Carbon steel flanges Carbon steel flanges and end flange connectors are essentially made of carbon steel. Common standards include ASTM A694, ASTM A350, ASTM A105N (SA105N), MSS SP-44, DIN 2533. The pressure ratings available are from Class 150 to Class 2500. Flanges made from carbon steel contain between 0.05% and 2.1% carbon by weight in … Continue reading Carbon Steel Flanges