Calcium treatment technologies for special steel bars and wire rods

Abstract

For the production by medium size bloom, some trials were held, at first on the test bloom CC, next on the proper CC, then the calcium treatment technologies for special steel bars and wire rods was established. The appropriate calcium treatment condition for each steel grade shows various features, because the equilibria of the alumina modification and the calcium sulfide formation by calcium addition are directly affected by the contents of elements in the molten steel concerning these reactions. It was found that these features can be well explained by the thermodynamic data reported recently. © 1996 ISIJ.