜数百μｍの粒径のＡｔ！２０３を主成分とす
る介在物が鋼中に残存し、品質劣化を引き起し゛（いる
ためである。これらは製品加工中に変形せず、鋼に割れ
を発生させｊｌ＝常に有害であり、高級鋼とするには除
去すべきしのである。これらが脱ガス処理後も溶鋼中に
存イｔするのは通゛常では考えにくい事ではあるが、現
実には、脱ガス処理しても未だ溶鋼中に残（ｒ （、’
ＣいるのＣあるっ口れは主成分とするＡｌ２Ｏ３の純度
が高いため、溶鋼のなかで懸濁状態にあつＣ，ηいに凝
集肥大しにくく、溶鋼から除去されにくく、結果としく
溶鋼中に残７ｆするものと考えられろう
このよう／１Ａ１２０３を主成分とする介在物を残存さ
ｌ！ないようにするには、溶鋼中に生成したＡｔ２０３
を改質して低融白なものに形態制御し、それをガスバブ
リング等により攪拌し、）疑集肥大させ、浮ト除去−ｑ
るように寸ればよいが、溶鋼中に生成したＡｌ２Ｏ３を
改Ｖ′Ｊ！Ｊ−ることが田ガで、これを凝集肥大化させ
浮ト除去することはむつかしい。As described in Machima Sho 57-+71 GIG Publication, the present inventors deoxidized molten steel that had been decarburized with Al and oxygen gas to avoid reducing the total oxygen content, Add 'fA to molten steel at a rate of less than 0.5kll of Ca per liter of molten steel.
When we investigated the IJIM method, we found that when lowering the total amount of oxygen in molten steel, the temperature dropped and the desired high-grade steel could not be obtained. However, in the steel material treated by this method, inclusions whose main component is At!203 with a particle size of several μm to several hundred μm remain in the steel, resulting in quality deterioration. This is because they do not deform during product processing and cause cracks in the steel, which is always harmful and must be removed to make high-grade steel. Although it is usually difficult to imagine that it remains in molten steel even after treatment, in reality, it still remains in molten steel even after degassing treatment.
Because the purity of Al2O3, which is the main component of C, is high, C, which is suspended in the molten steel, is difficult to agglomerate and thicken and is difficult to remove from the molten steel. It is thought that inclusions mainly composed of /1A1203 are left behind. In order to prevent At203 generated in molten steel,
Modify it to control its shape to a low-melting one, stir it by gas bubbling, etc., make it thicken, and remove floating particles -q
However, if the Al2O3 generated in the molten steel is reduced to It is difficult to remove floating particles because they aggregate and enlarge.
従来、Ａｌ２Ｏ３を主成分とする介在物の形態制御とし
Ｃｃａｏ系フラックスをフラックスインジエクシ」ンが
多く用いられてきた。この場合には、八１！！２０３と
ＣａＯが低融点の組成にそろえることが回動でＡｊ？２
０３甲休あるいはＣａＯ甲体、更には両名同時に存在す
ることさえもあり、高級鋼に対しこは用いられないっ
また、持間昭５７− ＋７＋Ｇ＋Ｇ号公報記載の如く、
脱Ｍｊりに生成づるＡｌ２Ｏ３除去のため、全酸素；關
度を低下させたのち、０．５にりパ【以下のＣａ、Ｃａ
−Ｓｉ合金と添加するｂ法ＣはＭ、拳処理に先立ち、溶
鋼にバブリング＠Ｉｉ費真空脱ガス処理して酸素潤度を
低下させねばならず、温度低下や設備ｌ）（大きくなる
等実用的Ｃなく、一方、ｏ、５ｋｇ／を以上のＣａ、
Ｃａ−３ｉ含金の添加は溶鋼中に残存し、有害な＋１イ
［物となる。Conventionally, flux injecting with Ccao-based flux has been widely used to control the morphology of inclusions containing Al2O3 as a main component. In this case, 81! ! 203 and CaO have a low melting point composition due to rotation Aj? 2
