grey cast iron manhole covers

  • Cast iron manhole covers

    Cast iron manhole covers

    product presentation :

    Good toughness.The impact value is similar to that of medium carbon steel, which is more than 10 times 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 pipe and 1/10 of that of gray iron pipe.The service life is 2 times of gray iron pipe and 5 times of ordinary steel pipe.
    Good plasticity.Elongation ≥7%, similar to high carbon steel, but gray iron material elongation is zero.
    High strength.The tensile strength ob ≥420MPa and yield strength OS ≥300MPa are the same as low carbon steel and three times as gray iron material.
    Because of its nodular graphite microstructure, ductile iron is better than cast steel in reducing vibration capacity, so it is more beneficial to reduce stress.An important reason for choosing ductile iron is that ductile iron costs less than cast steel.The low cost of ductile iron makes this material more popular, more efficient, and less costly to machine.
    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 and cast steel yield strength of only 36K.Ductile iron is more resistant to corrosion and oxidation than cast steel in most municipal applications such as water, salt water, steam, etc.