China CS Flanges factory Carbon steel flange, that is, the flange plate or end flange connection piece whose body is made of carbon steel. The flanges containing carbon steel are called carbon steel flanges. Common materials are cast carbon steel grades WCB, forgings A105, or Q235B, A3, 10#, #20 steel, 16 manganese, 45 steel, Q345B, etc. Usually to prevent rusty flange surface with electroplated layer (yellow zinc, white zinc, etc.), or brush anti-rust oil and spray anti-rust paint.China CS Flanges factory website:http://www.sxforging.com/cs-flanges/