03 Koki or CaO Kai, and even both may exist at the same time, and this is not used for high-grade steel.
In order to remove Al2O3 produced during de-Mj removal, after reducing the total oxygen concentration, the following Ca, Ca
-Method B, which is added to Si alloy, requires Bubbling @ Ii cost vacuum degassing treatment to lower the oxygen moisture content of the molten steel prior to fist treatment, lowering the temperature and increasing the size of the equipment, etc. On the other hand, o, more than 5 kg/Ca,
The addition of Ca-3i metal remains in the molten steel and becomes a harmful +1I substance.
そこで、本発明ＣはＣａ ＳｉなどのようにＣａを含
有する合金を酸素ガス吹精しながらあるいは酸素ガス吹
ｆｉ總了後の１５９０℃以上の温度の溶鋼に添加し、以
ｊ＠溶鋼を攪拌覆ると、／ｌ−作物は凝集肥大し、浮上
分１１１１ ｄるようにしたものである。Therefore, in the present invention C, an alloy containing Ca such as CaSi is added to molten steel at a temperature of 1590°C or higher while blowing with oxygen gas or after completion of blowing with oxygen gas, and then stirring the molten steel. When covered, the /l-crop became cohesive and thickened, with a floating fraction of 1111 d.
本発明におい−Ｃは溶鋼温度を１５９０’Ｃ以十とすれ
ば、鋼中のＡｌ２Ｏ３と添加したＣａ、 Ｃａ−Ｓｉ合
Φは反応性が高まり、互いに良く合体肥大することがで
＠、Ｃａ、 Ｃａ−Ｓｉ合金の添加量を０．５ｋｌＪ＋
′１以上とじでも有害な介在物とはならないようにした
しのＣある。この理由は、Ａｌを用いて酸素Ｃ譬熱号−
る場合、生成するＡｌ１２０３が多いため、０．５ｋｇ
、’１以下のＣａ、 Ｃａ−３ｉ添加吊では八４２０３
の除去率が低く、高扱鋼は臂られ’ｔＬいがらである。In the present invention, when the molten steel temperature is 1590'C or higher, the reactivity of Ca, Ca-Si combination Φ with Al2O3 in the steel increases, and they coalesce well with each other and enlarge. Addition amount of Ca-Si alloy is 0.5klJ+
There is a part C that prevents the formation of harmful inclusions even if the paper is bound for more than 1 hour. The reason for this is that when Al is used,
0.5 kg due to the large amount of Al1203 produced.
, 84203 with Ca of 1 or less, Ca-3i addition
The removal rate of steel is low, and high-performance steel is left in the lurch.
通常、溶鋼中のＡＸと酸素ガスを反応させ、その反応熱
を利用して溶鋼を昇熱する揚台、溶鋼中ニｔ、を通ｔｆ
； １００〜２００Ｈｍ稈度の八１２０３が介イ１物と
して取込まれる。この印は溶鋼を１０〜５０′Ｃ昇熱“
りる場合には１Ｊは一定であり、昇熱に使用される酸素
品には依存しない。この事実は大部分のＡｌ２Ｏ３は溶
鋼外へ除去されるが、１００〜２００ｐｐｍの吊になる
と、凝集肥大するｉ率が低下−俳ることによるしのとｖ
Ｆｌ釈される。１００〜２００ｐｐｍのＡｌ２Ｏ３を改
質するために、ＣａＯ等のフラックスをインジェクショ
ン４゛るのは反応性、吊の調整ｊｆ’Ｂかしく実用的Ｃ
イイい。そこで、Ｃａ、 Ｃｅ、 Ｂｅ、しａの元素か
ら選ばれた単体又はこれらを含む合金からへる添加剤と
Ａｌ２Ｏ３と即座に陵応し、Ａｌ２Ｏ３を改質するもの
を溶鋼中に添ｌｌ０−Ｊるのが望ましい。また、ト記雁
加剤はＡｌ２Ｏ３と反応しない残金のものは溶鋼中に残
留しにくく鋼材の品質を劣化させない利点もある。Normally, AX in molten steel is reacted with oxygen gas, and the molten steel is heated through a lifting platform that uses the reaction heat to raise the temperature of the molten steel.
