... 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 ... steel pipes: 1) Material: 304, 3162) OD:1mm-219mm3) Thickness: SCH10, SCH20, SCH40, SCH80, SCH1604) Standard: ASTM, JIS, DIN stainless seamless steel ...