Nodular cast iron manhole cover and rainwater cast iron cover have good toughness. The impact value of medium carbon steel is more than 10 times that of gray iron. 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 twice that of gray iron pipe and five times that of ordinary steel pipe.

Nodular cast iron manhole cover Jianhui casting has good plasticity. Elongation ≥ 7%, similar to that of high carbon steel, while the elongation of gray iron material is zero. High strength. The tensile strength ó B ≥ 420MPa and the yield strength ó s ≥ 300mpa are the same as that of low-carbon steel, which is three times that of gray iron. Due to the spheroidal graphite microstructure of nodular cast iron, nodular cast iron is better than cast steel in reducing vibration, so it is more conducive to reducing stress. An important reason for choosing nodular cast iron is that the cost of nodular cast iron is lower than that of cast steel. The low cost of nodular cast iron makes this material more popular, higher casting efficiency and less machining cost of nodular cast iron.

The strength of rain cast iron manhole cover and grate nodular cast iron is comparable to that of cast steel. Nodular cast iron has higher yield strength, which is as low as 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 nodular cast iron are better than that of cast steel. Nodular cast iron manhole cover, rainwater cast iron cover.