Parameters
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mechnical behavior：
| Ductile cast iron pipe | Common ash cast pipe | Steel pipe | ||
| Tensile strength(MPa) | ≥420 | 150--260 | ≥400 | |
| Ductility(%) | <1000（mm） | ≥10 | Neglected | ≥18 |
| >1000（mm） | ≥7 | Neglected | ≥18 | |
| Brinell hardness(HBS) | ≤230 | ≤230 | about 140 | |
| After annealing,the microstructure of ductile cast iron pipes is ferrite and a little pearlite,possessing excellent mechanical properties. | ||||
other performance：
| The hydraulic test pressure of the ductile cast iron pipes is as follows： | |
| Nominal diameter（mm） | Hydraulic test pressure(MPa) |
| 80≤DN≤300 | 5.0 |
| 350≤DN≤600 | 4.0 |
| 700≤DN≤1000 | 3.2 |
| 1100≤DN≤2000 | 2.5 |
Parameters
Parameters
Parameters