JPH0347910A - Method for deoxidizing molten steel - Google Patents
Method for deoxidizing molten steelInfo
- Publication number
- JPH0347910A JPH0347910A JP18046689A JP18046689A JPH0347910A JP H0347910 A JPH0347910 A JP H0347910A JP 18046689 A JP18046689 A JP 18046689A JP 18046689 A JP18046689 A JP 18046689A JP H0347910 A JPH0347910 A JP H0347910A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- cao
- deoxidizing
- deoxidation
- added
- 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 41
- 239000010959 steel Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000000203 mixture Substances 0.000 claims abstract description 24
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 230000007547 defect Effects 0.000 abstract description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052593 corundum Inorganic materials 0.000 abstract description 7
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract description 7
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 abstract 1
- 229910001634 calcium fluoride Inorganic materials 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 229910000655 Killed steel Inorganic materials 0.000 description 4
- 238000005266 casting Methods 0.000 description 4
- 238000005188 flotation Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000011179 visual inspection Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 230000005587 bubbling Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000011261 inert gas Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- BYFGZMCJNACEKR-UHFFFAOYSA-N aluminium(i) oxide Chemical compound [Al]O[Al] BYFGZMCJNACEKR-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000004484 Briquette Substances 0.000 description 1
- 229910052770 Uranium Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 235000019402 calcium peroxide Nutrition 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は溶鋼の脱酸方法に関するものである。[Detailed description of the invention] (Industrial application field) The present invention relates to a method for deoxidizing molten steel.
（従来の技術）
溶鋼の脱酸方法としてアルミニウムキルド鋼と称する鋼
の場合、製鋼工程において一般的には未脱酸溶鋼の中に
純Ｍを添加して脱酸している。(Prior Art) As a method for deoxidizing molten steel, in the case of steel called aluminum killed steel, pure M is generally added to undeoxidized molten steel to deoxidize it in the steel manufacturing process.
この脱酸方法であると脱酸生成物としてＡ７２０゜系の
酸化物が大量に発生する。この溶鋼内にミクロに懸濁分
散したＭ２Ｏ３はその後、モールド内又はモールドに至
るまでの間に凝集しＡ１２０３クラスターとなって鋳造
時鋳片に捕捉されると「スリバー」と称する表面疵とな
ったり、「ふくれ状欠陥」や「ブローホール」と称する
内部欠陥となって著しく鋼材の品質を悪化することが一
般によく知られている。このため通常脱酸以降の処理工
程でＮ２Ｏ３を浮上分離させ溶鋼と分離し、鋼材の欠陥
を減少させる方法が一般に行われている。This deoxidation method generates a large amount of A720° series oxides as deoxidation products. The M2O3 microscopically suspended and dispersed in this molten steel then aggregates in the mold or before reaching the mold, forming A1203 clusters, and when captured in the slab during casting, it becomes a surface flaw called "sliver". It is generally well known that internal defects called "bulge-like defects" and "blowholes" occur, which significantly deteriorate the quality of steel materials. For this reason, a method is generally used in which N2O3 is floated and separated from the molten steel in a treatment step after deoxidation to reduce defects in the steel material.
例えば、ａ）ＩＶ脱酸後の溶鋼を撹拌、バブリング等し
てＮ ｚ Ｏ３を凝集合体して浮上を促進する方法。For example, a) a method of stirring, bubbling, etc. the molten steel after IV deoxidation to agglomerate and coalesce N z O3 to promote floating.
ｂ）タンデイツシュの中に堰を設けてＮ ｚ Ｏ３の浮
上を促進する方法（特開昭６０−１１４５１３号公報）
、Ｃ）モールド内でのＡｒガスの吹き込みによるＮ２Ｏ
３の浮上分離の促進方法（特開昭５９−６３１３号公報
）等が知られている。b) Method of promoting floating of N z O3 by providing a weir in the tandem tube (Japanese Patent Application Laid-open No. 114513/1983)
, C) N2O by blowing Ar gas inside the mold
Method 3 of promoting flotation separation (Japanese Unexamined Patent Publication No. 59-6313) is known.
