QT500-7 lockable cast iron manhole cover Manufacturer in China

Our company mainly produces ductile iron manhole cover cover, ductile iron grating, composite manhole cover & grating, sewage grate, sewage well cover and other products, which are suitable for all kinds of municipal roads, residential areas, green belts, factories, workshops, etc. Dock, garage and other water supply and drainage facilities, can also be customized according to customer drawings or requirements. Welcome friends from all walks of life to visit us. to guide business negotiations, I believe that the choice of us is the choice of our win-win tomorrow.

China cast iron manhole cover

Ductile iron manhole covers are made primarily by ductile iron, or called as nodular iron or sg iron. Whether the quality is good or bad depends on the nodularity. Rust-proof asphalt pain is commonly used in casting process; the surface of ductile iron manhole covers is treated by spraying asphalt anti-rust paint.

The features of ductile iron manhole cover:

1. High strength. The tensile strength of ductile iron is more than 420Mpa and the yield strength is more than 300MPa, which is same which is the same with low-carbon steel and three times more than gray iron.

2. Good toughness. Impact value is similar to carbon steel and 10 times than grey iron.

3. Good plasticity. Elongation of ductile is more than 7% which is similar with high-carbon steel, gray iron material and extend rate is zero.

4. Anti-corrosion resistance. The corrosion was only 0.25 times of pipes during ninety days spray corrosion test and 0.1 times of gray iron pipes. The life is 2 times longer than gray iron pipes and 5 times longer than ordinary steel pipe.

In most municipal applications, such as water, salt water, steam, the corrosion resistance and oxidation resistance of cast iron are more than steel. Because of the spherical graphite cast iron microstructure, ductile iron does better than steel in reduced vibration capacity.

ductile Iron well lid

China cast iron manhole cover 

High strength cast iron manhole cover