Profile: Ningbo parfect machinery Co ., ltd specializes in manufacturing all kinds of steel casting,carbon steel casting, alloy steel casting, and ductile iron casting. ,Carbon steel is choose to make investment castings which have strong lade or stress demands to ensure mechanical properties.For stainless steel castings are used in the condition of corrosion.Carbon steel could be divided into low carbon steel(WC≤0.25%),middle carbon steel(WC 0.25%-0.6%) and high carbon steel(WC>0.6%) according to different carbon content.The higher carbon content is,the higher the hardness and strength will be.But the plasticity will be lower.