ERW yeeb nkab kev xav tau Kev cai rau kev thauj cov roj thiab roj Rau cov dej tsis tshua muaj siab conveying Khoom siv Gr.b Gr.b yeeb nkab lub cev txoj kab uas hla D<508mm, ± 0.75%; D≥508mm, ± 0.75% D≤168.3, ± 1.0%; 168.3<D≤508, ± 0.75%; Phab ntsa thickness D<508mm, + 15.0%, -12.5%; D≥508mm, +17.5%, -10% ...
Nyeem ntxiv