I believe you are not unfamiliar with nodular cast iron manhole covers, you can see it everywhere in the street; but do you know what the grade of nodular cast iron manhole covers is? It doesn't matter if we don't know. Let's let Shandong Ductile Iron Well Cover explain it to us.
There are many kinds of well covers, such as single-layer, double-layer, cast iron well covers, nodular cast iron well covers, composite well covers, cement concrete well covers and so on. Among them, nodular cast iron well covers are widely used.
Commonly used nodular cast iron well cover grade mark setting occasions:
The first category: (the lowest choice of A15 type): green belts, sidewalks and other areas to prevent flexible vehicles from entering.
The second category: (the lowest choice of B125 type): sidewalks, non-motor vehicles, car parking and underground parking.
The third category: (the lowest choice of C250 type): residential areas, back streets, cold lanes, only light motor vehicles or small cars driving areas, the way to both sides of the curb stone within 0.5m.
The fourth category: (the lowest choice of D400 type): urban backbone roads, highways, highways and other areas.
Well covers are generally divided into circular and square, in urban road administration, generally used circular, because the circular well covers are not easy to tilt, can better protect the safety of pedestrians and vehicles.
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