JP4493612B2 - Continuous casting method of aluminum killed steel - Google Patents
Continuous casting method of aluminum killed steel Download PDFInfo
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- JP4493612B2 JP4493612B2 JP2006064459A JP2006064459A JP4493612B2 JP 4493612 B2 JP4493612 B2 JP 4493612B2 JP 2006064459 A JP2006064459 A JP 2006064459A JP 2006064459 A JP2006064459 A JP 2006064459A JP 4493612 B2 JP4493612 B2 JP 4493612B2
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- nozzle
- steel
- aluminum killed
- continuous casting
- mass
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 21
- 229910052782 aluminium Inorganic materials 0.000 title claims description 21
- 229910000655 Killed steel Inorganic materials 0.000 title claims description 12
- 238000009749 continuous casting Methods 0.000 title claims description 12
- 238000000034 method Methods 0.000 title claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- 229910001220 stainless steel Inorganic materials 0.000 claims description 8
- 239000010935 stainless steel Substances 0.000 claims description 8
- 239000011651 chromium Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 239000010459 dolomite Substances 0.000 claims description 2
- 229910000514 dolomite Inorganic materials 0.000 claims description 2
- 238000007531 graphite casting Methods 0.000 claims description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 20
- 235000012255 calcium oxide Nutrition 0.000 description 20
- 239000000292 calcium oxide Substances 0.000 description 20
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 13
- 238000005266 casting Methods 0.000 description 8
- 238000007654 immersion Methods 0.000 description 8
- 230000008018 melting Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 239000010439 graphite Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000004901 spalling Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
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- Continuous Casting (AREA)
Description
本発明は、ＣａＯ成分を含有する鋳造用ノズルを用いて行うアルミキルド鋼、とりわけクロムを含有したアルミキルドステンレス鋼の連続鋳造方法に関する。 The present invention relates to a continuous casting method of aluminum killed steel, particularly aluminum killed stainless steel containing chromium, which is performed using a casting nozzle containing a CaO component.
鋳造用ノズルには、取鍋からタンディッシュに溶鋼を注入するのに用いるロングノズル、タンディッシュからモールドに溶鋼を注入するのに用いる浸漬ノズルがあり、その材質には主にアルミナ−黒鉛質が用いられている。アルミナ−黒鉛質は、耐スポーリング性、耐摩耗性、耐蝕性に優れているが、アルミキルド鋼の鋳造に用いた場合、鋼中のアルミが酸化して形成されるアルミナがノズル内孔面に付着してクラスタ化し、これが成長して大型の介在物となっては溶鋼流に剥ぎ取られて鋳片内に取込まれ、品質を低下させたり、ノズル内孔面に付着する介在物がより一層大きく成長してノズルを絞るノズル閉塞を生じたりする。この対策としてノズル内孔面からアルゴンガスを溶鋼中に吹き込んでアルミナの付着を阻止することが試みられているが、アルゴンガスの吹き込み量が多くなると、その気泡が鋳片内に取込まれてピンホールとなる欠陥を生じがちである。このためガスの吹き込み量には制約があって、必ずしも十分な対策とは成り得ていなかった。このほかの対策として、ノズルを構成する耐火材自体にアルミナ付着防止機能を持たせたものも知られる。下記特許文献１には、黒鉛と焼結カルシア、電融カルシア又はＣａＯ成分を含むほかの窯業用原料と、残部が耐火性骨材粉からなり、ＣａＯ成分が２０〜７５質量％である混合粉を主成分とする耐火物を使用した鋳造用ノズルが開示されている。
ノズルにＣａＯを含有する耐火物を用いると、ＣａＯを含有する耐火物が有するアルミナの吸着作用と、ＣａＯとアルミナが反応して生成されるＣａＯ−Ａｌ２Ｏ３系物質が低融点で液相を呈するため、ノズル内孔面が平滑になり、アルミナの付着を防止する作用との相乗効果により鋳片内のアルミナ系大型介在物の含有量を減少させることができるが、ＣａＯの含有量は、鋳片中のアルミナ系大型介在物の存在を低減させる効果からいうと、多いほど望ましいが、反面、ＣａＯ成分が多くなると、溶損が大きくなる嫌いがある。 When a refractory containing CaO is used for the nozzle, the adsorption action of alumina possessed by the refractory containing CaO and the CaO—Al 2 O 3 based material produced by the reaction of CaO and alumina have a low melting point and a liquid phase. Therefore, the inner surface of the nozzle becomes smooth, and the content of alumina inclusions in the slab can be reduced by a synergistic effect with the action of preventing the adhesion of alumina, but the content of CaO is In terms of the effect of reducing the presence of large alumina inclusions in the slab, the larger the amount, the better, but on the other hand, the more the CaO component, the greater the discomfort.
