inclusions in the high-Si steel welds is therefore smaller.
This can also be confirmed from Figure 12, where
equilibrium inclusion contents are given with respect to
temperature for both steels with two different oxygen
contents. Figure 12(b) indicates that for high-Al steel
weld pool with an oxygen content of 0.002 wt pct, the
nucleation temperature of Al2O3 is found to be 2008 C,
whereas in high-Si steel, SiO2 is found to nucleate at
1596 C (Figure 12(a)). If the oxygen content of the
weld pool increases from 0.002 to 0.004 wt pct, the
nucleation temperature of oxides increases by about
75 C in both steels. In all cases, MnS appears to form at
about 1425 C and the oxygen content in liquid steel is
not found to affect the formation of MnS.