As for primesteeltube company, we would like to divide these flanges according to common or not.
First of all, for thecommon types of steel pipe flange, they are:
Welding neck flanges,
Slip-on flanges,
Socket welding flanges,
Lap joint flanges,
Threaded flanges,
Blind flanges and figure-8 blanks.
In addition, except for the common type, we can seespecial one together:
Orifice flanges
Expander flanges
Spectacle blind flanges
Reducing flanges
Weldoflange / Nipoflange