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Comprehensive Study of CaO–SiO 2 ‐Based MgO/Li 2 O‐Modified Mold Flux System for the Casting of Peritectic Steels
Author(s) -
Zhai Bingyu,
Zhang Lei,
Wang Wanlin
Publication year - 2020
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.202000204
Subject(s) - materials science , mold , casting , heat flux , lubrication , heat transfer , flux (metallurgy) , crystallization , viscosity , metallurgy , steel casting , solidus , melting point , continuous casting , composite material , thermodynamics , alloy , physics
It is a challenge to produce peritectic steels through compact strip production (CSP) technology, due to the large volume shrinkage during the initial solidification of peritectic steels and dramatic thermodynamics variation caused by the significant improvement of casting speed. Herein, two mold fluxes are developed to meet the demands for producing peritectic steels by CSP technology. The results show that the developed mold flux MF‐2 achieves the balance between the heat transfer control and mold lubrication, by increasing the CaO/SiO 2 ratio to a particular point at 1.25 and the addition of Li 2 O content. The oxides of CaO and Li 2 O act as network breakers that will provide more O 2− ions to depolymerize the original silicate structure, which in turn promote the mold flux crystallization capability and an effective heat transfer control. Meanwhile, the system viscosity of MF‐2 is lowered; also a good flow fluidity and break temperature are achieved to guarantee an appropriate mold lubrication behavior. In addition, the further addition of Li 2 O could lower the melting temperature to ensure a certain thickness of liquid layer as well. Therefore, MF‐2 shows the best overall performance and could be applied to industrial operations.