Steel Weld-neck Flange, customized made with stainless steel,alloy steel,carbon steel etc. Steel Weld-neck FlangeSimple SpecificationsA flange is an external or internal rib, or rim (lip), for strength, as the flange of an iron beam or I-beam (or a T-beam); or for a flange of a train wheel; or for attachment to another object, as the flange on the end of a pipe, steam cylinder, etc., or on the ...