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How Ductile Iron Compares to Cast Iron and Cast Steel
　
| Chemical Analysis |
| Cast Iron ASTM A 126 Class B* |
Ductile Iron ASTM A 395 |
Cast Steel ASTM A 216 WCB |
|
| Iron and Residuals% | 94.0 | 94.5 | 98.1 |
| Carbon% | 3.3 | 3.0 | 0.3 |
| Silicon% | 2.0 | 2.5 | 0.6 |
| Manganese% | 0.7 | 1.0 | |
| * Typical composition, ASTM Standard does not specify materials to this detail. | |||
| Pressure/Temperature Ratings Comparing Cast Iron, Ductile Iron and Cast Steel |
| °F/°C Temperature | ASTM A 126 Cast Iron |
ASTM A 395 *Ductile Iron |
ASTM A 216 WCB Cast Steel |
|
| Class 125 | Class 150 | Class 150 | ||
| 2"-12" | 14"-24" | 2"-24" | 2"-24" | |
| -20°F-100°F | 200 psi | 150 psi | **285 psi | 285 psi |
| 150°F/66°C | 200 psi | 150 psi | 243 psi | |
| 200°F/93°C | 190 psi | 135 psi | 235 psi | 260 psi |
| 250°F/121°C | 175 psi | 125 psi | 225 psi | |
| 300°F/149°C | 165 psi | 110 psi | 215 psi | 230 psi |
| 350°F/177°C | 150 psi | 100 psi | 210 psi | |
| 400°F/204°C | 140 psi | 200 psi | 200 psi | |
| 450°F/232°C | 125 psi | 185 psi | ||
| 500°F/260°C | 170 psi | 170 psi | ||
| 550°F/288°C | 155 psi | |||
| 600°F/316°C | 140 psi | 140 psi | ||
| 650°F/343°C | 125 psi | 126 psi | ||
| * These ratings apply when temperature exceeds 450°F and the valve has 316 SS trim. When ASTM B 584 trim is used, maximum temperature limit is 450°F. ** Engineering Note: Ductile Iron flanges are rated at 250 psi in accordance with ANSI B16.42. |
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