What Is The Casting Principle Of Ductile Iron Casting?

The casting process can be divided into three basic parts, namely casting metal preparation, mold preparation, and casting treatment. Cast metal refers to the metal material used in casting production to cast castings. It is an alloy composed mainly of one metal element and added with other metal or non-metal elements. It is commonly known as casting alloy and mainly includes cast iron, cast steel, and cast non-ferrous alloys.

Metal smelting is not just about simple melting, but also involves the smelting process to ensure that the metal poured into the mold meets the expected requirements in terms of temperature, chemical composition, and purity. For this purpose, various quality control inspections and tests must be conducted during the smelting process, and liquid metal can only be poured after reaching the specified indicators. Sometimes, in order to meet higher requirements, the molten metal also needs to undergo external treatment after being discharged from the furnace, such as desulfurization, vacuum degassing, external refining, inoculation or metamorphism treatment. The commonly used equipment for melting metals includes blast furnaces, electric arc furnaces, induction furnaces, resistance furnaces, reflection furnaces, etc.

Ductile iron casting uses rare earth magnesium alloy as a spheroidizing agent, and the iron furnace is the same as that of gray iron. To ensure good spheroidization effect, it is necessary to control the content of sulfur and phosphorus to a lower level. Meanwhile, considering the temperature loss during incubation, the temperature of molten iron should be slightly higher than that of gray iron.