（発明が解決しようとする課題）
従来行われている純Ｍ添加による脱酸方法では脱酸生成
物であるＮｚ（ｈが大量に発生しその後の浮上分離アク
ションを実施しても十分でなく現状の脱酸方法、浮上分
離対策では鋼材の欠陥となるＡ／ ｚ Ｏ３を皆無にす
るには至っていない。このため前述の７Ｖ２０３浮上分
離対策を実施した場合でも、ｌＶ２Ｏ３に起因する欠陥
がある程度発生しその根絶対策はまだ実施されていない
のが現状である。(Problem to be solved by the invention) In the conventional deoxidation method by adding pure M, a large amount of Nz(h), which is a deoxidation product, is generated, and the subsequent flotation separation action is not sufficient. Deoxidization methods and flotation measures have not completely eliminated A/z O3, which causes defects in steel materials.For this reason, even if the aforementioned 7V203 flotation measures are implemented, defects due to lV2O3 will still occur to some extent. At present, measures to eradicate the disease have not yet been implemented.
（課題を解決するための手段）
本発明の要旨とするところは未脱酸の溶鋼中へ金属アル
ミニウム、ＣａＯ又は金属アルミニウム、Ｃａｂ、 Ｃ
ａＦ２の結合体又は、混合体を添加し、生成する介在物
をＣａｂ−Ａ７ｚＱ、、系組成とさせて脱酸することを
特徴とする溶鋼の脱酸方法にある。(Means for Solving the Problems) The gist of the present invention is to add metal aluminum, CaO, or metal aluminum, Cab, C into undeoxidized molten steel.
A method for deoxidizing molten steel characterized by adding a combination or a mixture of aF2 and deoxidizing the generated inclusions to have a Cab-A7zQ system composition.
すなわち本発明は溶鋼を脱酸する際、従来と同じように
Ｍを用いて脱酸するものであるが、Ｍを単独に添加する
ものではなくＭとＣａＯ又は、ＭＣａｂ、 ＣａＦｚを
結合体、又は混合体として同時に溶鋼へ添加するように
したものである。That is, in the present invention, when deoxidizing molten steel, M is used to deoxidize as in the conventional method, but instead of adding M alone, a combination of M and CaO, MCab, CaFz, or It is added as a mixture to molten steel at the same time.
Ｍの添加によって溶鋼中で生成するＮ２Ｏ３は極めて小
さく個々の大きさは数ミクロンなので溶鋼との比重差に
よる自浮力が殆どなく、このため溶鋼中に懸濁分散した
状態となっている。The N2O3 generated in the molten steel by the addition of M is extremely small, with individual sizes of several microns, so it has almost no self-buoyancy due to the difference in specific gravity with the molten steel, and is therefore suspended and dispersed in the molten steel.
この溶鋼中に懸濁分散しているミクロなＡｌ２Ｏ３を浮
上分離させるために前述の種々の対策（バブリング、溶
鋼撹拌、タンデイツシュの堰、 Ａｒ気泡吹込み等）が
実施されているがこれら浮上分離促進型の対策だけでは
溶鋼中に懸濁したＭ、０３を完全に分離するには到って
いない。In order to float and separate the microscopic Al2O3 suspended and dispersed in this molten steel, the various measures mentioned above (bubbling, stirring of molten steel, tandem weir, Ar bubble injection, etc.) have been implemented. Mold countermeasures alone have not been able to completely separate M and 03 suspended in molten steel.
このＡｌ２Ｏ３はタンデイツシュ下部に設置される鋳型
に溶鋼を供給する浸漬ノズル周辺の流量制御機構に付着
して流量制御のバラツキを誘発したり、付着して塊状と
なって欠落し欠陥となったり又、液相と固相の共存する
モールド内の不安定な温度条件と複雑な溶鋼流動の中で
凝集し大型のクラスクーとなりその一部が鋳片に捕捉さ
れると表面疵となったり内部欠陥となることが一般によ
く知られている。This Al2O3 may adhere to the flow rate control mechanism around the immersion nozzle that supplies molten steel to the mold installed at the bottom of the tundish, causing variations in flow rate control, or may adhere to it and become lumps, causing defects. Under the unstable temperature conditions in the mold where liquid and solid phases coexist and the complex flow of molten steel, it aggregates and forms large cracks, some of which become trapped in the slab, resulting in surface flaws or internal defects. This is generally well known.