本発明は、ＣａＯを２０質量％以上含有する鋳造用ノズルを用いて行うアルミキルド鋼の連続鋳造方法において、ノズルの溶損を改善することを目的とする。 An object of the present invention is to improve nozzle melting loss in a continuous casting method of aluminum killed steel using a casting nozzle containing 20 mass% or more of CaO.
請求項１に係わる発明は、ＣａＯを２０質量％以上含有するドロマイトグラファイト質の鋳造用ノズルを用いて行うアルミキルド鋼の連続鋳造方法において、鋼中のＡｌ含有量を０．１５質量％以下とし、ノズルを通る溶鋼の平均流速を９００〜１６００ｍｍ／ｓｅｃにしたことを特徴とする。 The invention according to claim 1 is an aluminum killed steel continuous casting method that is performed using a dolomite graphite casting nozzle containing 20 mass% or more of CaO, wherein the Al content in the steel is 0.15 mass% or less, The average flow velocity of the molten steel passing through the nozzle is set to 900 to 1600 mm / sec.
本発明において、鋳造用ノズルのＣａＯ含有量を２０質量％以上としたのは、２０質量％未満ではアルミナの吸着能力とアルミナ付着防止能力が小さく、鋳片内のアルミナ系大型介在物の含有量の改善の程度が小さいためであり、ＣａＯの含有量の上限を６０質量％としたのは、ＣａＯ量が多くなると、溶損が大きくなるためである。
In the present invention, the CaO content of the casting nozzle is set to 20% by mass or more. When the CaO content is less than 20% by mass, the alumina adsorption ability and the alumina adhesion preventing ability are small, and the content of the alumina-based inclusions in the slab is small. der for a low level of improvement in is, was a 60 wt% the upper limit of the content of CaO, when the amount of CaO increases, because the erosion increases.
図１は、Ｃｒ系アルミキルドステンレス鋼を連続鋳造したときの浸漬ノズル内孔面に付着するアルミナ介在物の付着速度とＣａＯ量との関係を示す図で、図で見られるように、ノズルのＣａＯ含有量が２０質量％以上の場合、ＣａＯの含有量が０のものと比べ、介在物の付着速度が大幅に低下していることが見られる。 FIG. 1 is a diagram showing the relationship between the deposition rate of alumina inclusions adhering to the inner surface of a submerged nozzle and the amount of CaO when Cr-based aluminum killed stainless steel is continuously cast. When the content is 20% by mass or more, it can be seen that the deposition rate of inclusions is greatly reduced as compared with the case where the content of CaO is 0.
ノズルに炭素を含有させたのは、耐スポーリング性を改善させるためで、その含有量を１〜４０質量％としたのは、ノズルの耐溶損、耐磨耗性を向上させるためである。図２は、アルミキルドステンレス鋼の連続鋳造に用いる浸漬ノズルにおいて、カーボン含有量と耐磨耗性との関係を示す図で、指数は、カーボン量を６０重量％としたときの耐摩耗性を１００としたものである。
請求項２に係わる発明は、請求項１に係わる発明において、アルミキルド鋼はクロムを１０〜３０質量％含有するアルミキルドステンレス鋼であることを特徴とする。
The reason why carbon is contained in the nozzle is to improve the spalling resistance, and the content is set to 1 to 40% by mass in order to improve the melt resistance and wear resistance of the nozzle. FIG. 2 is a graph showing the relationship between the carbon content and the wear resistance in an immersion nozzle used for continuous casting of aluminum killed stainless steel. The index indicates the wear resistance when the carbon content is 60% by weight. It is what.
The invention according to
本発明によると、ノズルにＣａＯを２０質量％以上含有する耐火物を用いたことにより、鋳片内のアルミナ系大型介在物の含有量を減少させ、品質を向上させることができると共に、ＣａＯを含有したことによりもたらされる欠点である、溶損をアルミキルド鋼中のＡｌ含有量を０．１５質量以下とし、かつノズルを通過する溶鋼の平均流速を９００〜１６００ｍｍ／ｓｅｃにすることにより改善することができる。 According to the present invention, by using a refractory containing 20% by mass or more of CaO in the nozzle, the content of large alumina inclusions in the slab can be reduced and the quality can be improved. Improvement of melting loss by setting the Al content in aluminum killed steel to 0.15 mass or less and the average flow rate of molten steel passing through the nozzle to 900 to 1600 mm / sec, which is a defect caused by the inclusion. Can do.
