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Approximate hardness and melting temperature of some common oxides in steels [27].
| Inclusion | Inclusion Stoichiometry | Hardness (kg/mm2) | Melting Temperature, Tm (°C) |
|---|---|---|---|
| Alumina | Al2O3 | 3000 | 2050 |
| Silicate | SiO2 | 1600 | 1720 |
| Calcium aluminates | (CaO)-(Al2O3) | 930 | 1330–1839 |
| Gehlenites | Ca2Al[AlSiO7] | 1200 | 1310–1590 |
| Anorthites | CaAl2Si2O8 | 850 | 1170–1550 |
