Flange Pressure-Temperature Ratings for Group Materials
 
  Selection as per ASME B16.5
  DN 15 through DN 600
  Group Materials 2.1 through 2.12
 
  DATA INPUT
  GROUP MATERIALS
     
  DN
mm    
  DESIGN PRESSURE barg    
  DESIGN TEMP  ᵒC    
           
  RESULT
  DN mm    
  OUTSIDE DIAMETER mm    
  No. OF BOLTS      
  WORKING PRESSURE barg    
  ASME CLASS      
           
         
  The application calculates the working pressure and pressure-temperature rating for flanges with rating class designations 150, 300, 400, 600, 900, and 1500 in sizes DN 15 through DN 600 and flanges with rating class designation 2500 in sizes DN 15 through DN 300.
                     
Table 2-2.1 Pressure-Temperature Ratings for Group 2.1 Materials
Nominal
Designation
Forgings
Castings
Plates
18Cr-8Ni
A182 Gr. F304 (1)
A351 Gr. CF3 (2)
A240 Gr. 304 (1)
18Cr-8Ni
A182 Gr. F304H 
A351 Gr. CF8 (1) 
A240 Gr. 304H 
    Notes:                
    (1)  At temperatures over 538°C, use only when the carbon content is 0.04% or higher.  
    (2)  Not to be used over 425°C.   
Table 2-2.2 Pressure-Temperature Ratings for Group 2.2 Materials
Nominal
Designation
Forgings
Castings
Plates
16Cr-12Ni-2Mo 
A182 Gr. F316 (1) 
A351 Gr. CF3M (2) 
A240 Gr. 316 (1) 
A182 Gr. F316H 
A351 Gr. CF8M (1) 
A240 Gr. 316H 
    18Cr-13Ni-3Mo    A182 Gr. F317 (1)    …   A240 Gr. 317 (1)     
    19Cr-10Ni-3Mo    …   A351 Gr. CG8M (3)   …    
    Notes:                
    (1) At temperatures over 538°C, use only when the carbon content is 0.04% or higher.  
    (2)  Not to be used over 455°C.  
    (3)  Not to be used over 538°C.   
    Table 2-2.3 Pressure-Temperature Ratings for Group 2.3 Materials  
    Nominal                
    Designation   Forgings   Castings   Plates    
    16Cr-12Ni--2Mo    A182 Gr. F316L    …   A240 Gr. 316L    
    18Cr-13Ni--3Mo    A182 Gr. F317L   …   …    
    18Cr-8Ni    A182 Gr. F304L (1)   …   A240 Gr. 304L (1)    
    Note:                
    (1) Not to be used over 425°C.   
    Table 2-2.4 Pressure-Temperature Ratings for Group 2.4 Materials  
    Nominal                
    Designation   Forgings   Castings   Plates    
    18Cr-10Ni-Ti    A182 Gr. F321 (1)    …   A240 Gr. 321 (1)    
    18Cr-10Ni-Ti    A182 Gr. F321H (2)  …   A240 Gr. 321H (2)  
    Notes:                
    (1)  Not to be used over 538°C.  
    (2)  At temperatures over 538°C, use only if the material is heat treated by heating to a minimum tem­ perature of 1 095°C.   
    Table 2-2.5 Pressure-Temperature Ratings for Group 2.5 Materials  
    Nominal                
    Designation   Forgings   Castings   Plates    
    18Cr-10Ni-Cb    A182 Gr. F347 (1)    …   A240 Gr. 347 (1)    
    18Cr-10Ni-Cb    A182 Gr. F347H (2)  …   A240 Gr. 347H (2)  
    18Cr-10Ni-Cb    A182 Gr. F348 (1)    …   A240 Gr. 348 (1)    
    18Cr-10Ni-Cb    A182 Gr. F348H (2)    …   A240 Gr. 348H (2)  
                     
    Notes:                
    (1)  Not to be used over 538°C.  
    (2)  At temperatures over 538°C, use only if the material is heat treated by heating to a minimum tem­ perature of 1 095°C.   
    Table 2-2.6 Pressure-Temperature Ratings for Group 2.6 Materials  
    Nominal                
    Designation   Forgings   Castings   Plates    
    23Cr-12Ni    …   …   A240 Gr. 309H    
    Table 2-2.7 Pressure-Temperature Ratings for Group 2.7 Materials  
    Nominal                
    Designation   Forgings   Castings   Plates    
    25Cr-20Ni   A182 Gr. F310 (1), (2)   …   A240 Gr. 310H    
    Notes:                
    (1) At temperatures over 538°C, use only when the carbon content is 0.04% or higher.  
    (2)  Service temperatures of 565°C and above should be used only when assurance is provided that grain size is not finer than ASTM 6.   
    Table 2-2.8 Pressure-Temperature Ratings for Group 2.8 Materials  
    Nominal                
    Designation   Forgings   Castings   Plates    
    20Cr-18Ni-6Mo   A182 Gr. F44   A351 Gr. CK3MCuN   A240 Gr. S31254    
    22Cr-5Ni-3Mo-N   A182 Gr. F51 (1)    …   A240 Gr. S31803 (1)  
    25Cr-7Ni-4Mo-N   A182 Gr. F53 (1)    …   A240 Gr. S32750 (1)   
    24Cr-10Ni-4Mo-V   …   A351 Gr. CE8MN (1)   …    
    25Cr-5Ni-2Mo-3Cu   …   A351 Gr. CD4MCu (1)    …    
    25Cr-7Ni-3.5Mo-W-Cb   …   A351 Gr. CD3MWCuN (1)   …    
    25Cr-7Ni-3.5Mo-N-Cu-W   A182 Gr. F55 (1)    …   A240 Gr. S32760 (1)  
    Note:                
    (1) This steel may become brittle after service at moderately elevated temperatures. Not to be used over 315°C.  
    Table 2-2.9 Pressure-Temperature Ratings for Group 2.9 Materials  
    Nominal                
    Designation   Forgings   Castings   Plates    
    23Cr-12Ni    …   …   A240 Gr. 309S (1)-(3)   
    25Cr-20Ni   …   …   A240 Gr. 310S (1)-(3)  
    Notes:                
    (1)  At temperatures over 538°C, use only when the carbon content is 0.04% or higher.  
    (2) At temperatures above 538°C, use only if the material is solution heat treated to the minimum tem­perature specified in the specification but not lower than 1035°C, and quenching in water or rap­idly cooling by other means.  
    (3)  This material should be used for service temperatures 565°C and above only when assurance is provided that grain size is not finer than ASTM 6.   
    Table 2-2.10 Pressure-Temperature Ratings for Group 2.10 Materials  
    Nominal                
    Designation   Forgings   Castings   Plates    
    25Cr-12Ni   …   A351 Gr. CH8 (1)   …    
    25Cr-12Ni   …   A351 Gr. CH20 (1)    …    
    Note:                
    (1) At temperatures over 538°C, use only when the carbon content is 0.04% or higher.  
    Table 2-2.11 Pressure-Temperature Ratings for Group 2.11 Materials  
    Nominal                
    Designation   Forgings   Castings   Plates    
    18Cr-10Ni-Cb   …   A351 Gr. CF8C (1)    …    
    Note:                
    (1) At temperatures over 538°C, use only when the carbon content is 0.04% or higher.   
    Table 2-2.12 Pressure-Temperature Ratings for Group 2.12 Materials  
    Nominal                
    Designation   Forgings   Castings   Plates    
    25Cr-20Ni    …   A351 Gr. CK20 (1)   …    
    Note:                
    (1) At temperatures over 538°C, use only when the carbon content is 0.04% or higher.