; 81203 with a culm of 100-200 Hm is taken in as a grain. This mark indicates "heating the molten steel by 10 to 50'C"
1J is constant and does not depend on the oxygen used for heating. This fact indicates that most of Al2O3 is removed to the outside of the molten steel, but at a concentration of 100 to 200 ppm, the rate of agglomeration and thickening decreases.
Fl is interpreted. In order to modify 100 to 200 ppm of Al2O3, injection of flux such as CaO is an interesting and practical method for adjusting reactivity and suspension.
Good. Therefore, additives made from elements selected from the elements Ca, Ce, Be, and Al or from alloys containing them are added to molten steel to immediately react with Al2O3 and modify Al2O3. It is desirable to In addition, the residual additive that does not react with Al2O3 has the advantage that it is difficult to remain in the molten steel and does not deteriorate the quality of the steel material.
次に、添加剤の添加量について説明する。Next, the amount of additive added will be explained.
第１図は溶鋼温度を変えＣＣａを添加した揚台、その添
１１０吊とＡＪ２０３の除去率との関係を示すグラフで
あり、溶ｍ温度が高い稈、Ｃ１′ｌ添加吊に２４するＡ
ｌ１２０３の除去率が高い口とが示されている。従っＣ
，Ａｌ２Ｏ３を改質するのに必要ξＧａ串（ＣＢｒ４）
％分Ｃ言う）は第１図に示すように溶鋼に対し０．５に
り、′ｌ以上好ましくは０．７ｋｌ；１．’を以ＦＣあ
る。０．５にり／［未満Ｃ（まＡｌ２Ｏ３の改質が不＋
９である、Ｃａ添１＋０串の増加と共にＡｌ２Ｏ３の改
７１効甲ｈ（向トし、Ａｌ２Ｏ３の除去率が増加する。Figure 1 is a graph showing the relationship between the removal rate of AJ203 and the removal rate of AJ203 for lifting platforms with different molten steel temperatures and the addition of CCa.
A high removal rate of l1203 is shown. Follow C
, ξGa skewer (CBr4) required to modify Al2O3
% C) is 0.5 for molten steel as shown in Figure 1, preferably 0.7kl or more; 1. There is a FC after '. 0.5 N/[Less than C (well, the modification of Al2O3 is not +
9, as the Ca-added 1+0 skewer increases, the effect of Al2O3 changes to 71, and the removal rate of Al2O3 increases.
しかし、その添加量が１に９１′ｔを越えるＣａ添加に
よっｃｌ：１Ａ１２０３の除去率は頭打ちとなる０４ｋ
、第１図から明らかなように、添加剤の添ｊｊ日時の溶
鋼；品度の効果も人きく 、 １５９０℃以上の温度で
はＡｌ２Ｏ３除去率が高いが、１５９０’Ｃ未騙ＣはＡ
ｌ２Ｏ３除去率ｈＣ大幅に低下してしまい天川に適さな
い。However, the removal rate of cl:1A1203 reaches a ceiling due to the addition of Ca exceeding 1/91't.04k
, As is clear from Figure 1, the effect of the quality of molten steel on the date and time of addition of additives is also noticeable.At temperatures above 1590°C, the Al2O3 removal rate is high, but at 1590'C, A
The l2O3 removal rate hC is significantly lowered, making it unsuitable for Amakawa.
