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首页> 外文期刊>ISIJ international >Evolution of Compositions and Properties of CaO–SiO2 Based Mold Flux for Continuous Casting High Mn Steel
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Evolution of Compositions and Properties of CaO–SiO2 Based Mold Flux for Continuous Casting High Mn Steel

机译：高锰钢连铸用CaO-SiO 2 基保护渣的成分和性能演变

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In order to investigate the interfacial reaction phenomena between the continuous casting molten steel with high Mn content and CaO-SiO_(2) based mold flux, a series of laboratory experiments were carried out. Various factors which may affect the composition evolution in mold flux were taken into account to propose a reaction mechanism. Based on the results obtained experimentally, four types of mold flux representing different stages of composition evolution were used to elucidate lubrication and crystallization behaviors of mold flux during the reaction process. The results show that the chemical reaction, 2[Mn] + (SiO_(2)) = [Si] + 2(MnO), is mainly governed by the Mn content in molten steel. The initial (CaO/SiO_(2)) in mold flux has a moderate effect on this reaction. The couple effect of MnO accumulation and SiO_(2) reduction induces a remarkable decline in viscosity and break temperature of mold flux. Crystallization temperature shows a downward trend after the first rise. The formation of Ca_(4)Si_(2)O_(7)F_(2) takes place first in all mold flux samples. The morphology of cuspidine changes from small faceted shape with regular spacing to larger interconnected block, and the number of cuspidine crystals decreases with MnO accumulation and SiO_(2) reduction. In mold fluxes with higher MnO content, the micro tephroite crystals precipitate at lower temperature, while the crystallization of CaF_(2) is suppressed, which results in higher heat flux and thinner solid slag film. The findings in this study provide the evidence of heat transfer deterioration in flux layers during the continuous casting process for high Mn steel.
机译：为了研究高锰含量的连铸钢水与CaO-SiO_（2）基保护渣之间的界面反应现象，进行了一系列的室内实验。考虑了可能影响脱模剂成分演变的各种因素，提出了一种反应机理。根据实验获得的结果，使用四种类型的代表不同组成演变阶段的脱模剂来阐明反应过程中脱模剂的润滑和结晶行为。结果表明，化学反应2 [Mn] +（SiO_（2））= [Si] + 2（MnO）主要受钢液中Mn的影响。助熔剂的初始（CaO / SiO_（2））对该反应有中等影响。 MnO积累和SiO_（2）还原的耦合效应导致粘度和脱模剂的破坏温度显着下降。首次升高后，结晶温度呈现下降趋势。 Ca_（4）Si_（2）O_（7）F_（2）的形成首先在所有铸模助熔剂样品中发生。 cuspidine的形态从具有规则间隔的小刻面形状变为较大的互连块，并且随着MnO的积累和SiO_（2）的减少，cuspidine的晶体数量减少。在具有较高MnO含量的保护渣中，微球铁矿晶体在较低的温度下析出，而CaF_（2）的结晶得到抑制，从而导致较高的热通量和更薄的固体渣膜。这项研究的发现提供了高锰钢连续铸造过程中焊剂层传热恶化的证据。

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