The tubes are phosphated after bright annealed heat treatment,
wit bright black colour for the surface, and good property of antirust
EN10305-1 NBK, with the steel grade of E235 E355
Production process:
DIN series tubes, cold drawn and bright annealed precision seamless steel tube is used as the tube to be phosphated. The phosphorization is realized with the imported chemical fluid to form a black film. The antirust oil is absorbed by means of the micropore on the film to prevent the tubes from getting rust.
Main Features:
Bright black color is homogeneously distributed on the tube surface. The tube has good property of antirust.
Main Application:
Phosphated hydraulic tube is mainly used in hydraulic system.
Produced by cold drawing and cold rolling method.
