The choice of chromite sand model is determined by the size of the workpiece

Generally, the suitable particle size of the sand mold used for the modeling of large steel castings is AFS40-45 and the size of the mold sand replaced by medium and small parts is AFS45-50. There are also special circumstances such as: some small water pump industries, considering economic factors, use chromium ore instead of zirconium sand, the chromium ore purchased by these factories requires very fine, AFS50-55, or even AFS60-65, and so on.