JP2010042421A - METHOD FOR CONTINUOUSLY CASTING HIGH Al-CONTAINING STEEL - Google Patents
METHOD FOR CONTINUOUSLY CASTING HIGH Al-CONTAINING STEEL Download PDFInfo
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- JP2010042421A JP2010042421A JP2008206714A JP2008206714A JP2010042421A JP 2010042421 A JP2010042421 A JP 2010042421A JP 2008206714 A JP2008206714 A JP 2008206714A JP 2008206714 A JP2008206714 A JP 2008206714A JP 2010042421 A JP2010042421 A JP 2010042421A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 33
- 239000010959 steel Substances 0.000 title claims abstract description 33
- 238000005266 casting Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 54
- 238000009749 continuous casting Methods 0.000 claims abstract description 23
- 239000000203 mixture Substances 0.000 claims abstract description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 8
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 6
- 229910018068 Li 2 O Inorganic materials 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000002844 melting Methods 0.000 description 7
- 230000008018 melting Effects 0.000 description 7
- 239000013078 crystal Substances 0.000 description 6
- 229910001678 gehlenite Inorganic materials 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 239000000155 melt Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
本発明は、Ａｌ含有量が０．７０％以上である高Ａｌ含有鋼を連続鋳造のモールド中への鋳込み初期から常に安定して良好な鋳片を製造し、この鋳片から得られた鋼製品の表面疵不良の発生を抑制する連続鋳造方法に関する。 The present invention always stably produces a good slab from the beginning of casting a high Al content steel having an Al content of 0.70% or more into a continuous casting mold, and the steel obtained from this slab. The present invention relates to a continuous casting method for suppressing the occurrence of surface flaws on products.
高Ａｌ含有鋼は、連続鋳造時にモールド内へのモールドパウダーの流入が悪いことに起因して、ブルームの凝固殻とモールド間で焼き付きが生じてブルームの表面割れや凹み、場合によっては引抜き中の鋳片にブレークアウトが発生する。このブルームの凹みや割れは、以下のメカニズムで発生することが分っている。通常使用するモールドパウダーでは、パウダー成分に含まれるＳｉＯ2と、溶鋼中に多く含有されるＡｌとが、３ＳｉＯ2＋４Ａｌ→３Ｓｉ＋２Ａｌ2Ｏ3で示される反応をする。このとき初期組成の塩基度が高い通常のモールドパウダーでは、このパウダーの反応により、高融点結晶であるゲーレナイト（２ＣａＯ・Ａｌ2Ｏ3・ＳｉＯ2）が生成し、スラグベアが生成して凝固殻とモールド間へのモールドパウダーの流入を妨げ潤滑が悪くなることにより、ブルームの表面割れや凹みが発生する。また、ＪＩＳで企画される高Ａｌ含有鋼のＡｌ含有量は質量％で０．７０〜１．２０％である。 High Al content steel is caused by poor flow of mold powder into the mold during continuous casting, resulting in seizure between the solidified shell of the bloom and the mold, resulting in surface cracks and dents in the bloom, and in some cases during drawing Breakout occurs in the slab. It has been found that the bloom dents and cracks are generated by the following mechanism. The mold powder for normal use, and SiO 2 contained in the powder component, and Al contained many in the molten steel, the reaction shown by 3SiO 2 + 4Al → 3Si + 2Al 2 O 3. At this time, in a normal mold powder having a high basicity of the initial composition, gelenite (2CaO.Al 2 O 3 .SiO 2 ), which is a high melting point crystal, is generated by the reaction of this powder, and slag bear is generated to form a solidified shell and The flow of mold powder between the molds is hindered and lubrication is deteriorated, so that the surface cracks and dents of the bloom occur. Moreover, the Al content of the high Al content steel planned by JIS is 0.70 to 1.20% by mass%.
そこで、高Ａｌ含有鋼の連続鋳造において、モールドパウダーのモールド内の反応や拡散、あるいは供給と消費のバランスなどに着目し、組成変動をしても高融点結晶であるゲーレナイトが晶出しないモールドパウダーを開発して適用することで、良好な鋳片を得ることが提案されている（例えば、特許文献１参照。）。 Therefore, in continuous casting of high Al-containing steel, focusing on the reaction and diffusion of the mold powder in the mold, or the balance between supply and consumption, etc., mold powder that does not crystallize gelenite which is a high melting point crystal even if the composition changes It has been proposed to obtain a good slab by developing and applying (see, for example, Patent Document 1).
