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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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