Additive for treating resulphurized steel
A cored wire for introducing additive into a bath of liquid steel, of the type comprising a metal sheath surrounding said additive, characterized in that said additive predominantly comprises calcium silicate. A process for manufacturing a resulfurized steel, characterized in that it comprises a step of introducing, into the bath of liquid steel, such a cored wire.
1. A cored wire for introducing additive into a bath of liquid steel, comprising a metal sheath surrounding said additive, wherein said additive comprises at least 85% calcium silicate by weight.
2. The cored wire as claimed in claim 1 , in which said additive comprises a lime (CaO) content ranging between 31% and 44% by weight and a silica (SiO 2 ) content ranging between 56% and 69% by weight.
3. The cored wire as claimed in claim 1 , in which said additive also comprises another metal oxide.
4. The cored wire as claimed in claim 3 , in which the concentration of said other metal oxide in the additive is less than or equal to 2% by weight.
5. The cored wire as claimed in claim 1 , in which said additive also comprises a flux.
6. The cored wire as claimed in claim 5 , in which the concentration of flux in the additive is less than or equal to 10% by weight.
7. The cored wire as claimed in claim 5 , in which said flux is a fluoride.
8. The cored wire of claim 3 , wherein said other metal oxide is selected from the group consisting of FeO, MnO, and MgO.
9. The cored wire of claim 7 , wherein said fluoride is CaF 2 .