Flange Pressure-Temperature Ratings for Group Materials
 
  Selection as per ASME B16.5
  NPS 1/2 a NPS 24
  Group Materials 2.1 through 2.12
 
  DATA INPUT
  GROUP MATERIALS
     
  NPS
in.    
  DESIGN PRESSURE psig    
  DESIGN TEMP  F    
           
  RESULT
           
  NPS in.    
  OUTSIDE DIAMETER in.    
  No. OF BOLTS      
  WORKING PRESSURE psig    
  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 NPS 1/2 through NPS 24 and flanges with rating class designation 2500 in sizes NPS 1/2 through NPS 12.
                     
    Table II-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 1000°F, use only when the carbon content is 0.04% or higher.  
    (2)  Not to be used over 800°F.   
    Table II-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 1000°F, use only when the carbon content is 0.04% or higher.  
    (2)  Not to be used over 850°F.  
    (3)  Not to be used over 1000°F.   
    Table II-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 800°F.   
    Table II-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 1000°F.  
    (2)  At temperatures over 1000°F, use only if the material is heat treated by heating to a minimum tem­ perature of 2000°F.   
    Table II-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 1000°F.  
    (2)  At temperatures over 1000°F, use only if the material is heat treated by heating to a minimum tem­ perature of 2000°F.   
    Table II-2-2.6 Pressure-Temperature Ratings for Group 2.6 Materials  
    Nominal                
    Designation   Forgings   Castings   Plates    
    23Cr-12Ni        A240 Gr. 309H    
    Table II-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 1000°F, use only when the carbon content is 0.04% or higher.  
    (2)  Service temperatures of 1050°F and above should be used only when assurance is provided that grain size is not finer than ASTM 6.   
    Table II-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 600°F.  
    Table II-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 1000°F, use only when the carbon content is 0.04% or higher.  
    (2) At temperatures above 1000°F, use only if the material is solution heat treated to the minimum temperature specified in the specification but not lower than 2000°F, and quenching in water or rapidly cooling by other means.  
    (3)  This material should be used for service temperatures 1050°F and above only when assurance is provided that grain size is not finer than ASTM 6.   
    Table II-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 1000°F, use only when the carbon content is 0.04% or higher.  
    Table II-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 1000°F, use only when the carbon content is 0.04% or higher.   
    Table II-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 1000°F, use only when the carbon content is 0.04% or higher.