psis of process routing- Din highly accurate, cold drawn and bright seamless steel tube is used as the tube to be phosphated. Phosphorization is realized with impored chemical fluid to form a black filmThe antirust oil is absorbed by means of the micro on the film to prevent from the rust.Main features :Bright black color is homogeneously distributed on the tube surfaceThe tube has good property of antirustMain Application :Used in hydraulic systemThis tube is our main product for export busines