Advantages of cast -iron cover covers with spherical graphite compared to other types 

Advantages of cast -iron cover covers with spherical graphite compared to other types

one 、 advantages of mechanical properties

1. High strength and plasticity:

The tensile strength (≥420 MPa) and the fluidity limit (≥300 MPa) significantly exceed the indicators of ordinary cast iron, approaching the level of low -carbon steel. Extension ≥7% provides resistance to deformation even with loads of more than 36 tons.

2. Vibration stability:

The spherical structure of the graphite absorbs vibration energy, reducing the noise from the movement of transport, which is absent from ordinary cast iron and composite materials.

Two 、 corrosion resistance and service life

1. Corrosion resistance:

The service life is 2 times higher than that of ordinary cast iron, and 5 times higher than that of steel. Composite lids quickly degrade under the influence of chemicals and temperature changes.

2. Protection against oxidation and chemicals:

The surface processing with bituminous varnish increases resistance, unlike conventional cast iron. Stainless steel is more expensive in production.

Three 、 Functional features

1. Protection against theft:

The design with U-shaped grooves and nylon locks provides high safety. Built -in anti -trimming nets prevent accidents.

2. Anti -slip and fixation:

Rommboid ledges and anchor bolts prevent displacement. Light composite lids are easily washed off with water.

Four 、 Economic and application spheres

1. Economic efficiency:

The long service life and low service costs compensate for the initial cost. Production is 30% cheaper than cast steel.

2. Universality:

It is used on highways, in communal networks and high load zones. Composite analogues are suitable only for pedestrian zones.

Five 、 environmental friendliness

Environmental friendliness:

Complete processing of the material. Composite analogues pollute the environment due to the complexity of disposal.）

Conclusion

Cast iron lids with spherical graphite remain the best choice for urban infrastructure due to complex advantages. The development of "smart" technologies and environmentally friendly production will expand their use.