本発明はこのミクロ懸濁しているＡｌ２Ｏ３を脱酸と同
時にＭとの結合体、混合体をなすＣａＯによりＣａＯ−
／ＶｚＯｚとせしめることにより表面疵や内部欠陥部に
検出される有害なＡ７２０３系介在物とは異なる無害な
形に形態を制御し鋳造工程で付着欠落や凝集捕捉を発生
させない脱酸方法を特徴とするものである。In the present invention, this micro-suspended Al2O3 is deoxidized and at the same time CaO-
/VzOz to control the morphology to a harmless form different from the harmful A7203 inclusions detected in surface flaws and internal defects, and is characterized by a deoxidizing method that does not cause adhesion failure or agglomeration trapping during the casting process. It is something to do.
即ち、Ｍを単独で添加すればＭは溶鋼中の酸素と反応し
大量のＡｌ２Ｏ３を溶鋼中に懸濁させるが、ＣａＯとの
結合体、混合体での添加により生成する脱酸化成物はそ
の組成を同時に添加されたＣａＯによりＣａ０−ｕｚ０
３となり溶鋼中に懸濁してい＜ｊＶｚｏ：＋の発生を防
止できる。That is, if M is added alone, M reacts with oxygen in the molten steel and suspends a large amount of Al2O3 in the molten steel, but the deoxidizing products produced by adding it in combination with CaO or as a mixture Ca0-uz0 due to CaO added at the same time
3, which can prevent the occurrence of <jVzo:+ suspended in the molten steel.
このように形態がＣａ０−ｊＶｚ０３化した介在物は取
鍋での精錬工程でも合体肥大しやすいため自浮力を持ち
浮上分離しやすく、且、鋳造工程でもタンデイツシュ等
を通過中に浮上分離していく。Inclusions with a form of Ca0-jVz03 are likely to coalesce and enlarge during the refining process in a ladle, so they have self-buoyancy and are easy to float and separate.In addition, during the casting process, they float and separate while passing through the tundish etc. .
このためモールドまで流出してくるＣａ０−ｋｌｚ０３
は極めて小さいもののみが流出するが、モールド内で浮
上できず鋳片に捕捉される場合でも、ＣＢＱ−ＮｚＱ３
はモールド内で凝集してクラスター化せず分散捕捉され
ていくので成品欠陥として顕在化することはない。Therefore, Ca0-klz03 flows out to the mold.
Only extremely small particles flow out, but even if they cannot float in the mold and are captured by the slab, CBQ-NzQ3
Since the particles do not aggregate and form clusters in the mold, but are dispersed and captured, they do not manifest as product defects.
次に本発明の具体的な実施方法について述べる。Next, a concrete implementation method of the present invention will be described.
本発明で脱酸用として用いるｊＶ、 Ｃａｂ、 ＣａＦ
ｚの結合体、混合体はその脱酸場所、脱酸タイミング等
により操業に適した形状の結合体、混合体とすれば良い
が、その結合体あるいは混合体について第１図、第２図
を用いて説明する。jV, Cab, CaF used for deoxidation in the present invention
The combination or mixture of I will explain using
第１図は、Ｍパイプ１の中に、ＣａＯ２又はＣａｂ。In FIG. 1, an M pipe 1 contains CaO2 or Cab.
ＣａＦ、の混合剤２′を充填し、これをカッター３で添
加に適した大きさに切断したＡＩ、 Ｃ，ｌｌＯの結合
体４を示す。もちろん溶鋼中への添加を容易にするため
Ｍパイプを鉄で被覆してもよい。A composite body 4 of AI, C, and 11O is shown filled with a mixture 2' of CaF and cut with a cutter 3 into a size suitable for addition. Of course, the M pipe may be coated with iron to facilitate addition to molten steel.
