Type Sand Selection-quartz sand and chromite sand ?
The heat storage coefficient and thermal diffusion rate of chromite sand are much higher than quartz sand. And because quartz sand changes twice at 573 ° C and 970 ° C, the volume expansion rate is very large, affecting the accuracy of the casting. The high temperature resistance of chromite sand and small thermal expansion coefficient is not easy to cause the casting to deform during the solidification process.
Type sand parameter
Sand parameter
| Type sand parameter | bulk density | Heat storage coefficient ratio | Thermal diffusion ratio ratio ratio | Size |
| Quartz sand | 1.43 | 1.0 | 1 | AFS40-45 |
| chromite sand | 2.44 | 2.0 ～ 2.2 | 5-7 | AFS45-50 |
