... -14mm 3.Finish hot dipped galvanized ,electro GI Steel pipe High strength, ornamental stainless steel tubing is a design feature in many high ... manufacturing partner. 1.Material stainless steel ,steel model Q235, Q345, Q195, Q215 ,etc2..specification type Outer Diameter Thickness Round Pipe 32mm - 630mm 2.5mm ... the transportation of oil, natural gas, gas, water and some solid materials, pipes, etc..