ductile cast iron manhole cover/ductile graphite manhole cover/ductile anti-theft manhole cover

Ductile cast iron manhole cover, also known as cast iron manhole cover, ductile graphite manhole cover, ductile graphite anti-theft manhole cover or ductile graphite manhole cover, is a manhole cover made of high-strength cast iron material.

●Features of ductile iron manhole covers:

•   ♣Good toughness: The impact value is similar to that of medium carbon steel and more than 10 times that of gray iron materials.
•   ♣Strong corrosion resistance: In the water spray corrosion test, the corrosion amount in 90days was only 1/40 of that of steel pipes and 1/10 of that of gray iron pipes.
•   ♣Long service life: 2 times that of gray iron pipes and 5 times that of ordinary steel pipes.
•   ♣Good plasticity: elongation ≥7%, similar to high carbon steel, while the elongation of gray iron materials is zero.
•   ♣High strength: The tensile strength reaches 120kgf/mm², which is the same as low carbon steel and three times that of gray iron.
• ●Product categories:
•   ♣Ductile iron manhole covers are generally divided into round and square. In urban road administration, circular manhole covers are generally used because they are less likely to tilt and can better protect the safety of pedestrians and vehicles.

  ♣The length of each diameter of the circular manhole cover through its center is the same, so that even if it is rolled up by a passing vehicle, the manhole cover will not fall into the wellhead. And the square manhole cover's diagonal is significantly longer than each side length, so it is easy to fall into the well diagonally wellhead, causing a safety hazard.

In short, ductile iron manhole covers are widely used in various industries and fields due to their excellent performance.