... . Advanced Roller Extrusion equipment line. 3.CE,ISO JIS Rectangular Tube 1. STANDARD:GB/T3094-2000, GB/T6728-2002, ... vestibule, glass curtain wall.(5).Transportation: automobile manufacture, ship manufacture, container, tricycle, tower crane.6. SPECIFICATION: SQUARE TUBE(MM) THICKNESS ... in this area.We engaged in research square and rectangular steel tube at the beginning of company established, now ...