Ductile iron is obtained through ball and bred to deal with spherical graphite, effectively improve the mechanical properties of cast iron, especially to improve the ductility and toughness, resulting in higher strength than carbon steel. Ductile iron is the 1950s developed a high-strength cast iron materials, its overall performance is close to steel, is based on its excellent performance, has been successfully used to cast some of the complex force, strength, toughness, wear require a higher parts.
The low carbon content steel making as the presence of free carbon graphite sheet structure is not formed. Carbon is a natural form of iron in the form of free graphite flakes. In ductile iron, which changes into tiny flakes of graphite spheres through special treatment. This makes the ball so that the improved ratio of soft cast iron and steel, compared with more excellent physical properties. This is a spherical microstructure of carbon, with a more soft so good ductility and impact resistance, and the inside of the sheet in the form of cast iron causes no ductility. Get the best ductility through ferrite matrix, so all U.S. NIBCO crumby iron pressure load ferrite components have been processed at the annealing cycle. Ductile internal spherical structure can be eliminated Cracks graphite cast inside a sheet prone. In the microscopic photograph of soft iron, you can see the cracks in the procession after the graphite ball to terminate. In the crumby iron industry, these graphite balls called "crack Terminator" because they have the ability to prevent breakage.
Sometimes, ductile iron is known as "the best of both worlds," metal, meaning that the strength of soft iron with cast steel, cast iron also has excellent corrosion resistance. Compared with the relatively ductile cast iron, which has the absolute advantage in terms of strength. The yield strength of crumby iron is 40k, while does not show the yield strength and ultimate fracture occurs. Strength Ductile Iron - cost ratio is far superior to cast iron.
Strength and strength ductile iron and cast steel cast ductile iron is relatively comparable. Ductile iron has a higher yield strength, yield strength minimum 40k, and the yield strength of steel only 36k. (See 83 comprehensive comparison of the mechanical properties). In most municipal applications, such as: water, salt water, steam, etc., ductile iron corrosion and oxidation resistance are more than steel. Since the microstructure of spheroidal graphite crumby iron, weakening vibration capability, crumby than steel, and therefore more conducive to reducing stress. One important reason is that the choice of crumbyiron cast ductile lower than the cost. Ductile material cost makes this even more popular, casting more efficient, and less soft iron machining costs.
