Metal before casting solution temperature should be above its melting point, known as the hot metal. No matter which metal or alloy is cast under overheating conditions, it cannot be cast. However, its superheat should not be too large, otherwise it will cause side effects. In general, the temperature at which the metal or alloy is superheated in the furnace should be 150 to 200 ° C or slightly higher than the melting point of the metal or alloy.

When casting gold or silver metal, the increase of metal temperature is beneficial to reduce the amount of gas dissolved; and the metal with too much heat is cast into the mold, the condensation speed is slow, which is beneficial to the release of gas and reduce the defects of the ingot; The ingot mold of the silver ingot is very small, and the cast metal is easy to cool. If the temperature of the molten metal is too low, the ingot is too fast to be melted, and even the ingot having a good shape can not be cast. However, the temperature is too high and there are disadvantages. According to practice, the casting temperature of silver should be 1100 ~ 1200 ° C, and the casting temperature of gold should be 1200 ~ 1300 ° C.

Properly mastering the superheat of the metal not only ensures the smooth operation of the production operation, but more importantly, it can obtain high quality ingots with good surface and internal structure.

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