Black phosphating tube

Black phosphating tube, High Precision Black Phosphated Seamless Steel Tube, DIN2391, EN10305, Black phosphating Seamless Steel Tube, DIN high precision cold drawn NBK seamless steel tube High precision cold drawn seamless steel tube is used as the tube to be black phosphated, the black phosphated is realized with the imported chemical fluid to form a black protected film, the anti-rust oil is absorbed by the means of the micro pore on the film to prevent from the rust and