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Rolling steel and welding longitudinally along the length produces electric resistance welding black steel pipe. As a result, the black welded steel pipe's cross section features welded joints. Fencing, scaffolding, line pipes, and other engineering appli
Qingdao Yuming Glass co.,Ltd is Established in 2003, It is a comprehensive enterprise specializing in the production and sales of architectural glass, furniture glass and appliance glass. It has its own glass processing factory, covering an area of 15,000
With the socioeconomic development and the national "One Belt And One Road" initiative, high-speed railway as an efficient mode of transportation has been rapidly developed in recent years. In the construction process, precast box girders are often assemb