"Casting is a metal formed object obtained by various casting methods, that is, the molten metal is poured into the prepared mold by casting, injection, suction other casting methods, the object with certain shape, size performance is obtained after cooling, polishing other subsequent processing methods."

Casting has been widely used in hardware the whole mechanical electronic industry, its use is becoming a growing trend. Specifically used in construction, hardware, equipment, engineering machinery other large-scale machinery, machine tools, ships, aerospace, automobiles, locomotives, electronics, computers, electrical appliances, lamps other industries, many of which are metal objects that ordinary people contact all day but do understand.

The five major castings refer to the five major series of general carbon steel castings, medium low alloy castings, high manganese steel, Zhongming alloy steel high chromium cast steel (iron) wear-resistant castings, heat-resistant steel stainless steel series castings.

Casting has a long history of application. Cylinder accessories manufacturers use castings some living appliances. Cylinder accessories manufacturers mainly use castings as rough parts of machine parts. Some precision castings can also be directly used as machine parts. Castings account for a large proportion in the manufacturers of cylinder accessories. For example, in tractors, the weight of castings accounts for about 50-70% of the total weight, in agricultural machinery for 40-70%, in machine tools, internal combustion engines for 70-90%. Among all kinds of castings, mechanical castings have the most variety, the most complex shape large amount, accounting for about 60% of the total output of castings. Next are the ingot mould for metallurgy, the pipeline for engineering, some tools in life.

Casting is also closely related to daily life. For example, the door handles, door locks, radiators, water pipes, iron pots, gas racks, irons, etc. which are often used are all castings.