JP4402560B2 - Mold powder for continuous casting of high aluminum steel and method of continuous casting of high aluminum steel - Google Patents
Mold powder for continuous casting of high aluminum steel and method of continuous casting of high aluminum steel Download PDFInfo
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Description
連続鋳造設備で高アルミニウム鋼を連続鋳造するときに発生する鋳片の表面欠陥を低減し、かつ、引き抜き時のブレークアウトの発生を防止することができるモールドパウダーおよびこのモールドパウダーを用いた高アルミニウム鋼の連続鋳造方法に関する。 Mold powder capable of reducing surface defects of slabs that occur when continuously casting high aluminum steel in a continuous casting facility and preventing breakout during drawing, and high aluminum using the mold powder The present invention relates to a continuous casting method of steel.
高アルミニウム鋼を連続鋳造設備で製造する場合、従来に使用されている表１に示すモールドパウダーを使用すると、連続鋳造設備のモールド内でモールドパウダーと高アルミニウム溶鋼中のＡｌが反応し、溶融したモールドパウダーが組成変動して高融点結晶のゲーレナイトを析出し、目的とする初期組成のモールドパウダーの成分と異なる成分に変化する。そのため狙ったモールドパウダーの特性が得られず、この高融点結晶の析出によりモールドと溶鋼間でモールドパウダーの役割である潤滑作用の効果が失われ、モールドと溶鋼間へのモールドパウダーの流入が阻害されることとなり、モールドと溶鋼間で焼きつきが発生する。この結果、連続鋳造片の表面に凹みや割れなどの表面欠陥が発生し、これらの表面欠陥が極限に達すると連続鋳造片の引き抜き時にブレークアウトが発生し生産性向上の阻害となる。 When high aluminum steel is produced in a continuous casting facility, when the mold powder shown in Table 1 used in the past is used, the mold powder and Al in the high aluminum molten steel react and melt in the mold of the continuous casting facility. The composition of the mold powder fluctuates to deposit high-melting crystal gehlenite, which changes to a component different from the component of the mold powder of the initial initial composition. As a result, the characteristics of the target mold powder cannot be obtained, and the precipitation of the high melting point crystal loses the effect of lubrication, which is the role of the mold powder, between the mold and the molten steel, impeding the flow of mold powder between the mold and the molten steel. As a result, seizure occurs between the mold and the molten steel. As a result, surface defects such as dents and cracks occur on the surface of the continuous cast piece, and when these surface defects reach the limit, a breakout occurs when the continuous cast piece is pulled out, which hinders productivity improvement.
鋼の連続鋳造用のモールドパウダーとして１３００℃における粘度が０．５Ｐａ・ｓ以上の高粘度モールドパウダーが開示されている（例えば、特許文献１参照。）。しかし、このモールドパウダーは、Ａｌの含有量の高い高アルミニウム鋼とモールドパウダーとの反応による阻害については全く着目しておらず、上記した高アルミニウム鋼の連続鋳造時の問題を解決できるものでない。 As a mold powder for continuous casting of steel, a high-viscosity mold powder having a viscosity at 1300 ° C. of 0.5 Pa · s or more is disclosed (for example, see Patent Document 1). However, this mold powder does not pay any attention to the inhibition caused by the reaction between the high aluminum steel having a high Al content and the mold powder, and does not solve the above-described problems during continuous casting of the high aluminum steel.
本発明が解決しようとする課題は、高アルミニウム鋼を連続鋳造する際に、モールド内でモールドパウダーと高アルミニウム溶鋼中のＡｌの反応によってモールドパウダーが組成変動して、高融点結晶のゲーレナイトを析出することのないモールドパウダーを提供することであり、モールドと溶鋼間にモールドパウダーを流入させてモールドパウダーの役割である潤滑作用効果を得て、連続鋳造片の表面欠陥の発生を防止し、さらに連続鋳造片の引き抜き時のブレークアウトの発生を抑制することができる高アルミニウム鋼の連続鋳造用のモールドパウダーを提供することである。 The problem to be solved by the present invention is that when high aluminum steel is continuously cast, the composition of the mold powder changes due to the reaction between the mold powder and Al in the high aluminum molten steel, thereby precipitating high melting point crystal gehlenite. In order to provide mold powder that does not occur, the mold powder is allowed to flow between the mold and molten steel to obtain a lubrication effect that is the role of the mold powder, thereby preventing the occurrence of surface defects on the continuous cast piece, It is an object of the present invention to provide a mold powder for continuous casting of high aluminum steel capable of suppressing the occurrence of breakout during drawing of a continuous cast piece.
