Ductile cast iron is a type of cast iron that is melted with elements such as magnesium or cerium to cause the formation of free graphite nodules or spherulites. The name of ductile iron means that this form of cast iron has a certain degree of ductility. The key characteristic of this substance is the graphite structure.
In ductile cast iron, graphite is in the shape of small spherical spheres, as opposed to gray cast iron sizes. The spherical graphite structure suppresses the generation of linear cracks, so it can resist deformation. Like gray cast iron, many grades of ductile iron can be specified to provide engineers with varying degrees of tensile strength and elongation. Various grades can be achieved by adding alloys and heat treatment.
Benefits of SG Iron / Ductile Cast Iron
• Cost:compared with steel castings, ductile iron has lower manufacturing costs.
• Castability:ductile cast iron has a lower casting temperature than steel, so it can provide excellent surface finish and can cast complex shapes in conjunction with changes in cross-section
• Elongation:the elongation rate of some grades of ductile cast iron is higher than 20%/p>
• Machining:ductile cast iron is very easy to process, and the machining allowance can be kept to a minimum
• Tensile strength:with ductile cast iron you get a tensile strength of up to 900N/mm2
• Reduced weight:due to density, machining allowance, and mold capacity, the weight of ductile iron castings will be much lighter than equivalent steel castings.