第２図は混合体について説明するものであり、Ｍ粉５と
ＣａＯ１又はＣａｂ、 ＣａＦ、混合粉６を混合して混
合体７をつくり、該混合体７は粉状で添加しても良いし
、ある程度のブリケット状に固めて添加しても良い。添
加の場所、タイミングはそれぞれの精錬工程での設備上
の制約や操業上の制約が考えられるので特定は出来ない
が転炉から取鍋への出鋼中の出鋼流に添加してもよいし
、真空脱ガス装置内で添加してもよいし、取鍋でのバブ
リング中の添加、又その他二次精錬での処理中に添加し
てもその効果は変わらない。FIG. 2 explains a mixture, in which a mixture 7 is made by mixing M powder 5 and CaO1 or Cab, CaF, mixed powder 6, and the mixture 7 may be added in powder form or , it may be added after being hardened into a certain degree of briquette shape. The location and timing of addition cannot be determined because of equipment and operational constraints in each refining process, but it may be added to the tapped stream during tapping from the converter to the ladle. However, the effect remains the same even if it is added in the vacuum degasser, added during bubbling in a ladle, or added during other secondary refining processes.
添加する本発明の複合体の形状は操業実態に合致した操
業性の良い形状、大きさ、混合比率を考慮して決定すれ
ばよい。The shape of the composite of the present invention to be added may be determined by considering the shape, size, and mixing ratio that provide good operability and match the actual operating conditions.
本発明の溶鋼の脱酸方法を用いるのは、例えば第３図の
如（、吹錬終了後転炉９を傾動し溶鋼１０を取鍋ＩＩへ
出鋼する際、ＡＩとＣａＯ１又はＭＣａＯ、ＣａＦｚの
結合体４を添加しても良いし、第４図の如く、出鋼後に
溶鋼１０を不活性ガス１２で撹拌しながら結合体４を添
加しても良いし、第５図の如く、溶鋼工０を不活性ガス
１２で撹拌しながら、浸漬管１３を溶鋼中に浸漬して結
合体４を添加してもよい。また、第６図のように真空脱
ガス槽１４内において、結合体４を添加してもよいし、
ＮとＣａＯ１又はＡＩ、 ＣａＯ、ＣａＦｚの混合体７
を、不活性ガスと共に直接溶鋼１０中に吹き込んでもよ
い。The method of deoxidizing molten steel of the present invention is used, for example, as shown in FIG. As shown in FIG. 4, the bond 4 may be added while stirring the molten steel 10 with an inert gas 12 after tapping, as shown in FIG. The bonded body 4 may be added by dipping the dip tube 13 into the molten steel while stirring the process 0 with an inert gas 12.Alternatively, as shown in FIG. 4 may be added,
Mixture of N and CaO1 or AI, CaO, CaFz 7
may be directly blown into the molten steel 10 together with an inert gas.
本発明の脱酸方法は前述した以外に、いかなる場所に用
いても良く、用いる場所を特定するものではない。The deoxidizing method of the present invention may be used at any location other than the one described above, and the location where it is used is not specified.
次に本発明の実施例について述べる。Next, embodiments of the present invention will be described.
（実施例）
実施例（１〕
電縫管用のＩ’Ｊ −Ｓ ｉ−キルド鋼についてＲＨで
の真空処理中にＡＺ＋ Ｃａｂ、 ＣａＰｚの結合体を
用いて脱酸を実施したチャージとＭの単独脱酸を実施し
たチャージと介在物の形態比較及び成品でのＵＳＴ発生
率の比較を行った。その試験結果を以下に示す。(Example) Example (1) I'J-S i-killed steel for electric resistance welded pipes was deoxidized using a combination of AZ+Cab and CaPz during vacuum treatment at RH.Charge and M alone A comparison was made of the morphology of inclusions and the incidence of UST in the charge that had been deoxidized.The test results are shown below.
試験チャージの成分系と脱酸方法を第１表に、鋼管シー
ム部ＵＳＴ不良率比較（４５％斜角深傷。Table 1 shows the composition of the test charge and the deoxidizing method, and a comparison of the UST defective rate at the seam of steel pipes (45% deep oblique scratches).
８０％リジェクト）を第７図に、介在物形態調査結果（
鋳片カットサンプルからの介在物抽出）を第８図に示す
。Figure 7 shows the results of the inclusion morphology investigation (80% rejected).
Figure 8 shows the extraction of inclusions from cut slab samples.