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Ａｌ≧０．８０％を含有した高アルミニウム鋼の連続鋳造に用いるモールドパウダーで、軟化点が１０５０〜１１５０℃で１３００℃における粘度が１．０Ｐａ・ｓ以上の物性を有し、塩基度のＣａＯ／ＳｉＯ 2 が０．５０未満に調整されており、その化学組成が質量％でＳｉＯ 2 ：４５〜５５％、ＣａＯ：１５〜２５％、ＭｇＯ：≦１０、Ｎａ 2 Ｏ：≦１０、Ｌｉ 2 Ｏ：≦１０、Ｆ：≦１０、Ｔ．Ｃ：≦１５を含有することを特徴とする高アルミニウム鋼の連続鋳造用モールドパウダーである。 The means of the present invention for solving the above problems is a mold powder used for continuous casting of high aluminum steel containing Al ≧ 0.80% by mass% in the invention of claim 1, and has a softening point of 1050 The viscosity at 1150 ° C. at 1300 ° C. has a physical property of 1.0 Pa · s or more, the basicity CaO / SiO 2 is adjusted to less than 0.50, and the chemical composition is SiO 2 : 45 to 45 % by mass. 55%, CaO: 15-25%, MgO: ≦ 10, Na 2 O: ≦ 10, Li 2 O: ≦ 10, F: ≦ 10, T.P. C: A mold powder for continuous casting of high aluminum steel characterized by containing ≦ 15.
請求項２の発明では、請求項１の手段の高アルミニウム鋼の連続鋳造用モールドパウダーを用い、質量％でＡｌ≧０．８０％を含有した高アルミニウム鋼の連続鋳造設備で鋳造し、鋳片表面欠陥を低減し、かつ、鋳造引き抜き時のブレークアウトの発生を防止することを特徴とする高アルミニウム鋼の連続鋳造方法である。 According to a second aspect of the present invention, the high aluminum steel continuous casting mold powder of the means of the first aspect is used and cast in a high aluminum steel continuous casting facility containing Al ≧ 0.80% by mass. A high aluminum steel continuous casting method characterized by reducing surface defects and preventing occurrence of breakout during casting drawing.
本発明のモールドパウダーを用いることにより、良好な表面品質を有するＡｌ≧０．８０％を含有した高アルミニウム鋼の鋳造片を連続鋳造により製造することが可能となり、連続鋳造片の表面欠陥が大幅に減少し、連続鋳造片の引き抜き時のブレークアウトの発生が減少し、得られた連続鋳造片の圧延鋼片の疵手入れ率が大幅に低減できた。 By using the mold powder of the present invention, it becomes possible to produce a cast piece of high aluminum steel containing Al ≧ 0.80% with good surface quality by continuous casting, and the surface defects of the continuous cast piece are greatly increased. As a result, the occurrence of breakout during drawing of the continuous cast pieces was reduced, and the rolling steel piece maintenance rate of the obtained continuous cast pieces could be greatly reduced.
本発明の実施の形態の説明に先立ち、本発明を開発した経緯について説明する。高アルミニウム鋼の連続鋳造においては、連続鋳造のモールド内において下記の反応式（１）に示した反応がモールドパウダー中のＳｉと溶鋼中のＡｌとの間で起こり、モールドパウダー中のＡｌ2Ｏ3が上昇し、ＳｉＯ2が減少する。
（化１）
［Ａｌ］＋ＳｉＯ2→Ａｌ2Ｏ3＋［Ｓｉ］…（１）
Prior to the description of the embodiments of the present invention, the background of the development of the present invention will be described. In continuous casting of high aluminum steel, the reaction shown in the following reaction formula (1) occurs in the continuous casting mold between Si in the mold powder and Al in the molten steel, and Al 2 O in the mold powder. 3 rises and SiO 2 decreases.
(Chemical formula 1)
[Al] + SiO 2 → Al 2 O 3 + [Si] (1)
このＡｌ2Ｏ3とＳｉＯ2の増減によりモールドパウダーの組成は、図１に示すように、高融点結晶のゲーレナイト：Ｃａ2Ａｌ2ＳｉＯ7の組成に変動する。 As shown in FIG. 1, the composition of the mold powder changes to the composition of high melting point gehlenite: Ca 2 Al 2 SiO 7 due to the increase / decrease in Al 2 O 3 and SiO 2 .
