Cause Analysis of Nozzle Blocking in Producing Ti-IF Steel by ASP Technology and Process Optimization
ZHANG Lei
Abstract：The submerged nozzle blockages of Ti-IF steel in ASP continuous casting were sampled and analyzed by optical microscopy, scanning electron microscopy and energy spectrum analysis. The results showed that the blockages were made of iron and inclusions which contained calcium aluminates, Al2O3, ZrO2 and RO and so on. The accumulation of high melting Al2O3 and calcium-aluminate on the inner wall of nozzle formed the junction tumors which was the key reason for nozzle clogging. With the increasing of Ti content, the risk of nozzle blocking increased too. By modifying LF process into LF+RH process, optimizing calcium treatment process and controlling[Ti]<0.02%, the castability of molten steel was improved, the ULC Ti-IF steel could be produced at least 8 furnace using one submerged nozzle.
Keywords：Ti-IF steelnozzle blockingblockageAl2O3calcium aluminate
Publication Date：2015-01-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：4( 27-29,34 )