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Study of a New Mold Flux for Heat‐Resistant Steel Containing Cerium Continuous Casting
Author(s) -
Qi Jie,
Liu Cheng Jun,
Yang Da Peng,
Zhang Chi,
Jiang Mao Fa
Publication year - 2016
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201500259
Subject(s) - materials science , crystallization , mold , continuous casting , slag (welding) , viscosity , casting , smelting , melting temperature , metallurgy , precipitation , cerium , flux (metallurgy) , composite material , thermodynamics , physics , meteorology
New mold fluxes with CaO–Al 2 O 3 –Li 2 O–CeO 2 system are proposed for heat‐resistant steel continuous casting. The fundamental properties are investigated systematically. It is found that the appropriate content of CeO 2 is determined to be ≈10 wt%, the melting temperature did not change much with increasing CeO 2 content, which indicates that the mold fluxes could show steady smelting properties after continuously absorbing inclusions containing cerium in the continuous casting process. After adding CeO 2 , the precipitation of CaO in the crystallization process is restrained, and the crystalline phases are shifted from CaO/LiAlO 2 to CaCeAlO 4 /LiAlO 2 . It is further evidenced that the precipitation of CaCeAlO 4 and LiAlO 2 can be restrained by CeO 2 . CeO 2 shows significantly positive influence in decreasing the viscosity. Above the breaking temperature, the decrease of viscosity is attributed by the cutting off the chain structure of the molten slag from CeO 2 . Below the breaking temperature, it is caused by the effect of CeO 2 on restraining the crystallization process. The optimal content of Li 2 O is 14 wt%, with a content of less than 14 wt%, Li 2 O can reduce the melting temperature and viscosities obviously, but the fluxing action of Li 2 O becomes ineffective when the content of Li 2 O exceeds 14 wt%. The results have great theoretical significance for developing mold fluxes for heat‐resistant steel.