発明者らは、このような高アルミニウム鋼の連続鋳造においては、この高融点結晶の析出により、上記に記載したように、モールドパウダーはモールドと溶鋼間に潤滑が阻害され、モールドパウダーの役割である潤滑作用の効果が失われ、鋳片の表面に凹みや割れなどの欠陥が発生し、その欠陥が極限に達すると究極には連続鋳造片の引き抜き時にブレークアウトが発生することを見出し、そこで、鋭意考究して、塩基度のＣａＯ／ＳｉＯ2を０．５０未満に調整することにより、反応式（１）の反応が起こっても、図１の如く高融点結晶のゲーレナイトを析出させないことを見出し、本発明を得たものである。また、モールドパウダーの軟化点（凝固温度）を１１５０〜１２５０℃からより低い１０５０℃以上で１１５０℃未満に下げることにより、モールドパウダーの溶融性を上げたものである。これらのゲーレナイトを析出させないこととモールドパウダーの溶融性を上げたことの２点を有するモールドパウダーを使用して、質量％でＡｌ≧０．８０％を含有した高アルミニウム鋼の連続鋳造設備で鋳造すると、鋳片の表面欠陥を防止し、さらに、引き抜き時のブレークアウトの発生を抑制することが可能となることを見出した。 In the continuous casting of such high-aluminum steel, the inventors have prevented the mold powder from being lubricated between the mold and the molten steel as described above due to the precipitation of the high-melting-point crystals. When the effect of a certain lubricating action is lost, defects such as dents and cracks occur on the surface of the slab, and when the defects reach the limit, a breakout occurs when the continuous cast piece is pulled out. By intensive study and adjusting the basic CaO / SiO 2 to less than 0.50, even if the reaction of the reaction formula (1) occurs, the high melting point crystal gehlenite is not precipitated as shown in FIG. The title and the present invention are obtained. Moreover, the meltability of the mold powder is increased by lowering the softening point (solidification temperature) of the mold powder from 1150 to 1250 ° C. to a lower temperature of 1050 ° C. or higher and lower than 1150 ° C. Casting with high aluminum steel continuous casting equipment containing Al ≧ 0.80% by mass, using mold powder which has two points of not precipitating these gehlenite and improving meltability of mold powder Then, it discovered that it became possible to prevent the surface defect of a slab and to suppress generation | occurrence | production of the breakout at the time of drawing | extracting.
以下に本発明を実施するための最良の形態について説明する。電気炉により溶製して得た本発明に係るモールドパウダーが適用される高アルミニウム鋼と比較鋼の化学組成をそれぞれ本発明例及び、比較例として示す。表２におけるこれらの鋼の化学組成は、Ｆｅ及び不可避不純物以外の化学組成で示している。なお、表２の本発明例のＮｏ．１は高アルミニウム鋼であるＪＩＳ Ｇ ４２０２で規格するＳＡＣＭ６４５であるアルミニウムクロムモリブデン鋼であり、Ｎｏ．２は同じく高アルミニウム鋼ではあるがＭｏを意図的に添加していない鋼である。Ｎｏ．３は比較鋼として低アルミニウム鋼の例としてＪＩＳ Ｇ ４０５３で規格するＳＣＭ４４０であるクロムモリブデン鋼である。 The best mode for carrying out the present invention will be described below. The chemical compositions of high aluminum steel and comparative steel to which the mold powder according to the present invention obtained by melting with an electric furnace is applied are shown as an example of the present invention and a comparative example, respectively. The chemical compositions of these steels in Table 2 are shown as chemical compositions other than Fe and inevitable impurities. In Table 2, No. of the present invention example. No. 1 is an aluminum chrome molybdenum steel which is SACM645 standardized by JIS G 4202 which is a high aluminum steel. 2 is steel which is also high aluminum steel but does not intentionally add Mo. No. 3 is chromium molybdenum steel which is SCM440 which is standardized by JIS G 4053 as an example of low aluminum steel as a comparative steel.
これらの表２に示す化学組成の溶鋼をそれぞれ表３に示す組成と物性を有する本発明例のモールドパウダーと従来のモールドパウダーと低アルミニウム鋼で使用するモールドパウダーとを比較として用い、鋳込み速度０．４６ｍ／ｍｉｎの条件下で、断面が３８０ｍｍ×４９０ｍｍの鋳片を連続鋳造により製造した。 The molten steel having the chemical composition shown in Table 2 was compared with the mold powder of the present invention example having the composition and physical properties shown in Table 3, the mold powder used in the conventional mold powder and the low aluminum steel, and the casting speed was 0. A slab having a cross section of 380 mm × 490 mm was produced by continuous casting under the condition of .46 m / min.
上記の条件下で連続鋳造により高アルミニウム鋼および低アルミニウム鋼からなる鋳片を製造した場合の、本発明に係るモールドパウダーを適用した本発明例及び比較例並びに従来のモールドパウダーを適用した本発明例及び比較例のそれぞれにおける鋳片表面の疵発生率並びにこれらの鋳片を圧延して得た中間製品の疵手入れ率を表４に示す。 Example of the present invention and comparative example to which the mold powder according to the present invention is applied, and the present invention to which the conventional mold powder is applied when a slab made of high aluminum steel and low aluminum steel is manufactured by continuous casting under the above-mentioned conditions Table 4 shows the rate of occurrence of wrinkles on the surface of the slab in each of the examples and comparative examples, and the rate of maintenance of intermediate products obtained by rolling these slabs.
