ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Viscosity and Crystallization Behavior of F-free Mold Flux for Casting Medium Carbon Steels
Lejun ZhouWanlin WangKechao Zhou
Author information
JOURNALS OPEN ACCESS FULL-TEXT HTML

2015 Volume 55 Issue 9 Pages 1916-1924

Details
Abstract

Viscosity and crystallization are essential properties to characterize the lubrication and heat transfer performances of mold flux. Therefore, in this paper, the viscosity and crystallization behaviors of conventional F-containing commercial mold flux and newly designed F-free mold fluxes were investigated by using rotating cylinder method and Single/Double Hot Thermocouple Technique (SHTT/DHTT). Results shows that the viscosities of designed F-free mold fluxes are close to the F-containing mold flux; and the crystallization temperatures of F-free mold fluxes increases with the increase of basicity and Na2O/Li2O content; while it decreases with the increase of cooling rate and the addition of B2O3. The final steady state structure of F-free mold fluxes during the DHTT tests shows it is composed of a major crystalline and a thin liquid layer (5.42–7.2%) without glass phase. The results of XRD indicate that the main crystalline phases formed in designed F-free mold fluxes were calcium borosilicate (Ca11Si4B2O22) and calcium magnesium silicate (Ca14Mg2(SiO4)8. Through the comprehensive comparison, the designed F-free mold fluxes flux Sample E (Basicity 1.15, Na2O 7.92, Li2O 1.97 and B2O3 5.98) has the closest performances to the benchmark conventional mold flux Sample A.

Information related to the author
© 2015 by The Iron and Steel Institute of Japan
Previous article Next article
feedback
Top