The main cast iron manhole cover is being applied in the sewers of the city, but the cause of quality problems in what factors?
Because the environmental differences between the north and the south, the South than the common cast iron covers North low weight, but do not think that the more the better.
Cast iron manhole cover of good quality is to see its toughness and hardness. Generally speaking, the higher the hardness, the better the quality. But need to note is a hardness up, its toughness is to catch up, this can be a good iron manhole cover.
The hardness and toughness of this material is the problem, in addition to the quality of the cast iron manhole cover problem lies in the design, this is because the use of cast iron manhole cover size, shape is necessary from the perspective of casting alloy and casting process characteristics to consider the rationality of the design.
Is mainly the size effect and solidification, shrinkage, stress and other issues clearly, to avoid or reduce the segregation, iron manhole cover deformation and crack defects. Finally, the casting process to be reasonable.
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