Specification

Clear opening (mm): 600 x 600

Over Base (mm): 690 x 690

Depth (mm): 35

Ductile iron manhole covers are one type of ductile iron products. Ductile iron obtained Spheroidal graphite through ball and bred deal, which effectively improve the mechanical properties of cast iron , especially improve the ductility and toughness , resulting in higher strength than carbon steel . Ductile iron was developed a high-strength cast iron materials in the 1950s. its overall performance is close to steel. Based on its excellent performance ,Ductile iron has been successfully used to cast some of the complex force , strength, toughness, wear require a higher parts. Ductile iron has been behind the rapid development of gray cast iron widely used . The so-called " Replace steel with iron " , mainly referring to ductile iron.In now market,many factories are producing ductile iron manhole covers.

Hebei Mingda International Trading Company is specialized in castings,forgings and machinery parts.
Our products include all kinds of raw castings to be made of ductile iron , grey iron , brass , stainlesssteel and aluminums,
machined castings and forged parts . To make these parts according to thecustomers' drawings ,we have relative suitable production craft and equipments, such as resin sand ,sand mould , hot core boxes , lost-wax , lost foam and so on .