４、た、１にり／［を越える添ｊ）口は経済的にも成＼
″ｌしにくい。−すなわち、溶鋼のＷ熱効宋以［にＣａ
添１＋０のｔ゛メリツＩが大きくなるのである。これら
のことがら本発明におけるＣａの添加材はその純分Ｃ０
１５〜１．Ｏｋｑ、’ｔの範囲に制限されるっ以上添加
剤としくＣａを含むしのを例に説明したが、Ｃａを含む
もの以外のＧｅ、８ｅ、しａの元素から選ばれた１種又
は２杆以十の単体又は己れら元素を含む合金からなる添
加剤においＣ′ｆＪＣａと同様の挙動をとるので、Ｃａ
と同様に使用Ｃき、その使用適正範囲も変らない。4, 1, 1/[exceeding]
- That is, the W thermal effect of molten steel was
The tmerits I of the addition 1+0 increases. Based on these points, the Ca additive in the present invention has a pure content of C0.
15-1. The additive is limited to the range of Okq,'t.Although we have explained using the additive containing Ca as an example, one or two elements selected from the elements Ge, 8e, and a, other than those containing Ca. Ca
It can be used in the same way as C, and its appropriate range of use remains the same.
また、前記合金としＣは、これら元素の相ηの合金（例
えば市販のミツシュメタル等）の他、これら元素のうち
１種又は２種以上のものを、他のｙｒ：、 ｍ Ｉ例え
ばＦｅ、 Ｓｉ、Ｍ＋＋等）との合金が金集れる。史に
、これらの添加剤の添加に際しＣは、溶鋼中への添１１
０が必要であつ−Ｃ、インジエクション、ワイヤー、フ
ープ等の方法による添１ノロ等が好適に使用Ｃきる。In addition, the alloy C is an alloy of these elements in the phase η (for example, commercially available Mitshu metal, etc.), as well as one or more of these elements, such as other yr:, m I, such as Fe, Si. , M++, etc.) are profitable. Historically, when adding these additives, C was added to molten steel.
0 is required, and -C, addition by injection, wire, hoop, etc. can be suitably used.
・ 次に、攪拌につい（説明すると、前記添加剤を添加
後、溶鋼を攪拌する口とが必要である。・Next, regarding stirring (to explain, it is necessary to have a port for stirring the molten steel after adding the above-mentioned additives.
溶精の＠ＩＹ／ｆない場合には添加した添加剤はへｔ２
０３以外のもの、例えば、１ヘツブスラグなどと反応し
てしまい、Ａ（２０３の除去率が攪拌した場合の？ｒ分
以下となり、効率が著しく悪化する。本発明においＣは
、それ故、添加剤の添加時あるいは添加後の攪拌は必須
条件である。If there is no @IY/f of melting, the additive added is t2
The removal rate of A (203 is less than ?r minutes when stirring is achieved, resulting in a marked deterioration of efficiency. Therefore, in the present invention, C is an additive. Stirring during or after the addition of is an essential condition.
実施例 以下、実施例によって更に説明する。Example This will be further explained below with reference to Examples.
実施例１゜
溶鋼中のＡｌと酸素ガスにより２０ ’Ｃ昇熱し＋００
０’Ｃとした溶鋼媛組成Ｃ，’０．０８％、Ｓｉ、’０
．０１％、Ｉｈ、’０．４５％、残余は鉄１２００【に
Ａｒバブリングで攪ｆｆ シ’：ｔがら総量１２０ｋｇ
＋Ｃａ１４分Ｃ換０１蓼）のＣａをフープにて添加した
。以後通常のバブリング処理を行りつ−Ｃ連続鋳造にて
スラブを製造し、加工しＣ電縫管とした。製品の超音波
試験の結果は良好Ｃあった。Example 1゜Heating was increased by 20'C with Al and oxygen gas in molten steel to +00
Molten steel composition C, '0.08%, Si, '0
．． 01%, Ih, 0.45%, the remainder is iron 1200% and stirred with Ar bubblingff: total amount of 120kg
+Ca 14 minutes C exchange 01) was added using a hoop. Thereafter, a normal bubbling treatment was carried out, and a slab was manufactured by C continuous casting and processed into a C electric resistance welded tube. The result of the ultrasonic test of the product was Good C.