実施例〔２］
低炭素Ａ／−キルド鋼について二次精錬での合金添加中
ＡｔのみならびにＮとＣａｂ、 ＣａＦ、の結合体を添
加しその後回−の鋳造、圧延条件を施した板厚０、８
ｍｍの冷延薄板で製品での「ふくれ」 「スリバー」
の発生率を比較調査した。Example [2] For low carbon A/-killed steel, only At and a combination of N, Cab, and CaF were added during alloy addition in secondary refining, and subsequent casting and rolling conditions were applied to obtain a plate with a thickness of 0. , 8
``Bulge'' and ``sliver'' in cold-rolled thin sheets of mm
A comparative study was conducted on the incidence of
試験チャージの成分系と脱酸方法を第２表に、成品「ふ
くれ」発生比較（酸洗後の熱延板を目視検査）を第９図
に、成品Ｕスリバー」発生比較（冷延、焼鈍後の表面を
目視検査）を第１０図に示す。Table 2 shows the component system and deoxidizing method of the test charge, Figure 9 shows a comparison of the occurrence of "blister" in the finished product (visual inspection of the hot rolled sheet after pickling), and comparison of the occurrence of "U sliver" in the finished product (cold rolled, annealed). A visual inspection of the subsequent surface is shown in FIG.
０
第９図、第１０図にみられるように純Ｍの単独脱酸チャ
ージに比較して凝集Ｍ２Ｏ３に起因する［ふくれＪ
「スリバー」は結合体脱酸を実施することにより低減し
結合体脱酸によるＡｌ２Ｏ，の制御効果が確認出来た。0 As seen in Figs. 9 and 10, compared to the single deoxidizing charge of pure M, the [bulge J
"Sliver" was reduced by deoxidizing the conjugate, and the effect of controlling Al2O by deoxidizing the conjugate was confirmed.
実施例〔３〕
極低炭素ＡＩ −Ｔ ｉ−キルド鋼についてＲＨでの脱
炭終了後に混合体を粉状でＲＨの下部槽から吹き込み、
比較にＮの単独脱酸を行ったものと同一条件で連続鋳造
、圧延を行い成品厚み０．７５ｍｍの溶融亜鉛成品で「
ふくれ」 「スリバー」の発生率を比較調査した。Example [3] Regarding ultra-low carbon AI-T i-killed steel, after the decarburization at RH was completed, a mixture was blown in powder form from the lower tank of RH,
For comparison, a molten zinc product with a thickness of 0.75 mm was produced by continuous casting and rolling under the same conditions as those in which N was deoxidized alone.
A comparative study was conducted on the incidence of blister and sliver.
試験チャージの成分系と脱酸方法を第３表に、成品「ふ
くれ」発生比較（酸洗後の熱延板を目視検査）を第１１
図に、成品「スリバー」発生比較（冷延、溶融亜鉛メツ
キ後の成品表面を目視検査）を第１２図に示す。The component system and deoxidizing method of the test charge are shown in Table 3, and the comparison of the occurrence of "blister" in the finished product (visual inspection of the hot rolled sheet after pickling) is shown in Table 11.
FIG. 12 shows a comparison of the occurrence of "sliver" in the finished product (visual inspection of the surface of the product after cold rolling and hot-dip galvanizing).
２
第１１図、第１２図にみられるように純Ｍの単独脱酸チ
ャージに比較して凝集Ｕ、Ｏ，に起因する「ふくれ」
「スリバー」は混合体のＲＨ下部槽吹き込みにより大
幅に低減し混合体脱酸によるｌｌＶ２Ｏ３の制御効果が
確認出来た。2 As seen in Figures 11 and 12, "blister" caused by agglomerated U, O, compared to pure M alone deoxidized charge.
"Sliver" was significantly reduced by blowing the mixture into the RH lower tank, and the effect of controlling 11V2O3 by deoxidizing the mixture was confirmed.
