Ductile manhole cover is a kind of ductile iron product. Nodular graphite is obtained by spheroidization and inoculation treatment, which effectively improves the mechanical properties of cast iron, especially the plasticity and toughness, so as to obtain higher strength than carbon steel.

This is a high-strength and durable drainage ditch cover plate, widely used in places that require load-bearing and drainage such as roads, municipal and industrial areas.