How to prevent the manhole cover from bursting!

Ductile manhole covers have the advantages of high pressure resistance, plastic deformation, shock resistance, wear resistance, heat resistance and mechanical impact resistance, heat resistance or low temperature resistance, corrosion resistance and specification reliability. But even so, it is easy to break out under the lower average temperature in winter. Under a certain average temperature, the manhole cover layer has excellent shock resistance, pressure resistance, and excellent tensile strength, so that the layers of the ductile iron manhole cover layer in winter It can also operate well under ultra-low temperature conditions.

Cracks in cast iron manhole cover are inevitable. If the zero point of hydrodynamics is low, the hydrodynamic material of ductile iron oil well cover will not crack in winter. The strategy to reduce the probability of cracks in winter is to choose raw materials with good ultra-low temperature and cold-resistant materials to make ductile iron manhole covers. Moreover, higher technical measures are needed in the production, so that it can work well at low temperature. Due to the high cost of ultra-low temperature and high wear-resistant ductile iron manhole covers, some holes are often found after quenching and tempering treatment, shot blasting and rust removal or mechanical processing during processing, which seriously endangers the quality of the product.