尚、本発明に用いる結合体や混合体はＮとＣａ（Ｌ又は
／Ｖ、 Ｃａｂ、 ＣａＦｚを脱酸剤添加プロセスに合
わせて結合、混合を任意に選択すればよくその組成構成
比率は例えば重量比率で〔第４表〕に示す構成比率のも
のが好ましい。In addition, the combination or mixture used in the present invention may be arbitrarily selected to combine or mix N and Ca (L or /V, Cab, CaFz) according to the deoxidizing agent addition process. Those having the composition ratios shown in [Table 4] are preferable.
又、添加量は従来のＭ添加量に対しＭが同等量になるよ
うに添加する。この際、脱酸前の溶鋼酸素レベルが高く
生成するｌＶ２Ｏ３量が多いものほどＣａＯ比率を高め
るのが効果的である。Further, the amount of M to be added is the same as that of the conventional amount of M added. At this time, it is more effective to increase the CaO ratio when the molten steel has a higher oxygen level before deoxidation and a larger amount of lV2O3 is generated.
〔第４表〕複合脱酸剤の組成比率例
４
特にＣａＦｚを混入する意味はＣａＯの滓化を促進させ
効率的なＡｌｚＯ：＋吸着を容易にするものであるが一
般には耐火物の溶損にも影響するので混合量は脱酸剤添
加の方法、温度条件、炉材条件等を勘案し決定すればよ
い。[Table 4] Composition ratio example 4 of composite deoxidizer 4 The meaning of mixing CaFz in particular is to promote the formation of CaO into slag and facilitate efficient AlzO:+ adsorption, but in general, it causes erosion of refractories. The mixing amount may be determined by taking into consideration the method of adding the deoxidizing agent, temperature conditions, furnace material conditions, etc.
（発明の効果）
本発明によれば溶鋼を脱酸すると同時に成品欠陥の原因
となるミクロＮ２Ｏ３を同時添加のＣａＯが吸着し成品
でのｒＵＳＴ欠陥」 「ふ（れ」 「スリバー」等の大
幅な低減が可能となりその効果は極めて大きいものであ
る。(Effects of the Invention) According to the present invention, at the same time as it deoxidizes molten steel, the simultaneously added CaO adsorbs micro-N2O3, which causes product defects, and significantly reduces rUST defects, ``flare'', ``sliver'', etc. in the product. The reduction is possible and the effect is extremely large.
第１図は本発明に用いる結合体を示す説明図、第２図は
同じく混合体を示す説明図、第３〜第６図は本発明の脱
酸方法の適用例を示す図、第７図および第８図は実施例
１の試験結果を示す図、第９図および第１０図は実施例
２の試験結果を示す図、第１１図および第１２図は実施
例３の試験結果を示す図である。
５
特開平３
４７９１０ （６）
第７図
第８図
側胴■冊 ＣａＪＪ−０系
口＝ｊ ｋｌｚ０３系
一］ その他組成
第９図
第釦口FIG. 1 is an explanatory diagram showing a conjugate used in the present invention, FIG. 2 is an explanatory diagram also showing a mixture, FIGS. 3 to 6 are diagrams showing application examples of the deoxidizing method of the present invention, and FIG. 8 shows the test results of Example 1, FIGS. 9 and 10 show the test results of Example 2, and FIGS. 11 and 12 show the test results of Example 3. It is. 5 JP-A-3 47910 (6) Fig. 7 Fig. 8 Side trunk ■ Book CaJJ-0 series opening = j klz03 series 1] Other composition Fig. 9 Button opening
Claims (1)
ルミニウム、ＣａＯ、ＣａＦ＿２の結合体又は、混合体
を添加し、生成する介在物をＣａＯ−Ａｌ＿２Ｏ＿３系
組成とさせて脱酸することを特徴とする溶鋼の脱酸方法
。It is characterized by adding metallic aluminum, CaO, or a combination or mixture of metallic aluminum, CaO, and CaF_2 to undeoxidized molten steel, and deoxidizing the generated inclusions by making them have a CaO-Al_2O_3-based composition. Method for deoxidizing molten steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18046689A JPH0347910A (en) | 1989-07-14 | 1989-07-14 | Method for deoxidizing molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18046689A JPH0347910A (en) | 1989-07-14 | 1989-07-14 | Method for deoxidizing molten steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0347910A true JPH0347910A (en) | 1991-02-28 |
Family
ID=16083716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18046689A Pending JPH0347910A (en) | 1989-07-14 | 1989-07-14 | Method for deoxidizing molten steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0347910A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07189371A (en) * | 1993-12-10 | 1995-07-28 | Clestra Hauserman | Partition wall system with floating column |
