weld neck reducing flange 1.size: 3/8''~160''. 2.material:195,Q235,20II,20Mn,304,316L,321 3.standard:HG20592, ASME16.5B, weld neck reducing flange 1.size: 3/8''~160''. 2.material:195,Q235,20II,20Mn,304,316L,321 3.standard:HG20592, ASME16.5B, DIN weld neck reducing flangesize3/8''~160''TypeLap-Joint Flange (LJ), Socket-welded Flange (SW), Slip-on Flange (SO), Welding-Neck Flange (WN), Threaded ...