... ,304,316L,321 3.standard:HG20592, ASME16.5B, weld neck reducing flange 1.size: 3/8''~160''. ... . A403-WP316.A403-WP316L.Applications rangePetroleum, chemical, power, gas, metallurgy, shipbuilding, construction, etcMin Order QuantityAccording to customer' ... flanges, screwed flanges, blind flanges, reducing flanges, weld neck flanges, socket weld flanges, lap joint flanges, spectacles flanges, ring joint ...