Steel Pipes: Our Pipe manufacture named Sunwen Piping Solutions Co., Ltd is located in Xishan district, Wuxi, China, focus on manufacturing EFW/LSAW pipes of stainless, alloy steel and line pipes, with annual production capacity of 30,000M. Tons of high class welding pipes, including Standard of A358, A312 TP316, 304, 347, A672 CL22, API 5L, Range: 14"- 110" with Wall Thickness 100mm available.