実施例２゜
実施例１と同じ鋼種の溶鋼２０旧を同様の手法（：５０
’（’、昇熱しｌＧ２０′Ｇとした後、総８１５０ｋｇ
＋ｃａ純分（： ｌｔｉ ｉ 後１のＣａをインジエ
クションにて添ＩＩＩした。添加終了後、Ａｒバブリン
グにＣ溶鋼を攪拌し、連続鋳造したつ実施例１と同様に
製品の超音波試験を行なったＦ！５宋、良好な成績Ｃあ
った。Example 2゜ Molten steel 20 years old of the same steel type as Example 1 was prepared using the same method (:50
'(', after heating to lG20'G, total 8150kg
+ Ca pure content (: lti i After addition of 1 Ca by injection, the C molten steel was stirred in Ar bubbling and continuously cast, and the product was subjected to an ultrasonic test in the same manner as in Example 1. I did F!5 Song and had a good grade of C.
比較例。Comparative example.
実施例１と同じ鋼種の溶！１４２００１を同様の手法Ｃ
２０’Ｃ昇熱し１６００′Ｃとした後、ＲＨ脱ガス処理
をし、連続鋳造した。実施例１と同様に製品の超音波試
験を行なったｌｉ！ｉ果、欠陥が発見された。Melting of the same steel type as Example 1! 142001 using similar method C
After raising the temperature by 20'C to 1600'C, RH degassing treatment was performed and continuous casting was performed. The product was subjected to an ultrasonic test in the same manner as in Example 1. As a result, a defect was discovered.
その欠陥部かを切り出し調査したところ、へＥ２０３介
在物が見つかった。When the defective part was cut out and investigated, E203 inclusions were found.
第１表に本発明の実施例により製造した製品と比較例に
示した方法により製；６し１：ｖ品との迫青波試験帖宋
をまとめて承り。第１表から本発明の効果はＪぐれ−Ｃ
いることは明らかである。Table 1 shows products manufactured according to the embodiments of the present invention and comparative examples manufactured according to the methods shown in Table 1. From Table 1, the effect of the present invention is Jgure-C
It is clear that there are.
第 １ 表
・発明の効果〉
以上説明した通り、本発明は取鍋内のＡ／を溶解した溶
鋼に酸本ガスを吹付は溶鋼を加熱する際に、加熱時ある
いは加熱後の湯度ｔｆ１５９０’Ｃ以上の溶鋼に対し、
Ｃａ、 Ｃｅ、 Ｂｅ、Ｌａの元素から選ばれた１４−
ＩＩ又は２種以にの単体若しくはこれらを含有する合金
を前記元素成分の純分合δ１串で０．５〜１．０ｋｌＪ
、ｔの割合で添加し、その添加中及び、゛又は添加１１
！攪拌を行ない、溶鋼中のＡ／２０３介在物を除去又は
改質することを特徴とする取鋼加熱時の溶鋼清浄化法で
ある。Table 1: Effects of the Invention> As explained above, the present invention is capable of spraying acidic gas to molten steel containing A/ in a ladle, and when heating the molten steel, the hot water temperature tf 1590' during or after heating is applied. For molten steel of C or higher,
14- selected from the elements Ca, Ce, Be, and La
II or two or more elements or an alloy containing them at a pure proportion δ1 of the above elemental components from 0.5 to 1.0 klJ
, t, during the addition and, or addition 11
! This is a method for cleaning molten steel during heating of steel, which is characterized by removing or modifying A/203 inclusions in molten steel by stirring.
従って、従来使用された溶鋼の；ｎ度より高い：晶度の
溶鋼に特定の添ｌｊ口剤を特定串添Ｊ＋０陽１丁するこ
とにより、溶鋼中の懸濁状態のＡｇ２Ｏ３を凝東肥人化
させ、除去又は改質させることができ、１ｈ別の設備を
設けることなく簡単／、−Ｃ操作で効率よく高級鋼が得
られる。Therefore, by adding a specific additive to molten steel with a crystallinity higher than the nth degree of the conventionally used molten steel, Ag2O3 in a suspended state in the molten steel can be reduced. high-grade steel can be obtained efficiently by a simple / -C operation without the need for additional equipment.
