The ductile iron manhole cover has high strength and good toughness, so it is 30% lighter than the same type of gray iron manhole cover. The brand of nodular cast iron adopts QT500-7, the temperature of molten iron is not lower than 1456 ℃, during the globular treatment, Coca Cola is selected for adding rare earth magnesium silicon iron alloy and low sulfur content, with three or more globular grades. The mechanical properties of ductile iron specimens are as follows:
3d捕鱼 Tensile strength: 500N / mm
The pressure test failure load of manhole cover exceeds the national industry standard;
The guidelines are as follows:
CJ / t3012-93 inspection standard for cast iron manhole cover
Drainage channel cover and manhole cover of pedestrian road in en124 Lane
The dimension deviation between manhole cover and base conforms to the national standard
3d捕鱼 Cast iron gutter cover size: Light: 25 tons / m2, with car, walking into campus residential park, park, underground parking lot and kitchen.
Heavy duty: 70 tons / m2, less than 20 tons of vehicles pass through the plant area, general roads, ductile iron well cover process features main road side, parking lot and street.
Super heavy: 140 tons / m2, heavy trailer, container forklift, crane, aircraft, etc。
3d捕鱼 1. Hot dip galvanizing surface treatment: with strong rust resistance.
2. Anti theft door design: the trench cover is made of steel grating plate, connected with the frame hinge, anti-theft, safe and easy to open
3. Beautiful product appearance: simple lines, silver appearance, modern concept
4. Mesh with drainage: the leakage area is 83.3%, more than twice that of cast iron.
5. Saving material and Investment: large span, heavy load, lower price than cast iron; and saving cast iron cover due to theft or breakage and replacement cost.
6. Using high strength carbon steel, the steel grid has high strength: its strength and toughness are much higher than that of cast iron, which can be used in large span and heavy load environments such as docks and airports.
7. Product type: it can meet the requirements of different environments, loads, spans and shapes, and can provide dimensions and shapes according to customer requirements.
The above is a detailed introduction to the reasons for choosing Shandong ductile iron manhole cover. For more information, please click http://www.zgcjxdw.com