... carbon mild steel production hollow sections pipes and tubos galvanizados Square Tubes: O.D. ... ST33, ST37, ASTM A500, ASTM A 53: Gr. A, Gr B, Gr C, Q195, Q215, Q235, Q275, Q295, Q345, ... -900g/m2Main Market Middle east , Africa,North and South American.etcApplication Widely used in construction, bridge ... door, machinery, chemical industry, supermarket goods shelf and so on.Our Popular Size (Hot Sales!) ...