elbow, links, different-diameter pipe, steel pipe; Elbow welded plate system, links, reducer, Three other series flange, 18 material, more than 360 versions. ¦µ ¦µ 630mm 18mm- provide seamless elbow. ¦µ 325mm- ¦µ ¦µ 1200mm 2420mm plate system below the elbow and welded flange products.