What are the factors affecting melting in foundry production?

Interference factors in casting melting, generally not the so-called harmful factors, but refers to the normal process of casting production to play a negative impact on the factors. So, what are the interference factors in casting melting?

1, alloying elements. In the casting production, in order to improve the performance of the casting usually deliberately add certain alloying elements, such as manganese, niobium, chromium, molybdenum, vanadium, boron, titanium and so on. These alloying elements are very strong carbide-forming elements, easy to segregate in the casting of the last solidified parts, especially in the grain boundaries out of the formation of higher concentrations, thus affecting the mechanical properties of the casting.

2, casting pig iron in the interference elements. In the melting process, although cast pig iron containing phosphorus, sulfur and other harmful elements and other interfering elements can be partially removed, but a variety of harmful elements and interfering elements will still have a part of the retention. If the content of interfering elements exceeds a certain control amount, it will affect the performance of the material. Therefore, in the manufacture of high-quality cast iron parts, raw pig iron in the content of harmful elements and interfering elements must be strictly controlled.

3, mixed in the furnace charge contaminants. With the pursuit of casting quality, the purity of the casting material requirements have been improved, the pollutants in the furnace charge has become a topic that can not be ignored. Therefore, in the casting, to strictly control the chemical composition of the charge, as far as possible to exclude the constraints of external objective factors.