1 the application range is different from the situation. The heavy shaft covers are usually applied to heavy load occasions, such as airports, highways, wharfs, two loops, urban expressways, etc. this situation has a common feature, that is, it will be subjected to high load and heavy pressure.
2 materials are different. The material is not the same as that of Heavy Ductile iron manhole cover material must be cast, because only cast iron materials in order to meet the requirements of the strength, and covers the common materials can be used cast iron can also be applied to other materials, such as composites, resin materials, polymer materials etc..
The details of the 3 product are different。 The thickness of the heavy ductile iron shaft cover is much thicker than the general well cover, and the common well cover is much lighter from the weight, and the thickness is much thinner。
The ductile iron manhole cover is a kind of ductile iron product. Nodular graphite cast iron is spheroidizing and inoculating to obtain spherical graphite, which effectively improves the mechanical properties of cast iron, especially improves plasticity and toughness, so as to get higher strength than carbon steel.
The iron carbon alloy nodular cast iron composition containing more than 2% C, industrial iron carbon content is generally in 2。5%--4%, including C, SI, and Mn, S, P and other elements, is the use of iron ores in blast furnace smelting products。 According to the different forms of carbon in the pig iron, it can be divided into iron making, cast iron and spheroidal graphite cast iron。 The precipitated graphite is spheric cast iron。
The splitting effect of spherical graphite on metal matrix is smaller than that of flaky graphite. The strength of cast iron reaches 70 to 90% of the strength of matrix, and its tensile strength reaches 120kgf/mm2, and has good toughness. The chemical composition of ductile iron for removing iron is usually: carbon content 3.6 ~ 3.8%, silicon content 2 to 3%, manganese content, phosphorus and sulfur content not more than 1.5% and proper amount of rare earth and magnesium nodulant.
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