Nodular cast iron manhole cover pig iron is an iron-carbon alloy with a carbon content of more than 2%. Industrial pig iron generally contains 2.5%-4% carbon and contains C, SI, Mn, S, P and other elements. It is made from iron ore. Products smelted in a blast furnace. According to the different forms of carbon in pig iron, it can be divided into steel-making pig iron, cast pig iron and ductile iron.
The graphite precipitated is spherical cast iron. Spherical graphite has a smaller splitting effect on the metal matrix than flake graphite, so that the strength of cast iron can reach 70-90% of the matrix structure strength, the tensile strength can reach 120kgf/mm2, and it has good toughness. The chemical composition of nodular cast iron except iron is usually 3.6-3.8% carbon content, 2.0-3.0% silicon content, no more than 1.5% manganese, phosphorus, and sulfur total, and appropriate amounts of rare earth, magnesium and other nodulizers. 1. The appearance is beautiful, the lines are simple and generous, the surface can be processed as required, and the modern concept is strong.
2. Anti-theft design, anti-theft, safe, useful opening hook, easy to open.
3. High strength, strength and toughness are much higher than cast iron, can be used in rainwater, communications, gas, docks, airports and other large-span and heavy-load environments
ductile iron yin and yang manhole cover specifications are 600*600 square 700*700, square 800*800 square 900*900, square 1000*1000. In general, customers can choose invisible manhole covers of different specifications if they choose to be used in different places.
Precautions for installation of ductile iron yin and yang manhole cover
Matter 1: The size of underground sewage outlets in each city is different. For example, some roads with smaller specifications will have smaller sewage outlets, while those on large sections of roads will be wider. When installing the ductile iron manhole cover, you must measure the size of the sewage outlet in advance. The ductile iron manhole cover classification standard and then choose different sizes of manhole covers according to the actual size, so as to ensure the smooth installation. If the size of the selected invisible manhole cover is not the same as the size of the sewage pipe, the installation will not continue.
Item 2: Before installation, the construction personnel should ensure that the height between the plane of the invisible manhole cover and the surrounding ground should not be greater than 3 cm, otherwise the manhole cover and the ground will be unbalanced during installation. Once unbalanced, then this section of the road will be more prominent, thereby increasing the possibility of theft. Theft is second, because the manhole cover is relatively high, it will also cause inconvenience for pedestrians or vehicles.
Item 3: In order to prevent the ductile iron manhole cover from moving due to various reasons, after installation, the construction personnel need to use some concrete to hold down the edge of the invisible manhole cover. After the invisible manhole cover is fixed, the invisible manhole cover is not easy to move, leading to unnecessary troublesome consequences. At the same time, when installing the invisible manhole cover, the construction personnel must keep the manhole cover facing upwards. This is the correct installation procedure.
Ductile iron square manhole cover is a kind of ductile iron manhole cover and is widely used in municipal administration, gardens, parking lots, highways, docks, power plants, steel mills, airports, residential landscape roads, urban sidewalks, motor vehicles, squares, lawns and flower ponds, etc. Water supply, drainage, sewage, communications, electricity, natural gas and other projects. The main application areas of spherical ink manhole covers: municipal roads, highways, communications, electricity, tap water, communities, schools and other parks. Chongqing Ductile Iron Pipe Chongqing Ductile Iron Manhole Cover Chongqing Composite Manhole Cover
