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Ductile iron is produced by treating the molten low-sulphur base iron with magnesium under closely controlled conditions. The metal characteristics are enhanced by the free graphite in ductile iron being deposited in the spheroidal form or nodular form instead of flaky form as in grey iron. Due to the presence of free graphite in the nodular form, the continuity of metal matrix is at the maximum, leading to the formation of a stronger, tougher ductile material exceeding grey (or cast) iron in strength, in ductility and in impact strength.
| DN (mm) | External Diameter, DE (mm) | Nominal Pipe Wall Thickness, e (mm) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nominal | Limit Deviations | C20 | C25 | C30 | C40 | C50 | C64 | C100 | BSEN 598 (Pressure Pipe) | K7 | K9 | |
| 80 | 98 | +1 / -2.7 | - | - | - | 4.4 | 4.4 | 4.4 | 4.8 | 4.8 | 5.0 | 6.0 |
| 100 | 118 | +1 / -2.8 | - | - | - | 4.4 | 4.4 | 4.4 | 5.5 | 4.8 | 5.0 | 6.0 |
| 125 | 144 | +1 / -2.8 | - | - | - | 4.5 | 4.5 | 4.8 | 6.5 | 4.8 | 5.0 | 6.0 |
| 150 | 170 | +1 / -2.9 | - | - | - | 4.5 | 4.5 | 5.3 | 7.4 | 4.8 | 5.0 | 6.0 |
| 200 | 222 | +1 / -3.0 | - | - | - | 4.7 | 5.4 | 6.5 | 9.2 | 4.9 | 5.0 | 6.3 |
| 250 | 274 | +1 / -3.1 | - | - | - | 5.5 | 6.4 | 7.8 | 11.1 | 5.3 | 5.3 | 6.8 |
| 300 | 326 | +1 / -3.3 | - | - | 5.1 | 6.2 | 7.4 | 8.9 | 12.9 | 5.6 | 5.6 | 7.2 |
| 350 | 378 | +1 / -3.4 | - | 5.1 | 6.3 | 7.1 | 8.4 | 10.2 | 14.8 | 6.0 | 6.0 | 7.7 |
| 400 | 429 | +1 / -3.5 | - | 5.5 | 6.5 | 7.8 | 9.3 | 11.3 | 16.5 | 6.3 | 6.3 | 8.1 |
| 450 | 480 | +1 / -3.6 | - | 6.1 | 6.9 | 8.6 | 10.3 | 12.6 | 18.4 | 6.7 | 6.6 | 8.6 |
| 500 | 532 | +1 / -3.8 | - | 6.5 | 7.5 | 9.3 | 11.2 | 13.7 | 20.2 | 7.0 | 7.0 | 9.0 |
| 600 | 635 | +1 / -4.0 | - | 7.6 | 8.7 | 10.9 | 13.1 | 16.1 | 23.8 | 7.7 | 7.7 | 9.9 |
| 700 | 738 | +1 / -4.3 | 7.3 | 8.8 | 9.9 | 12.4 | 15.0 | 18.5 | 27.5 | 9.6 | 9.0 | 10.8 |
| 750 | 790 | +1 / -4.3 | - | - | - | - | - | - | - | - | 9.7 | 11.3 |
| 800 | 842 | +1 / -4.5 | 8.1 | 9.6 | 11.1 | 14.0 | 16.9 | 21.0 | 10.4 | 10.4 | 11.7 | |
| 900 | 945 | +1 / -4.8 | 8.9 | 10.6 | 12.3 | 15.5 | 18.8 | 23.4 | 11.2 | 11.2 | 12.6 | |
| 1000 | 1048 | +1 / -5.0 | 9.8 | 11.6 | 13.4 | 17.1 | 20.7 | - | - | 12.0 | 12.0 | 13.5 |
| 1100 | 1152 | +1 / -6.0 | 10.6 | 12.6 | 14.7 | 18.7 | 22.7 | - | - | 14.4 | 14.4 | 14.4 |
| 1200 | 1255 | +1 / -5.8 | 11.4 | 13.6 | 15.8 | 20.2 | - | - | - | 15.3 | 15.3 | 15.3 |
| 1400 | 1462 | +1 / -6.6 | 13.1 | 15.7 | 18.2 | - | - | - | - | 17.1 | - | 17.1 |
| 1500 | 1565 | +1 / -7.0 | 13.9 | 16.7 | 19.4 | - | - | - | - | 17.9 | - | 18.0 |
| 1600 | 1668 | +1 / -7.4 | 14.8 | 17.7 | 20.6 | - | - | - | - | 18.9 | - | 18.9 |
| 1800 | 1875 | +1 / -8.2 | 16.4 | 19.7 | 23.0 | - | - | - | - | 20.7 | 20.7 | |
| 2000 | 2082 | +1 / -9.0 | 18.1 | 21.8 | 25.4 | - | - | - | - | 22.5 | - | 22.5 |
| 2200 | 2288 | +1 / -9.8 | 19.8 | 23.8 | - | - | - | - | - | - | - | 24.3 |
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