Ductile iron manhole covers and composite plastic manhole covers are two widely used types of manhole covers, with significant differences in material properties, performance, and

The performance differences between ductile iron and ordinary cast iron (represented by gray cast iron, the most widely used type) stem primarily from the morphology of

I. Core Functions and Technical Features 1.Safety Protection Mechanism: Made of high-strength cast iron or steel, it has a load-bearing capacity of over 40 tons,

Ductile iron is a high-strength cast iron material developed in the 1950s. The following is a detailed introduction from aspects such as its composition, manufacturing