steel plate flange Standard: ANSI B16.5, B16.47 / API 605,6A,6B / ... ,PN40 / GOST 128202.) Material: Carbon steel flange-ASTM A105,A350,LF2,LF3,Q235, Stainless steel flange- 316,304,304L,316L,3.) Type ... : Welding Neck, Slip-On, Blind, Plate, Thread, Socket Welding , Long Welding Neck, Lap Joint ...