중국 튜브 제조업체 ASTM A53 A106 Gr.B API 5L 심리스 블랙 스틸 중공 파이프 탄소 튜브

The Shijiazhuang-Jinan Railway Railway Bridge is 14.032 kilometers long and is a bridge across the Yellow River. It is divided into three parts: the south approach bridge, the main bridge, and the north approach bridge. The main bridge is a dual-purpose bridge for both highway and railway. The steel trusses with a blue main color look like seagulls flapping their wings. The Yellow River Railway Railway Bridge is a dual-purpose bridge for both highway and railway construction for the Shijiazhuan