From the life of speaking, iron and cast iron manhole covers from the ditch cover material and strength is not what the absolute difference, but the general cast iron manhole cover is closed, leaving only a small hole above the water, and some even have no holes covers, then cast iron ditch cover. The general will is leaving a lot of air, to facilitate rainwater immersed, this is his biggest difference.
The strength of the ductile iron groove cover is comparable to the strength of the cast steel. The nodular cast iron has a higher yield strength, the yield strength is lowest 40K, and the yield strength of the cast steel is only 36K. In most of the municipal applications, such as water, brine, steam, and so on, the corrosion resistance and oxidation resistance of spheroidal graphite cast iron exceed the cast steel.
再来从形状上看一下 球墨铸铁井盖一般分为圆形和方形，在市区的路政方面，一般采用圆形，因为 圆形的沟盖板不易倾斜，能够较好的保护好行人和车辆的安全。
Again, from the shape, the nodular cast iron covers are generally divided into circular and square ones. Generally, they are circular in the urban road area, because the circular trenches are not easy to tilt, which can better protect the safety of pedestrians and vehicles.
Use the circular, mainly taking into account the circular trench cover through its center of each diameter length is the same, so if the vehicle through the trench cover is rolled up, because no matter how rolling, the diameter will be slightly wider than the wellhead, will not fall to the wellhead to manhole cover.
The iron pot cover plate words are rarely rounded, usually rectangular, and when in use a lot of it is a general, a drain, a layer of long nose, so this is referred to as cast iron drainage pipe it, what I play is convenient rainwater discharge and debris, leading role,
We are filled with enthusiasm and passion towards work and customers, we are willing to use the hard work and you create a better tomorrow!