Explanation

This is a iron carbon silicon alloy, usually produced by foundry. Its carbon content is greater than 2%, usually between 2.5% and 4.5%, and its silicon content is between 0.5% and 3.0%. Generally, it also contains a small amount of manganese (Mn), phosphorus (P), sulfur (S) and other common elements, and various alloy elements can be added as required. According to the main form, shape and formation process of carbon in iron, this kind of iron can be divided into several types, including grey cast iron, nodular cast iron, compacted graphite cast iron, forged cast iron and inner cast iron. In addition, the addition of alloy elements can improve its mechanical and physical properties, such as wear resistance, heat resistance and corrosion resistance. The shape and size of this cast iron can be designed with different mold as required to make it close to the shape of the final product. However, they cannot be formed by forging and pressing, and as cast structure and casting defect are difficult to be eliminated by heat treatment, so their mechanical properties are relatively low, especially their toughness is poor, and it is difficult to carry out weld. Therefore, its application range is limited to a certain extent. This kind of cast iron is widely used in parts with complex shapes, such as engine base, box, bearing base, flange plate, etc., as well as mechanical parts with low requirements for plastic performance, such as cylinder liner, crankshaft, gear, etc.

Classification