Cast Iron Pipes
Property
Cast iron is composed of iron and a certain percentage of carbon content. Cast iron piping material is considered grey cast iron, which obtained from foundry pig. has low melting point, good machinability.
Properties
| Composition | Exists as a metal matrix containing a proportion of free (uncombined) carbon. The carbon content of Cast Iron ranges from about 2% to 4.5%.
Further amounts of carbon can either form Iron Carbide, [Fe3C], which is hard and brittle, or Graphite, which is almost pure carbon and is soft and has little strength. |
| Elasticity | Cast iron has an eleasticity comparable to that of spring steel.
The elasticity is stable over time and is retained up to relatively high temperatures. Cast iron has no permanent deformation. |
| Excellent resistance to corrosion | Cast iron has an excellent resistance to corrosion over a wide range of operating environments. Initially the surface will slightly rust but then the rusting is practically arrested at the carbon lamellae.
The corrosion resistance of cast iron is much better than that of steel. |
| Classification and size | Hubless cast iron soil pipe and fittings has only one class or thickness. Size ranges from 3.5-23.5cm.
Hub and spigot pipe and fitting has 2 classes; i.e. Service (SV) and Extra Heavy (XH). Both have different outside diameter and wall thickness. They are available in 4.7-35.25cm sizes. |
| Acoustical benefit | More effective in reducing plumbing noise than substitute materials |
| Density | 7870 kg/m³ |
| Modulus of Elasticity | 193.053 GPa |
| Thermal Expansion Coefficient | 1.180 × 10-5 /K |
| Compressive Strength | 600 – 1200 MPa |
| Tensile Strength | 150 – 400 MPa |
| Heat Capacity | 449 J/kg-K |
| Thermal Conductivity | 80.2 W/m-K |