... .GRADE:ASTM A182-301,F302,F304/L,F316/L,F321/H,F51, EN10272,1.4301,1.4306,1.4307,1.4541 ... Neck Flange. (WN)Butt Welding Neck Flange.(SW) Socket Welding Flange.(TH) Thread Flange(PJ/SE) Butt Welding Ring Loose Flange.(PJ/PR) Flat Welding Ring Loose Flange.(BL)Blind Flange ... .25-50MpaGRADEASTM A182-F301,F302,F304/L,F316/L,F321/H,F51;EN10272,1.4301,1.4306,1.4307,1.4541 ...