Synopsis of Process Routing: DIN highly accurate, finishing rolled and bright seamless steel pipe is used as the pipe to be galvanized. The inner and outer walls of pipe are cold galvanized, and/or inactivated with military green after galvanizing. The caps are used to cover two ends of pipe.　　Main Features: color of pipe: zinc white and color zinc (zinc yellow) and inactivation with military green. The high brightness on the surfaces of inner and outer walls is obtained after galvanizing. A good property of antirust and anticorrosion on inner and outer walls of pipe are achieved.　　Main Application: used in automotive industry, and in the occasion where the high accuracy, brightness and anticorrosion property of the pipe are required.