Development of Fluoride-Free Mold Fluxes for Medium Carbon Steels Continuous Casting
In conventional commercial mold flux,fluorine is usually added into mold flux to adjust its properties; however,it tends to cause serious environment and health problems.In this paper,the melting and heat transfer behaviors of mold fluxes have been studied by using Single Hot Thermocouple Technique(SHTT)and Infrared Emitter Technique(IET).The results show that the melting temperature range of F-free mold flux decreases with the addition of Na2O/Li2O and B2O3 contents; and the heat flux decreases with the increase of basicity and Na2O/Li2O,as well as the decrease of B2O3 contents.The analysis of XRD show that Ca11Si4B2O22 and Ca14Mg2(SiO4)8 are the two main precipitated crystalline phases in F-free mold fluxes,and the Ca11Si4B2O22 is common and stable crystalline phase in the designed F-free mold fluxes system that shows the potential to replace Ca4Si2O7F2 in the conventional F-containing mold fluxes.Besides,through the comprehensive comparison,Sample E(Basicity 1.15,Na2O 7.92,Li2O 1.97 and B2O3 5.98)shows the closest performances with the benchmark conventional commercial mold flux and has the potential to be used for casting medium carbon steels.
F-free mold fluxes medium carbon steel continuous casting melting heat transfer behavior
Lejun ZHOU Wanlin WANG Juan WEI Kechao ZHOU
School of Metallurgy and Environment,Central South University,Changsha 410083,China State Key Laboratory of Power Metallurgy,Central South University,Changsha 410083,China
国际会议
the 6th International Congress on the Science and Technology of Steelmaking,ICS2015(第六届国际炼钢科技大会)
北京
英文
614-617
2015-05-12（万方平台首次上网日期，不代表论文的发表时间）