Characteristics of ductile iron manhole covers

Good toughness. The impact value is similar to that of medium carbon steel and more than 10 times that of gray iron material.

Good toughness. The impact value is similar to that of medium carbon steel and more than 10 times that of gray iron material.

Strong corrosion resistance. In the water spray corrosion test, the corrosion amount in 90 days is only 1/40 of that of steel pipes and 1/10 of that of gray iron pipes. The service life is 2 times that of gray iron pipes and 5 times that of ordinary steel pipes.

Good plasticity. The elongation is ≥7%, which is similar to high carbon steel, while the elongation of gray iron materials is zero.

high strength. The tensile strength ób≥420MPa and the yield strength ós≥300MPa are the same as low carbon steel and three times that of gray iron.

Due to the spheroidal graphite microstructure of ductile iron, ductile iron is superior to cast steel in terms of attenuating vibration, so it is more conducive to reducing stress. An important reason for choosing ductile iron is that the cost of ductile iron is lower than that of cast steel. The low cost of ductile iron makes this material more popular, allows for more efficient casting, and reduces the machining costs of ductile iron.

The strength of ductile iron is comparable to that of cast steel. Ductile iron has a higher yield strength, with a minimum yield strength of 40k, while the yield strength of cast steel is only 36k. In most municipal applications, such as water, salt water, steam, etc., the corrosion resistance and oxidation resistance of ductile iron exceed that of cast steel.