... 20II,20Mn,304,316L,321 3.standard:HG20592, ASME16.5B, weld neck reducing flange 1.size: 3/8''~160''. 2.material ... 20Mn,304,316L,321 3.standard:HG20592, ASME16.5B, DIN weld neck reducing flangesize3/8''~160''TypeLap-Joint Flange (LJ), Socket ... plate flanges, screwed flanges, blind flanges, reducing flanges, weld neck flanges, socket weld flanges, lap joint flanges, spectacles flanges, ring joint flanges ...