There are various pressure classes such as class 150, 300, up to 2500, and PN6 to PN64. A105 flanges of class 300 and below do not require heat treatment, but high pressure class can be heat treated. Flanges with a nominal internal diameter greater than 4 inches are heat treated as annealing, normalizing, normalizing and
There are various pressure classes such as class 150, 300, up to 2500, and PN6 to PN64. A105 flanges of class 300 and below do not require heat treatment, but high pressure class can be heat treated. Flanges with a nominal internal diameter greater than 4 inches are heat treated as annealing, normalizing, normalizing and
There are various pressure classes such as class 150, 300, up to 2500, and PN6 to PN64. A105 flanges of class 300 and below do not require heat treatment, but high pressure class can be heat treated. Flanges with a nominal internal diameter greater than 4 inches are heat treated as annealing, normalizing, normalizing and