Based on referential production data of 80 heats of SPHD
SPHE and IF steel
a calculation model for acid soluble aluminium content in molten steel- [Als
]
at end of RH refining deoxidizing by Al is established by using multiple linear regression analysis and the effect of activity of oxygen in liquid
adding aluminium for deoxidation and net circulation time of liquid at end of RH decarbonizing on end [ Als
]
is analyzed. Results show that the RH decarburization end activity of oxygen in liquid and adding aluminium amount for deoxidation are main factors to influence the end [ Als
]
; as after RH decarburization the liquid temperature
activity of oxygen
FeO + MnO content in slag- ( FeO + MnO) and liquid net circulation time are respectively 1 600 °C
2 x 10
-4
15% and 8 min
in order to control the end [ Als
]
0. 02% ~0. 05%
the adding aluminium amount in RH deoxidation p
rocess should be controlled in 0. 86 ~ 1. 53 kg/t.