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13
2023
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03
Introduction to the concept and characteristics of ductile iron
Ductile iron is a high-strength cast iron material. Its comprehensive performance is close to steel and is used for casting parts that are subject to complex stresses and require high strength, toughness, and wear resistance. The so-called iron instead of steel mainly refers to ductile iron. Spheroidal graphite cast iron is a spheroidal graphite obtained through spheroidization and inoculation treatment, which effectively improves the mechanical properties of cast iron, especially plasticity and toughness, thereby obtaining higher strength than carbon steel.
Ductile iron is a high-strength cast iron material. Its comprehensive performance is close to that of steel, and it is used to cast parts with complex stress and high requirements for strength, toughness, and wear resistance. The so-called iron instead of steel mainly refers to ductile iron. Spheroidal graphite cast iron is a spheroidal graphite obtained through spheroidization and inoculation treatment, which effectively improves the mechanical properties of cast iron, especially plasticity and toughness, thereby obtaining higher strength than carbon steel.
Ductile iron castings have been used in almost all major industrial sectors that require high strength, high ductility, high toughness, high wear resistance, heat and mechanical shock resistance, high and low temperature resistance, corrosion resistance, and dimensional stability. Ductile iron has many grades, providing a wide range of mechanical and physical properties. Pearlitic nodular graphite cast iron has the characteristics of high strength, medium toughness and plasticity, high comprehensive performance, good wear resistance and vibration damping, and good casting process performance. Its properties can be changed by various heat treatments. It is mainly used for crankshafts, camshafts, connecting shafts, connecting rods, gears, clutch plates, hydraulic cylinders and other parts of various power machines.
However, in ductile iron, these graphite flakes are transformed into tiny spheres through special treatment. This improved sphere gives ductile iron superior physical properties than cast iron and steel. The flaky morphology inside cast iron causes cast iron to have no ductility, but it is this carbon in the spherical microstructure of ductile iron that gives it better ductility and impact resistance. A ferrite matrix can obtain ductility. Therefore, all pressure-bearing components of American Nibco ductile iron are treated with a ferrite annealing cycle. The spherical structure of nodular graphite cast iron can also remove the crack phenomenon of flaky graphite in cast iron. In the micrographs of ductile iron, cracks can be seen traveling towards and terminating at the graphite spheres. In the ductile iron industry, these graphite spheres are called 'crack terminators' because of their ability to prevent fracture.
Ductile iron has high strength and good tensile properties, and the yield strength of ductile iron. Ductile iron has good corrosion resistance and oxidation resistance because ductile iron contains a spherical graphite microstructure, which is very good in terms of vibration damping. Moreover, it has low cost and high casting efficiency. Good physical properties, good ductility and impact resistance. There are many points to pay attention to when using it, so as to reduce the content of manganese, phosphorus and sulfur. When processing, a spheroidizing agent should be added to the molten iron.
Ductile iron is widely used and has the advantages of high strength, good toughness, and strong wear resistance. For example, crankshafts and camshafts of automobiles and tractors require ductile iron. In addition, it is suitable for storage and transportation containers for highly radioactive objects. The corrosion resistance and oxidation resistance of spherical graphite cast iron are higher than those of cast steel. Since the spherical graphite microstructure of nodular graphite cast iron is superior to cast steel in reducing vibration capacity, it is more conducive to reducing stress. An important reason for choosing it is that the cost is lower than that of cast steel. Low cost makes this material more popular, more efficient, and less processing cost.
Ductile iron
Shandong Gongchen Machinery Technology Co., Ltd.
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Website:www.shandonggongchen.com Gongchen.China Valve Castings.China
Address: Mucun Town, Fangzi District, Weifang City, Shandong Province
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