第１図は本発明の一つの実施例のＣａ添１）１墨と溶鋼
中のＡ／２０３除人寧との関係を示すグラフＣある。
持ａＴ出翰人 川崎製鉄株式会７１
代 理 人 弁叩十 松 下 Ｒ勝弁護士
副 島 文 雄FIG. 1 is a graph C showing the relationship between Ca addition 1) 1 ink and A/203 removal in molten steel in one embodiment of the present invention. Attendee: Kawasaki Steel Co., Ltd. 71 Attorney: Ju Bentaki Matsushita R. Attorney Vice: Fumiyu Shima
Claims (1)
を加熱する際に、加熱時あるいは加熱後の温度が１５９
０℃以上の溶鋼に対し、Ｃａ、Ｃｅ、Ｂｅ、Ｌａの元素
から選ばれた１種又は２種以上の単体若しくはこれらを
含有する合金を前記元素成分の純分合計量で０．５〜１
．０ｋｇ／ｔの割合で添加し、その添加中及び／又は添
加後、攪拌を行ない、溶鋼中のＡｌ＿２Ｏ＿３介在物を
除去又は改質することを特徴とする取鍋加熱時の溶鋼清
浄化法。When heating the molten steel by spraying oxygen gas onto the molten steel containing melted Al in the ladle, the temperature during or after heating is 159
For molten steel at 0°C or higher, one or more elements selected from Ca, Ce, Be, and La, or an alloy containing them, is added in a total amount of 0.5 to 1 in pure content of the above elemental components.
．． A method for cleaning molten steel during heating of a ladle, characterized by adding at a rate of 0 kg/t and stirring during and/or after the addition to remove or modify Al_2O_3 inclusions in the molten steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62331688A JPH01172508A (en) | 1987-12-25 | 1987-12-25 | Method for purifying molten steel during heating in ladle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62331688A JPH01172508A (en) | 1987-12-25 | 1987-12-25 | Method for purifying molten steel during heating in ladle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01172508A true JPH01172508A (en) | 1989-07-07 |
Family
ID=18246468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62331688A Pending JPH01172508A (en) | 1987-12-25 | 1987-12-25 | Method for purifying molten steel during heating in ladle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01172508A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5348567A (en) * | 1992-11-17 | 1994-09-20 | Clyde Shaw Limited | Decontamination method |
| WO2003002771A1 (en) * | 2001-06-28 | 2003-01-09 | Nippon Steel Corporation | Low carbon steel sheet, low carbon steel cast piece and method for production thereof |
-
1987
- 1987-12-25 JP JP62331688A patent/JPH01172508A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5348567A (en) * | 1992-11-17 | 1994-09-20 | Clyde Shaw Limited | Decontamination method |
| WO2003002771A1 (en) * | 2001-06-28 | 2003-01-09 | Nippon Steel Corporation | Low carbon steel sheet, low carbon steel cast piece and method for production thereof |
| JPWO2003002771A1 (en) * | 2001-06-28 | 2004-10-21 | 新日本製鐵株式会社 | Low carbon steel sheet, low carbon steel slab, and method for producing the same |
| AU2002313307B2 (en) * | 2001-06-28 | 2005-08-11 | Nippon Steel Corporation | Low carbon steel sheet, low carbon steel cast piece and method for production thereof |
| US7347904B2 (en) | 2001-06-28 | 2008-03-25 | Nippon Steel Corporation | Low carbon steel sheet and low carbon steel slab and process for producing same |
| US8048197B2 (en) | 2001-06-28 | 2011-11-01 | Nippon Steel Corporation | Low carbon steel sheet and low carbon steel slab and process for producing same |
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