Cast iron manhole covers are divided into ductile iron manhole covers and gray iron manhole covers, generally speaking, the same weight of ductile iron manhole covers than gray iron manhole cover pressure resistance. The material used for gray iron manhole cover is generally HT200, and the material used for ductile ink manhole cover is generally QT500-7.
The characteristics of spheroidal ink manhole cover:
Good toughness. The impact value is similar to that of medium carbon steel and more than 10 times that of gray iron.
Strong corrosion resistance. Water spray corrosion test, 90 days of corrosion is only 1/40 steel pipe, is 1/10 gray iron pipe. The service life is 2 times that of gray iron pipe and 5 times that of ordinary steel pipe.
Good plasticity. Elongation ≥7%, similar to high carbon steel material, while gray iron material elongation is zero.
High strength. Tensile strength ob ≥420MPa, yield strength os ≥300MPa, and low carbon steel is the same, is three times of gray iron material.
Application: municipal road, highway, communication, power, tap water, community, school and other parks.
Hebei Mingda International Trading Company is a trading company which is specialized in castings, ODM Ductile Iron Manhole Cover forgings and machinery parts.Our products include all kinds of raw castings to be made of ductile iron , grey iron , brass , stainless steel and aluminums, machined castings and forged parts .ODM Ductile Iron Covers To make these parts according to the customers’Custom Iron Casting 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 Iron Casting Manufacturer Custom.Specially for hydrant bodies and valves’Ductile Iron Manhole Cover Manufacturer bodies, we have collected rich experience for these products in the past 16 year’s actual production, Now we are proud of our products with good surface and high quality material. Iron Casting ManufacturerWhatever,we have been trying our best to provide our customers with better quality castings by improving production crafts and more careful quality control.Cast Iron Castings Manufacturer|super blog