... line. 3.CE,ISO,ASTM A500,JIS ASTM A500 Galvanized Rectangular Steel Pipe 1. STANDARD:GB/T3094-2000, GB/T6728-2002, ASTM ... . MATERIAL:Q195, Q215, Q235, Q275, Q345, 20#, 45#, Stainless steel, Seamless steel, Alloy steel.3. SURFACE:Bared, Galvanized, Oiled, Color Paint ... experience in this area.We engaged in research square and rectangular steel tube at the beginning of company established, now our ...