Pouring Temperature-

In general, the higher the pouring temperature, the higher is the fluidity of molten metal because of decreased viscosity. But at higher pouring temperature, the amount of dissolved gases increases significantly. Therefore, the pouring temperature should be kept low to avoid defects due to trapped gases. It is clear that gas solubility and fluidity are two conflicting requirement. The pouring temperature is, however, decided on fluidity consideration alone and the temperature of the molten metal at the time of pouring is so chosen that every corner of the mould cavity is filled before solidification begins.