また、モールドパウダー中のＦ含有量を高くすることでＡｌ2Ｏ3含有量が増大し、モールドパウダーの粘度変化を抑制することで、良好な鋳片を得ることが提案されている（たとえば、特許文献２参照。）。 Further, it has been proposed to obtain a good slab by increasing the content of F 2 in the mold powder and increasing the content of Al 2 O 3 and suppressing the viscosity change of the mold powder (for example, (See Patent Document 2).
さらにモールドパウダーの融剤成分としてＢａＯを用い、ゲーレナイトの析出を抑制して融点の低下と粘度の低下を図ることで、安定鋳造を達成することが提案されている（例えば、特許文献３参照。）。 Further, it has been proposed to achieve stable casting by using BaO as a flux component of the mold powder and suppressing the precipitation of gehlenite to lower the melting point and the viscosity (see, for example, Patent Document 3). ).
また、さらに高Ａｌ、Ｙ、希土類元素などの還元性成分を含有する鋼を連続鋳造する際に、溶融スラグの変質に起因する操業異常および鋳片品質の劣化を防止する方法が提案されている（例えば、特許文献４参照。）。 Further, a method has been proposed for preventing abnormal operation and deterioration of slab quality due to alteration of molten slag when continuously casting steel containing reducing components such as high Al, Y and rare earth elements. (For example, refer to Patent Document 4).
さらに、高Ａｌ含有鋼の連続鋳造用の、高融点結晶であるゲーレナイトの析出を抑制できるように調整したモールドパウダーが提案されている(例えば、特許文献５参照。）。 Furthermore, a mold powder adjusted to suppress precipitation of gehlenite, which is a high melting point crystal, for continuous casting of high Al content steel has been proposed (for example, see Patent Document 5).
しかし、高Ａｌ含有鋼の連続鋳造におけるこれらのモールドパウダーは、連続鋳造の定常状態で使用することを前提としており、モールドパウダーの滓化速度を抑制している。そのためには、モールドパウダーがすばやく滓化および溶融してモールドと鋳片の凝固殻の間に流入する必要がある、鋳込み初期には適用できないという問題がある。 However, these mold powders in continuous casting of high Al-containing steel are premised on use in a steady state of continuous casting, and suppress the mold powder hatching rate. For this purpose, there is a problem that the mold powder needs to quickly hatch and melt and flow between the mold and the solidified shell of the slab and cannot be applied at the beginning of casting.
以上のように、高Ａｌ含有鋼で起こるモールドパウダーの組成変動に対応し、かつ、モールドパウダーの滓化性を早め、連続鋳造の連々鋳初期に対応したモールドパウダーを用い、途中で滓化性を抑制した定常鋳造に適したモールドパウダーに切替えることにより、鋳込み初期から常に安定して良好な鋳片を製造可能とする、高Ａｌ含有鋼の連続鋳造技術は従来皆無であった。 As described above, it is possible to cope with mold powder composition fluctuations that occur in high Al content steels, accelerate mold powder hatchability, and use mold powder corresponding to the initial casting stage of continuous casting. Until now, there has been no continuous casting technology for high Al-containing steel that enables stable production of a stable slab from the beginning of casting by switching to a mold powder suitable for steady casting that suppresses the above.
本発明が解決しようとする課題は、高Ａｌ含有鋼の連続鋳造において、鋳込み初期から常に安定して良好な鋳片を製造し、この鋳片から得られた鋼製品の表面疵不良の発生を抑制する方法を提供することである。 The problem to be solved by the present invention is that in continuous casting of high Al content steel, a stable slab is always manufactured stably from the beginning of casting, and surface defects of steel products obtained from this slab are generated. It is to provide a method of suppressing.
上記の課題を解決するための本発明の手段は、請求項１の発明では、質量％で、全カーボン量≦５％で含有するモールドパウダーを鋳込み初期にモールド内に散布し、鋳込み開始後の１ヒート以内に５％＜全カーボン量≦１５％で含有するモールドパウダーをモールド内に追加散布して、Ａｌ含有量が０．７０％以上である鋼を連続鋳造することを特徴とする高Ａｌ含有鋼の連続鋳造方法である。 The means of the present invention for solving the above-mentioned problem is that in the invention of claim 1, the mold powder containing mass% and total carbon amount ≦ 5% is dispersed in the mold at the beginning of casting, High Al, characterized by continuous casting of steel with an Al content of 0.70% or more by additionally spraying a mold powder containing 5% <total carbon content ≦ 15% within 1 heat. This is a continuous casting method for contained steel.
