PROCEDURE FOR OUT-OF-FURNACE TREATMENT OF STEEL Russian patent published in 2011 - IPC C21C7/00 

FIELD: metallurgy.

SUBSTANCE: procedure consists in complete cut off of furnace slag and in forming new high basicity slag with contents of (FeO) less, than 1 %, in primary steel deep deoxidising at its tapping from furnace and in finish steel deoxidising in ladle with aluminium, in vacuumising, in measurement of oxygen activity and sulphur content in steel, in calculation of amount of calcium introduced into steel and in its blowing with argon. Amount of calcium introduced into steel is determined with consideration of specified contents of CaO in non-metallic inclusions, content of sulphur and oxygen activity in steel and contents of CaO and Al₃O₃ in slag before treatment with calcium. Calcium is introduced into metal in form of flux cored wire.

EFFECT: raised repeatability of production of specified composition of non-metallic inclusions and facilitation of stability of metal products properties.

4 cl, 3 tbl