Synopsis of Process Routing: DIN highly accurate, cold drawn and bright seamless steel tube is used as the tube to be internally and externally galvanized. The inner and outer wall of tube areelectroplate, and/or passivated with military green after galvanizing. The caps are used to cover two ends of tube to prevent from the dust. .
　　Main Features: the inner and outer walls of tube are galvanized and/or passivated which have remarkable properties of antirust and anticorrosion. The zinc white, color zinc (zinc yellow) and passivation with military green can be realized.Note: the length of tube is not exceeded 3m.
　　Main Features of passivation: High anti corrosive performance, Salt spray testing as per GB/T10125,Testing times for 240 houses,with not rusting.
　　Main Application: used in military industry, automotive and locomotive industries and in the case where the high antirust and anticorrosion for inner and outer tube walls are required.