| JP2002363690A (en) * | 2001-06-01 | 2002-12-18 | Daido Steel Co Ltd | Steel for plastic molding die |
| JP2014527581A (en) * | 2012-07-19 | 2014-10-16 | 中国科学院金属研究所 | Method of controlling A segregation of steel ingot by cleaning molten steel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58141319A (en) * | 1982-02-12 | 1983-08-22 | Showa Denko Kk | Manufacture of metal refining agent |
| JPS58141320A (en) * | 1982-02-12 | 1983-08-22 | Showa Denko Kk | Metal refining agent |
| JPS5956514A (en) * | 1982-09-25 | 1984-04-02 | Nisshin Steel Co Ltd | Method for deoxidizing and desulfurizing molten stainless steel |
-
1989
- 1989-07-14 JP JP18046689A patent/JPH0347910A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58141319A (en) * | 1982-02-12 | 1983-08-22 | Showa Denko Kk | Manufacture of metal refining agent |
| JPS58141320A (en) * | 1982-02-12 | 1983-08-22 | Showa Denko Kk | Metal refining agent |
| JPS5956514A (en) * | 1982-09-25 | 1984-04-02 | Nisshin Steel Co Ltd | Method for deoxidizing and desulfurizing molten stainless steel |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07189371A (en) * | 1993-12-10 | 1995-07-28 | Clestra Hauserman | Partition wall system with floating column |
| JP2002363690A (en) * | 2001-06-01 | 2002-12-18 | Daido Steel Co Ltd | Steel for plastic molding die |
| JP4626092B2 (en) * | 2001-06-01 | 2011-02-02 | 大同特殊鋼株式会社 | Steel for plastic molds |
| JP2014527581A (en) * | 2012-07-19 | 2014-10-16 | 中国科学院金属研究所 | Method of controlling A segregation of steel ingot by cleaning molten steel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| ES2333417T3 (en) | STEEL PRODUCT WITH REDUCED AMOUNT OF ALUMINUM AGGREGATES. | |
| JPH09263820A (en) | Production of cluster-free aluminum killed steel | |
| JP7119642B2 (en) | steel manufacturing method | |
| JPH0347910A (en) | Method for deoxidizing molten steel | |
| JP2020002406A (en) | Manufacturing method of steel | |
| JP4430341B2 (en) | Steel material with few alumina clusters | |
| JP2005002422A (en) | Method for producing steel material with little alumina cluster | |
| JP2005002421A (en) | Method for producing steel material with little alumina cluster | |
| JP4430285B2 (en) | Manufacturing method of steel material with few alumina clusters | |
| JP3742619B2 (en) | Low carbon steel slab manufacturing method | |
| JP7119641B2 (en) | steel manufacturing method | |
| WO2010008017A1 (en) | Process for production of cast slab of low-carbon steel | |
| JP2005002420A (en) | Steel having little alumina cluster, and its production method | |
| JP4392364B2 (en) | Method for producing ultra-low carbon steel | |
| JP2005002419A (en) | Method for producing steel material with little alumina cluster | |
| JP3677994B2 (en) | Steel plate for cans and steel plate for cans with excellent cleanability | |
| JP3903603B2 (en) | Melting method of ultra-low carbon steel with excellent cleanability | |
| JP2001105101A (en) | Melting method of steel plate for thin sheet | |
| JPH07300611A (en) | Production of molten steel for continuous casting | |
| JP2001032014A (en) | Method for manufacturing steel plate for sheet steel | |
| JPH0625731A (en) | Deoxidation method of molten steel | |
| JP2005139492A (en) | Reforming agent for inclusion in molten steel, and method for producing low carbon steel cast slab | |
| JPH07300614A (en) | Production of molten steel for continuous casting | |
| CN115533367A (en) | Dephosphorizing and desulfurizing sintered flux and preparation method thereof | |
| JPH07207403A (en) | Slab for producing cold rolled sheet |