... .Material:A420 WPL6 4.Standard:ANSI B16.9 ProductsCarbon Steel Elbow Materialcarbon steel (seam & seamless)Standard GB/T, HGJ, SHJ, JB ... products include elbows, reducers, tees, flanges, big elbows,socket pipe, concrete pumps and pipes, concrete pipeline, various groud pipes, horizontal tubes, straight ...