MOLD POWDER AND CONTINUOUS CASTING METHOD FOR HIGH Mn STEEL

To provide mold powder capable of suppressing the compositional change of powder slag even if MnO is not contained and maintaining the high viscosity of the powder slag in the continuous casting of high Mn steel.SOLUTION: Mold powder has a composition comprising SiOand CaO as essential component, in...

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Bibliographische Detailangaben
Hauptverfasser:	NAKATANI ERIKA, OKADA MASANORI
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	CASTING CASTING OF METALS CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES PERFORMING OPERATIONS POWDER METALLURGY TRANSPORTING
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Beschreibung
Zusammenfassung:	To provide mold powder capable of suppressing the compositional change of powder slag even if MnO is not contained and maintaining the high viscosity of the powder slag in the continuous casting of high Mn steel.SOLUTION: Mold powder has a composition comprising SiOand CaO as essential component, in which the mass ratio of the CaO to the SiO(CaO/SiO) is 0.60 to below 1.0, the content of AlOis 12.0 to 25.0 mass%, the total of the contents of LiO, NaO, MgO, BOand F is 3.0 to 15.0 mass%, the content of MnO is 0.5 mass% or lower, and viscosity at 1,300°C is 1.0 to 10 Pa s.SELECTED DRAWING: None 【課題】高Ｍｎ鋼の連続鋳造においてＭｎＯを含有しなくてもパウダースラグの組成変動を抑制し、パウダースラグの高い粘度を維持することができるモールドパウダーを提供すること。【解決手段】モールドパウダーは、ＳｉＯ２とＣａＯを主成分として含み、ＣａＯのＳｉＯ２に対する質量比（ＣａＯ／ＳｉＯ２）は０．６０以上１．０未満であり、Ａｌ２Ｏ３の含有量は１２．０〜２５．０質量％であり、Ｌｉ２Ｏ、Ｎａ２Ｏ、ＭｇＯ、Ｂ２Ｏ３及びＦの含有量の合計は３．０〜１５．０質量％であり、ＭｎＯの含有量は０．５質量％以下であり、１３００℃における粘度が１．０〜１０Ｐａ・ｓである。【選択図】なし