What are the advantages of ductile iron manhole covers?

What are the advantages of ductile iron manhole covers?

We are not new to manhole covers, are we? Do you know what the advantages of ductile iron manhole covers are? Yes, as far as our inertia is concerned, the more ubiquitous objects are, the less doubt we will have. But let’s talk about it in detail, we find ourselves as ignorant. Next, let’s take a look at ductile iron manhole covers.

Advantages of using round ductile iron manhole cover:

When using round ductile iron manhole covers, it is important to consider that the length of each diameter of the round manhole cover passing through the center of the circle is the same. In this way, if the manhole cover is rolled up by passing vehicles, its diameter will be slightly wider than the lower manhole opening no matter how it is rolled up, and the manhole cover will not fall into the wellhead. If the square is selected, because the diagonal of the square is obviously good at each side length, when such a well cover is rolled up, it is easy to fall into the well along the diagonal direction of the wellhead, forming a potential safety hazard.

If the wellhead is round or significantly smaller than the well cover, the square well cover will not fall into the well. This involves a problem of maximum utilization and saving of data. The use of the wellhead depends on the size of the wellhead. If it is necessary to install a square well cover with an area much larger than that of the wellhead, then the application and practical value of the data are naturally more useful than that of the round well cover, which not only saves the data of the well cover, but also ensures the safety of the wellhead. In rural areas and cable wells, square is generally used to prevent rainwater and other liquids from entering.

Characteristics of ductile iron well cover:

1. Good endurance. The impact value and medium carbon steel are detailed and accurate, more than 10 times that of gray iron.

2. Strong corrosion resistance. In the water spray corrosion test, the corrosion amount in 90 days is only 1/40 of the steel pipe and 1/10 of the gray iron pipe. The service life is 2 times that of gray iron pipe and 5 times that of ordinary steel pipe.

3. Good plasticity. Elongation ≥ 7/100, similar to that of high carbon steel, while that of gray iron is zero.

4. High strength. The tensile strength ó b ≥ 420MPa, and the yield strength ó s ≥ 300MPa, which are the same as low-carbon steel and three times the gray iron data.

The strength of nodular cast iron is comparable to that of cast steel. Nodular cast iron has higher yield strength, the lowest yield strength is 40k, while the yield strength.