... manufacturer of various of steel pipes, lies in the center of Pipes Manufacturer. Yanshan Yutong Steel Pipes Co., Ltd is the ... manufacturer of various of steel pipes, such as semaless steel pipes, stainless steel pipes, spiral steel pipes, casing and so on, Hope ... will give you the reasonal price and good quality product.Seamless steel pipes: 1) Material: 304, 3162) OD:1mm-219mm3) Thickness ...