Carbon steel seamless yeeb nkab yog lub hollow cross seem, tsis muaj seams nyob ib ncig ntawm cov hlau ntev. Hlau raj nrog lub hollow cross-section, rau ib tug loj tus naj npawb ntawm cov kav dej conveying kua, xws li kev thauj mus los ntawm cov roj, natural gas, thee gas, dej thiab ib co khoom siv pipeline. Khoom steel xws li steel kav ...
Nyeem ntxiv