表４に見られるように、鋼種Ｎｏ．１の高アルミニウム鋼であるＪＩＳ Ｇ ４２０２で規格するＳＡＣＭ６４５は従来のモールドパウダーにより連続鋳造した際に見られた鋳片の表面の凹みと割れなどの欠陥は３８％であったが、本発明のモールドパウダーにより連続鋳造した鋳片の表面の凹みと割れなどの欠陥は３％にまで低減し、この鋳片を圧延して得た中間製品における疵手入れ率は、従来のモールドパウダーによるものでは８２％であったが、それが本発明に係るモールドパウダーによるものでは２８％に低減した。同じく高アルミニウム鋼である鋼種Ｎｏ．２についても従来のモールドパウダーにより連続鋳造した際に見られた鋳片の表面の凹みと割れなどの欠陥は３６％であったが、本発明のモールドパウダーにより連続鋳造した鋳片の表面の凹みと割れなどの欠陥は３％にまで低減し、この鋳片を圧延して得た中間製品における疵手入れ率は、従来のモールドパウダーによるものでは７９％であったが、それが本発明に係るモールドパウダーによるものでは２７％に低減した。低アルミニウム鋼の例としてＪＩＳ Ｇ ４０５３で規格するＳＣＭ４４０であるクロムモリブデン鋼の比較鋼Ｎｏ．３は、従来のモールドパウダーにより連続鋳造した際に見られた鋳片の表面の凹みと割れなどの欠陥は２％であったが、本発明のモールドパウダーにより連続鋳造した鋳片の表面の凹みと割れなどの欠陥は４％に増加し、この鋳片を圧延して得た中間製品における疵手入れ率は、比較のモールドパウダーによるものでは１５％であったが、それが本発明に係るモールドパウダーによるものでは１８％に増加していることから、低アルミニウム鋼における本発明のモールドパウダーによる鋳片表面品質を改善する効果は無い。 As seen in Table 4, the steel type No. SACM645 standardized by JIS G 4202, which is a high-aluminum steel No. 1, had 38% defects such as dents and cracks on the surface of the slab, which were found when continuously cast with conventional mold powder. Defects such as dents and cracks on the surface of the slab continuously cast with mold powder are reduced to 3%, and the maintenance rate in the intermediate product obtained by rolling this slab is 82 with the conventional mold powder. %, It was reduced to 28% when the mold powder according to the present invention was used. Steel grade No. which is also high aluminum steel. As for No. 2, the defects such as dents and cracks on the surface of the slab, which were found when continuously cast with the conventional mold powder, were 36%, but the dents on the surface of the slab continuously cast with the mold powder of the present invention. Defects such as cracks are reduced to 3%, and the maintenance rate of the intermediate product obtained by rolling this slab was 79% with the conventional mold powder, which is related to the present invention. It was reduced to 27% when using mold powder. As an example of low aluminum steel, a comparative steel No. of chromium molybdenum steel which is SCM440 standardized by JIS G 4053 . No. 3, the defects such as dents and cracks on the surface of the slab, which were found when continuously cast with the conventional mold powder, were 2%, but the dents on the surface of the slab continuously cast with the mold powder of the present invention. Defects such as cracks increased to 4%, and the maintenance rate in the intermediate product obtained by rolling this slab was 15% with the comparative mold powder, which is the mold according to the present invention. Since it is increased to 18% in the case of powder, there is no effect of improving the slab surface quality by the mold powder of the present invention in low aluminum steel.
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| JP2008290087A (en) * | 2007-05-22 | 2008-12-04 | Sanyo Special Steel Co Ltd | Mold powder for continuous casting of high carbon steel |
| JP5219264B2 (en) * | 2008-08-11 | 2013-06-26 | 山陽特殊製鋼株式会社 | Continuous casting method of high Al content steel |
| JP5423719B2 (en) * | 2011-03-31 | 2014-02-19 | 新日鐵住金株式会社 | Steel continuous casting method |
| CN103014221B (en) * | 2012-12-17 | 2015-04-08 | 莱芜钢铁集团有限公司 | Method for producing high-aluminum steel plate blanks |
| JP7284397B2 (en) * | 2019-05-24 | 2023-05-31 | 日本製鉄株式会社 | Mold powder for continuous casting |
| CN112620599B (en) * | 2020-12-29 | 2022-04-08 | 河南通宇冶材集团有限公司 | Ultralow-alkalinity high-vitrification protective slag for bloom medium-high carbon steel and preparation method thereof |
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