... Standard:ANSI B16.9 ProductsCarbon Steel Elbow Materialcarbon steel (seam & seamless)Standard GB/T, HGJ, SHJ, JB, ANSI, ANTM, ... include elbows, reducers, tees, flanges, big elbows,socket pipe, concrete pumps and pipes, concrete pipeline, various groud pipes ... , horizontal tubes, straight pipe, cone pipe, bend pipe, rubber ring, cleaning ball, cleaning post with many ...