Effect of chromium content (0.15%~0.27% ) in hot metal on dephosphorization rate
yield of Cr and Mn
and mechanical properties of steel HRB400 has been tested and studied. It is obtained by production practice that the optimum Cr content in hot metal is 0.18%~0.25% and the suitable slag (Cr
2
O
3
) is 2%
with reasonable controlling slag ingredient (/%:45.84CaO
16.10SiO
2
8.81MgO
1.60Al
2
O
3
3.48P
2
O
5
1.55Cr
2
O
3
13.23TFe
R2.84) the BOF dephosphorization rate of liquid is 80.33% and the yield of Cr is 71.35%
BOF end [Cr
]
is more than 0.13%
the Si and Mn content in steel may decrease respectively 0.02% and 0.03%
it is available to replace partial Si and Mn by residual Cr to decrease the production cost.