Steel desulphurating agent and use thereof in the desulphuration of steel

Abstract

The invention relates to a steel desulphurating agent characterised in that it comprises compared with the total weight of the agent: at least 10% of SiO2, at least 10% of C2S, at least 35% of at least one calcium aluminate and optionally a calcium silico-aluminate.

1 . A steel desulphurating agent, characterised in that it comprises, compared with the total weight of the agent:
 at least 10% of SiO 2 ,   at least 10% of C2S,   at least 35% of at least one calcium aluminate and optionally a calcium silico-aluminate, and   lime (CaO).   
   
   
       2 . A steel desulphuration method according to  claim 1  characterised in that the desulphurating agent and the lime are mixed together before being added to the steel. 
   
   
       3 . A steel desulphuration method according to  claim 1  characterised in that the weight ratio of the desulphurating agent to the lime varies from 1/0.5 to 1/2, and is preferably 1/1. 
   
   
       4 . A steel desulphuration method according to  claim 2  characterised in that the weight ratio of the desulphurating agent to the lime varies from 1/0.5 to 1/2, and is preferably 1/1.