図３は、本発明方法で用いる浸漬ノズル１、すなわちタンディッシュ２からモールド３に溶鋼を注入するのに用いる内径６０ｍｍの浸漬ノズル１について示すもので、モールドは幅７００〜１３８０ｍｍ、厚み２００ｍｍである。図中、４は溶鋼流を制御するストッパーである。
FIG. 3 shows the immersion nozzle 1 used in the method of the present invention, that is, the immersion nozzle 1 having an inner diameter of 60 mm used to inject molten steel from the tundish 2 into the
連続鋳造は、図３に示すタンディッシュ２に１０〜３０質量％のクロムを含有するアルミキルドステンレス鋼の溶鋼を入れて行い、数チャージごとにモールド３を出たスラブの板幅、板厚及び鋳造速度から浸漬ノズル１を通る溶鋼の平均流速を求めると共に、このとき得られたスラブから鋼中のＡｌ濃度を求めた。そして数チャージごとに浸漬ノズル１の溶損や閉塞の程度を目視により観察した。結果を図４に示す。また、このとき使用した浸漬ノズルの成分を表１に示す。
Continuous casting is carried out by putting molten steel of aluminum killed stainless steel containing 10 to 30% by mass of chromium in the tundish 2 shown in FIG. 3, and the width, thickness and casting of the slab that comes out of the
図４に示されるように、Ｃｒ系アルミキルドステンレス鋼の連続鋳造において、鋼中のＡｌ濃度が０．１５質量％以下であり、かつノズル１を通る溶鋼の平均流速が９００〜１６００ｍｍ／ｓｅｃであると、ノズル１に溶損や閉塞が認められなかった。 As shown in FIG. 4, in the continuous casting of Cr-based aluminum killed stainless steel, the Al concentration in the steel is 0.15% by mass or less, and the average flow velocity of the molten steel passing through the nozzle 1 is 900 to 1600 mm / sec. No nozzle 1 was melted or clogged.
本発明は、アルミキルド鋼、とりわけＣｒ系アルミキルドステンレス鋼の連続鋳造に用いられる。 The present invention is used for continuous casting of aluminum killed steel, particularly Cr-based aluminum killed stainless steel.
１・・浸漬ノズル
２・・タンディッシュ
３・・モールド
４・・ストッパー
1 ....
Claims (2)
2. The method of continuous casting of aluminum killed steel according to claim 1, wherein the aluminum killed steel is aluminum killed stainless steel containing 10 to 30% by mass of chromium.
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| JP2006064459A JP4493612B2 (en) | 2006-03-09 | 2006-03-09 | Continuous casting method of aluminum killed steel |
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|---|---|---|---|
| JP2006064459A JP4493612B2 (en) | 2006-03-09 | 2006-03-09 | Continuous casting method of aluminum killed steel |
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| JP2007237255A JP2007237255A (en) | 2007-09-20 |
| JP4493612B2 true JP4493612B2 (en) | 2010-06-30 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6144836A (en) * | 1984-08-08 | 1986-03-04 | Green Cross Corp:The | Substituted styrene derivative |
| JP2000001716A (en) * | 1998-06-18 | 2000-01-07 | Kawasaki Steel Corp | Method for melting chromium-containing steel |
| JP2004188421A (en) * | 2002-12-06 | 2004-07-08 | Sumitomo Metal Ind Ltd | Immersion nozzle for continuous casting and continuous casting method |
| JP2005262301A (en) * | 2004-03-22 | 2005-09-29 | Nippon Steel Corp | Immersion nozzle for continuous casting |
| JP2007231372A (en) * | 2006-03-01 | 2007-09-13 | Nisshin Steel Co Ltd | Method for producing aluminum-killed steel |
-
2006
- 2006-03-09 JP JP2006064459A patent/JP4493612B2/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6144836A (en) * | 1984-08-08 | 1986-03-04 | Green Cross Corp:The | Substituted styrene derivative |
| JP2000001716A (en) * | 1998-06-18 | 2000-01-07 | Kawasaki Steel Corp | Method for melting chromium-containing steel |
| JP2004188421A (en) * | 2002-12-06 | 2004-07-08 | Sumitomo Metal Ind Ltd | Immersion nozzle for continuous casting and continuous casting method |
| JP2005262301A (en) * | 2004-03-22 | 2005-09-29 | Nippon Steel Corp | Immersion nozzle for continuous casting |
| JP2007231372A (en) * | 2006-03-01 | 2007-09-13 | Nisshin Steel Co Ltd | Method for producing aluminum-killed steel |
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| JP2007237255A (en) | 2007-09-20 |
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