Chromite sand casting is a naturally occurring mineral consisting primarily of the oxides of chrome and iron. Its properties enable the material to be used in high duty grey iron and steel foundries as a core and mould making sand. Its high thermal conductivity gives it good chilling properties whilst its low thermal expansion gives rise to good dimensional stability. Its basicity being close to neutral allows the use of a wide range of resin bonding systems and inorganic binders.
Chromite sand casting advantages:
Good thermal conductivity
Good resistance to thermal shock
Excellent resistance to metal penetration or burn-on
Resists slag attack
High dimensional stability
Chromite sand physical-chemical index
| Item | Index |
| Cr2O3 | ≥46.0% |
| SiO2 | ≤1.0% |
| FeO | ≤26.5% |
| CaO | ≤0.30% |
| MgO | ≤10.0% |
| Al2O3 | ≤15.5% |
| P | ≤0.003% |
| S | ≤0.003% |
| Cr/Fe | 1.55:1 |
| Bulk Density | 2.5-3 |
| Color | Black |
| PH | 7-9 |
| The amount of the acid | ≤ 2 ML |
| Percent soil | ≤0.1% |
| Percent Moisture | ≤0.1% |
| The sintered | 1600℃ |
| Percentage of free acid present in the sand | 0 |
| filling density | 2.6g/cm³ |
| sintering point | > 1800°C |
| melting temperature | 2180°C |
| Avaliable sizes | |
| AFS25-35 AFS30-35 AFS35-40 AFS40-45 AFS45-50 AFS45-55 AFS50-55 AFS55-60 AFS60-65 AFS60-70 | |
The chromite sand casting is compatible with all chemical processes of agglomeration of moulds and cores. Currently used large amounts of chromite sand in the foundry industry for the manufacture of moulds and cores. Chromite Sand is applicable to all types of steels and very appropriate for chrome steel, chrome-nickel and manganese steel. Has the advantage over silica sand that is less reactive with manganese oxide, reducing the problems of ignition and metal-mould reactions.
