Stainless steel pipe, with the characteristics of high strength, good look, saving stainless steel resource of the state, are widely used to the bumpers of highway bridges and crossroads. In the past, zinced pipes and black iron pipes after painting were used to the bumpers of the bridges on the highway. But they could not get through the weathering, the paint fell down within one year. Then the zinced pipes and black iron pipes inside rusted soon and the workers had to maintain again. But the 304 stainless compound carbon steel pipes were proved to be the best one without repairing and low cost. In addition, it is the best material for the bumper and decoration in the station, port, airport and public areas.