The heat treatment process of nodular cast iron manhole cover is carried out by heating and cooling of the two methods, the internal organizational structure to change the rules so that there can be cast.
The performance so that the material itself covers corresponding, so as to meet the need of heavy vehicle road, has a very good performance in hardness, toughness, wear resistance, strength, plastic etc。。
The process of each heat treatment process of ductile cast iron manhole covers are heated in solid state under the covers, heating, cooling and heat preservation is made of three steps.
Cast iron production in addition to some of the more suitable chemical composition to control the internal organization, structure and heat treatment can control and improve the microstructure, which can improve the performance of cast iron。
The heat treatment of nodular cast iron is the same as that of steel。 In the heat treatment of nodular cast iron is the production process of steel imitation, but in terms of process parameters due to the presence of graphite, solid metal and chemical composition are different, so that the heat treatment of cast iron has a certain particularity。
No matter what kind of ductile cast iron is made, in the processing must be the first choice to ensure that ductile iron has a large enough strength, because it relates to the safety of pedestrians and vehicles on Municipal roads。 So compared with other covers, the bearing capacity of ductile iron manhole cover is great。
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