請求項２の発明では、質量％で、鋳込み初期にモールド内に散布するモールドパウダーは全カーボン量≦５％、４５％≦ＳｉＯ2≦５５％、Ａｌ2Ｏ3≦１０％、１５≦ＣａＯ≦３０％、Ｎａ2Ｏ≦１５％、Ｆ≦１０％、ＭｇＯ≦１０％、Ｌｉ2Ｏ≦５％からなる組成Ａであり、鋳込み開始後１ヒート以内にモールド内に追加散布するモールドパウダーは５％＜全カーボン量≦１５％、４５％≦ＳｉＯ2≦５５％、Ａｌ2Ｏ3≦１０％、１５≦ＣａＯ≦３０％、Ｎａ2Ｏ≦１５％、Ｆ≦１０％、ＭｇＯ≦１０％、Ｌｉ2Ｏ≦５％からなる組成Ｂであることを特徴とする請求項１の手段の高Ａｌ含有鋼の連続鋳造方法である。 In the invention of claim 2, the mold powder dispersed in the mold at the initial stage of casting by mass% is the total carbon amount ≦ 5%, 45% ≦ SiO 2 ≦ 55%, Al 2 O 3 ≦ 10%, 15 ≦ CaO ≦ The composition powder is 30%, Na 2 O ≦ 15%, F ≦ 10%, MgO ≦ 10%, Li 2 O ≦ 5%, and 5 mold powders are additionally sprayed into the mold within 1 heat after casting starts. % <Total carbon content ≦ 15%, 45% ≦ SiO 2 ≦ 55%, Al 2 O 3 ≦ 10%, 15 ≦ CaO ≦ 30%, Na 2 O ≦ 15%, F ≦ 10%, MgO ≦ 10%, 2. The continuous casting method for high Al content steel according to claim 1, wherein the composition B is composed of Li 2 O ≦ 5%.
上記の手段としたことで、本発明の方法おけるモールドパウダーは鋳込み初期であっても、すぐに滓化および溶融してモールドと鋳片の凝固殻との間に流入し、かつ、モールド内でモールドパウダーの組成が変動しても、高融点結晶であるゲーレナイトを析出することがなく、本発明におけるモールドパウダーを使用することで、鋳片から得られた鋼製品の表面疵不良の発生率は０〜０．５％未満であり、極めて良好な製品が得られる。 By adopting the above means, the mold powder in the method of the present invention immediately hatches and melts and flows between the mold and the solidified shell of the slab, even in the initial casting, and in the mold Even if the composition of the mold powder fluctuates, there is no precipitation of gehlenite, which is a high melting point crystal, and by using the mold powder in the present invention, the occurrence rate of surface defects on steel products obtained from slabs is It is less than 0-0.5%, and a very good product is obtained.
本発明を実施するための最良の形態を表を参照して説明する。第１の形態では、質量％で、０．７０％以上のＡｌ含有率である高Ａｌ含有鋼の連続鋳造方法において、モールドパウダーがモールド内で溶鋼中の鋼成分のＡｌと反応しきった後でも、高融点結晶であるゲーレナイトを生成することがないように、モールドパウダーの組成を設計した。すなわち、パウダーの初期組成を低ＣａＯ／ＳｉＯ2化することでＳｉＯ2濃度が高い側へ初期組成が移動し、反応によってパウダーが組成変動しても、高融点結晶（ゲーレナイト）析出領域に入らないように設計した。さらに、鋳込みの初期で使用するモールドパウダーは、モールドパウダーの全炭素量Ｔ．Ｃを５％以下とし、このモールドパウダーをモールド内に投入した後、モールドパウダーがすぐに滓化および溶融して、鋳込み初期から確実にモールドと鋳片の凝固殻との間へ流入して潤滑性を発揮できるものとした。鋳込み初期の滓化性を早めたモールドパウダーで鋳込みを開始し、その後は１ヒート以内に全炭素量Ｔ．Ｃを５％＜Ｔ．Ｃ≦１５％としたモールドパウダーに切替えてモールド内に追加散布して高Ａｌ含有鋼の連続鋳造の操業をした。ここでいう鋳込み初期とは、鋳込みスタート直後であるが、そこで投入したパウダーの量により、通常部用のパウダーの投入開始時期も異なる。また、通常部ではパウダーのＣ量が５％＜Ｔ．Ｃ＜１５％でないと、保温性などの問題から不具合を起こす。 The best mode for carrying out the present invention will be described with reference to the table. In the first embodiment, in the continuous casting method of high Al content steel having an Al content of 0.70% or more by mass%, even after the mold powder has completely reacted with the steel component Al in the molten steel in the mold. The composition of the mold powder was designed so as not to generate gehlenite which is a high melting point crystal. That is, by reducing the initial composition of the powder to low CaO / SiO 2 , the initial composition moves to the higher SiO 2 concentration side, and even if the powder changes in composition due to the reaction, it does not enter the high melting point crystal (gerenite) precipitation region. Designed as follows. Further, the mold powder used at the initial stage of casting is the total carbon content T.I. C is set to 5% or less, and after this mold powder is put into the mold, the mold powder immediately hatches and melts, and reliably flows from the initial stage of casting into the solidified shell of the slab and lubricates. It was supposed to be able to demonstrate its properties. Casting was started with mold powder that had accelerated hatchability at the beginning of casting, and after that, the total carbon content T.I. C is 5% <T. The mold powder was changed to C ≦ 15% and additionally sprayed into the mold to perform continuous casting of high Al content steel. The initial casting time here is immediately after the start of casting, but the start timing of the powder for the normal part varies depending on the amount of powder charged there. In the normal part, the C content of the powder is 5% <T. If it is not C <15%, a problem occurs due to problems such as heat retention.
