Product Name Seamless Carton Steel Pipe Grade Q235 = S235 / A53 Grade B / A500 Grade A / STK400 / SS400 / ST422 Q345 = S355JR / A500 Grade B Grade C Q355,45#ï¼?40# Length 5.8~12.0 m or as customized Surface Treatment Prime quality (bared, oiled, color paint, 3LPE, or other anti-corrosive treatment) Inspection With Chemical Composition and Mechanical Properties AnalysisDimensional and Visual Inspection, also with Nondestructive Inspection.