Introduction of Ductile Iron
Ductile iron is carbon containing iron. We know that iron or steel contains a certain amount of carbon. Why is it called ductile iron? This is because they contain different forms of carbon. Ductile iron contains spherical carbon, so it has more stable properties. Ductile iron is usually produced by melting molten iron or scrap iron at high temperatures and then casting it into a die. After casting is cooled and formed, the surface will assume the shape of carbon, depending on the process, which can appear as sheets. Four types of wormlike, spherical, flocculent, each has its own name, of which spherical is what we call spherical cast iron.
What are the characteristics of ductile iron?
Characteristic 1: Ductile iron has excellent impact resistance and ductility. This is because graphite sheets in ductile iron are specially treated to form very fine carbon elements, which enter into the gap between iron elements and greatly enhance ductile iron. Physical properties are therefore very good shock resistance. We also know that graphite has no ductility, but iron has good ductility. The combination of the two is the perfect inheritance of their respective advantages, so that ductile iron has impact resistance and ductility.
Feature 2: Ductile iron can effectively prevent cracks. In the industry, our image is called the crack terminator. Through a microscope, experts can clearly see the cracks that stop when the cracks enter graphite spheres. This is because graphite spheres have very high stability and very little possibility of cracking.
Characteristic 3: Anti-corrosion. As mentioned above, ductile iron is a kind of graphite element entering the iron gap. As a result, corrosive objects do not corrode iron.
Compared with cast iron, ductile iron has absolute strength advantage. The tensile strength of nodular cast iron is 60k, while that of cast iron is only 31k. The yield strength of nodular cast iron is 40k, while cast iron does not show yield strength and ultimately fracture. The strength-cost ratio of ductile iron is much better than that of cast iron. As far as corrosion resistance is concerned, nodular cast iron is the same as cast iron. Ductile iron has high strength, gray iron has good wear resistance and good vibration absorption. This is why imported vehicles use a large number of high strength gray iron as gears.