Ferrotitanium and ferrotitanium cored wire are always used for Ti alloying in micro alloy steelmaking

practices and thermodynamics analysis proved that there are Ti loss since the Ti oxidation

and Al in steel could increase the Ti yield. Analyses of 48 heats were taken to test the Ti alloying of 2 different steel grades with 2 alloying ways and different process route- EAF and BOF. Ti yield of all heats was in range of 72. 66% ~ 87. 17%. The yield of steel grade ( steel grade II

0. 05%Ti) with a higher Ti content (79. 84% ~ 84. 66% ) was higher than that with a lower Ti content (steel grade I

0. 02%Ti) (72

66% ~87. 17% ). Ti yield of ferrotitanium alloying was 67. 34% ~72.76%

and lower the tap¬ping steel oxidability could reduce the Ti losses. The Ti yield of ferrotitanium cored wire feeding was 78. 62% ~ 85. 12%

and Ti yield with the combination of ferrotitanium and wire feeding alloying process (83. 49% ~85. 12% ) was higher than that with only wire feeding (78. 62% ~79. 54% ) since the Ti oxidation in top slag after feirotitanium alloying could inhibit the Ti oxidation during the wire feeding process. The Ti in slag could be reduced during the vacuum process

Ti yield of VD process (28. 05% -44. 04% ) was higher than that in the RH process (< 4% ) since it have a better Ti reduction kinetic condition. The only wire feeding on LF refining process plus VD process was the most economical method of the Ti alloying for both steel grades I and H .