第２の形態では、上記の形態の連続鋳造方法において、鋳込み初期に投入するモールドパウダーを組成Ａとし、その後の１ヒート以内に追加するモールドパウダーを組成Ｂとするとき、これらの化学組成を表１に示す。 In the second mode, in the continuous casting method of the above mode, when the mold powder to be added at the beginning of casting is the composition A and the mold powder to be added within 1 heat thereafter is the composition B, these chemical compositions are represented. It is shown in 1.
表２に示す仕様の３ストランドを有する完全垂直式の鋳型内のメニスカスから引抜き用のピンチロールの上端までの長さが２５．３ｍのブルームの連続鋳造装置により、Ａｌ含有量が０．７０％以上である高Ａｌ含有鋼の溶鋼を最大で０．６５ｍ／ｍｉｎの鋳造速度で連続鋳造し、サイズ３８０ｍ×９０ｍｍの鋳片を切断長さ３．０〜４．５ｍとして製造した。 By using a continuous casting apparatus having a length of 25.3 m from a meniscus in a completely vertical mold having three strands having the specifications shown in Table 2 to the upper end of a pinch roll for drawing, the Al content is 0.70%. The above molten steel of high Al content steel was continuously cast at a casting speed of 0.65 m / min at the maximum, and a slab of size 380 m × 90 mm was manufactured with a cutting length of 3.0 to 4.5 m.
この連続鋳造においては、本発明により開発した表３に示す化学組成の鋳込初期のモールドパウダーおよびその後の１ヒート以内に追加するモールドパウダーとして通常のモールドパウダーを適用して連続鋳造した。 In this continuous casting, continuous casting was performed by applying ordinary mold powder as a mold powder in the initial stage of casting having a chemical composition shown in Table 3 developed according to the present invention and a mold powder to be added within 1 heat thereafter.
モールドパウダーは鋳込み初期であっても、すぐに滓化および溶融してモールドと鋳片の凝固殻との間に流入し、さらにモールド内でモールドパウダーの組成が変動しても、高融点結晶であるゲーレナイトを析出することがなく、本発明におけるモールドパウダーを使用することで、鋳片から得られた鋼製品の表面疵不良の発生率は、表４に示すようにテスト１〜５の全てにおいて、０〜０．５％未満の◎であって、極めて良好な製品が得られた。 Even at the initial casting stage, the mold powder immediately hatches and melts and flows between the mold and the solidified shell of the slab, and even if the composition of the mold powder varies within the mold, By using the mold powder in the present invention without precipitating some gehlenite, the occurrence rate of surface defect of the steel product obtained from the slab is as shown in Table 4 in all tests 1 to 5. 0 to less than 0.5%, and a very good product was obtained.
これに対して、従来のモールドパウダーで製造した比較例１〜１７では、表５に示す評価の◎から〇、△、×までと表面疵不良重量率の０．５％未満の極めて良いものから１０％以上のよくないものまで広範であった。 On the other hand, in Comparative Examples 1 to 17 manufactured with conventional mold powders, the evaluations shown in Table 5 from ◎ to 、, △, × and from the extremely good ones of less than 0.5% of the surface flaw defect weight ratio It was extensive up to over 10% bad.
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| JP2012030248A (en) * | 2010-07-29 | 2012-02-16 | Sanyo Special Steel Co Ltd | Continuous casting method for steel |
| CN106270429A (en) * | 2015-06-09 | 2017-01-04 | 宝山钢铁股份有限公司 | Hypoergia covering slag and preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012030248A (en) * | 2010-07-29 | 2012-02-16 | Sanyo Special Steel Co Ltd | Continuous casting method for steel |
| CN106270429A (en) * | 2015-06-09 | 2017-01-04 | 宝山钢铁股份有限公司 | Hypoergia covering slag and preparation method |
| CN106270429B (en) * | 2015-06-09 | 2018-10-02 | 宝山钢铁股份有限公司 | Hypoergia covering slag and preparation method |
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