What are the ingredients of ductile iron manhole covers? Let's introduce the composition and application of ductile iron manhole covers:

Cast iron is an iron-carbon alloy with a carbon content of more than 2%. The carbon content of industrial pig iron is generally 2.5%-4%, and contains C, SI, Mn, S, P and other elements. It is made of iron ore through ironmaking Goods for blast furnace smelters. According to the different shapes of carbon deposits in cast iron, it can be divided into steelmaking pig iron, foundry pig iron and ductile iron.

The precipitated high-purity graphite is spherical cast iron. The isolation effect of spherical high-purity graphite on metal substrates is smaller than that of block high-purity graphite, so that the compressive strength of cast iron can reach 70-90% of the compressive strength of the substrate mechanism, and the compressive strength can reach 120kgf/mm2, and Has excellent ductility. The composition of ductile iron except iron is generally: carbon content 3.6-3.8%, silicon content 2.0-3.0%, manganese, phosphorus, sulfur total production not more than 1.5%, and appropriate nodularizers such as rare earth and magnesium. 1. The appearance is beautiful and elegant, the lines are simple and elegant, the surface can be processed according to the requirements, and the modern concept is strong.

2. Anti-theft design, anti-theft, easy to open.

3. High toughness, compressive strength and ductility far exceed that of cast iron, and can be used in natural environments with large spans and heavy loads such as precipitation, communications, natural gas, ports, and airports

Item 1: The size of underground sewage outlets in each city is different. For example, the sewage outlets on some smaller roads will be smaller, while the sewage outlets on some large sections of roads will be wider. Some. When installing ductile iron manhole covers, it is necessary to accurately measure the size of the sewage outlet pipe in advance, and then purchase manhole covers of different sizes according to the specific size, so as to ensure smooth installation. If the size of the selected invisible manhole cover is different from that of the sewage pipe, the installation will not last.

Item 2: Before installation, the construction team should ensure that the height-to-width ratio between the plan of the invisible manhole cover and the surrounding ground should not exceed 3 cm, otherwise the manhole cover and the ground will be unbalanced during installation. Once unbalanced, this section of the road will be obviously highlighted, thereby increasing the possibility of theft. Theft is second, because the manhole cover is relatively high, which will cause inconvenience for pedestrians or trouble for vehicles.

Item 3: In order to better prevent the ductile iron manhole cover from moving due to various reasons, after installation, the construction team needs to use some concrete to press the edge of the invisible manhole cover. After the invisible manhole cover is fixed, the invisible manhole cover will not move and cause some unnecessary inconvenience. At the same time, in the case of installing the invisible manhole cover, the construction team must keep the manhole cover facing up, which is the proper installation process.

Ductile iron square manhole cover is a kind of nodular cast iron manhole cover and is widely used in municipal engineering, garden landscape, underground parking lot, road, port, power plant, steel factory, airport, garden landscape pavement, crosswalk in big city, traffic lane , City squares, grasslands and flower beds, etc., power supply, drainage pipes, sewage treatment, communications, electric power engineering, gas and other engineering projects.